[DWARFFormValue] Don't consider DW_FORM_data4/8 to be section offsets.

[JDevlieghere]

Summary

When dumping ToT clan's debug info with dwarfdump, we were seeing an error
saying that that the location list overflows the debug_loc section. After
reducing the testcase we figured out that we were interpreting the
DW_FORM_data4 as a section offset.

In DWARF3 DW_FORM_data4 and DW_FORM_data8 served also as a section offset.
Until now we didn't check check for the DWARF version, because some producers
(read old versions of clang) were still emitting this. The relevant
code/comment was added in 2013, and I believe it's now reasonable to start
checking the version.

The FormValue class is a little bit of a mess because it cashes the DWARF unit
and context when it extracted the value itself. Several methods of the class
rely on it being present, or return an Optional for the code path that needs
it. At the same time the FormValue class also used in places where there's no
DWARF unit.

For this patch I went with the least invasive change: checking the version from
the CU when it's available. Possible other (more correct?) alternatives are
storing the DWARF version in the FormValue class, or making it a required
argument to the isFormClass method. Neither are particularly attractive. Please
let me know what you think is best.

[aprantl]

llvm/test/tools/llvm-dwarfdump/X86/formclass2.s

14

--name g ?

382

Should we just drop the apple types section from the assembler input?

[aprantl]

llvm/lib/DebugInfo/DWARF/DWARFFormValue.cpp

200

"some producers" here means older versions of clang, but since older versions of clang also default to DWARF 2 (at least on Darwin) I think this is a safe change.

[aprantl]

llvm/lib/DebugInfo/DWARF/DWARFFormValue.cpp

200

To clarify: what we are dropping here is support for compilers that claim to emit DWARF 3+ but still is a FORM_data4 for a section offset. I'm fine with dropping support for these.

I'm not a fan of DWARFFormValue optionally having a DWARFUnit pointer. This is asking for trouble. If we could assert that we have on in this condition (or get rid of the optionality) I'd be much happier.

[dblaikie]

llvm/lib/DebugInfo/DWARF/DWARFFormValue.cpp

200

I mean... we could drop support for this convenience feature when dumping DWARFv3 and older entirely?

llvm/test/tools/llvm-dwarfdump/X86/formclass2.s

3–4

I'd consider making these both chars, just to make it clear that their type isn't interesting, perhaps.

6–9

I see this is necessary to produce a debug_loc section in the output. Perhaps that could be commented and/or maybe there's a more direct way to do it? (and/or maybe it'd be worth separating the need for a debug_loc section (& the code that tickles it sufficiently to occur) from the code that ensures 'e' is emitted in the DWARF)

Also - any idea why there's on an error emitted when debug_loc is present but too small? Should we emit an error even when it's not present? I mean, I can see the counterargument (could've stripped/objcopied this one section for test purposes, etc)

Also - 16384 seems rahter large. Any idea why the offset of 'g' must be /that/ large before the warning is emitted? oh... because it turns it into a data4, rather than a data2, etc. OK

[aprantl]

llvm/lib/DebugInfo/DWARF/DWARFFormValue.cpp

200

I mean... we could drop support for this convenience feature when dumping DWARFv3 and older entirely?

Probably not. This is generic libDebugInfo code so it's not a convenience feature, but necessary functionality. I ran across this bug in dsymutil, too, for example.

[dblaikie]

llvm/lib/DebugInfo/DWARF/DWARFFormValue.cpp

200

Ah, fair enough

[JDevlieghere]

Code review feedback.

[aprantl]

Is there a way to make the DWARF unit non-optional in this function?

[JDevlieghere]

In D58698#1419173, @aprantl wrote:

Is there a way to make the DWARF unit non-optional in this function?

Sorry, I landed this before seeing your comment. No, unfortunately it's not. The way the DWARFForm class works is that you can either initialize it yourself with a value (in which case there is no context or unit) or you can read it from data (in which case both are set). The only way to guarantee that we have a DWARF version in both scenarios would be to make it mandatory to pass a version number, which would become possible as the result of my recent refactoring.

[Esme]

Have you tested for DWARF3? It appears that you only added tests for DWARF2 and DWARF4.
And I noticed an error under DWARF3, where the C code source is the same as formclass4.s and formclass2.s.

0x0000004e: DW_TAG_member
              DW_AT_name	("g")
              DW_AT_type	(0x00000079 "short")
              DW_AT_decl_file	("a.cpp")
              DW_AT_decl_line	(3)
              DW_AT_data_member_location	(0x00010000: error: offset 0x10000 is beyond the end of data at 0x23
)

Should we drop the support of dumpLocationList for some scenarios of DWARF3?

llvm/lib/DebugInfo/DWARF/DWARFFormValue.cpp

bool DWARFFormValue::isFormClass(DWARFFormValue::FormClass FC) const {
   case DW_FORM_GNU_addr_index:
     return (FC == FC_Address);
   case DW_FORM_GNU_str_index:
   case DW_FORM_GNU_strp_alt:
     return (FC == FC_String);
   default:
     break;
   }
-  // In DWARF3 DW_FORM_data4 and DW_FORM_data8 served also as a section offset.
-  // Don't check for DWARF version here, as some producers may still do this
-  // by mistake. Also accept DW_FORM_[line_]strp since these are
-  // .debug_[line_]str section offsets.
-  return (Form == DW_FORM_data4 || Form == DW_FORM_data8 ||
-          Form == DW_FORM_strp || Form == DW_FORM_line_strp) &&
-         FC == FC_SectionOffset;
+
+  if (FC == FC_SectionOffset) {
+    if (Form == DW_FORM_strp || Form == DW_FORM_line_strp)
+      return true;
+    // In DWARF3 DW_FORM_data4 and DW_FORM_data8 served also as a section
+    // offset. If we don't have a DWARFUnit, default to the old behavior.
+    if (Form == DW_FORM_data4 || Form == DW_FORM_data8)
+      return !U || U->getVersion() <= 3;
+  }
+
+  return false;
 }
 
