[llvm] [BOLT][DWARF] Fix out of order rangelists/loclists (PR #81645)
Alexander Yermolovich via llvm-commits
llvm-commits at lists.llvm.org
Tue Feb 13 10:46:38 PST 2024
https://github.com/ayermolo created https://github.com/llvm/llvm-project/pull/81645
GCC can generate rangelists/loclists that are out of order. Fixed so that we don't assert, and instead generate partially optimized list.
>From 6688ded338d608cdfdc9767c5518243d77c1c624 Mon Sep 17 00:00:00 2001
From: Alexander Yermolovich <ayermolo at meta.com>
Date: Mon, 12 Feb 2024 15:50:57 -0800
Subject: [PATCH] [BOLT][DWARF] Fix out of order rangelists/loclists
GCC can generate rangelists/loclists that are out of order. Fixed so that we
don't assert, and instead generate partially optimized list.
---
bolt/lib/Core/DebugData.cpp | 45 +-
bolt/test/X86/dwarf5-loclist-out-of-order.s | 485 ++++++++++++++++++++
2 files changed, 504 insertions(+), 26 deletions(-)
create mode 100644 bolt/test/X86/dwarf5-loclist-out-of-order.s
diff --git a/bolt/lib/Core/DebugData.cpp b/bolt/lib/Core/DebugData.cpp
index 415b0310b6bac8..9d673599c754c4 100644
--- a/bolt/lib/Core/DebugData.cpp
+++ b/bolt/lib/Core/DebugData.cpp
@@ -230,7 +230,7 @@ template <typename DebugVector, typename ListEntry, typename DebugAddressEntry>
static bool emitWithBase(raw_ostream &OS, const DebugVector &Entries,
DebugAddrWriter &AddrWriter, DWARFUnit &CU,
uint32_t &Index, const ListEntry BaseAddressx,
- const ListEntry OffsetPair, const ListEntry EndOfList,
+ const ListEntry OffsetPair,
const std::function<void(uint32_t)> &Func) {
if (Entries.size() < 2)
return false;
@@ -241,7 +241,9 @@ static bool emitWithBase(raw_ostream &OS, const DebugVector &Entries,
const DebugAddressEntry &Entry = Entries[Index];
if (Entry.LowPC == 0)
break;
- assert(Base <= Entry.LowPC && "Entry base is higher than low PC");
+ // In case rnglists or loclists are not sorted.
+ if (Base > Entry.LowPC)
+ break;
uint32_t StartOffset = Entry.LowPC - Base;
uint32_t EndOffset = Entry.HighPC - Base;
if (encodeULEB128(EndOffset, TempBuffer) > 2)
@@ -266,8 +268,6 @@ static bool emitWithBase(raw_ostream &OS, const DebugVector &Entries,
encodeULEB128(OffsetEntry.EndOffset, OS);
Func(OffsetEntry.Index);
}
- support::endian::write(OS, static_cast<uint8_t>(EndOfList),
- llvm::endianness::little);
return true;
}
@@ -276,19 +276,17 @@ DebugRangeListsSectionWriter::addRanges(DebugAddressRangesVector &Ranges) {
std::lock_guard<std::mutex> Lock(WriterMutex);
RangeEntries.push_back(CurrentOffset);
- bool WrittenStartxLength = false;
std::sort(
Ranges.begin(), Ranges.end(),
[](const DebugAddressRange &R1, const DebugAddressRange &R2) -> bool {
return R1.LowPC < R2.LowPC;
});
for (unsigned I = 0; I < Ranges.size();) {
- WrittenStartxLength = false;
if (emitWithBase<DebugAddressRangesVector, dwarf::RnglistEntries,
- DebugAddressRange>(
- *CUBodyStream, Ranges, *AddrWriter, *CU, I,
- dwarf::DW_RLE_base_addressx, dwarf::DW_RLE_offset_pair,
- dwarf::DW_RLE_end_of_list, [](uint32_t Index) -> void {}))
+ DebugAddressRange>(*CUBodyStream, Ranges, *AddrWriter, *CU,
+ I, dwarf::DW_RLE_base_addressx,
+ dwarf::DW_RLE_offset_pair,
+ [](uint32_t Index) -> void {}))
continue;
const DebugAddressRange &Range = Ranges[I];
@@ -299,12 +297,11 @@ DebugRangeListsSectionWriter::addRanges(DebugAddressRangesVector &Ranges) {
encodeULEB128(Index, *CUBodyStream);
encodeULEB128(Range.HighPC - Range.LowPC, *CUBodyStream);
++I;
- WrittenStartxLength = true;
}
- if (WrittenStartxLength)
- support::endian::write(*CUBodyStream,
- static_cast<uint8_t>(dwarf::DW_RLE_end_of_list),
- llvm::endianness::little);
+
+ support::endian::write(*CUBodyStream,
+ static_cast<uint8_t>(dwarf::DW_RLE_end_of_list),
+ llvm::endianness::little);
CurrentOffset = CUBodyBuffer->size();
return RangeEntries.size() - 1;
}
@@ -688,7 +685,6 @@ static void writeDWARF5LocList(uint32_t &NumberOfEntries, DIEValue &AttrInfo,
}
std::vector<uint64_t> OffsetsArray;
- bool WrittenStartxLength = false;
auto writeExpression = [&](uint32_t Index) -> void {
const DebugLocationEntry &Entry = LocList[Index];
encodeULEB128(Entry.Expr.size(), LocBodyStream);
@@ -696,12 +692,11 @@ static void writeDWARF5LocList(uint32_t &NumberOfEntries, DIEValue &AttrInfo,
reinterpret_cast<const char *>(Entry.Expr.data()), Entry.Expr.size());
};
for (unsigned I = 0; I < LocList.size();) {
- WrittenStartxLength = false;
if (emitWithBase<DebugLocationsVector, dwarf::LoclistEntries,
- DebugLocationEntry>(
- LocBodyStream, LocList, AddrWriter, CU, I,
- dwarf::DW_LLE_base_addressx, dwarf::DW_LLE_offset_pair,
- dwarf::DW_LLE_end_of_list, writeExpression))
+ DebugLocationEntry>(LocBodyStream, LocList, AddrWriter, CU,
+ I, dwarf::DW_LLE_base_addressx,
+ dwarf::DW_LLE_offset_pair,
+ writeExpression))
continue;
const DebugLocationEntry &Entry = LocList[I];
@@ -713,13 +708,11 @@ static void writeDWARF5LocList(uint32_t &NumberOfEntries, DIEValue &AttrInfo,
encodeULEB128(Entry.HighPC - Entry.LowPC, LocBodyStream);
writeExpression(I);
++I;
- WrittenStartxLength = true;
}
- if (WrittenStartxLength)
- support::endian::write(LocBodyStream,
- static_cast<uint8_t>(dwarf::DW_LLE_end_of_list),
- llvm::endianness::little);
+ support::endian::write(LocBodyStream,
+ static_cast<uint8_t>(dwarf::DW_LLE_end_of_list),
+ llvm::endianness::little);
}
void DebugLoclistWriter::addList(DIEBuilder &DIEBldr, DIE &Die,
diff --git a/bolt/test/X86/dwarf5-loclist-out-of-order.s b/bolt/test/X86/dwarf5-loclist-out-of-order.s
new file mode 100644
index 00000000000000..acd0bfa5bbef2b
--- /dev/null
+++ b/bolt/test/X86/dwarf5-loclist-out-of-order.s
@@ -0,0 +1,485 @@
+# REQUIRES: system-linux
+
+# RUN: llvm-mc -dwarf-version=5 -filetype=obj -triple x86_64-unknown-linux %s -o %t1.o
+# RUN: %clang %cflags -dwarf-5 %t1.o -o %t.exe -Wl,-q
+# RUN: llvm-bolt %t.exe -o %t.bolt --update-debug-sections --skip-funcs=main
+# RUN: llvm-dwarfdump --show-form --verbose --debug-loclists --debug-addr %t.bolt > %t.txt
+# RUN: llvm-dwarfdump --show-form --verbose --debug-info %t.bolt >> %t.txt
+# RUN: cat %t.txt | FileCheck --check-prefix=POSTCHECK %s
+
+## Tests to make sure BOLT handles correctly locations that are out of order, and the function is not being processed.
+
+# POSTCHECK: DW_LLE_base_addressx
+# POSTCHECK-NEXT: DW_LLE_offset_pair
+# POSTCHECK-NEXT: DW_LLE_offset_pair
+# POSTCHECK-NEXT: DW_LLE_startx_length
+# POSTCHECK-NEXT: DW_LLE_end_of_list
+# POSTCHECK: DW_LLE_base_addressx
+# POSTCHECK-NEXT: DW_LLE_offset_pair
+# POSTCHECK-NEXT: DW_LLE_offset_pair
+# POSTCHECK-NEXT: DW_LLE_end_of_list
+
+# POSTCHECK: Addrs: [
+# POSTCHECK-NEXT: 0x[[#%.16x,ADDR:]]
+# POSTCHECK-NEXT: 0x
+# POSTCHECK-NEXT: 0x
+# POSTCHECK-NEXT: 0x[[#%.16x,ADDR1:]]
+# POSTCHECK-NEXT: 0x
+# POSTCHECK-NEXT: 0x
+
+# POSTCHECK: DW_TAG_formal_parameter
+# POSTCHECK: DW_TAG_formal_parameter
+# POSTCHECK-NEXT: DW_AT_location
+# POSTCHECK-NEXT: [0x[[#ADDR1]], 0x[[#ADDR1 + 0x1a]]): DW_OP_reg3 RBX
+# POSTCHECK-NEXT: [0x[[#ADDR1 + 0x1a]], 0x[[#ADDR1 + 0x1d]]): DW_OP_entry_value(DW_OP_reg5 RDI), DW_OP_stack_value
+# POSTCHECK-NEXT: [0x[[#ADDR]], 0x[[#ADDR + 0x12]]): DW_OP_reg5 RDI)
+
+## clang++ main.cpp -fno-inline-functions -g2 -O2 -S
+## void use(int * x) {
+## *x += 4;
+## }
+## int main(int argc, char *argv[]) {
+## int x = argc;
+## use(&x);
+## x = x + argc;
+## use(&x);
+## return x;
+## }
+
+## Test was manually modified to re-order locations.
+ .text
+ .file "main.cpp"
+ .globl _Z3usePi # -- Begin function _Z3usePi
+ .p2align 4, 0x90
+ .type _Z3usePi, at function
+_Z3usePi: # @_Z3usePi
+.Lfunc_begin0:
+ .file 0 "/repro" "main.cpp" md5 0xe24a1d6afb5e23ce0028f1f33bc08cd7
+ .cfi_startproc
+# %bb.0: # %entry
+ #DEBUG_VALUE: use:x <- $rdi
+ .loc 0 2 8 prologue_end # main.cpp:2:8
+ addl $4, (%rdi)
+ .loc 0 3 1 # main.cpp:3:1
+ retq
+.Ltmp0:
+.Lfunc_end0:
+ .size _Z3usePi, .Lfunc_end0-_Z3usePi
+ .cfi_endproc
+ # -- End function
+ .globl main # -- Begin function main
+ .p2align 4, 0x90
+ .type main, at function
+main: # @main
+.Lfunc_begin1:
+ .loc 0 4 0 # main.cpp:4:0
+ .cfi_startproc
+# %bb.0: # %entry
+ #DEBUG_VALUE: main:argc <- $edi
+ #DEBUG_VALUE: main:argv <- $rsi
+ pushq %r14
+ .cfi_def_cfa_offset 16
+ pushq %rbx
+ .cfi_def_cfa_offset 24
+ pushq %rax
+ .cfi_def_cfa_offset 32
+ .cfi_offset %rbx, -24
+ .cfi_offset %r14, -16
+ movl %edi, %ebx
+.Ltmp1:
+ .loc 0 5 7 prologue_end # main.cpp:5:7
+ movl %edi, 4(%rsp)
+ leaq 4(%rsp), %r14
+ .loc 0 6 3 # main.cpp:6:3
+ movq %r14, %rdi
+.Ltmp2:
+ #DEBUG_VALUE: main:argc <- $ebx
+ callq _Z3usePi
+.Ltmp3:
+ #DEBUG_VALUE: main:argv <- [DW_OP_LLVM_entry_value 1] $rsi
+ .loc 0 7 5 # main.cpp:7:5
+ addl %ebx, 4(%rsp)
+ .loc 0 8 3 # main.cpp:8:3
+ movq %r14, %rdi
+ callq _Z3usePi
+.Ltmp4:
+ .loc 0 9 10 # main.cpp:9:10
+ movl 4(%rsp), %eax
+ .loc 0 9 3 epilogue_begin is_stmt 0 # main.cpp:9:3
+ addq $8, %rsp
+ .cfi_def_cfa_offset 24
+ popq %rbx
+.Ltmp5:
+ #DEBUG_VALUE: main:argc <- [DW_OP_LLVM_entry_value 1] $edi
+ .cfi_def_cfa_offset 16
+ popq %r14
+ .cfi_def_cfa_offset 8
+ retq
+.Ltmp6:
+.Lfunc_end1:
+ .size main, .Lfunc_end1-main
+ .cfi_endproc
+ # -- End function
+ .section .debug_loclists,"", 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 2 # Offset entry count
+.Lloclists_table_base0:
+ .long .Ldebug_loc0-.Lloclists_table_base0
+ .long .Ldebug_loc1-.Lloclists_table_base0
+.Ldebug_loc0:
+ .byte 4 # DW_LLE_offset_pair
+ .uleb128 .Ltmp2-.Lfunc_begin0 # starting offset
+ .uleb128 .Ltmp5-.Lfunc_begin0 # ending offset
+ .byte 1 # Loc expr size
+ .byte 83 # super-register DW_OP_reg3
+ .byte 4 # DW_LLE_offset_pair
+ .uleb128 .Ltmp5-.Lfunc_begin0 # starting offset
+ .uleb128 .Lfunc_end1-.Lfunc_begin0 # ending offset
+ .byte 4 # Loc expr size
+ .byte 163 # DW_OP_entry_value
+ .byte 1 # 1
+ .byte 85 # super-register DW_OP_reg5
+ .byte 159 # DW_OP_stack_value
+ .byte 4 # DW_LLE_offset_pair #manually moved out of order
+ .uleb128 .Lfunc_begin1-.Lfunc_begin0 # starting offset
+ .uleb128 .Ltmp2-.Lfunc_begin0 # ending offset
+ .byte 1 # Loc expr size
+ .byte 85 # super-register DW_OP_reg5
+ .byte 0 # DW_LLE_end_of_list
+.Ldebug_loc1:
+ .byte 4 # DW_LLE_offset_pair
+ .uleb128 .Lfunc_begin1-.Lfunc_begin0 # starting offset
+ .uleb128 .Ltmp3-.Lfunc_begin0 # ending offset
+ .byte 1 # Loc expr size
+ .byte 84 # DW_OP_reg4
+ .byte 4 # DW_LLE_offset_pair
+ .uleb128 .Ltmp3-.Lfunc_begin0 # starting offset
+ .uleb128 .Lfunc_end1-.Lfunc_begin0 # ending offset
+ .byte 4 # Loc expr size
+ .byte 163 # DW_OP_entry_value
+ .byte 1 # 1
+ .byte 84 # DW_OP_reg4
+ .byte 159 # DW_OP_stack_value
+ .byte 0 # DW_LLE_end_of_list
+.Ldebug_list_header_end0:
+ .section .debug_abbrev,"", 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 114 # DW_AT_str_offsets_base
+ .byte 23 # DW_FORM_sec_offset
+ .byte 16 # DW_AT_stmt_list
+ .byte 23 # DW_FORM_sec_offset
+ .byte 27 # DW_AT_comp_dir
+ .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
+ .ascii "\214\001" # DW_AT_loclists_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 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 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 63 # DW_AT_external
+ .byte 25 # DW_FORM_flag_present
+ .byte 0 # EOM(1)
+ .byte 0 # EOM(2)
+ .byte 3 # 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 4 # 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 5 # Abbreviation Code
+ .byte 5 # DW_TAG_formal_parameter
+ .byte 0 # DW_CHILDREN_no
+ .byte 2 # DW_AT_location
+ .byte 34 # DW_FORM_loclistx
+ .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 6 # Abbreviation Code
+ .byte 52 # DW_TAG_variable
+ .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 72 # DW_TAG_call_site
+ .byte 1 # DW_CHILDREN_yes
+ .byte 127 # DW_AT_call_origin
+ .byte 19 # DW_FORM_ref4
+ .byte 125 # DW_AT_call_return_pc
+ .byte 27 # DW_FORM_addrx
+ .byte 0 # EOM(1)
+ .byte 0 # EOM(2)
+ .byte 8 # Abbreviation Code
+ .byte 73 # DW_TAG_call_site_parameter
+ .byte 0 # DW_CHILDREN_no
+ .byte 2 # DW_AT_location
+ .byte 24 # DW_FORM_exprloc
+ .byte 126 # DW_AT_call_value
+ .byte 24 # DW_FORM_exprloc
+ .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 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 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_info,"", at progbits
+.Lcu_begin0:
+ .long .Ldebug_info_end0-.Ldebug_info_start0 # Length of Unit
+.Ldebug_info_start0:
+ .short 5 # DWARF version number
+ .byte 1 # DWARF Unit Type
+ .byte 8 # Address Size (in bytes)
+ .long .debug_abbrev # Offset Into Abbrev. Section
+ .byte 1 # Abbrev [1] 0xc:0x91 DW_TAG_compile_unit
+ .byte 0 # DW_AT_producer
+ .short 33 # DW_AT_language
+ .byte 1 # DW_AT_name
+ .long .Lstr_offsets_base0 # DW_AT_str_offsets_base
+ .long .Lline_table_start0 # DW_AT_stmt_list
+ .byte 2 # DW_AT_comp_dir
+ .byte 0 # DW_AT_low_pc
+ .long .Lfunc_end1-.Lfunc_begin0 # DW_AT_high_pc
+ .long .Laddr_table_base0 # DW_AT_addr_base
+ .long .Lloclists_table_base0 # DW_AT_loclists_base
+ .byte 2 # Abbrev [2] 0x27:0x17 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 3 # DW_AT_linkage_name
+ .byte 4 # DW_AT_name
+ .byte 0 # DW_AT_decl_file
+ .byte 1 # DW_AT_decl_line
+ # DW_AT_external
+ .byte 3 # Abbrev [3] 0x33:0xa DW_TAG_formal_parameter
+ .byte 1 # DW_AT_location
+ .byte 85
+ .byte 7 # DW_AT_name
+ .byte 0 # DW_AT_decl_file
+ .byte 1 # DW_AT_decl_line
+ .long 137 # DW_AT_type
+ .byte 0 # End Of Children Mark
+ .byte 4 # Abbrev [4] 0x3e:0x47 DW_TAG_subprogram
+ .byte 1 # DW_AT_low_pc
+ .long .Lfunc_end1-.Lfunc_begin1 # DW_AT_high_pc
+ .byte 1 # DW_AT_frame_base
+ .byte 87
+ # DW_AT_call_all_calls
+ .byte 5 # DW_AT_name
+ .byte 0 # DW_AT_decl_file
+ .byte 4 # DW_AT_decl_line
+ .long 133 # DW_AT_type
+ # DW_AT_external
+ .byte 5 # Abbrev [5] 0x4d:0x9 DW_TAG_formal_parameter
+ .byte 0 # DW_AT_location
+ .byte 8 # DW_AT_name
+ .byte 0 # DW_AT_decl_file
+ .byte 4 # DW_AT_decl_line
+ .long 133 # DW_AT_type
+ .byte 5 # Abbrev [5] 0x56:0x9 DW_TAG_formal_parameter
+ .byte 1 # DW_AT_location
+ .byte 9 # DW_AT_name
+ .byte 0 # DW_AT_decl_file
+ .byte 4 # DW_AT_decl_line
+ .long 142 # DW_AT_type
+ .byte 6 # Abbrev [6] 0x5f:0xb DW_TAG_variable
+ .byte 2 # DW_AT_location
+ .byte 145
+ .byte 4
+ .byte 7 # DW_AT_name
+ .byte 0 # DW_AT_decl_file
+ .byte 5 # DW_AT_decl_line
+ .long 133 # DW_AT_type
+ .byte 7 # Abbrev [7] 0x6a:0xd DW_TAG_call_site
+ .long 39 # DW_AT_call_origin
+ .byte 2 # DW_AT_call_return_pc
+ .byte 8 # Abbrev [8] 0x70:0x6 DW_TAG_call_site_parameter
+ .byte 1 # DW_AT_location
+ .byte 85
+ .byte 2 # DW_AT_call_value
+ .byte 126
+ .byte 0
+ .byte 0 # End Of Children Mark
+ .byte 7 # Abbrev [7] 0x77:0xd DW_TAG_call_site
+ .long 39 # DW_AT_call_origin
+ .byte 3 # DW_AT_call_return_pc
+ .byte 8 # Abbrev [8] 0x7d:0x6 DW_TAG_call_site_parameter
+ .byte 1 # DW_AT_location
+ .byte 85
+ .byte 2 # DW_AT_call_value
+ .byte 126
+ .byte 0
+ .byte 0 # End Of Children Mark
+ .byte 0 # End Of Children Mark
+ .byte 9 # Abbrev [9] 0x85:0x4 DW_TAG_base_type
+ .byte 6 # DW_AT_name
+ .byte 5 # DW_AT_encoding
+ .byte 4 # DW_AT_byte_size
+ .byte 10 # Abbrev [10] 0x89:0x5 DW_TAG_pointer_type
+ .long 133 # DW_AT_type
+ .byte 10 # Abbrev [10] 0x8e:0x5 DW_TAG_pointer_type
+ .long 147 # DW_AT_type
+ .byte 10 # Abbrev [10] 0x93:0x5 DW_TAG_pointer_type
+ .long 152 # DW_AT_type
+ .byte 9 # Abbrev [9] 0x98:0x4 DW_TAG_base_type
+ .byte 10 # DW_AT_name
+ .byte 6 # DW_AT_encoding
+ .byte 1 # DW_AT_byte_size
+ .byte 0 # End Of Children Mark
+.Ldebug_info_end0:
+ .section .debug_str_offsets,"", at progbits
+ .long 48 # Length of String Offsets Set
+ .short 5
+ .short 0
+.Lstr_offsets_base0:
+ .section .debug_str,"MS", at progbits,1
+.Linfo_string0:
+ .asciz "clang version 19.0.0git (git at github.com:ayermolo/llvm-project.git a1e412af2bf4bf613021f72205f249ab2469f08b)" # string offset=0
+.Linfo_string1:
+ .asciz "main.cpp" # string offset=108
+.Linfo_string2:
+ .asciz "/repro" # string offset=117
+.Linfo_string3:
+ .asciz "_Z3usePi" # string offset=161
+.Linfo_string4:
+ .asciz "use" # string offset=170
+.Linfo_string5:
+ .asciz "main" # string offset=174
+.Linfo_string6:
+ .asciz "int" # string offset=179
+.Linfo_string7:
+ .asciz "x" # string offset=183
+.Linfo_string8:
+ .asciz "argc" # string offset=185
+.Linfo_string9:
+ .asciz "argv" # string offset=190
+.Linfo_string10:
+ .asciz "char" # string offset=195
+ .section .debug_str_offsets,"", at progbits
+ .long .Linfo_string0
+ .long .Linfo_string1
+ .long .Linfo_string2
+ .long .Linfo_string3
+ .long .Linfo_string4
+ .long .Linfo_string5
+ .long .Linfo_string6
+ .long .Linfo_string7
+ .long .Linfo_string8
+ .long .Linfo_string9
+ .long .Linfo_string10
+ .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 .Lfunc_begin1
+ .quad .Ltmp3
+ .quad .Ltmp4
+.Ldebug_addr_end0:
+ .ident "clang version 19.0.0git (git at github.com:ayermolo/llvm-project.git a1e412af2bf4bf613021f72205f249ab2469f08b)"
+ .section ".note.GNU-stack","", at progbits
+ .addrsig
+ .section .debug_line,"", at progbits
+.Lline_table_start0:
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