[lld-macho] Add addition debug info

[oontvoo]

@int3: not sure how to write a good test for this ?

[int3]

This is for https://bugs.llvm.org/show_bug.cgi?id=49282 right? For testing you could create a file with an undefined symbol. See e.g. test/ELF/undef.s.

Btw, I think you didn't upload all your local changes, since DwarfObject::find doesn't exist in my local repo :)

[oontvoo]

updated diff to include the whole patch

[oontvoo]

In D99385#2651954, @int3 wrote:

This is for https://bugs.llvm.org/show_bug.cgi?id=49282 right? For testing you could create a file with an undefined symbol. See e.g. test/ELF/undef.s.

Yeah. Thanks

Btw, I think you didn't upload all your local changes, since DwarfObject::find doesn't exist in my local repo :)

Updated. Sorry about that!

[int3]

will do the rest of the review when the diff is ready :)

lld/MachO/Dwarf.cpp

65

apparently the convention (not my personal favorite) is to do nullchecks this way

69

I don't think the Mach-O format guarantees they're sorted

[oontvoo]

updated diff:

• stop excluding debug sessions from reloc-parsing (cos we need the info)
• added some test

pending issue: test didn't pass :-( ... it seems the reloc offset is wrong (and we coulnd't find it ...) Or I'm mis-interpretting it. Thoughts?

[int3]

hmm how is find() getting called?

[oontvoo]

rebase + addressed comments

[oontvoo]

Wait, I've messed up the rebase ...

[oontvoo]

move str literals into section_names

[thakis]

Just for my understanding: This loads more dwarf data into memory (so that we can use it for diags), but it doesn't write it to the output, right?

[oontvoo]

In D99385#2797035, @thakis wrote:

Just for my understanding: This loads more dwarf data into memory (so that we can use it for diags), but it doesn't write it to the output, right?

Yes - that's correct

[int3]

I don't see any tests, so I'm assuming that you're still iterating on this?

[int3]

clearing my queue

lld/MachO/Dwarf.h

 //===- DWARF.h -----------------------------------------------*- C++ -*-===//
 //
 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
 // See https://llvm.org/LICENSE.txt for license information.
 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===-------------------------------------------------------------------===//
 
 #ifndef LLD_MACHO_DWARF_H
 #define LLD_MACHO_DWARF_H
 
+#include "Relocations.h"
+
 #include "llvm/ADT/StringRef.h"
 #include "llvm/DebugInfo/DWARF/DWARFObject.h"
 
 namespace lld {
 namespace macho {
 
 class ObjFile;
 
+class MachODWARFSection final : public llvm::DWARFSection {
+public:
+  const InputSection *isec = nullptr;
+};
+
 // Implements the interface between LLVM's DWARF-parsing utilities and LLD's
 // InputSection structures.
 class DwarfObject final : public llvm::DWARFObject {
 public:
   bool isLittleEndian() const override { return true; }
 
   llvm::Optional<llvm::RelocAddrEntry> find(const llvm::DWARFSection &sec,
-                                            uint64_t pos) const override {
-    // TODO: implement this
-    return llvm::None;
-  }
+                                            uint64_t pos) const override;
 
   void forEachInfoSections(
       llvm::function_ref<void(const llvm::DWARFSection &)> f) const override {
     f(infoSection);
   }
 
+  const llvm::DWARFSection &getLineSection() const override {
+    return lineSection;
+  }
+
+  const llvm::DWARFSection &getAddrSection() const override {
+    return addrSection;
+  }
+
   llvm::StringRef getAbbrevSection() const override { return abbrevSection; }
+  llvm::StringRef getLineStrSection() const override { return lineStrSection; }
   llvm::StringRef getStrSection() const override { return strSection; }
 
   // Returns an instance of DwarfObject if the given object file has the
   // relevant DWARF debug sections.
   static std::unique_ptr<DwarfObject> create(ObjFile *);
 
 private:
-  llvm::DWARFSection infoSection;
+  MachODWARFSection addrSection;
+  MachODWARFSection infoSection;
+  MachODWARFSection lineSection;
+
   llvm::StringRef abbrevSection;
+  llvm::StringRef lineStrSection;
   llvm::StringRef strSection;
 };
 