 bool DWARFFormValue::extractValue(const DWARFDataExtractor &Data,
                                   uint32_t *OffsetPtr, dwarf::FormParams FP,
                                   const DWARFContext *Ctx,
                                   const DWARFUnit *CU) {
   if (!Ctx && CU)
     Ctx = &CU->getContext();

llvm/test/tools/llvm-dwarfdump/X86/formclass2.s

+# Source:
+#   struct e {
+#     enum {} f[16384];
+#     short g;
+#   };
+#   e foo() {
+#     auto E = new e;
+#     return *E;
+#   }
+# Compile with:
+#   clang -O2 -gdwarf-2 -S a.cpp -o a2.s
+
+# RUN: llvm-mc %s -filetype obj -triple x86_64-apple-darwin -o %t.o
+# RUN: llvm-dwarfdump -debug-info %t.o | FileCheck %s
+
+# CHECK: DW_TAG_member
+# CHECK: DW_AT_name ("g")
+# CHECK: DW_AT_data_member_location (DW_OP_plus_uconst 0x10000)
+
+  .section  __TEXT,__text,regular,pure_instructions
+  .macosx_version_min 10, 14
+  .file 1 "/private/tmp" "a.cpp"
+  .globl  __Z3foov                ## -- Begin function _Z3foov
+  .p2align  4, 0x90
+__Z3foov:                               ## @_Z3foov
+Lfunc_begin0:
+  .loc  1 5 0                   ## a.cpp:5:0
+  .cfi_startproc
+## %bb.0:                               ## %entry
+  pushq %rbp
+  .cfi_def_cfa_offset 16
+  .cfi_offset %rbp, -16
+  movq  %rsp, %rbp
+  .cfi_def_cfa_register %rbp
+  pushq %rbx
+  pushq %rax
+  .cfi_offset %rbx, -24
+  movq  %rdi, %rbx
+Ltmp0:
+  .loc  1 6 12 prologue_end     ## a.cpp:6:12
+  movl  $65540, %edi            ## imm = 0x10004
+  callq __Znwm
+Ltmp1:
+  ##DEBUG_VALUE: foo:E <- $rax
+  .loc  1 7 10                  ## a.cpp:7:10
+  movl  $65540, %edx            ## imm = 0x10004
+  movq  %rbx, %rdi
+  movq  %rax, %rsi
+  callq _memcpy
+Ltmp2:
+  .loc  1 8 1                   ## a.cpp:8:1
+  movq  %rbx, %rax
+  addq  $8, %rsp
+  popq  %rbx
+  popq  %rbp
+  retq
+Ltmp3:
+Lfunc_end0:
+  .cfi_endproc
+                                        ## -- End function
+  .section  __DWARF,__debug_str,regular,debug
+Linfo_string:
+  .asciz  "clang version 9.0.0 ([e-mail]:llvm/llvm-project.git 752579736e76e0f322ba9ffa109326a93cd9237f)" ## string offset=0
+  .asciz  "a.cpp"                 ## string offset=100
+  .asciz  "/private/tmp"          ## string offset=106
+  .asciz  "e"                     ## string offset=119
+  .asciz  "f"                     ## string offset=121
+  .asciz  "__ARRAY_SIZE_TYPE__"   ## string offset=123
+  .asciz  "g"                     ## string offset=143
+  .asciz  "short"                 ## string offset=145
+  .asciz  "foo"                   ## string offset=151
+  .asciz  "_Z3foov"               ## string offset=155
+  .asciz  "E"                     ## string offset=163
+  .section  __DWARF,__debug_loc,regular,debug
+Lsection_debug_loc:
+Ldebug_loc0:
+.set Lset0, Ltmp1-Lfunc_begin0
+  .quad Lset0
+.set Lset1, Ltmp2-Lfunc_begin0
+  .quad Lset1
+  .short  1                       ## Loc expr size
+  .byte 80                      ## DW_OP_reg0
+  .quad 0
+  .quad 0
+  .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
+  .byte 16                      ## DW_AT_stmt_list
+  .byte 6                       ## DW_FORM_data4
+  .byte 27                      ## DW_AT_comp_dir
+  .byte 14                      ## DW_FORM_strp
+  .ascii  "\264B"                 ## DW_AT_GNU_pubnames
+  .byte 12                      ## DW_FORM_flag
+  .ascii  "\341\177"              ## DW_AT_APPLE_optimized
+  .byte 12                      ## DW_FORM_flag
+  .byte 17                      ## DW_AT_low_pc
+  .byte 1                       ## DW_FORM_addr
+  .byte 18                      ## DW_AT_high_pc
+  .byte 1                       ## DW_FORM_addr
+  .byte 0                       ## EOM(1)
+  .byte 0                       ## EOM(2)
+  .byte 2                       ## Abbreviation Code
+  .byte 19                      ## DW_TAG_structure_type
+  .byte 1                       ## DW_CHILDREN_yes
+  .byte 54                      ## DW_AT_calling_convention
+  .byte 11                      ## DW_FORM_data1
+  .byte 3                       ## DW_AT_name
+  .byte 14                      ## DW_FORM_strp
+  .byte 11                      ## DW_AT_byte_size
+  .byte 6                       ## DW_FORM_data4
+  .byte 58                      ## DW_AT_decl_file
+  .byte 11                      ## DW_FORM_data1
+  .byte 59                      ## DW_AT_decl_line
+  .byte 11                      ## DW_FORM_data1
+  .byte 0                       ## EOM(1)
+  .byte 0                       ## EOM(2)
+  .byte 3                       ## Abbreviation Code
+  .byte 13                      ## DW_TAG_member
+  .byte 0                       ## DW_CHILDREN_no
+  .byte 3                       ## DW_AT_name
+  .byte 14                      ## DW_FORM_strp
+  .byte 73                      ## DW_AT_type
+  .byte 19                      ## DW_FORM_ref4
+  .byte 58                      ## DW_AT_decl_file
+  .byte 11                      ## DW_FORM_data1
+  .byte 59                      ## DW_AT_decl_line
+  .byte 11                      ## DW_FORM_data1
+  .byte 56                      ## DW_AT_data_member_location
+  .byte 10                      ## DW_FORM_block1
+  .byte 0                       ## EOM(1)
+  .byte 0                       ## EOM(2)
+  .byte 4                       ## Abbreviation Code
+  .byte 4                       ## DW_TAG_enumeration_type
+  .byte 0                       ## DW_CHILDREN_no
+  .byte 11                      ## DW_AT_byte_size
+  .byte 11                      ## DW_FORM_data1
+  .byte 58                      ## DW_AT_decl_file
+  .byte 11                      ## DW_FORM_data1
