[BOLT][DWARF] Always use new low_pc for exprloc

[ayermolo]

Summary

Changed to creating a new index all the time. This code was legacy of when we
couldn't change the size of .debug_info, and led to subtle bugs where index for
new entries was pointing to a wrong address.

[Amir]

LGTM sans nits.

bolt/lib/Rewrite/DWARFRewriter.cpp

1135–1136

Drop

1153

Is it correct to drop this else? I.e. for all non-DW_OP_{,GNU_}addrx forms is it ok to skip them?
Looks like yes as the other forms are copied above.

[ayermolo]

bolt/lib/Rewrite/DWARFRewriter.cpp

1153

Yes. Previously we copied old data, and then added existing index in to AddressTable. Now we create a new entry.

[ayermolo]

addressed comments

bolt/lib/Rewrite/DWARFRewriter.cpp

default: {
               }
 
               const uint64_t Index = Expr.getRawOperand(0);
               std::optional<object::SectionedAddress> EntryAddress =
                   Unit.getAddrOffsetSectionItem(Index);
               assert(EntryAddress && "Address is not found.");
               assert(Index <= std::numeric_limits<uint32_t>::max() &&
                      "Invalid Operand Index.");
-              if (Expr.getCode() == dwarf::DW_OP_addrx) {
+              if (Expr.getCode() == dwarf::DW_OP_addrx ||
+                  Expr.getCode() == dwarf::DW_OP_GNU_addr_index) {
                 const uint32_t Index = AddrWriter->getIndexFromAddress(
                     EntryAddress->Address, Unit);
                 // update Index for DW_AT_location. The Size field is not stored
                 // in IR, we need to minus 1 in offset for each expr.
                 SmallString<8> Tmp;
                 raw_svector_ostream OSE(Tmp);
                 encodeULEB128(Index, OSE);
 
                 DIEBldr.addValue(NewAttr, static_cast<dwarf::Attribute>(0),
                                  dwarf::DW_FORM_data1,
-                                 DIEInteger(dwarf::DW_OP_addrx));
+                                 DIEInteger(Expr.getCode()));
                 NewExprSize += 1;
                 for (uint8_t Byte : Tmp) {
                   DIEBldr.addValue(NewAttr, static_cast<dwarf::Attribute>(0),
                                    dwarf::DW_FORM_data1, DIEInteger(Byte));
                   NewExprSize += 1;
                 }
-              } else {
-                // TODO: Re-do this as DWARF5.
-                auto Itr = AttrLocValList->values().begin();
-                std::advance(Itr, PrevOffset);
-                uint32_t CopyNum = CurEndOffset - PrevOffset;
-                NewExprSize += CopyNum;
-                while (CopyNum--) {
-                  DIEBldr.addValue(NewAttr, *Itr);
-                  std::advance(Itr, 1);
-                }
-                AddrWriter->addIndexAddress(EntryAddress->Address,
-                                            static_cast<uint32_t>(Index), Unit);
               }
               PrevOffset = CurEndOffset;
             }
 
             // update the size since the index might be changed
             if (Loc)
               Loc->setSize(NewExprSize);
             else

bolt/test/X86/Inputs/dwarf4-df-change-in-dw-op-gnu-addr-index-main.s

+# clang++ -O2 -g -gdwarf-4 -gsplit-dwarf main.cpp
+# void use(int * x, int * y) {
+#  static int Foo = *y + *x;
+#  *x += 4;
+#  *y -= Foo;
+# }
+#
+# int x = 0;
+# int y = 1;
+# int  main(int argc, char *argv[]) {
+#    x = argc;
+#    y = argc + 3;
+#    use(&x, &y);
+#    return 0;
+# }
+
+  .text
+  .file "main.cpp"
+  .file 1 "." "main.cpp"
+  .globl  _Z3usePiS_                      # -- Begin function _Z3usePiS_
+  .p2align  4, 0x90
+  .type _Z3usePiS_,@function
+_Z3usePiS_:                             # @_Z3usePiS_
+.Lfunc_begin0:
+  .loc  1 1 0                           # main.cpp:1:0
+  .cfi_startproc
+# %bb.0:                                # %entry
+  #DEBUG_VALUE: use:x <- $rdi
+  #DEBUG_VALUE: use:y <- $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
+  movq  %rsi, %rbx
+  movq  %rdi, %r14
+.Ltmp0:
+  .loc  1 2 2 prologue_end              # main.cpp:2:2
+  movzbl  _ZGVZ3usePiS_E3Foo(%rip), %eax
+  testb %al, %al
+  je  .LBB0_1
+.Ltmp1:
+.LBB0_3:                                # %init.end
+  #DEBUG_VALUE: use:x <- $r14
+  #DEBUG_VALUE: use:y <- $rbx
+  .loc  1 3 5                           # main.cpp:3:5
+  addl  $4, (%r14)
+  .loc  1 4 8                           # main.cpp:4:8
+  movl  _ZZ3usePiS_E3Foo(%rip), %eax
+  .loc  1 4 5 is_stmt 0                 # main.cpp:4:5
+  subl  %eax, (%rbx)
+  .loc  1 5 1 epilogue_begin is_stmt 1  # main.cpp:5:1
+  addq  $8, %rsp
+  .cfi_def_cfa_offset 24
+  popq  %rbx
+.Ltmp2:
+  #DEBUG_VALUE: use:y <- [DW_OP_LLVM_entry_value 1] $rsi
+  .cfi_def_cfa_offset 16
+  popq  %r14
+.Ltmp3:
+  #DEBUG_VALUE: use:x <- [DW_OP_LLVM_entry_value 1] $rdi
+  .cfi_def_cfa_offset 8
+  retq
+.Ltmp4:
+.LBB0_1:                                # %init.check
+  .cfi_def_cfa_offset 32
+  #DEBUG_VALUE: use:x <- $r14
+  #DEBUG_VALUE: use:y <- $rbx
+  .loc  1 2 2                           # main.cpp:2:2
+  leaq  _ZGVZ3usePiS_E3Foo(%rip), %rdi
+  callq __cxa_guard_acquire@PLT
+.Ltmp5:
+  testl %eax, %eax
+  je  .LBB0_3
+.Ltmp6:
+# %bb.2:                                # %init
+  #DEBUG_VALUE: use:x <- $r14
+  #DEBUG_VALUE: use:y <- $rbx
+  .loc  1 2 24 is_stmt 0                # main.cpp:2:24
+  movl  (%r14), %eax
+  .loc  1 2 22                          # main.cpp:2:22
+  addl  (%rbx), %eax
+  .loc  1 2 2                           # main.cpp:2:2
+  movl  %eax, _ZZ3usePiS_E3Foo(%rip)
+  leaq  _ZGVZ3usePiS_E3Foo(%rip), %rdi
+  callq __cxa_guard_release@PLT
+.Ltmp7:
+  .loc  1 0 2                           # main.cpp:0:2
+  jmp .LBB0_3
+.Ltmp8:
+.Lfunc_end0:
+  .size _Z3usePiS_, .Lfunc_end0-_Z3usePiS_
+  .cfi_endproc
+                                        # -- End function
+  .globl  main                            # -- Begin function main
+  .p2align  4, 0x90
+  .type main,@function
+main:                                   # @main
+.Lfunc_begin1:
+  .cfi_startproc
+# %bb.0:                                # %entry
+  #DEBUG_VALUE: main:argc <- $edi
+  #DEBUG_VALUE: main:argv <- $rsi
+  .loc  1 10 6 prologue_end is_stmt 1   # main.cpp:10:6
+  movl  %edi, x(%rip)
+  .loc  1 11 13                         # main.cpp:11:13
+  addl  $3, %edi
+.Ltmp9:
+  #DEBUG_VALUE: main:argc <- [DW_OP_LLVM_entry_value 1] $edi
+  .loc  1 11 6 is_stmt 0                # main.cpp:11:6
+  movl  %edi, y(%rip)
+.Ltmp10:
+  #DEBUG_VALUE: use:y <- undef
+  #DEBUG_VALUE: use:x <- undef
+  .loc  1 2 2 is_stmt 1                 # main.cpp:2:2
+  movzbl  _ZGVZ3usePiS_E3Foo(%rip), %eax
+  testb %al, %al
+  je  .LBB1_1
+.Ltmp11:
+.LBB1_4:                                # %_Z3usePiS_.exit
+  #DEBUG_VALUE: main:argc <- [DW_OP_LLVM_entry_value 1] $edi
+  #DEBUG_VALUE: main:argv <- [DW_OP_LLVM_entry_value 1] $rsi
+  .loc  1 3 5                           # main.cpp:3:5
+  addl  $4, x(%rip)
+  .loc  1 4 8                           # main.cpp:4:8
+  movl  _ZZ3usePiS_E3Foo(%rip), %eax
+  .loc  1 4 5 is_stmt 0                 # main.cpp:4:5
+  subl  %eax, y(%rip)
+.Ltmp12:
+  .loc  1 13 4 is_stmt 1                # main.cpp:13:4
+  xorl  %eax, %eax
+  retq
+.Ltmp13:
+.LBB1_1:                                # %init.check.i
+  #DEBUG_VALUE: main:argc <- [DW_OP_LLVM_entry_value 1] $edi
+  #DEBUG_VALUE: main:argv <- $rsi
+  pushq %rax
+  .cfi_def_cfa_offset 16
+.Ltmp14:
+  .loc  1 2 2                           # main.cpp:2:2
+  leaq  _ZGVZ3usePiS_E3Foo(%rip), %rdi
+  callq __cxa_guard_acquire@PLT
+.Ltmp15:
+  #DEBUG_VALUE: main:argv <- [DW_OP_LLVM_entry_value 1] $rsi
+  testl %eax, %eax
+  je  .LBB1_3
+.Ltmp16:
+# %bb.2:                                # %init.i
+  #DEBUG_VALUE: main:argc <- [DW_OP_LLVM_entry_value 1] $edi
+  #DEBUG_VALUE: main:argv <- [DW_OP_LLVM_entry_value 1] $rsi
+  .loc  1 2 24 is_stmt 0                # main.cpp:2:24
+  movl  x(%rip), %eax
+  .loc  1 2 22                          # main.cpp:2:22
+  addl  y(%rip), %eax
+  .loc  1 2 2                           # main.cpp:2:2
+  movl  %eax, _ZZ3usePiS_E3Foo(%rip)
+  leaq  _ZGVZ3usePiS_E3Foo(%rip), %rdi
+  callq __cxa_guard_release@PLT
+.Ltmp17:
+.LBB1_3:
+  #DEBUG_VALUE: main:argc <- [DW_OP_LLVM_entry_value 1] $edi
+  #DEBUG_VALUE: main:argv <- [DW_OP_LLVM_entry_value 1] $rsi
+  .loc  1 0 2                           # main.cpp:0:2
+  addq  $8, %rsp
+  .cfi_def_cfa_offset 8
+  jmp .LBB1_4
+.Lfunc_end1:
+  .size main, .Lfunc_end1-main
+  .cfi_endproc
+                                        # -- End function
+  .type _ZZ3usePiS_E3Foo,@object        # @_ZZ3usePiS_E3Foo
+  .local  _ZZ3usePiS_E3Foo
+  .comm _ZZ3usePiS_E3Foo,4,4
+  .type _ZGVZ3usePiS_E3Foo,@object      # @_ZGVZ3usePiS_E3Foo
+  .local  _ZGVZ3usePiS_E3Foo
+  .comm _ZGVZ3usePiS_E3Foo,8,8
+  .type x,@object                       # @x
+  .bss
+  .globl  x
+  .p2align  2, 0x0
+x:
+  .long 0                               # 0x0
+  .size x, 4
+
+  .type y,@object                       # @y
+  .data
+  .globl  y
+  .p2align  2, 0x0
+y:
+  .long 1                               # 0x1
+  .size y, 4
+
+  .section  .debug_loc.dwo,"e",@progbits
+.Ldebug_loc0:
+  .byte 3
+  .byte 3
+  .long .Ltmp1-.Lfunc_begin0
+  .short  1                               # Loc expr size
+  .byte 85                              # DW_OP_reg5
+  .byte 3
+  .byte 5
+  .long .Ltmp3-.Ltmp1
+  .short  1                               # Loc expr size
+  .byte 94                              # DW_OP_reg14
+  .byte 3
+  .byte 6
+  .long .Ltmp4-.Ltmp3
+  .short  4                               # Loc expr size
+  .byte 243                             # DW_OP_GNU_entry_value
+  .byte 1                               # 1
+  .byte 85                              # DW_OP_reg5
+  .byte 159                             # DW_OP_stack_value
+  .byte 3
+  .byte 7
+  .long .Lfunc_end0-.Ltmp4
+  .short  1                               # Loc expr size
+  .byte 94                              # DW_OP_reg14
+  .byte 0
+.Ldebug_loc1:
+  .byte 3
+  .byte 3
+  .long .Ltmp1-.Lfunc_begin0
+  .short  1                               # Loc expr size
+  .byte 84                              # DW_OP_reg4
+  .byte 3
+  .byte 5
+  .long .Ltmp2-.Ltmp1
+  .short  1                               # Loc expr size
+  .byte 83                              # DW_OP_reg3
+  .byte 3
+  .byte 8
+  .long .Ltmp4-.Ltmp2
+  .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
+  .byte 3
+  .byte 7
+  .long .Lfunc_end0-.Ltmp4
+  .short  1                               # Loc expr size
+  .byte 83                              # DW_OP_reg3
+  .byte 0
+.Ldebug_loc2:
+  .byte 3
+  .byte 4
+  .long .Ltmp9-.Lfunc_begin1
+  .short  1                               # Loc expr size
+  .byte 85                              # super-register DW_OP_reg5
+  .byte 3
+  .byte 9
+  .long .Lfunc_end1-.Ltmp9
+  .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
+  .byte 0
+.Ldebug_loc3:
+  .byte 3
+  .byte 4
+  .long .Ltmp11-.Lfunc_begin1
+  .short  1                               # Loc expr size
+  .byte 84                              # DW_OP_reg4
+  .byte 3
+  .byte 10
+  .long .Ltmp13-.Ltmp11
+  .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
+  .byte 3
+  .byte 11
+  .long .Ltmp15-.Ltmp13
+  .short  1                               # Loc expr size
+  .byte 84                              # DW_OP_reg4
+  .byte 3
+  .byte 12
+  .long .Lfunc_end1-.Ltmp15
+  .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
+  .byte 0
+  .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  "\262B"                         # DW_AT_GNU_ranges_base
+  .byte 23                              # DW_FORM_sec_offset
+  .byte 17                              # DW_AT_low_pc
+  .byte 1                               # DW_FORM_addr
+  .byte 18                              # DW_AT_high_pc
+  .byte 6                               # DW_FORM_data4
+  .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:0x29 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 -3506999759942021708            # DW_AT_GNU_dwo_id
+  .long .debug_ranges                   # DW_AT_GNU_ranges_base
+  .quad .Lfunc_begin0                   # DW_AT_low_pc
+  .long .Lfunc_end1-.Lfunc_begin0       # DW_AT_high_pc
+  .long .Laddr_table_base0              # DW_AT_GNU_addr_base
+.Ldebug_info_end0:
+  .section  .debug_ranges,"",@progbits
+.Ldebug_ranges0:
+  .quad .Ltmp10-.Lfunc_begin0
+  .quad .Ltmp12-.Lfunc_begin0
+  .quad .Ltmp14-.Lfunc_begin0
+  .quad .Ltmp17-.Lfunc_begin0
+  .quad 0
+  .quad 0
+  .section  .debug_str,"MS",@progbits,1
+.Lskel_string0:
+  .asciz  "." # string offset=0
+.Lskel_string1:
+  .asciz  "main.dwo"                      # string offset=38
+  .section  .debug_str.dwo,"eMS",@progbits,1
+.Linfo_string0:
+  .asciz  "Foo"                           # string offset=0
+.Linfo_string1:
+  .asciz  "int"                           # string offset=4
+.Linfo_string2:
+  .asciz  "x"                             # string offset=8
+.Linfo_string3:
+  .asciz  "y"                             # string offset=10
+.Linfo_string4:
+  .asciz  "_Z3usePiS_"                    # string offset=12
+.Linfo_string5:
+  .asciz  "use"                           # string offset=23
+.Linfo_string6:
+  .asciz  "main"                          # string offset=27
+.Linfo_string7:
+  .asciz  "argc"                          # string offset=32
+.Linfo_string8:
+  .asciz  "argv"                          # string offset=37
+.Linfo_string9:
+  .asciz  "char"                          # string offset=42
+.Linfo_string10:
+  .asciz  "clang version 18.0.0 ([e-mail]:llvm/llvm-project.git 3a8db0f4bfb57348f49d9603119fa157114bbf8e)" # string offset=47
+.Linfo_string11:
+  .asciz  "main.cpp"                      # string offset=148
+.Linfo_string12:
+  .asciz  "main.dwo"                      # string offset=157
+  .section  .debug_str_offsets.dwo,"e",@progbits
+  .long 0
+  .long 4
+  .long 8
+  .long 10
+  .long 12
+  .long 23
+  .long 27
+  .long 32
+  .long 37
+  .long 42
+  .long 47
+  .long 148
+  .long 157
+  .section  .debug_info.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)
+  .byte 1                               # Abbrev [1] 0xb:0xb1 DW_TAG_compile_unit
+  .byte 10                              # DW_AT_producer
+  .short  33                              # DW_AT_language
+  .byte 11                              # DW_AT_name
+  .byte 12                              # DW_AT_GNU_dwo_name
+  .quad -3506999759942021708            # DW_AT_GNU_dwo_id
+  .byte 2                               # Abbrev [2] 0x19:0x2a DW_TAG_subprogram
+  .byte 3                               # 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 93                              # DW_AT_abstract_origin
+  .byte 3                               # Abbrev [3] 0x25:0xb DW_TAG_variable
+  .byte 0                               # DW_AT_name
+  .long 67                              # DW_AT_type
+  .byte 1                               # DW_AT_decl_file
+  .byte 2                               # DW_AT_decl_line
+  .byte 2                               # DW_AT_location
+  .byte 251
+  .byte 0
+  .byte 4                               # Abbrev [4] 0x30:0x9 DW_TAG_formal_parameter
+  .long .Ldebug_loc0-.debug_loc.dwo     # DW_AT_location
+  .long 99                              # DW_AT_abstract_origin
+  .byte 4                               # Abbrev [4] 0x39:0x9 DW_TAG_formal_parameter
+  .long .Ldebug_loc1-.debug_loc.dwo     # DW_AT_location
+  .long 107                             # DW_AT_abstract_origin
+  .byte 0                               # End Of Children Mark
+  .byte 5                               # Abbrev [5] 0x43:0x4 DW_TAG_base_type
+  .byte 1                               # DW_AT_name
+  .byte 5                               # DW_AT_encoding
+  .byte 4                               # DW_AT_byte_size
+  .byte 6                               # Abbrev [6] 0x47:0xb DW_TAG_variable
+  .byte 2                               # DW_AT_name
+  .long 67                              # DW_AT_type
+                                        # DW_AT_external
+  .byte 1                               # DW_AT_decl_file
+  .byte 7                               # DW_AT_decl_line
+  .byte 2                               # DW_AT_location
+  .byte 251
+  .byte 1
+  .byte 6                               # Abbrev [6] 0x52:0xb DW_TAG_variable
+  .byte 3                               # DW_AT_name
+  .long 67                              # DW_AT_type
+                                        # DW_AT_external
+  .byte 1                               # DW_AT_decl_file
+  .byte 8                               # DW_AT_decl_line
+  .byte 2                               # DW_AT_location
+  .byte 251
+  .byte 2
+  .byte 7                               # Abbrev [7] 0x5d:0x17 DW_TAG_subprogram
+  .byte 4                               # DW_AT_linkage_name
+  .byte 5                               # DW_AT_name
+  .byte 1                               # DW_AT_decl_file
+  .byte 1                               # DW_AT_decl_line
+                                        # DW_AT_external
+  .byte 1                               # DW_AT_inline
+  .byte 8                               # Abbrev [8] 0x63:0x8 DW_TAG_formal_parameter
+  .byte 2                               # DW_AT_name
+  .byte 1                               # DW_AT_decl_file
+  .byte 1                               # DW_AT_decl_line
+  .long 116                             # DW_AT_type
+  .byte 8                               # Abbrev [8] 0x6b:0x8 DW_TAG_formal_parameter
+  .byte 3                               # DW_AT_name
+  .byte 1                               # DW_AT_decl_file
+  .byte 1                               # DW_AT_decl_line
+  .long 116                             # DW_AT_type
+  .byte 0                               # End Of Children Mark
+  .byte 9                               # Abbrev [9] 0x74:0x5 DW_TAG_pointer_type
+  .long 67                              # DW_AT_type
+  .byte 10                              # Abbrev [10] 0x79:0x34 DW_TAG_subprogram
+  .byte 4                               # DW_AT_low_pc
+  .long .Lfunc_end1-.Lfunc_begin1       # DW_AT_high_pc
+  .byte 1                               # DW_AT_frame_base
+  .byte 87
+                                        # DW_AT_GNU_all_call_sites
+  .byte 6                               # DW_AT_name
+  .byte 1                               # DW_AT_decl_file
+  .byte 9                               # DW_AT_decl_line
+  .long 67                              # DW_AT_type
+                                        # DW_AT_external
+  .byte 11                              # Abbrev [11] 0x88:0xc DW_TAG_formal_parameter
+  .long .Ldebug_loc2-.debug_loc.dwo     # DW_AT_location
+  .byte 7                               # DW_AT_name
+  .byte 1                               # DW_AT_decl_file
+  .byte 9                               # DW_AT_decl_line
+  .long 67                              # DW_AT_type
+  .byte 11                              # Abbrev [11] 0x94:0xc DW_TAG_formal_parameter
+  .long .Ldebug_loc3-.debug_loc.dwo     # DW_AT_location
+  .byte 8                               # DW_AT_name
+  .byte 1                               # DW_AT_decl_file
+  .byte 9                               # DW_AT_decl_line
+  .long 173                             # DW_AT_type
+  .byte 12                              # Abbrev [12] 0xa0:0xc DW_TAG_inlined_subroutine
+  .long 93                              # DW_AT_abstract_origin
+  .long .Ldebug_ranges0-.debug_ranges   # DW_AT_ranges
+  .byte 1                               # DW_AT_call_file
+  .byte 12                              # DW_AT_call_line
+  .byte 4                               # DW_AT_call_column
+  .byte 0                               # End Of Children Mark
+  .byte 9                               # Abbrev [9] 0xad:0x5 DW_TAG_pointer_type
+  .long 178                             # DW_AT_type
+  .byte 9                               # Abbrev [9] 0xb2:0x5 DW_TAG_pointer_type
+  .long 183                             # DW_AT_type
+  .byte 5                               # Abbrev [5] 0xb7:0x4 DW_TAG_base_type
+  .byte 9                               # 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",@progbits
+  .byte 1                               # 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 2                               # Abbreviation Code
+  .byte 46                              # DW_TAG_subprogram
+  .byte 1                               # DW_CHILDREN_yes
+  .byte 17                              # DW_AT_low_pc
+  .ascii  "\201>"                         # DW_FORM_GNU_addr_index
+  .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 49                              # DW_AT_abstract_origin
+  .byte 19                              # DW_FORM_ref4
+  .byte 0                               # EOM(1)
+  .byte 0                               # EOM(2)
+  .byte 3                               # 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 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 4                               # 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 49                              # DW_AT_abstract_origin
+  .byte 19                              # DW_FORM_ref4
+  .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
+  .ascii  "\202>"                         # DW_FORM_GNU_str_index
+  .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 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 7                               # Abbreviation Code
+  .byte 46                              # DW_TAG_subprogram
+  .byte 1                               # DW_CHILDREN_yes
+  .byte 110                             # DW_AT_linkage_name
+  .ascii  "\202>"                         # DW_FORM_GNU_str_index
+  .byte 3                               # DW_AT_name
+  .ascii  "\202>"                         # DW_FORM_GNU_str_index
+  .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 32                              # DW_AT_inline
+  .byte 11                              # DW_FORM_data1
+  .byte 0                               # EOM(1)
+  .byte 0                               # EOM(2)
+  .byte 8                               # Abbreviation Code
+  .byte 5                               # DW_TAG_formal_parameter
+  .byte 0                               # DW_CHILDREN_no
+  .byte 3                               # DW_AT_name
+  .ascii  "\202>"                         # DW_FORM_GNU_str_index
+  .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 9                               # 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 10                              # Abbreviation Code
+  .byte 46                              # DW_TAG_subprogram
+  .byte 1                               # DW_CHILDREN_yes
+  .byte 17                              # DW_AT_low_pc
+  .ascii  "\201>"                         # DW_FORM_GNU_addr_index
+  .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
+  .ascii  "\202>"                         # DW_FORM_GNU_str_index
+  .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 11                              # 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
+  .ascii  "\202>"                         # DW_FORM_GNU_str_index
+  .byte 58                              # DW_AT_decl_file
+  .byte 11                              # DW_FORM_data1
+  .byte 59                              # DW_AT_decl_line
+  .byte 11                              # DW_FORM_data1
+  .byte 73                              # DW_AT_type
+  .byte 19                              # DW_FORM_ref4
+  .byte 0                               # EOM(1)
+  .byte 0                               # EOM(2)
+  .byte 12                              # Abbreviation Code
+  .byte 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 23                              # DW_FORM_sec_offset
+  .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 0                               # EOM(3)
+  .section  .debug_addr,"",@progbits
+.Laddr_table_base0:
+  .quad _ZZ3usePiS_E3Foo
+  .quad x
+  .quad y
+  .quad .Lfunc_begin0
+  .quad .Lfunc_begin1
+  .quad .Ltmp1
+  .quad .Ltmp3
+  .quad .Ltmp4
+  .quad .Ltmp2
+  .quad .Ltmp9
+  .quad .Ltmp11
+  .quad .Ltmp13
+  .quad .Ltmp15
+  .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 52                              # Compilation Unit Length
+  .long 37                              # DIE offset
+  .byte 160                             # Attributes: VARIABLE, STATIC
+  .asciz  "use::Foo"                      # External Name
+  .long 71                              # DIE offset
+  .byte 32                              # Attributes: VARIABLE, EXTERNAL
+  .asciz  "x"                             # External Name
+  .long 82                              # DIE offset
+  .byte 32                              # Attributes: VARIABLE, EXTERNAL
+  .asciz  "y"                             # External Name
+  .long 93                              # DIE offset
+  .byte 48                              # Attributes: FUNCTION, EXTERNAL
+  .asciz  "use"                           # External Name
+  .long 121                             # DIE offset
+  .byte 48                              # Attributes: FUNCTION, EXTERNAL
+  .asciz  "main"                          # 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 52                              # Compilation Unit Length
+  .long 67                              # DIE offset
+  .byte 144                             # Attributes: TYPE, STATIC
+  .asciz  "int"                           # External Name
+  .long 183                             # DIE offset
+  .byte 144                             # Attributes: TYPE, STATIC
+  .asciz  "char"                          # External Name
+  .long 0                               # End Mark
+.LpubTypes_end0:
+  .ident  "clang version 18.0.0 ([e-mail]:llvm/llvm-project.git 3a8db0f4bfb57348f49d9603119fa157114bbf8e)"
+  .section  ".note.GNU-stack","",@progbits
+  .addrsig
+  .addrsig_sym _ZGVZ3usePiS_E3Foo
+  .section  .debug_line,"",@progbits
+.Lline_table_start0:

bolt/test/X86/Inputs/dwarf5-df-change-in-dw-op-gnu-addr-index-main.s

+# clang++ -O2 -g -gdwarf-5 -gsplit-dwarf main.cpp
+# void use(int * x, int * y) {
+#  static int Foo = *y + *x;
+#  *x += 4;
+#  *y -= Foo;
+# }
+#
+# int x = 0;
+# int y = 1;
+# int  main(int argc, char *argv[]) {
+#    x = argc;
+#    y = argc + 3;
+#    use(&x, &y);
+#    return 0;
+# }
+  .text
+  .file "main.cpp"
+  .file 0 "." "main.cpp" md5 0x4f704c611bdcbf8d7a62eb17d439188e
+  .globl  _Z3usePiS_                      # -- Begin function _Z3usePiS_
+  .p2align  4, 0x90
+  .type _Z3usePiS_,@function
+_Z3usePiS_:                             # @_Z3usePiS_
+.Lfunc_begin0:
+  .loc  0 1 0                           # main.cpp:1:0
+  .cfi_startproc
+# %bb.0:                                # %entry
+  #DEBUG_VALUE: use:x <- $rdi
+  #DEBUG_VALUE: use:y <- $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
+  movq  %rsi, %rbx
+  movq  %rdi, %r14
+.Ltmp0:
+  .loc  0 2 2 prologue_end              # main.cpp:2:2
+  movzbl  _ZGVZ3usePiS_E3Foo(%rip), %eax
+  testb %al, %al
+  je  .LBB0_1
+.Ltmp1:
+.LBB0_3:                                # %init.end
+  #DEBUG_VALUE: use:x <- $r14
+  #DEBUG_VALUE: use:y <- $rbx
+  .loc  0 3 5                           # main.cpp:3:5
+  addl  $4, (%r14)
+  .loc  0 4 8                           # main.cpp:4:8
+  movl  _ZZ3usePiS_E3Foo(%rip), %eax
+  .loc  0 4 5 is_stmt 0                 # main.cpp:4:5
+  subl  %eax, (%rbx)
+  .loc  0 5 1 epilogue_begin is_stmt 1  # main.cpp:5:1
+  addq  $8, %rsp
+  .cfi_def_cfa_offset 24
+  popq  %rbx
+.Ltmp2:
+  #DEBUG_VALUE: use:y <- [DW_OP_LLVM_entry_value 1] $rsi
+  .cfi_def_cfa_offset 16
+  popq  %r14
+.Ltmp3:
+  #DEBUG_VALUE: use:x <- [DW_OP_LLVM_entry_value 1] $rdi
+  .cfi_def_cfa_offset 8
+  retq
+.Ltmp4:
+.LBB0_1:                                # %init.check
+  .cfi_def_cfa_offset 32
+  #DEBUG_VALUE: use:x <- $r14
+  #DEBUG_VALUE: use:y <- $rbx
+  .loc  0 2 2                           # main.cpp:2:2
+  leaq  _ZGVZ3usePiS_E3Foo(%rip), %rdi
+  callq __cxa_guard_acquire@PLT
+.Ltmp5:
+  testl %eax, %eax
+  je  .LBB0_3
+.Ltmp6:
+# %bb.2:                                # %init
+  #DEBUG_VALUE: use:x <- $r14
+  #DEBUG_VALUE: use:y <- $rbx
+  .loc  0 2 24 is_stmt 0                # main.cpp:2:24
+  movl  (%r14), %eax
+  .loc  0 2 22                          # main.cpp:2:22
+  addl  (%rbx), %eax
+  .loc  0 2 2                           # main.cpp:2:2
+  movl  %eax, _ZZ3usePiS_E3Foo(%rip)
+  leaq  _ZGVZ3usePiS_E3Foo(%rip), %rdi
+  callq __cxa_guard_release@PLT
+.Ltmp7:
+  .loc  0 0 2                           # main.cpp:0:2
+  jmp .LBB0_3
+.Ltmp8:
+.Lfunc_end0:
+  .size _Z3usePiS_, .Lfunc_end0-_Z3usePiS_
+  .cfi_endproc
+                                        # -- End function
+  .globl  main                            # -- Begin function main
+  .p2align  4, 0x90
+  .type main,@function
+main:                                   # @main
+.Lfunc_begin1:
+  .cfi_startproc
+# %bb.0:                                # %entry
+  #DEBUG_VALUE: main:argc <- $edi
+  #DEBUG_VALUE: main:argv <- $rsi
+  .loc  0 10 6 prologue_end is_stmt 1   # main.cpp:10:6
+  movl  %edi, x(%rip)
+  .loc  0 11 13                         # main.cpp:11:13
+  addl  $3, %edi
+.Ltmp9:
+  #DEBUG_VALUE: main:argc <- [DW_OP_LLVM_entry_value 1] $edi
+  .loc  0 11 6 is_stmt 0                # main.cpp:11:6
+  movl  %edi, y(%rip)
+.Ltmp10:
+  #DEBUG_VALUE: use:y <- undef
+  #DEBUG_VALUE: use:x <- undef
+  .loc  0 2 2 is_stmt 1                 # main.cpp:2:2
+  movzbl  _ZGVZ3usePiS_E3Foo(%rip), %eax
+  testb %al, %al
+  je  .LBB1_1
+.Ltmp11:
+.LBB1_4:                                # %_Z3usePiS_.exit
+  #DEBUG_VALUE: main:argc <- [DW_OP_LLVM_entry_value 1] $edi
+  #DEBUG_VALUE: main:argv <- [DW_OP_LLVM_entry_value 1] $rsi
+  .loc  0 3 5                           # main.cpp:3:5
+  addl  $4, x(%rip)
+  .loc  0 4 8                           # main.cpp:4:8
+  movl  _ZZ3usePiS_E3Foo(%rip), %eax
+  .loc  0 4 5 is_stmt 0                 # main.cpp:4:5
+  subl  %eax, y(%rip)
+.Ltmp12:
+  .loc  0 13 4 is_stmt 1                # main.cpp:13:4
+  xorl  %eax, %eax
+  retq
+.Ltmp13:
+.LBB1_1:                                # %init.check.i
+  #DEBUG_VALUE: main:argc <- [DW_OP_LLVM_entry_value 1] $edi
+  #DEBUG_VALUE: main:argv <- $rsi
+  pushq %rax
+  .cfi_def_cfa_offset 16
+.Ltmp14:
+  .loc  0 2 2                           # main.cpp:2:2
+  leaq  _ZGVZ3usePiS_E3Foo(%rip), %rdi
+  callq __cxa_guard_acquire@PLT
+.Ltmp15:
+  #DEBUG_VALUE: main:argv <- [DW_OP_LLVM_entry_value 1] $rsi
+  testl %eax, %eax
+  je  .LBB1_3
+.Ltmp16:
+# %bb.2:                                # %init.i
+  #DEBUG_VALUE: main:argc <- [DW_OP_LLVM_entry_value 1] $edi
+  #DEBUG_VALUE: main:argv <- [DW_OP_LLVM_entry_value 1] $rsi
+  .loc  0 2 24 is_stmt 0                # main.cpp:2:24
+  movl  x(%rip), %eax
+  .loc  0 2 22                          # main.cpp:2:22
+  addl  y(%rip), %eax
+  .loc  0 2 2                           # main.cpp:2:2
+  movl  %eax, _ZZ3usePiS_E3Foo(%rip)
+  leaq  _ZGVZ3usePiS_E3Foo(%rip), %rdi
+  callq __cxa_guard_release@PLT
+.Ltmp17:
+.LBB1_3:
+  #DEBUG_VALUE: main:argc <- [DW_OP_LLVM_entry_value 1] $edi
+  #DEBUG_VALUE: main:argv <- [DW_OP_LLVM_entry_value 1] $rsi
+  .loc  0 0 2                           # main.cpp:0:2
+  addq  $8, %rsp
+  .cfi_def_cfa_offset 8
+  jmp .LBB1_4
+.Lfunc_end1:
+  .size main, .Lfunc_end1-main
+  .cfi_endproc
+                                        # -- End function
+  .type _ZZ3usePiS_E3Foo,@object        # @_ZZ3usePiS_E3Foo
+  .local  _ZZ3usePiS_E3Foo
+  .comm _ZZ3usePiS_E3Foo,4,4
+  .type _ZGVZ3usePiS_E3Foo,@object      # @_ZGVZ3usePiS_E3Foo
+  .local  _ZGVZ3usePiS_E3Foo
+  .comm _ZGVZ3usePiS_E3Foo,8,8
+  .type x,@object                       # @x
+  .bss
+  .globl  x
+  .p2align  2, 0x0
+x:
+  .long 0                               # 0x0
+  .size x, 4
+
+  .type y,@object                       # @y
+  .data
+  .globl  y
+  .p2align  2, 0x0
+y:
+  .long 1                               # 0x1
+  .size y, 4
+
+  .section  .debug_loclists.dwo,"e",@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 4                               # Offset entry count
+.Lloclists_table_base0:
+  .long .Ldebug_loc0-.Lloclists_table_base0
+  .long .Ldebug_loc1-.Lloclists_table_base0
+  .long .Ldebug_loc2-.Lloclists_table_base0
+  .long .Ldebug_loc3-.Lloclists_table_base0
+.Ldebug_loc0:
+  .byte 1                               # DW_LLE_base_addressx
+  .byte 3                               #   base address index
+  .byte 4                               # DW_LLE_offset_pair
+  .uleb128 .Lfunc_begin0-.Lfunc_begin0    #   starting offset
+  .uleb128 .Ltmp1-.Lfunc_begin0           #   ending offset
+  .byte 1                               # Loc expr size
+  .byte 85                              # DW_OP_reg5
+  .byte 4                               # DW_LLE_offset_pair
+  .uleb128 .Ltmp1-.Lfunc_begin0           #   starting offset
+  .uleb128 .Ltmp3-.Lfunc_begin0           #   ending offset
+  .byte 1                               # Loc expr size
+  .byte 94                              # DW_OP_reg14
+  .byte 4                               # DW_LLE_offset_pair
+  .uleb128 .Ltmp3-.Lfunc_begin0           #   starting offset
+  .uleb128 .Ltmp4-.Lfunc_begin0           #   ending offset
+  .byte 4                               # Loc expr size
+  .byte 163                             # DW_OP_entry_value
+  .byte 1                               # 1
+  .byte 85                              # DW_OP_reg5
+  .byte 159                             # DW_OP_stack_value
+  .byte 4                               # DW_LLE_offset_pair
+  .uleb128 .Ltmp4-.Lfunc_begin0           #   starting offset
+  .uleb128 .Lfunc_end0-.Lfunc_begin0      #   ending offset
+  .byte 1                               # Loc expr size
+  .byte 94                              # DW_OP_reg14
+  .byte 0                               # DW_LLE_end_of_list
+.Ldebug_loc1:
+  .byte 1                               # DW_LLE_base_addressx
+  .byte 3                               #   base address index
+  .byte 4                               # DW_LLE_offset_pair
+  .uleb128 .Lfunc_begin0-.Lfunc_begin0    #   starting offset
+  .uleb128 .Ltmp1-.Lfunc_begin0           #   ending offset
+  .byte 1                               # Loc expr size
+  .byte 84                              # DW_OP_reg4
+  .byte 4                               # DW_LLE_offset_pair
+  .uleb128 .Ltmp1-.Lfunc_begin0           #   starting offset
+  .uleb128 .Ltmp2-.Lfunc_begin0           #   ending offset
+  .byte 1                               # Loc expr size
+  .byte 83                              # DW_OP_reg3
+  .byte 4                               # DW_LLE_offset_pair
+  .uleb128 .Ltmp2-.Lfunc_begin0           #   starting offset
+  .uleb128 .Ltmp4-.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 4                               # DW_LLE_offset_pair
+  .uleb128 .Ltmp4-.Lfunc_begin0           #   starting offset
+  .uleb128 .Lfunc_end0-.Lfunc_begin0      #   ending offset
+  .byte 1                               # Loc expr size
+  .byte 83                              # DW_OP_reg3
+  .byte 0                               # DW_LLE_end_of_list
+.Ldebug_loc2:
+  .byte 1                               # DW_LLE_base_addressx
+  .byte 3                               #   base address index
+  .byte 4                               # DW_LLE_offset_pair
+  .uleb128 .Lfunc_begin1-.Lfunc_begin0    #   starting offset
+  .uleb128 .Ltmp9-.Lfunc_begin0           #   ending offset
+  .byte 1                               # Loc expr size
+  .byte 85                              # super-register DW_OP_reg5
+  .byte 4                               # DW_LLE_offset_pair
+  .uleb128 .Ltmp9-.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 0                               # DW_LLE_end_of_list
+.Ldebug_loc3:
+  .byte 1                               # DW_LLE_base_addressx
+  .byte 3                               #   base address index
+  .byte 4                               # DW_LLE_offset_pair
+  .uleb128 .Lfunc_begin1-.Lfunc_begin0    #   starting offset
+  .uleb128 .Ltmp11-.Lfunc_begin0          #   ending offset
+  .byte 1                               # Loc expr size
+  .byte 84                              # DW_OP_reg4
+  .byte 4                               # DW_LLE_offset_pair
+  .uleb128 .Ltmp11-.Lfunc_begin0          #   starting offset
+  .uleb128 .Ltmp13-.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 4                               # DW_LLE_offset_pair
+  .uleb128 .Ltmp13-.Lfunc_begin0          #   starting offset
+  .uleb128 .Ltmp15-.Lfunc_begin0          #   ending offset
+  .byte 1                               # Loc expr size
+  .byte 84                              # DW_OP_reg4
+  .byte 4                               # DW_LLE_offset_pair
+  .uleb128 .Ltmp15-.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,"",@progbits
+  .byte 1                               # Abbreviation Code
+  .byte 74                              # DW_TAG_skeleton_unit
+  .byte 0                               # DW_CHILDREN_no
+  .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 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  5                               # DWARF version number
+  .byte 4                               # DWARF Unit Type
+  .byte 8                               # Address Size (in bytes)
+  .long .debug_abbrev                   # Offset Into Abbrev. Section
+  .quad -3440409667494789237
+  .byte 1                               # Abbrev [1] 0x14:0x14 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 1                               # DW_AT_dwo_name
+  .byte 3                               # DW_AT_low_pc
+  .long .Lfunc_end1-.Lfunc_begin0       # DW_AT_high_pc
+  .long .Laddr_table_base0              # DW_AT_addr_base
+.Ldebug_info_end0:
+  .section  .debug_str_offsets,"",@progbits
+  .long 12                              # Length of String Offsets Set
+  .short  5
+  .short  0
+.Lstr_offsets_base0:
+  .section  .debug_str,"MS",@progbits,1
+.Lskel_string0:
+  .asciz  "." # string offset=0
+.Lskel_string1:
+  .asciz  "main.dwo"                      # string offset=38
+  .section  .debug_str_offsets,"",@progbits
+  .long .Lskel_string0
+  .long .Lskel_string1
+  .section  .debug_str_offsets.dwo,"e",@progbits
+  .long 56                              # Length of String Offsets Set
+  .short  5
+  .short  0
+  .section  .debug_str.dwo,"eMS",@progbits,1
+.Linfo_string0:
+  .asciz  "Foo"                           # string offset=0
+.Linfo_string1:
+  .asciz  "int"                           # string offset=4
+.Linfo_string2:
+  .asciz  "x"                             # string offset=8
+.Linfo_string3:
+  .asciz  "y"                             # string offset=10
+.Linfo_string4:
+  .asciz  "_Z3usePiS_"                    # string offset=12
+.Linfo_string5:
+  .asciz  "use"                           # string offset=23
+.Linfo_string6:
+  .asciz  "main"                          # string offset=27
+.Linfo_string7:
+  .asciz  "argc"                          # string offset=32
+.Linfo_string8:
+  .asciz  "argv"                          # string offset=37
+.Linfo_string9:
+  .asciz  "char"                          # string offset=42
+.Linfo_string10:
+  .asciz  "clang version 18.0.0 ([e-mail]:llvm/llvm-project.git 3a8db0f4bfb57348f49d9603119fa157114bbf8e)" # string offset=47
+.Linfo_string11:
+  .asciz  "main.cpp"                      # string offset=148
+.Linfo_string12:
+  .asciz  "main.dwo"                      # string offset=157
+  .section  .debug_str_offsets.dwo,"e",@progbits
+  .long 0
+  .long 4
+  .long 8
+  .long 10
+  .long 12
+  .long 23
+  .long 27
+  .long 32
+  .long 37
+  .long 42
+  .long 47
+  .long 148
+  .long 157
+  .section  .debug_info.dwo,"e",@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 -3440409667494789237
+  .byte 1                               # Abbrev [1] 0x14:0x95 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:0x24 DW_TAG_subprogram
+  .byte 3                               # 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
+  .long 88                              # DW_AT_abstract_origin
+  .byte 3                               # Abbrev [3] 0x26:0xb DW_TAG_variable
+  .byte 0                               # DW_AT_name
+  .long 62                              # DW_AT_type
+  .byte 0                               # DW_AT_decl_file
+  .byte 2                               # DW_AT_decl_line
+  .byte 2                               # DW_AT_location
+  .byte 161
+  .byte 0
+  .byte 4                               # Abbrev [4] 0x31:0x6 DW_TAG_formal_parameter
+  .byte 0                               # DW_AT_location
+  .long 93                              # DW_AT_abstract_origin
+  .byte 4                               # Abbrev [4] 0x37:0x6 DW_TAG_formal_parameter
+  .byte 1                               # DW_AT_location
+  .long 101                             # DW_AT_abstract_origin
+  .byte 0                               # End Of Children Mark
+  .byte 5                               # Abbrev [5] 0x3e:0x4 DW_TAG_base_type
+  .byte 1                               # DW_AT_name
+  .byte 5                               # DW_AT_encoding
+  .byte 4                               # DW_AT_byte_size
+  .byte 6                               # Abbrev [6] 0x42:0xb DW_TAG_variable
+  .byte 2                               # DW_AT_name
+  .long 62                              # DW_AT_type
+                                        # DW_AT_external
+  .byte 0                               # DW_AT_decl_file
+  .byte 7                               # DW_AT_decl_line
+  .byte 2                               # DW_AT_location
+  .byte 161
+  .byte 1
+  .byte 6                               # Abbrev [6] 0x4d:0xb DW_TAG_variable
+  .byte 3                               # DW_AT_name
+  .long 62                              # DW_AT_type
+                                        # DW_AT_external
+  .byte 0                               # DW_AT_decl_file
+  .byte 8                               # DW_AT_decl_line
+  .byte 2                               # DW_AT_location
+  .byte 161
+  .byte 2
+  .byte 7                               # Abbrev [7] 0x58:0x16 DW_TAG_subprogram
+  .byte 4                               # DW_AT_linkage_name
+  .byte 5                               # DW_AT_name
+  .byte 0                               # DW_AT_decl_file
+  .byte 1                               # DW_AT_decl_line
+                                        # DW_AT_external
+                                        # DW_AT_inline
+  .byte 8                               # Abbrev [8] 0x5d:0x8 DW_TAG_formal_parameter
+  .byte 2                               # DW_AT_name
+  .byte 0                               # DW_AT_decl_file
+  .byte 1                               # DW_AT_decl_line
+  .long 110                             # DW_AT_type
+  .byte 8                               # Abbrev [8] 0x65:0x8 DW_TAG_formal_parameter
+  .byte 3                               # DW_AT_name
+  .byte 0                               # DW_AT_decl_file
+  .byte 1                               # DW_AT_decl_line
+  .long 110                             # DW_AT_type
+  .byte 0                               # End Of Children Mark
+  .byte 9                               # Abbrev [9] 0x6e:0x5 DW_TAG_pointer_type
+  .long 62                              # DW_AT_type
+  .byte 10                              # Abbrev [10] 0x73:0x27 DW_TAG_subprogram
+  .byte 0                               # DW_AT_ranges
+  .byte 1                               # DW_AT_frame_base
+  .byte 87
+                                        # DW_AT_call_all_calls
+  .byte 6                               # DW_AT_name
+  .byte 0                               # DW_AT_decl_file
+  .byte 9                               # DW_AT_decl_line
+  .long 62                              # DW_AT_type
+                                        # DW_AT_external
+  .byte 11                              # Abbrev [11] 0x7e:0x9 DW_TAG_formal_parameter
+  .byte 2                               # DW_AT_location
+  .byte 7                               # DW_AT_name
+  .byte 0                               # DW_AT_decl_file
+  .byte 9                               # DW_AT_decl_line
+  .long 62                              # DW_AT_type
+  .byte 11                              # Abbrev [11] 0x87:0x9 DW_TAG_formal_parameter
+  .byte 3                               # DW_AT_location
+  .byte 8                               # DW_AT_name
+  .byte 0                               # DW_AT_decl_file
+  .byte 9                               # DW_AT_decl_line
+  .long 154                             # DW_AT_type
+  .byte 12                              # Abbrev [12] 0x90:0x9 DW_TAG_inlined_subroutine
+  .long 88                              # DW_AT_abstract_origin
+  .byte 1                               # DW_AT_ranges
+  .byte 0                               # DW_AT_call_file
+  .byte 12                              # DW_AT_call_line
+  .byte 4                               # DW_AT_call_column
+  .byte 0                               # End Of Children Mark
+  .byte 9                               # Abbrev [9] 0x9a:0x5 DW_TAG_pointer_type
+  .long 159                             # DW_AT_type
+  .byte 9                               # Abbrev [9] 0x9f:0x5 DW_TAG_pointer_type
+  .long 164                             # DW_AT_type
+  .byte 5                               # Abbrev [5] 0xa4:0x4 DW_TAG_base_type
+  .byte 9                               # 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",@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 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 49                              # DW_AT_abstract_origin
+  .byte 19                              # DW_FORM_ref4
+  .byte 0                               # EOM(1)
+  .byte 0                               # EOM(2)
+  .byte 3                               # Abbreviation Code
+  .byte 52                              # DW_TAG_variable
+  .byte 0                               # DW_CHILDREN_no
+  .byte 3                               # DW_AT_name
+  .byte 37                              # DW_FORM_strx1
+  .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 4                               # Abbreviation Code
+  .byte 5                               # DW_TAG_formal_parameter
+  .byte 0                               # DW_CHILDREN_no
+  .byte 2                               # DW_AT_location
+  .byte 34                              # DW_FORM_loclistx
+  .byte 49                              # DW_AT_abstract_origin
+  .byte 19                              # DW_FORM_ref4
+  .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 52                              # DW_TAG_variable
+  .byte 0                               # DW_CHILDREN_no
+  .byte 3                               # DW_AT_name
+  .byte 37                              # DW_FORM_strx1
+  .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 7                               # 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 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 8                               # 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 9                               # 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 10                              # Abbreviation Code
+  .byte 46                              # DW_TAG_subprogram
+  .byte 1                               # DW_CHILDREN_yes
+  .byte 85                              # DW_AT_ranges
+  .byte 35                              # DW_FORM_rnglistx
+  .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 11                              # 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 12                              # 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 0                               # EOM(3)
+  .section  .debug_rnglists.dwo,"e",@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 2                               # Offset entry count
+.Lrnglists_dwo_table_base0:
+  .long .Ldebug_ranges0-.Lrnglists_dwo_table_base0
+  .long .Ldebug_ranges1-.Lrnglists_dwo_table_base0
+.Ldebug_ranges0:
+  .byte 4                               # DW_RLE_offset_pair
+  .uleb128 .Lfunc_begin1-.Lfunc_begin0    #   starting offset
+  .uleb128 .Lfunc_end1-.Lfunc_begin0      #   ending offset
+  .byte 0                               # DW_RLE_end_of_list
+.Ldebug_ranges1:
+  .byte 4                               # DW_RLE_offset_pair
+  .uleb128 .Ltmp10-.Lfunc_begin0          #   starting offset
+  .uleb128 .Ltmp12-.Lfunc_begin0          #   ending offset
+  .byte 4                               # DW_RLE_offset_pair
+  .uleb128 .Ltmp14-.Lfunc_begin0          #   starting offset
+  .uleb128 .Ltmp17-.Lfunc_begin0          #   ending offset
+  .byte 0                               # DW_RLE_end_of_list
+.Ldebug_list_header_end1:
+  .section  .debug_addr,"",@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 _ZZ3usePiS_E3Foo
+  .quad x
+  .quad y
+  .quad .Lfunc_begin0
+.Ldebug_addr_end0:
+  .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 40                              # Compilation Unit Length
+  .long 38                              # DIE offset
+  .byte 160                             # Attributes: VARIABLE, STATIC
+  .asciz  "use::Foo"                      # External Name
+  .long 66                              # DIE offset
+  .byte 32                              # Attributes: VARIABLE, EXTERNAL
+  .asciz  "x"                             # External Name
+  .long 77                              # DIE offset
+  .byte 32                              # Attributes: VARIABLE, EXTERNAL
+  .asciz  "y"                             # External Name
+  .long 88                              # DIE offset
+  .byte 48                              # Attributes: FUNCTION, EXTERNAL
+  .asciz  "use"                           # External Name
+  .long 115                             # DIE offset
+  .byte 48                              # Attributes: FUNCTION, EXTERNAL
+  .asciz  "main"                          # 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 40                              # Compilation Unit Length
+  .long 62                              # DIE offset
+  .byte 144                             # Attributes: TYPE, STATIC
+  .asciz  "int"                           # External Name
+  .long 164                             # DIE offset
+  .byte 144                             # Attributes: TYPE, STATIC
+  .asciz  "char"                          # External Name
+  .long 0                               # End Mark
+.LpubTypes_end0:
+  .ident  "clang version 18.0.0 ([e-mail]:llvm/llvm-project.git 3a8db0f4bfb57348f49d9603119fa157114bbf8e)"
+  .section  ".note.GNU-stack","",@progbits
+  .addrsig
+  .addrsig_sym _ZGVZ3usePiS_E3Foo
+  .section  .debug_line,"",@progbits
+.Lline_table_start0:

bolt/test/X86/dwarf4-df-change-in-dw-op-gnu-addr-index-main.test

+; RUN: rm -rf %t
+; RUN: mkdir %t
+; RUN: cd %t
+; RUN: llvm-mc -dwarf-version=4 -filetype=obj -triple x86_64-unknown-linux %p/Inputs/dwarf4-df-change-in-dw-op-gnu-addr-index-main.s \
+; RUN: -split-dwarf-file=main.dwo -o main.o
+; RUN: %clang %cflags -gdwarf-5 -gsplit-dwarf=split main.o -o main.exe
+; RUN: llvm-bolt main.exe -o main.exe.bolt --update-debug-sections
+; RUN: not llvm-dwarfdump --show-form --verbose --debug-info main.dwo &> %t/maindwo.txt
+; RUN: cat %t/maindwo.txt | FileCheck -check-prefix=PRE-BOLT-DWO-MAIN %s
+; RUN: not llvm-dwarfdump --show-form --verbose --debug-info main.dwo.dwo &> %t/maindwodwo.txt
+; RUN: cat %t/maindwodwo.txt | FileCheck -check-prefix=BOLT-DWO-MAIN %s
+
+; Tests that new indices are assigned to DW_OP_GNU_addr_index.
+
+; PRE-BOLT-DWO-MAIN: version = 0x0004
+; PRE-BOLT-DWO-MAIN: DW_AT_location [DW_FORM_exprloc]  (DW_OP_GNU_addr_index 0x0)
+; PRE-BOLT-DWO-MAIN: DW_AT_location [DW_FORM_exprloc]  (DW_OP_GNU_addr_index 0x1)
+; PRE-BOLT-DWO-MAIN: DW_AT_location [DW_FORM_exprloc]  (DW_OP_GNU_addr_index 0x2)
+
+; BOLT-DWO-MAIN: version = 0x0004
+; BOLT-DWO-MAIN: DW_AT_location [DW_FORM_exprloc]  (DW_OP_GNU_addr_index 0x1)
+; BOLT-DWO-MAIN: DW_AT_location [DW_FORM_exprloc]  (DW_OP_GNU_addr_index 0x6)
+; BOLT-DWO-MAIN: DW_AT_location [DW_FORM_exprloc]  (DW_OP_GNU_addr_index 0x7)

bolt/test/X86/dwarf5-df-change-in-dw-op-gnu-addr-index-main.test

+; RUN: rm -rf %t
+; RUN: mkdir %t
+; RUN: cd %t
+; RUN: llvm-mc -dwarf-version=5 -filetype=obj -triple x86_64-unknown-linux %p/Inputs/dwarf5-df-change-in-dw-op-gnu-addr-index-main.s \
+; RUN: -split-dwarf-file=main.dwo -o main.o
+; RUN: %clang %cflags -gdwarf-5 -gsplit-dwarf=split main.o -o main.exe
+; RUN: llvm-bolt main.exe -o main.exe.bolt --update-debug-sections
+; RUN: llvm-dwarfdump --show-form --verbose --debug-info main.dwo &> %t/maindwo.txt
+; RUN: cat %t/maindwo.txt | FileCheck -check-prefix=PRE-BOLT-DWO-MAIN %s
+; RUN: llvm-dwarfdump --show-form --verbose --debug-info main.dwo.dwo &> %t/maindwodwo.txt
+; RUN: cat %t/maindwodwo.txt | FileCheck -check-prefix=BOLT-DWO-MAIN %s
+
+; Tests that new indices are assigned to DW_OP_GNU_addr_index.
+
+; PRE-BOLT-DWO-MAIN: version = 0x0005
+; PRE-BOLT-DWO-MAIN: DW_AT_location [DW_FORM_exprloc]  (DW_OP_addrx 0x0)
+; PRE-BOLT-DWO-MAIN: DW_AT_location [DW_FORM_exprloc]  (DW_OP_addrx 0x1)
+; PRE-BOLT-DWO-MAIN: DW_AT_location [DW_FORM_exprloc]  (DW_OP_addrx 0x2)
+
+; BOLT-DWO-MAIN: version = 0x0005
+; BOLT-DWO-MAIN: DW_AT_location [DW_FORM_exprloc]  (DW_OP_addrx 0x1)
+; BOLT-DWO-MAIN: DW_AT_location [DW_FORM_exprloc]  (DW_OP_addrx 0x2)
+; BOLT-DWO-MAIN: DW_AT_location [DW_FORM_exprloc]  (DW_OP_addrx 0x3)