[BPF] Add BTF DebugInfo under BPF target

[yonghong-song]

Summary

This is an alternative implementation for

https://reviews.llvm.org/D53736.

The patch D53736 implemented BTF generation
functionality at lib/CodeGen/AsmPrinter directory.

This patch provided an implementation which
has the same functionality to D53736, but
implemented at lib/Target/BTF directory.

Signed-off-by: Yonghong Song <[e-mail]>

[yonghong-song]

refactor the previous change to separate Debug info changes into
https://reviews.llvm.org/D55755 (for moving related header files into include directory)
and
https://reviews.llvm.org/D55756 (for exposing some private fields as protected)

So this change contains changes only under BPF target.

[echristo]

Thanks so much for the split!

LGTM.

-eric

include/llvm/BinaryFormat/BTF.h

+//===-- llvm/BinaryFormat/BTF.h ---------------------------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+///
+/// \file
+/// This file contains the layout of .BTF and .BTF.ext ELF sections.
+///
+/// The binary layout for .BTF section:
+///   struct Header
+///   Type and Str subsections
+/// The Type subsection is a collection of types with type id starting with 1.
+/// The Str subsection is simply a collection of strings.
+///
+/// The binary layout for .BTF.ext section:
+///   struct ExtHeader
+///   FuncInfo and LineInfo subsections
+/// The FuncInfo subsection is defined as below:
+///   BTFFuncInfo Size
+///   struct SecFuncInfo for ELF section #1
+///   A number of struct BPFFuncInfo for ELF section #1
+///   struct SecFuncInfo for ELF section #2
+///   A number of struct BPFFuncInfo for ELF section #2
+///   ...
+/// The LineInfo subsection is defined as below:
+///   BPFLineInfo Size
+///   struct SecLineInfo for ELF section #1
+///   A number of struct BPFLineInfo for ELF section #1
+///   struct SecLineInfo for ELF section #2
+///   A number of struct BPFLineInfo for ELF section #2
+///   ...
+///
+/// The section formats are also defined at
+///    https://github.com/torvalds/linux/blob/master/include/uapi/linux/btf.h
+///
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_BINARYFORMAT_BTF_H
+#define LLVM_BINARYFORMAT_BTF_H
+
+namespace llvm {
+namespace BTF {
+
+enum : uint32_t { MAGIC = 0xeB9F, VERSION = 1 };
+
+/// Sizes in bytes of various things in the BTF format.
+enum {
+  HeaderSize = 24,
+  ExtHeaderSize = 24,
+  CommonTypeSize = 12,
+  BTFArraySize = 12,
+  BTFEnumSize = 8,
+  BTFMemberSize = 12,
+  BTFParamSize = 8,
+  SecFuncInfoSize = 8,
+  SecLineInfoSize = 8,
+  BPFFuncInfoSize = 8,
+  BPFLineInfoSize = 16
+};
+
+/// The .BTF section header definition.
+struct Header {
+  uint16_t Magic;  ///< Magic value
+  uint8_t Version; ///< Version number
+  uint8_t Flags;   ///< Extra flags
+  uint32_t HdrLen; ///< Length of this header
+
+  /// All offsets are in bytes relative to the end of this header.
+  uint32_t TypeOff; ///< Offset of type section
+  uint32_t TypeLen; ///< Length of type section
+  uint32_t StrOff;  ///< Offset of string section
+  uint32_t StrLen;  ///< Length of string section
+};
+
+enum : uint32_t {
+  MAX_VLEN = 0xffff         ///< Max # of struct/union/enum members or func args
+};
+
+enum TypeKinds : uint8_t {
+#define HANDLE_BTF_KIND(ID, NAME) BTF_KIND_##NAME = ID,
+#include "llvm/BinaryFormat/BTF.def"
+};
+
+/// The BTF common type definition. Different kinds may have
+/// additional information after this structure data.
+struct CommonType {
+  /// Type name offset in the string table.
+  uint32_t NameOff;
+
+  /// "Info" bits arrangement:
+  /// Bits  0-15: vlen (e.g. # of struct's members)
+  /// Bits 16-23: unused
+  /// Bits 24-27: kind (e.g. int, ptr, array...etc)
+  /// Bits 28-30: unused
+  /// Bit     31: kind_flag, currently used by
+  ///             struct, union and fwd
+  uint32_t Info;
+
+  /// "Size" is used by INT, ENUM, STRUCT and UNION.
+  /// "Size" tells the size of the type it is describing.
+  ///
+  /// "Type" is used by PTR, TYPEDEF, VOLATILE, CONST, RESTRICT,
+  /// FUNC and FUNC_PROTO.
+  /// "Type" is a type_id referring to another type.
+  union {
+    uint32_t Size;
+    uint32_t Type;
+  };
+};
+
+// For some specific BTF_KIND, "struct CommonType" is immediately
+// followed by extra data.
+
+// BTF_KIND_INT is followed by a u32 and the following
+// is the 32 bits arrangement:
+// BTF_INT_ENCODING(VAL) : (((VAL) & 0x0f000000) >> 24)
+// BTF_INT_OFFSET(VAL) : (((VAL & 0x00ff0000)) >> 16)
+// BTF_INT_BITS(VAL) : ((VAL) & 0x000000ff)
+
+/// Attributes stored in the INT_ENCODING.
+enum : uint8_t { INT_SIGNED = (1 << 0), INT_CHAR = (1 << 1), INT_BOOL = (1 << 2) };
+
+/// BTF_KIND_ENUM is followed by multiple "struct BTFEnum".
+/// The exact number of btf_enum is stored in the vlen (of the
+/// info in "struct CommonType").
+struct BTFEnum {
+  uint32_t NameOff; ///< Enum name offset in the string table
+  int32_t Val;      ///< Enum member value
+};
+
+/// BTF_KIND_ARRAY is followed by one "struct BTFArray".
+struct BTFArray {
+  uint32_t ElemType;  ///< Element type
+  uint32_t IndexType; ///< Index type
+  uint32_t Nelems;    ///< Number of elements for this array
+};
+
+/// BTF_KIND_STRUCT and BTF_KIND_UNION are followed
+/// by multiple "struct BTFMember".  The exact number
+/// of BTFMember is stored in the vlen (of the info in
+/// "struct CommonType").
+///
+/// If the struct/union contains any bitfield member,
+/// the Offset below represents BitOffset (bits 0 - 23)
+/// and BitFieldSize(bits 24 - 31) with BitFieldSize = 0
+/// for non bitfield members. Otherwise, the Offset
+/// represents the BitOffset.
+struct BTFMember {
+  uint32_t NameOff; ///< Member name offset in the string table
+  uint32_t Type;    ///< Member type
+  uint32_t Offset;  ///< BitOffset or BitFieldSize+BitOffset
+};
+
+/// BTF_KIND_FUNC_PROTO are followed by multiple "struct BTFParam".
+/// The exist number of BTFParam is stored in the vlen (of the info
+/// in "struct CommonType").
+struct BTFParam {
+  uint32_t NameOff;
+  uint32_t Type;
+};
+
+/// The .BTF.ext section header definition.
+struct ExtHeader {
+  uint16_t Magic;
+  uint8_t Version;
+  uint8_t Flags;
+  uint32_t HdrLen;
+
+  uint32_t FuncInfoOff; ///< Offset of func info section
+  uint32_t FuncInfoLen; ///< Length of func info section
+  uint32_t LineInfoOff; ///< Offset of line info section
+  uint32_t LineInfoLen; ///< Length of line info section
+};
+
+/// Specifying one function info.
+struct BPFFuncInfo {
+  uint32_t InsnOffset; ///< Byte offset in the section
+  uint32_t TypeId;     ///< Type id referring to .BTF type section
+};
+
+/// Specifying function info's in one section.
+struct SecFuncInfo {
+  uint32_t SecNameOff;  ///< Section name index in the .BTF string table
+  uint32_t NumFuncInfo; ///< Number of func info's in this section
+};
+
+/// Specifying one line info.
+struct BPFLineInfo {
+  uint32_t InsnOffset;  ///< Byte offset in this section
+  uint32_t FileNameOff; ///< File name index in the .BTF string table
+  uint32_t LineOff;     ///< Line index in the .BTF string table
+  uint32_t LineCol;     ///< Line num: line_col >> 10,
+                        ///  col num: line_col & 0x3ff
+};
+
+/// Specifying line info's in one section.
+struct SecLineInfo {
+  uint32_t SecNameOff;  ///< Section name index in the .BTF string tble
+  uint32_t NumLineInfo; ///< Number of line info's in this section
+};
+
+} // End namespace BTF.
+} // End namespace llvm.
+
+#endif

include/llvm/BinaryFormat/BTF.def

+//===- llvm/BinaryFormat/BTF.def - BTF definitions --------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// Macros for BTF.
+//
+//===----------------------------------------------------------------------===//
+
+#if !defined(HANDLE_BTF_KIND)
+#error "Missing macro definition of HANDLE_BTF_*"
+#endif
+
+HANDLE_BTF_KIND(0, UNKN)
+HANDLE_BTF_KIND(1, INT)
+HANDLE_BTF_KIND(2, PTR)
+HANDLE_BTF_KIND(3, ARRAY)
+HANDLE_BTF_KIND(4, STRUCT)
+HANDLE_BTF_KIND(5, UNION)
+HANDLE_BTF_KIND(6, ENUM)
+HANDLE_BTF_KIND(7, FWD)
+HANDLE_BTF_KIND(8, TYPEDEF)
+HANDLE_BTF_KIND(9, VOLATILE)
+HANDLE_BTF_KIND(10, CONST)
+HANDLE_BTF_KIND(11, RESTRICT)
+HANDLE_BTF_KIND(12, FUNC)
+HANDLE_BTF_KIND(13, FUNC_PROTO)
+
+#undef HANDLE_BTF_KIND

include/llvm/CodeGen/AsmPrinter.h

private:
   // The garbage collection metadata printer table.
   void *GCMetadataPrinters = nullptr; // Really a DenseMap.
 
   /// Emit comments in assembly output if this is true.
   bool VerboseAsm;
 
   static char ID;
 
+protected:
+
   struct HandlerInfo {
     AsmPrinterHandler *Handler;
     const char *TimerName;
     const char *TimerDescription;
     const char *TimerGroupName;
     const char *TimerGroupDescription;
 
     HandlerInfo(AsmPrinterHandler *Handler, const char *TimerName,
public:
   /// fall-through.
   virtual bool
   isBlockOnlyReachableByFallthrough(const MachineBasicBlock *MBB) const;
 
   /// Targets can override this to customize the output of IMPLICIT_DEF
   /// instructions in verbose mode.
   virtual void emitImplicitDef(const MachineInstr *MI) const;
 
+  /// Targets can override this to emit target specific sections.
+  virtual void EmitTargetSections(const char *DbgTimerName,
+                                  const char *DbgTimerDescription) {};
+
   //===------------------------------------------------------------------===//
   // Symbol Lowering Routines.
   //===------------------------------------------------------------------===//
 
   MCSymbol *createTempSymbol(const Twine &Name) const;
 
   /// Return the MCSymbol for a private symbol with global value name as its
   /// base, with the specified suffix.

include/llvm/CodeGen/DebugHandlerBase.h

 //===-- llvm/lib/CodeGen/AsmPrinter/DebugHandlerBase.h --------*- C++ -*--===//
 //
 //                     The LLVM Compiler Infrastructure
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 //
 // Common functionality for different debug information format backends.
-// LLVM currently supports DWARF and CodeView.
+// LLVM currently supports DWARF, CodeView and BTF.
 //
 //===----------------------------------------------------------------------===//
 
 #ifndef LLVM_LIB_CODEGEN_ASMPRINTER_DEBUGHANDLERBASE_H
 #define LLVM_LIB_CODEGEN_ASMPRINTER_DEBUGHANDLERBASE_H
 
-#include "AsmPrinterHandler.h"
-#include "DbgEntityHistoryCalculator.h"
 #include "llvm/ADT/Optional.h"
+#include "llvm/CodeGen/AsmPrinterHandler.h"
+#include "llvm/CodeGen/DbgEntityHistoryCalculator.h"
 #include "llvm/CodeGen/LexicalScopes.h"
 #include "llvm/CodeGen/MachineInstr.h"
 #include "llvm/IR/DebugInfoMetadata.h"
 
 namespace llvm {
 
 class AsmPrinter;
 class MachineInstr;

include/llvm/MC/MCObjectFileInfo.h

protected:
 
   /// COFF specific sections.
   MCSection *DrectveSection;
   MCSection *PDataSection;
   MCSection *XDataSection;
   MCSection *SXDataSection;
   MCSection *GFIDsSection;
 
+  /// BTF-specific sections. BTF stands for BPF Type Format which is
+  /// designed for BPF target and consumed by BPF loader and
+  /// the kernel.
+  /// @{
+  MCSection *BTFSection;
+  MCSection *BTFExtSection;
+  /// @}
+
 public:
   void InitMCObjectFileInfo(const Triple &TT, bool PIC, MCContext &ctx,
                             bool LargeCodeModel = false);
 
   bool getSupportsWeakOmittedEHFrame() const {
     return SupportsWeakOmittedEHFrame;
   }
   bool getSupportsCompactUnwindWithoutEHFrame() const {
public:
   MCSection *getXDataSection() const { return XDataSection; }
   MCSection *getSXDataSection() const { return SXDataSection; }
   MCSection *getGFIDsSection() const { return GFIDsSection; }
 
   MCSection *getEHFrameSection() {
     return EHFrameSection;
   }
 
+  // BTF specific sections.
+  /// @{
+  MCSection *getBTFSection() const { return BTFSection; }
+  MCSection *getBTFExtSection() const { return BTFExtSection; }
+  /// @}
+
   enum Environment { IsMachO, IsELF, IsCOFF, IsWasm };
   Environment getObjectFileType() const { return Env; }
 
   bool isPositionIndependent() const { return PositionIndependent; }
 
 private:
   Environment Env;
   bool PositionIndependent;

lib/CodeGen/AsmPrinter/AsmPrinter.cpp

 //===- AsmPrinter.cpp - Common AsmPrinter code ----------------------------===//
 //
 //                     The LLVM Compiler Infrastructure
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 //
 // This file implements the AsmPrinter class.
 //
 //===----------------------------------------------------------------------===//
 
 #include "llvm/CodeGen/AsmPrinter.h"
-#include "AsmPrinterHandler.h"
 #include "CodeViewDebug.h"
 #include "DwarfDebug.h"
 #include "DwarfException.h"
 #include "WasmException.h"
 #include "WinCFGuard.h"
 #include "WinException.h"
 #include "llvm/ADT/APFloat.h"
 #include "llvm/ADT/APInt.h"
 #include "llvm/ADT/DenseMap.h"
 #include "llvm/ADT/STLExtras.h"
 #include "llvm/ADT/SmallPtrSet.h"
 #include "llvm/ADT/SmallString.h"
 #include "llvm/ADT/SmallVector.h"
 #include "llvm/ADT/Statistic.h"
 #include "llvm/ADT/StringRef.h"
 #include "llvm/ADT/Triple.h"
 #include "llvm/ADT/Twine.h"
 #include "llvm/Analysis/ConstantFolding.h"
 #include "llvm/Analysis/EHPersonalities.h"
 #include "llvm/Analysis/OptimizationRemarkEmitter.h"
 #include "llvm/BinaryFormat/COFF.h"
 #include "llvm/BinaryFormat/Dwarf.h"
 #include "llvm/BinaryFormat/ELF.h"
+#include "llvm/CodeGen/AsmPrinterHandler.h"
 #include "llvm/CodeGen/GCMetadata.h"
 #include "llvm/CodeGen/GCMetadataPrinter.h"
 #include "llvm/CodeGen/GCStrategy.h"
 #include "llvm/CodeGen/MachineBasicBlock.h"
 #include "llvm/CodeGen/MachineConstantPool.h"
 #include "llvm/CodeGen/MachineDominators.h"
 #include "llvm/CodeGen/MachineFrameInfo.h"
 #include "llvm/CodeGen/MachineFunction.h"
if (EmitCodeView && TM.getTargetTriple().isOSWindows()) {
                                      CodeViewLineTablesGroupDescription));
     }
     if (!EmitCodeView || MMI->getModule()->getDwarfVersion()) {
       DD = new DwarfDebug(this, &M);
       DD->beginModule();
       Handlers.push_back(HandlerInfo(DD, DbgTimerName, DbgTimerDescription,
                                      DWARFGroupName, DWARFGroupDescription));
     }
+
+    EmitTargetSections(DbgTimerName, DbgTimerDescription);
   }
 
   switch (MAI->getExceptionHandlingType()) {
   case ExceptionHandling::SjLj:
   case ExceptionHandling::DwarfCFI:
   case ExceptionHandling::ARM:
     isCFIMoveForDebugging = true;
     if (MAI->getExceptionHandlingType() != ExceptionHandling::DwarfCFI)

lib/CodeGen/AsmPrinter/CodeViewDebug.h

 //===- llvm/lib/CodeGen/AsmPrinter/CodeViewDebug.h --------------*- C++ -*-===//
 //
 //                     The LLVM Compiler Infrastructure
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 //
 // This file contains support for writing Microsoft CodeView debug info.
 //
 //===----------------------------------------------------------------------===//
 
 #ifndef LLVM_LIB_CODEGEN_ASMPRINTER_CODEVIEWDEBUG_H
 #define LLVM_LIB_CODEGEN_ASMPRINTER_CODEVIEWDEBUG_H
 
-#include "DbgEntityHistoryCalculator.h"
-#include "DebugHandlerBase.h"
 #include "llvm/ADT/ArrayRef.h"
 #include "llvm/ADT/DenseMap.h"
 #include "llvm/ADT/DenseSet.h"
 #include "llvm/ADT/MapVector.h"
 #include "llvm/ADT/SetVector.h"
 #include "llvm/ADT/SmallVector.h"
+#include "llvm/CodeGen/DbgEntityHistoryCalculator.h"
+#include "llvm/CodeGen/DebugHandlerBase.h"
 #include "llvm/DebugInfo/CodeView/CodeView.h"
 #include "llvm/DebugInfo/CodeView/GlobalTypeTableBuilder.h"
 #include "llvm/DebugInfo/CodeView/TypeIndex.h"
 #include "llvm/IR/DebugLoc.h"
 #include "llvm/Support/Allocator.h"
 #include "llvm/Support/Compiler.h"
 #include <cstdint>
 #include <map>

lib/CodeGen/AsmPrinter/DbgEntityHistoryCalculator.cpp

 //===- llvm/CodeGen/AsmPrinter/DbgEntityHistoryCalculator.cpp -------------===//
 //
 //                     The LLVM Compiler Infrastructure
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 
-#include "DbgEntityHistoryCalculator.h"
+#include "llvm/CodeGen/DbgEntityHistoryCalculator.h"
 #include "llvm/ADT/BitVector.h"
 #include "llvm/ADT/STLExtras.h"
 #include "llvm/ADT/SmallVector.h"
 #include "llvm/CodeGen/MachineBasicBlock.h"
 #include "llvm/CodeGen/MachineFunction.h"
 #include "llvm/CodeGen/MachineInstr.h"
 #include "llvm/CodeGen/MachineOperand.h"
 #include "llvm/CodeGen/TargetLowering.h"

lib/CodeGen/AsmPrinter/DebugHandlerBase.cpp

 //===-- llvm/lib/CodeGen/AsmPrinter/DebugHandlerBase.cpp -------*- C++ -*--===//
 //
 //                     The LLVM Compiler Infrastructure
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 //
 // Common functionality for different debug information format backends.
-// LLVM currently supports DWARF and CodeView.
+// LLVM currently supports DWARF, CodeView and BTF.
 //
 //===----------------------------------------------------------------------===//
 
-#include "DebugHandlerBase.h"
+#include "llvm/CodeGen/DebugHandlerBase.h"
 #include "llvm/ADT/Optional.h"
 #include "llvm/ADT/Twine.h"
 #include "llvm/CodeGen/AsmPrinter.h"
 #include "llvm/CodeGen/MachineFunction.h"
 #include "llvm/CodeGen/MachineInstr.h"
 #include "llvm/CodeGen/MachineModuleInfo.h"
 #include "llvm/CodeGen/TargetSubtargetInfo.h"
 #include "llvm/IR/DebugInfo.h"

lib/CodeGen/AsmPrinter/DwarfCompileUnit.h

 //===- llvm/CodeGen/DwarfCompileUnit.h - Dwarf Compile Unit -----*- C++ -*-===//
 //
 //                     The LLVM Compiler Infrastructure
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 //
 // This file contains support for writing dwarf compile unit.
 //
 //===----------------------------------------------------------------------===//
 
 #ifndef LLVM_LIB_CODEGEN_ASMPRINTER_DWARFCOMPILEUNIT_H
 #define LLVM_LIB_CODEGEN_ASMPRINTER_DWARFCOMPILEUNIT_H
 
-#include "DbgEntityHistoryCalculator.h"
 #include "DwarfDebug.h"
 #include "DwarfUnit.h"
 #include "llvm/ADT/ArrayRef.h"
 #include "llvm/ADT/DenseMap.h"
 #include "llvm/ADT/SmallVector.h"
 #include "llvm/ADT/StringMap.h"
 #include "llvm/ADT/StringRef.h"
 #include "llvm/BinaryFormat/Dwarf.h"
+#include "llvm/CodeGen/DbgEntityHistoryCalculator.h"
 #include "llvm/CodeGen/DIE.h"
 #include "llvm/CodeGen/LexicalScopes.h"
 #include "llvm/IR/DebugInfoMetadata.h"
 #include "llvm/Support/Casting.h"
 #include <algorithm>
 #include <cassert>
 #include <cstdint>
 #include <memory>

lib/CodeGen/AsmPrinter/DwarfDebug.h

 // This file contains support for writing dwarf debug info into asm files.
 //
 //===----------------------------------------------------------------------===//
 
 #ifndef LLVM_LIB_CODEGEN_ASMPRINTER_DWARFDEBUG_H
 #define LLVM_LIB_CODEGEN_ASMPRINTER_DWARFDEBUG_H
 
 #include "AddressPool.h"
-#include "DbgEntityHistoryCalculator.h"
-#include "DebugHandlerBase.h"
 #include "DebugLocStream.h"
 #include "DwarfFile.h"
 #include "llvm/ADT/ArrayRef.h"
 #include "llvm/ADT/DenseMap.h"
 #include "llvm/ADT/DenseSet.h"
 #include "llvm/ADT/MapVector.h"
 #include "llvm/ADT/STLExtras.h"
 #include "llvm/ADT/SetVector.h"
 #include "llvm/ADT/SmallPtrSet.h"
 #include "llvm/ADT/SmallVector.h"
 #include "llvm/ADT/StringMap.h"
 #include "llvm/ADT/StringRef.h"
 #include "llvm/BinaryFormat/Dwarf.h"
 #include "llvm/CodeGen/AccelTable.h"
+#include "llvm/CodeGen/DbgEntityHistoryCalculator.h"
+#include "llvm/CodeGen/DebugHandlerBase.h"
 #include "llvm/CodeGen/MachineInstr.h"
 #include "llvm/IR/DebugInfoMetadata.h"
 #include "llvm/IR/DebugLoc.h"
 #include "llvm/IR/Metadata.h"
 #include "llvm/MC/MCDwarf.h"
 #include "llvm/Support/Allocator.h"
 #include "llvm/Target/TargetOptions.h"
 #include <cassert>

lib/CodeGen/AsmPrinter/EHStreamer.h

 //===- EHStreamer.h - Exception Handling Directive Streamer -----*- C++ -*-===//
 //
 //                     The LLVM Compiler Infrastructure
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 //
 // This file contains support for writing exception info into assembly files.
 //
 //===----------------------------------------------------------------------===//
 
 #ifndef LLVM_LIB_CODEGEN_ASMPRINTER_EHSTREAMER_H
 #define LLVM_LIB_CODEGEN_ASMPRINTER_EHSTREAMER_H
 
-#include "AsmPrinterHandler.h"
 #include "llvm/ADT/DenseMap.h"
+#include "llvm/CodeGen/AsmPrinterHandler.h"
 #include "llvm/Support/Compiler.h"
 
 namespace llvm {
 
 class AsmPrinter;
 struct LandingPadInfo;
 class MachineInstr;
 class MachineModuleInfo;

lib/CodeGen/AsmPrinter/WinCFGuard.h

 //===-- WinCFGuard.h - Windows Control Flow Guard Handling ----*- C++ -*--===//
 //
 //                     The LLVM Compiler Infrastructure
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 //
 // This file contains support for writing windows exception info into asm files.
 //
 //===----------------------------------------------------------------------===//
 
 #ifndef LLVM_LIB_CODEGEN_ASMPRINTER_WINCFGUARD_H
 #define LLVM_LIB_CODEGEN_ASMPRINTER_WINCFGUARD_H
 
-#include "AsmPrinterHandler.h"
+#include "llvm/CodeGen/AsmPrinterHandler.h"
 #include "llvm/Support/Compiler.h"
 
 namespace llvm {
 
 class LLVM_LIBRARY_VISIBILITY WinCFGuard : public AsmPrinterHandler {
   /// Target of directive emission.
   AsmPrinter *Asm;
 

lib/MC/MCObjectFileInfo.cpp

void MCObjectFileInfo::initELFMCObjectFileInfo(const Triple &T, bool Large) {
 
   FaultMapSection =
       Ctx->getELFSection(".llvm_faultmaps", ELF::SHT_PROGBITS, ELF::SHF_ALLOC);
 
   EHFrameSection =
       Ctx->getELFSection(".eh_frame", EHSectionType, EHSectionFlags);
 
   StackSizesSection = Ctx->getELFSection(".stack_sizes", ELF::SHT_PROGBITS, 0);
+
+  BTFSection = Ctx->getELFSection(".BTF", ELF::SHT_PROGBITS, 0);
+  BTFExtSection = Ctx->getELFSection(".BTF.ext", ELF::SHT_PROGBITS, 0);
 }
 
 void MCObjectFileInfo::initCOFFMCObjectFileInfo(const Triple &T) {
   EHFrameSection =
       Ctx->getCOFFSection(".eh_frame", COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
                                            COFF::IMAGE_SCN_MEM_READ,
                           SectionKind::getData());
 

lib/Target/BPF/BPFAsmPrinter.cpp

 // of machine-dependent LLVM code to the BPF assembly language.
 //
 //===----------------------------------------------------------------------===//
 
 #include "BPF.h"
 #include "BPFInstrInfo.h"
 #include "BPFMCInstLower.h"
 #include "BPFTargetMachine.h"
+#include "BTFDebug.h"
 #include "InstPrinter/BPFInstPrinter.h"
 #include "llvm/CodeGen/AsmPrinter.h"
 #include "llvm/CodeGen/MachineConstantPool.h"
 #include "llvm/CodeGen/MachineFunctionPass.h"
 #include "llvm/CodeGen/MachineInstr.h"
 #include "llvm/CodeGen/MachineModuleInfo.h"
 #include "llvm/MC/MCAsmInfo.h"
 #include "llvm/MC/MCInst.h"
public:
   bool PrintAsmOperand(const MachineInstr *MI, unsigned OpNo,
                        unsigned AsmVariant, const char *ExtraCode,
                        raw_ostream &O) override;
   bool PrintAsmMemoryOperand(const MachineInstr *MI, unsigned OpNum,
                              unsigned AsmVariant, const char *ExtraCode,
                              raw_ostream &O) override;
 
   void EmitInstruction(const MachineInstr *MI) override;
+  void EmitTargetSections(const char *DbgTimerName,
+                          const char *DbgTimerDescription) override;
 };
 } // namespace
 
 void BPFAsmPrinter::printOperand(const MachineInstr *MI, int OpNum,
                                  raw_ostream &O) {
   const MachineOperand &MO = MI->getOperand(OpNum);
 
   switch (MO.getType()) {
void BPFAsmPrinter::EmitInstruction(const MachineInstr *MI) {
 
   BPFMCInstLower MCInstLowering(OutContext, *this);
 
   MCInst TmpInst;
   MCInstLowering.Lower(MI, TmpInst);
   EmitToStreamer(*OutStreamer, TmpInst);
 }
 
+void BPFAsmPrinter::EmitTargetSections(const char *DbgTimerName,
+                                       const char *DbgTimerDescription) {
+  Handlers.push_back(HandlerInfo(new BTFDebug(this),
+                                 DbgTimerName, DbgTimerDescription,
+                                 "BTF", "BTF Emission"));
+}
+
 // Force static initialization.
 extern "C" void LLVMInitializeBPFAsmPrinter() {
   RegisterAsmPrinter<BPFAsmPrinter> X(getTheBPFleTarget());
   RegisterAsmPrinter<BPFAsmPrinter> Y(getTheBPFbeTarget());
   RegisterAsmPrinter<BPFAsmPrinter> Z(getTheBPFTarget());
 }

lib/Target/BPF/BTFDebug.h

+//===- llvm/lib/CodeGen/AsmPrinter/BTFDebug.h -------------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+///
+/// \file
+/// This file contains support for writing BTF debug info.
+///
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIB_CODEGEN_ASMPRINTER_BTFDEBUG_H
+#define LLVM_LIB_CODEGEN_ASMPRINTER_BTFDEBUG_H
+
+#include "llvm/ADT/StringMap.h"
+#include "llvm/BinaryFormat/BTF.h"
+#include "llvm/CodeGen/DebugHandlerBase.h"
+#include <unordered_map>
+
+namespace llvm {
+
+class AsmPrinter;
+class BTFDebug;
+class DIType;
+class MCStreamer;
+class MCSymbol;
+class MachineFunction;
+
+/// The base class for BTF type generation.
+class BTFTypeBase {
+protected:
+  uint8_t Kind;
+  uint32_t Id;
+  struct BTF::CommonType BTFType;
+
+public:
+  virtual ~BTFTypeBase() = default;
+  void setId(uint32_t Id) { this->Id = Id; }
+  uint32_t getId() { return Id; }
+  uint32_t roundupToBytes(uint32_t NumBits) { return (NumBits + 7) >> 3; }
+  /// Get the size of this BTF type entry.
+  virtual uint32_t getSize() { return BTF::CommonTypeSize; }
+  /// Complete BTF type generation after all related DebugInfo types
+  /// have been visited so their BTF type id's are available
+  /// for cross referece.
+  virtual void completeType(BTFDebug &BDebug) {}
+  /// Emit types for this BTF type entry.
+  virtual void emitType(MCStreamer &OS);
+};
+
+/// Handle several derived types include pointer, const,
+/// volatile, typedef and restrict.
+class BTFTypeDerived : public BTFTypeBase {
+  const DIDerivedType *DTy;
+
+public:
+  BTFTypeDerived(const DIDerivedType *Ty, unsigned Tag);
+  void completeType(BTFDebug &BDebug);
+  void emitType(MCStreamer &OS);
+};
+
+/// Handle struct or union forward declaration.
+class BTFTypeFwd : public BTFTypeBase {
+  StringRef Name;
+
+public:
+  BTFTypeFwd(StringRef Name, bool IsUnion);
+  void completeType(BTFDebug &BDebug);
+  void emitType(MCStreamer &OS);
+};
+
+/// Handle int type.
+class BTFTypeInt : public BTFTypeBase {
+  StringRef Name;
+  uint32_t IntVal; ///< Encoding, offset, bits
+
+public:
+  BTFTypeInt(uint32_t Encoding, uint32_t SizeInBits, uint32_t OffsetInBits,
+             StringRef TypeName);
+  uint32_t getSize() { return BTFTypeBase::getSize() + sizeof(uint32_t); }
+  void completeType(BTFDebug &BDebug);
+  void emitType(MCStreamer &OS);
+};
+
+/// Handle enumerate type.
+class BTFTypeEnum : public BTFTypeBase {
+  const DICompositeType *ETy;
+  std::vector<struct BTF::BTFEnum> EnumValues;
+
+public:
+  BTFTypeEnum(const DICompositeType *ETy, uint32_t NumValues);
+  uint32_t getSize() {
+    return BTFTypeBase::getSize() + EnumValues.size() * BTF::BTFEnumSize;
+  }
+  void completeType(BTFDebug &BDebug);
+  void emitType(MCStreamer &OS);
+};
+
+/// Handle array type.
+class BTFTypeArray : public BTFTypeBase {
+  const DICompositeType *ATy;
+  struct BTF::BTFArray ArrayInfo;
+
+public:
+  BTFTypeArray(const DICompositeType *ATy);
+  uint32_t getSize() { return BTFTypeBase::getSize() + BTF::BTFArraySize; }
+  void completeType(BTFDebug &BDebug);
+  void emitType(MCStreamer &OS);
+};
+
+/// Handle struct/union type.
+class BTFTypeStruct : public BTFTypeBase {
+  const DICompositeType *STy;
+  bool HasBitField;
+  std::vector<struct BTF::BTFMember> Members;
+
+public:
+  BTFTypeStruct(const DICompositeType *STy, bool IsStruct, bool HasBitField,
+                uint32_t NumMembers);
+  uint32_t getSize() {
+    return BTFTypeBase::getSize() + Members.size() * BTF::BTFMemberSize;
+  }
+  void completeType(BTFDebug &BDebug);
+  void emitType(MCStreamer &OS);
+};
+
+/// Handle function pointer.
+class BTFTypeFuncProto : public BTFTypeBase {
+  const DISubroutineType *STy;
+  std::unordered_map<uint32_t, StringRef> FuncArgNames;
+  std::vector<struct BTF::BTFParam> Parameters;
+
+public:
+  BTFTypeFuncProto(const DISubroutineType *STy, uint32_t NumParams,
+                   const std::unordered_map<uint32_t, StringRef> &FuncArgNames);
+  uint32_t getSize() {
+    return BTFTypeBase::getSize() + Parameters.size() * BTF::BTFParamSize;
+  }
+  void completeType(BTFDebug &BDebug);
+  void emitType(MCStreamer &OS);
+};
+
+/// Handle subprogram
+class BTFTypeFunc : public BTFTypeBase {
+  StringRef Name;
+
+public:
+  BTFTypeFunc(StringRef FuncName, uint32_t ProtoTypeId);
+  uint32_t getSize() { return BTFTypeBase::getSize(); }
+  void completeType(BTFDebug &BDebug);
+  void emitType(MCStreamer &OS);
+};
+
+/// String table.
+class BTFStringTable {
+  /// String table size in bytes.
+  uint32_t Size;
+  /// A mapping from string table offset to the index
+  /// of the Table. It is used to avoid putting
+  /// duplicated strings in the table.
+  std::unordered_map<uint32_t, uint32_t> OffsetToIdMap;
+  /// A vector of strings to represent the string table.
+  std::vector<std::string> Table;
+
+public:
+  BTFStringTable() : Size(0) {}
+  uint32_t getSize() { return Size; }
+  std::vector<std::string> &getTable() { return Table; }
+  /// Add a string to the string table and returns its offset
+  /// in the table.
+  uint32_t addString(StringRef S);
+};
+
+/// Represent one func and its type id.
+struct BTFFuncInfo {
+  const MCSymbol *Label; ///< Func MCSymbol
+  uint32_t TypeId;       ///< Type id referring to .BTF type section
+};
+
+/// Represent one line info.
+struct BTFLineInfo {
+  MCSymbol *Label;      ///< MCSymbol identifying insn for the lineinfo
+  uint32_t FileNameOff; ///< file name offset in the .BTF string table
+  uint32_t LineOff;     ///< line offset in the .BTF string table
+  uint32_t LineNum;     ///< the line number
+  uint32_t ColumnNum;   ///< the column number
+};
+
+/// Collect and emit BTF information.
+class BTFDebug : public DebugHandlerBase {
+  MCStreamer &OS;
+  bool SkipInstruction;
+  bool LineInfoGenerated;
+  uint32_t SecNameOff;
+  uint32_t ArrayIndexTypeId;
+  BTFStringTable StringTable;
+  std::vector<std::unique_ptr<BTFTypeBase>> TypeEntries;
+  std::unordered_map<const DIType *, uint32_t> DIToIdMap;
+  std::unordered_map<uint32_t, std::vector<BTFFuncInfo>> FuncInfoTable;
+  std::unordered_map<uint32_t, std::vector<BTFLineInfo>> LineInfoTable;
+  StringMap<std::vector<std::string>> FileContent;
+
+  /// Add types to TypeEntries.
+  /// @{
+  /// Add types to TypeEntries and DIToIdMap.
+  void addType(std::unique_ptr<BTFTypeBase> TypeEntry, const DIType *Ty);
+  /// Add types to TypeEntries only and return type id.
+  uint32_t addType(std::unique_ptr<BTFTypeBase> TypeEntry);
+  /// @}
+
+  /// IR type visiting functions.
+  /// @{
+  void visitTypeEntry(const DIType *Ty);
+  void visitBasicType(const DIBasicType *BTy);
+  void visitSubroutineType(
+      const DISubroutineType *STy, bool ForSubprog,
+      const std::unordered_map<uint32_t, StringRef> &FuncArgNames,
+      uint32_t &TypeId);
+  void visitFwdDeclType(const DICompositeType *CTy, bool IsUnion);
+  void visitCompositeType(const DICompositeType *CTy);
+  void visitStructType(const DICompositeType *STy, bool IsStruct);
+  void visitArrayType(const DICompositeType *ATy);
+  void visitEnumType(const DICompositeType *ETy);
+  void visitDerivedType(const DIDerivedType *DTy);
+  /// @}
+
+  /// Get the file content for the subprogram. Certain lines of the file
+  /// later may be put into string table and referenced by line info.
+  std::string populateFileContent(const DISubprogram *SP);
+
+  /// Construct a line info.
+  void constructLineInfo(const DISubprogram *SP, MCSymbol *Label, uint32_t Line,
+                         uint32_t Column);
+
+  /// Emit common header of .BTF and .BTF.ext sections.
+  void emitCommonHeader();
+
+  /// Emit the .BTF section.
+  void emitBTFSection();
+
+  /// Emit the .BTF.ext section.
+  void emitBTFExtSection();
+
+protected:
+  /// Gather pre-function debug information.
+  void beginFunctionImpl(const MachineFunction *MF) override;
+
+  /// Post process after all instructions in this function are processed.
+  void endFunctionImpl(const MachineFunction *MF) override;
+
+public:
+  BTFDebug(AsmPrinter *AP);
+
+  /// Get the special array index type id.
+  uint32_t getArrayIndexTypeId() {
+    assert(ArrayIndexTypeId);
+    return ArrayIndexTypeId;
+  }
+
+  /// Add string to the string table.
+  size_t addString(StringRef S) { return StringTable.addString(S); }
+
+  /// Get the type id for a particular DIType.
+  uint32_t getTypeId(const DIType *Ty) {
+    assert(Ty && "Invalid null Type");
+    assert(DIToIdMap.find(Ty) != DIToIdMap.end() &&
+           "DIType not added in the BDIToIdMap");
+    return DIToIdMap[Ty];
+  }
+
+  void setSymbolSize(const MCSymbol *Symbol, uint64_t Size) override {}
+
+  /// Process beginning of an instruction.
+  void beginInstruction(const MachineInstr *MI) override;
+
+  /// Complete all the types and emit the BTF sections.
+  void endModule() override;
+};
+
+} // end namespace llvm
+
+#endif // LLVM_LIB_CODEGEN_ASMPRINTER_BTFDEBUG_H

lib/Target/BPF/BTFDebug.cpp

+//===- llvm/lib/CodeGen/AsmPrinter/BTFDebug.cpp ---------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file contains support for writing BTF debug info.
+//
+//===----------------------------------------------------------------------===//
+
+#include "BTFDebug.h"
+#include "llvm/CodeGen/AsmPrinter.h"
+#include "llvm/CodeGen/MachineModuleInfo.h"
+#include "llvm/MC/MCContext.h"
+#include "llvm/MC/MCObjectFileInfo.h"
+#include "llvm/MC/MCSectionELF.h"
+#include "llvm/MC/MCStreamer.h"
+#include <fstream>
+#include <sstream>
+
+using namespace llvm;
+
+static const char *BTFKindStr[] = {
+#define HANDLE_BTF_KIND(ID, NAME) "BTF_KIND_" #NAME,
+#include "llvm/BinaryFormat/BTF.def"
+};
+
+/// Emit a BTF common type.
+void BTFTypeBase::emitType(MCStreamer &OS) {
+  OS.AddComment(std::string(BTFKindStr[Kind]) + "(id = " + std::to_string(Id) +
+                ")");
+  OS.EmitIntValue(BTFType.NameOff, 4);
+  OS.AddComment("0x" + Twine::utohexstr(BTFType.Info));
+  OS.EmitIntValue(BTFType.Info, 4);
+  OS.EmitIntValue(BTFType.Size, 4);
+}
+
+BTFTypeDerived::BTFTypeDerived(const DIDerivedType *DTy, unsigned Tag)
+    : DTy(DTy) {
+  switch (Tag) {
+  case dwarf::DW_TAG_pointer_type:
+    Kind = BTF::BTF_KIND_PTR;
+    break;
+  case dwarf::DW_TAG_const_type:
+    Kind = BTF::BTF_KIND_CONST;
+    break;
+  case dwarf::DW_TAG_volatile_type:
+    Kind = BTF::BTF_KIND_VOLATILE;
+    break;
+  case dwarf::DW_TAG_typedef:
+    Kind = BTF::BTF_KIND_TYPEDEF;
+    break;
+  case dwarf::DW_TAG_restrict_type:
+    Kind = BTF::BTF_KIND_RESTRICT;
+    break;
+  default:
+    llvm_unreachable("Unknown DIDerivedType Tag");
+  }
+  BTFType.Info = Kind << 24;
+}
+
+void BTFTypeDerived::completeType(BTFDebug &BDebug) {
+  BTFType.NameOff = BDebug.addString(DTy->getName());
+
+  // The base type for PTR/CONST/VOLATILE could be void.
+  const DIType *ResolvedType = DTy->getBaseType().resolve();
+  if (!ResolvedType) {
+    assert((Kind == BTF::BTF_KIND_PTR || Kind == BTF::BTF_KIND_CONST ||
+            Kind == BTF::BTF_KIND_VOLATILE) &&
+           "Invalid null basetype");
+    BTFType.Type = 0;
+  } else {
+    BTFType.Type = BDebug.getTypeId(ResolvedType);
+  }
+}
+
+void BTFTypeDerived::emitType(MCStreamer &OS) { BTFTypeBase::emitType(OS); }
+
+/// Represent a struct/union forward declaration.
+BTFTypeFwd::BTFTypeFwd(StringRef Name, bool IsUnion) : Name(Name) {
+  Kind = BTF::BTF_KIND_FWD;
+  BTFType.Info = IsUnion << 31 | Kind << 24;
+  BTFType.Type = 0;
+}
+
+void BTFTypeFwd::completeType(BTFDebug &BDebug) {
+  BTFType.NameOff = BDebug.addString(Name);
+}
+
+void BTFTypeFwd::emitType(MCStreamer &OS) { BTFTypeBase::emitType(OS); }
+
+BTFTypeInt::BTFTypeInt(uint32_t Encoding, uint32_t SizeInBits,
+                       uint32_t OffsetInBits, StringRef TypeName)
+    : Name(TypeName) {
+  // Translate IR int encoding to BTF int encoding.
+  uint8_t BTFEncoding;
+  switch (Encoding) {
+  case dwarf::DW_ATE_boolean:
+    BTFEncoding = BTF::INT_BOOL;
+    break;
+  case dwarf::DW_ATE_signed:
+  case dwarf::DW_ATE_signed_char:
+    BTFEncoding = BTF::INT_SIGNED;
+    break;
+  case dwarf::DW_ATE_unsigned:
+  case dwarf::DW_ATE_unsigned_char:
+    BTFEncoding = 0;
+    break;
+  default:
+    llvm_unreachable("Unknown BTFTypeInt Encoding");
+  }
+
+  Kind = BTF::BTF_KIND_INT;
+  BTFType.Info = Kind << 24;
+  BTFType.Size = roundupToBytes(SizeInBits);
+  IntVal = (BTFEncoding << 24) | OffsetInBits << 16 | SizeInBits;
+}
+
+void BTFTypeInt::completeType(BTFDebug &BDebug) {
+  BTFType.NameOff = BDebug.addString(Name);
+}
+
+void BTFTypeInt::emitType(MCStreamer &OS) {
+  BTFTypeBase::emitType(OS);
+  OS.AddComment("0x" + Twine::utohexstr(IntVal));
+  OS.EmitIntValue(IntVal, 4);
+}
+
+BTFTypeEnum::BTFTypeEnum(const DICompositeType *ETy, uint32_t VLen) : ETy(ETy) {
+  Kind = BTF::BTF_KIND_ENUM;
+  BTFType.Info = Kind << 24 | VLen;
+  BTFType.Size = roundupToBytes(ETy->getSizeInBits());
+}
+
+void BTFTypeEnum::completeType(BTFDebug &BDebug) {
+  BTFType.NameOff = BDebug.addString(ETy->getName());
+
+  DINodeArray Elements = ETy->getElements();
+  for (const auto Element : Elements) {
+    const auto *Enum = cast<DIEnumerator>(Element);
+
+    struct BTF::BTFEnum BTFEnum;
+    BTFEnum.NameOff = BDebug.addString(Enum->getName());
+    // BTF enum value is 32bit, enforce it.
+    BTFEnum.Val = static_cast<uint32_t>(Enum->getValue());
+    EnumValues.push_back(BTFEnum);
+  }
+}
+
+void BTFTypeEnum::emitType(MCStreamer &OS) {
+  BTFTypeBase::emitType(OS);
+  for (const auto &Enum : EnumValues) {
+    OS.EmitIntValue(Enum.NameOff, 4);
+    OS.EmitIntValue(Enum.Val, 4);
+  }
+}
+
+BTFTypeArray::BTFTypeArray(const DICompositeType *ATy) : ATy(ATy) {
+  Kind = BTF::BTF_KIND_ARRAY;
+  BTFType.Info = Kind << 24;
+}
+
+/// Represent a BTF array. BTF does not record array dimensions,
+/// so conceptually a BTF array is a one-dimensional array.
+void BTFTypeArray::completeType(BTFDebug &BDebug) {
+  BTFType.NameOff = BDebug.addString(ATy->getName());
+  BTFType.Size = 0;
+
+  auto *BaseType = ATy->getBaseType().resolve();
+  ArrayInfo.ElemType = BDebug.getTypeId(BaseType);
+
+  // The IR does not really have a type for the index.
+  // A special type for array index should have been
+  // created during initial type traversal. Just
+  // retrieve that type id.
+  ArrayInfo.IndexType = BDebug.getArrayIndexTypeId();
+
+  // Get the number of array elements.
+  // If the array size is 0, set the number of elements as 0.
+  // Otherwise, recursively traverse the base types to
+  // find the element size. The number of elements is
+  // the totoal array size in bits divided by
+  // element size in bits.
+  uint64_t ArraySizeInBits = ATy->getSizeInBits();
+  if (!ArraySizeInBits) {
+    ArrayInfo.Nelems = 0;
+  } else {
+    uint32_t BaseTypeSize = BaseType->getSizeInBits();
+    while (!BaseTypeSize) {
+      const auto *DDTy = cast<DIDerivedType>(BaseType);
+      BaseType = DDTy->getBaseType().resolve();
+      assert(BaseType);
+      BaseTypeSize = BaseType->getSizeInBits();
+    }
+    ArrayInfo.Nelems = ATy->getSizeInBits() / BaseTypeSize;
+  }
+}
+
+void BTFTypeArray::emitType(MCStreamer &OS) {
+  BTFTypeBase::emitType(OS);
+  OS.EmitIntValue(ArrayInfo.ElemType, 4);
+  OS.EmitIntValue(ArrayInfo.IndexType, 4);
+  OS.EmitIntValue(ArrayInfo.Nelems, 4);
+}
+
+/// Represent either a struct or a union.
+BTFTypeStruct::BTFTypeStruct(const DICompositeType *STy, bool IsStruct,
+                             bool HasBitField, uint32_t Vlen)
+    : STy(STy), HasBitField(HasBitField) {
+  Kind = IsStruct ? BTF::BTF_KIND_STRUCT : BTF::BTF_KIND_UNION;
+  BTFType.Size = roundupToBytes(STy->getSizeInBits());
+  BTFType.Info = (HasBitField << 31) | (Kind << 24) | Vlen;
+}
+
+void BTFTypeStruct::completeType(BTFDebug &BDebug) {
+  BTFType.NameOff = BDebug.addString(STy->getName());
+
+  // Add struct/union members.
+  const DINodeArray Elements = STy->getElements();
+  for (const auto *Element : Elements) {
+    struct BTF::BTFMember BTFMember;
+    const auto *DDTy = cast<DIDerivedType>(Element);
+
+    BTFMember.NameOff = BDebug.addString(DDTy->getName());
+    if (HasBitField) {
+      uint8_t BitFieldSize = DDTy->isBitField() ? DDTy->getSizeInBits() : 0;
+      BTFMember.Offset = BitFieldSize << 24 | DDTy->getOffsetInBits();
+    } else {
+      BTFMember.Offset = DDTy->getOffsetInBits();
+    }
+    BTFMember.Type = BDebug.getTypeId(DDTy->getBaseType().resolve());
+    Members.push_back(BTFMember);
+  }
+}
+
+void BTFTypeStruct::emitType(MCStreamer &OS) {
+  BTFTypeBase::emitType(OS);
+  for (const auto &Member : Members) {
+    OS.EmitIntValue(Member.NameOff, 4);
+    OS.EmitIntValue(Member.Type, 4);
+    OS.AddComment("0x" + Twine::utohexstr(Member.Offset));
+    OS.EmitIntValue(Member.Offset, 4);
+  }
+}
+
+/// The Func kind represents both subprogram and pointee of function
+/// pointers. If the FuncName is empty, it represents a pointee of function
+/// pointer. Otherwise, it represents a subprogram. The func arg names
+/// are empty for pointee of function pointer case, and are valid names
+/// for subprogram.
+BTFTypeFuncProto::BTFTypeFuncProto(
+    const DISubroutineType *STy, uint32_t VLen,
+    const std::unordered_map<uint32_t, StringRef> &FuncArgNames)
+    : STy(STy), FuncArgNames(FuncArgNames) {
+  Kind = BTF::BTF_KIND_FUNC_PROTO;
+  BTFType.Info = (Kind << 24) | VLen;
+}
+
+void BTFTypeFuncProto::completeType(BTFDebug &BDebug) {
+  DITypeRefArray Elements = STy->getTypeArray();
+  auto RetType = Elements[0].resolve();
+  BTFType.Type = RetType ? BDebug.getTypeId(RetType) : 0;
+  BTFType.NameOff = 0;
+
+  // For null parameter which is typically the last one
+  // to represent the vararg, encode the NameOff/Type to be 0.
+  for (unsigned I = 1, N = Elements.size(); I < N; ++I) {
+    struct BTF::BTFParam Param;
+    auto Element = Elements[I].resolve();
+    if (Element) {
+      Param.NameOff = BDebug.addString(FuncArgNames[I]);
+      Param.Type = BDebug.getTypeId(Element);
+    } else {
+      Param.NameOff = 0;
+      Param.Type = 0;
+    }
+    Parameters.push_back(Param);
+  }
+}
+
+void BTFTypeFuncProto::emitType(MCStreamer &OS) {
+  BTFTypeBase::emitType(OS);
+  for (const auto &Param : Parameters) {
+    OS.EmitIntValue(Param.NameOff, 4);
+    OS.EmitIntValue(Param.Type, 4);
+  }
+}
+
+BTFTypeFunc::BTFTypeFunc(StringRef FuncName, uint32_t ProtoTypeId)
+    : Name(FuncName) {
+  Kind = BTF::BTF_KIND_FUNC;
+  BTFType.Info = Kind << 24;
+  BTFType.Type = ProtoTypeId;
+}
+
+void BTFTypeFunc::completeType(BTFDebug &BDebug) {
+  BTFType.NameOff = BDebug.addString(Name);
+}
+
+void BTFTypeFunc::emitType(MCStreamer &OS) { BTFTypeBase::emitType(OS); }
+
+uint32_t BTFStringTable::addString(StringRef S) {
+  // Check whether the string already exists.
+  for (auto &OffsetM : OffsetToIdMap) {
+    if (Table[OffsetM.second] == S)
+      return OffsetM.first;
+  }
+  // Not find, add to the string table.
+  uint32_t Offset = Size;
+  OffsetToIdMap[Offset] = Table.size();
+  Table.push_back(S);
+  Size += S.size() + 1;
+  return Offset;
+}
+
+BTFDebug::BTFDebug(AsmPrinter *AP)
+    : DebugHandlerBase(AP), OS(*Asm->OutStreamer), SkipInstruction(false),
+      LineInfoGenerated(false), SecNameOff(0), ArrayIndexTypeId(0) {
+  addString("\0");
+}
+
+void BTFDebug::addType(std::unique_ptr<BTFTypeBase> TypeEntry,
+                       const DIType *Ty) {
+  TypeEntry->setId(TypeEntries.size() + 1);
+  DIToIdMap[Ty] = TypeEntry->getId();
+  TypeEntries.push_back(std::move(TypeEntry));
+}
+
+uint32_t BTFDebug::addType(std::unique_ptr<BTFTypeBase> TypeEntry) {
+  TypeEntry->setId(TypeEntries.size() + 1);
+  uint32_t Id = TypeEntry->getId();
+  TypeEntries.push_back(std::move(TypeEntry));
+  return Id;
+}
+
+void BTFDebug::visitBasicType(const DIBasicType *BTy) {
+  // Only int types are supported in BTF.
+  uint32_t Encoding = BTy->getEncoding();
+  if (Encoding != dwarf::DW_ATE_boolean && Encoding != dwarf::DW_ATE_signed &&
+      Encoding != dwarf::DW_ATE_signed_char &&
+      Encoding != dwarf::DW_ATE_unsigned &&
+      Encoding != dwarf::DW_ATE_unsigned_char)
+    return;
+
+  // Create a BTF type instance for this DIBasicType and put it into
+  // DIToIdMap for cross-type reference check.
+  auto TypeEntry = llvm::make_unique<BTFTypeInt>(
+      Encoding, BTy->getSizeInBits(), BTy->getOffsetInBits(), BTy->getName());
+  addType(std::move(TypeEntry), BTy);
+}
+
+/// Handle subprogram or subroutine types.
+void BTFDebug::visitSubroutineType(
+    const DISubroutineType *STy, bool ForSubprog,
+    const std::unordered_map<uint32_t, StringRef> &FuncArgNames,
+    uint32_t &TypeId) {
+  DITypeRefArray Elements = STy->getTypeArray();
+  uint32_t VLen = Elements.size() - 1;
+  if (VLen > BTF::MAX_VLEN)
+    return;
+
+  // Subprogram has a valid non-zero-length name, and the pointee of
+  // a function pointer has an empty name. The subprogram type will
+  // not be added to DIToIdMap as it should not be referenced by
+  // any other types.
+  auto TypeEntry = llvm::make_unique<BTFTypeFuncProto>(STy, VLen, FuncArgNames);
+  if (ForSubprog)
+    TypeId = addType(std::move(TypeEntry)); // For subprogram
+  else
+    addType(std::move(TypeEntry), STy); // For func ptr
+
+  // Visit return type and func arg types.
+  for (const auto Element : Elements) {
+    visitTypeEntry(Element.resolve());
+  }
+}
+
+/// Handle structure/union types.
+void BTFDebug::visitStructType(const DICompositeType *CTy, bool IsStruct) {
+  const DINodeArray Elements = CTy->getElements();
+  uint32_t VLen = Elements.size();
+  if (VLen > BTF::MAX_VLEN)
+    return;
+
+  // Check whether we have any bitfield members or not
+  bool HasBitField = false;
+  for (const auto *Element : Elements) {
+    auto E = cast<DIDerivedType>(Element);
+    if (E->isBitField()) {
+      HasBitField = true;
+      break;
+    }
+  }
+
+  auto TypeEntry =
+      llvm::make_unique<BTFTypeStruct>(CTy, IsStruct, HasBitField, VLen);
+  addType(std::move(TypeEntry), CTy);
+
+  // Visit all struct members.
+  for (const auto *Element : Elements)
+    visitTypeEntry(cast<DIDerivedType>(Element));
+}
+
+void BTFDebug::visitArrayType(const DICompositeType *CTy) {
+  auto TypeEntry = llvm::make_unique<BTFTypeArray>(CTy);
+  addType(std::move(TypeEntry), CTy);
+
+  // The IR does not have a type for array index while BTF wants one.
+  // So create an array index type if there is none.
+  if (!ArrayIndexTypeId) {
+    auto TypeEntry = llvm::make_unique<BTFTypeInt>(dwarf::DW_ATE_unsigned, 32,
+                                                   0, "__ARRAY_SIZE_TYPE__");
+    ArrayIndexTypeId = addType(std::move(TypeEntry));
+  }
+
+  // Visit array element type.
+  visitTypeEntry(CTy->getBaseType().resolve());
+}
+
+void BTFDebug::visitEnumType(const DICompositeType *CTy) {
+  DINodeArray Elements = CTy->getElements();
+  uint32_t VLen = Elements.size();
+  if (VLen > BTF::MAX_VLEN)
+    return;
+
+  auto TypeEntry = llvm::make_unique<BTFTypeEnum>(CTy, VLen);
+  addType(std::move(TypeEntry), CTy);
+  // No need to visit base type as BTF does not encode it.
+}
+
+/// Handle structure/union forward declarations.
+void BTFDebug::visitFwdDeclType(const DICompositeType *CTy, bool IsUnion) {
+  auto TypeEntry = llvm::make_unique<BTFTypeFwd>(CTy->getName(), IsUnion);
+  addType(std::move(TypeEntry), CTy);
+}
+
+/// Handle structure, union, array and enumeration types.
+void BTFDebug::visitCompositeType(const DICompositeType *CTy) {
+  auto Tag = CTy->getTag();
+  if (Tag == dwarf::DW_TAG_structure_type || Tag == dwarf::DW_TAG_union_type) {
+    // Handle forward declaration differently as it does not have members.
+    if (CTy->isForwardDecl())
+      visitFwdDeclType(CTy, Tag == dwarf::DW_TAG_union_type);
+    else
+      visitStructType(CTy, Tag == dwarf::DW_TAG_structure_type);
+  } else if (Tag == dwarf::DW_TAG_array_type)
+    visitArrayType(CTy);
+  else if (Tag == dwarf::DW_TAG_enumeration_type)
+    visitEnumType(CTy);
+}
+
+/// Handle pointer, typedef, const, volatile, restrict and member types.
+void BTFDebug::visitDerivedType(const DIDerivedType *DTy) {
+  unsigned Tag = DTy->getTag();
+
+  if (Tag == dwarf::DW_TAG_pointer_type || Tag == dwarf::DW_TAG_typedef ||
+      Tag == dwarf::DW_TAG_const_type || Tag == dwarf::DW_TAG_volatile_type ||
+      Tag == dwarf::DW_TAG_restrict_type) {
+    auto TypeEntry = llvm::make_unique<BTFTypeDerived>(DTy, Tag);
+    addType(std::move(TypeEntry), DTy);
+  } else if (Tag != dwarf::DW_TAG_member) {
+    return;
+  }
+
+  // Visit base type of pointer, typedef, const, volatile, restrict or
+  // struct/union member.
+  visitTypeEntry(DTy->getBaseType().resolve());
+}
+
+void BTFDebug::visitTypeEntry(const DIType *Ty) {
+  if (!Ty || DIToIdMap.find(Ty) != DIToIdMap.end())
+    return;
+
+  uint32_t TypeId;
+  if (const auto *BTy = dyn_cast<DIBasicType>(Ty))
+    visitBasicType(BTy);
+  else if (const auto *STy = dyn_cast<DISubroutineType>(Ty))
+    visitSubroutineType(STy, false, std::unordered_map<uint32_t, StringRef>(),
+                        TypeId);
+  else if (const auto *CTy = dyn_cast<DICompositeType>(Ty))
+    visitCompositeType(CTy);
+  else if (const auto *DTy = dyn_cast<DIDerivedType>(Ty))
+    visitDerivedType(DTy);
+  else
+    llvm_unreachable("Unknown DIType");
+}
+
+/// Read file contents from the actual file or from the source
+std::string BTFDebug::populateFileContent(const DISubprogram *SP) {
+  auto File = SP->getFile();
+  std::string FileName;
+
+  if (File->getDirectory().size())
+    FileName = File->getDirectory().str() + "/" + File->getFilename().str();
+  else
+    FileName = File->getFilename();
+
+  // No need to populate the contends if it has been populated!
+  if (FileContent.find(FileName) != FileContent.end())
+    return FileName;
+
+  std::vector<std::string> Content;
+  std::string Line;
+  Content.push_back(Line); // Line 0 for empty string
+
+  auto Source = File->getSource();
+  if (Source) {
+    std::istringstream InputString(Source.getValue());
+    while (std::getline(InputString, Line))
+      Content.push_back(Line);
+  } else {
+    std::ifstream InputFile(FileName);
+    while (std::getline(InputFile, Line))
+      Content.push_back(Line);
+  }
+
+  FileContent[FileName] = Content;
+  return FileName;
+}
+
+void BTFDebug::constructLineInfo(const DISubprogram *SP, MCSymbol *Label,
+                                 uint32_t Line, uint32_t Column) {
+  std::string FileName = populateFileContent(SP);
+  BTFLineInfo LineInfo;
+
+  LineInfo.Label = Label;
+  LineInfo.FileNameOff = addString(FileName);
+  // If file content is not available, let LineOff = 0.
+  if (Line < FileContent[FileName].size())
+    LineInfo.LineOff = addString(FileContent[FileName][Line]);
+  else
+    LineInfo.LineOff = 0;
+  LineInfo.LineNum = Line;
+  LineInfo.ColumnNum = Column;
+  LineInfoTable[SecNameOff].push_back(LineInfo);
+}
+
+void BTFDebug::emitCommonHeader() {
+  OS.AddComment("0x" + Twine::utohexstr(BTF::MAGIC));
+  OS.EmitIntValue(BTF::MAGIC, 2);
+  OS.EmitIntValue(BTF::VERSION, 1);
+  OS.EmitIntValue(0, 1);
+}
+
+void BTFDebug::emitBTFSection() {
+  MCContext &context = OS.getContext();
+  OS.SwitchSection(context.getObjectFileInfo()->getBTFSection());
+
+  // Emit header.
+  emitCommonHeader();
+  OS.EmitIntValue(BTF::HeaderSize, 4);
+
+  uint32_t TypeLen = 0, StrLen;
+  for (const auto &TypeEntry : TypeEntries)
+    TypeLen += TypeEntry->getSize();
+  StrLen = StringTable.getSize();
+
+  OS.EmitIntValue(0, 4);
+  OS.EmitIntValue(TypeLen, 4);
+  OS.EmitIntValue(TypeLen, 4);
+  OS.EmitIntValue(StrLen, 4);
+
+  // Emit type table.
+  for (const auto &TypeEntry : TypeEntries)
+    TypeEntry->emitType(OS);
+
+  // Emit string table.
+  uint32_t StringOffset = 0;
+  for (const auto &S : StringTable.getTable()) {
+    OS.AddComment("string offset=" + std::to_string(StringOffset));
+    OS.EmitBytes(S);
+    OS.EmitBytes(StringRef("\0", 1));
+    StringOffset += S.size() + 1;
+  }
+}
+
+void BTFDebug::emitBTFExtSection() {
+  MCContext &context = OS.getContext();
+  OS.SwitchSection(context.getObjectFileInfo()->getBTFExtSection());
+
+  // Emit header.
+  emitCommonHeader();
+  OS.EmitIntValue(BTF::ExtHeaderSize, 4);
+
+  // Account for FuncInfo/LineInfo record size as well.
+  uint32_t FuncLen = 4, LineLen = 4;
+  for (const auto &FuncSec : FuncInfoTable) {
+    FuncLen += BTF::SecFuncInfoSize;
+    FuncLen += FuncSec.second.size() * BTF::BPFFuncInfoSize;
+  }
+  for (const auto &LineSec : LineInfoTable) {
+    LineLen += BTF::SecLineInfoSize;
+    LineLen += LineSec.second.size() * BTF::BPFLineInfoSize;
+  }
+
+  OS.EmitIntValue(0, 4);
+  OS.EmitIntValue(FuncLen, 4);
+  OS.EmitIntValue(FuncLen, 4);
+  OS.EmitIntValue(LineLen, 4);
+
+  // Emit func_info table.
+  OS.AddComment("FuncInfo");
+  OS.EmitIntValue(BTF::BPFFuncInfoSize, 4);
+  for (const auto &FuncSec : FuncInfoTable) {
+    OS.AddComment("FuncInfo section string offset=" +
+                  std::to_string(FuncSec.first));
+    OS.EmitIntValue(FuncSec.first, 4);
+    OS.EmitIntValue(FuncSec.second.size(), 4);
+    for (const auto &FuncInfo : FuncSec.second) {
+      Asm->EmitLabelReference(FuncInfo.Label, 4);
+      OS.EmitIntValue(FuncInfo.TypeId, 4);
+    }
+  }
+
+  // Emit line_info table.
+  OS.AddComment("LineInfo");
+  OS.EmitIntValue(BTF::BPFLineInfoSize, 4);
+  for (const auto &LineSec : LineInfoTable) {
+    OS.AddComment("LineInfo section string offset=" +
+                  std::to_string(LineSec.first));
+    OS.EmitIntValue(LineSec.first, 4);
+    OS.EmitIntValue(LineSec.second.size(), 4);
+    for (const auto &LineInfo : LineSec.second) {
+      Asm->EmitLabelReference(LineInfo.Label, 4);
+      OS.EmitIntValue(LineInfo.FileNameOff, 4);
+      OS.EmitIntValue(LineInfo.LineOff, 4);
+      OS.AddComment("Line " + std::to_string(LineInfo.LineNum) + " Col " +
+                    std::to_string(LineInfo.ColumnNum));
+      OS.EmitIntValue(LineInfo.LineNum << 10 | LineInfo.ColumnNum, 4);
+    }
+  }
+}
+
+void BTFDebug::beginFunctionImpl(const MachineFunction *MF) {
+  auto *SP = MF->getFunction().getSubprogram();
+  auto *Unit = SP->getUnit();
+
+  if (Unit->getEmissionKind() == DICompileUnit::NoDebug) {
+    SkipInstruction = true;
+    return;
+  }
+  SkipInstruction = false;
+
+  // Collect all types locally referenced in this function.
+  // Use RetainedNodes so we can collect all argument names
+  // even if the argument is not used.
+  std::unordered_map<uint32_t, StringRef> FuncArgNames;
+  for (const DINode *DN : SP->getRetainedNodes()) {
+    if (const auto *DV = dyn_cast<DILocalVariable>(DN)) {
+      visitTypeEntry(DV->getType().resolve());
+
+      // Collect function arguments for subprogram func type.
+      uint32_t Arg = DV->getArg();
+      if (Arg)
+        FuncArgNames[Arg] = DV->getName();
+    }
+  }
+
+  // Construct subprogram func proto type.
+  uint32_t ProtoTypeId;
+  visitSubroutineType(SP->getType(), true, FuncArgNames, ProtoTypeId);
+
+  // Construct subprogram func type
+  auto FuncTypeEntry =
+      llvm::make_unique<BTFTypeFunc>(SP->getName(), ProtoTypeId);
+  uint32_t FuncTypeId = addType(std::move(FuncTypeEntry));
+
+  // Construct funcinfo and the first lineinfo for the function.
+  MCSymbol *FuncLabel = Asm->getFunctionBegin();
+  BTFFuncInfo FuncInfo;
+  FuncInfo.Label = FuncLabel;
+  FuncInfo.TypeId = FuncTypeId;
+  if (FuncLabel->isInSection()) {
+    MCSection &Section = FuncLabel->getSection();
+    const MCSectionELF *SectionELF = dyn_cast<MCSectionELF>(&Section);
+    assert(SectionELF && "Null section for Function Label");
+    SecNameOff = addString(SectionELF->getSectionName());
+  } else {
+    SecNameOff = addString(".text");
+  }
+  FuncInfoTable[SecNameOff].push_back(FuncInfo);
+}
+
+void BTFDebug::endFunctionImpl(const MachineFunction *MF) {
+  SkipInstruction = false;
+  LineInfoGenerated = false;
+  SecNameOff = 0;
+}
+
+void BTFDebug::beginInstruction(const MachineInstr *MI) {
+  DebugHandlerBase::beginInstruction(MI);
+
+  if (SkipInstruction || MI->isMetaInstruction() ||
+      MI->getFlag(MachineInstr::FrameSetup))
+    return;
+
+  if (MI->isInlineAsm()) {
+    // Count the number of register definitions to find the asm string.
+    unsigned NumDefs = 0;
+    for (; MI->getOperand(NumDefs).isReg() && MI->getOperand(NumDefs).isDef();
+         ++NumDefs)
+      ;
+
+    // Skip this inline asm instruction if the asmstr is empty.
+    const char *AsmStr = MI->getOperand(NumDefs).getSymbolName();
+    if (AsmStr[0] == 0)
+      return;
+  }
+
+  // Skip this instruction if no DebugLoc or the DebugLoc
+  // is the same as the previous instruction.
+  const DebugLoc &DL = MI->getDebugLoc();
+  if (!DL || PrevInstLoc == DL) {
+    // This instruction will be skipped, no LineInfo has
+    // been generated, construct one based on function signature.
+    if (LineInfoGenerated == false) {
+      auto *S = MI->getMF()->getFunction().getSubprogram();
+      MCSymbol *FuncLabel = Asm->getFunctionBegin();
+      constructLineInfo(S, FuncLabel, S->getLine(), 0);
+      LineInfoGenerated = true;
+    }
+
+    return;
+  }
+
+  // Create a temporary label to remember the insn for lineinfo.
+  MCSymbol *LineSym = OS.getContext().createTempSymbol();
+  OS.EmitLabel(LineSym);
+
+  // Construct the lineinfo.
+  auto SP = DL.get()->getScope()->getSubprogram();
+  constructLineInfo(SP, LineSym, DL.getLine(), DL.getCol());
+
+  LineInfoGenerated = true;
+  PrevInstLoc = DL;
+}
+
+void BTFDebug::endModule() {
+  // Collect all types referenced by globals.
+  const Module *M = MMI->getModule();
+  for (const DICompileUnit *CUNode : M->debug_compile_units()) {
+    for (const auto *GVE : CUNode->getGlobalVariables()) {
+      DIGlobalVariable *GV = GVE->getVariable();
+      visitTypeEntry(GV->getType().resolve());
+    }
+  }
+
+  // Complete BTF type cross refereences.
+  for (const auto &TypeEntry : TypeEntries)
+    TypeEntry->completeType(*this);
+
+  // Emit BTF sections.
+  emitBTFSection();
+  emitBTFExtSection();
+}

lib/Target/BPF/CMakeLists.txt

add_llvm_target(BPFCodeGen
   BPFISelLowering.cpp
   BPFMCInstLower.cpp
   BPFRegisterInfo.cpp
   BPFSelectionDAGInfo.cpp
   BPFSubtarget.cpp
   BPFTargetMachine.cpp
   BPFMIPeephole.cpp
   BPFMIChecking.cpp
+  BTFDebug.cpp
   )
 
 add_subdirectory(AsmParser)
 add_subdirectory(Disassembler)
 add_subdirectory(InstPrinter)
 add_subdirectory(MCTargetDesc)
 add_subdirectory(TargetInfo)

test/CodeGen/BPF/BTF/array-1d-char.ll

+; RUN: llc -march=bpfel -filetype=asm -o - %s | FileCheck -check-prefixes=CHECK %s
+; RUN: llc -march=bpfeb -filetype=asm -o - %s | FileCheck -check-prefixes=CHECK %s
+
+; Source code:
+;   char a[10];
+; Compilation flag:
+;   clang -target bpf -O2 -g -S -emit-llvm t.c
+
+@a = common dso_local local_unnamed_addr global [10 x i8] zeroinitializer, align 1, !dbg !0
+
+!llvm.dbg.cu = !{!2}
+!llvm.module.flags = !{!10, !11, !12}
+!llvm.ident = !{!13}
+
+; CHECK:             .section        .BTF,"",@progbits
+; CHECK-NEXT:        .short  60319                   # 0xeb9f
+; CHECK-NEXT:        .byte   1
+; CHECK-NEXT:        .byte   0
+; CHECK-NEXT:        .long   24
+; CHECK-NEXT:        .long   0
+; CHECK-NEXT:        .long   56
+; CHECK-NEXT:        .long   56
+; CHECK-NEXT:        .long   26
+; CHECK-NEXT:        .long   0                       # BTF_KIND_ARRAY(id = 1)
+; CHECK-NEXT:        .long   50331648                # 0x3000000
+; CHECK-NEXT:        .long   0
+; CHECK-NEXT:        .long   3
+; CHECK-NEXT:        .long   2
+; CHECK-NEXT:        .long   10
+; CHECK-NEXT:        .long   1                       # BTF_KIND_INT(id = 2)
+; CHECK-NEXT:        .long   16777216                # 0x1000000
+; CHECK-NEXT:        .long   4
+; CHECK-NEXT:        .long   32                      # 0x20
+; CHECK-NEXT:        .long   21                      # BTF_KIND_INT(id = 3)
+; CHECK-NEXT:        .long   16777216                # 0x1000000
+; CHECK-NEXT:        .long   1
+; CHECK-NEXT:        .long   16777224                # 0x1000008
+; CHECK-NEXT:        .byte   0                       # string offset=0
+; CHECK-NEXT:        .ascii  "__ARRAY_SIZE_TYPE__"   # string offset=1
+; CHECK-NEXT:        .byte   0
+; CHECK-NEXT:        .ascii  "char"                  # string offset=21
+; CHECK-NEXT:        .byte   0
+; CHECK-NEXT:        .section        .BTF.ext,"",@progbits
+; CHECK-NEXT:        .short  60319                   # 0xeb9f
+; CHECK-NEXT:        .byte   1
+; CHECK-NEXT:        .byte   0
+; CHECK-NEXT:        .long   24
+; CHECK-NEXT:        .long   0
+; CHECK-NEXT:        .long   4
+; CHECK-NEXT:        .long   4
+; CHECK-NEXT:        .long   4
+; CHECK-NEXT:        .long   8                       # FuncInfo
+; CHECK-NEXT:        .long   16                      # LineInfo
+
+!0 = !DIGlobalVariableExpression(var: !1, expr: !DIExpression())
+!1 = distinct !DIGlobalVariable(name: "a", scope: !2, file: !3, line: 1, type: !6, isLocal: false, isDefinition: true)
+!2 = distinct !DICompileUnit(language: DW_LANG_C99, file: !3, producer: "clang version 8.0.0 (trunk 345296) (llvm/trunk 345297)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !4, globals: !5, nameTableKind: None)
+!3 = !DIFile(filename: "t.c", directory: "/home/yhs/tmp")
+!4 = !{}
+!5 = !{!0}
+!6 = !DICompositeType(tag: DW_TAG_array_type, baseType: !7, size: 80, elements: !8)
+!7 = !DIBasicType(name: "char", size: 8, encoding: DW_ATE_signed_char)
+!8 = !{!9}
+!9 = !DISubrange(count: 10)
+!10 = !{i32 2, !"Dwarf Version", i32 4}
+!11 = !{i32 2, !"Debug Info Version", i32 3}
+!12 = !{i32 1, !"wchar_size", i32 4}
+!13 = !{!"clang version 8.0.0 (trunk 345296) (llvm/trunk 345297)"}

test/CodeGen/BPF/BTF/array-1d-int.ll

+; RUN: llc -march=bpfel -filetype=asm -o - %s | FileCheck -check-prefixes=CHECK %s
+; RUN: llc -march=bpfeb -filetype=asm -o - %s | FileCheck -check-prefixes=CHECK %s
+
+; Source code:
+;   int a[10];
+; Compilation flag:
+;   clang -target bpf -O2 -g -S -emit-llvm t.c
+
+@a = common dso_local local_unnamed_addr global [10 x i32] zeroinitializer, align 4, !dbg !0
+
+!llvm.dbg.cu = !{!2}
+!llvm.module.flags = !{!10, !11, !12}
+!llvm.ident = !{!13}
+
+; CHECK:             .section        .BTF,"",@progbits
+; CHECK-NEXT:        .short  60319                   # 0xeb9f
+; CHECK-NEXT:        .byte   1
+; CHECK-NEXT:        .byte   0
+; CHECK-NEXT:        .long   24
+; CHECK-NEXT:        .long   0
+; CHECK-NEXT:        .long   56
+; CHECK-NEXT:        .long   56
+; CHECK-NEXT:        .long   25
+; CHECK-NEXT:        .long   0                       # BTF_KIND_ARRAY(id = 1)
+; CHECK-NEXT:        .long   50331648                # 0x3000000
+; CHECK-NEXT:        .long   0
+; CHECK-NEXT:        .long   3
+; CHECK-NEXT:        .long   2
+; CHECK-NEXT:        .long   10
+; CHECK-NEXT:        .long   1                       # BTF_KIND_INT(id = 2)
+; CHECK-NEXT:        .long   16777216                # 0x1000000
+; CHECK-NEXT:        .long   4
+; CHECK-NEXT:        .long   32                      # 0x20
+; CHECK-NEXT:        .long   21                      # BTF_KIND_INT(id = 3)
+; CHECK-NEXT:        .long   16777216                # 0x1000000
+; CHECK-NEXT:        .long   4
+; CHECK-NEXT:        .long   16777248                # 0x1000020
+; CHECK-NEXT:        .byte   0                       # string offset=0
+; CHECK-NEXT:        .ascii  "__ARRAY_SIZE_TYPE__"   # string offset=1
+; CHECK-NEXT:        .byte   0
+; CHECK-NEXT:        .ascii  "int"                   # string offset=21
+; CHECK-NEXT:        .byte   0
+; CHECK-NEXT:        .section        .BTF.ext,"",@progbits
+; CHECK-NEXT:        .short  60319                   # 0xeb9f
+; CHECK-NEXT:        .byte   1
+; CHECK-NEXT:        .byte   0
+; CHECK-NEXT:        .long   24
+; CHECK-NEXT:        .long   0
+; CHECK-NEXT:        .long   4
+; CHECK-NEXT:        .long   4
+; CHECK-NEXT:        .long   4
+; CHECK-NEXT:        .long   8                       # FuncInfo
+; CHECK-NEXT:        .long   16                      # LineInfo
+
+!0 = !DIGlobalVariableExpression(var: !1, expr: !DIExpression())
+!1 = distinct !DIGlobalVariable(name: "a", scope: !2, file: !3, line: 1, type: !6, isLocal: false, isDefinition: true)
+!2 = distinct !DICompileUnit(language: DW_LANG_C99, file: !3, producer: "clang version 8.0.0 (trunk 345296) (llvm/trunk 345297)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !4, globals: !5, nameTableKind: None)
+!3 = !DIFile(filename: "t.c", directory: "/home/yhs/tmp")
+!4 = !{}
+!5 = !{!0}
+!6 = !DICompositeType(tag: DW_TAG_array_type, baseType: !7, size: 320, elements: !8)
+!7 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
+!8 = !{!9}
+!9 = !DISubrange(count: 10)
+!10 = !{i32 2, !"Dwarf Version", i32 4}
+!11 = !{i32 2, !"Debug Info Version", i32 3}
+!12 = !{i32 1, !"wchar_size", i32 4}
+!13 = !{!"clang version 8.0.0 (trunk 345296) (llvm/trunk 345297)"}

test/CodeGen/BPF/BTF/array-2d-int.ll

+; RUN: llc -march=bpfel -filetype=asm -o - %s | FileCheck -check-prefixes=CHECK %s
+; RUN: llc -march=bpfeb -filetype=asm -o - %s | FileCheck -check-prefixes=CHECK %s
+
+; Source code:
+;   int a[10][10];
+; Compilation flag:
+;   clang -target bpf -O2 -g -S -emit-llvm t.c
+
+@a = common dso_local local_unnamed_addr global [10 x [10 x i32]] zeroinitializer, align 4, !dbg !0
+
+!llvm.dbg.cu = !{!2}
+!llvm.module.flags = !{!10, !11, !12}
+!llvm.ident = !{!13}
+
+; CHECK:             .section        .BTF,"",@progbits
+; CHECK-NEXT:        .short  60319                   # 0xeb9f
+; CHECK-NEXT:        .byte   1
+; CHECK-NEXT:        .byte   0
+; CHECK-NEXT:        .long   24
+; CHECK-NEXT:        .long   0
+; CHECK-NEXT:        .long   56
+; CHECK-NEXT:        .long   56
+; CHECK-NEXT:        .long   25
+; CHECK-NEXT:        .long   0                       # BTF_KIND_ARRAY(id = 1)
+; CHECK-NEXT:        .long   50331648                # 0x3000000
+; CHECK-NEXT:        .long   0
+; CHECK-NEXT:        .long   3
+; CHECK-NEXT:        .long   2
+; CHECK-NEXT:        .long   100
+; CHECK-NEXT:        .long   1                       # BTF_KIND_INT(id = 2)
+; CHECK-NEXT:        .long   16777216                # 0x1000000
+; CHECK-NEXT:        .long   4
+; CHECK-NEXT:        .long   32                      # 0x20
+; CHECK-NEXT:        .long   21                      # BTF_KIND_INT(id = 3)
+; CHECK-NEXT:        .long   16777216                # 0x1000000
+; CHECK-NEXT:        .long   4
+; CHECK-NEXT:        .long   16777248                # 0x1000020
+; CHECK-NEXT:        .byte   0                       # string offset=0
+; CHECK-NEXT:        .ascii  "__ARRAY_SIZE_TYPE__"   # string offset=1
+; CHECK-NEXT:        .byte   0
+; CHECK-NEXT:        .ascii  "int"                   # string offset=21
+; CHECK-NEXT:        .byte   0
+; CHECK-NEXT:        .section        .BTF.ext,"",@progbits
+; CHECK-NEXT:        .short  60319                   # 0xeb9f
+; CHECK-NEXT:        .byte   1
+; CHECK-NEXT:        .byte   0
+; CHECK-NEXT:        .long   24
+; CHECK-NEXT:        .long   0
+; CHECK-NEXT:        .long   4
+; CHECK-NEXT:        .long   4
+; CHECK-NEXT:        .long   4
+; CHECK-NEXT:        .long   8                       # FuncInfo
+; CHECK-NEXT:        .long   16                      # LineInfo
+
+!0 = !DIGlobalVariableExpression(var: !1, expr: !DIExpression())
+!1 = distinct !DIGlobalVariable(name: "a", scope: !2, file: !3, line: 1, type: !6, isLocal: false, isDefinition: true)
+!2 = distinct !DICompileUnit(language: DW_LANG_C99, file: !3, producer: "clang version 8.0.0 (trunk 345296) (llvm/trunk 345297)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !4, globals: !5, nameTableKind: None)
+!3 = !DIFile(filename: "t.c", directory: "/home/yhs/tmp")
+!4 = !{}
+!5 = !{!0}
+!6 = !DICompositeType(tag: DW_TAG_array_type, baseType: !7, size: 3200, elements: !8)
+!7 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
+!8 = !{!9, !9}
+!9 = !DISubrange(count: 10)
+!10 = !{i32 2, !"Dwarf Version", i32 4}
+!11 = !{i32 2, !"Debug Info Version", i32 3}
+!12 = !{i32 1, !"wchar_size", i32 4}
+!13 = !{!"clang version 8.0.0 (trunk 345296) (llvm/trunk 345297)"}

test/CodeGen/BPF/BTF/array-size-0.ll

+; RUN: llc -march=bpfel -filetype=asm -o - %s | FileCheck -check-prefixes=CHECK %s
+; RUN: llc -march=bpfeb -filetype=asm -o - %s | FileCheck -check-prefixes=CHECK %s
+
+; Source code:
+;   struct t {};
+;   struct t a[10];
+; Compilation flag:
+;   clang -target bpf -O2 -g -S -emit-llvm t.c
+
+%struct.t = type {}
+
+@a = common dso_local local_unnamed_addr global [10 x %struct.t] zeroinitializer, align 1, !dbg !0
+
+!llvm.dbg.cu = !{!2}
+!llvm.module.flags = !{!10, !11, !12}
+!llvm.ident = !{!13}
+
+; CHECK:             .section        .BTF,"",@progbits
+; CHECK-NEXT:        .short  60319                   # 0xeb9f
+; CHECK-NEXT:        .byte   1
+; CHECK-NEXT:        .byte   0
+; CHECK-NEXT:        .long   24
+; CHECK-NEXT:        .long   0
+; CHECK-NEXT:        .long   52
+; CHECK-NEXT:        .long   52
+; CHECK-NEXT:        .long   23
+; CHECK-NEXT:        .long   0                       # BTF_KIND_ARRAY(id = 1)
+; CHECK-NEXT:        .long   50331648                # 0x3000000
+; CHECK-NEXT:        .long   0
+; CHECK-NEXT:        .long   3
+; CHECK-NEXT:        .long   2
+; CHECK-NEXT:        .long   0
+; CHECK-NEXT:        .long   1                       # BTF_KIND_INT(id = 2)
+; CHECK-NEXT:        .long   16777216                # 0x1000000
+; CHECK-NEXT:        .long   4
+; CHECK-NEXT:        .long   32                      # 0x20
+; CHECK-NEXT:        .long   21                      # BTF_KIND_STRUCT(id = 3)
+; CHECK-NEXT:        .long   67108864                # 0x4000000
+; CHECK-NEXT:        .long   0
+; CHECK-NEXT:        .byte   0                       # string offset=0
+; CHECK-NEXT:        .ascii  "__ARRAY_SIZE_TYPE__"   # string offset=1
+; CHECK-NEXT:        .byte   0
+; CHECK-NEXT:        .byte   116                     # string offset=21
+; CHECK-NEXT:        .byte   0
+; CHECK-NEXT:        .section        .BTF.ext,"",@progbits
+; CHECK-NEXT:        .short  60319                   # 0xeb9f
+; CHECK-NEXT:        .byte   1
+; CHECK-NEXT:        .byte   0
+; CHECK-NEXT:        .long   24
+; CHECK-NEXT:        .long   0
+; CHECK-NEXT:        .long   4
+; CHECK-NEXT:        .long   4
+; CHECK-NEXT:        .long   4
+; CHECK-NEXT:        .long   8                       # FuncInfo
+; CHECK-NEXT:        .long   16                      # LineInfo
+
+!0 = !DIGlobalVariableExpression(var: !1, expr: !DIExpression())
+!1 = distinct !DIGlobalVariable(name: "a", scope: !2, file: !3, line: 2, type: !6, isLocal: false, isDefinition: true)
+!2 = distinct !DICompileUnit(language: DW_LANG_C99, file: !3, producer: "clang version 8.0.0 (trunk 345296) (llvm/trunk 345297)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !4, globals: !5, nameTableKind: None)
+!3 = !DIFile(filename: "t.c", directory: "/home/yhs/tmp")
+!4 = !{}
+!5 = !{!0}
+!6 = !DICompositeType(tag: DW_TAG_array_type, baseType: !7, elements: !8)
+!7 = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "t", file: !3, line: 1, elements: !4)
+!8 = !{!9}
+!9 = !DISubrange(count: 10)
+!10 = !{i32 2, !"Dwarf Version", i32 4}
+!11 = !{i32 2, !"Debug Info Version", i32 3}
+!12 = !{i32 1, !"wchar_size", i32 4}
+!13 = !{!"clang version 8.0.0 (trunk 345296) (llvm/trunk 345297)"}

test/CodeGen/BPF/BTF/array-typedef.ll

+; RUN: llc -march=bpfel -filetype=asm -o - %s | FileCheck -check-prefixes=CHECK %s
+; RUN: llc -march=bpfeb -filetype=asm -o - %s | FileCheck -check-prefixes=CHECK %s
+
+; Source code:
+;   typedef unsigned _int;
+;   typedef _int __int;
+;   __int a[10];
+; Compilation flag:
+;   clang -target bpf -O2 -g -S -emit-llvm t.c
+
+@a = common dso_local local_unnamed_addr global [10 x i32] zeroinitializer, align 4, !dbg !0
+
+!llvm.dbg.cu = !{!2}
+!llvm.module.flags = !{!12, !13, !14}
+!llvm.ident = !{!15}
+
+; CHECK:             .section        .BTF,"",@progbits
+; CHECK-NEXT:        .short  60319                   # 0xeb9f
+; CHECK-NEXT:        .byte   1
+; CHECK-NEXT:        .byte   0
+; CHECK-NEXT:        .long   24
+; CHECK-NEXT:        .long   0
+; CHECK-NEXT:        .long   80
+; CHECK-NEXT:        .long   80
+; CHECK-NEXT:        .long   45
+; CHECK-NEXT:        .long   0                       # BTF_KIND_ARRAY(id = 1)
+; CHECK-NEXT:        .long   50331648                # 0x3000000
+; CHECK-NEXT:        .long   0
+; CHECK-NEXT:        .long   3
+; CHECK-NEXT:        .long   2
+; CHECK-NEXT:        .long   10
+; CHECK-NEXT:        .long   1                       # BTF_KIND_INT(id = 2)
+; CHECK-NEXT:        .long   16777216                # 0x1000000
+; CHECK-NEXT:        .long   4
+; CHECK-NEXT:        .long   32                      # 0x20
+; CHECK-NEXT:        .long   21                      # BTF_KIND_TYPEDEF(id = 3)
+; CHECK-NEXT:        .long   134217728               # 0x8000000
+; CHECK-NEXT:        .long   4
+; CHECK-NEXT:        .long   27                      # BTF_KIND_TYPEDEF(id = 4)
+; CHECK-NEXT:        .long   134217728               # 0x8000000
+; CHECK-NEXT:        .long   5
+; CHECK-NEXT:        .long   32                      # BTF_KIND_INT(id = 5)
+; CHECK-NEXT:        .long   16777216                # 0x1000000
+; CHECK-NEXT:        .long   4
+; CHECK-NEXT:        .long   32                      # 0x20
+; CHECK-NEXT:        .byte   0                       # string offset=0
+; CHECK-NEXT:        .ascii  "__ARRAY_SIZE_TYPE__"   # string offset=1
+; CHECK-NEXT:        .byte   0
+; CHECK-NEXT:        .ascii  "__int"                 # string offset=21
+; CHECK-NEXT:        .byte   0
+; CHECK-NEXT:        .ascii  "_int"                  # string offset=27
+; CHECK-NEXT:        .byte   0
+; CHECK-NEXT:        .ascii  "unsigned int"          # string offset=32
+; CHECK-NEXT:        .byte   0
+; CHECK-NEXT:        .section        .BTF.ext,"",@progbits
+; CHECK-NEXT:        .short  60319                   # 0xeb9f
+; CHECK-NEXT:        .byte   1
+; CHECK-NEXT:        .byte   0
+; CHECK-NEXT:        .long   24
+; CHECK-NEXT:        .long   0
+; CHECK-NEXT:        .long   4
+; CHECK-NEXT:        .long   4
+; CHECK-NEXT:        .long   4
+; CHECK-NEXT:        .long   8                       # FuncInfo
+; CHECK-NEXT:        .long   16                      # LineInfo
+
+!0 = !DIGlobalVariableExpression(var: !1, expr: !DIExpression())
+!1 = distinct !DIGlobalVariable(name: "a", scope: !2, file: !3, line: 3, type: !6, isLocal: false, isDefinition: true)
+!2 = distinct !DICompileUnit(language: DW_LANG_C99, file: !3, producer: "clang version 8.0.0 (trunk 345296) (llvm/trunk 345297)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !4, globals: !5, nameTableKind: None)
+!3 = !DIFile(filename: "t.c", directory: "/home/yhs/tmp")
+!4 = !{}
+!5 = !{!0}
+!6 = !DICompositeType(tag: DW_TAG_array_type, baseType: !7, size: 320, elements: !10)
+!7 = !DIDerivedType(tag: DW_TAG_typedef, name: "__int", file: !3, line: 2, baseType: !8)
+!8 = !DIDerivedType(tag: DW_TAG_typedef, name: "_int", file: !3, line: 1, baseType: !9)
+!9 = !DIBasicType(name: "unsigned int", size: 32, encoding: DW_ATE_unsigned)
+!10 = !{!11}
+!11 = !DISubrange(count: 10)
+!12 = !{i32 2, !"Dwarf Version", i32 4}
+!13 = !{i32 2, !"Debug Info Version", i32 3}
+!14 = !{i32 1, !"wchar_size", i32 4}
+!15 = !{!"clang version 8.0.0 (trunk 345296) (llvm/trunk 345297)"}

test/CodeGen/BPF/BTF/binary-format.ll

+; RUN: llc -march=bpfel -filetype=obj -o - %s | llvm-readelf -x ".BTF" -x ".BTF.ext" | FileCheck -check-prefixes=CHECK,CHECK-EL %s
+; RUN: llc -march=bpfeb -filetype=obj -o - %s | llvm-readelf -x ".BTF" -x ".BTF.ext" | FileCheck -check-prefixes=CHECK,CHECK-EB %s
+
+; Source code:
+;   int f(int a) { return a; }
+; Compilation flag:
+;   clang -target bpf -O2 -g -gdwarf-5 -gembed-source -S -emit-llvm t.c
+
+; Function Attrs: nounwind readnone
+define dso_local i32 @f(i32 returned %a) local_unnamed_addr #0 !dbg !7 {
+entry:
+  call void @llvm.dbg.value(metadata i32 %a, metadata !12, metadata !DIExpression()), !dbg !13
+  ret i32 %a, !dbg !14
+}
+
+; CHECK:    '.BTF'
+; CHECK-EL: 0x00000000 9feb0100 18000000 00000000 30000000
+; CHECK-EL: 0x00000010 30000000 33000000 2b000000 00000001
+; CHECK-EL: 0x00000020 04000000 20000001 00000000 0100000d
+; CHECK-EL: 0x00000030 01000000 2f000000 01000000 31000000
+; CHECK-EL: 0x00000040 0000000c 02000000 002e7465 7874002f
+; CHECK-EB: 0x00000000 eb9f0100 00000018 00000000 00000030
+; CHECK-EB: 0x00000010 00000030 00000033 0000002b 01000000
+; CHECK-EB: 0x00000020 00000004 01000020 00000000 0d000001
+; CHECK-EB: 0x00000030 00000001 0000002f 00000001 00000031
+; CHECK-EB: 0x00000040 0c000000 00000002 002e7465 7874002f
+; CHECK:    0x00000050 746d702f 742e6300 696e7420 6628696e
+; CHECK:    0x00000060 74206129 207b2072 65747572 6e20613b
+; CHECK:    0x00000070 207d0069 6e740061 006600
+; CHECK:    '.BTF.ext'
+; CHECK-EL: 0x00000000 9feb0100 18000000 00000000 14000000
+; CHECK-EL: 0x00000010 14000000 2c000000 08000000 01000000
+; CHECK-EL: 0x00000020 01000000 00000000 03000000 10000000
+; CHECK-EL: 0x00000030 01000000 02000000 00000000 07000000
+; CHECK-EL: 0x00000040 10000000 00040000 08000000 07000000
+; CHECK-EL: 0x00000050 10000000 10040000
+; CHECK-EB: 0x00000000 eb9f0100 00000018 00000000 00000014
+; CHECK-EB: 0x00000010 00000014 0000002c 00000008 00000001
+; CHECK-EB: 0x00000020 00000001 00000000 00000003 00000010
+; CHECK-EB: 0x00000030 00000001 00000002 00000000 00000007
+; CHECK-EB: 0x00000040 00000010 00000400 00000008 00000007
+; CHECK-EB: 0x00000050 00000010 00000410
+
+; Function Attrs: nounwind readnone speculatable
+declare void @llvm.dbg.value(metadata, metadata, metadata) #1
+
+attributes #0 = { nounwind readnone "correctly-rounded-divide-sqrt-fp-math"="false" "disable-tail-calls"="false" "less-precise-fpmad"="false" "no-frame-pointer-elim"="true" "no-frame-pointer-elim-non-leaf" "no-infs-fp-math"="false" "no-jump-tables"="false" "no-nans-fp-math"="false" "no-signed-zeros-fp-math"="false" "no-trapping-math"="false" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" }
+attributes #1 = { nounwind readnone speculatable }
+
+!llvm.dbg.cu = !{!0}
+!llvm.module.flags = !{!3, !4, !5}
+!llvm.ident = !{!6}
+
+!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 8.0.0 (trunk 344789) (llvm/trunk 344782)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, nameTableKind: None)
+!1 = !DIFile(filename: "t.c", directory: "/tmp", checksumkind: CSK_MD5, checksum: "1924f0d78deb326ceb76cd8e9f450775", source: "int f(int a) { return a; }\0A")
+!2 = !{}
+!3 = !{i32 2, !"Dwarf Version", i32 5}
+!4 = !{i32 2, !"Debug Info Version", i32 3}
+!5 = !{i32 1, !"wchar_size", i32 4}
+!6 = !{!"clang version 8.0.0 (trunk 344789) (llvm/trunk 344782)"}
+!7 = distinct !DISubprogram(name: "f", scope: !1, file: !1, line: 1, type: !8, isLocal: false, isDefinition: true, scopeLine: 1, flags: DIFlagPrototyped | DIFlagAllCallsDescribed, isOptimized: true, unit: !0, retainedNodes: !11)
+!8 = !DISubroutineType(types: !9)
+!9 = !{!10, !10}
+!10 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
+!11 = !{!12}
+!12 = !DILocalVariable(name: "a", arg: 1, scope: !7, file: !1, line: 1, type: !10)
+!13 = !DILocation(line: 1, column: 11, scope: !7)
+!14 = !DILocation(line: 1, column: 16, scope: !7)

test/CodeGen/BPF/BTF/char.ll

+; RUN: llc -march=bpfel -filetype=asm -o - %s | FileCheck -check-prefixes=CHECK %s
+; RUN: llc -march=bpfeb -filetype=asm -o - %s | FileCheck -check-prefixes=CHECK %s
+
+; Source code:
+;   char a;
+; Compilation flag:
+;   clang -target bpf -O2 -g -S -emit-llvm t.c
+
+@a = common dso_local local_unnamed_addr global i8 0, align 1, !dbg !0
+
+!llvm.dbg.cu = !{!2}
+!llvm.module.flags = !{!7, !8, !9}
+!llvm.ident = !{!10}
+
+; CHECK:             .section        .BTF,"",@progbits
+; CHECK-NEXT:        .short  60319                   # 0xeb9f
+; CHECK-NEXT:        .byte   1
+; CHECK-NEXT:        .byte   0
+; CHECK-NEXT:        .long   24
+; CHECK-NEXT:        .long   0
+; CHECK-NEXT:        .long   16
+; CHECK-NEXT:        .long   16
+; CHECK-NEXT:        .long   6
+; CHECK-NEXT:        .long   1                       # BTF_KIND_INT(id = 1)
+; CHECK-NEXT:        .long   16777216                # 0x1000000
+; CHECK-NEXT:        .long   1
+; CHECK-NEXT:        .long   16777224                # 0x1000008
+; CHECK-NEXT:        .byte   0                       # string offset=0
+; CHECK-NEXT:        .ascii  "char"                  # string offset=1
+; CHECK-NEXT:        .byte   0
+; CHECK-NEXT:        .section        .BTF.ext,"",@progbits
+; CHECK-NEXT:        .short  60319                   # 0xeb9f
+; CHECK-NEXT:        .byte   1
+; CHECK-NEXT:        .byte   0
+; CHECK-NEXT:        .long   24
+; CHECK-NEXT:        .long   0
+; CHECK-NEXT:        .long   4
+; CHECK-NEXT:        .long   4
+; CHECK-NEXT:        .long   4
+; CHECK-NEXT:        .long   8                       # FuncInfo
+; CHECK-NEXT:        .long   16                      # LineInfo
+
+!0 = !DIGlobalVariableExpression(var: !1, expr: !DIExpression())
+!1 = distinct !DIGlobalVariable(name: "a", scope: !2, file: !3, line: 1, type: !6, isLocal: false, isDefinition: true)
+!2 = distinct !DICompileUnit(language: DW_LANG_C99, file: !3, producer: "clang version 8.0.0 (trunk 344789) (llvm/trunk 344782)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !4, globals: !5, nameTableKind: None)
+!3 = !DIFile(filename: "t.c", directory: "/home/yhs/tmp")
+!4 = !{}
+!5 = !{!0}
+!6 = !DIBasicType(name: "char", size: 8, encoding: DW_ATE_signed_char)
+!7 = !{i32 2, !"Dwarf Version", i32 4}
+!8 = !{i32 2, !"Debug Info Version", i32 3}
+!9 = !{i32 1, !"wchar_size", i32 4}
+!10 = !{!"clang version 8.0.0 (trunk 344789) (llvm/trunk 344782)"}

test/CodeGen/BPF/BTF/enum-basic.ll

+; RUN: llc -march=bpfel -filetype=asm -o - %s | FileCheck -check-prefixes=CHECK %s
+; RUN: llc -march=bpfeb -filetype=asm -o - %s | FileCheck -check-prefixes=CHECK %s
+
+; Source code:
+;   enum { A = -1, B = 2 } a;
+; Compilation flag:
+;   clang -target bpf -O2 -g -S -emit-llvm t.c
+
+@a = common dso_local local_unnamed_addr global i32 0, align 4, !dbg !0
+
+!llvm.dbg.cu = !{!2}
+!llvm.module.flags = !{!11, !12, !13}
+!llvm.ident = !{!14}
+
+; CHECK:             .section        .BTF,"",@progbits
+; CHECK-NEXT:        .short  60319                   # 0xeb9f
+; CHECK-NEXT:        .byte   1
+; CHECK-NEXT:        .byte   0
+; CHECK-NEXT:        .long   24
+; CHECK-NEXT:        .long   0
+; CHECK-NEXT:        .long   28
+; CHECK-NEXT:        .long   28
+; CHECK-NEXT:        .long   5
+; CHECK-NEXT:        .long   0                       # BTF_KIND_ENUM(id = 1)
+; CHECK-NEXT:        .long   100663298               # 0x6000002
+; CHECK-NEXT:        .long   4
+; CHECK-NEXT:        .long   1
+; CHECK-NEXT:        .long   -1
+; CHECK-NEXT:        .long   3
+; CHECK-NEXT:        .long   2
+; CHECK-NEXT:        .byte   0                       # string offset=0
+; CHECK-NEXT:        .byte   65                      # string offset=1
+; CHECK-NEXT:        .byte   0
+; CHECK-NEXT:        .byte   66                      # string offset=3
+; CHECK-NEXT:        .byte   0
+; CHECK-NEXT:        .section        .BTF.ext,"",@progbits
+; CHECK-NEXT:        .short  60319                   # 0xeb9f
+; CHECK-NEXT:        .byte   1
+; CHECK-NEXT:        .byte   0
+; CHECK-NEXT:        .long   24
+; CHECK-NEXT:        .long   0
+; CHECK-NEXT:        .long   4
+; CHECK-NEXT:        .long   4
+; CHECK-NEXT:        .long   4
+; CHECK-NEXT:        .long   8                       # FuncInfo
+; CHECK-NEXT:        .long   16                      # LineInfo
+
+!0 = !DIGlobalVariableExpression(var: !1, expr: !DIExpression())
+!1 = distinct !DIGlobalVariable(name: "a", scope: !2, file: !3, line: 1, type: !5, isLocal: false, isDefinition: true)
+!2 = distinct !DICompileUnit(language: DW_LANG_C99, file: !3, producer: "clang version 8.0.0 (trunk 344789) (llvm/trunk 344782)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !4, globals: !10, nameTableKind: None)
+!3 = !DIFile(filename: "t.c", directory: "/home/yhs/tmp")
+!4 = !{!5}
+!5 = !DICompositeType(tag: DW_TAG_enumeration_type, file: !3, line: 1, baseType: !6, size: 32, elements: !7)
+!6 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
+!7 = !{!8, !9}
+!8 = !DIEnumerator(name: "A", value: -1)
+!9 = !DIEnumerator(name: "B", value: 2)
+!10 = !{!0}
+!11 = !{i32 2, !"Dwarf Version", i32 4}
+!12 = !{i32 2, !"Debug Info Version", i32 3}
+!13 = !{i32 1, !"wchar_size", i32 4}
+!14 = !{!"clang version 8.0.0 (trunk 344789) (llvm/trunk 344782)"}

test/CodeGen/BPF/BTF/func-func-ptr.ll

+; RUN: llc -march=bpfel -filetype=asm -o - %s | FileCheck -check-prefixes=CHECK %s
+; RUN: llc -march=bpfeb -filetype=asm -o - %s | FileCheck -check-prefixes=CHECK %s
+
+; Source code:
+;   void (*a1)(int p1);
+;   struct t1 { void (*a1)(int p1); } b1;
+;   void f1(int p2) { }
+; Compilation flag:
+;   clang -target bpf -O2 -g -S -emit-llvm t.c
+
+%struct.t1 = type { void (i32)* }
+
+@a1 = common dso_local local_unnamed_addr global void (i32)* null, align 8, !dbg !0
+@b1 = common dso_local local_unnamed_addr global %struct.t1 zeroinitializer, align 8, !dbg !6
+
+; Function Attrs: nounwind readnone
+define dso_local void @f1(i32 %p2) local_unnamed_addr #0 !dbg !19 {
+entry:
+  call void @llvm.dbg.value(metadata i32 %p2, metadata !21, metadata !DIExpression()), !dbg !22
+  ret void, !dbg !23
+}
+
+; CHECK:             .section        .BTF,"",@progbits
+; CHECK-NEXT:        .short  60319                   # 0xeb9f
+; CHECK-NEXT:        .byte   1
+; CHECK-NEXT:        .byte   0
+; CHECK-NEXT:        .long   24
+; CHECK-NEXT:        .long   0
+; CHECK-NEXT:        .long   104
+; CHECK-NEXT:        .long   104
+; CHECK-NEXT:        .long   32
+; CHECK-NEXT:        .long   16                      # BTF_KIND_INT(id = 1)
+; CHECK-NEXT:        .long   16777216                # 0x1000000
+; CHECK-NEXT:        .long   4
+; CHECK-NEXT:        .long   16777248                # 0x1000020
+; CHECK-NEXT:        .long   0                       # BTF_KIND_FUNC_PROTO(id = 2)
+; CHECK-NEXT:        .long   218103809               # 0xd000001
+; CHECK-NEXT:        .long   0
+; CHECK-NEXT:        .long   20
+; CHECK-NEXT:        .long   1
+; CHECK-NEXT:        .long   23                      # BTF_KIND_FUNC(id = 3)
+; CHECK-NEXT:        .long   201326592               # 0xc000000
+; CHECK-NEXT:        .long   2
+; CHECK-NEXT:        .long   0                       # BTF_KIND_PTR(id = 4)
+; CHECK-NEXT:        .long   33554432                # 0x2000000
+; CHECK-NEXT:        .long   5
+; CHECK-NEXT:        .long   0                       # BTF_KIND_FUNC_PROTO(id = 5)
+; CHECK-NEXT:        .long   218103809               # 0xd000001
+; CHECK-NEXT:        .long   0
+; CHECK-NEXT:        .long   0
+; CHECK-NEXT:        .long   1
+; CHECK-NEXT:        .long   26                      # BTF_KIND_STRUCT(id = 6)
+; CHECK-NEXT:        .long   67108865                # 0x4000001
+; CHECK-NEXT:        .long   8
+; CHECK-NEXT:        .long   29
+; CHECK-NEXT:        .long   4
+; CHECK-NEXT:        .long   0
+; CHECK-NEXT:        .byte   0                       # string offset=0
+; CHECK-NEXT:        .ascii  ".text"                 # string offset=1
+; CHECK-NEXT:        .byte   0
+; CHECK-NEXT:        .ascii  "/tmp/t.c"              # string offset=7
+; CHECK-NEXT:        .byte   0
+; CHECK-NEXT:        .ascii  "int"                   # string offset=16
+; CHECK-NEXT:        .byte   0
+; CHECK-NEXT:        .ascii  "p2"                    # string offset=20
+; CHECK-NEXT:        .byte   0
+; CHECK-NEXT:        .ascii  "f1"                    # string offset=23
+; CHECK-NEXT:        .byte   0
+; CHECK-NEXT:        .ascii  "t1"                    # string offset=26
+; CHECK-NEXT:        .byte   0
+; CHECK-NEXT:        .ascii  "a1"                    # string offset=29
+; CHECK-NEXT:        .byte   0
+; CHECK-NEXT:        .section        .BTF.ext,"",@progbits
+; CHECK-NEXT:        .short  60319                   # 0xeb9f
+; CHECK-NEXT:        .byte   1
+; CHECK-NEXT:        .byte   0
+; CHECK-NEXT:        .long   24
+; CHECK-NEXT:        .long   0
+; CHECK-NEXT:        .long   20
+; CHECK-NEXT:        .long   20
+; CHECK-NEXT:        .long   28
+; CHECK-NEXT:        .long   8                       # FuncInfo
+; CHECK-NEXT:        .long   1                       # FuncInfo section string offset=1
+; CHECK-NEXT:        .long   1
+; CHECK-NEXT:        .long   .Lfunc_begin0
+; CHECK-NEXT:        .long   3
+; CHECK-NEXT:        .long   16                      # LineInfo
+; CHECK-NEXT:        .long   1                       # LineInfo section string offset=1
+; CHECK-NEXT:        .long   1
+; CHECK-NEXT:        .long   .Ltmp{{[0-9]+}}
+; CHECK-NEXT:        .long   7
+; CHECK-NEXT:        .long   0
+; CHECK-NEXT:        .long   3091                    # Line 3 Col 19
+
+; Function Attrs: nounwind readnone speculatable
+declare void @llvm.dbg.value(metadata, metadata, metadata) #1
+
+attributes #0 = { nounwind readnone "correctly-rounded-divide-sqrt-fp-math"="false" "disable-tail-calls"="false" "less-precise-fpmad"="false" "min-legal-vector-width"="0" "no-frame-pointer-elim"="true" "no-frame-pointer-elim-non-leaf" "no-infs-fp-math"="false" "no-jump-tables"="false" "no-nans-fp-math"="false" "no-signed-zeros-fp-math"="false" "no-trapping-math"="false" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" }
+attributes #1 = { nounwind readnone speculatable }
+
+!llvm.dbg.cu = !{!2}
+!llvm.module.flags = !{!15, !16, !17}
+!llvm.ident = !{!18}
+
+!0 = !DIGlobalVariableExpression(var: !1, expr: !DIExpression())
+!1 = distinct !DIGlobalVariable(name: "a1", scope: !2, file: !3, line: 1, type: !11, isLocal: false, isDefinition: true)
+!2 = distinct !DICompileUnit(language: DW_LANG_C99, file: !3, producer: "clang version 8.0.0 (trunk 345296) (llvm/trunk 345297)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !4, globals: !5, nameTableKind: None)
+!3 = !DIFile(filename: "t.c", directory: "/tmp")
+!4 = !{}
+!5 = !{!0, !6}
+!6 = !DIGlobalVariableExpression(var: !7, expr: !DIExpression())
+!7 = distinct !DIGlobalVariable(name: "b1", scope: !2, file: !3, line: 2, type: !8, isLocal: false, isDefinition: true)
+!8 = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "t1", file: !3, line: 2, size: 64, elements: !9)
+!9 = !{!10}
+!10 = !DIDerivedType(tag: DW_TAG_member, name: "a1", scope: !8, file: !3, line: 2, baseType: !11, size: 64)
+!11 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !12, size: 64)
+!12 = !DISubroutineType(types: !13)
+!13 = !{null, !14}
+!14 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
+!15 = !{i32 2, !"Dwarf Version", i32 4}
+!16 = !{i32 2, !"Debug Info Version", i32 3}
+!17 = !{i32 1, !"wchar_size", i32 4}
+!18 = !{!"clang version 8.0.0 (trunk 345296) (llvm/trunk 345297)"}
+!19 = distinct !DISubprogram(name: "f1", scope: !3, file: !3, line: 3, type: !12, isLocal: false, isDefinition: true, scopeLine: 3, flags: DIFlagPrototyped, isOptimized: true, unit: !2, retainedNodes: !20)
+!20 = !{!21}
+!21 = !DILocalVariable(name: "p2", arg: 1, scope: !19, file: !3, line: 3, type: !14)
+!22 = !DILocation(line: 3, column: 13, scope: !19)
+!23 = !DILocation(line: 3, column: 19, scope: !19)

test/CodeGen/BPF/BTF/func-non-void.ll

+; RUN: llc -march=bpfel -filetype=asm -o - %s | FileCheck -check-prefixes=CHECK %s
+; RUN: llc -march=bpfeb -filetype=asm -o - %s | FileCheck -check-prefixes=CHECK %s
+
+; Source code:
+;   int f1(int a1) { return a1; }
+; Compilation flag:
+;   clang -target bpf -O2 -g -S -emit-llvm t.c
+
+; Function Attrs: nounwind readnone
+define dso_local i32 @f1(i32 returned) local_unnamed_addr #0 !dbg !7 {
+  call void @llvm.dbg.value(metadata i32 %0, metadata !12, metadata !DIExpression()), !dbg !13
+  ret i32 %0, !dbg !14
+}
+
+; CHECK:             .section        .BTF,"",@progbits
+; CHECK-NEXT:        .short  60319                   # 0xeb9f
+; CHECK-NEXT:        .byte   1
+; CHECK-NEXT:        .byte   0
+; CHECK-NEXT:        .long   24
+; CHECK-NEXT:        .long   0
+; CHECK-NEXT:        .long   48
+; CHECK-NEXT:        .long   48
+; CHECK-NEXT:        .long   26
+; CHECK-NEXT:        .long   16                      # BTF_KIND_INT(id = 1)
+; CHECK-NEXT:        .long   16777216                # 0x1000000
+; CHECK-NEXT:        .long   4
+; CHECK-NEXT:        .long   16777248                # 0x1000020
+; CHECK-NEXT:        .long   0                       # BTF_KIND_FUNC_PROTO(id = 2)
+; CHECK-NEXT:        .long   218103809               # 0xd000001
+; CHECK-NEXT:        .long   1
+; CHECK-NEXT:        .long   20
+; CHECK-NEXT:        .long   1
+; CHECK-NEXT:        .long   23                      # BTF_KIND_FUNC(id = 3)
+; CHECK-NEXT:        .long   201326592               # 0xc000000
+; CHECK-NEXT:        .long   2
+; CHECK-NEXT:        .byte   0                       # string offset=0
+; CHECK-NEXT:        .ascii  ".text"                 # string offset=1
+; CHECK-NEXT:        .byte   0
+; CHECK-NEXT:        .ascii  "/tmp/t.c"              # string offset=7
+; CHECK-NEXT:        .byte   0
+; CHECK-NEXT:        .ascii  "int"                   # string offset=16
+; CHECK-NEXT:        .byte   0
+; CHECK-NEXT:        .ascii  "a1"                    # string offset=20
+; CHECK-NEXT:        .byte   0
+; CHECK-NEXT:        .ascii  "f1"                    # string offset=23
+; CHECK-NEXT:        .byte   0
+; CHECK-NEXT:        .section        .BTF.ext,"",@progbits
+; CHECK-NEXT:        .short  60319                   # 0xeb9f
+; CHECK-NEXT:        .byte   1
+; CHECK-NEXT:        .byte   0
+; CHECK-NEXT:        .long   24
+; CHECK-NEXT:        .long   0
+; CHECK-NEXT:        .long   20
+; CHECK-NEXT:        .long   20
+; CHECK-NEXT:        .long   44
+; CHECK-NEXT:        .long   8                       # FuncInfo
+; CHECK-NEXT:        .long   1                       # FuncInfo section string offset=1
+; CHECK-NEXT:        .long   1
+; CHECK-NEXT:        .long   .Lfunc_begin0
+; CHECK-NEXT:        .long   3
+; CHECK-NEXT:        .long   16                      # LineInfo
+; CHECK-NEXT:        .long   1                       # LineInfo section string offset=1
+; CHECK-NEXT:        .long   2
+; CHECK-NEXT:        .long   .Lfunc_begin0
+; CHECK-NEXT:        .long   7
+; CHECK-NEXT:        .long   0
+; CHECK-NEXT:        .long   1024                    # Line 1 Col 0
+; CHECK-NEXT:        .long   .Ltmp{{[0-9]+}}
+; CHECK-NEXT:        .long   7
+; CHECK-NEXT:        .long   0
+; CHECK-NEXT:        .long   1042                    # Line 1 Col 18
+
+; Function Attrs: nounwind readnone speculatable
+declare void @llvm.dbg.value(metadata, metadata, metadata) #1
+
+attributes #0 = { nounwind readnone "correctly-rounded-divide-sqrt-fp-math"="false" "disable-tail-calls"="false" "less-precise-fpmad"="false" "min-legal-vector-width"="0" "no-frame-pointer-elim"="true" "no-frame-pointer-elim-non-leaf" "no-infs-fp-math"="false" "no-jump-tables"="false" "no-nans-fp-math"="false" "no-signed-zeros-fp-math"="false" "no-trapping-math"="false" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" }
+attributes #1 = { nounwind readnone speculatable }
+
+!llvm.dbg.cu = !{!0}
+!llvm.module.flags = !{!3, !4, !5}
+!llvm.ident = !{!6}
+
+!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 8.0.0 (trunk 345562) (llvm/trunk 345560)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, nameTableKind: None)
+!1 = !DIFile(filename: "t.c", directory: "/tmp")
+!2 = !{}
+!3 = !{i32 2, !"Dwarf Version", i32 4}
+!4 = !{i32 2, !"Debug Info Version", i32 3}
+!5 = !{i32 1, !"wchar_size", i32 4}
+!6 = !{!"clang version 8.0.0 (trunk 345562) (llvm/trunk 345560)"}
+!7 = distinct !DISubprogram(name: "f1", scope: !1, file: !1, line: 1, type: !8, isLocal: false, isDefinition: true, scopeLine: 1, flags: DIFlagPrototyped, isOptimized: true, unit: !0, retainedNodes: !11)
+!8 = !DISubroutineType(types: !9)
+!9 = !{!10, !10}
+!10 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
+!11 = !{!12}
+!12 = !DILocalVariable(name: "a1", arg: 1, scope: !7, file: !1, line: 1, type: !10)
+!13 = !DILocation(line: 1, column: 12, scope: !7)
+!14 = !DILocation(line: 1, column: 18, scope: !7)

test/CodeGen/BPF/BTF/func-source.ll

+; RUN: llc -march=bpfel -filetype=asm -o - %s | FileCheck -check-prefixes=CHECK %s
+; RUN: llc -march=bpfeb -filetype=asm -o - %s | FileCheck -check-prefixes=CHECK %s
+
+; Source code:
+;   void f(void) { }
+; Compilation flag:
+;   clang -target bpf -O2 -g -gdwarf-5 -gembed-source -S -emit-llvm t.c
+;
+; This test embeds the source code in the IR, so the line info should have
+; correct reference to the lines in the string table.
+
+; Function Attrs: norecurse nounwind readnone
+define dso_local void @f() local_unnamed_addr #0 !dbg !7 {
+entry:
+  ret void, !dbg !10
+}
+
+; CHECK:             .section        .BTF,"",@progbits
+; CHECK-NEXT:        .short  60319                   # 0xeb9f
+; CHECK-NEXT:        .byte   1
+; CHECK-NEXT:        .byte   0
+; CHECK-NEXT:        .long   24
+; CHECK-NEXT:        .long   0
+; CHECK-NEXT:        .long   24
+; CHECK-NEXT:        .long   24
+; CHECK-NEXT:        .long   35
+; CHECK-NEXT:        .long   0                       # BTF_KIND_FUNC_PROTO(id = 1)
+; CHECK-NEXT:        .long   218103808               # 0xd000000
+; CHECK-NEXT:        .long   0
+; CHECK-NEXT:        .long   33                      # BTF_KIND_FUNC(id = 2)
+; CHECK-NEXT:        .long   201326592               # 0xc000000
+; CHECK-NEXT:        .long   1
+; CHECK-NEXT:        .byte   0                       # string offset=0
+; CHECK-NEXT:        .ascii  ".text"                 # string offset=1
+; CHECK-NEXT:        .byte   0
+; CHECK-NEXT:        .ascii  "/tmp/t.c"              # string offset=7
+; CHECK-NEXT:        .byte   0
+; CHECK-NEXT:        .ascii  "void f(void) { }"      # string offset=16
+; CHECK-NEXT:        .byte   0
+; CHECK-NEXT:        .byte   102                     # string offset=33
+; CHECK-NEXT:        .byte   0
+; CHECK-NEXT:        .section        .BTF.ext,"",@progbits
+; CHECK-NEXT:        .short  60319                   # 0xeb9f
+; CHECK-NEXT:        .byte   1
+; CHECK-NEXT:        .byte   0
+; CHECK-NEXT:        .long   24
+; CHECK-NEXT:        .long   0
+; CHECK-NEXT:        .long   20
+; CHECK-NEXT:        .long   20
+; CHECK-NEXT:        .long   28
+; CHECK-NEXT:        .long   8                       # FuncInfo
+; CHECK-NEXT:        .long   1                       # FuncInfo section string offset=1
+; CHECK-NEXT:        .long   1
+; CHECK-NEXT:        .long   .Lfunc_begin0
+; CHECK-NEXT:        .long   2
+; CHECK-NEXT:        .long   16                      # LineInfo
+; CHECK-NEXT:        .long   1                       # LineInfo section string offset=1
+; CHECK-NEXT:        .long   1
+; CHECK-NEXT:        .long   .Ltmp{{[0-9]+}}
+; CHECK-NEXT:        .long   7
+; CHECK-NEXT:        .long   16
+; CHECK-NEXT:        .long   1040                    # Line 1 Col 16
+
+attributes #0 = { norecurse nounwind readnone "correctly-rounded-divide-sqrt-fp-math"="false" "disable-tail-calls"="false" "less-precise-fpmad"="false" "no-frame-pointer-elim"="true" "no-frame-pointer-elim-non-leaf" "no-infs-fp-math"="false" "no-jump-tables"="false" "no-nans-fp-math"="false" "no-signed-zeros-fp-math"="false" "no-trapping-math"="false" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" }
+
+!llvm.dbg.cu = !{!0}
+!llvm.module.flags = !{!3, !4, !5}
+!llvm.ident = !{!6}
+
+!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 8.0.0 (trunk 344789) (llvm/trunk 344782)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, nameTableKind: None)
+!1 = !DIFile(filename: "t.c", directory: "/tmp", checksumkind: CSK_MD5, checksum: "978599fafe3a080b456e3d95a3710359", source: "void f(void) { }\0A")
+!2 = !{}
+!3 = !{i32 2, !"Dwarf Version", i32 5}
+!4 = !{i32 2, !"Debug Info Version", i32 3}
+!5 = !{i32 1, !"wchar_size", i32 4}
+!6 = !{!"clang version 8.0.0 (trunk 344789) (llvm/trunk 344782)"}
+!7 = distinct !DISubprogram(name: "f", scope: !1, file: !1, line: 1, type: !8, isLocal: false, isDefinition: true, scopeLine: 1, flags: DIFlagPrototyped | DIFlagAllCallsDescribed, isOptimized: true, unit: !0, retainedNodes: !2)
+!8 = !DISubroutineType(types: !9)
+!9 = !{null}
+!10 = !DILocation(line: 1, column: 16, scope: !7)

test/CodeGen/BPF/BTF/func-typedef.ll

+; RUN: llc -march=bpfel -filetype=asm -o - %s | FileCheck -check-prefixes=CHECK %s
+; RUN: llc -march=bpfeb -filetype=asm -o - %s | FileCheck -check-prefixes=CHECK %s
+
+; Source code:
+;   typedef int _int;
+;   typedef _int __int;
+;   __int f(__int a) { return a; }
+; Compilation flag:
+;   clang -target bpf -O2 -g -S -emit-llvm t.c
+
+; Function Attrs: nounwind readnone
+define dso_local i32 @f(i32 returned %a) local_unnamed_addr #0 !dbg !7 {
+entry:
+  call void @llvm.dbg.value(metadata i32 %a, metadata !14, metadata !DIExpression()), !dbg !15
+  ret i32 %a, !dbg !16
+}
+
+; CHECK:             .section        .BTF,"",@progbits
+; CHECK-NEXT:        .short  60319                   # 0xeb9f
+; CHECK-NEXT:        .byte   1
+; CHECK-NEXT:        .byte   0
+; CHECK-NEXT:        .long   24
+; CHECK-NEXT:        .long   0
+; CHECK-NEXT:        .long   72
+; CHECK-NEXT:        .long   72
+; CHECK-NEXT:        .long   35
+; CHECK-NEXT:        .long   16                      # BTF_KIND_TYPEDEF(id = 1)
+; CHECK-NEXT:        .long   134217728               # 0x8000000
+; CHECK-NEXT:        .long   2
+; CHECK-NEXT:        .long   22                      # BTF_KIND_TYPEDEF(id = 2)
+; CHECK-NEXT:        .long   134217728               # 0x8000000
+; CHECK-NEXT:        .long   3
+; CHECK-NEXT:        .long   27                      # BTF_KIND_INT(id = 3)
+; CHECK-NEXT:        .long   16777216                # 0x1000000
+; CHECK-NEXT:        .long   4
+; CHECK-NEXT:        .long   16777248                # 0x1000020
+; CHECK-NEXT:        .long   0                       # BTF_KIND_FUNC_PROTO(id = 4)
+; CHECK-NEXT:        .long   218103809               # 0xd000001
+; CHECK-NEXT:        .long   1
+; CHECK-NEXT:        .long   31
+; CHECK-NEXT:        .long   1
+; CHECK-NEXT:        .long   33                      # BTF_KIND_FUNC(id = 5)
+; CHECK-NEXT:        .long   201326592               # 0xc000000
+; CHECK-NEXT:        .long   4
+; CHECK-NEXT:        .byte   0                       # string offset=0
+; CHECK-NEXT:        .ascii  ".text"                 # string offset=1
+; CHECK-NEXT:        .byte   0
+; CHECK-NEXT:        .ascii  "/tmp/t.c"              # string offset=7
+; CHECK-NEXT:        .byte   0
+; CHECK-NEXT:        .ascii  "__int"                 # string offset=16
+; CHECK-NEXT:        .byte   0
+; CHECK-NEXT:        .ascii  "_int"                  # string offset=22
+; CHECK-NEXT:        .byte   0
+; CHECK-NEXT:        .ascii  "int"                   # string offset=27
+; CHECK-NEXT:        .byte   0
+; CHECK-NEXT:        .byte   97                      # string offset=31
+; CHECK-NEXT:        .byte   0
+; CHECK-NEXT:        .byte   102                     # string offset=33
+; CHECK-NEXT:        .byte   0
+; CHECK-NEXT:        .section        .BTF.ext,"",@progbits
+; CHECK-NEXT:        .short  60319                   # 0xeb9f
+; CHECK-NEXT:        .byte   1
+; CHECK-NEXT:        .byte   0
+; CHECK-NEXT:        .long   24
+; CHECK-NEXT:        .long   0
+; CHECK-NEXT:        .long   20
+; CHECK-NEXT:        .long   20
+; CHECK-NEXT:        .long   44
+; CHECK-NEXT:        .long   8                       # FuncInfo
+; CHECK-NEXT:        .long   1                       # FuncInfo section string offset=1
+; CHECK-NEXT:        .long   1
+; CHECK-NEXT:        .long   .Lfunc_begin0
+; CHECK-NEXT:        .long   5
+; CHECK-NEXT:        .long   16                      # LineInfo
+; CHECK-NEXT:        .long   1                       # LineInfo section string offset=1
+; CHECK-NEXT:        .long   2
+; CHECK-NEXT:        .long   .Lfunc_begin0
+; CHECK-NEXT:        .long   7
+; CHECK-NEXT:        .long   0
+; CHECK-NEXT:        .long   3072                    # Line 3 Col 0
+; CHECK-NEXT:        .long   .Ltmp{{[0-9]+}}
+; CHECK-NEXT:        .long   7
+; CHECK-NEXT:        .long   0
+; CHECK-NEXT:        .long   3092                    # Line 3 Col 20
+
+; Function Attrs: nounwind readnone speculatable
+declare void @llvm.dbg.value(metadata, metadata, metadata) #1
+
+attributes #0 = { nounwind readnone "correctly-rounded-divide-sqrt-fp-math"="false" "disable-tail-calls"="false" "less-precise-fpmad"="false" "no-frame-pointer-elim"="true" "no-frame-pointer-elim-non-leaf" "no-infs-fp-math"="false" "no-jump-tables"="false" "no-nans-fp-math"="false" "no-signed-zeros-fp-math"="false" "no-trapping-math"="false" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" }
+attributes #1 = { nounwind readnone speculatable }
+
+!llvm.dbg.cu = !{!0}
+!llvm.module.flags = !{!3, !4, !5}
+!llvm.ident = !{!6}
+
+!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 8.0.0 (trunk 344789) (llvm/trunk 344782)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, nameTableKind: None)
+!1 = !DIFile(filename: "t.c", directory: "/tmp")
+!2 = !{}
+!3 = !{i32 2, !"Dwarf Version", i32 4}
+!4 = !{i32 2, !"Debug Info Version", i32 3}
+!5 = !{i32 1, !"wchar_size", i32 4}
+!6 = !{!"clang version 8.0.0 (trunk 344789) (llvm/trunk 344782)"}
+!7 = distinct !DISubprogram(name: "f", scope: !1, file: !1, line: 3, type: !8, isLocal: false, isDefinition: true, scopeLine: 3, flags: DIFlagPrototyped, isOptimized: true, unit: !0, retainedNodes: !13)
+!8 = !DISubroutineType(types: !9)
+!9 = !{!10, !10}
+!10 = !DIDerivedType(tag: DW_TAG_typedef, name: "__int", file: !1, line: 2, baseType: !11)
+!11 = !DIDerivedType(tag: DW_TAG_typedef, name: "_int", file: !1, line: 1, baseType: !12)
+!12 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
+!13 = !{!14}
+!14 = !DILocalVariable(name: "a", arg: 1, scope: !7, file: !1, line: 3, type: !10)
+!15 = !DILocation(line: 3, column: 15, scope: !7)
+!16 = !DILocation(line: 3, column: 20, scope: !7)

test/CodeGen/BPF/BTF/func-unused-arg.ll

+; RUN: llc -march=bpfel -filetype=asm -o - %s | FileCheck -check-prefixes=CHECK %s
+; RUN: llc -march=bpfeb -filetype=asm -o - %s | FileCheck -check-prefixes=CHECK %s
+
+; Source code:
+;   int f1(int a1) { return 0; }
+; Compilation flag:
+;   clang -target bpf -O2 -g -S -emit-llvm t.c
+
+; Function Attrs: nounwind readnone
+define dso_local i32 @f1(i32) local_unnamed_addr #0 !dbg !7 {
+  call void @llvm.dbg.value(metadata i32 %0, metadata !12, metadata !DIExpression()), !dbg !13
+  ret i32 0, !dbg !14
+}
+
+; CHECK:             .section        .BTF,"",@progbits
+; CHECK-NEXT:        .short  60319                   # 0xeb9f
+; CHECK-NEXT:        .byte   1
+; CHECK-NEXT:        .byte   0
+; CHECK-NEXT:        .long   24
+; CHECK-NEXT:        .long   0
+; CHECK-NEXT:        .long   48
+; CHECK-NEXT:        .long   48
+; CHECK-NEXT:        .long   26
+; CHECK-NEXT:        .long   16                      # BTF_KIND_INT(id = 1)
+; CHECK-NEXT:        .long   16777216                # 0x1000000
+; CHECK-NEXT:        .long   4
+; CHECK-NEXT:        .long   16777248                # 0x1000020
+; CHECK-NEXT:        .long   0                       # BTF_KIND_FUNC_PROTO(id = 2)
+; CHECK-NEXT:        .long   218103809               # 0xd000001
+; CHECK-NEXT:        .long   1
+; CHECK-NEXT:        .long   20
+; CHECK-NEXT:        .long   1
+; CHECK-NEXT:        .long   23                      # BTF_KIND_FUNC(id = 3)
+; CHECK-NEXT:        .long   201326592               # 0xc000000
+; CHECK-NEXT:        .long   2
+; CHECK-NEXT:        .byte   0                       # string offset=0
+; CHECK-NEXT:        .ascii  ".text"                 # string offset=1
+; CHECK-NEXT:        .byte   0
+; CHECK-NEXT:        .ascii  "/tmp/t.c"              # string offset=7
+; CHECK-NEXT:        .byte   0
+; CHECK-NEXT:        .ascii  "int"                   # string offset=16
+; CHECK-NEXT:        .byte   0
+; CHECK-NEXT:        .ascii  "a1"                    # string offset=20
+; CHECK-NEXT:        .byte   0
+; CHECK-NEXT:        .ascii  "f1"                    # string offset=23
+; CHECK-NEXT:        .byte   0
+; CHECK-NEXT:        .section        .BTF.ext,"",@progbits
+; CHECK-NEXT:        .short  60319                   # 0xeb9f
+; CHECK-NEXT:        .byte   1
+; CHECK-NEXT:        .byte   0
+; CHECK-NEXT:        .long   24
+; CHECK-NEXT:        .long   0
+; CHECK-NEXT:        .long   20
+; CHECK-NEXT:        .long   20
+; CHECK-NEXT:        .long   28
+; CHECK-NEXT:        .long   8                       # FuncInfo
+; CHECK-NEXT:        .long   1                       # FuncInfo section string offset=1
+; CHECK-NEXT:        .long   1
+; CHECK-NEXT:        .long   .Lfunc_begin0
+; CHECK-NEXT:        .long   3
+; CHECK-NEXT:        .long   16                      # LineInfo
+; CHECK-NEXT:        .long   1                       # LineInfo section string offset=1
+; CHECK-NEXT:        .long   1
+; CHECK-NEXT:        .long   .Ltmp{{[0-9]+}}
+; CHECK-NEXT:        .long   7
+; CHECK-NEXT:        .long   0
+; CHECK-NEXT:        .long   1042                    # Line 1 Col 18
+
+; Function Attrs: nounwind readnone speculatable
+declare void @llvm.dbg.value(metadata, metadata, metadata) #1
+
+attributes #0 = { nounwind readnone "correctly-rounded-divide-sqrt-fp-math"="false" "disable-tail-calls"="false" "less-precise-fpmad"="false" "min-legal-vector-width"="0" "no-frame-pointer-elim"="true" "no-frame-pointer-elim-non-leaf" "no-infs-fp-math"="false" "no-jump-tables"="false" "no-nans-fp-math"="false" "no-signed-zeros-fp-math"="false" "no-trapping-math"="false" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" }
+attributes #1 = { nounwind readnone speculatable }
+
+!llvm.dbg.cu = !{!0}
+!llvm.module.flags = !{!3, !4, !5}
+!llvm.ident = !{!6}
+
+!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 8.0.0 (trunk 345562) (llvm/trunk 345560)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, nameTableKind: None)
+!1 = !DIFile(filename: "t.c", directory: "/tmp")
+!2 = !{}
+!3 = !{i32 2, !"Dwarf Version", i32 4}
+!4 = !{i32 2, !"Debug Info Version", i32 3}
+!5 = !{i32 1, !"wchar_size", i32 4}
+!6 = !{!"clang version 8.0.0 (trunk 345562) (llvm/trunk 345560)"}
+!7 = distinct !DISubprogram(name: "f1", scope: !1, file: !1, line: 1, type: !8, isLocal: false, isDefinition: true, scopeLine: 1, flags: DIFlagPrototyped, isOptimized: true, unit: !0, retainedNodes: !11)
+!8 = !DISubroutineType(types: !9)
+!9 = !{!10, !10}
+!10 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
+!11 = !{!12}
+!12 = !DILocalVariable(name: "a1", arg: 1, scope: !7, file: !1, line: 1, type: !10)
+!13 = !DILocation(line: 1, column: 12, scope: !7)
+!14 = !DILocation(line: 1, column: 18, scope: !7)

test/CodeGen/BPF/BTF/func-void.ll

+; RUN: llc -march=bpfel -filetype=asm -o - %s | FileCheck -check-prefixes=CHECK %s
+; RUN: llc -march=bpfeb -filetype=asm -o - %s | FileCheck -check-prefixes=CHECK %s
+
+; Source code:
+;   void f1(void) {}
+; Compilation flag:
+;   clang -target bpf -O2 -g -S -emit-llvm t.c
+
+; Function Attrs: norecurse nounwind readnone
+define dso_local void @f1() local_unnamed_addr #0 !dbg !7 {
+  ret void, !dbg !10
+}
+
+; CHECK:             .section        .BTF,"",@progbits
+; CHECK-NEXT:        .short  60319                   # 0xeb9f
+; CHECK-NEXT:        .byte   1
+; CHECK-NEXT:        .byte   0
+; CHECK-NEXT:        .long   24
+; CHECK-NEXT:        .long   0
+; CHECK-NEXT:        .long   24
+; CHECK-NEXT:        .long   24
+; CHECK-NEXT:        .long   19
+; CHECK-NEXT:        .long   0                       # BTF_KIND_FUNC_PROTO(id = 1)
+; CHECK-NEXT:        .long   218103808               # 0xd000000
+; CHECK-NEXT:        .long   0
+; CHECK-NEXT:        .long   16                      # BTF_KIND_FUNC(id = 2)
+; CHECK-NEXT:        .long   201326592               # 0xc000000
+; CHECK-NEXT:        .long   1
+; CHECK-NEXT:        .byte   0                       # string offset=0
+; CHECK-NEXT:        .ascii  ".text"                 # string offset=1
+; CHECK-NEXT:        .byte   0
+; CHECK-NEXT:        .ascii  "/tmp/t.c"              # string offset=7
+; CHECK-NEXT:        .byte   0
+; CHECK-NEXT:        .ascii  "f1"                    # string offset=16
+; CHECK-NEXT:        .byte   0
+; CHECK-NEXT:        .section        .BTF.ext,"",@progbits
+; CHECK-NEXT:        .short  60319                   # 0xeb9f
+; CHECK-NEXT:        .byte   1
+; CHECK-NEXT:        .byte   0
+; CHECK-NEXT:        .long   24
+; CHECK-NEXT:        .long   0
+; CHECK-NEXT:        .long   20
+; CHECK-NEXT:        .long   20
+; CHECK-NEXT:        .long   28
+; CHECK-NEXT:        .long   8                       # FuncInfo
+; CHECK-NEXT:        .long   1                       # FuncInfo section string offset=1
+; CHECK-NEXT:        .long   1
+; CHECK-NEXT:        .long   .Lfunc_begin0
+; CHECK-NEXT:        .long   2
+; CHECK-NEXT:        .long   16                      # LineInfo
+; CHECK-NEXT:        .long   1                       # LineInfo section string offset=1
+; CHECK-NEXT:        .long   1
+; CHECK-NEXT:        .long   .Ltmp{{[0-9]+}}
+; CHECK-NEXT:        .long   7
+; CHECK-NEXT:        .long   0
+; CHECK-NEXT:        .long   1040                    # Line 1 Col 16
+
+attributes #0 = { norecurse nounwind readnone "correctly-rounded-divide-sqrt-fp-math"="false" "disable-tail-calls"="false" "less-precise-fpmad"="false" "min-legal-vector-width"="0" "no-frame-pointer-elim"="true" "no-frame-pointer-elim-non-leaf" "no-infs-fp-math"="false" "no-jump-tables"="false" "no-nans-fp-math"="false" "no-signed-zeros-fp-math"="false" "no-trapping-math"="false" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" }
+
+!llvm.dbg.cu = !{!0}
+!llvm.module.flags = !{!3, !4, !5}
+!llvm.ident = !{!6}
+
+!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 8.0.0 (trunk 345562) (llvm/trunk 345560)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, nameTableKind: None)
+!1 = !DIFile(filename: "t.c", directory: "/tmp")
+!2 = !{}
+!3 = !{i32 2, !"Dwarf Version", i32 4}
+!4 = !{i32 2, !"Debug Info Version", i32 3}
+!5 = !{i32 1, !"wchar_size", i32 4}
+!6 = !{!"clang version 8.0.0 (trunk 345562) (llvm/trunk 345560)"}
+!7 = distinct !DISubprogram(name: "f1", scope: !1, file: !1, line: 1, type: !8, isLocal: false, isDefinition: true, scopeLine: 1, flags: DIFlagPrototyped, isOptimized: true, unit: !0, retainedNodes: !2)
+!8 = !DISubroutineType(types: !9)
+!9 = !{null}
+!10 = !DILocation(line: 1, column: 16, scope: !7)

test/CodeGen/BPF/BTF/fwd-no-define.ll

+; RUN: llc -march=bpfel -filetype=asm -o - %s | FileCheck -check-prefixes=CHECK %s
+; RUN: llc -march=bpfeb -filetype=asm -o - %s | FileCheck -check-prefixes=CHECK %s
+
+; Source code:
+;   struct t1;
+;   struct t2 {struct t1 *p;} a;
+; Compilation flag:
+;   clang -target bpf -O2 -g -S -emit-llvm t.c
+
+%struct.t2 = type { %struct.t1* }
+%struct.t1 = type opaque
+
+@a = common dso_local local_unnamed_addr global %struct.t2 zeroinitializer, align 8, !dbg !0
+
+!llvm.dbg.cu = !{!2}
+!llvm.module.flags = !{!11, !12, !13}
+!llvm.ident = !{!14}
+
+; CHECK:             .section        .BTF,"",@progbits
+; CHECK-NEXT:        .short  60319                   # 0xeb9f
+; CHECK-NEXT:        .byte   1
+; CHECK-NEXT:        .byte   0
+; CHECK-NEXT:        .long   24
+; CHECK-NEXT:        .long   0
+; CHECK-NEXT:        .long   48
+; CHECK-NEXT:        .long   48
+; CHECK-NEXT:        .long   9
+; CHECK-NEXT:        .long   1                       # BTF_KIND_STRUCT(id = 1)
+; CHECK-NEXT:        .long   67108865                # 0x4000001
+; CHECK-NEXT:        .long   8
+; CHECK-NEXT:        .long   4
+; CHECK-NEXT:        .long   2
+; CHECK-NEXT:        .long   0
+; CHECK-NEXT:        .long   0                       # BTF_KIND_PTR(id = 2)
+; CHECK-NEXT:        .long   33554432                # 0x2000000
+; CHECK-NEXT:        .long   3
+; CHECK-NEXT:        .long   6                       # BTF_KIND_FWD(id = 3)
+; CHECK-NEXT:        .long   117440512               # 0x7000000
+; CHECK-NEXT:        .long   0
+; CHECK-NEXT:        .byte   0                       # string offset=0
+; CHECK-NEXT:        .ascii  "t2"                    # string offset=1
+; CHECK-NEXT:        .byte   0
+; CHECK-NEXT:        .byte   112                     # string offset=4
+; CHECK-NEXT:        .byte   0
+; CHECK-NEXT:        .ascii  "t1"                    # string offset=6
+; CHECK-NEXT:        .byte   0
+; CHECK-NEXT:        .section        .BTF.ext,"",@progbits
+; CHECK-NEXT:        .short  60319                   # 0xeb9f
+; CHECK-NEXT:        .byte   1
+; CHECK-NEXT:        .byte   0
+; CHECK-NEXT:        .long   24
+; CHECK-NEXT:        .long   0
+; CHECK-NEXT:        .long   4
+; CHECK-NEXT:        .long   4
+; CHECK-NEXT:        .long   4
+; CHECK-NEXT:        .long   8                       # FuncInfo
+; CHECK-NEXT:        .long   16                      # LineInfo
+
+!0 = !DIGlobalVariableExpression(var: !1, expr: !DIExpression())
+!1 = distinct !DIGlobalVariable(name: "a", scope: !2, file: !3, line: 2, type: !6, isLocal: false, isDefinition: true)
+!2 = distinct !DICompileUnit(language: DW_LANG_C99, file: !3, producer: "clang version 8.0.0 (trunk 344789) (llvm/trunk 344782)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !4, globals: !5, nameTableKind: None)
+!3 = !DIFile(filename: "t.c", directory: "/home/yhs/tmp")
+!4 = !{}
+!5 = !{!0}
+!6 = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "t2", file: !3, line: 2, size: 64, elements: !7)
+!7 = !{!8}
+!8 = !DIDerivedType(tag: DW_TAG_member, name: "p", scope: !6, file: !3, line: 2, baseType: !9, size: 64)
+!9 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !10, size: 64)
+!10 = !DICompositeType(tag: DW_TAG_structure_type, name: "t1", file: !3, line: 1, flags: DIFlagFwdDecl)
+!11 = !{i32 2, !"Dwarf Version", i32 4}
+!12 = !{i32 2, !"Debug Info Version", i32 3}
+!13 = !{i32 1, !"wchar_size", i32 4}
+!14 = !{!"clang version 8.0.0 (trunk 344789) (llvm/trunk 344782)"}

test/CodeGen/BPF/BTF/fwd-with-define.ll

+; RUN: llc -march=bpfel -filetype=asm -o - %s | FileCheck -check-prefixes=CHECK %s
+; RUN: llc -march=bpfeb -filetype=asm -o - %s | FileCheck -check-prefixes=CHECK %s
+
+; Source code:
+;   struct t1;
+;   struct t1 {struct t1 *p;} a;
+; Compilation flag:
+;   clang -target bpf -O2 -g -S -emit-llvm t.c
+
+%struct.t1 = type { %struct.t1* }
+
+@a = common dso_local local_unnamed_addr global %struct.t1 zeroinitializer, align 8, !dbg !0
+
+!llvm.dbg.cu = !{!2}
+!llvm.module.flags = !{!10, !11, !12}
+!llvm.ident = !{!13}
+
+; CHECK:             .section        .BTF,"",@progbits
+; CHECK-NEXT:        .short  60319                   # 0xeb9f
+; CHECK-NEXT:        .byte   1
+; CHECK-NEXT:        .byte   0
+; CHECK-NEXT:        .long   24
+; CHECK-NEXT:        .long   0
+; CHECK-NEXT:        .long   36
+; CHECK-NEXT:        .long   36
+; CHECK-NEXT:        .long   6
+; CHECK-NEXT:        .long   1                       # BTF_KIND_STRUCT(id = 1)
+; CHECK-NEXT:        .long   67108865                # 0x4000001
+; CHECK-NEXT:        .long   8
+; CHECK-NEXT:        .long   4
+; CHECK-NEXT:        .long   2
+; CHECK-NEXT:        .long   0
+; CHECK-NEXT:        .long   0                       # BTF_KIND_PTR(id = 2)
+; CHECK-NEXT:        .long   33554432                # 0x2000000
+; CHECK-NEXT:        .long   1
+; CHECK-NEXT:        .byte   0                       # string offset=0
+; CHECK-NEXT:        .ascii  "t1"                    # string offset=1
+; CHECK-NEXT:        .byte   0
+; CHECK-NEXT:        .byte   112                     # string offset=4
+; CHECK-NEXT:        .byte   0
+; CHECK-NEXT:        .section        .BTF.ext,"",@progbits
+; CHECK-NEXT:        .short  60319                   # 0xeb9f
+; CHECK-NEXT:        .byte   1
+; CHECK-NEXT:        .byte   0
+; CHECK-NEXT:        .long   24
+; CHECK-NEXT:        .long   0
+; CHECK-NEXT:        .long   4
+; CHECK-NEXT:        .long   4
+; CHECK-NEXT:        .long   4
+; CHECK-NEXT:        .long   8                       # FuncInfo
+; CHECK-NEXT:        .long   16                      # LineInfo
+
+!0 = !DIGlobalVariableExpression(var: !1, expr: !DIExpression())
+!1 = distinct !DIGlobalVariable(name: "a", scope: !2, file: !3, line: 2, type: !6, isLocal: false, isDefinition: true)
+!2 = distinct !DICompileUnit(language: DW_LANG_C99, file: !3, producer: "clang version 8.0.0 (trunk 344789) (llvm/trunk 344782)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !4, globals: !5, nameTableKind: None)
+!3 = !DIFile(filename: "t.c", directory: "/home/yhs/tmp")
+!4 = !{}
+!5 = !{!0}
+!6 = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "t1", file: !3, line: 2, size: 64, elements: !7)
+!7 = !{!8}
+!8 = !DIDerivedType(tag: DW_TAG_member, name: "p", scope: !6, file: !3, line: 2, baseType: !9, size: 64)
+!9 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !6, size: 64)
+!10 = !{i32 2, !"Dwarf Version", i32 4}
+!11 = !{i32 2, !"Debug Info Version", i32 3}
+!12 = !{i32 1, !"wchar_size", i32 4}
+!13 = !{!"clang version 8.0.0 (trunk 344789) (llvm/trunk 344782)"}

test/CodeGen/BPF/BTF/int.ll

+; RUN: llc -march=bpfel -filetype=asm -o - %s | FileCheck -check-prefixes=CHECK %s
+; RUN: llc -march=bpfeb -filetype=asm -o - %s | FileCheck -check-prefixes=CHECK %s
+
+; Source code:
+;   int a;
+; Compilation flag:
+;   clang -target bpf -O2 -g -S -emit-llvm t.c
+
+@a = common dso_local local_unnamed_addr global i32 0, align 4, !dbg !0
+
+!llvm.dbg.cu = !{!2}
+!llvm.module.flags = !{!7, !8, !9}
+!llvm.ident = !{!10}
+
+; CHECK:             .section        .BTF,"",@progbits
+; CHECK-NEXT:        .short  60319                   # 0xeb9f
+; CHECK-NEXT:        .byte   1
+; CHECK-NEXT:        .byte   0
+; CHECK-NEXT:        .long   24
+; CHECK-NEXT:        .long   0
+; CHECK-NEXT:        .long   16
+; CHECK-NEXT:        .long   16
+; CHECK-NEXT:        .long   5
+; CHECK-NEXT:        .long   1                       # BTF_KIND_INT(id = 1)
+; CHECK-NEXT:        .long   16777216                # 0x1000000
+; CHECK-NEXT:        .long   4
+; CHECK-NEXT:        .long   16777248                # 0x1000020
+; CHECK-NEXT:        .byte   0                       # string offset=0
+; CHECK-NEXT:        .ascii  "int"                   # string offset=1
+; CHECK-NEXT:        .byte   0
+; CHECK-NEXT:        .section        .BTF.ext,"",@progbits
+; CHECK-NEXT:        .short  60319                   # 0xeb9f
+; CHECK-NEXT:        .byte   1
+; CHECK-NEXT:        .byte   0
+; CHECK-NEXT:        .long   24
+; CHECK-NEXT:        .long   0
+; CHECK-NEXT:        .long   4
+; CHECK-NEXT:        .long   4
+; CHECK-NEXT:        .long   4
+; CHECK-NEXT:        .long   8                       # FuncInfo
+; CHECK-NEXT:        .long   16                      # LineInfo
+
+!0 = !DIGlobalVariableExpression(var: !1, expr: !DIExpression())
+!1 = distinct !DIGlobalVariable(name: "a", scope: !2, file: !3, line: 1, type: !6, isLocal: false, isDefinition: true)
+!2 = distinct !DICompileUnit(language: DW_LANG_C99, file: !3, producer: "clang version 8.0.0 (trunk 344789) (llvm/trunk 344782)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !4, globals: !5, nameTableKind: None)
+!3 = !DIFile(filename: "t.c", directory: "/home/yhs/tmp")
+!4 = !{}
+!5 = !{!0}
+!6 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
+!7 = !{i32 2, !"Dwarf Version", i32 4}
+!8 = !{i32 2, !"Debug Info Version", i32 3}
+!9 = !{i32 1, !"wchar_size", i32 4}
+!10 = !{!"clang version 8.0.0 (trunk 344789) (llvm/trunk 344782)"}

test/CodeGen/BPF/BTF/longlong.ll

+; RUN: llc -march=bpfel -filetype=asm -o - %s | FileCheck -check-prefixes=CHECK %s
+; RUN: llc -march=bpfeb -filetype=asm -o - %s | FileCheck -check-prefixes=CHECK %s
+
+; Source code:
+;   long long a;
+; Compilation flag:
+;   clang -target bpf -O2 -g -S -emit-llvm t.c
+
+@a = common dso_local local_unnamed_addr global i64 0, align 8, !dbg !0
+
+!llvm.dbg.cu = !{!2}
+!llvm.module.flags = !{!7, !8, !9}
+!llvm.ident = !{!10}
+
+; CHECK:             .section        .BTF,"",@progbits
+; CHECK-NEXT:        .short  60319                   # 0xeb9f
+; CHECK-NEXT:        .byte   1
+; CHECK-NEXT:        .byte   0
+; CHECK-NEXT:        .long   24
+; CHECK-NEXT:        .long   0
+; CHECK-NEXT:        .long   16
+; CHECK-NEXT:        .long   16
+; CHECK-NEXT:        .long   15
+; CHECK-NEXT:        .long   1                       # BTF_KIND_INT(id = 1)
+; CHECK-NEXT:        .long   16777216                # 0x1000000
+; CHECK-NEXT:        .long   8
+; CHECK-NEXT:        .long   16777280                # 0x1000040
+; CHECK-NEXT:        .byte   0                       # string offset=0
+; CHECK-NEXT:        .ascii  "long long int"         # string offset=1
+; CHECK-NEXT:        .byte   0
+; CHECK-NEXT:        .section        .BTF.ext,"",@progbits
+; CHECK-NEXT:        .short  60319                   # 0xeb9f
+; CHECK-NEXT:        .byte   1
+; CHECK-NEXT:        .byte   0
+; CHECK-NEXT:        .long   24
+; CHECK-NEXT:        .long   0
+; CHECK-NEXT:        .long   4
+; CHECK-NEXT:        .long   4
+; CHECK-NEXT:        .long   4
+; CHECK-NEXT:        .long   8                       # FuncInfo
+; CHECK-NEXT:        .long   16                      # LineInfo
+
+!0 = !DIGlobalVariableExpression(var: !1, expr: !DIExpression())
+!1 = distinct !DIGlobalVariable(name: "a", scope: !2, file: !3, line: 1, type: !6, isLocal: false, isDefinition: true)
+!2 = distinct !DICompileUnit(language: DW_LANG_C99, file: !3, producer: "clang version 8.0.0 (trunk 344789) (llvm/trunk 344782)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !4, globals: !5, nameTableKind: None)
+!3 = !DIFile(filename: "t.c", directory: "/home/yhs/tmp")
+!4 = !{}
+!5 = !{!0}
+!6 = !DIBasicType(name: "long long int", size: 64, encoding: DW_ATE_signed)
+!7 = !{i32 2, !"Dwarf Version", i32 4}
+!8 = !{i32 2, !"Debug Info Version", i32 3}
+!9 = !{i32 1, !"wchar_size", i32 4}
+!10 = !{!"clang version 8.0.0 (trunk 344789) (llvm/trunk 344782)"}

test/CodeGen/BPF/BTF/ptr-const-void.ll

+; RUN: llc -march=bpfel -filetype=asm -o - %s | FileCheck -check-prefixes=CHECK %s
+; RUN: llc -march=bpfeb -filetype=asm -o - %s | FileCheck -check-prefixes=CHECK %s
+
+; Source code:
+;   const void *a;
+; Compilation flag:
+;   clang -target bpf -O2 -g -S -emit-llvm t.c
+
+@p = common dso_local local_unnamed_addr global i8* null, align 8, !dbg !0
+
+!llvm.dbg.cu = !{!2}
+!llvm.module.flags = !{!8, !9, !10}
+!llvm.ident = !{!11}
+
+; CHECK:             .section        .BTF,"",@progbits
+; CHECK-NEXT:        .short  60319                   # 0xeb9f
+; CHECK-NEXT:        .byte   1
+; CHECK-NEXT:        .byte   0
+; CHECK-NEXT:        .long   24
+; CHECK-NEXT:        .long   0
+; CHECK-NEXT:        .long   24
+; CHECK-NEXT:        .long   24
+; CHECK-NEXT:        .long   1
+; CHECK-NEXT:        .long   0                       # BTF_KIND_PTR(id = 1)
+; CHECK-NEXT:        .long   33554432                # 0x2000000
+; CHECK-NEXT:        .long   2
+; CHECK-NEXT:        .long   0                       # BTF_KIND_CONST(id = 2)
+; CHECK-NEXT:        .long   167772160               # 0xa000000
+; CHECK-NEXT:        .long   0
+; CHECK-NEXT:        .byte   0                       # string offset=0
+; CHECK-NEXT:        .section        .BTF.ext,"",@progbits
+; CHECK-NEXT:        .short  60319                   # 0xeb9f
+; CHECK-NEXT:        .byte   1
+; CHECK-NEXT:        .byte   0
+; CHECK-NEXT:        .long   24
+; CHECK-NEXT:        .long   0
+; CHECK-NEXT:        .long   4
+; CHECK-NEXT:        .long   4
+; CHECK-NEXT:        .long   4
+; CHECK-NEXT:        .long   8                       # FuncInfo
+; CHECK-NEXT:        .long   16                      # LineInfo
+
+!0 = !DIGlobalVariableExpression(var: !1, expr: !DIExpression())
+!1 = distinct !DIGlobalVariable(name: "p", scope: !2, file: !3, line: 1, type: !6, isLocal: false, isDefinition: true)
+!2 = distinct !DICompileUnit(language: DW_LANG_C99, file: !3, producer: "clang version 8.0.0 (trunk 344789) (llvm/trunk 344782)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !4, globals: !5, nameTableKind: None)
+!3 = !DIFile(filename: "t.c", directory: "/home/yhs/tmp")
+!4 = !{}
+!5 = !{!0}
+!6 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !7, size: 64)
+!7 = !DIDerivedType(tag: DW_TAG_const_type, baseType: null)
+!8 = !{i32 2, !"Dwarf Version", i32 4}
+!9 = !{i32 2, !"Debug Info Version", i32 3}
+!10 = !{i32 1, !"wchar_size", i32 4}
+!11 = !{!"clang version 8.0.0 (trunk 344789) (llvm/trunk 344782)"}

test/CodeGen/BPF/BTF/ptr-func-1.ll

+; RUN: llc -march=bpfel -filetype=asm -o - %s | FileCheck -check-prefixes=CHECK %s
+; RUN: llc -march=bpfeb -filetype=asm -o - %s | FileCheck -check-prefixes=CHECK %s
+
+; Source code:
+;   void (*a)(void);
+; Compilation flag:
+;   clang -target bpf -O2 -g -S -emit-llvm t.c
+
+@a = common dso_local local_unnamed_addr global void ()* null, align 8, !dbg !0
+
+!llvm.dbg.cu = !{!2}
+!llvm.module.flags = !{!9, !10, !11}
+!llvm.ident = !{!12}
+
+; CHECK:             .section        .BTF,"",@progbits
+; CHECK-NEXT:        .short  60319                   # 0xeb9f
+; CHECK-NEXT:        .byte   1
+; CHECK-NEXT:        .byte   0
+; CHECK-NEXT:        .long   24
+; CHECK-NEXT:        .long   0
+; CHECK-NEXT:        .long   24
+; CHECK-NEXT:        .long   24
+; CHECK-NEXT:        .long   1
+; CHECK-NEXT:        .long   0                       # BTF_KIND_PTR(id = 1)
+; CHECK-NEXT:        .long   33554432                # 0x2000000
+; CHECK-NEXT:        .long   2
+; CHECK-NEXT:        .long   0                       # BTF_KIND_FUNC_PROTO(id = 2)
+; CHECK-NEXT:        .long   218103808               # 0xd000000
+; CHECK-NEXT:        .long   0
+; CHECK-NEXT:        .byte   0                       # string offset=0
+; CHECK-NEXT:        .section        .BTF.ext,"",@progbits
+; CHECK-NEXT:        .short  60319                   # 0xeb9f
+; CHECK-NEXT:        .byte   1
+; CHECK-NEXT:        .byte   0
+; CHECK-NEXT:        .long   24
+; CHECK-NEXT:        .long   0
+; CHECK-NEXT:        .long   4
+; CHECK-NEXT:        .long   4
+; CHECK-NEXT:        .long   4
+; CHECK-NEXT:        .long   8                       # FuncInfo
+; CHECK-NEXT:        .long   16                      # LineInfo
+
+!0 = !DIGlobalVariableExpression(var: !1, expr: !DIExpression())
+!1 = distinct !DIGlobalVariable(name: "a", scope: !2, file: !3, line: 1, type: !6, isLocal: false, isDefinition: true)
+!2 = distinct !DICompileUnit(language: DW_LANG_C99, file: !3, producer: "clang version 8.0.0 (trunk 344789) (llvm/trunk 344782)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !4, globals: !5, nameTableKind: None)
+!3 = !DIFile(filename: "t.c", directory: "/home/yhs/tmp")
+!4 = !{}
+!5 = !{!0}
+!6 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !7, size: 64)
+!7 = !DISubroutineType(types: !8)
+!8 = !{null}
+!9 = !{i32 2, !"Dwarf Version", i32 4}
+!10 = !{i32 2, !"Debug Info Version", i32 3}
+!11 = !{i32 1, !"wchar_size", i32 4}
+!12 = !{!"clang version 8.0.0 (trunk 344789) (llvm/trunk 344782)"}

test/CodeGen/BPF/BTF/ptr-func-2.ll

+; RUN: llc -march=bpfel -filetype=asm -o - %s | FileCheck -check-prefixes=CHECK %s
+; RUN: llc -march=bpfeb -filetype=asm -o - %s | FileCheck -check-prefixes=CHECK %s
+
+; Source code:
+;   int (*a)(int a, char b);
+; Compilation flag:
+;   clang -target bpf -O2 -g -S -emit-llvm t.c
+
+@a = common dso_local local_unnamed_addr global i32 (i32, i8)* null, align 8, !dbg !0
+
+!llvm.dbg.cu = !{!2}
+!llvm.module.flags = !{!11, !12, !13}
+!llvm.ident = !{!14}
+
+; CHECK:             .section        .BTF,"",@progbits
+; CHECK-NEXT:        .short  60319                   # 0xeb9f
+; CHECK-NEXT:        .byte   1
+; CHECK-NEXT:        .byte   0
+; CHECK-NEXT:        .long   24
+; CHECK-NEXT:        .long   0
+; CHECK-NEXT:        .long   72
+; CHECK-NEXT:        .long   72
+; CHECK-NEXT:        .long   10
+; CHECK-NEXT:        .long   0                       # BTF_KIND_PTR(id = 1)
+; CHECK-NEXT:        .long   33554432                # 0x2000000
+; CHECK-NEXT:        .long   2
+; CHECK-NEXT:        .long   0                       # BTF_KIND_FUNC_PROTO(id = 2)
+; CHECK-NEXT:        .long   218103810               # 0xd000002
+; CHECK-NEXT:        .long   3
+; CHECK-NEXT:        .long   0
+; CHECK-NEXT:        .long   3
+; CHECK-NEXT:        .long   0
+; CHECK-NEXT:        .long   4
+; CHECK-NEXT:        .long   1                       # BTF_KIND_INT(id = 3)
+; CHECK-NEXT:        .long   16777216                # 0x1000000
+; CHECK-NEXT:        .long   4
+; CHECK-NEXT:        .long   16777248                # 0x1000020
+; CHECK-NEXT:        .long   5                       # BTF_KIND_INT(id = 4)
+; CHECK-NEXT:        .long   16777216                # 0x1000000
+; CHECK-NEXT:        .long   1
+; CHECK-NEXT:        .long   16777224                # 0x1000008
+; CHECK-NEXT:        .byte   0                       # string offset=0
+; CHECK-NEXT:        .ascii  "int"                   # string offset=1
+; CHECK-NEXT:        .byte   0
+; CHECK-NEXT:        .ascii  "char"                  # string offset=5
+; CHECK-NEXT:        .byte   0
+; CHECK-NEXT:        .section        .BTF.ext,"",@progbits
+; CHECK-NEXT:        .short  60319                   # 0xeb9f
+; CHECK-NEXT:        .byte   1
+; CHECK-NEXT:        .byte   0
+; CHECK-NEXT:        .long   24
+; CHECK-NEXT:        .long   0
+; CHECK-NEXT:        .long   4
+; CHECK-NEXT:        .long   4
+; CHECK-NEXT:        .long   4
+; CHECK-NEXT:        .long   8                       # FuncInfo
+; CHECK-NEXT:        .long   16                      # LineInfo
+
+!0 = !DIGlobalVariableExpression(var: !1, expr: !DIExpression())
+!1 = distinct !DIGlobalVariable(name: "a", scope: !2, file: !3, line: 1, type: !6, isLocal: false, isDefinition: true)
+!2 = distinct !DICompileUnit(language: DW_LANG_C99, file: !3, producer: "clang version 8.0.0 (trunk 344789) (llvm/trunk 344782)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !4, globals: !5, nameTableKind: None)
+!3 = !DIFile(filename: "t.c", directory: "/home/yhs/tmp")
+!4 = !{}
+!5 = !{!0}
+!6 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !7, size: 64)
+!7 = !DISubroutineType(types: !8)
+!8 = !{!9, !9, !10}
+!9 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
+!10 = !DIBasicType(name: "char", size: 8, encoding: DW_ATE_signed_char)
+!11 = !{i32 2, !"Dwarf Version", i32 4}
+!12 = !{i32 2, !"Debug Info Version", i32 3}
+!13 = !{i32 1, !"wchar_size", i32 4}
+!14 = !{!"clang version 8.0.0 (trunk 344789) (llvm/trunk 344782)"}

test/CodeGen/BPF/BTF/ptr-func-3.ll

+; RUN: llc -march=bpfel -filetype=asm -o - %s | FileCheck -check-prefixes=CHECK %s
+; RUN: llc -march=bpfeb -filetype=asm -o - %s | FileCheck -check-prefixes=CHECK %s
+
+; Source code:
+;   typedef int __int;
+;   __int (*a)(__int a, __int b);
+; Compilation flag:
+;   clang -target bpf -O2 -g -S -emit-llvm t.c
+
+@a = common dso_local local_unnamed_addr global i32 (i32, i32)* null, align 8, !dbg !0
+
+!llvm.dbg.cu = !{!2}
+!llvm.module.flags = !{!11, !12, !13}
+!llvm.ident = !{!14}
+
+; CHECK:             .section        .BTF,"",@progbits
+; CHECK-NEXT:        .short  60319                   # 0xeb9f
+; CHECK-NEXT:        .byte   1
+; CHECK-NEXT:        .byte   0
+; CHECK-NEXT:        .long   24
+; CHECK-NEXT:        .long   0
+; CHECK-NEXT:        .long   68
+; CHECK-NEXT:        .long   68
+; CHECK-NEXT:        .long   11
+; CHECK-NEXT:        .long   0                       # BTF_KIND_PTR(id = 1)
+; CHECK-NEXT:        .long   33554432                # 0x2000000
+; CHECK-NEXT:        .long   2
+; CHECK-NEXT:        .long   0                       # BTF_KIND_FUNC_PROTO(id = 2)
+; CHECK-NEXT:        .long   218103810               # 0xd000002
+; CHECK-NEXT:        .long   3
+; CHECK-NEXT:        .long   0
+; CHECK-NEXT:        .long   3
+; CHECK-NEXT:        .long   0
+; CHECK-NEXT:        .long   3
+; CHECK-NEXT:        .long   1                       # BTF_KIND_TYPEDEF(id = 3)
+; CHECK-NEXT:        .long   134217728               # 0x8000000
+; CHECK-NEXT:        .long   4
+; CHECK-NEXT:        .long   7                       # BTF_KIND_INT(id = 4)
+; CHECK-NEXT:        .long   16777216                # 0x1000000
+; CHECK-NEXT:        .long   4
+; CHECK-NEXT:        .long   16777248                # 0x1000020
+; CHECK-NEXT:        .byte   0                       # string offset=0
+; CHECK-NEXT:        .ascii  "__int"                 # string offset=1
+; CHECK-NEXT:        .byte   0
+; CHECK-NEXT:        .ascii  "int"                   # string offset=7
+; CHECK-NEXT:        .byte   0
+; CHECK-NEXT:        .section        .BTF.ext,"",@progbits
+; CHECK-NEXT:        .short  60319                   # 0xeb9f
+; CHECK-NEXT:        .byte   1
+; CHECK-NEXT:        .byte   0
+; CHECK-NEXT:        .long   24
+; CHECK-NEXT:        .long   0
+; CHECK-NEXT:        .long   4
+; CHECK-NEXT:        .long   4
+; CHECK-NEXT:        .long   4
+; CHECK-NEXT:        .long   8                       # FuncInfo
+; CHECK-NEXT:        .long   16                      # LineInfo
+
+!0 = !DIGlobalVariableExpression(var: !1, expr: !DIExpression())
+!1 = distinct !DIGlobalVariable(name: "a", scope: !2, file: !3, line: 2, type: !6, isLocal: false, isDefinition: true)
+!2 = distinct !DICompileUnit(language: DW_LANG_C99, file: !3, producer: "clang version 8.0.0 (trunk 344789) (llvm/trunk 344782)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !4, globals: !5, nameTableKind: None)
+!3 = !DIFile(filename: "t.c", directory: "/home/yhs/tmp")
+!4 = !{}
+!5 = !{!0}
+!6 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !7, size: 64)
+!7 = !DISubroutineType(types: !8)
+!8 = !{!9, !9, !9}
+!9 = !DIDerivedType(tag: DW_TAG_typedef, name: "__int", file: !3, line: 1, baseType: !10)
+!10 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
+!11 = !{i32 2, !"Dwarf Version", i32 4}
+!12 = !{i32 2, !"Debug Info Version", i32 3}
+!13 = !{i32 1, !"wchar_size", i32 4}
+!14 = !{!"clang version 8.0.0 (trunk 344789) (llvm/trunk 344782)"}

test/CodeGen/BPF/BTF/ptr-int.ll

+; RUN: llc -march=bpfel -filetype=asm -o - %s | FileCheck -check-prefixes=CHECK %s
+; RUN: llc -march=bpfeb -filetype=asm -o - %s | FileCheck -check-prefixes=CHECK %s
+
+; Source code:
+;   int *a;
+; Compilation flag:
+;   clang -target bpf -O2 -g -S -emit-llvm t.c
+
+@a = common dso_local local_unnamed_addr global i32* null, align 8, !dbg !0
+
+!llvm.dbg.cu = !{!2}
+!llvm.module.flags = !{!8, !9, !10}
+!llvm.ident = !{!11}
+
+; CHECK:             .section        .BTF,"",@progbits
+; CHECK-NEXT:        .short  60319                   # 0xeb9f
+; CHECK-NEXT:        .byte   1
+; CHECK-NEXT:        .byte   0
+; CHECK-NEXT:        .long   24
+; CHECK-NEXT:        .long   0
+; CHECK-NEXT:        .long   28
+; CHECK-NEXT:        .long   28
+; CHECK-NEXT:        .long   5
+; CHECK-NEXT:        .long   0                       # BTF_KIND_PTR(id = 1)
+; CHECK-NEXT:        .long   33554432                # 0x2000000
+; CHECK-NEXT:        .long   2
+; CHECK-NEXT:        .long   1                       # BTF_KIND_INT(id = 2)
+; CHECK-NEXT:        .long   16777216                # 0x1000000
+; CHECK-NEXT:        .long   4
+; CHECK-NEXT:        .long   16777248                # 0x1000020
+; CHECK-NEXT:        .byte   0                       # string offset=0
+; CHECK-NEXT:        .ascii  "int"                   # string offset=1
+; CHECK-NEXT:        .byte   0
+; CHECK-NEXT:        .section        .BTF.ext,"",@progbits
+; CHECK-NEXT:        .short  60319                   # 0xeb9f
+; CHECK-NEXT:        .byte   1
+; CHECK-NEXT:        .byte   0
+; CHECK-NEXT:        .long   24
+; CHECK-NEXT:        .long   0
+; CHECK-NEXT:        .long   4
+; CHECK-NEXT:        .long   4
+; CHECK-NEXT:        .long   4
+; CHECK-NEXT:        .long   8                       # FuncInfo
+; CHECK-NEXT:        .long   16                      # LineInfo
+
+
+!0 = !DIGlobalVariableExpression(var: !1, expr: !DIExpression())
+!1 = distinct !DIGlobalVariable(name: "a", scope: !2, file: !3, line: 1, type: !6, isLocal: false, isDefinition: true)
+!2 = distinct !DICompileUnit(language: DW_LANG_C99, file: !3, producer: "clang version 8.0.0 (trunk 344789) (llvm/trunk 344782)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !4, globals: !5, nameTableKind: None)
+!3 = !DIFile(filename: "t.c", directory: "/home/yhs/tmp")
+!4 = !{}
+!5 = !{!0}
+!6 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !7, size: 64)
+!7 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
+!8 = !{i32 2, !"Dwarf Version", i32 4}
+!9 = !{i32 2, !"Debug Info Version", i32 3}
+!10 = !{i32 1, !"wchar_size", i32 4}
+!11 = !{!"clang version 8.0.0 (trunk 344789) (llvm/trunk 344782)"}

test/CodeGen/BPF/BTF/ptr-void.ll

+; RUN: llc -march=bpfel -filetype=asm -o - %s | FileCheck -check-prefixes=CHECK %s
+; RUN: llc -march=bpfeb -filetype=asm -o - %s | FileCheck -check-prefixes=CHECK %s
+
+; Source code:
+;   void *a;
+; Compilation flag:
+;   clang -target bpf -O2 -g -S -emit-llvm t.c
+
+@a = common dso_local local_unnamed_addr global i8* null, align 8, !dbg !0
+
+!llvm.dbg.cu = !{!2}
+!llvm.module.flags = !{!7, !8, !9}
+!llvm.ident = !{!10}
+
+; CHECK:             .section        .BTF,"",@progbits
+; CHECK-NEXT:        .short  60319                   # 0xeb9f
+; CHECK-NEXT:        .byte   1
+; CHECK-NEXT:        .byte   0
+; CHECK-NEXT:        .long   24
+; CHECK-NEXT:        .long   0
+; CHECK-NEXT:        .long   12
+; CHECK-NEXT:        .long   12
+; CHECK-NEXT:        .long   1
+; CHECK-NEXT:        .long   0                       # BTF_KIND_PTR(id = 1)
+; CHECK-NEXT:        .long   33554432                # 0x2000000
+; CHECK-NEXT:        .long   0
+; CHECK-NEXT:        .byte   0                       # string offset=0
+; CHECK-NEXT:        .section        .BTF.ext,"",@progbits
+; CHECK-NEXT:        .short  60319                   # 0xeb9f
+; CHECK-NEXT:        .byte   1
+; CHECK-NEXT:        .byte   0
+; CHECK-NEXT:        .long   24
+; CHECK-NEXT:        .long   0
+; CHECK-NEXT:        .long   4
+; CHECK-NEXT:        .long   4
+; CHECK-NEXT:        .long   4
+; CHECK-NEXT:        .long   8                       # FuncInfo
+; CHECK-NEXT:        .long   16                      # LineInfo
+
+!0 = !DIGlobalVariableExpression(var: !1, expr: !DIExpression())
+!1 = distinct !DIGlobalVariable(name: "a", scope: !2, file: !3, line: 1, type: !6, isLocal: false, isDefinition: true)
+!2 = distinct !DICompileUnit(language: DW_LANG_C99, file: !3, producer: "clang version 8.0.0 (trunk 345296) (llvm/trunk 345297)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !4, globals: !5, nameTableKind: None)
+!3 = !DIFile(filename: "t.c", directory: "/home/yhs/tmp")
+!4 = !{}
+!5 = !{!0}
+!6 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: null, size: 64)
+!7 = !{i32 2, !"Dwarf Version", i32 4}
+!8 = !{i32 2, !"Debug Info Version", i32 3}
+!9 = !{i32 1, !"wchar_size", i32 4}
+!10 = !{!"clang version 8.0.0 (trunk 345296) (llvm/trunk 345297)"}

test/CodeGen/BPF/BTF/ptr-volatile-const-void.ll

+; RUN: llc -march=bpfel -filetype=asm -o - %s | FileCheck -check-prefixes=CHECK %s
+; RUN: llc -march=bpfeb -filetype=asm -o - %s | FileCheck -check-prefixes=CHECK %s
+
+; Source code:
+;   volatile const void *p;
+; Compilation flag:
+;   clang -target bpf -O2 -g -S -emit-llvm t.c
+
+@p = common dso_local local_unnamed_addr global i8* null, align 8, !dbg !0
+
+!llvm.dbg.cu = !{!2}
+!llvm.module.flags = !{!9, !10, !11}
+!llvm.ident = !{!12}
+
+; CHECK:             .section        .BTF,"",@progbits
+; CHECK-NEXT:        .short  60319                   # 0xeb9f
+; CHECK-NEXT:        .byte   1
+; CHECK-NEXT:        .byte   0
+; CHECK-NEXT:        .long   24
+; CHECK-NEXT:        .long   0
+; CHECK-NEXT:        .long   36
+; CHECK-NEXT:        .long   36
+; CHECK-NEXT:        .long   1
+; CHECK-NEXT:        .long   0                       # BTF_KIND_PTR(id = 1)
+; CHECK-NEXT:        .long   33554432                # 0x2000000
+; CHECK-NEXT:        .long   2
+; CHECK-NEXT:        .long   0                       # BTF_KIND_CONST(id = 2)
+; CHECK-NEXT:        .long   167772160               # 0xa000000
+; CHECK-NEXT:        .long   3
+; CHECK-NEXT:        .long   0                       # BTF_KIND_VOLATILE(id = 3)
+; CHECK-NEXT:        .long   150994944               # 0x9000000
+; CHECK-NEXT:        .long   0
+; CHECK-NEXT:        .byte   0                       # string offset=0
+; CHECK-NEXT:        .section        .BTF.ext,"",@progbits
+; CHECK-NEXT:        .short  60319                   # 0xeb9f
+; CHECK-NEXT:        .byte   1
+; CHECK-NEXT:        .byte   0
+; CHECK-NEXT:        .long   24
+; CHECK-NEXT:        .long   0
+; CHECK-NEXT:        .long   4
+; CHECK-NEXT:        .long   4
+; CHECK-NEXT:        .long   4
+; CHECK-NEXT:        .long   8                       # FuncInfo
+; CHECK-NEXT:        .long   16                      # LineInfo
+
+!0 = !DIGlobalVariableExpression(var: !1, expr: !DIExpression())
+!1 = distinct !DIGlobalVariable(name: "p", scope: !2, file: !3, line: 1, type: !6, isLocal: false, isDefinition: true)
+!2 = distinct !DICompileUnit(language: DW_LANG_C99, file: !3, producer: "clang version 8.0.0 (trunk 344789) (llvm/trunk 344782)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !4, globals: !5, nameTableKind: None)
+!3 = !DIFile(filename: "t.c", directory: "/home/yhs/tmp")
+!4 = !{}
+!5 = !{!0}
+!6 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !7, size: 64)
+!7 = !DIDerivedType(tag: DW_TAG_const_type, baseType: !8)
+!8 = !DIDerivedType(tag: DW_TAG_volatile_type, baseType: null)
+!9 = !{i32 2, !"Dwarf Version", i32 4}
+!10 = !{i32 2, !"Debug Info Version", i32 3}
+!11 = !{i32 1, !"wchar_size", i32 4}
+!12 = !{!"clang version 8.0.0 (trunk 344789) (llvm/trunk 344782)"}

test/CodeGen/BPF/BTF/ptr-volatile-void.ll

+; RUN: llc -march=bpfel -filetype=asm -o - %s | FileCheck -check-prefixes=CHECK %s
+; RUN: llc -march=bpfeb -filetype=asm -o - %s | FileCheck -check-prefixes=CHECK %s
+
+; Source code:
+;   volatile void *a;
+; Compilation flag:
+;   clang -target bpf -O2 -g -S -emit-llvm t.c
+
+@p = common dso_local local_unnamed_addr global i8* null, align 8, !dbg !0
+
+!llvm.dbg.cu = !{!2}
+!llvm.module.flags = !{!8, !9, !10}
+!llvm.ident = !{!11}
+
+; CHECK:             .section        .BTF,"",@progbits
+; CHECK-NEXT:        .short  60319                   # 0xeb9f
+; CHECK-NEXT:        .byte   1
+; CHECK-NEXT:        .byte   0
+; CHECK-NEXT:        .long   24
+; CHECK-NEXT:        .long   0
+; CHECK-NEXT:        .long   24
+; CHECK-NEXT:        .long   24
+; CHECK-NEXT:        .long   1
+; CHECK-NEXT:        .long   0                       # BTF_KIND_PTR(id = 1)
+; CHECK-NEXT:        .long   33554432                # 0x2000000
+; CHECK-NEXT:        .long   2
+; CHECK-NEXT:        .long   0                       # BTF_KIND_VOLATILE(id = 2)
+; CHECK-NEXT:        .long   150994944               # 0x9000000
+; CHECK-NEXT:        .long   0
+; CHECK-NEXT:        .byte   0                       # string offset=0
+; CHECK-NEXT:        .section        .BTF.ext,"",@progbits
+; CHECK-NEXT:        .short  60319                   # 0xeb9f
+; CHECK-NEXT:        .byte   1
+; CHECK-NEXT:        .byte   0
+; CHECK-NEXT:        .long   24
+; CHECK-NEXT:        .long   0
+; CHECK-NEXT:        .long   4
+; CHECK-NEXT:        .long   4
+; CHECK-NEXT:        .long   4
+; CHECK-NEXT:        .long   8                       # FuncInfo
+; CHECK-NEXT:        .long   16                      # LineInfo
+
+!0 = !DIGlobalVariableExpression(var: !1, expr: !DIExpression())
+!1 = distinct !DIGlobalVariable(name: "p", scope: !2, file: !3, line: 1, type: !6, isLocal: false, isDefinition: true)
+!2 = distinct !DICompileUnit(language: DW_LANG_C99, file: !3, producer: "clang version 8.0.0 (trunk 344789) (llvm/trunk 344782)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !4, globals: !5, nameTableKind: None)
+!3 = !DIFile(filename: "t.c", directory: "/home/yhs/tmp")
+!4 = !{}
+!5 = !{!0}
+!6 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !7, size: 64)
+!7 = !DIDerivedType(tag: DW_TAG_volatile_type, baseType: null)
+!8 = !{i32 2, !"Dwarf Version", i32 4}
+!9 = !{i32 2, !"Debug Info Version", i32 3}
+!10 = !{i32 1, !"wchar_size", i32 4}
+!11 = !{!"clang version 8.0.0 (trunk 344789) (llvm/trunk 344782)"}

test/CodeGen/BPF/BTF/restrict-ptr.ll

+; RUN: llc -march=bpfel -filetype=asm -o - %s | FileCheck -check-prefixes=CHECK %s
+; RUN: llc -march=bpfeb -filetype=asm -o - %s | FileCheck -check-prefixes=CHECK %s
+
+; Source code:
+;   int * restrict p;
+; Compilation flag:
+;   clang -target bpf -O2 -g -S -emit-llvm t.c
+
+@p = common dso_local local_unnamed_addr global i32* null, align 8, !dbg !0
+
+!llvm.dbg.cu = !{!2}
+!llvm.module.flags = !{!9, !10, !11}
+!llvm.ident = !{!12}
+
+; CHECK:             .section        .BTF,"",@progbits
+; CHECK-NEXT:        .short  60319                   # 0xeb9f
+; CHECK-NEXT:        .byte   1
+; CHECK-NEXT:        .byte   0
+; CHECK-NEXT:        .long   24
+; CHECK-NEXT:        .long   0
+; CHECK-NEXT:        .long   40
+; CHECK-NEXT:        .long   40
+; CHECK-NEXT:        .long   5
+; CHECK-NEXT:        .long   0                       # BTF_KIND_RESTRICT(id = 1)
+; CHECK-NEXT:        .long   184549376               # 0xb000000
+; CHECK-NEXT:        .long   2
+; CHECK-NEXT:        .long   0                       # BTF_KIND_PTR(id = 2)
+; CHECK-NEXT:        .long   33554432                # 0x2000000
+; CHECK-NEXT:        .long   3
+; CHECK-NEXT:        .long   1                       # BTF_KIND_INT(id = 3)
+; CHECK-NEXT:        .long   16777216                # 0x1000000
+; CHECK-NEXT:        .long   4
+; CHECK-NEXT:        .long   16777248                # 0x1000020
+; CHECK-NEXT:        .byte   0                       # string offset=0
+; CHECK-NEXT:        .ascii  "int"                   # string offset=1
+; CHECK-NEXT:        .byte   0
+; CHECK-NEXT:        .section        .BTF.ext,"",@progbits
+; CHECK-NEXT:        .short  60319                   # 0xeb9f
+; CHECK-NEXT:        .byte   1
+; CHECK-NEXT:        .byte   0
+; CHECK-NEXT:        .long   24
+; CHECK-NEXT:        .long   0
+; CHECK-NEXT:        .long   4
+; CHECK-NEXT:        .long   4
+; CHECK-NEXT:        .long   4
+; CHECK-NEXT:        .long   8                       # FuncInfo
+; CHECK-NEXT:        .long   16                      # LineInfo
+
+!0 = !DIGlobalVariableExpression(var: !1, expr: !DIExpression())
+!1 = distinct !DIGlobalVariable(name: "p", scope: !2, file: !3, line: 1, type: !6, isLocal: false, isDefinition: true)
+!2 = distinct !DICompileUnit(language: DW_LANG_C99, file: !3, producer: "clang version 8.0.0 (trunk 344789) (llvm/trunk 344782)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !4, globals: !5, nameTableKind: None)
+!3 = !DIFile(filename: "t.c", directory: "/home/yhs/tmp")
+!4 = !{}
+!5 = !{!0}
+!6 = !DIDerivedType(tag: DW_TAG_restrict_type, baseType: !7)
+!7 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !8, size: 64)
+!8 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
+!9 = !{i32 2, !"Dwarf Version", i32 4}
+!10 = !{i32 2, !"Debug Info Version", i32 3}
+!11 = !{i32 1, !"wchar_size", i32 4}
+!12 = !{!"clang version 8.0.0 (trunk 344789) (llvm/trunk 344782)"}

test/CodeGen/BPF/BTF/short.ll

+; RUN: llc -march=bpfel -filetype=asm -o - %s | FileCheck -check-prefixes=CHECK %s
+; RUN: llc -march=bpfeb -filetype=asm -o - %s | FileCheck -check-prefixes=CHECK %s
+
+; Source code:
+;   short a;
+; Compilation flag:
+;   clang -target bpf -O2 -g -S -emit-llvm t.c
+
+
+@a = common dso_local local_unnamed_addr global i16 0, align 2, !dbg !0
+
+!llvm.dbg.cu = !{!2}
+!llvm.module.flags = !{!7, !8, !9}
+!llvm.ident = !{!10}
+
+; CHECK:             .section        .BTF,"",@progbits
+; CHECK-NEXT:        .short  60319                   # 0xeb9f
+; CHECK-NEXT:        .byte   1
+; CHECK-NEXT:        .byte   0
+; CHECK-NEXT:        .long   24
+; CHECK-NEXT:        .long   0
+; CHECK-NEXT:        .long   16
+; CHECK-NEXT:        .long   16
+; CHECK-NEXT:        .long   7
+; CHECK-NEXT:        .long   1                       # BTF_KIND_INT(id = 1)
+; CHECK-NEXT:        .long   16777216                # 0x1000000
+; CHECK-NEXT:        .long   2
+; CHECK-NEXT:        .long   16777232                # 0x1000010
+; CHECK-NEXT:        .byte   0                       # string offset=0
+; CHECK-NEXT:        .ascii  "short"                 # string offset=1
+; CHECK-NEXT:        .byte   0
+; CHECK-NEXT:        .section        .BTF.ext,"",@progbits
+; CHECK-NEXT:        .short  60319                   # 0xeb9f
+; CHECK-NEXT:        .byte   1
+; CHECK-NEXT:        .byte   0
+; CHECK-NEXT:        .long   24
+; CHECK-NEXT:        .long   0
+; CHECK-NEXT:        .long   4
+; CHECK-NEXT:        .long   4
+; CHECK-NEXT:        .long   4
+; CHECK-NEXT:        .long   8                       # FuncInfo
+; CHECK-NEXT:        .long   16                      # LineInfo
+
+!0 = !DIGlobalVariableExpression(var: !1, expr: !DIExpression())
+!1 = distinct !DIGlobalVariable(name: "a", scope: !2, file: !3, line: 1, type: !6, isLocal: false, isDefinition: true)
+!2 = distinct !DICompileUnit(language: DW_LANG_C99, file: !3, producer: "clang version 8.0.0 (trunk 344789) (llvm/trunk 344782)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !4, globals: !5, nameTableKind: None)
+!3 = !DIFile(filename: "t.c", directory: "/home/yhs/tmp")
+!4 = !{}
+!5 = !{!0}
+!6 = !DIBasicType(name: "short", size: 16, encoding: DW_ATE_signed)
+!7 = !{i32 2, !"Dwarf Version", i32 4}
+!8 = !{i32 2, !"Debug Info Version", i32 3}
+!9 = !{i32 1, !"wchar_size", i32 4}
+!10 = !{!"clang version 8.0.0 (trunk 344789) (llvm/trunk 344782)"}

test/CodeGen/BPF/BTF/struct-anon.ll

+; RUN: llc -march=bpfel -filetype=asm -o - %s | FileCheck -check-prefixes=CHECK %s
+; RUN: llc -march=bpfeb -filetype=asm -o - %s | FileCheck -check-prefixes=CHECK %s
+
+; Source code:
+;   struct { struct {int m;}; } a;
+; Compilation flag:
+;   clang -target bpf -O2 -g -S -emit-llvm t.c
+
+%struct.anon = type { %struct.anon.0 }
+%struct.anon.0 = type { i32 }
+
+@a = common dso_local local_unnamed_addr global %struct.anon zeroinitializer, align 4, !dbg !0
+
+!llvm.dbg.cu = !{!2}
+!llvm.module.flags = !{!13, !14, !15}
+!llvm.ident = !{!16}
+
+; CHECK:             .section        .BTF,"",@progbits
+; CHECK-NEXT:        .short  60319                   # 0xeb9f
+; CHECK-NEXT:        .byte   1
+; CHECK-NEXT:        .byte   0
+; CHECK-NEXT:        .long   24
+; CHECK-NEXT:        .long   0
+; CHECK-NEXT:        .long   64
+; CHECK-NEXT:        .long   64
+; CHECK-NEXT:        .long   7
+; CHECK-NEXT:        .long   0                       # BTF_KIND_STRUCT(id = 1)
+; CHECK-NEXT:        .long   67108865                # 0x4000001
+; CHECK-NEXT:        .long   4
+; CHECK-NEXT:        .long   0
+; CHECK-NEXT:        .long   2
+; CHECK-NEXT:        .long   0
+; CHECK-NEXT:        .long   0                       # BTF_KIND_STRUCT(id = 2)
+; CHECK-NEXT:        .long   67108865                # 0x4000001
+; CHECK-NEXT:        .long   4
+; CHECK-NEXT:        .long   1
+; CHECK-NEXT:        .long   3
+; CHECK-NEXT:        .long   0
+; CHECK-NEXT:        .long   3                       # BTF_KIND_INT(id = 3)
+; CHECK-NEXT:        .long   16777216                # 0x1000000
+; CHECK-NEXT:        .long   4
+; CHECK-NEXT:        .long   16777248                # 0x1000020
+; CHECK-NEXT:        .byte   0                       # string offset=0
+; CHECK-NEXT:        .byte   109                     # string offset=1
+; CHECK-NEXT:        .byte   0
+; CHECK-NEXT:        .ascii  "int"                   # string offset=3
+; CHECK-NEXT:        .byte   0
+; CHECK-NEXT:        .section        .BTF.ext,"",@progbits
+; CHECK-NEXT:        .short  60319                   # 0xeb9f
+; CHECK-NEXT:        .byte   1
+; CHECK-NEXT:        .byte   0
+; CHECK-NEXT:        .long   24
+; CHECK-NEXT:        .long   0
+; CHECK-NEXT:        .long   4
+; CHECK-NEXT:        .long   4
+; CHECK-NEXT:        .long   4
+; CHECK-NEXT:        .long   8                       # FuncInfo
+; CHECK-NEXT:        .long   16                      # LineInfo
+
+!0 = !DIGlobalVariableExpression(var: !1, expr: !DIExpression())
+!1 = distinct !DIGlobalVariable(name: "a", scope: !2, file: !3, line: 1, type: !6, isLocal: false, isDefinition: true)
+!2 = distinct !DICompileUnit(language: DW_LANG_C99, file: !3, producer: "clang version 8.0.0 (trunk 344789) (llvm/trunk 344782)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !4, globals: !5, nameTableKind: None)
+!3 = !DIFile(filename: "t.c", directory: "/home/yhs/tmp")
+!4 = !{}
+!5 = !{!0}
+!6 = distinct !DICompositeType(tag: DW_TAG_structure_type, file: !3, line: 1, size: 32, elements: !7)
+!7 = !{!8}
+!8 = !DIDerivedType(tag: DW_TAG_member, scope: !6, file: !3, line: 1, baseType: !9, size: 32)
+!9 = distinct !DICompositeType(tag: DW_TAG_structure_type, scope: !6, file: !3, line: 1, size: 32, elements: !10)
+!10 = !{!11}
+!11 = !DIDerivedType(tag: DW_TAG_member, name: "m", scope: !9, file: !3, line: 1, baseType: !12, size: 32)
+!12 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
+!13 = !{i32 2, !"Dwarf Version", i32 4}
+!14 = !{i32 2, !"Debug Info Version", i32 3}
+!15 = !{i32 1, !"wchar_size", i32 4}
+!16 = !{!"clang version 8.0.0 (trunk 344789) (llvm/trunk 344782)"}

test/CodeGen/BPF/BTF/struct-basic.ll

+; RUN: llc -march=bpfel -filetype=asm -o - %s | FileCheck -check-prefixes=CHECK %s
+; RUN: llc -march=bpfeb -filetype=asm -o - %s | FileCheck -check-prefixes=CHECK %s
+
+; Source code:
+;   struct t1 {char m1; int n1;} a;
+; Compilation flag:
+;   clang -target bpf -O2 -g -S -emit-llvm t.c
+
+%struct.t1 = type { i8, i32 }
+
+@a = common dso_local local_unnamed_addr global %struct.t1 zeroinitializer, align 4, !dbg !0
+
+!llvm.dbg.cu = !{!2}
+!llvm.module.flags = !{!12, !13, !14}
+!llvm.ident = !{!15}
+
+; CHECK:             .section        .BTF,"",@progbits
+; CHECK-NEXT:        .short  60319                   # 0xeb9f
+; CHECK-NEXT:        .byte   1
+; CHECK-NEXT:        .byte   0
+; CHECK-NEXT:        .long   24
+; CHECK-NEXT:        .long   0
+; CHECK-NEXT:        .long   68
+; CHECK-NEXT:        .long   68
+; CHECK-NEXT:        .long   19
+; CHECK-NEXT:        .long   1                       # BTF_KIND_STRUCT(id = 1)
+; CHECK-NEXT:        .long   67108866                # 0x4000002
+; CHECK-NEXT:        .long   8
+; CHECK-NEXT:        .long   4
+; CHECK-NEXT:        .long   2
+; CHECK-NEXT:        .long   0
+; CHECK-NEXT:        .long   7
+; CHECK-NEXT:        .long   3
+; CHECK-NEXT:        .long   32
+; CHECK-NEXT:        .long   10                      # BTF_KIND_INT(id = 2)
+; CHECK-NEXT:        .long   16777216                # 0x1000000
+; CHECK-NEXT:        .long   1
+; CHECK-NEXT:        .long   16777224                # 0x1000008
+; CHECK-NEXT:        .long   15                      # BTF_KIND_INT(id = 3)
+; CHECK-NEXT:        .long   16777216                # 0x1000000
+; CHECK-NEXT:        .long   4
+; CHECK-NEXT:        .long   16777248                # 0x1000020
+; CHECK-NEXT:        .byte   0                       # string offset=0
+; CHECK-NEXT:        .ascii  "t1"                    # string offset=1
+; CHECK-NEXT:        .byte   0
+; CHECK-NEXT:        .ascii  "m1"                    # string offset=4
+; CHECK-NEXT:        .byte   0
+; CHECK-NEXT:        .ascii  "n1"                    # string offset=7
+; CHECK-NEXT:        .byte   0
+; CHECK-NEXT:        .ascii  "char"                  # string offset=10
+; CHECK-NEXT:        .byte   0
+; CHECK-NEXT:        .ascii  "int"                   # string offset=15
+; CHECK-NEXT:        .byte   0
+; CHECK-NEXT:        .section        .BTF.ext,"",@progbits
+; CHECK-NEXT:        .short  60319                   # 0xeb9f
+; CHECK-NEXT:        .byte   1
+; CHECK-NEXT:        .byte   0
+; CHECK-NEXT:        .long   24
+; CHECK-NEXT:        .long   0
+; CHECK-NEXT:        .long   4
+; CHECK-NEXT:        .long   4
+; CHECK-NEXT:        .long   4
+; CHECK-NEXT:        .long   8                       # FuncInfo
+; CHECK-NEXT:        .long   16                      # LineInfo
+
+!0 = !DIGlobalVariableExpression(var: !1, expr: !DIExpression())
+!1 = distinct !DIGlobalVariable(name: "a", scope: !2, file: !3, line: 1, type: !6, isLocal: false, isDefinition: true)
+!2 = distinct !DICompileUnit(language: DW_LANG_C99, file: !3, producer: "clang version 8.0.0 (trunk 345296) (llvm/trunk 345297)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !4, globals: !5, nameTableKind: None)
+!3 = !DIFile(filename: "t.c", directory: "/home/yhs/tmp")
+!4 = !{}
+!5 = !{!0}
+!6 = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "t1", file: !3, line: 1, size: 64, elements: !7)
+!7 = !{!8, !10}
+!8 = !DIDerivedType(tag: DW_TAG_member, name: "m1", scope: !6, file: !3, line: 1, baseType: !9, size: 8)
+!9 = !DIBasicType(name: "char", size: 8, encoding: DW_ATE_signed_char)
+!10 = !DIDerivedType(tag: DW_TAG_member, name: "n1", scope: !6, file: !3, line: 1, baseType: !11, size: 32, offset: 32)
+!11 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
+!12 = !{i32 2, !"Dwarf Version", i32 4}
+!13 = !{i32 2, !"Debug Info Version", i32 3}
+!14 = !{i32 1, !"wchar_size", i32 4}
+!15 = !{!"clang version 8.0.0 (trunk 345296) (llvm/trunk 345297)"}

test/CodeGen/BPF/BTF/struct-bitfield-typedef.ll

+; RUN: llc -march=bpfel -filetype=asm -o - %s | FileCheck -check-prefixes=CHECK %s
+; RUN: llc -march=bpfeb -filetype=asm -o - %s | FileCheck -check-prefixes=CHECK %s
+
+; Source code:
+;   typedef int _int;
+;   typedef _int __int;
+;   struct {char m:2; __int n:3; char p;} a;
+; Compilation flag:
+;   clang -target bpf -O2 -g -S -emit-llvm t.c
+
+%struct.anon = type { i8, i8, [2 x i8] }
+
+@a = common dso_local local_unnamed_addr global %struct.anon zeroinitializer, align 4, !dbg !0
+
+!llvm.dbg.cu = !{!2}
+!llvm.module.flags = !{!15, !16, !17}
+!llvm.ident = !{!18}
+
+; CHECK:             .section        .BTF,"",@progbits
+; CHECK-NEXT:        .short  60319                   # 0xeb9f
+; CHECK-NEXT:        .byte   1
+; CHECK-NEXT:        .byte   0
+; CHECK-NEXT:        .long   24
+; CHECK-NEXT:        .long   0
+; CHECK-NEXT:        .long   104
+; CHECK-NEXT:        .long   104
+; CHECK-NEXT:        .long   27
+; CHECK-NEXT:        .long   0                       # BTF_KIND_STRUCT(id = 1)
+; CHECK-NEXT:        .long   2214592515              # 0x84000003
+; CHECK-NEXT:        .long   4
+; CHECK-NEXT:        .long   1
+; CHECK-NEXT:        .long   2
+; CHECK-NEXT:        .long   33554432                # 0x2000000
+; CHECK-NEXT:        .long   3
+; CHECK-NEXT:        .long   3
+; CHECK-NEXT:        .long   50331650                # 0x3000002
+; CHECK-NEXT:        .long   5
+; CHECK-NEXT:        .long   2
+; CHECK-NEXT:        .long   8                       # 0x8
+; CHECK-NEXT:        .long   7                       # BTF_KIND_INT(id = 2)
+; CHECK-NEXT:        .long   16777216                # 0x1000000
+; CHECK-NEXT:        .long   1
+; CHECK-NEXT:        .long   16777224                # 0x1000008
+; CHECK-NEXT:        .long   12                      # BTF_KIND_TYPEDEF(id = 3)
+; CHECK-NEXT:        .long   134217728               # 0x8000000
+; CHECK-NEXT:        .long   4
+; CHECK-NEXT:        .long   18                      # BTF_KIND_TYPEDEF(id = 4)
+; CHECK-NEXT:        .long   134217728               # 0x8000000
+; CHECK-NEXT:        .long   5
+; CHECK-NEXT:        .long   23                      # BTF_KIND_INT(id = 5)
+; CHECK-NEXT:        .long   16777216                # 0x1000000
+; CHECK-NEXT:        .long   4
+; CHECK-NEXT:        .long   16777248                # 0x1000020
+; CHECK-NEXT:        .byte   0                       # string offset=0
+; CHECK-NEXT:        .byte   109                     # string offset=1
+; CHECK-NEXT:        .byte   0
+; CHECK-NEXT:        .byte   110                     # string offset=3
+; CHECK-NEXT:        .byte   0
+; CHECK-NEXT:        .byte   112                     # string offset=5
+; CHECK-NEXT:        .byte   0
+; CHECK-NEXT:        .ascii  "char"                  # string offset=7
+; CHECK-NEXT:        .byte   0
+; CHECK-NEXT:        .ascii  "__int"                 # string offset=12
+; CHECK-NEXT:        .byte   0
+; CHECK-NEXT:        .ascii  "_int"                  # string offset=18
+; CHECK-NEXT:        .byte   0
+; CHECK-NEXT:        .ascii  "int"                   # string offset=23
+; CHECK-NEXT:        .byte   0
+; CHECK-NEXT:        .section        .BTF.ext,"",@progbits
+; CHECK-NEXT:        .short  60319                   # 0xeb9f
+; CHECK-NEXT:        .byte   1
+; CHECK-NEXT:        .byte   0
+; CHECK-NEXT:        .long   24
+; CHECK-NEXT:        .long   0
+; CHECK-NEXT:        .long   4
+; CHECK-NEXT:        .long   4
+; CHECK-NEXT:        .long   4
+; CHECK-NEXT:        .long   8                       # FuncInfo
+; CHECK-NEXT:        .long   16                      # LineInfo
+
+!0 = !DIGlobalVariableExpression(var: !1, expr: !DIExpression())
+!1 = distinct !DIGlobalVariable(name: "a", scope: !2, file: !3, line: 3, type: !6, isLocal: false, isDefinition: true)
+!2 = distinct !DICompileUnit(language: DW_LANG_C99, file: !3, producer: "clang version 8.0.0 (trunk 345296) (llvm/trunk 345297)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !4, globals: !5, nameTableKind: None)
+!3 = !DIFile(filename: "t.c", directory: "/home/yhs/tmp")
+!4 = !{}
+!5 = !{!0}
+!6 = distinct !DICompositeType(tag: DW_TAG_structure_type, file: !3, line: 3, size: 32, elements: !7)
+!7 = !{!8, !10, !14}
+!8 = !DIDerivedType(tag: DW_TAG_member, name: "m", scope: !6, file: !3, line: 3, baseType: !9, size: 2, flags: DIFlagBitField, extraData: i64 0)
+!9 = !DIBasicType(name: "char", size: 8, encoding: DW_ATE_signed_char)
+!10 = !DIDerivedType(tag: DW_TAG_member, name: "n", scope: !6, file: !3, line: 3, baseType: !11, size: 3, offset: 2, flags: DIFlagBitField, extraData: i64 0)
+!11 = !DIDerivedType(tag: DW_TAG_typedef, name: "__int", file: !3, line: 2, baseType: !12)
+!12 = !DIDerivedType(tag: DW_TAG_typedef, name: "_int", file: !3, line: 1, baseType: !13)
+!13 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
+!14 = !DIDerivedType(tag: DW_TAG_member, name: "p", scope: !6, file: !3, line: 3, baseType: !9, size: 8, offset: 8)
+!15 = !{i32 2, !"Dwarf Version", i32 4}
+!16 = !{i32 2, !"Debug Info Version", i32 3}
+!17 = !{i32 1, !"wchar_size", i32 4}
+!18 = !{!"clang version 8.0.0 (trunk 345296) (llvm/trunk 345297)"}

test/CodeGen/BPF/BTF/struct-enum.ll

+; RUN: llc -march=bpfel -filetype=asm -o - %s | FileCheck -check-prefixes=CHECK %s
+; RUN: llc -march=bpfeb -filetype=asm -o - %s | FileCheck -check-prefixes=CHECK %s
+
+; Source code:
+;   enum t1 { A , B };
+;   struct t2 { enum t1 m:2; enum t1 n; } a;
+; Compilation flag:
+;   clang -target bpf -O2 -g -S -emit-llvm t.c
+
+%struct.t2 = type { i8, i32 }
+
+@a = common dso_local local_unnamed_addr global %struct.t2 zeroinitializer, align 4, !dbg !0
+
+!llvm.dbg.cu = !{!2}
+!llvm.module.flags = !{!15, !16, !17}
+!llvm.ident = !{!18}
+
+; CHECK:             .section        .BTF,"",@progbits
+; CHECK-NEXT:        .short  60319                   # 0xeb9f
+; CHECK-NEXT:        .byte   1
+; CHECK-NEXT:        .byte   0
+; CHECK-NEXT:        .long   24
+; CHECK-NEXT:        .long   0
+; CHECK-NEXT:        .long   64
+; CHECK-NEXT:        .long   64
+; CHECK-NEXT:        .long   15
+; CHECK-NEXT:        .long   1                       # BTF_KIND_STRUCT(id = 1)
+; CHECK-NEXT:        .long   2214592514              # 0x84000002
+; CHECK-NEXT:        .long   8
+; CHECK-NEXT:        .long   4
+; CHECK-NEXT:        .long   2
+; CHECK-NEXT:        .long   33554432                # 0x2000000
+; CHECK-NEXT:        .long   6
+; CHECK-NEXT:        .long   2
+; CHECK-NEXT:        .long   32                      # 0x20
+; CHECK-NEXT:        .long   8                       # BTF_KIND_ENUM(id = 2)
+; CHECK-NEXT:        .long   100663298               # 0x6000002
+; CHECK-NEXT:        .long   4
+; CHECK-NEXT:        .long   11
+; CHECK-NEXT:        .long   0
+; CHECK-NEXT:        .long   13
+; CHECK-NEXT:        .long   1
+; CHECK-NEXT:        .byte   0                       # string offset=0
+; CHECK-NEXT:        .ascii  "t2"                    # string offset=1
+; CHECK-NEXT:        .byte   0
+; CHECK-NEXT:        .byte   109                     # string offset=4
+; CHECK-NEXT:        .byte   0
+; CHECK-NEXT:        .byte   110                     # string offset=6
+; CHECK-NEXT:        .byte   0
+; CHECK-NEXT:        .ascii  "t1"                    # string offset=8
+; CHECK-NEXT:        .byte   0
+; CHECK-NEXT:        .byte   65                      # string offset=11
+; CHECK-NEXT:        .byte   0
+; CHECK-NEXT:        .byte   66                      # string offset=13
+; CHECK-NEXT:        .byte   0
+; CHECK-NEXT:        .section        .BTF.ext,"",@progbits
+; CHECK-NEXT:        .short  60319                   # 0xeb9f
+; CHECK-NEXT:        .byte   1
+; CHECK-NEXT:        .byte   0
+; CHECK-NEXT:        .long   24
+; CHECK-NEXT:        .long   0
+; CHECK-NEXT:        .long   4
+; CHECK-NEXT:        .long   4
+; CHECK-NEXT:        .long   4
+; CHECK-NEXT:        .long   8                       # FuncInfo
+; CHECK-NEXT:        .long   16                      # LineInfo
+
+!0 = !DIGlobalVariableExpression(var: !1, expr: !DIExpression())
+!1 = distinct !DIGlobalVariable(name: "a", scope: !2, file: !3, line: 2, type: !11, isLocal: false, isDefinition: true)
+!2 = distinct !DICompileUnit(language: DW_LANG_C99, file: !3, producer: "clang version 8.0.0 (trunk 344789) (llvm/trunk 344782)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !4, globals: !10, nameTableKind: None)
+!3 = !DIFile(filename: "t.c", directory: "/home/yhs/tmp")
+!4 = !{!5}
+!5 = !DICompositeType(tag: DW_TAG_enumeration_type, name: "t1", file: !3, line: 1, baseType: !6, size: 32, elements: !7)
+!6 = !DIBasicType(name: "unsigned int", size: 32, encoding: DW_ATE_unsigned)
+!7 = !{!8, !9}
+!8 = !DIEnumerator(name: "A", value: 0, isUnsigned: true)
+!9 = !DIEnumerator(name: "B", value: 1, isUnsigned: true)
+!10 = !{!0}
+!11 = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "t2", file: !3, line: 2, size: 64, elements: !12)
+!12 = !{!13, !14}
+!13 = !DIDerivedType(tag: DW_TAG_member, name: "m", scope: !11, file: !3, line: 2, baseType: !5, size: 2, flags: DIFlagBitField, extraData: i64 0)
+!14 = !DIDerivedType(tag: DW_TAG_member, name: "n", scope: !11, file: !3, line: 2, baseType: !5, size: 32, offset: 32)
+!15 = !{i32 2, !"Dwarf Version", i32 4}
+!16 = !{i32 2, !"Debug Info Version", i32 3}
+!17 = !{i32 1, !"wchar_size", i32 4}
+!18 = !{!"clang version 8.0.0 (trunk 344789) (llvm/trunk 344782)"}

test/CodeGen/BPF/BTF/uchar.ll

+; RUN: llc -march=bpfel -filetype=asm -o - %s | FileCheck -check-prefixes=CHECK %s
+; RUN: llc -march=bpfeb -filetype=asm -o - %s | FileCheck -check-prefixes=CHECK %s
+
+; Source code:
+;   unsigned char a;
+; Compilation flag:
+;   clang -target bpf -O2 -g -S -emit-llvm t.c
+
+@a = common dso_local local_unnamed_addr global i8 0, align 1, !dbg !0
+
+!llvm.dbg.cu = !{!2}
+!llvm.module.flags = !{!7, !8, !9}
+!llvm.ident = !{!10}
+
+; CHECK:             .section        .BTF,"",@progbits
+; CHECK-NEXT:        .short  60319                   # 0xeb9f
+; CHECK-NEXT:        .byte   1
+; CHECK-NEXT:        .byte   0
+; CHECK-NEXT:        .long   24
+; CHECK-NEXT:        .long   0
+; CHECK-NEXT:        .long   16
+; CHECK-NEXT:        .long   16
+; CHECK-NEXT:        .long   15
+; CHECK-NEXT:        .long   1                       # BTF_KIND_INT(id = 1)
+; CHECK-NEXT:        .long   16777216                # 0x1000000
+; CHECK-NEXT:        .long   1
+; CHECK-NEXT:        .long   8                       # 0x8
+; CHECK-NEXT:        .byte   0                       # string offset=0
+; CHECK-NEXT:        .ascii  "unsigned char"         # string offset=1
+; CHECK-NEXT:        .byte   0
+; CHECK-NEXT:        .section        .BTF.ext,"",@progbits
+; CHECK-NEXT:        .short  60319                   # 0xeb9f
+; CHECK-NEXT:        .byte   1
+; CHECK-NEXT:        .byte   0
+; CHECK-NEXT:        .long   24
+; CHECK-NEXT:        .long   0
+; CHECK-NEXT:        .long   4
+; CHECK-NEXT:        .long   4
+; CHECK-NEXT:        .long   4
+; CHECK-NEXT:        .long   8                       # FuncInfo
+; CHECK-NEXT:        .long   16                      # LineInfo
+
+!0 = !DIGlobalVariableExpression(var: !1, expr: !DIExpression())
+!1 = distinct !DIGlobalVariable(name: "a", scope: !2, file: !3, line: 1, type: !6, isLocal: false, isDefinition: true)
+!2 = distinct !DICompileUnit(language: DW_LANG_C99, file: !3, producer: "clang version 8.0.0 (trunk 345296) (llvm/trunk 345297)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !4, globals: !5, nameTableKind: None)
+!3 = !DIFile(filename: "t.c", directory: "/home/yhs/tmp")
+!4 = !{}
+!5 = !{!0}
+!6 = !DIBasicType(name: "unsigned char", size: 8, encoding: DW_ATE_unsigned_char)
+!7 = !{i32 2, !"Dwarf Version", i32 4}
+!8 = !{i32 2, !"Debug Info Version", i32 3}
+!9 = !{i32 1, !"wchar_size", i32 4}
+!10 = !{!"clang version 8.0.0 (trunk 345296) (llvm/trunk 345297)"}

test/CodeGen/BPF/BTF/uint.ll

+; RUN: llc -march=bpfel -filetype=asm -o - %s | FileCheck -check-prefixes=CHECK %s
+; RUN: llc -march=bpfeb -filetype=asm -o - %s | FileCheck -check-prefixes=CHECK %s
+
+; Source code:
+;   unsigned a;
+; Compilation flag:
+;   clang -target bpf -O2 -g -S -emit-llvm t.c
+
+@a = common dso_local local_unnamed_addr global i32 0, align 4, !dbg !0
+
+!llvm.dbg.cu = !{!2}
+!llvm.module.flags = !{!7, !8, !9}
+!llvm.ident = !{!10}
+
+; CHECK:             .section        .BTF,"",@progbits
+; CHECK-NEXT:        .short  60319                   # 0xeb9f
+; CHECK-NEXT:        .byte   1
+; CHECK-NEXT:        .byte   0
+; CHECK-NEXT:        .long   24
+; CHECK-NEXT:        .long   0
+; CHECK-NEXT:        .long   16
+; CHECK-NEXT:        .long   16
+; CHECK-NEXT:        .long   14
+; CHECK-NEXT:        .long   1                       # BTF_KIND_INT(id = 1)
+; CHECK-NEXT:        .long   16777216                # 0x1000000
+; CHECK-NEXT:        .long   4
+; CHECK-NEXT:        .long   32                      # 0x20
+; CHECK-NEXT:        .byte   0                       # string offset=0
+; CHECK-NEXT:        .ascii  "unsigned int"          # string offset=1
+; CHECK-NEXT:        .byte   0
+; CHECK-NEXT:        .section        .BTF.ext,"",@progbits
+; CHECK-NEXT:        .short  60319                   # 0xeb9f
+; CHECK-NEXT:        .byte   1
+; CHECK-NEXT:        .byte   0
+; CHECK-NEXT:        .long   24
+; CHECK-NEXT:        .long   0
+; CHECK-NEXT:        .long   4
+; CHECK-NEXT:        .long   4
+; CHECK-NEXT:        .long   4
+; CHECK-NEXT:        .long   8                       # FuncInfo
+; CHECK-NEXT:        .long   16                      # LineInfo
+
+!0 = !DIGlobalVariableExpression(var: !1, expr: !DIExpression())
+!1 = distinct !DIGlobalVariable(name: "a", scope: !2, file: !3, line: 1, type: !6, isLocal: false, isDefinition: true)
+!2 = distinct !DICompileUnit(language: DW_LANG_C99, file: !3, producer: "clang version 8.0.0 (trunk 344789) (llvm/trunk 344782)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !4, globals: !5, nameTableKind: None)
+!3 = !DIFile(filename: "t.c", directory: "/home/yhs/tmp")
+!4 = !{}
+!5 = !{!0}
+!6 = !DIBasicType(name: "unsigned int", size: 32, encoding: DW_ATE_unsigned)
+!7 = !{i32 2, !"Dwarf Version", i32 4}
+!8 = !{i32 2, !"Debug Info Version", i32 3}
+!9 = !{i32 1, !"wchar_size", i32 4}
+!10 = !{!"clang version 8.0.0 (trunk 344789) (llvm/trunk 344782)"}

test/CodeGen/BPF/BTF/ulonglong.ll

+; RUN: llc -march=bpfel -filetype=asm -o - %s | FileCheck -check-prefixes=CHECK %s
+; RUN: llc -march=bpfeb -filetype=asm -o - %s | FileCheck -check-prefixes=CHECK %s
+
+; Source code:
+;   unsigned long long a;
+; Compilation flag:
+;   clang -target bpf -O2 -g -S -emit-llvm t.c
+
+@a = common dso_local local_unnamed_addr global i64 0, align 8, !dbg !0
+
+!llvm.dbg.cu = !{!2}
+!llvm.module.flags = !{!7, !8, !9}
+!llvm.ident = !{!10}
+
+; CHECK:             .section        .BTF,"",@progbits
+; CHECK-NEXT:        .short  60319                   # 0xeb9f
+; CHECK-NEXT:        .byte   1
+; CHECK-NEXT:        .byte   0
+; CHECK-NEXT:        .long   24
+; CHECK-NEXT:        .long   0
+; CHECK-NEXT:        .long   16
+; CHECK-NEXT:        .long   16
+; CHECK-NEXT:        .long   24
+; CHECK-NEXT:        .long   1                       # BTF_KIND_INT(id = 1)
+; CHECK-NEXT:        .long   16777216                # 0x1000000
+; CHECK-NEXT:        .long   8
+; CHECK-NEXT:        .long   64                      # 0x40
+; CHECK-NEXT:        .byte   0                       # string offset=0
+; CHECK-NEXT:        .ascii  "long long unsigned int" # string offset=1
+; CHECK-NEXT:        .byte   0
+; CHECK-NEXT:        .section        .BTF.ext,"",@progbits
+; CHECK-NEXT:        .short  60319                   # 0xeb9f
+; CHECK-NEXT:        .byte   1
+; CHECK-NEXT:        .byte   0
+; CHECK-NEXT:        .long   24
+; CHECK-NEXT:        .long   0
+; CHECK-NEXT:        .long   4
+; CHECK-NEXT:        .long   4
+; CHECK-NEXT:        .long   4
+; CHECK-NEXT:        .long   8                       # FuncInfo
+; CHECK-NEXT:        .long   16                      # LineInfo
+
+!0 = !DIGlobalVariableExpression(var: !1, expr: !DIExpression())
+!1 = distinct !DIGlobalVariable(name: "a", scope: !2, file: !3, line: 1, type: !6, isLocal: false, isDefinition: true)
+!2 = distinct !DICompileUnit(language: DW_LANG_C99, file: !3, producer: "clang version 8.0.0 (trunk 344789) (llvm/trunk 344782)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !4, globals: !5, nameTableKind: None)
+!3 = !DIFile(filename: "t.c", directory: "/home/yhs/tmp")
+!4 = !{}
+!5 = !{!0}
+!6 = !DIBasicType(name: "long long unsigned int", size: 64, encoding: DW_ATE_unsigned)
+!7 = !{i32 2, !"Dwarf Version", i32 4}
+!8 = !{i32 2, !"Debug Info Version", i32 3}
+!9 = !{i32 1, !"wchar_size", i32 4}
+!10 = !{!"clang version 8.0.0 (trunk 344789) (llvm/trunk 344782)"}

test/CodeGen/BPF/BTF/union-array-typedef.ll

+; RUN: llc -march=bpfel -filetype=asm -o - %s | FileCheck -check-prefixes=CHECK %s
+; RUN: llc -march=bpfeb -filetype=asm -o - %s | FileCheck -check-prefixes=CHECK %s
+
+; Source code:
+;   typedef int _int;
+;   union t {char m[4]; _int n;} a;
+; Compilation flag:
+;   clang -target bpf -O2 -g -S -emit-llvm t.c
+
+%union.t = type { i32 }
+
+@a = common dso_local local_unnamed_addr global %union.t zeroinitializer, align 4, !dbg !0
+
+!llvm.dbg.cu = !{!2}
+!llvm.module.flags = !{!16, !17, !18}
+!llvm.ident = !{!19}
+
+; CHECK:             .section        .BTF,"",@progbits
+; CHECK-NEXT:        .short  60319                   # 0xeb9f
+; CHECK-NEXT:        .byte   1
+; CHECK-NEXT:        .byte   0
+; CHECK-NEXT:        .long   24
+; CHECK-NEXT:        .long   0
+; CHECK-NEXT:        .long   120
+; CHECK-NEXT:        .long   120
+; CHECK-NEXT:        .long   41
+; CHECK-NEXT:        .long   1                       # BTF_KIND_UNION(id = 1)
+; CHECK-NEXT:        .long   83886082                # 0x5000002
+; CHECK-NEXT:        .long   4
+; CHECK-NEXT:        .long   3
+; CHECK-NEXT:        .long   2
+; CHECK-NEXT:        .long   0
+; CHECK-NEXT:        .long   5
+; CHECK-NEXT:        .long   5
+; CHECK-NEXT:        .long   0
+; CHECK-NEXT:        .long   0                       # BTF_KIND_ARRAY(id = 2)
+; CHECK-NEXT:        .long   50331648                # 0x3000000
+; CHECK-NEXT:        .long   0
+; CHECK-NEXT:        .long   4
+; CHECK-NEXT:        .long   3
+; CHECK-NEXT:        .long   4
+; CHECK-NEXT:        .long   7                       # BTF_KIND_INT(id = 3)
+; CHECK-NEXT:        .long   16777216                # 0x1000000
+; CHECK-NEXT:        .long   4
+; CHECK-NEXT:        .long   32                      # 0x20
+; CHECK-NEXT:        .long   27                      # BTF_KIND_INT(id = 4)
+; CHECK-NEXT:        .long   16777216                # 0x1000000
+; CHECK-NEXT:        .long   1
+; CHECK-NEXT:        .long   16777224                # 0x1000008
+; CHECK-NEXT:        .long   32                      # BTF_KIND_TYPEDEF(id = 5)
+; CHECK-NEXT:        .long   134217728               # 0x8000000
+; CHECK-NEXT:        .long   6
+; CHECK-NEXT:        .long   37                      # BTF_KIND_INT(id = 6)
+; CHECK-NEXT:        .long   16777216                # 0x1000000
+; CHECK-NEXT:        .long   4
+; CHECK-NEXT:        .long   16777248                # 0x1000020
+; CHECK-NEXT:        .byte   0                       # string offset=0
+; CHECK-NEXT:        .byte   116                     # string offset=1
+; CHECK-NEXT:        .byte   0
+; CHECK-NEXT:        .byte   109                     # string offset=3
+; CHECK-NEXT:        .byte   0
+; CHECK-NEXT:        .byte   110                     # string offset=5
+; CHECK-NEXT:        .byte   0
+; CHECK-NEXT:        .ascii  "__ARRAY_SIZE_TYPE__"   # string offset=7
+; CHECK-NEXT:        .byte   0
+; CHECK-NEXT:        .ascii  "char"                  # string offset=27
+; CHECK-NEXT:        .byte   0
+; CHECK-NEXT:        .ascii  "_int"                  # string offset=32
+; CHECK-NEXT:        .byte   0
+; CHECK-NEXT:        .ascii  "int"                   # string offset=37
+; CHECK-NEXT:        .byte   0
+; CHECK-NEXT:        .section        .BTF.ext,"",@progbits
+; CHECK-NEXT:        .short  60319                   # 0xeb9f
+; CHECK-NEXT:        .byte   1
+; CHECK-NEXT:        .byte   0
+; CHECK-NEXT:        .long   24
+; CHECK-NEXT:        .long   0
+; CHECK-NEXT:        .long   4
+; CHECK-NEXT:        .long   4
+; CHECK-NEXT:        .long   4
+; CHECK-NEXT:        .long   8                       # FuncInfo
+; CHECK-NEXT:        .long   16                      # LineInfo
+
+!0 = !DIGlobalVariableExpression(var: !1, expr: !DIExpression())
+!1 = distinct !DIGlobalVariable(name: "a", scope: !2, file: !3, line: 2, type: !6, isLocal: false, isDefinition: true)
+!2 = distinct !DICompileUnit(language: DW_LANG_C99, file: !3, producer: "clang version 8.0.0 (trunk 345296) (llvm/trunk 345297)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !4, globals: !5, nameTableKind: None)
+!3 = !DIFile(filename: "t.c", directory: "/home/yhs/tmp")
+!4 = !{}
+!5 = !{!0}
+!6 = distinct !DICompositeType(tag: DW_TAG_union_type, name: "t", file: !3, line: 2, size: 32, elements: !7)
+!7 = !{!8, !13}
+!8 = !DIDerivedType(tag: DW_TAG_member, name: "m", scope: !6, file: !3, line: 2, baseType: !9, size: 32)
+!9 = !DICompositeType(tag: DW_TAG_array_type, baseType: !10, size: 32, elements: !11)
+!10 = !DIBasicType(name: "char", size: 8, encoding: DW_ATE_signed_char)
+!11 = !{!12}
+!12 = !DISubrange(count: 4)
+!13 = !DIDerivedType(tag: DW_TAG_member, name: "n", scope: !6, file: !3, line: 2, baseType: !14, size: 32)
+!14 = !DIDerivedType(tag: DW_TAG_typedef, name: "_int", file: !3, line: 1, baseType: !15)
+!15 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
+!16 = !{i32 2, !"Dwarf Version", i32 4}
+!17 = !{i32 2, !"Debug Info Version", i32 3}
+!18 = !{i32 1, !"wchar_size", i32 4}
+!19 = !{!"clang version 8.0.0 (trunk 345296) (llvm/trunk 345297)"}

test/CodeGen/BPF/BTF/ushort.ll

+; RUN: llc -march=bpfel -filetype=asm -o - %s | FileCheck -check-prefixes=CHECK %s
+; RUN: llc -march=bpfeb -filetype=asm -o - %s | FileCheck -check-prefixes=CHECK %s
+
+; Source code:
+;   unsigned short a;
+; Compilation flag:
+;   clang -target bpf -O2 -g -S -emit-llvm t.c
+
+@a = common dso_local local_unnamed_addr global i16 0, align 2, !dbg !0
+
+!llvm.dbg.cu = !{!2}
+!llvm.module.flags = !{!7, !8, !9}
+!llvm.ident = !{!10}
+
+; CHECK:             .section        .BTF,"",@progbits
+; CHECK-NEXT:        .short  60319                   # 0xeb9f
+; CHECK-NEXT:        .byte   1
+; CHECK-NEXT:        .byte   0
+; CHECK-NEXT:        .long   24
+; CHECK-NEXT:        .long   0
+; CHECK-NEXT:        .long   16
+; CHECK-NEXT:        .long   16
+; CHECK-NEXT:        .long   16
+; CHECK-NEXT:        .long   1                       # BTF_KIND_INT(id = 1)
+; CHECK-NEXT:        .long   16777216                # 0x1000000
+; CHECK-NEXT:        .long   2
+; CHECK-NEXT:        .long   16                      # 0x10
+; CHECK-NEXT:        .byte   0                       # string offset=0
+; CHECK-NEXT:        .ascii  "unsigned short"        # string offset=1
+; CHECK-NEXT:        .byte   0
+; CHECK-NEXT:        .section        .BTF.ext,"",@progbits
+; CHECK-NEXT:        .short  60319                   # 0xeb9f
+; CHECK-NEXT:        .byte   1
+; CHECK-NEXT:        .byte   0
+; CHECK-NEXT:        .long   24
+; CHECK-NEXT:        .long   0
+; CHECK-NEXT:        .long   4
+; CHECK-NEXT:        .long   4
+; CHECK-NEXT:        .long   4
+; CHECK-NEXT:        .long   8                       # FuncInfo
+; CHECK-NEXT:        .long   16                      # LineInfo
+
+!0 = !DIGlobalVariableExpression(var: !1, expr: !DIExpression())
+!1 = distinct !DIGlobalVariable(name: "a", scope: !2, file: !3, line: 1, type: !6, isLocal: false, isDefinition: true)
+!2 = distinct !DICompileUnit(language: DW_LANG_C99, file: !3, producer: "clang version 8.0.0 (trunk 344789) (llvm/trunk 344782)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !4, globals: !5, nameTableKind: None)
+!3 = !DIFile(filename: "t.c", directory: "/home/yhs/tmp")
+!4 = !{}
+!5 = !{!0}
+!6 = !DIBasicType(name: "unsigned short", size: 16, encoding: DW_ATE_unsigned)
+!7 = !{i32 2, !"Dwarf Version", i32 4}
+!8 = !{i32 2, !"Debug Info Version", i32 3}
+!9 = !{i32 1, !"wchar_size", i32 4}
+!10 = !{!"clang version 8.0.0 (trunk 344789) (llvm/trunk 344782)"}