+  .byte 59                      ## DW_AT_decl_line
+  .byte 11                      ## DW_FORM_data1
+  .byte 0                       ## EOM(1)
+  .byte 0                       ## EOM(2)
+  .byte 5                       ## Abbreviation Code
+  .byte 1                       ## DW_TAG_array_type
+  .byte 1                       ## DW_CHILDREN_yes
+  .byte 73                      ## DW_AT_type
+  .byte 19                      ## DW_FORM_ref4
+  .byte 0                       ## EOM(1)
+  .byte 0                       ## EOM(2)
+  .byte 6                       ## Abbreviation Code
+  .byte 33                      ## DW_TAG_subrange_type
+  .byte 0                       ## DW_CHILDREN_no
+  .byte 73                      ## DW_AT_type
+  .byte 19                      ## DW_FORM_ref4
+  .byte 55                      ## DW_AT_count
+  .byte 5                       ## DW_FORM_data2
+  .byte 0                       ## EOM(1)
+  .byte 0                       ## EOM(2)
+  .byte 7                       ## Abbreviation Code
+  .byte 36                      ## DW_TAG_base_type
+  .byte 0                       ## DW_CHILDREN_no
+  .byte 3                       ## DW_AT_name
+  .byte 14                      ## DW_FORM_strp
+  .byte 11                      ## DW_AT_byte_size
+  .byte 11                      ## DW_FORM_data1
+  .byte 62                      ## DW_AT_encoding
+  .byte 11                      ## DW_FORM_data1
+  .byte 0                       ## EOM(1)
+  .byte 0                       ## EOM(2)
+  .byte 8                       ## 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 9                       ## Abbreviation Code
+  .byte 46                      ## DW_TAG_subprogram
+  .byte 1                       ## DW_CHILDREN_yes
+  .byte 17                      ## DW_AT_low_pc
+  .byte 1                       ## DW_FORM_addr
+  .byte 18                      ## DW_AT_high_pc
+  .byte 1                       ## DW_FORM_addr
+  .byte 64                      ## DW_AT_frame_base
+  .byte 10                      ## DW_FORM_block1
+  .ascii  "\207@"                 ## DW_AT_MIPS_linkage_name
+  .byte 14                      ## DW_FORM_strp
+  .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 12                      ## DW_FORM_flag
+  .ascii  "\341\177"              ## DW_AT_APPLE_optimized
+  .byte 12                      ## DW_FORM_flag
+  .byte 0                       ## EOM(1)
+  .byte 0                       ## EOM(2)
+  .byte 10                      ## Abbreviation Code
+  .byte 52                      ## DW_TAG_variable
+  .byte 0                       ## DW_CHILDREN_no
+  .byte 2                       ## DW_AT_location
+  .byte 6                       ## DW_FORM_data4
+  .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 0                       ## EOM(1)
+  .byte 0                       ## EOM(2)
+  .byte 11                      ## Abbreviation Code
+  .byte 15                      ## DW_TAG_pointer_type
+  .byte 0                       ## DW_CHILDREN_no
+  .byte 73                      ## DW_AT_type
+  .byte 19                      ## DW_FORM_ref4
+  .byte 0                       ## EOM(1)
+  .byte 0                       ## EOM(2)
+  .byte 0                       ## EOM(3)
+  .section  __DWARF,__debug_info,regular,debug
+Lsection_info:
+Lcu_begin0:
+.set Lset2, Ldebug_info_end0-Ldebug_info_start0 ## Length of Unit
+  .long Lset2
+Ldebug_info_start0:
+  .short  2                       ## DWARF version number
+.set Lset3, Lsection_abbrev-Lsection_abbrev ## Offset Into Abbrev. Section
+  .long Lset3
+  .byte 8                       ## Address Size (in bytes)
+  .byte 1                       ## Abbrev [1] 0xb:0xa8 DW_TAG_compile_unit
+  .long 0                       ## DW_AT_producer
+  .short  4                       ## DW_AT_language
+  .long 100                     ## DW_AT_name
+.set Lset4, Lline_table_start0-Lsection_line ## DW_AT_stmt_list
+  .long Lset4
+  .long 106                     ## DW_AT_comp_dir
+  .byte 1                       ## DW_AT_GNU_pubnames
+  .byte 1                       ## DW_AT_APPLE_optimized
+  .quad Lfunc_begin0            ## DW_AT_low_pc
+  .quad Lfunc_end0              ## DW_AT_high_pc
+  .byte 2                       ## Abbrev [2] 0x30:0x2f DW_TAG_structure_type
+  .byte 5                       ## DW_AT_calling_convention
+  .long 119                     ## DW_AT_name
+  .long 65540                   ## DW_AT_byte_size
+  .byte 1                       ## DW_AT_decl_file
+  .byte 1                       ## DW_AT_decl_line
+  .byte 3                       ## Abbrev [3] 0x3c:0xe DW_TAG_member
+  .long 121                     ## DW_AT_name
+  .long 95                      ## DW_AT_type
+  .byte 1                       ## DW_AT_decl_file
+  .byte 2                       ## DW_AT_decl_line
+  .byte 2                       ## DW_AT_data_member_location
+  .byte 35
+  .byte 0
+  .byte 4                       ## Abbrev [4] 0x4a:0x4 DW_TAG_enumeration_type
+  .byte 4                       ## DW_AT_byte_size
+  .byte 1                       ## DW_AT_decl_file
+  .byte 2                       ## DW_AT_decl_line
+  .byte 3                       ## Abbrev [3] 0x4e:0x10 DW_TAG_member
+  .long 143                     ## DW_AT_name
+  .long 115                     ## DW_AT_type
+  .byte 1                       ## DW_AT_decl_file
+  .byte 3                       ## DW_AT_decl_line
+  .byte 4                       ## DW_AT_data_member_location
+  .byte 35
+  .ascii  "\200\200\004"
+  .byte 0                       ## End Of Children Mark
+  .byte 5                       ## Abbrev [5] 0x5f:0xd DW_TAG_array_type
+  .long 74                      ## DW_AT_type
+  .byte 6                       ## Abbrev [6] 0x64:0x7 DW_TAG_subrange_type
+  .long 108                     ## DW_AT_type
+  .short  16384                   ## DW_AT_count
+  .byte 0                       ## End Of Children Mark
+  .byte 7                       ## Abbrev [7] 0x6c:0x7 DW_TAG_base_type
+  .long 123                     ## DW_AT_name
+  .byte 8                       ## DW_AT_byte_size
+  .byte 7                       ## DW_AT_encoding
+  .byte 8                       ## Abbrev [8] 0x73:0x7 DW_TAG_base_type
+  .long 145                     ## DW_AT_name
+  .byte 5                       ## DW_AT_encoding
+  .byte 2                       ## DW_AT_byte_size
+  .byte 9                       ## Abbrev [9] 0x7a:0x33 DW_TAG_subprogram
+  .quad Lfunc_begin0            ## DW_AT_low_pc
+  .quad Lfunc_end0              ## DW_AT_high_pc
+  .byte 1                       ## DW_AT_frame_base
+  .byte 86
+  .long 155                     ## DW_AT_MIPS_linkage_name
+  .long 151                     ## DW_AT_name
+  .byte 1                       ## DW_AT_decl_file
+  .byte 5                       ## DW_AT_decl_line
+  .long 48                      ## DW_AT_type
+  .byte 1                       ## DW_AT_external
+  .byte 1                       ## DW_AT_APPLE_optimized
+  .byte 10                      ## Abbrev [10] 0x9d:0xf DW_TAG_variable
+.set Lset5, Ldebug_loc0-Lsection_debug_loc ## DW_AT_location
+  .long Lset5
+  .long 163                     ## DW_AT_name
+  .byte 1                       ## DW_AT_decl_file
+  .byte 6                       ## DW_AT_decl_line
+  .long 173                     ## DW_AT_type
+  .byte 0                       ## End Of Children Mark
+  .byte 11                      ## Abbrev [11] 0xad:0x5 DW_TAG_pointer_type
+  .long 48                      ## DW_AT_type
+  .byte 0                       ## End Of Children Mark
+Ldebug_info_end0:
+  .section  __DWARF,__debug_macinfo,regular,debug
+Ldebug_macinfo:
+  .byte 0                       ## End Of Macro List Mark
+  .section  __DWARF,__apple_names,regular,debug
+Lnames_begin:
+  .long 1212240712              ## Header Magic
+  .short  1                       ## Header Version
+  .short  0                       ## Header Hash Function
+  .long 2                       ## Header Bucket Count
+  .long 2                       ## 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
+  .long 0                       ## Bucket 1
+  .long 193491849               ## Hash in Bucket 1
+  .long 1784752363              ## Hash in Bucket 1
+.set Lset6, LNames0-Lnames_begin        ## Offset in Bucket 1
+  .long Lset6
+.set Lset7, LNames1-Lnames_begin        ## Offset in Bucket 1
+  .long Lset7
+LNames0:
+  .long 151                     ## foo
+  .long 1                       ## Num DIEs
+  .long 122
+  .long 0
+LNames1:
+  .long 155                     ## _Z3foov
+  .long 1                       ## Num DIEs
+  .long 122
+  .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 3                       ## Header Bucket Count
+  .long 3                       ## 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 -1                      ## Bucket 0
+  .long 0                       ## Bucket 1
+  .long 1                       ## Bucket 2
+  .long 274395349               ## Hash in Bucket 1
+  .long 177674                  ## Hash in Bucket 2
+  .long -594775205              ## Hash in Bucket 2
+.set Lset8, Ltypes0-Ltypes_begin        ## Offset in Bucket 1
+  .long Lset8
+.set Lset9, Ltypes1-Ltypes_begin        ## Offset in Bucket 2
+  .long Lset9
+.set Lset10, Ltypes2-Ltypes_begin       ## Offset in Bucket 2
+  .long Lset10
+Ltypes0:
+  .long 145                     ## short
+  .long 1                       ## Num DIEs
+  .long 115
+  .short  36
+  .byte 0
+  .long 0
+Ltypes1:
+  .long 119                     ## e
+  .long 1                       ## Num DIEs
+  .long 48
+  .short  19
+  .byte 0
+  .long 0
+Ltypes2:
+  .long 123                     ## __ARRAY_SIZE_TYPE__
+  .long 1                       ## Num DIEs
+  .long 108
+  .short  36
+  .byte 0
+  .long 0
+  .section  __DWARF,__debug_gnu_pubn,regular,debug
+.set Lset11, LpubNames_end0-LpubNames_begin0 ## Length of Public Names Info
+  .long Lset11
+LpubNames_begin0:
+  .short  2                       ## DWARF Version
+.set Lset12, Lcu_begin0-Lsection_info   ## Offset of Compilation Unit Info
+  .long Lset12
+  .long 179                     ## Compilation Unit Length
+  .long 122                     ## DIE offset
+  .byte 48                      ## Attributes: FUNCTION, EXTERNAL
+  .asciz  "foo"                   ## External Name
+  .long 0                       ## End Mark
+LpubNames_end0:
+  .section  __DWARF,__debug_gnu_pubt,regular,debug
+.set Lset13, LpubTypes_end0-LpubTypes_begin0 ## Length of Public Types Info
+  .long Lset13
+LpubTypes_begin0:
+  .short  2                       ## DWARF Version
+.set Lset14, Lcu_begin0-Lsection_info   ## Offset of Compilation Unit Info
+  .long Lset14
+  .long 179                     ## Compilation Unit Length
+  .long 115                     ## DIE offset
+  .byte 144                     ## Attributes: TYPE, STATIC
+  .asciz  "short"                 ## External Name
+  .long 48                      ## DIE offset
+  .byte 16                      ## Attributes: TYPE, EXTERNAL
+  .asciz  "e"                     ## External Name
+  .long 0                       ## End Mark
+LpubTypes_end0:
+
+.subsections_via_symbols
+  .section  __DWARF,__debug_line,regular,debug
+Lsection_line:
+Lline_table_start0:

llvm/test/tools/llvm-dwarfdump/X86/formclass4.s

+# Source:
+#   struct e {
+#     enum {} f[16384];
+#     short g;
+#   };
+#   e foo() {
+#     auto E = new e;
+#     return *E;
+#   }
+# Compile with:
+#   clang -O2 -gdwarf-4 -S a.cpp -o a4.s
+
+# RUN: llvm-mc %s -filetype obj -triple x86_64-apple-darwin -o %t.o
+# RUN: llvm-dwarfdump -debug-info %t.o | FileCheck %s
+
+# CHECK: DW_TAG_member
+# CHECK: DW_AT_name ("g")
+# CHECK: DW_AT_data_member_location    (0x00010000)
+
+  .section  __TEXT,__text,regular,pure_instructions
+  .macosx_version_min 10, 14
+  .file 1 "/private/tmp" "a.cpp"
+  .globl  __Z3foov                ## -- Begin function _Z3foov
+  .p2align  4, 0x90
+__Z3foov:                               ## @_Z3foov
+Lfunc_begin0:
+  .loc  1 5 0                   ## a.cpp:5:0
+  .cfi_startproc
+## %bb.0:                               ## %entry
+  pushq %rbp
+  .cfi_def_cfa_offset 16
+  .cfi_offset %rbp, -16
+  movq  %rsp, %rbp
+  .cfi_def_cfa_register %rbp
+  pushq %rbx
+  pushq %rax
+  .cfi_offset %rbx, -24
+  movq  %rdi, %rbx
+Ltmp0:
+  .loc  1 6 12 prologue_end     ## a.cpp:6:12
+  movl  $65540, %edi            ## imm = 0x10004
+  callq __Znwm
+Ltmp1:
+  ##DEBUG_VALUE: foo:E <- $rax
+  .loc  1 7 10                  ## a.cpp:7:10
+  movl  $65540, %edx            ## imm = 0x10004
+  movq  %rbx, %rdi
+  movq  %rax, %rsi
+  callq _memcpy
+Ltmp2:
+  .loc  1 8 1                   ## a.cpp:8:1
+  movq  %rbx, %rax
+  addq  $8, %rsp
+  popq  %rbx
+  popq  %rbp
+  retq
+Ltmp3:
+Lfunc_end0:
+  .cfi_endproc
+                                        ## -- End function
+  .section  __DWARF,__debug_str,regular,debug
+Linfo_string:
+  .asciz  "clang version 9.0.0 ([e-mail]:llvm/llvm-project.git 752579736e76e0f322ba9ffa109326a93cd9237f)" ## string offset=0
+  .asciz  "a.cpp"                 ## string offset=100
+  .asciz  "/private/tmp"          ## string offset=106
+  .asciz  "e"                     ## string offset=119
+  .asciz  "f"                     ## string offset=121
+  .asciz  "unsigned int"          ## string offset=123
+  .asciz  "__ARRAY_SIZE_TYPE__"   ## string offset=136
+  .asciz  "g"                     ## string offset=156
+  .asciz  "short"                 ## string offset=158
+  .asciz  "foo"                   ## string offset=164
+  .asciz  "_Z3foov"               ## string offset=168
+  .asciz  "E"                     ## string offset=176
+  .section  __DWARF,__debug_loc,regular,debug
+Lsection_debug_loc:
+Ldebug_loc0:
+.set Lset0, Ltmp1-Lfunc_begin0
+  .quad Lset0
+.set Lset1, Ltmp2-Lfunc_begin0
+  .quad Lset1
+  .short  1                       ## Loc expr size
+  .byte 80                      ## DW_OP_reg0
+  .quad 0
+  .quad 0
+  .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
+  .byte 16                      ## DW_AT_stmt_list
+  .byte 23                      ## DW_FORM_sec_offset
+  .byte 27                      ## DW_AT_comp_dir
+  .byte 14                      ## DW_FORM_strp
+  .ascii  "\264B"                 ## DW_AT_GNU_pubnames
+  .byte 25                      ## DW_FORM_flag_present
+  .ascii  "\341\177"              ## DW_AT_APPLE_optimized
+  .byte 25                      ## DW_FORM_flag_present
+  .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 19                      ## DW_TAG_structure_type
+  .byte 1                       ## DW_CHILDREN_yes
+  .byte 54                      ## DW_AT_calling_convention
+  .byte 11                      ## DW_FORM_data1
+  .byte 3                       ## DW_AT_name
+  .byte 14                      ## DW_FORM_strp
+  .byte 11                      ## DW_AT_byte_size
+  .byte 6                       ## DW_FORM_data4
+  .byte 58                      ## DW_AT_decl_file
+  .byte 11                      ## DW_FORM_data1
+  .byte 59                      ## DW_AT_decl_line
+  .byte 11                      ## DW_FORM_data1
+  .byte 0                       ## EOM(1)
+  .byte 0                       ## EOM(2)
+  .byte 3                       ## Abbreviation Code
+  .byte 13                      ## DW_TAG_member
+  .byte 0                       ## DW_CHILDREN_no
+  .byte 3                       ## DW_AT_name
+  .byte 14                      ## DW_FORM_strp
+  .byte 73                      ## DW_AT_type
+  .byte 19                      ## DW_FORM_ref4
+  .byte 58                      ## DW_AT_decl_file
+  .byte 11                      ## DW_FORM_data1
+  .byte 59                      ## DW_AT_decl_line
+  .byte 11                      ## DW_FORM_data1
+  .byte 56                      ## DW_AT_data_member_location
+  .byte 11                      ## DW_FORM_data1
+  .byte 0                       ## EOM(1)
+  .byte 0                       ## EOM(2)
+  .byte 4                       ## Abbreviation Code
+  .byte 4                       ## DW_TAG_enumeration_type
+  .byte 0                       ## DW_CHILDREN_no
+  .byte 73                      ## DW_AT_type
+  .byte 19                      ## DW_FORM_ref4
+  .byte 11                      ## DW_AT_byte_size
+  .byte 11                      ## DW_FORM_data1
+  .byte 58                      ## DW_AT_decl_file
+  .byte 11                      ## DW_FORM_data1
+  .byte 59                      ## DW_AT_decl_line
+  .byte 11                      ## DW_FORM_data1
+  .byte 0                       ## EOM(1)
+  .byte 0                       ## EOM(2)
+  .byte 5                       ## Abbreviation Code
+  .byte 13                      ## DW_TAG_member
+  .byte 0                       ## DW_CHILDREN_no
+  .byte 3                       ## DW_AT_name
+  .byte 14                      ## DW_FORM_strp
+  .byte 73                      ## DW_AT_type
+  .byte 19                      ## DW_FORM_ref4
+  .byte 58                      ## DW_AT_decl_file
+  .byte 11                      ## DW_FORM_data1
+  .byte 59                      ## DW_AT_decl_line
+  .byte 11                      ## DW_FORM_data1
+  .byte 56                      ## DW_AT_data_member_location
+  .byte 6                       ## DW_FORM_data4
+  .byte 0                       ## EOM(1)
+  .byte 0                       ## EOM(2)
+  .byte 6                       ## Abbreviation Code
+  .byte 1                       ## DW_TAG_array_type
+  .byte 1                       ## DW_CHILDREN_yes
+  .byte 73                      ## DW_AT_type
+  .byte 19                      ## DW_FORM_ref4
+  .byte 0                       ## EOM(1)
+  .byte 0                       ## EOM(2)
+  .byte 7                       ## Abbreviation Code
+  .byte 33                      ## DW_TAG_subrange_type
+  .byte 0                       ## DW_CHILDREN_no
+  .byte 73                      ## DW_AT_type
+  .byte 19                      ## DW_FORM_ref4
+  .byte 55                      ## DW_AT_count
+  .byte 5                       ## DW_FORM_data2
+  .byte 0                       ## EOM(1)
+  .byte 0                       ## EOM(2)
+  .byte 8                       ## 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 9                       ## Abbreviation Code
+  .byte 36                      ## DW_TAG_base_type
+  .byte 0                       ## DW_CHILDREN_no
+  .byte 3                       ## DW_AT_name
+  .byte 14                      ## DW_FORM_strp
+  .byte 11                      ## DW_AT_byte_size
+  .byte 11                      ## DW_FORM_data1
+  .byte 62                      ## DW_AT_encoding
+  .byte 11                      ## DW_FORM_data1
+  .byte 0                       ## EOM(1)
+  .byte 0                       ## EOM(2)
+  .byte 10                      ## Abbreviation Code
+  .byte 46                      ## DW_TAG_subprogram
+  .byte 1                       ## DW_CHILDREN_yes
+  .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 122                     ## DW_AT_call_all_calls
+  .byte 25                      ## DW_FORM_flag_present
+  .byte 110                     ## DW_AT_linkage_name
+  .byte 14                      ## DW_FORM_strp
+  .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
+  .ascii  "\341\177"              ## DW_AT_APPLE_optimized
+  .byte 25                      ## DW_FORM_flag_present
+  .byte 0                       ## EOM(1)
+  .byte 0                       ## EOM(2)
+  .byte 11                      ## Abbreviation Code
+  .byte 52                      ## DW_TAG_variable
+  .byte 0                       ## DW_CHILDREN_no
+  .byte 2                       ## DW_AT_location
+  .byte 23                      ## DW_FORM_sec_offset
+  .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 0                       ## EOM(1)
+  .byte 0                       ## EOM(2)
+  .byte 12                      ## Abbreviation Code
+  .byte 15                      ## DW_TAG_pointer_type
+  .byte 0                       ## DW_CHILDREN_no
+  .byte 73                      ## DW_AT_type
+  .byte 19                      ## DW_FORM_ref4
+  .byte 0                       ## EOM(1)
