[llvm] [BOLT][DWARF] Fix output ranges for deleted code (PR #73464)
Maksim Panchenko via llvm-commits
llvm-commits at lists.llvm.org
Tue Nov 28 22:26:02 PST 2023
https://github.com/maksfb updated https://github.com/llvm/llvm-project/pull/73464
>From 0ffb626f1d5678e6f7bb78d22398a666567b6f52 Mon Sep 17 00:00:00 2001
From: Maksim Panchenko <maks at fb.com>
Date: Sun, 26 Nov 2023 13:54:48 -0800
Subject: [PATCH] [BOLT][DWARF] Fix output ranges for deleted code
Set range low_pc to 0 for DIEs that correspond to deleted code.
Fixes #73428
---
bolt/lib/Rewrite/DWARFRewriter.cpp | 3 +-
bolt/test/X86/dwarf4-deleted-range.s | 432 ++++++++++++++++++++++++
bolt/test/X86/dwarf5-deleted-range.s | 484 +++++++++++++++++++++++++++
3 files changed, 917 insertions(+), 2 deletions(-)
create mode 100644 bolt/test/X86/dwarf4-deleted-range.s
create mode 100644 bolt/test/X86/dwarf5-deleted-range.s
diff --git a/bolt/lib/Rewrite/DWARFRewriter.cpp b/bolt/lib/Rewrite/DWARFRewriter.cpp
index 360b82f45bd7754..f137f6603bf1189 100644
--- a/bolt/lib/Rewrite/DWARFRewriter.cpp
+++ b/bolt/lib/Rewrite/DWARFRewriter.cpp
@@ -963,8 +963,7 @@ void DWARFRewriter::updateUnitDebugInfo(
std::move(OutputRanges), CachedRanges);
OutputRanges.clear();
} else if (OutputRanges.empty()) {
- OutputRanges.push_back({RangesOrError.get().front().LowPC,
- RangesOrError.get().front().HighPC});
+ OutputRanges.push_back({0, RangesOrError.get().front().HighPC});
}
} else if (!RangesOrError) {
consumeError(RangesOrError.takeError());
diff --git a/bolt/test/X86/dwarf4-deleted-range.s b/bolt/test/X86/dwarf4-deleted-range.s
new file mode 100644
index 000000000000000..7938bc001c00790
--- /dev/null
+++ b/bolt/test/X86/dwarf4-deleted-range.s
@@ -0,0 +1,432 @@
+# REQUIRES: system-linux
+
+# RUN: llvm-mc -dwarf-version=4 -filetype=obj -triple x86_64-unknown-linux %s -o %tmain.o
+# RUN: %clang %cflags -no-pie %s -o %t.exe -Wl,-q
+# RUN: llvm-bolt %t.exe -o %t.bolt --update-debug-sections
+# RUN: llvm-dwarfdump --show-children --name=main --debug-info %t.bolt \
+# RUN: | FileCheck %s
+
+# CHECK: DW_TAG_inlined_subroutine
+# CHECK: DW_AT_low_pc
+# CHECK-SAME: 0x0000000000000000
+
+# CHECK: DW_TAG_GNU_call_site
+# CHECK: DW_AT_low_pc
+# CHECK-SAME: 0x0000000000000000
+
+## Test that llvm-bolt correctly updates DIEs corresponding to deleted code.
+
+# Test case built from the following source using:
+#
+# clang -O2 -g ...
+#
+# Assembly modified with "je" -> "jmp" to introduce unreachable block.
+#
+# extern void puts(const char *);
+#
+# static void foo() {
+# puts("hi");
+# }
+#
+# int main(int argc, char **argv) {
+# if (argc)
+# foo();
+# return 0;
+# }
+
+ .text
+ .file "unreachable.c"
+ .file 1 "." "unreachable.c"
+ .globl main # -- Begin function main
+ .p2align 4, 0x90
+ .type main, at function
+main: # @main
+.Lfunc_begin0:
+ .loc 1 7 0 # unreachable.c:7:0
+ .cfi_startproc
+# %bb.0:
+ #DEBUG_VALUE: main:argc <- $edi
+ #DEBUG_VALUE: main:argv <- $rsi
+ .loc 1 8 7 prologue_end # unreachable.c:8:7
+ testl %edi, %edi
+.Ltmp0:
+ .loc 1 8 7 is_stmt 0 # unreachable.c:8:7
+ jmp .LBB0_2
+.Ltmp1:
+# %bb.1:
+ #DEBUG_VALUE: main:argc <- $edi
+ #DEBUG_VALUE: main:argv <- $rsi
+ pushq %rax
+ .cfi_def_cfa_offset 16
+.Ltmp2:
+ .loc 1 4 3 is_stmt 1 # unreachable.c:4:3
+ movl $.L.str, %edi
+.Ltmp3:
+ #DEBUG_VALUE: main:argc <- [DW_OP_LLVM_entry_value 1] $edi
+ callq puts
+.Ltmp4:
+ #DEBUG_VALUE: main:argv <- [DW_OP_LLVM_entry_value 1] $rsi
+ .loc 1 0 3 is_stmt 0 # unreachable.c:0:3
+ addq $8, %rsp
+.Ltmp5:
+ .cfi_def_cfa_offset 8
+.LBB0_2:
+ #DEBUG_VALUE: main:argc <- [DW_OP_LLVM_entry_value 1] $edi
+ #DEBUG_VALUE: main:argv <- [DW_OP_LLVM_entry_value 1] $rsi
+ .loc 1 10 3 is_stmt 1 # unreachable.c:10:3
+ xorl %eax, %eax
+ retq
+.Ltmp6:
+.Lfunc_end0:
+ .size main, .Lfunc_end0-main
+ .cfi_endproc
+ # -- End function
+ .type .L.str, at object # @.str
+ .section .rodata.str1.1,"aMS", at progbits,1
+.L.str:
+ .asciz "hi"
+ .size .L.str, 3
+
+ .section .debug_loc,"", at progbits
+.Ldebug_loc0:
+ .quad .Lfunc_begin0-.Lfunc_begin0
+ .quad .Ltmp3-.Lfunc_begin0
+ .short 1 # Loc expr size
+ .byte 85 # super-register DW_OP_reg5
+ .quad .Ltmp3-.Lfunc_begin0
+ .quad .Lfunc_end0-.Lfunc_begin0
+ .short 4 # Loc expr size
+ .byte 243 # DW_OP_GNU_entry_value
+ .byte 1 # 1
+ .byte 85 # super-register DW_OP_reg5
+ .byte 159 # DW_OP_stack_value
+ .quad 0
+ .quad 0
+.Ldebug_loc1:
+ .quad .Lfunc_begin0-.Lfunc_begin0
+ .quad .Ltmp4-.Lfunc_begin0
+ .short 1 # Loc expr size
+ .byte 84 # DW_OP_reg4
+ .quad .Ltmp4-.Lfunc_begin0
+ .quad .Lfunc_end0-.Lfunc_begin0
+ .short 4 # Loc expr size
+ .byte 243 # DW_OP_GNU_entry_value
+ .byte 1 # 1
+ .byte 84 # DW_OP_reg4
+ .byte 159 # DW_OP_stack_value
+ .quad 0
+ .quad 0
+ .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 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
+ .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 52 # DW_TAG_variable
+ .byte 0 # DW_CHILDREN_no
+ .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 2 # DW_AT_location
+ .byte 24 # DW_FORM_exprloc
+ .byte 0 # EOM(1)
+ .byte 0 # EOM(2)
+ .byte 3 # 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 4 # 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 11 # DW_FORM_data1
+ .byte 0 # EOM(1)
+ .byte 0 # EOM(2)
+ .byte 5 # 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 6 # 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 7 # Abbreviation Code
+ .byte 46 # DW_TAG_subprogram
+ .byte 0 # DW_CHILDREN_no
+ .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 32 # DW_AT_inline
+ .byte 11 # DW_FORM_data1
+ .byte 0 # EOM(1)
+ .byte 0 # EOM(2)
+ .byte 8 # 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
+ .ascii "\227B" # DW_AT_GNU_all_call_sites
+ .byte 25 # DW_FORM_flag_present
+ .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 39 # DW_AT_prototyped
+ .byte 25 # DW_FORM_flag_present
+ .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 9 # Abbreviation Code
+ .byte 5 # DW_TAG_formal_parameter
+ .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 10 # 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 17 # DW_AT_low_pc
+ .byte 1 # DW_FORM_addr
+ .byte 18 # DW_AT_high_pc
+ .byte 6 # DW_FORM_data4
+ .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 11 # Abbreviation Code
+ .ascii "\211\202\001" # DW_TAG_GNU_call_site
+ .byte 0 # DW_CHILDREN_no
+ .byte 49 # DW_AT_abstract_origin
+ .byte 19 # DW_FORM_ref4
+ .byte 17 # DW_AT_low_pc
+ .byte 1 # DW_FORM_addr
+ .byte 0 # EOM(1)
+ .byte 0 # EOM(2)
+ .byte 12 # Abbreviation Code
+ .byte 46 # DW_TAG_subprogram
+ .byte 1 # DW_CHILDREN_yes
+ .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 39 # DW_AT_prototyped
+ .byte 25 # DW_FORM_flag_present
+ .byte 60 # DW_AT_declaration
+ .byte 25 # DW_FORM_flag_present
+ .byte 63 # DW_AT_external
+ .byte 25 # DW_FORM_flag_present
+ .byte 0 # EOM(1)
+ .byte 0 # EOM(2)
+ .byte 13 # Abbreviation Code
+ .byte 5 # DW_TAG_formal_parameter
+ .byte 0 # DW_CHILDREN_no
+ .byte 73 # DW_AT_type
+ .byte 19 # DW_FORM_ref4
+ .byte 0 # EOM(1)
+ .byte 0 # EOM(2)
+ .byte 14 # 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 15 # Abbreviation Code
+ .byte 38 # DW_TAG_const_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 4 # DWARF version number
+ .long .debug_abbrev # Offset Into Abbrev. Section
+ .byte 8 # Address Size (in bytes)
+ .byte 1 # Abbrev [1] 0xb:0xd4 DW_TAG_compile_unit
+ .long .Linfo_string0 # DW_AT_producer
+ .short 12 # DW_AT_language
+ .long .Linfo_string1 # DW_AT_name
+ .long .Lline_table_start0 # DW_AT_stmt_list
+ .long .Linfo_string2 # DW_AT_comp_dir
+ .quad .Lfunc_begin0 # DW_AT_low_pc
+ .long .Lfunc_end0-.Lfunc_begin0 # DW_AT_high_pc
+ .byte 2 # Abbrev [2] 0x2a:0x11 DW_TAG_variable
+ .long 59 # DW_AT_type
+ .byte 1 # DW_AT_decl_file
+ .byte 4 # DW_AT_decl_line
+ .byte 9 # DW_AT_location
+ .byte 3
+ .quad .L.str
+ .byte 3 # Abbrev [3] 0x3b:0xc DW_TAG_array_type
+ .long 71 # DW_AT_type
+ .byte 4 # Abbrev [4] 0x40:0x6 DW_TAG_subrange_type
+ .long 78 # DW_AT_type
+ .byte 3 # DW_AT_count
+ .byte 0 # End Of Children Mark
+ .byte 5 # Abbrev [5] 0x47:0x7 DW_TAG_base_type
+ .long .Linfo_string3 # DW_AT_name
+ .byte 6 # DW_AT_encoding
+ .byte 1 # DW_AT_byte_size
+ .byte 6 # Abbrev [6] 0x4e:0x7 DW_TAG_base_type
+ .long .Linfo_string4 # DW_AT_name
+ .byte 8 # DW_AT_byte_size
+ .byte 7 # DW_AT_encoding
+ .byte 7 # Abbrev [7] 0x55:0x8 DW_TAG_subprogram
+ .long .Linfo_string5 # DW_AT_name
+ .byte 1 # DW_AT_decl_file
+ .byte 3 # DW_AT_decl_line
+ .byte 1 # DW_AT_inline
+ .byte 8 # Abbrev [8] 0x5d:0x59 DW_TAG_subprogram
+ .quad .Lfunc_begin0 # DW_AT_low_pc
+ .long .Lfunc_end0-.Lfunc_begin0 # DW_AT_high_pc
+ .byte 1 # DW_AT_frame_base
+ .byte 87
+ # DW_AT_GNU_all_call_sites
+ .long .Linfo_string7 # DW_AT_name
+ .byte 1 # DW_AT_decl_file
+ .byte 7 # DW_AT_decl_line
+ # DW_AT_prototyped
+ .long 205 # DW_AT_type
+ # DW_AT_external
+ .byte 9 # Abbrev [9] 0x76:0xf DW_TAG_formal_parameter
+ .long .Ldebug_loc0 # DW_AT_location
+ .long .Linfo_string9 # DW_AT_name
+ .byte 1 # DW_AT_decl_file
+ .byte 7 # DW_AT_decl_line
+ .long 205 # DW_AT_type
+ .byte 9 # Abbrev [9] 0x85:0xf DW_TAG_formal_parameter
+ .long .Ldebug_loc1 # DW_AT_location
+ .long .Linfo_string10 # DW_AT_name
+ .byte 1 # DW_AT_decl_file
+ .byte 7 # DW_AT_decl_line
+ .long 212 # DW_AT_type
+ .byte 10 # Abbrev [10] 0x94:0x14 DW_TAG_inlined_subroutine
+ .long 85 # DW_AT_abstract_origin
+ .quad .Ltmp2 # DW_AT_low_pc
+ .long .Ltmp5-.Ltmp2 # DW_AT_high_pc
+ .byte 1 # DW_AT_call_file
+ .byte 9 # DW_AT_call_line
+ .byte 5 # DW_AT_call_column
+ .byte 11 # Abbrev [11] 0xa8:0xd DW_TAG_GNU_call_site
+ .long 182 # DW_AT_abstract_origin
+ .quad .Ltmp4 # DW_AT_low_pc
+ .byte 0 # End Of Children Mark
+ .byte 12 # Abbrev [12] 0xb6:0xd DW_TAG_subprogram
+ .long .Linfo_string6 # DW_AT_name
+ .byte 1 # DW_AT_decl_file
+ .byte 1 # DW_AT_decl_line
+ # DW_AT_prototyped
+ # DW_AT_declaration
+ # DW_AT_external
+ .byte 13 # Abbrev [13] 0xbd:0x5 DW_TAG_formal_parameter
+ .long 195 # DW_AT_type
+ .byte 0 # End Of Children Mark
+ .byte 14 # Abbrev [14] 0xc3:0x5 DW_TAG_pointer_type
+ .long 200 # DW_AT_type
+ .byte 15 # Abbrev [15] 0xc8:0x5 DW_TAG_const_type
+ .long 71 # DW_AT_type
+ .byte 5 # Abbrev [5] 0xcd:0x7 DW_TAG_base_type
+ .long .Linfo_string8 # DW_AT_name
+ .byte 5 # DW_AT_encoding
+ .byte 4 # DW_AT_byte_size
+ .byte 14 # Abbrev [14] 0xd4:0x5 DW_TAG_pointer_type
+ .long 217 # DW_AT_type
+ .byte 14 # Abbrev [14] 0xd9:0x5 DW_TAG_pointer_type
+ .long 71 # DW_AT_type
+ .byte 0 # End Of Children Mark
+.Ldebug_info_end0:
+ .section .debug_str,"MS", at progbits,1
+.Linfo_string0:
+ .asciz "clang version 15.0.7 " # string offset=0
+.Linfo_string1:
+ .asciz "unreachable.c" # string offset=69
+.Linfo_string2:
+ .asciz "." # string offset=83
+.Linfo_string3:
+ .asciz "char" # string offset=85
+.Linfo_string4:
+ .asciz "__ARRAY_SIZE_TYPE__" # string offset=90
+.Linfo_string5:
+ .asciz "foo" # string offset=110
+.Linfo_string6:
+ .asciz "puts" # string offset=114
+.Linfo_string7:
+ .asciz "main" # string offset=119
+.Linfo_string8:
+ .asciz "int" # string offset=124
+.Linfo_string9:
+ .asciz "argc" # string offset=128
+.Linfo_string10:
+ .asciz "argv" # string offset=133
+ .section .debug_line,"", at progbits
+.Lline_table_start0:
diff --git a/bolt/test/X86/dwarf5-deleted-range.s b/bolt/test/X86/dwarf5-deleted-range.s
new file mode 100644
index 000000000000000..241c694ce89b3c6
--- /dev/null
+++ b/bolt/test/X86/dwarf5-deleted-range.s
@@ -0,0 +1,484 @@
+# REQUIRES: system-linux
+
+# RUN: llvm-mc -dwarf-version=5 -filetype=obj -triple x86_64-unknown-linux %s -o %tmain.o
+# RUN: %clang %cflags -no-pie %s -o %t.exe -Wl,-q
+# RUN: llvm-bolt %t.exe -o %t.bolt --update-debug-sections
+# RUN: llvm-dwarfdump --show-children --name=main --debug-info %t.bolt \
+# RUN: | FileCheck %s
+
+# CHECK: DW_TAG_inlined_subroutine
+# CHECK: DW_AT_low_pc
+# CHECK-SAME: 0x0000000000000000
+
+# CHECK: DW_TAG_call_site
+# CHECK: DW_AT_call_return_pc
+# CHECK-SAME: 0x0000000000000000
+
+## Test that llvm-bolt correctly updates DIEs corresponding to deleted code.
+
+# Test case built from the following source using:
+#
+# clang -O2 -g -gdwarf-5 ...
+#
+# Assembly modified with "je" -> "jmp" to introduce unreachable block.
+#
+# extern void puts(const char *);
+#
+# static void foo() {
+# puts("hi");
+# }
+#
+# int main(int argc, char **argv) {
+# if (argc)
+# foo();
+# return 0;
+# }
+
+ .text
+ .file "unreachable.c"
+ .file 0 "." "unreachable.c" md5 0xd268d8460ea246544a440d4d42235947
+ .globl main # -- Begin function main
+ .p2align 4, 0x90
+ .type main, at function
+main: # @main
+.Lfunc_begin0:
+ .loc 0 7 0 # unreachable.c:7:0
+ .cfi_startproc
+# %bb.0:
+ #DEBUG_VALUE: main:argc <- $edi
+ #DEBUG_VALUE: main:argv <- $rsi
+ .loc 0 8 7 prologue_end # unreachable.c:8:7
+ testl %edi, %edi
+.Ltmp0:
+ .loc 0 8 7 is_stmt 0 # unreachable.c:8:7
+ jmp .LBB0_2
+.Ltmp1:
+# %bb.1:
+ #DEBUG_VALUE: main:argc <- $edi
+ #DEBUG_VALUE: main:argv <- $rsi
+ pushq %rax
+ .cfi_def_cfa_offset 16
+.Ltmp2:
+ .loc 0 4 3 is_stmt 1 # unreachable.c:4:3
+ movl $.L.str, %edi
+.Ltmp3:
+ #DEBUG_VALUE: main:argc <- [DW_OP_LLVM_entry_value 1] $edi
+ callq puts
+.Ltmp4:
+ #DEBUG_VALUE: main:argv <- [DW_OP_LLVM_entry_value 1] $rsi
+ .loc 0 0 3 is_stmt 0 # unreachable.c:0:3
+ addq $8, %rsp
+.Ltmp5:
+ .cfi_def_cfa_offset 8
+.LBB0_2:
+ #DEBUG_VALUE: main:argc <- [DW_OP_LLVM_entry_value 1] $edi
+ #DEBUG_VALUE: main:argv <- [DW_OP_LLVM_entry_value 1] $rsi
+ .loc 0 10 3 is_stmt 1 # unreachable.c:10:3
+ xorl %eax, %eax
+ retq
+.Ltmp6:
+.Lfunc_end0:
+ .size main, .Lfunc_end0-main
+ .cfi_endproc
+ # -- End function
+ .type .L.str, at object # @.str
+ .section .rodata.str1.1,"aMS", at progbits,1
+.L.str:
+ .asciz "hi"
+ .size .L.str, 3
+
+ .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 .Lfunc_begin0-.Lfunc_begin0 # starting offset
+ .uleb128 .Ltmp3-.Lfunc_begin0 # ending offset
+ .byte 1 # Loc expr size
+ .byte 85 # super-register DW_OP_reg5
+ .byte 4 # DW_LLE_offset_pair
+ .uleb128 .Ltmp3-.Lfunc_begin0 # starting offset
+ .uleb128 .Lfunc_end0-.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 0 # DW_LLE_end_of_list
+.Ldebug_loc1:
+ .byte 4 # DW_LLE_offset_pair
+ .uleb128 .Lfunc_begin0-.Lfunc_begin0 # starting offset
+ .uleb128 .Ltmp4-.Lfunc_begin0 # ending offset
+ .byte 1 # Loc expr size
+ .byte 84 # DW_OP_reg4
+ .byte 4 # DW_LLE_offset_pair
+ .uleb128 .Ltmp4-.Lfunc_begin0 # starting offset
+ .uleb128 .Lfunc_end0-.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 52 # DW_TAG_variable
+ .byte 0 # DW_CHILDREN_no
+ .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 2 # DW_AT_location
+ .byte 24 # DW_FORM_exprloc
+ .byte 0 # EOM(1)
+ .byte 0 # EOM(2)
+ .byte 3 # 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 4 # 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 11 # DW_FORM_data1
+ .byte 0 # EOM(1)
+ .byte 0 # EOM(2)
+ .byte 5 # 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 6 # Abbreviation Code
+ .byte 36 # DW_TAG_base_type
+ .byte 0 # DW_CHILDREN_no
+ .byte 3 # DW_AT_name
+ .byte 37 # DW_FORM_strx1
+ .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 7 # Abbreviation Code
+ .byte 46 # DW_TAG_subprogram
+ .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 32 # DW_AT_inline
+ .byte 33 # DW_FORM_implicit_const
+ .byte 1
+ .byte 0 # EOM(1)
+ .byte 0 # EOM(2)
+ .byte 8 # 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 39 # DW_AT_prototyped
+ .byte 25 # DW_FORM_flag_present
+ .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 9 # 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 10 # 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 17 # DW_AT_low_pc
+ .byte 27 # DW_FORM_addrx
+ .byte 18 # DW_AT_high_pc
+ .byte 6 # DW_FORM_data4
+ .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 11 # Abbreviation Code
+ .byte 72 # DW_TAG_call_site
+ .byte 0 # DW_CHILDREN_no
+ .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 12 # Abbreviation Code
+ .byte 46 # DW_TAG_subprogram
+ .byte 1 # DW_CHILDREN_yes
+ .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 39 # DW_AT_prototyped
+ .byte 25 # DW_FORM_flag_present
+ .byte 60 # DW_AT_declaration
+ .byte 25 # DW_FORM_flag_present
+ .byte 63 # DW_AT_external
+ .byte 25 # DW_FORM_flag_present
+ .byte 0 # EOM(1)
+ .byte 0 # EOM(2)
+ .byte 13 # Abbreviation Code
+ .byte 5 # DW_TAG_formal_parameter
+ .byte 0 # DW_CHILDREN_no
+ .byte 73 # DW_AT_type
+ .byte 19 # DW_FORM_ref4
+ .byte 0 # EOM(1)
+ .byte 0 # EOM(2)
+ .byte 14 # 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 15 # Abbreviation Code
+ .byte 38 # DW_TAG_const_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:0x95 DW_TAG_compile_unit
+ .byte 0 # DW_AT_producer
+ .short 12 # 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 1 # DW_AT_low_pc
+ .long .Lfunc_end0-.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] 0x27:0xa DW_TAG_variable
+ .long 49 # DW_AT_type
+ .byte 0 # DW_AT_decl_file
+ .byte 4 # DW_AT_decl_line
+ .byte 2 # DW_AT_location
+ .byte 161
+ .byte 0
+ .byte 3 # Abbrev [3] 0x31:0xc DW_TAG_array_type
+ .long 61 # DW_AT_type
+ .byte 4 # Abbrev [4] 0x36:0x6 DW_TAG_subrange_type
+ .long 65 # DW_AT_type
+ .byte 3 # DW_AT_count
+ .byte 0 # End Of Children Mark
+ .byte 5 # Abbrev [5] 0x3d:0x4 DW_TAG_base_type
+ .byte 3 # DW_AT_name
+ .byte 6 # DW_AT_encoding
+ .byte 1 # DW_AT_byte_size
+ .byte 6 # Abbrev [6] 0x41:0x4 DW_TAG_base_type
+ .byte 4 # DW_AT_name
+ .byte 8 # DW_AT_byte_size
+ .byte 7 # DW_AT_encoding
+ .byte 7 # Abbrev [7] 0x45:0x4 DW_TAG_subprogram
+ .byte 5 # DW_AT_name
+ .byte 0 # DW_AT_decl_file
+ .byte 3 # DW_AT_decl_line
+ # DW_AT_inline
+ .byte 8 # Abbrev [8] 0x49:0x35 DW_TAG_subprogram
+ .byte 1 # 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 7 # DW_AT_name
+ .byte 0 # DW_AT_decl_file
+ .byte 7 # DW_AT_decl_line
+ # DW_AT_prototyped
+ .long 146 # DW_AT_type
+ # DW_AT_external
+ .byte 9 # Abbrev [9] 0x58:0x9 DW_TAG_formal_parameter
+ .byte 0 # DW_AT_location
+ .byte 9 # DW_AT_name
+ .byte 0 # DW_AT_decl_file
+ .byte 7 # DW_AT_decl_line
+ .long 146 # DW_AT_type
+ .byte 9 # Abbrev [9] 0x61:0x9 DW_TAG_formal_parameter
+ .byte 1 # DW_AT_location
+ .byte 10 # DW_AT_name
+ .byte 0 # DW_AT_decl_file
+ .byte 7 # DW_AT_decl_line
+ .long 150 # DW_AT_type
+ .byte 10 # Abbrev [10] 0x6a:0xd DW_TAG_inlined_subroutine
+ .long 69 # DW_AT_abstract_origin
+ .byte 2 # DW_AT_low_pc
+ .long .Ltmp5-.Ltmp2 # DW_AT_high_pc
+ .byte 0 # DW_AT_call_file
+ .byte 9 # DW_AT_call_line
+ .byte 5 # DW_AT_call_column
+ .byte 11 # Abbrev [11] 0x77:0x6 DW_TAG_call_site
+ .long 126 # DW_AT_call_origin
+ .byte 3 # DW_AT_call_return_pc
+ .byte 0 # End Of Children Mark
+ .byte 12 # Abbrev [12] 0x7e:0xa DW_TAG_subprogram
+ .byte 6 # DW_AT_name
+ .byte 0 # DW_AT_decl_file
+ .byte 1 # DW_AT_decl_line
+ # DW_AT_prototyped
+ # DW_AT_declaration
+ # DW_AT_external
+ .byte 13 # Abbrev [13] 0x82:0x5 DW_TAG_formal_parameter
+ .long 136 # DW_AT_type
+ .byte 0 # End Of Children Mark
+ .byte 14 # Abbrev [14] 0x88:0x5 DW_TAG_pointer_type
+ .long 141 # DW_AT_type
+ .byte 15 # Abbrev [15] 0x8d:0x5 DW_TAG_const_type
+ .long 61 # DW_AT_type
+ .byte 5 # Abbrev [5] 0x92:0x4 DW_TAG_base_type
+ .byte 8 # DW_AT_name
+ .byte 5 # DW_AT_encoding
+ .byte 4 # DW_AT_byte_size
+ .byte 14 # Abbrev [14] 0x96:0x5 DW_TAG_pointer_type
+ .long 155 # DW_AT_type
+ .byte 14 # Abbrev [14] 0x9b:0x5 DW_TAG_pointer_type
+ .long 61 # DW_AT_type
+ .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 15.0.7 " # string offset=0
+.Linfo_string1:
+ .asciz "unreachable.c" # string offset=69
+.Linfo_string2:
+ .asciz "." # string offset=83
+.Linfo_string3:
+ .asciz "char" # string offset=85
+.Linfo_string4:
+ .asciz "__ARRAY_SIZE_TYPE__" # string offset=90
+.Linfo_string5:
+ .asciz "foo" # string offset=110
+.Linfo_string6:
+ .asciz "puts" # string offset=114
+.Linfo_string7:
+ .asciz "main" # string offset=119
+.Linfo_string8:
+ .asciz "int" # string offset=124
+.Linfo_string9:
+ .asciz "argc" # string offset=128
+.Linfo_string10:
+ .asciz "argv" # string offset=133
+ .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 .L.str
+ .quad .Lfunc_begin0
+ .quad .Ltmp2
+ .quad .Ltmp4
+.Ldebug_addr_end0:
+ .section .debug_line,"", at progbits
+.Lline_table_start0:
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