[llvm] [BOLT][DWARF] Skip processing DWARF CUs with a DWO ID but no DWO name. (PR #154749)
Jinjie Huang via llvm-commits
llvm-commits at lists.llvm.org
Mon Sep 15 05:12:32 PDT 2025
https://github.com/Jinjie-Huang updated https://github.com/llvm/llvm-project/pull/154749
>From 744c824b86f629482df6718120bdf856c4377392 Mon Sep 17 00:00:00 2001
From: huangjinjie <huangjinjie at bytedance.com>
Date: Mon, 15 Sep 2025 20:11:54 +0800
Subject: [PATCH] add isValidDwarfUnit() to indentify if DU is valid
---
bolt/include/bolt/Core/BinaryContext.h | 3 +
bolt/include/bolt/Core/DIEBuilder.h | 2 +-
bolt/lib/Core/BinaryContext.cpp | 15 +
bolt/lib/Core/DIEBuilder.cpp | 10 +-
bolt/test/X86/dwarf5-dwoid-no-dwoname.s | 630 ++++++++++++++++++++++++
5 files changed, 656 insertions(+), 4 deletions(-)
create mode 100644 bolt/test/X86/dwarf5-dwoid-no-dwoname.s
diff --git a/bolt/include/bolt/Core/BinaryContext.h b/bolt/include/bolt/Core/BinaryContext.h
index 72c8817daa714..0a2ff1a211651 100644
--- a/bolt/include/bolt/Core/BinaryContext.h
+++ b/bolt/include/bolt/Core/BinaryContext.h
@@ -326,6 +326,9 @@ class BinaryContext {
/// Returns true if DWARF4 or lower is used.
bool isDWARFLegacyUsed() const { return ContainsDwarfLegacy; }
+ // Return true if DWARFUnit is valid.
+ bool isValidDwarfUnit(DWARFUnit *const DU) const;
+
std::map<unsigned, DwarfLineTable> &getDwarfLineTables() {
return DwarfLineTablesCUMap;
}
diff --git a/bolt/include/bolt/Core/DIEBuilder.h b/bolt/include/bolt/Core/DIEBuilder.h
index e4a4fc6b2f258..69c81c282d611 100644
--- a/bolt/include/bolt/Core/DIEBuilder.h
+++ b/bolt/include/bolt/Core/DIEBuilder.h
@@ -217,7 +217,7 @@ class DIEBuilder {
std::optional<BOLTDWARF5AccelTableData *> Parent,
uint32_t NumberParentsInChain);
- void registerUnit(DWARFUnit &DU, bool NeedSort);
+ bool registerUnit(DWARFUnit &DU, bool NeedSort);
/// \return the unique ID of \p U if it exists.
std::optional<uint32_t> getUnitId(const DWARFUnit &DU);
diff --git a/bolt/lib/Core/BinaryContext.cpp b/bolt/lib/Core/BinaryContext.cpp
index 72c72bbaf4a65..2f62025ea66f4 100644
--- a/bolt/lib/Core/BinaryContext.cpp
+++ b/bolt/lib/Core/BinaryContext.cpp
@@ -1624,10 +1624,25 @@ DWARFContext *BinaryContext::getDWOContext() const {
return &DWOCUs.begin()->second->getContext();
}
+bool BinaryContext::isValidDwarfUnit(DWARFUnit *const DU) const {
+ // Invalid DWARF unit with a DWOId but lacking a dwo_name.
+ if (DU->getDWOId() && !DU->isDWOUnit() &&
+ !DU->getUnitDIE().find({dwarf::DW_AT_dwo_name, dwarf::DW_AT_GNU_dwo_name})) {
+ this->outs() << "BOLT-ERROR: Broken DWARF found in CU at offset 0x"
+ << Twine::utohexstr(DU->getOffset()) << " (DWOId=0x"
+ << Twine::utohexstr(*(DU->getDWOId()))
+ << ", missing DW_AT_dwo_name / DW_AT_GNU_dwo_name).\n";
+ return false;
+ }
+ return true;
+}
+
/// Handles DWO sections that can either be in .o, .dwo or .dwp files.
void BinaryContext::preprocessDWODebugInfo() {
for (const std::unique_ptr<DWARFUnit> &CU : DwCtx->compile_units()) {
DWARFUnit *const DwarfUnit = CU.get();
+ if (!isValidDwarfUnit(DwarfUnit))
+ continue;
if (std::optional<uint64_t> DWOId = DwarfUnit->getDWOId()) {
std::string DWOName = dwarf::toString(
DwarfUnit->getUnitDIE().find(
diff --git a/bolt/lib/Core/DIEBuilder.cpp b/bolt/lib/Core/DIEBuilder.cpp
index b041dc5ea1cce..16da3d7e2173e 100644
--- a/bolt/lib/Core/DIEBuilder.cpp
+++ b/bolt/lib/Core/DIEBuilder.cpp
@@ -584,7 +584,8 @@ DWARFDie DIEBuilder::resolveDIEReference(
if ((RefCU =
getUnitForOffset(*this, *DwarfContext, TmpRefOffset, AttrSpec))) {
/// Trying to add to current working set in case it's cross CU reference.
- registerUnit(*RefCU, true);
+ if (!registerUnit(*RefCU, true))
+ return DWARFDie();
DWARFDataExtractor DebugInfoData = RefCU->getDebugInfoExtractor();
if (DwarfDebugInfoEntry.extractFast(*RefCU, &TmpRefOffset, DebugInfoData,
RefCU->getNextUnitOffset(), 0)) {
@@ -1008,12 +1009,14 @@ static uint64_t getHash(const DWARFUnit &DU) {
return DU.getOffset();
}
-void DIEBuilder::registerUnit(DWARFUnit &DU, bool NeedSort) {
+bool DIEBuilder::registerUnit(DWARFUnit &DU, bool NeedSort) {
+ if (!BC.isValidDwarfUnit(&DU))
+ return false;
auto IterGlobal = AllProcessed.insert(getHash(DU));
// If DU is already in a current working set or was already processed we can
// skip it.
if (!IterGlobal.second)
- return;
+ return true;
if (getState().Type == ProcessingType::DWARF4TUs) {
getState().DWARF4TUVector.push_back(&DU);
} else if (getState().Type == ProcessingType::DWARF5TUs) {
@@ -1034,6 +1037,7 @@ void DIEBuilder::registerUnit(DWARFUnit &DU, bool NeedSort) {
if (getState().DUList.size() == getState().CloneUnitCtxMap.size())
getState().CloneUnitCtxMap.emplace_back();
getState().DUList.push_back(&DU);
+ return true;
}
std::optional<uint32_t> DIEBuilder::getUnitId(const DWARFUnit &DU) {
diff --git a/bolt/test/X86/dwarf5-dwoid-no-dwoname.s b/bolt/test/X86/dwarf5-dwoid-no-dwoname.s
new file mode 100644
index 0000000000000..f8150cfc7d3b7
--- /dev/null
+++ b/bolt/test/X86/dwarf5-dwoid-no-dwoname.s
@@ -0,0 +1,630 @@
+## This test checks that broken DWARF—having
+## a DWOId but missing a DWOName—is correctly detected.
+# RUN: rm -rf %t && mkdir -p %t && cd %t
+# RUN: llvm-mc -dwarf-version=5 -filetype=obj -triple x86_64-unknown-linux %s -split-dwarf-file=main.dwo -o main.o
+# RUN: %clang -O3 -g -gdwarf-5 -gsplit-dwarf -Wl,-q %t/main.o -o main.exe
+# RUN: llvm-bolt %t/main.exe -o %t/main.exe.bolt -update-debug-sections 2>&1 | FileCheck %s --check-prefix=PRECHECK
+# PRECHECK: BOLT-ERROR: Broken DWARF found in CU at offset 0x3e (DWOId=0x0, missing DW_AT_dwo_name / DW_AT_GNU_dwo_name).