+  .byte 0                       ## EOM(2)
+  .byte 0                       ## EOM(3)
+  .section  __DWARF,__debug_info,regular,debug
+Lsection_info:
+Lcu_begin0:
+.set Lset2, Ldebug_info_end0-Ldebug_info_start0 ## Length of Unit
+  .long Lset2
+Ldebug_info_start0:
+  .short  4                       ## DWARF version number
+.set Lset3, Lsection_abbrev-Lsection_abbrev ## Offset Into Abbrev. Section
+  .long Lset3
+  .byte 8                       ## Address Size (in bytes)
+  .byte 1                       ## Abbrev [1] 0xb:0xa4 DW_TAG_compile_unit
+  .long 0                       ## DW_AT_producer
+  .short  4                       ## DW_AT_language
+  .long 100                     ## DW_AT_name
+.set Lset4, Lline_table_start0-Lsection_line ## DW_AT_stmt_list
+  .long Lset4
+  .long 106                     ## DW_AT_comp_dir
+                                        ## DW_AT_GNU_pubnames
+                                        ## DW_AT_APPLE_optimized
+  .quad Lfunc_begin0            ## DW_AT_low_pc
+.set Lset5, Lfunc_end0-Lfunc_begin0     ## DW_AT_high_pc
+  .long Lset5
+  .byte 2                       ## Abbrev [2] 0x2a:0x30 DW_TAG_structure_type
+  .byte 5                       ## DW_AT_calling_convention
+  .long 119                     ## DW_AT_name
+  .long 65540                   ## DW_AT_byte_size
+  .byte 1                       ## DW_AT_decl_file
+  .byte 1                       ## DW_AT_decl_line
+  .byte 3                       ## Abbrev [3] 0x36:0xc DW_TAG_member
+  .long 121                     ## DW_AT_name
+  .long 90                      ## DW_AT_type
+  .byte 1                       ## DW_AT_decl_file
+  .byte 2                       ## DW_AT_decl_line
+  .byte 0                       ## DW_AT_data_member_location
+  .byte 4                       ## Abbrev [4] 0x42:0x8 DW_TAG_enumeration_type
+  .long 103                     ## DW_AT_type
+  .byte 4                       ## DW_AT_byte_size
+  .byte 1                       ## DW_AT_decl_file
+  .byte 2                       ## DW_AT_decl_line
+  .byte 5                       ## Abbrev [5] 0x4a:0xf DW_TAG_member
+  .long 156                     ## DW_AT_name
+  .long 117                     ## DW_AT_type
+  .byte 1                       ## DW_AT_decl_file
+  .byte 3                       ## DW_AT_decl_line
+  .long 65536                   ## DW_AT_data_member_location
+  .byte 0                       ## End Of Children Mark
+  .byte 6                       ## Abbrev [6] 0x5a:0xd DW_TAG_array_type
+  .long 66                      ## DW_AT_type
+  .byte 7                       ## Abbrev [7] 0x5f:0x7 DW_TAG_subrange_type
+  .long 110                     ## DW_AT_type
+  .short  16384                   ## DW_AT_count
+  .byte 0                       ## End Of Children Mark
+  .byte 8                       ## Abbrev [8] 0x67:0x7 DW_TAG_base_type
+  .long 123                     ## DW_AT_name
+  .byte 7                       ## DW_AT_encoding
+  .byte 4                       ## DW_AT_byte_size
+  .byte 9                       ## Abbrev [9] 0x6e:0x7 DW_TAG_base_type
+  .long 136                     ## DW_AT_name
+  .byte 8                       ## DW_AT_byte_size
+  .byte 7                       ## DW_AT_encoding
+  .byte 8                       ## Abbrev [8] 0x75:0x7 DW_TAG_base_type
+  .long 158                     ## DW_AT_name
+  .byte 5                       ## DW_AT_encoding
+  .byte 2                       ## DW_AT_byte_size
+  .byte 10                      ## Abbrev [10] 0x7c:0x2d DW_TAG_subprogram
+  .quad Lfunc_begin0            ## DW_AT_low_pc
+.set Lset6, Lfunc_end0-Lfunc_begin0     ## DW_AT_high_pc
+  .long Lset6
+  .byte 1                       ## DW_AT_frame_base
+  .byte 86
+                                        ## DW_AT_call_all_calls
+  .long 168                     ## DW_AT_linkage_name
+  .long 164                     ## DW_AT_name
+  .byte 1                       ## DW_AT_decl_file
+  .byte 5                       ## DW_AT_decl_line
+  .long 42                      ## DW_AT_type
+                                        ## DW_AT_external
+                                        ## DW_AT_APPLE_optimized
+  .byte 11                      ## Abbrev [11] 0x99:0xf DW_TAG_variable
+.set Lset7, Ldebug_loc0-Lsection_debug_loc ## DW_AT_location
+  .long Lset7
+  .long 176                     ## DW_AT_name
+  .byte 1                       ## DW_AT_decl_file
+  .byte 6                       ## DW_AT_decl_line
+  .long 169                     ## DW_AT_type
+  .byte 0                       ## End Of Children Mark
+  .byte 12                      ## Abbrev [12] 0xa9:0x5 DW_TAG_pointer_type
+  .long 42                      ## DW_AT_type
+  .byte 0                       ## End Of Children Mark
+Ldebug_info_end0:
+  .section  __DWARF,__debug_macinfo,regular,debug
+Ldebug_macinfo:
+  .byte 0                       ## End Of Macro List Mark
+  .section  __DWARF,__apple_names,regular,debug
+Lnames_begin:
+  .long 1212240712              ## Header Magic
+  .short  1                       ## Header Version
+  .short  0                       ## Header Hash Function
+  .long 2                       ## Header Bucket Count
+  .long 2                       ## 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
+  .long 0                       ## Bucket 1
+  .long 193491849               ## Hash in Bucket 1
+  .long 1784752363              ## Hash in Bucket 1
+.set Lset8, LNames0-Lnames_begin        ## Offset in Bucket 1
+  .long Lset8
+.set Lset9, LNames1-Lnames_begin        ## Offset in Bucket 1
+  .long Lset9
+LNames0:
+  .long 164                     ## foo
+  .long 1                       ## Num DIEs
+  .long 124
+  .long 0
+LNames1:
+  .long 168                     ## _Z3foov
+  .long 1                       ## Num DIEs
+  .long 124
+  .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 4                       ## Header Bucket Count
+  .long 4                       ## 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 -1                      ## Bucket 0
+  .long 0                       ## Bucket 1
+  .long 2                       ## Bucket 2
+  .long 3                       ## Bucket 3
+  .long 274395349               ## Hash in Bucket 1
+  .long -1304652851             ## Hash in Bucket 1
+  .long 177674                  ## Hash in Bucket 2
+  .long -594775205              ## Hash in Bucket 3
+.set Lset10, Ltypes0-Ltypes_begin       ## Offset in Bucket 1
+  .long Lset10
+.set Lset11, Ltypes3-Ltypes_begin       ## Offset in Bucket 1
+  .long Lset11
+.set Lset12, Ltypes1-Ltypes_begin       ## Offset in Bucket 2
+  .long Lset12
+.set Lset13, Ltypes2-Ltypes_begin       ## Offset in Bucket 3
+  .long Lset13
+Ltypes0:
+  .long 158                     ## short
+  .long 1                       ## Num DIEs
+  .long 117
+  .short  36
+  .byte 0
+  .long 0
+Ltypes3:
+  .long 123                     ## unsigned int
+  .long 1                       ## Num DIEs
+  .long 103
+  .short  36
+  .byte 0
+  .long 0
+Ltypes1:
+  .long 119                     ## e
+  .long 1                       ## Num DIEs
+  .long 42
+  .short  19
+  .byte 0
+  .long 0
+Ltypes2:
+  .long 136                     ## __ARRAY_SIZE_TYPE__
+  .long 1                       ## Num DIEs
+  .long 110
+  .short  36
+  .byte 0
+  .long 0
+  .section  __DWARF,__debug_gnu_pubn,regular,debug
+.set Lset14, LpubNames_end0-LpubNames_begin0 ## Length of Public Names Info
+  .long Lset14
+LpubNames_begin0:
+  .short  2                       ## DWARF Version
+.set Lset15, Lcu_begin0-Lsection_info   ## Offset of Compilation Unit Info
+  .long Lset15
+  .long 175                     ## Compilation Unit Length
+  .long 124                     ## DIE offset
+  .byte 48                      ## Attributes: FUNCTION, EXTERNAL
+  .asciz  "foo"                   ## External Name
+  .long 0                       ## End Mark
+LpubNames_end0:
+  .section  __DWARF,__debug_gnu_pubt,regular,debug
+.set Lset16, LpubTypes_end0-LpubTypes_begin0 ## Length of Public Types Info
+  .long Lset16
+LpubTypes_begin0:
+  .short  2                       ## DWARF Version
+.set Lset17, Lcu_begin0-Lsection_info   ## Offset of Compilation Unit Info
+  .long Lset17
+  .long 175                     ## Compilation Unit Length
+  .long 117                     ## DIE offset
+  .byte 144                     ## Attributes: TYPE, STATIC
+  .asciz  "short"                 ## External Name
+  .long 42                      ## DIE offset
+  .byte 16                      ## Attributes: TYPE, EXTERNAL
+  .asciz  "e"                     ## External Name
+  .long 103                     ## DIE offset
+  .byte 144                     ## Attributes: TYPE, STATIC
+  .asciz  "unsigned int"          ## External Name
+  .long 0                       ## End Mark
+LpubTypes_end0:
+
+.subsections_via_symbols
+  .section  __DWARF,__debug_line,regular,debug
+Lsection_line:
+Lline_table_start0: