llvm-dwarfdump: Rebuild type names in dwo type units
authorDavid Blaikie <dblaikie@gmail.com>
Thu, 18 Nov 2021 21:49:32 +0000 (13:49 -0800)
committerDavid Blaikie <dblaikie@gmail.com>
Thu, 18 Nov 2021 22:12:48 +0000 (14:12 -0800)
llvm/include/llvm/DebugInfo/DWARF/DWARFContext.h
llvm/lib/DebugInfo/DWARF/DWARFContext.cpp
llvm/lib/DebugInfo/DWARF/DWARFDie.cpp
llvm/test/tools/llvm-dwarfdump/X86/prettyprint_type_units.s
llvm/test/tools/llvm-dwarfdump/X86/prettyprint_type_units_split_v4.s [new file with mode: 0644]
llvm/test/tools/llvm-dwarfdump/X86/prettyprint_type_units_split_v5.s [new file with mode: 0644]

index 3ece8a1..902973f 100644 (file)
@@ -243,7 +243,7 @@ public:
   }
 
   DWARFCompileUnit *getDWOCompileUnitForHash(uint64_t Hash);
-  DWARFTypeUnit *getTypeUnitForHash(uint16_t Version, uint64_t Hash);
+  DWARFTypeUnit *getTypeUnitForHash(uint16_t Version, uint64_t Hash, bool IsDWO);
 
   /// Return the compile unit that includes an offset (relative to .debug_info).
   DWARFCompileUnit *getCompileUnitForOffset(uint64_t Offset);
index 188bc6b..c833148 100644 (file)
@@ -693,24 +693,15 @@ void DWARFContext::dump(
     getDebugNames().dump(OS);
 }
 
-DWARFTypeUnit *DWARFContext::getTypeUnitForHash(uint16_t Version,
-                                                uint64_t Hash) {
-  // FIXME: Include support for Split DWARF here
-  parseNormalUnits();
-
-  auto IsTypeWithHash = [&](const std::unique_ptr<DWARFUnit> &Unit) {
-    DWARFTypeUnit *TU = dyn_cast<DWARFTypeUnit>(Unit.get());
-    if (!TU)
-      return false;
-    return TU->getTypeHash() == Hash;
-  };
-  auto I = llvm::find_if(types_section_units(), IsTypeWithHash);
-  if (I != types_section_units().end())
-    return cast<DWARFTypeUnit>(I->get());
-  // Search normal .debug_info units in case it's a DWARFv5 type unit.
-  I = llvm::find_if(normal_units(), IsTypeWithHash);
-  if (I != types_section_units().end())
-    return cast<DWARFTypeUnit>(I->get());
+DWARFTypeUnit *DWARFContext::getTypeUnitForHash(uint16_t Version, uint64_t Hash,
+                                                bool IsDWO) {
+  // FIXME: Check for/use the tu_index here, if there is one.