 } // namespace macho
 } // namespace lld
 
 #endif

lld/MachO/Dwarf.cpp

 //===- DWARF.cpp ----------------------------------------------------------===//
 //
 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
 // See https://llvm.org/LICENSE.txt for license information.
 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
 #include "Dwarf.h"
 #include "InputFiles.h"
 #include "InputSection.h"
 #include "OutputSegment.h"
+#include "Symbols.h"
 
 #include <memory>
 
 using namespace lld;
 using namespace lld::macho;
 using namespace llvm;
 
 std::unique_ptr<DwarfObject> DwarfObject::create(ObjFile *obj) {
   auto dObj = std::make_unique<DwarfObject>();
   bool hasDwarfInfo = false;
   // LLD only needs to extract the source file path from the debug info, so we
   // initialize DwarfObject with just the sections necessary to get that path.
   // The debugger will locate the debug info via the object file paths that we
   // emit in our STABS symbols, so we don't need to process & emit them
   // ourselves.
   for (const InputSection *isec : obj->debugSections) {
     if (StringRef *s = StringSwitch<StringRef *>(isec->name)
-                           .Case("__debug_info", &dObj->infoSection.Data)
                            .Case("__debug_abbrev", &dObj->abbrevSection)
+                           .Case("__debug_line_str", &dObj->lineStrSection)
                            .Case("__debug_str", &dObj->strSection)
                            .Default(nullptr)) {
       *s = toStringRef(isec->data);
       hasDwarfInfo = true;
+      continue;
+    }
+
+    if (MachODWARFSection *m = StringSwitch<MachODWARFSection *>(isec->name)
+                                   .Case("__debug_addr", &dObj->addrSection)
+                                   .Case("__debug_info", &dObj->infoSection)
+                                   .Case("__debug_line", &dObj->lineSection)
+                                   .Default(nullptr)) {
+      m->Data = toStringRef(isec->data);
+      m->isec = isec;
+      hasDwarfInfo = true;
+      continue;
     }
   }
 
   if (hasDwarfInfo)
     return dObj;
   return nullptr;
 }
+
+static uint64_t resolver(uint64_t Type, uint64_t Offset, uint64_t S,
+                         uint64_t LocData, int64_t Addend) {
+  return S + Addend;
+}
+
+llvm::Optional<RelocAddrEntry> DwarfObject::find(const llvm::DWARFSection &sec,
+                                                 uint64_t pos) const {
+  auto &msec = static_cast<const MachODWARFSection &>(sec);
+  if (msec.isec == nullptr)
+    return llvm::None;
+
+  const Reloc *found = nullptr;
+  for (const auto &reloc : msec.isec->relocs) {
+    if (reloc.offset == pos) {
+      found = &reloc;
+      break;
+    }
+  }
+  if (!found)
+    return llvm::None;
+
+  const Symbol *sym = found->referent.dyn_cast<Symbol *>();
+  if (!sym)
+    return llvm::None;
+
+  uint32_t secIndex = sym->symtabIndex;
+  uint64_t val = 0;
+  if (const auto *def = dyn_cast<Defined>(sym)) {
+    val = def->value;
+  }
+
+  object::DataRefImpl d;
+  d.p = found->addend;
+
+  return RelocAddrEntry{secIndex, object::RelocationRef(d, nullptr),
+                        val,      llvm::Optional<object::RelocationRef>(),
+                        0,        resolver};
+}

lld/MachO/InputFiles.cpp

isec->data = {isZeroFill(sec.flags) ? nullptr : buf + sec.offset,
                   static_cast<size_t>(sec.size)};
     if (sec.align >= 32)
       error("alignment " + std::to_string(sec.align) + " of section " +
             isec->name + " is too large");
     else
       isec->align = 1 << sec.align;
     isec->flags = sec.flags;
 
-    if (!(isDebugSection(isec->flags) &&
-          isec->segname == segment_names::dwarf)) {
-      subsections.push_back({{0, isec}});
-    } else {
-      // Instead of emitting DWARF sections, we emit STABS symbols to the
-      // object files that contain them. We filter them out early to avoid
-      // parsing their relocations unnecessarily. But we must still push an
-      // empty map to ensure the indices line up for the remaining sections.
-      subsections.push_back({});
+    if (isDebugSection(isec->flags) && isec->segname == segment_names::dwarf) {
       debugSections.push_back(isec);
     }
   }
 }
 
 // Find the subsection corresponding to the greatest section offset that is <=
 // that of the given offset.
 //

lld/test/MachO/undef.s

+# REQUIRES: x86
+# RUN: rm -rf %t; split-file %s %t
+
+# RUN: llvm-mc -filetype=obj -triple=x86_64-apple-macos %t/test.s -o %t/test.o
+# RUN: llvm-mc -filetype=obj -triple=x86_64-apple-macos %t/undef-debug.s -o %t/undef-debug.o
+
+# RUN: llvm-ar rc %t/undef-debug.a %t/undef-debug.o
+# RUN: %lld %t/test.o %t/undef-debug.o  -o %t/out1.out
+
+#--- test.s
+  .section  __TEXT,__text,regular,pure_instructions
+  .build_version macos, 11, 0  sdk_version 11, 1
+  .globl  _main                   ## -- Begin function main
+  .p2align  4, 0x90
+_main:                                  ## @main
+Lfunc_begin0:
+.quad foo
+retq
+Lfunc_end0:
+                                        ## -- End function
+  .section  __DWARF,__debug_str,regular,debug
+Linfo_string:
+  .asciz  "Apple clang version 12.0.0 (clang-1200.0.32.29)" ## string offset=0
+  .asciz  "test.cc"               ## string offset=48
+  .asciz  "/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk" ## string offset=56
+  .asciz  "MacOSX.sdk"            ## string offset=108
+  .asciz  "/tmp"                  ## string offset=119
+  .asciz  "main"                  ## string offset=124
+  .asciz  "int"                   ## string offset=129
+  .section  __DWARF,__debug_abbrev,regular,debug
+Lsection_abbrev:
+  .byte 1                       ## Abbreviation Code
+  .byte 17                      ## DW_TAG_compile_unit
+  .byte 1                       ## DW_CHILDREN_yes
+  .byte 37                      ## DW_AT_producer
+  .byte 14                      ## DW_FORM_strp
+  .byte 19                      ## DW_AT_language
+  .byte 5                       ## DW_FORM_data2
+  .byte 3                       ## DW_AT_name
+  .byte 14                      ## DW_FORM_strp
+  .ascii  "\202|"                 ## DW_AT_LLVM_sysroot
+  .byte 14                      ## DW_FORM_strp
+  .ascii  "\357\177"              ## DW_AT_APPLE_sdk
+  .byte 14                      ## DW_FORM_strp
+  .byte 16                      ## DW_AT_stmt_list
+  .byte 23                      ## DW_FORM_sec_offset
+  .byte 27                      ## DW_AT_comp_dir
+  .byte 14                      ## DW_FORM_strp
+  .byte 17                      ## DW_AT_low_pc
+  .byte 1                       ## DW_FORM_addr
+  .byte 18                      ## DW_AT_high_pc
+  .byte 6                       ## DW_FORM_data4
+  .byte 0                       ## EOM(1)
+  .byte 0                       ## EOM(2)
+  .byte 2                       ## Abbreviation Code
+  .byte 46                      ## DW_TAG_subprogram
+  .byte 0                       ## DW_CHILDREN_no
+  .byte 17                      ## DW_AT_low_pc
+  .byte 1                       ## DW_FORM_addr
+  .byte 18                      ## DW_AT_high_pc
+  .byte 6                       ## DW_FORM_data4
+  .byte 64                      ## DW_AT_frame_base
+  .byte 24                      ## DW_FORM_exprloc
+  .byte 3                       ## DW_AT_name
+  .byte 14                      ## DW_FORM_strp
+  .byte 58                      ## DW_AT_decl_file
+  .byte 11                      ## DW_FORM_data1
+  .byte 59                      ## DW_AT_decl_line
+  .byte 11                      ## DW_FORM_data1
+  .byte 73                      ## DW_AT_type
+  .byte 19                      ## DW_FORM_ref4
+  .byte 63                      ## DW_AT_external
+  .byte 25                      ## DW_FORM_flag_present
+  .byte 0                       ## EOM(1)
+  .byte 0                       ## EOM(2)
+  .byte 3                       ## Abbreviation Code
+  .byte 36                      ## DW_TAG_base_type
+  .byte 0                       ## DW_CHILDREN_no
+  .byte 3                       ## DW_AT_name
+  .byte 14                      ## DW_FORM_strp
+  .byte 62                      ## DW_AT_encoding
+  .byte 11                      ## DW_FORM_data1
+  .byte 11                      ## DW_AT_byte_size
+  .byte 11                      ## DW_FORM_data1
+  .byte 0                       ## EOM(1)
+  .byte 0                       ## EOM(2)
+  .byte 0                       ## EOM(3)
+.section  __DWARF,__debug_info,regular,debug
+Lsection_info:
+Lcu_begin0:
+.set Lset0, Ldebug_info_end0-Ldebug_info_start0 ## Length of Unit
+  .long Lset0
+Ldebug_info_start0:
+  .short  4                       ## DWARF version number
+.set Lset1, Lsection_abbrev-Lsection_abbrev ## Offset Into Abbrev. Section
+  .long Lset1
+  .byte 8                       ## Address Size (in bytes)
+  .byte 1                       ## Abbrev [1] 0xb:0x48 DW_TAG_compile_unit
+  .long 0                       ## DW_AT_producer
+  .short  4                       ## DW_AT_language
+  .long 48                      ## DW_AT_name
+  .long 56                      ## DW_AT_LLVM_sysroot
+        .long 108                     ## DW_AT_APPLE_sdk
+        .long  __debug_line             ## DW_AT_stmt_list
+.set Lset2, Lline_table_start0-Lsection_line ## DW_AT_stmt_list
+  .long Lset2
+  .long 119                     ## DW_AT_comp_dir
+  .quad Lfunc_begin0            ## DW_AT_low_pc
+.set Lset3, Lfunc_end0-Lfunc_begin0     ## DW_AT_high_pc
+  .long Lset3
+  .byte 2                       ## Abbrev [2] 0x32:0x19 DW_TAG_subprogram
+  .quad Lfunc_begin0            ## DW_AT_low_pc
+.set Lset4, Lfunc_end0-Lfunc_begin0     ## DW_AT_high_pc
+  .long Lset4
+  .byte 1                       ## DW_AT_frame_base
+  .byte 86
+  .long 124                     ## DW_AT_name
+  .byte 1                       ## DW_AT_decl_file
+  .byte 3                       ## DW_AT_decl_line
+  .long 75                      ## DW_AT_type
+                                        ## DW_AT_external
+  .byte 3                       ## Abbrev [3] 0x4b:0x7 DW_TAG_base_type
+  .long 129                     ## DW_AT_name
+  .byte 5                       ## DW_AT_encoding
+  .byte 4                       ## DW_AT_byte_size
+  .byte 0                       ## End Of Children Mark
+Ldebug_info_end0:
+
+.section  __DWARF,__apple_names,regular,debug
+Lnames_begin:
+  .long 1212240712              ## Header Magic
+  .short  1                       ## Header Version
+  .short  0                       ## Header Hash Function
+  .long 1                       ## Header Bucket Count
+  .long 1                       ## Header Hash Count
+  .long 12                      ## Header Data Length
+  .long 0                       ## HeaderData Die Offset Base
+  .long 1                       ## HeaderData Atom Count
+  .short  1                       ## DW_ATOM_die_offset
+  .short  6                       ## DW_FORM_data4
+  .long 0                       ## Bucket 0
+  .long 2090499946              ## Hash in Bucket 0
+.set Lset5, LNames0-Lnames_begin        ## Offset in Bucket 0
+  .long Lset5
+LNames0:
+  .long 124                     ## main
+  .long 1                       ## Num DIEs
+  .long 50
+  .long 0
+  .section  __DWARF,__apple_objc,regular,debug
+Lobjc_begin:
+  .long 1212240712              ## Header Magic
+  .short  1                       ## Header Version
+  .short  0                       ## Header Hash Function
+  .long 1                       ## Header Bucket Count
+  .long 0                       ## Header Hash Count
+  .long 12                      ## Header Data Length
+  .long 0                       ## HeaderData Die Offset Base
+  .long 1                       ## HeaderData Atom Count
+  .short  1                       ## DW_ATOM_die_offset
+  .short  6                       ## DW_FORM_data4
+  .long -1                      ## Bucket 0
+  .section  __DWARF,__apple_namespac,regular,debug
+Lnamespac_begin:
+  .long 1212240712              ## Header Magic
+  .short  1                       ## Header Version
+  .short  0                       ## Header Hash Function
+  .long 1                       ## Header Bucket Count
+  .long 0                       ## Header Hash Count
+  .long 12                      ## Header Data Length
+  .long 0                       ## HeaderData Die Offset Base
+  .long 1                       ## HeaderData Atom Count
+  .short  1                       ## DW_ATOM_die_offset
+  .short  6                       ## DW_FORM_data4
+  .long -1                      ## Bucket 0
+  .section  __DWARF,__apple_types,regular,debug
+Ltypes_begin:
+  .long 1212240712              ## Header Magic
+  .short  1                       ## Header Version
+  .short  0                       ## Header Hash Function
+  .long 1                       ## Header Bucket Count
+  .long 1                       ## Header Hash Count
+  .long 20                      ## Header Data Length
+  .long 0                       ## HeaderData Die Offset Base
+  .long 3                       ## HeaderData Atom Count
+  .short  1                       ## DW_ATOM_die_offset
+  .short  6                       ## DW_FORM_data4
+  .short  3                       ## DW_ATOM_die_tag
+  .short  5                       ## DW_FORM_data2
+  .short  4                       ## DW_ATOM_type_flags
+  .short  11                      ## DW_FORM_data1
+  .long 0                       ## Bucket 0
+  .long 193495088               ## Hash in Bucket 0
+.set Lset6, Ltypes0-Ltypes_begin        ## Offset in Bucket 0
+  .long Lset6
+Ltypes0:
+  .long 129                     ## int
+  .long 1                       ## Num DIEs
+  .long 75
+  .short  36
+  .byte 0
+  .long 0
+.subsections_via_symbols
+  .section  __DWARF,__debug_line,regular,debug
+Lsection_line:
+Lline_table_start0:
+
+.section  __DWARF,__debug_aranges,regular,debug
+ltmp1:
+  .byte 0
+
+#--- undef-debug.s
+  .section  __TEXT,__text,regular,pure_instructions
+  .build_version macos, 11, 0  sdk_version 11, 1
+  .p2align  4, 0x90
+
+.text
+.globl _usertwo
+_usertwo:
+Lfunc_begin0:
+  .quad bar
+  ret
+Lfunc_end0:
+
+.section  __DWARF,__debug_str,regular,debug
+Linfo_string:
+  .asciz  "Apple clang version 12.0.0 (clang-1200.0.32.29)" ## string offset=0
+  .asciz  "undef-debug.s"               ## string offset=48
+  .asciz  "/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk" ## string offset=56
+  .asciz  "MacOSX.sdk"            ## string offset=108
+  .asciz  "/tmp"                  ## string offset=119
+  .asciz  "main"                  ## string offset=124
+  .asciz  "int"                   ## string offset=129
+  .section  __DWARF,__debug_abbrev,regular,debug
+Lsection_abbrev:
+  .byte 1                       ## Abbreviation Code
+  .byte 17                      ## DW_TAG_compile_unit
+  .byte 1                       ## DW_CHILDREN_yes
+  .byte 37                      ## DW_AT_producer
+  .byte 14                      ## DW_FORM_strp
+  .byte 19                      ## DW_AT_language
+  .byte 5                       ## DW_FORM_data2
+  .byte 3                       ## DW_AT_name
+  .byte 14                      ## DW_FORM_strp
+  .ascii  "\202|"                 ## DW_AT_LLVM_sysroot
+  .byte 14                      ## DW_FORM_strp
+  .ascii  "\357\177"              ## DW_AT_APPLE_sdk
+  .byte 14                      ## DW_FORM_strp
+  .byte 16                      ## DW_AT_stmt_list
+  .byte 23                      ## DW_FORM_sec_offset
+  .byte 27                      ## DW_AT_comp_dir
+  .byte 14                      ## DW_FORM_strp
+  .byte 17                      ## DW_AT_low_pc
+  .byte 1                       ## DW_FORM_addr
+  .byte 18                      ## DW_AT_high_pc
+  .byte 6                       ## DW_FORM_data4
+  .byte 0                       ## EOM(1)
+  .byte 0                       ## EOM(2)
+  .byte 2                       ## Abbreviation Code
+  .byte 46                      ## DW_TAG_subprogram
+  .byte 0                       ## DW_CHILDREN_no
+  .byte 17                      ## DW_AT_low_pc
+  .byte 1                       ## DW_FORM_addr
+  .byte 18                      ## DW_AT_high_pc
+  .byte 6                       ## DW_FORM_data4
+  .byte 64                      ## DW_AT_frame_base
+  .byte 24                      ## DW_FORM_exprloc
+  .byte 3                       ## DW_AT_name
+  .byte 14                      ## DW_FORM_strp
+  .byte 58                      ## DW_AT_decl_file
+  .byte 11                      ## DW_FORM_data1
+  .byte 59                      ## DW_AT_decl_line
+  .byte 11                      ## DW_FORM_data1
+  .byte 73                      ## DW_AT_type
+  .byte 19                      ## DW_FORM_ref4
+  .byte 63                      ## DW_AT_external
+  .byte 25                      ## DW_FORM_flag_present
+  .byte 0                       ## EOM(1)
+  .byte 0                       ## EOM(2)
+  .byte 3                       ## Abbreviation Code
+  .byte 36                      ## DW_TAG_base_type
+  .byte 0                       ## DW_CHILDREN_no
+  .byte 3                       ## DW_AT_name
+  .byte 14                      ## DW_FORM_strp
+  .byte 62                      ## DW_AT_encoding
+  .byte 11                      ## DW_FORM_data1
+  .byte 11                      ## DW_AT_byte_size
+  .byte 11                      ## DW_FORM_data1
+  .byte 0                       ## EOM(1)
+  .byte 0                       ## EOM(2)
+  .byte 0                       ## EOM(3)
+.section  __DWARF,__debug_info,regular,debug
+Lsection_info:
+Lcu_begin0:
+.set Lset0, Ldebug_info_end0-Ldebug_info_start0 ## Length of Unit
+  .long Lset0
+Ldebug_info_start0:
+  .short  4                       ## DWARF version number
+.set Lset1, Lsection_abbrev-Lsection_abbrev ## Offset Into Abbrev. Section
+  .long Lset1
+  .byte 8                       ## Address Size (in bytes)
+  .byte 1                       ## Abbrev [1] 0xb:0x48 DW_TAG_compile_unit
+  .long 0                       ## DW_AT_producer
+  .short  4                       ## DW_AT_language
+  .long 48                      ## DW_AT_name
+  .long 56                      ## DW_AT_LLVM_sysroot
+        .long 108                     ## DW_AT_APPLE_sdk
+        .long  __debug_line             ## DW_AT_stmt_list
+.set Lset2, Lline_table_start0-Lsection_line ## DW_AT_stmt_list
+  .long Lset2
+  .long 119                     ## DW_AT_comp_dir
+  .quad Lfunc_begin0            ## DW_AT_low_pc
+.set Lset3, Lfunc_end0-Lfunc_begin0     ## DW_AT_high_pc
+  .long Lset3
+  .byte 2                       ## Abbrev [2] 0x32:0x19 DW_TAG_subprogram
+  .quad Lfunc_begin0            ## DW_AT_low_pc
+.set Lset4, Lfunc_end0-Lfunc_begin0     ## DW_AT_high_pc
+  .long Lset4
+  .byte 1                       ## DW_AT_frame_base
+  .byte 86
+  .long 124                     ## DW_AT_name
+  .byte 1                       ## DW_AT_decl_file
+  .byte 3                       ## DW_AT_decl_line
+  .long 75                      ## DW_AT_type
+                                        ## DW_AT_external
+  .byte 3                       ## Abbrev [3] 0x4b:0x7 DW_TAG_base_type
+  .long 129                     ## DW_AT_name
+  .byte 5                       ## DW_AT_encoding
+  .byte 4                       ## DW_AT_byte_size
+  .byte 0                       ## End Of Children Mark
+Ldebug_info_end0:
+
+.section  __DWARF,__apple_names,regular,debug
+Lnames_begin:
+  .long 1212240712              ## Header Magic
+  .short  1                       ## Header Version
+  .short  0                       ## Header Hash Function
+  .long 1                       ## Header Bucket Count
+  .long 1                       ## Header Hash Count
+  .long 12                      ## Header Data Length
+  .long 0                       ## HeaderData Die Offset Base
+  .long 1                       ## HeaderData Atom Count
+  .short  1                       ## DW_ATOM_die_offset
+  .short  6                       ## DW_FORM_data4
+  .long 0                       ## Bucket 0
+  .long 2090499946              ## Hash in Bucket 0
+.set Lset5, LNames0-Lnames_begin        ## Offset in Bucket 0
+  .long Lset5
+LNames0:
+  .long 124                     ## main
+  .long 1                       ## Num DIEs
+  .long 50
+  .long 0
+  .section  __DWARF,__apple_objc,regular,debug
+Lobjc_begin:
+  .long 1212240712              ## Header Magic
+  .short  1                       ## Header Version
+  .short  0                       ## Header Hash Function
+  .long 1                       ## Header Bucket Count
+  .long 0                       ## Header Hash Count
+  .long 12                      ## Header Data Length
+  .long 0                       ## HeaderData Die Offset Base
+  .long 1                       ## HeaderData Atom Count
+  .short  1                       ## DW_ATOM_die_offset
+  .short  6                       ## DW_FORM_data4
+  .long -1                      ## Bucket 0
+  .section  __DWARF,__apple_namespac,regular,debug
+Lnamespac_begin:
+  .long 1212240712              ## Header Magic
+  .short  1                       ## Header Version
+  .short  0                       ## Header Hash Function
+  .long 1                       ## Header Bucket Count
+  .long 0                       ## Header Hash Count
+  .long 12                      ## Header Data Length
+  .long 0                       ## HeaderData Die Offset Base
+  .long 1                       ## HeaderData Atom Count
+  .short  1                       ## DW_ATOM_die_offset
+  .short  6                       ## DW_FORM_data4
+  .long -1                      ## Bucket 0
+  .section  __DWARF,__apple_types,regular,debug
+Ltypes_begin:
+  .long 1212240712              ## Header Magic
+  .short  1                       ## Header Version
+  .short  0                       ## Header Hash Function
+  .long 1                       ## Header Bucket Count
+  .long 1                       ## Header Hash Count
+  .long 20                      ## Header Data Length
+  .long 0                       ## HeaderData Die Offset Base
+  .long 3                       ## HeaderData Atom Count
+  .short  1                       ## DW_ATOM_die_offset
+  .short  6                       ## DW_FORM_data4
+  .short  3                       ## DW_ATOM_die_tag
+  .short  5                       ## DW_FORM_data2
+  .short  4                       ## DW_ATOM_type_flags
+  .short  11                      ## DW_FORM_data1
+  .long 0                       ## Bucket 0
+  .long 193495088               ## Hash in Bucket 0
+.set Lset6, Ltypes0-Ltypes_begin        ## Offset in Bucket 0
+  .long Lset6
+Ltypes0:
+  .long 129                     ## int
+  .long 1                       ## Num DIEs
+  .long 75
+  .short  36
+  .byte 0
+  .long 0
+.subsections_via_symbols
+  .section  __DWARF,__debug_line,regular,debug
+Lsection_line:
+Lline_table_start0:
+
+.section  __DWARF,__debug_aranges,regular,debug
+ltmp1:
+  .byte 0