+
+## Checks that Broken dwarf CU is removed
+# RUN: llvm-dwarfdump --show-form --verbose --debug-info %t/main.exe.bolt | FileCheck %s --check-prefix=POSTCHECK
+# POSTCHECK-LABEL: .debug_info contents:
+# POSTCHECK: DW_TAG_skeleton_unit
+# POSTCHECK-DAG: DW_AT_dwo_name{{.*=.*\.dwo.*}}
+# POSTCHECK: NULL
+# POSTCHECK-NOT: DW_TAG_skeleton_unit
+
+ .text
+ .file "main.cpp"
+ .section .rodata.cst16,"aM", at progbits,16
+.LCPI0_0:
+.LCPI0_1:
+.LCPI0_2:
+.LCPI0_3:
+.LCPI0_4:
+.LCPI0_5:
+.LCPI0_6:
+.LCPI0_7:
+.LCPI0_8:
+.LCPI0_9:
+.LCPI0_10:
+ .text
+ .globl main
+ .type main, at function
+main: # @main
+.Lfunc_begin0:
+ .file 1 "." "main.cpp" md5 0x8a68374187457ce14ac0c6c2121349a2
+ .loc 1 5 0 # main.cpp:5:0
+# %bb.0: # %vector.ph
+.Ltmp0:
+.Ltmp1:
+.LBB0_1: # %vector.body
+.Ltmp2:
+ .file 2 "." "callee.cpp" md5 0x86e19c24983503540b9bb1a6f7bad737
+ .loc 2 8 15 prologue_end # callee.cpp:8:15
+.Ltmp3:
+ .loc 2 3 15 # callee.cpp:3:15
+.Ltmp4:
+ .loc 2 8 15 # callee.cpp:8:15
+.Ltmp5:
+ .loc 2 9 19 # callee.cpp:9:19
+.Ltmp6:
+ .loc 2 9 13 is_stmt 0 # callee.cpp:9:13
+.Ltmp7:
+ .loc 2 3 15 is_stmt 1 # callee.cpp:3:15
+ .loc 2 3 19 is_stmt 0 # callee.cpp:3:19
+.Ltmp8:
+ .loc 2 4 19 is_stmt 1 # callee.cpp:4:19
+.Ltmp9:
+ .loc 2 4 13 is_stmt 0 # callee.cpp:4:13
+.Ltmp10:
+ .loc 2 4 19 # callee.cpp:4:19
+.Ltmp11:
+ .loc 2 4 13 # callee.cpp:4:13
+.Ltmp12:
+ .loc 2 2 12 is_stmt 1 # callee.cpp:2:12
+ .loc 2 2 17 is_stmt 0 # callee.cpp:2:17
+.Ltmp13:
+ .loc 2 4 13 is_stmt 1 # callee.cpp:4:13
+.Ltmp14:
+ .loc 2 0 0 is_stmt 0 # callee.cpp:0:0
+.Ltmp15:
+ .loc 1 8 13 is_stmt 1 # main.cpp:8:13
+.Ltmp16:
+ .loc 2 0 0 is_stmt 0 # callee.cpp:0:0
+.Ltmp17:
+ .loc 1 8 13 # main.cpp:8:13
+.Ltmp18:
+ .loc 1 7 35 is_stmt 1 # main.cpp:7:35
+.Ltmp19:
+# %bb.2: # %middle.block
+ .loc 1 7 5 is_stmt 0 # main.cpp:7:5
+.Ltmp20:
+ .loc 1 11 9 is_stmt 1 # main.cpp:11:9
+.Ltmp21:
+ .loc 1 15 1 # main.cpp:15:1
+ retq
+.Ltmp22:
+.Lfunc_end0:
+ .size main, .Lfunc_end0-main
+ .section .debug_abbrev,"", at progbits
+ .byte 1 # Abbreviation Code
+ .byte 74 # DW_TAG_skeleton_unit
+ .byte 1 # DW_CHILDREN_yes
+ .byte 16 # DW_AT_stmt_list
+ .byte 23 # DW_FORM_sec_offset
+ .byte 114 # DW_AT_str_offsets_base
+ .byte 23 # DW_FORM_sec_offset
+ .byte 27 # DW_AT_comp_dir
+ .byte 37 # DW_FORM_strx1
+ .ascii "\264B" # DW_AT_GNU_pubnames
+ .byte 25 # DW_FORM_flag_present
+ .byte 118 # DW_AT_dwo_name
+ .byte 37 # DW_FORM_strx1
+ .byte 17 # DW_AT_low_pc
+ .byte 27 # DW_FORM_addrx
+ .byte 18 # DW_AT_high_pc
+ .byte 6 # DW_FORM_data4
+ .byte 115 # DW_AT_addr_base
+ .byte 23 # DW_FORM_sec_offset
+ .byte 116 # DW_AT_rnglists_base
+ .byte 23 # DW_FORM_sec_offset
+ .byte 0 # EOM(1)
+ .byte 0 # EOM(2)
+ .byte 2 # Abbreviation Code
+ .byte 46 # DW_TAG_subprogram
+ .byte 1 # DW_CHILDREN_yes
+ .byte 17 # DW_AT_low_pc
+ .byte 27 # DW_FORM_addrx
+ .byte 18 # DW_AT_high_pc
+ .byte 6 # DW_FORM_data4
+ .byte 3 # DW_AT_name
+ .byte 37 # DW_FORM_strx1
+ .byte 0 # EOM(1)
+ .byte 0 # EOM(2)
+ .byte 3 # Abbreviation Code
+ .byte 29 # DW_TAG_inlined_subroutine
+ .byte 0 # DW_CHILDREN_no
+ .byte 49 # DW_AT_abstract_origin
+ .byte 16 # DW_FORM_ref_addr
+ .byte 85 # DW_AT_ranges
+ .byte 35 # DW_FORM_rnglistx
+ .byte 88 # DW_AT_call_file
+ .byte 11 # DW_FORM_data1
+ .byte 89 # DW_AT_call_line
+ .byte 11 # DW_FORM_data1
+ .byte 87 # DW_AT_call_column
+ .byte 11 # DW_FORM_data1
+ .byte 0 # EOM(1)
+ .byte 0 # EOM(2)
+ .byte 4 # Abbreviation Code
+ .byte 74 # DW_TAG_skeleton_unit
+ .byte 1 # DW_CHILDREN_yes
+ .byte 16 # DW_AT_stmt_list
+ .byte 23 # DW_FORM_sec_offset
+ .byte 114 # DW_AT_str_offsets_base
+ .byte 23 # DW_FORM_sec_offset
+ .byte 27 # DW_AT_comp_dir
+ .byte 37 # DW_FORM_strx1
+ .ascii "\264B" # DW_AT_GNU_pubnames
+ .byte 25 # DW_FORM_flag_present
+ .byte 37 # DW_AT_producer
+ .byte 37 # DW_FORM_strx1
+ .byte 19 # DW_AT_language
+ .byte 5 # DW_FORM_data2
+ .byte 3 # DW_AT_name
+ .byte 37 # DW_FORM_strx1
+ .byte 115 # DW_AT_addr_base
+ .byte 23 # DW_FORM_sec_offset
+ .byte 0 # EOM(1)
+ .byte 0 # EOM(2)
+ .byte 5 # Abbreviation Code
+ .byte 46 # DW_TAG_subprogram
+ .byte 0 # DW_CHILDREN_no
+ .byte 3 # DW_AT_name
+ .byte 37 # DW_FORM_strx1
+ .byte 32 # DW_AT_inline
+ .byte 33 # DW_FORM_implicit_const
+ .byte 1
+ .byte 0 # EOM(1)
+ .byte 0 # EOM(2)
+ .byte 0 # EOM(3)
+ .section .debug_info,"", at progbits
+.Lcu_begin0:
+ .long .Ldebug_info_end0-.Ldebug_info_start0 # Length of Unit
+.Ldebug_info_start0:
+ .short 5 # DWARF version number
+ .byte 4 # DWARF Unit Type
+ .byte 8 # Address Size (in bytes)
+ .long .debug_abbrev # Offset Into Abbrev. Section
+ .quad -1861901018463438211
+ .byte 1 # Abbrev [1] 0x14:0x2a DW_TAG_skeleton_unit
+ .long .Lline_table_start0 # DW_AT_stmt_list
+ .long .Lstr_offsets_base0 # DW_AT_str_offsets_base
+ .byte 0 # DW_AT_comp_dir
+ # DW_AT_GNU_pubnames
+ .byte 3 # DW_AT_dwo_name
+ .byte 0 # DW_AT_low_pc
+ .long .Lfunc_end0-.Lfunc_begin0 # DW_AT_high_pc
+ .long .Laddr_table_base0 # DW_AT_addr_base
+ .long .Lrnglists_table_base0 # DW_AT_rnglists_base
+ .byte 2 # Abbrev [2] 0x2c:0x11 DW_TAG_subprogram
+ .byte 0 # DW_AT_low_pc
+ .long .Lfunc_end0-.Lfunc_begin0 # DW_AT_high_pc
+ .byte 2 # DW_AT_name
+ .byte 3 # Abbrev [3] 0x33:0x9 DW_TAG_inlined_subroutine
+ .long .debug_info+100 # DW_AT_abstract_origin
+ .byte 0 # DW_AT_ranges
+ .byte 1 # DW_AT_call_file
+ .byte 8 # DW_AT_call_line
+ .byte 16 # DW_AT_call_column
+ .byte 0 # End Of Children Mark
+ .byte 0 # End Of Children Mark
+.Ldebug_info_end0:
+.Lcu_begin1:
+ .long .Ldebug_info_end1-.Ldebug_info_start1 # Length of Unit
+.Ldebug_info_start1:
+ .short 5 # DWARF version number
+ .byte 4 # DWARF Unit Type
+ .byte 8 # Address Size (in bytes)
+ .long .debug_abbrev # Offset Into Abbrev. Section
+ .quad 0
+ .byte 4 # Abbrev [4] 0x14:0x15 DW_TAG_skeleton_unit
+ .long .Lline_table_start0 # DW_AT_stmt_list
+ .long .Lstr_offsets_base0 # DW_AT_str_offsets_base
+ .byte 0 # DW_AT_comp_dir
+ # DW_AT_GNU_pubnames
+ .byte 4 # DW_AT_producer
+ .short 33 # DW_AT_language
+ .byte 5 # DW_AT_name
+ .long .Laddr_table_base0 # DW_AT_addr_base
+ .byte 5 # Abbrev [5] 0x26:0x2 DW_TAG_subprogram
+ .byte 1 # DW_AT_name
+ # DW_AT_inline
+ .byte 0 # End Of Children Mark
+.Ldebug_info_end1:
+ .section .debug_rnglists,"", at progbits
+ .long .Ldebug_list_header_end0-.Ldebug_list_header_start0 # Length
+.Ldebug_list_header_start0:
+ .short 5 # Version
+ .byte 8 # Address size
+ .byte 0 # Segment selector size
+ .long 1 # Offset entry count
+.Lrnglists_table_base0:
+ .long .Ldebug_ranges1-.Lrnglists_table_base0
+.Ldebug_ranges1:
+ .byte 4 # DW_RLE_offset_pair
+ .uleb128 .Ltmp2-.Lfunc_begin0 # starting offset
+ .uleb128 .Ltmp15-.Lfunc_begin0 # ending offset
+ .byte 4 # DW_RLE_offset_pair
+ .uleb128 .Ltmp16-.Lfunc_begin0 # starting offset
+ .uleb128 .Ltmp17-.Lfunc_begin0 # ending offset
+ .byte 0 # DW_RLE_end_of_list
+.Ldebug_list_header_end0:
+ .section .debug_str_offsets,"", at progbits
+ .long 28 # Length of String Offsets Set
+ .short 5
+ .short 0
+.Lstr_offsets_base0:
+ .section .debug_str,"MS", at progbits,1
+.Lskel_string0:
+ .asciz "." # string offset=0
+.Lskel_string1:
+ .asciz "hotFunction" # string offset=45
+.Lskel_string2:
+ .asciz "main" # string offset=57
+.Lskel_string3:
+ .asciz "main.dwo" # string offset=62
+.Lskel_string4:
+ .asciz "clang version 16.0.6" # string offset=71
+.Lskel_string5:
+ .asciz "callee.cpp" # string offset=177
+ .section .debug_str_offsets,"", at progbits
+ .long .Lskel_string0
+ .long .Lskel_string1
+ .long .Lskel_string2
+ .long .Lskel_string3
+ .long .Lskel_string4
+ .long .Lskel_string5
+ .section .debug_str_offsets.dwo,"e", at progbits
+ .long 56 # Length of String Offsets Set
+ .short 5
+ .short 0
+ .section .debug_str.dwo,"eMS", at progbits,1
+.Linfo_string0:
+ .asciz "_Z11hotFunctioni" # string offset=0
+.Linfo_string1:
+ .asciz "hotFunction" # string offset=17
+.Linfo_string2:
+ .asciz "int" # string offset=29
+.Linfo_string3:
+ .asciz "x" # string offset=33
+.Linfo_string4:
+ .asciz "main" # string offset=35
+.Linfo_string5:
+ .asciz "argc" # string offset=40
+.Linfo_string6:
+ .asciz "argv" # string offset=45
+.Linfo_string7:
+ .asciz "char" # string offset=50
+.Linfo_string8:
+ .asciz "sum" # string offset=55
+.Linfo_string9:
+ .asciz "i" # string offset=59
+.Linfo_string10:
+ .asciz "clang version 16.0.6" # string offset=61
+.Linfo_string11:
+ .asciz "main.cpp" # string offset=167
+.Linfo_string12:
+ .asciz "main.dwo" # string offset=176
+ .section .debug_str_offsets.dwo,"e", at progbits
+ .long 0
+ .long 17
+ .long 29
+ .long 33
+ .long 35
+ .long 40
+ .long 45
+ .long 50
+ .long 55
+ .long 59
+ .long 61
+ .long 167
+ .long 176
+ .section .debug_info.dwo,"e", at progbits
+ .long .Ldebug_info_dwo_end0-.Ldebug_info_dwo_start0 # Length of Unit
+.Ldebug_info_dwo_start0:
+ .short 5 # DWARF version number
+ .byte 5 # DWARF Unit Type
+ .byte 8 # Address Size (in bytes)
+ .long 0 # Offset Into Abbrev. Section
+ .quad -1861901018463438211
+ .byte 1 # Abbrev [1] 0x14:0x71 DW_TAG_compile_unit
+ .byte 10 # DW_AT_producer
+ .short 33 # DW_AT_language
+ .byte 11 # DW_AT_name
+ .byte 12 # DW_AT_dwo_name
+ .byte 2 # Abbrev [2] 0x1a:0x12 DW_TAG_subprogram
+ .byte 0 # DW_AT_linkage_name
+ .byte 1 # DW_AT_name
+ .byte 2 # DW_AT_decl_file
+ .byte 1 # DW_AT_decl_line
+ .long 44 # DW_AT_type
+ # DW_AT_external
+ # DW_AT_inline
+ .byte 3 # Abbrev [3] 0x23:0x8 DW_TAG_formal_parameter
+ .byte 3 # DW_AT_name
+ .byte 2 # DW_AT_decl_file
+ .byte 1 # DW_AT_decl_line
+ .long 44 # DW_AT_type
+ .byte 0 # End Of Children Mark
+ .byte 4 # Abbrev [4] 0x2c:0x4 DW_TAG_base_type
+ .byte 2 # DW_AT_name
+ .byte 5 # DW_AT_encoding
+ .byte 4 # DW_AT_byte_size
+ .byte 5 # Abbrev [5] 0x30:0x46 DW_TAG_subprogram
+ .byte 0 # DW_AT_low_pc
+ .long .Lfunc_end0-.Lfunc_begin0 # DW_AT_high_pc
+ .byte 1 # DW_AT_frame_base
+ .byte 87
+ # DW_AT_call_all_calls
+ .byte 4 # DW_AT_name
+ .byte 1 # DW_AT_decl_file
+ .byte 5 # DW_AT_decl_line
+ .long 44 # DW_AT_type
+ # DW_AT_external
+ .byte 6 # Abbrev [6] 0x3f:0xa DW_TAG_formal_parameter
+ .byte 1 # DW_AT_location
+ .byte 85
+ .byte 5 # DW_AT_name
+ .byte 1 # DW_AT_decl_file
+ .byte 5 # DW_AT_decl_line
+ .long 44 # DW_AT_type
+ .byte 6 # Abbrev [6] 0x49:0xa DW_TAG_formal_parameter
+ .byte 1 # DW_AT_location
+ .byte 84
+ .byte 6 # DW_AT_name
+ .byte 1 # DW_AT_decl_file
+ .byte 5 # DW_AT_decl_line
+ .long 118 # DW_AT_type
+ .byte 7 # Abbrev [7] 0x53:0x9 DW_TAG_variable
+ .byte 0 # DW_AT_const_value
+ .byte 8 # DW_AT_name
+ .byte 1 # DW_AT_decl_file
+ .byte 6 # DW_AT_decl_line
+ .long 44 # DW_AT_type
+ .byte 8 # Abbrev [8] 0x5c:0x19 DW_TAG_lexical_block
+ .byte 1 # DW_AT_low_pc
+ .long .Ltmp20-.Ltmp2 # DW_AT_high_pc
+ .byte 7 # Abbrev [7] 0x62:0x9 DW_TAG_variable
+ .byte 0 # DW_AT_const_value
+ .byte 9 # DW_AT_name
+ .byte 1 # DW_AT_decl_file
+ .byte 7 # DW_AT_decl_line
+ .long 44 # DW_AT_type
+ .byte 9 # Abbrev [9] 0x6b:0x9 DW_TAG_inlined_subroutine
+ .long 26 # DW_AT_abstract_origin
+ .byte 0 # DW_AT_ranges
+ .byte 1 # DW_AT_call_file
+ .byte 8 # DW_AT_call_line
+ .byte 16 # DW_AT_call_column
+ .byte 0 # End Of Children Mark
+ .byte 0 # End Of Children Mark
+ .byte 10 # Abbrev [10] 0x76:0x5 DW_TAG_pointer_type
+ .long 123 # DW_AT_type
+ .byte 10 # Abbrev [10] 0x7b:0x5 DW_TAG_pointer_type
+ .long 128 # DW_AT_type
+ .byte 4 # Abbrev [4] 0x80:0x4 DW_TAG_base_type
+ .byte 7 # DW_AT_name
+ .byte 6 # DW_AT_encoding
+ .byte 1 # DW_AT_byte_size
+ .byte 0 # End Of Children Mark
+.Ldebug_info_dwo_end0:
+ .section .debug_abbrev.dwo,"e", at progbits
+ .byte 1 # Abbreviation Code
+ .byte 17 # DW_TAG_compile_unit
+ .byte 1 # DW_CHILDREN_yes
+ .byte 37 # DW_AT_producer
+ .byte 37 # DW_FORM_strx1
+ .byte 19 # DW_AT_language
+ .byte 5 # DW_FORM_data2
+ .byte 3 # DW_AT_name
+ .byte 37 # DW_FORM_strx1
+ .byte 118 # DW_AT_dwo_name
+ .byte 37 # DW_FORM_strx1
+ .byte 0 # EOM(1)
+ .byte 0 # EOM(2)
+ .byte 2 # Abbreviation Code
+ .byte 46 # DW_TAG_subprogram
+ .byte 1 # DW_CHILDREN_yes
+ .byte 110 # DW_AT_linkage_name
+ .byte 37 # DW_FORM_strx1
+ .byte 3 # DW_AT_name
+ .byte 37 # DW_FORM_strx1
+ .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 32 # DW_AT_inline
+ .byte 33 # DW_FORM_implicit_const
+ .byte 1
+ .byte 0 # EOM(1)
+ .byte 0 # EOM(2)
+ .byte 3 # Abbreviation Code
+ .byte 5 # DW_TAG_formal_parameter
+ .byte 0 # DW_CHILDREN_no
+ .byte 3 # DW_AT_name
+ .byte 37 # DW_FORM_strx1
+ .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 4 # Abbreviation Code
+ .byte 36 # DW_TAG_base_type
+ .byte 0 # DW_CHILDREN_no
+ .byte 3 # DW_AT_name
+ .byte 37 # DW_FORM_strx1
+ .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 5 # Abbreviation Code
+ .byte 46 # DW_TAG_subprogram
+ .byte 1 # DW_CHILDREN_yes
+ .byte 17 # DW_AT_low_pc
+ .byte 27 # DW_FORM_addrx
+ .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 3 # DW_AT_name
+ .byte 37 # DW_FORM_strx1
+ .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 6 # Abbreviation Code
+ .byte 5 # DW_TAG_formal_parameter
+ .byte 0 # DW_CHILDREN_no
+ .byte 2 # DW_AT_location
+ .byte 24 # DW_FORM_exprloc
+ .byte 3 # DW_AT_name
+ .byte 37 # DW_FORM_strx1
+ .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 7 # Abbreviation Code
+ .byte 52 # DW_TAG_variable
+ .byte 0 # DW_CHILDREN_no
+ .byte 28 # DW_AT_const_value
+ .byte 13 # DW_FORM_sdata
+ .byte 3 # DW_AT_name
+ .byte 37 # DW_FORM_strx1
+ .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 8 # Abbreviation Code
+ .byte 11 # DW_TAG_lexical_block
+ .byte 1 # DW_CHILDREN_yes
+ .byte 17 # DW_AT_low_pc
+ .byte 27 # DW_FORM_addrx
+ .byte 18 # DW_AT_high_pc
+ .byte 6 # DW_FORM_data4
+ .byte 0 # EOM(1)
+ .byte 0 # EOM(2)
+ .byte 9 # Abbreviation Code
+ .byte 29 # DW_TAG_inlined_subroutine
+ .byte 0 # DW_CHILDREN_no
+ .byte 49 # DW_AT_abstract_origin
+ .byte 19 # DW_FORM_ref4
+ .byte 85 # DW_AT_ranges
+ .byte 35 # DW_FORM_rnglistx
+ .byte 88 # DW_AT_call_file
+ .byte 11 # DW_FORM_data1
+ .byte 89 # DW_AT_call_line
+ .byte 11 # DW_FORM_data1
+ .byte 87 # DW_AT_call_column
+ .byte 11 # DW_FORM_data1
+ .byte 0 # EOM(1)
+ .byte 0 # EOM(2)
+ .byte 10 # 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 .debug_rnglists.dwo,"e", at progbits
+ .long .Ldebug_list_header_end1-.Ldebug_list_header_start1 # Length
+.Ldebug_list_header_start1:
+ .short 5 # Version
+ .byte 8 # Address size
+ .byte 0 # Segment selector size
+ .long 1 # Offset entry count
+.Lrnglists_dwo_table_base0:
+ .long .Ldebug_ranges0-.Lrnglists_dwo_table_base0
+.Ldebug_ranges0:
+ .byte 4 # DW_RLE_offset_pair
+ .uleb128 .Ltmp2-.Lfunc_begin0 # starting offset
+ .uleb128 .Ltmp15-.Lfunc_begin0 # ending offset
+ .byte 4 # DW_RLE_offset_pair
+ .uleb128 .Ltmp16-.Lfunc_begin0 # starting offset
+ .uleb128 .Ltmp17-.Lfunc_begin0 # ending offset
+ .byte 0 # DW_RLE_end_of_list
+.Ldebug_list_header_end1:
+ .section .debug_addr,"", at progbits
+ .long .Ldebug_addr_end0-.Ldebug_addr_start0 # Length of contribution
+.Ldebug_addr_start0:
+ .short 5 # DWARF version number
+ .byte 8 # Address size
+ .byte 0 # Segment selector size
+.Laddr_table_base0:
+ .quad .Lfunc_begin0
+ .quad .Ltmp2
+.Ldebug_addr_end0:
+ .section .debug_gnu_pubnames,"", at 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 62 # Compilation Unit Length
+ .long 26 # DIE offset
+ .byte 48 # Attributes: FUNCTION, EXTERNAL
+ .asciz "hotFunction" # External Name
+ .long 48 # DIE offset
+ .byte 48 # Attributes: FUNCTION, EXTERNAL
+ .asciz "main" # External Name
+ .long 0 # End Mark
+.LpubNames_end0:
+ .section .debug_gnu_pubtypes,"", at 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 62 # Compilation Unit Length
+ .long 44 # DIE offset
+ .byte 144 # Attributes: TYPE, STATIC
+ .asciz "int" # External Name
+ .long 128 # DIE offset
+ .byte 144 # Attributes: TYPE, STATIC
+ .asciz "char" # External Name
+ .long 0 # End Mark
+.LpubTypes_end0:
+ .section .debug_gnu_pubnames,"", at progbits
+ .long .LpubNames_end1-.LpubNames_start1 # Length of Public Names Info
+.LpubNames_start1:
+ .short 2 # DWARF Version
+ .long .Lcu_begin1 # Offset of Compilation Unit Info
+ .long 41 # Compilation Unit Length
+ .long 0 # End Mark
+.LpubNames_end1:
+ .section .debug_gnu_pubtypes,"", at progbits
+ .long .LpubTypes_end1-.LpubTypes_start1 # Length of Public Types Info
+.LpubTypes_start1:
+ .short 2 # DWARF Version
+ .long .Lcu_begin1 # Offset of Compilation Unit Info
+ .long 41 # Compilation Unit Length
+ .long 0 # End Mark
+.LpubTypes_end1:
+ .ident "clang version 16.0.6"
+ .ident "clang version 16.0.6"
+ .section .GCC.command.line,"MS", at progbits,1
+ .zero 1
+ .ascii ""
+ .zero 1
+ .ascii ""
+ .zero 1
+ .section .debug_gnu_pubtypes,"", at progbits
+ .section ".note.GNU-stack","", at progbits
+ .addrsig
+ .section .debug_line,"", at progbits
+.Lline_table_start0:
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