+  for (const auto &U : IsDWO ? dwo_units() : normal_units()) {
+    if (DWARFTypeUnit *TU = dyn_cast<DWARFTypeUnit>(U.get())) {
+      if (TU->getTypeHash() == Hash)
+        return TU;
+    }
+  }
   return nullptr;
 }
 
index 8be8f6a..ed50f26 100644 (file)
@@ -891,8 +891,8 @@ DWARFDie::getAttributeValueAsReferencedDie(const DWARFFormValue &V) const {
 DWARFDie DWARFDie::resolveTypeUnitReference() const {
   if (auto Attr = find(DW_AT_signature)) {
     if (Optional<uint64_t> Sig = Attr->getAsReferenceUVal()) {
-      if (DWARFTypeUnit *TU =
-              U->getContext().getTypeUnitForHash(U->getVersion(), *Sig))
+      if (DWARFTypeUnit *TU = U->getContext().getTypeUnitForHash(
+              U->getVersion(), *Sig, U->isDWOUnit()))
         return TU->getDIEForOffset(TU->getTypeOffset() + TU->getOffset());
     }
   }
index 3b19fda..aad748a 100644 (file)
@@ -21,9 +21,9 @@
 
 
 # CHECK: DW_TAG_template_type_parameter
-# CHECK:   DW_AT_type (0x00000058 "t1")
+# CHECK:   DW_AT_type ({{.*}} "t1")
 # CHECK: DW_TAG_template_type_parameter
-# CHECK:   DW_AT_type (0x00000061 "t2")
+# CHECK:   DW_AT_type ({{.*}} "t2")
 
        .text
        .file   "test.cpp"
diff --git a/llvm/test/tools/llvm-dwarfdump/X86/prettyprint_type_units_split_v4.s b/llvm/test/tools/llvm-dwarfdump/X86/prettyprint_type_units_split_v4.s
new file mode 100644 (file)
index 0000000..e8bb951
--- /dev/null
@@ -0,0 +1,243 @@
+# RUN: llvm-mc < %s -filetype obj -triple x86_64 -o - \
+# RUN:   | llvm-dwarfdump - | FileCheck %s
+
+# Generated from:
+#
+#   struct t1 { };
+#   t1 v1;
+#
+# $ clang++ -S -g -fdebug-types-section -gsplit-dwarf -o test.5.split.s -gdwarf-5 -g
+
+# CHECK: DW_TAG_variable
+# CHECK:   DW_AT_type ({{.*}} "t1")
+
+       .text
+       .file   "test.cpp"
+       .section        .debug_types.dwo,"e",@progbits
+       .long   .Ldebug_info_dwo_end0-.Ldebug_info_dwo_start0 # Length of Unit
+.Ldebug_info_dwo_start0:
+       .short  4                               # DWARF version number
+       .long   0                               # Offset Into Abbrev. Section
+       .byte   8                               # Address Size (in bytes)
+       .quad   -4149699470930386446            # Type Signature
+       .long   30                              # Type DIE Offset
+       .byte   1                               # Abbrev [1] 0x17:0xe DW_TAG_type_unit
+       .short  33                              # DW_AT_language
+       .long   0                               # DW_AT_stmt_list
+       .byte   2                               # Abbrev [2] 0x1e:0x6 DW_TAG_structure_type
+       .byte   5                               # DW_AT_calling_convention
+       .byte   1                               # DW_AT_name
+       .byte   1                               # DW_AT_byte_size
+       .byte   1                               # DW_AT_decl_file
+       .byte   1                               # DW_AT_decl_line
+       .byte   0                               # End Of Children Mark
+.Ldebug_info_dwo_end0:
+       .file   1 "/usr/local/google/home/blaikie/dev/scratch" "test.cpp"
+       .type   v1,@object                      # @v1
+       .bss
+       .globl  v1
+v1:
+       .zero   1
+       .size   v1, 1
+
+       .section        .debug_abbrev,"",@progbits
+       .byte   1                               # Abbreviation Code
+       .byte   17                              # DW_TAG_compile_unit
+       .byte   0                               # DW_CHILDREN_no
+       .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  "\260B"                         # DW_AT_GNU_dwo_name
+       .byte   14                              # DW_FORM_strp
+       .ascii  "\261B"                         # DW_AT_GNU_dwo_id
+       .byte   7                               # DW_FORM_data8
+       .ascii  "\263B"                         # DW_AT_GNU_addr_base
+       .byte   23                              # DW_FORM_sec_offset
+       .byte   0                               # EOM(1)
+       .byte   0                               # EOM(2)
+       .byte   0                               # EOM(3)
+       .section        .debug_info,"",@progbits
+.Lcu_begin0:
+       .long   .Ldebug_info_end0-.Ldebug_info_start0 # Length of Unit
+.Ldebug_info_start0:
+       .short  4                               # DWARF version number
