[BinaryFormat] Add .debug_names support

[labath]

Summary

This adds a definition of the .debug_names section and the new constants
(DW_IDX_???) which are used in it.

llvm/trunk/include/llvm/BinaryFormat/Dwarf.h

 /// Constants for unit types in DWARF v5.
 enum UnitType : unsigned char {
 #define HANDLE_DW_UT(ID, NAME) DW_UT_##NAME = ID,
 #include "llvm/BinaryFormat/Dwarf.def"
   DW_UT_lo_user = 0x80,
   DW_UT_hi_user = 0xff
 };
 
+enum Index {
+#define HANDLE_DW_IDX(ID, NAME) DW_IDX_##NAME = ID,
+#include "llvm/BinaryFormat/Dwarf.def"
+  DW_IDX_lo_user = 0x2000,
+  DW_IDX_hi_user = 0x3fff
+};
+
 inline bool isUnitType(uint8_t UnitType) {
   switch (UnitType) {
   case DW_UT_compile:
   case DW_UT_type:
   case DW_UT_partial:
   case DW_UT_skeleton:
   case DW_UT_split_compile:
   case DW_UT_split_type:

 StringRef LNExtendedString(unsigned Encoding);
 StringRef MacinfoString(unsigned Encoding);
 StringRef CallFrameString(unsigned Encoding);
 StringRef ApplePropertyString(unsigned);
 StringRef UnitTypeString(unsigned);
 StringRef AtomTypeString(unsigned Atom);
 StringRef GDBIndexEntryKindString(GDBIndexEntryKind Kind);
 StringRef GDBIndexEntryLinkageString(GDBIndexEntryLinkage Linkage);
+StringRef IndexString(unsigned Idx);
 /// @}
 
 /// \defgroup DwarfConstantsParsing Dwarf constants parsing functions
 ///
 /// These functions map their strings back to the corresponding enumeration
 /// value or return 0 if there is none, except for these exceptions:
 ///
 /// \li \a getTag() returns \a DW_TAG_invalid on invalid input.

llvm/trunk/include/llvm/BinaryFormat/Dwarf.def

 //===- llvm/Support/Dwarf.def - Dwarf 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 running through Dwarf enumerators.
 //
 //===----------------------------------------------------------------------===//
 
 // TODO: Add other DW-based macros.
-#if !(defined HANDLE_DW_TAG || defined HANDLE_DW_AT ||                         \
-      defined HANDLE_DW_FORM || defined HANDLE_DW_OP ||                        \
-      defined HANDLE_DW_LANG || defined HANDLE_DW_ATE ||                       \
-      defined HANDLE_DW_VIRTUALITY || defined HANDLE_DW_DEFAULTED ||           \
-      defined HANDLE_DW_CC || defined HANDLE_DW_LNS ||                         \
-      defined HANDLE_DW_LNE || defined HANDLE_DW_LNCT ||                       \
-      defined HANDLE_DW_MACRO || defined HANDLE_DW_RLE ||                      \
-      defined HANDLE_DW_CFA || defined HANDLE_DW_APPLE_PROPERTY ||             \
-      defined HANDLE_DW_UT || defined HANDLE_DWARF_SECTION)
+#if !(                                                                         \
+    defined HANDLE_DW_TAG || defined HANDLE_DW_AT || defined HANDLE_DW_FORM || \
+    defined HANDLE_DW_OP || defined HANDLE_DW_LANG || defined HANDLE_DW_ATE || \
+    defined HANDLE_DW_VIRTUALITY || defined HANDLE_DW_DEFAULTED ||             \
+    defined HANDLE_DW_CC || defined HANDLE_DW_LNS || defined HANDLE_DW_LNE ||  \
+    defined HANDLE_DW_LNCT || defined HANDLE_DW_MACRO ||                       \
+    defined HANDLE_DW_RLE || defined HANDLE_DW_CFA ||                          \
+    defined HANDLE_DW_APPLE_PROPERTY || defined HANDLE_DW_UT ||                \
+    defined HANDLE_DWARF_SECTION || defined HANDLE_DW_IDX)
 #error "Missing macro definition of HANDLE_DW*"
 #endif
 
 #ifndef HANDLE_DW_TAG
 #define HANDLE_DW_TAG(ID, NAME, VERSION, VENDOR)
 #endif
 
 #ifndef HANDLE_DW_AT

 #ifndef HANDLE_DW_UT
 #define HANDLE_DW_UT(ID, NAME)
 #endif
 
 #ifndef HANDLE_DWARF_SECTION
 #define HANDLE_DWARF_SECTION(ENUM_NAME, ELF_NAME, CMDLINE_NAME)
 #endif
 
+#ifndef HANDLE_DW_IDX
+#define HANDLE_DW_IDX(ID, NAME)
+#endif
+
 HANDLE_DW_TAG(0x0000, null, 2, DWARF)
 HANDLE_DW_TAG(0x0001, array_type, 2, DWARF)
 HANDLE_DW_TAG(0x0002, class_type, 2, DWARF)
 HANDLE_DW_TAG(0x0003, entry_point, 2, DWARF)
 HANDLE_DW_TAG(0x0004, enumeration_type, 2, DWARF)
 HANDLE_DW_TAG(0x0005, formal_parameter, 2, DWARF)
 HANDLE_DW_TAG(0x0008, imported_declaration, 2, DWARF)
 HANDLE_DW_TAG(0x000a, label, 2, DWARF)

 HANDLE_DWARF_SECTION(DebugAbbrev, ".debug_abbrev", "debug-abbrev")
 HANDLE_DWARF_SECTION(DebugAranges, ".debug_aranges", "debug-aranges")
 HANDLE_DWARF_SECTION(DebugInfo, ".debug_info", "debug-info")
 HANDLE_DWARF_SECTION(DebugTypes, ".debug_types", "debug-types")
 HANDLE_DWARF_SECTION(DebugLine, ".debug_line", "debug-line")
 HANDLE_DWARF_SECTION(DebugLoc, ".debug_loc", "debug-loc")
 HANDLE_DWARF_SECTION(DebugFrame, ".debug_frame", "debug-frame")
 HANDLE_DWARF_SECTION(DebugMacro, ".debug_macro", "debug-macro")
+HANDLE_DWARF_SECTION(DebugNames, ".debug_names", "debug-names")
 HANDLE_DWARF_SECTION(DebugRanges, ".debug_ranges", "debug-ranges")
 HANDLE_DWARF_SECTION(DebugPubnames, ".debug_pubnames", "debug-pubnames")
 HANDLE_DWARF_SECTION(DebugPubtypes, ".debug_pubtypes", "debug-pubtypes")
 HANDLE_DWARF_SECTION(DebugGnuPubnames, ".debug_gnu_pubnames", "debug-gnu-pubnames")
 HANDLE_DWARF_SECTION(DebugGnuPubtypes, ".debug_gnu_pubtypes", "debug-gnu-pubtypes")
 HANDLE_DWARF_SECTION(DebugStr, ".debug_str", "debug-str")
 HANDLE_DWARF_SECTION(DebugStrOffsets, ".debug_str_offsets", "debug-str-offsets")
 HANDLE_DWARF_SECTION(DebugCUIndex, ".debug_cu_index", "debug-cu-index")
 HANDLE_DWARF_SECTION(DebugTUIndex, ".debug_tu_index", "debug-tu-index")
 // Vendor extensions.
 HANDLE_DWARF_SECTION(AppleNames, ".apple_names", "apple-names")
 HANDLE_DWARF_SECTION(AppleTypes, ".apple_types", "apple-types")
 HANDLE_DWARF_SECTION(AppleNamespaces, ".apple_namespaces", "apple-namespaces")
 HANDLE_DWARF_SECTION(AppleObjC, ".apple_objc", "apple-objc")
 HANDLE_DWARF_SECTION(GdbIndex, ".gdb_index", "gdb-index")
 
+HANDLE_DW_IDX(0x01, compile_unit)
+HANDLE_DW_IDX(0x02, type_unit)
+HANDLE_DW_IDX(0x03, die_offset)
+HANDLE_DW_IDX(0x04, parent)
+HANDLE_DW_IDX(0x05, type_hash)
+
 
 #undef HANDLE_DW_TAG
 #undef HANDLE_DW_AT
 #undef HANDLE_DW_FORM
 #undef HANDLE_DW_OP
 #undef HANDLE_DW_LANG
 #undef HANDLE_DW_ATE
 #undef HANDLE_DW_VIRTUALITY
 #undef HANDLE_DW_DEFAULTED
 #undef HANDLE_DW_CC
 #undef HANDLE_DW_LNS
 #undef HANDLE_DW_LNE
 #undef HANDLE_DW_LNCT
 #undef HANDLE_DW_MACRO
 #undef HANDLE_DW_RLE
 #undef HANDLE_DW_CFA
 #undef HANDLE_DW_APPLE_PROPERTY
 #undef HANDLE_DW_UT
 #undef HANDLE_DWARF_SECTION
+#undef HANDLE_DW_IDX

llvm/trunk/lib/BinaryFormat/Dwarf.cpp

case DW_AT_ordering:
     return ArrayOrderString(Val);
   case DW_AT_discr_value:
     return DiscriminantString(Val);
   }
 
   return StringRef();
 }
 
+StringRef llvm::dwarf::IndexString(unsigned Idx) {
+  switch (Idx) {
+  default:
+    return StringRef();
+#define HANDLE_DW_IDX(ID, NAME)                                                \
+  case DW_IDX_##NAME:                                                          \
+    return "DW_IDX_" #NAME;
+#include "llvm/BinaryFormat/Dwarf.def"
+  }
+}
+
 bool llvm::dwarf::isValidFormForVersion(Form F, unsigned Version,
                                         bool ExtensionsOk) {
   if (FormVendor(F) == DWARF_VENDOR_DWARF) {
     unsigned FV = FormVersion(F);
     return FV > 0 && FV <= Version;
   }
   return ExtensionsOk;
 }
 
 uint32_t llvm::dwarf::djbHash(StringRef Buffer) {
   uint32_t H = 5381;
   for (char C : Buffer.bytes())
     H = ((H << 5) + H) + C;
   return H;
 }