+       .long   .debug_abbrev                   # Offset Into Abbrev. Section
+       .byte   8                               # Address Size (in bytes)
+       .byte   1                               # Abbrev [1] 0xb:0x19 DW_TAG_compile_unit
+       .long   .Lline_table_start0             # DW_AT_stmt_list
+       .long   .Lskel_string0                  # DW_AT_comp_dir
+                                        # DW_AT_GNU_pubnames
+       .long   .Lskel_string1                  # DW_AT_GNU_dwo_name
+       .quad   5272896739482311860             # DW_AT_GNU_dwo_id
+       .long   .Laddr_table_base0              # DW_AT_GNU_addr_base
+.Ldebug_info_end0:
+       .section        .debug_str,"MS",@progbits,1
+.Lskel_string0:
+       .asciz  "/usr/local/google/home/blaikie/dev/scratch" # string offset=0
+.Lskel_string1:
+       .asciz  "test.dwo"                      # string offset=43
+       .section        .debug_str.dwo,"eMS",@progbits,1
+.Linfo_string0:
+       .asciz  "v1"                            # string offset=0
+.Linfo_string1:
+       .asciz  "t1"                            # string offset=3
+.Linfo_string2:
+       .asciz  "clang version 14.0.0 (git@github.com:llvm/llvm-project.git c9e46219f38da5c3fbfe41012173dc893516826e)" # string offset=6
+.Linfo_string3:
+       .asciz  "test.cpp"                      # string offset=107
+.Linfo_string4:
+       .asciz  "test.dwo"                      # string offset=116
+       .section        .debug_str_offsets.dwo,"e",@progbits
+       .long   0
+       .long   3
+       .long   6
+       .long   107
+       .long   116
+       .section        .debug_info.dwo,"e",@progbits
+       .long   .Ldebug_info_dwo_end1-.Ldebug_info_dwo_start1 # Length of Unit
+.Ldebug_info_dwo_start1:
+       .short  4                               # DWARF version number
+       .long   0                               # Offset Into Abbrev. Section
+       .byte   8                               # Address Size (in bytes)
+       .byte   3                               # Abbrev [3] 0xb:0x23 DW_TAG_compile_unit
+       .byte   2                               # DW_AT_producer
+       .short  33                              # DW_AT_language
+       .byte   3                               # DW_AT_name
+       .byte   4                               # DW_AT_GNU_dwo_name
+       .quad   5272896739482311860             # DW_AT_GNU_dwo_id
+       .byte   4                               # Abbrev [4] 0x19:0xb DW_TAG_variable
+       .byte   0                               # DW_AT_name
+       .long   36                              # DW_AT_type
+                                        # DW_AT_external
+       .byte   1                               # DW_AT_decl_file
+       .byte   2                               # DW_AT_decl_line
+       .byte   2                               # DW_AT_location
+       .byte   251
+       .byte   0
+       .byte   5                               # Abbrev [5] 0x24:0x9 DW_TAG_structure_type
+                                        # DW_AT_declaration
+       .quad   -4149699470930386446            # DW_AT_signature
+       .byte   0                               # End Of Children Mark
+.Ldebug_info_dwo_end1:
+       .section        .debug_abbrev.dwo,"e",@progbits
+       .byte   1                               # Abbreviation Code
+       .byte   65                              # DW_TAG_type_unit
+       .byte   1                               # DW_CHILDREN_yes
+       .byte   19                              # DW_AT_language
+       .byte   5                               # DW_FORM_data2
+       .byte   16                              # DW_AT_stmt_list
+       .byte   23                              # DW_FORM_sec_offset
+       .byte   0                               # EOM(1)
+       .byte   0                               # EOM(2)
+       .byte   2                               # Abbreviation Code
+       .byte   19                              # DW_TAG_structure_type
+       .byte   0                               # DW_CHILDREN_no
+       .byte   54                              # DW_AT_calling_convention
+       .byte   11                              # DW_FORM_data1
+       .byte   3                               # DW_AT_name
+       .ascii  "\202>"                         # DW_FORM_GNU_str_index
+       .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   3                               # Abbreviation Code
+       .byte   17                              # DW_TAG_compile_unit
+       .byte   1                               # DW_CHILDREN_yes
+       .byte   37                              # DW_AT_producer
+       .ascii  "\202>"                         # DW_FORM_GNU_str_index
+       .byte   19                              # DW_AT_language
+       .byte   5                               # DW_FORM_data2
+       .byte   3                               # DW_AT_name
+       .ascii  "\202>"                         # DW_FORM_GNU_str_index
+       .ascii  "\260B"                         # DW_AT_GNU_dwo_name
+       .ascii  "\202>"                         # DW_FORM_GNU_str_index
+       .ascii  "\261B"                         # DW_AT_GNU_dwo_id
+       .byte   7                               # DW_FORM_data8
+       .byte   0                               # EOM(1)
+       .byte   0                               # EOM(2)
+       .byte   4                               # Abbreviation Code
+       .byte   52                              # DW_TAG_variable
+       .byte   0                               # DW_CHILDREN_no
+       .byte   3                               # DW_AT_name
+       .ascii  "\202>"                         # DW_FORM_GNU_str_index
+       .byte   73                              # DW_AT_type
+       .byte   19                              # DW_FORM_ref4
+       .byte   63                              # DW_AT_external
+       .byte   25                              # DW_FORM_flag_present
+       .byte   58                              # DW_AT_decl_file
+       .byte   11                              # DW_FORM_data1
+       .byte   59                              # DW_AT_decl_line
+       .byte   11                              # DW_FORM_data1
+       .byte   2                               # DW_AT_location
+       .byte   24                              # DW_FORM_exprloc
+       .byte   0                               # EOM(1)
+       .byte   0                               # EOM(2)
+       .byte   5                               # Abbreviation Code
+       .byte   19                              # DW_TAG_structure_type
+       .byte   0                               # DW_CHILDREN_no
+       .byte   60                              # DW_AT_declaration
+       .byte   25                              # DW_FORM_flag_present
+       .byte   105                             # DW_AT_signature
+       .byte   32                              # DW_FORM_ref_sig8
+       .byte   0                               # EOM(1)
+       .byte   0                               # EOM(2)
+       .byte   0                               # EOM(3)
+       .section        .debug_line.dwo,"e",@progbits
+.Ltmp0:
+       .long   .Ldebug_line_end0-.Ldebug_line_start0 # unit length
+.Ldebug_line_start0:
+       .short  4
+       .long   .Lprologue_end0-.Lprologue_start0
+.Lprologue_start0:
+       .byte   1
+       .byte   1
+       .byte   1
+       .byte   -5
+       .byte   14
+       .byte   1
+       .byte   0
+       .ascii  "test.cpp"
+       .byte   0
+       .byte   0
+       .byte   0
+       .byte   0
+       .byte   0
+.Lprologue_end0:
+.Ldebug_line_end0:
+       .section        .debug_addr,"",@progbits
+.Laddr_table_base0:
+       .quad   v1
+       .section        .debug_gnu_pubnames,"",@progbits
+       .long   .LpubNames_end0-.LpubNames_start0 # Length of Public Names Info
+.LpubNames_start0:
+       .short  2                               # DWARF Version
+       .long   .Lcu_begin0                     # Offset of Compilation Unit Info
+       .long   36                              # Compilation Unit Length
+       .long   25                              # DIE offset
+       .byte   32                              # Attributes: VARIABLE, EXTERNAL
+       .asciz  "v1"                            # External Name
+       .long   0                               # End Mark
+.LpubNames_end0:
+       .section        .debug_gnu_pubtypes,"",@progbits
+       .long   .LpubTypes_end0-.LpubTypes_start0 # Length of Public Types Info
+.LpubTypes_start0:
+       .short  2                               # DWARF Version
+       .long   .Lcu_begin0                     # Offset of Compilation Unit Info
+       .long   36                              # Compilation Unit Length
+       .long   36                              # DIE offset
+       .byte   16                              # Attributes: TYPE, EXTERNAL
+       .asciz  "t1"                            # External Name
+       .long   0                               # End Mark
+.LpubTypes_end0:
+       .ident  "clang version 14.0.0 (git@github.com:llvm/llvm-project.git c9e46219f38da5c3fbfe41012173dc893516826e)"
+       .section        ".note.GNU-stack","",@progbits
+       .addrsig
+       .section        .debug_line,"",@progbits
+.Lline_table_start0:
diff --git a/llvm/test/tools/llvm-dwarfdump/X86/prettyprint_type_units_split_v5.s b/llvm/test/tools/llvm-dwarfdump/X86/prettyprint_type_units_split_v5.s
new file mode 100644 (file)
index 0000000..e8bb951
--- /dev/null
@@ -0,0 +1,243 @@
+# RUN: llvm-mc < %s -filetype obj -triple x86_64 -o - \
+# RUN:   | llvm-dwarfdump - | FileCheck %s
+
+# Generated from:
+#
+#   struct t1 { };
+#   t1 v1;
+#
+# $ clang++ -S -g -fdebug-types-section -gsplit-dwarf -o test.5.split.s -gdwarf-5 -g
+
+# CHECK: DW_TAG_variable
+# CHECK:   DW_AT_type ({{.*}} "t1")
+
+       .text
+       .file   "test.cpp"
+       .section        .debug_types.dwo,"e",@progbits
+       .long   .Ldebug_info_dwo_end0-.Ldebug_info_dwo_start0 # Length of Unit
+.Ldebug_info_dwo_start0:
+       .short  4                               # DWARF version number
+       .long   0                               # Offset Into Abbrev. Section
+       .byte   8                               # Address Size (in bytes)
+       .quad   -4149699470930386446            # Type Signature
+       .long   30                              # Type DIE Offset
+       .byte   1                               # Abbrev [1] 0x17:0xe DW_TAG_type_unit
+       .short  33                              # DW_AT_language
+       .long   0                               # DW_AT_stmt_list
+       .byte   2                               # Abbrev [2] 0x1e:0x6 DW_TAG_structure_type
+       .byte   5                               # DW_AT_calling_convention
+       .byte   1                               # DW_AT_name
+       .byte   1                               # DW_AT_byte_size
+       .byte   1                               # DW_AT_decl_file
+       .byte   1                               # DW_AT_decl_line
+       .byte   0                               # End Of Children Mark
+.Ldebug_info_dwo_end0:
+       .file   1 "/usr/local/google/home/blaikie/dev/scratch" "test.cpp"
+       .type   v1,@object                      # @v1
+       .bss
+       .globl  v1
+v1:
+       .zero   1
+       .size   v1, 1
+
+       .section        .debug_abbrev,"",@progbits
+       .byte   1                               # Abbreviation Code
+       .byte   17                              # DW_TAG_compile_unit
+       .byte   0                               # DW_CHILDREN_no
+       .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  "\260B"                         # DW_AT_GNU_dwo_name
+       .byte   14                              # DW_FORM_strp
+       .ascii  "\261B"                         # DW_AT_GNU_dwo_id
+       .byte   7                               # DW_FORM_data8
+       .ascii  "\263B"                         # DW_AT_GNU_addr_base
+       .byte   23                              # DW_FORM_sec_offset
+       .byte   0                               # EOM(1)
+       .byte   0                               # EOM(2)
+       .byte   0                               # EOM(3)
+       .section        .debug_info,"",@progbits
+.Lcu_begin0:
+       .long   .Ldebug_info_end0-.Ldebug_info_start0 # Length of Unit
+.Ldebug_info_start0:
+       .short  4                               # DWARF version number
+       .long   .debug_abbrev                   # Offset Into Abbrev. Section
+       .byte   8                               # Address Size (in bytes)
+       .byte   1                               # Abbrev [1] 0xb:0x19 DW_TAG_compile_unit
+       .long   .Lline_table_start0             # DW_AT_stmt_list
+       .long   .Lskel_string0                  # DW_AT_comp_dir
+                                        # DW_AT_GNU_pubnames
+       .long   .Lskel_string1                  # DW_AT_GNU_dwo_name
+       .quad   5272896739482311860             # DW_AT_GNU_dwo_id
+       .long   .Laddr_table_base0              # DW_AT_GNU_addr_base
+.Ldebug_info_end0:
+       .section        .debug_str,"MS",@progbits,1
+.Lskel_string0:
+       .asciz  "/usr/local/google/home/blaikie/dev/scratch" # string offset=0
+.Lskel_string1:
+       .asciz  "test.dwo"                      # string offset=43
+       .section        .debug_str.dwo,"eMS",@progbits,1
+.Linfo_string0:
+       .asciz  "v1"                            # string offset=0
+.Linfo_string1:
+       .asciz  "t1"                            # string offset=3
+.Linfo_string2:
+       .asciz  "clang version 14.0.0 (git@github.com:llvm/llvm-project.git c9e46219f38da5c3fbfe41012173dc893516826e)" # string offset=6
+.Linfo_string3:
+       .asciz  "test.cpp"                      # string offset=107
+.Linfo_string4:
+       .asciz  "test.dwo"                      # string offset=116
+       .section        .debug_str_offsets.dwo,"e",@progbits
+       .long   0
+       .long   3
+       .long   6
+       .long   107
+       .long   116
+       .section        .debug_info.dwo,"e",@progbits
+       .long   .Ldebug_info_dwo_end1-.Ldebug_info_dwo_start1 # Length of Unit
+.Ldebug_info_dwo_start1:
+       .short  4                               # DWARF version number
+       .long   0                               # Offset Into Abbrev. Section
+       .byte   8                               # Address Size (in bytes)
+       .byte   3                               # Abbrev [3] 0xb:0x23 DW_TAG_compile_unit
+       .byte   2                               # DW_AT_producer
+       .short  33                              # DW_AT_language
+       .byte   3                               # DW_AT_name
+       .byte   4                               # DW_AT_GNU_dwo_name
+       .quad   5272896739482311860             # DW_AT_GNU_dwo_id
+       .byte   4                               # Abbrev [4] 0x19:0xb DW_TAG_variable
+       .byte   0                               # DW_AT_name
+       .long   36                              # DW_AT_type
+                                        # DW_AT_external
+       .byte   1                               # DW_AT_decl_file
+       .byte   2                               # DW_AT_decl_line
+       .byte   2                               # DW_AT_location
+       .byte   251
+       .byte   0
+       .byte   5                               # Abbrev [5] 0x24:0x9 DW_TAG_structure_type
+                                        # DW_AT_declaration
+       .quad   -4149699470930386446            # DW_AT_signature
+       .byte   0                               # End Of Children Mark
+.Ldebug_info_dwo_end1:
+       .section        .debug_abbrev.dwo,"e",@progbits
+       .byte   1                               # Abbreviation Code
+       .byte   65                              # DW_TAG_type_unit
+       .byte   1                               # DW_CHILDREN_yes
+       .byte   19                              # DW_AT_language
+       .byte   5                               # DW_FORM_data2
+       .byte   16                              # DW_AT_stmt_list
+       .byte   23                              # DW_FORM_sec_offset
+       .byte   0                               # EOM(1)
+       .byte   0                               # EOM(2)
+       .byte   2                               # Abbreviation Code
+       .byte   19                              # DW_TAG_structure_type
+       .byte   0                               # DW_CHILDREN_no
+       .byte   54                              # DW_AT_calling_convention
+       .byte   11                              # DW_FORM_data1
+       .byte   3                               # DW_AT_name
+       .ascii  "\202>"                         # DW_FORM_GNU_str_index
+       .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   3                               # Abbreviation Code
+       .byte   17                              # DW_TAG_compile_unit
+       .byte   1                               # DW_CHILDREN_yes
+       .byte   37                              # DW_AT_producer
+       .ascii  "\202>"                         # DW_FORM_GNU_str_index
+       .byte   19                              # DW_AT_language
+       .byte   5                               # DW_FORM_data2
+       .byte   3                               # DW_AT_name
+       .ascii  "\202>"                         # DW_FORM_GNU_str_index
+       .ascii  "\260B"                         # DW_AT_GNU_dwo_name
+       .ascii  "\202>"                         # DW_FORM_GNU_str_index
+       .ascii  "\261B"                         # DW_AT_GNU_dwo_id
+       .byte   7                               # DW_FORM_data8
+       .byte   0                               # EOM(1)
+       .byte   0                               # EOM(2)
+       .byte   4                               # Abbreviation Code
+       .byte   52                              # DW_TAG_variable
+       .byte   0                               # DW_CHILDREN_no
+       .byte   3                               # DW_AT_name
+       .ascii  "\202>"                         # DW_FORM_GNU_str_index
+       .byte   73                              # DW_AT_type
+       .byte   19                              # DW_FORM_ref4
+       .byte   63                              # DW_AT_external
+       .byte   25                              # DW_FORM_flag_present
+       .byte   58                              # DW_AT_decl_file
+       .byte   11                              # DW_FORM_data1
+       .byte   59                              # DW_AT_decl_line
+       .byte   11                              # DW_FORM_data1
+       .byte   2                               # DW_AT_location
+       .byte   24                              # DW_FORM_exprloc
+       .byte   0                               # EOM(1)
+       .byte   0                               # EOM(2)
+       .byte   5                               # Abbreviation Code
+       .byte   19                              # DW_TAG_structure_type
+       .byte   0                               # DW_CHILDREN_no
+       .byte   60                              # DW_AT_declaration
+       .byte   25                              # DW_FORM_flag_present
+       .byte   105                             # DW_AT_signature
+       .byte   32                              # DW_FORM_ref_sig8
+       .byte   0                               # EOM(1)
+       .byte   0                               # EOM(2)
+       .byte   0                               # EOM(3)
+       .section        .debug_line.dwo,"e",@progbits
+.Ltmp0:
+       .long   .Ldebug_line_end0-.Ldebug_line_start0 # unit length
+.Ldebug_line_start0:
+       .short  4
+       .long   .Lprologue_end0-.Lprologue_start0
+.Lprologue_start0:
+       .byte   1
+       .byte   1
+       .byte   1
+       .byte   -5
+       .byte   14
+       .byte   1
+       .byte   0
+       .ascii  "test.cpp"
+       .byte   0
+       .byte   0
+       .byte   0
+       .byte   0
+       .byte   0
+.Lprologue_end0:
+.Ldebug_line_end0:
+       .section        .debug_addr,"",@progbits
+.Laddr_table_base0:
+       .quad   v1
+       .section        .debug_gnu_pubnames,"",@progbits
+       .long   .LpubNames_end0-.LpubNames_start0 # Length of Public Names Info
+.LpubNames_start0:
+       .short  2                               # DWARF Version
+       .long   .Lcu_begin0                     # Offset of Compilation Unit Info
+       .long   36                              # Compilation Unit Length
+       .long   25                              # DIE offset
+       .byte   32                              # Attributes: VARIABLE, EXTERNAL
+       .asciz  "v1"                            # External Name
+       .long   0                               # End Mark
+.LpubNames_end0:
+       .section        .debug_gnu_pubtypes,"",@progbits
+       .long   .LpubTypes_end0-.LpubTypes_start0 # Length of Public Types Info
+.LpubTypes_start0:
+       .short  2                               # DWARF Version
+       .long   .Lcu_begin0                     # Offset of Compilation Unit Info
+       .long   36                              # Compilation Unit Length
+       .long   36                              # DIE offset
+       .byte   16                              # Attributes: TYPE, EXTERNAL
+       .asciz  "t1"                            # External Name
+       .long   0                               # End Mark
+.LpubTypes_end0:
+       .ident  "clang version 14.0.0 (git@github.com:llvm/llvm-project.git c9e46219f38da5c3fbfe41012173dc893516826e)"
+       .section        ".note.GNU-stack","",@progbits
+       .addrsig
+       .section        .debug_line,"",@progbits
+.Lline_table_start0: