[BOLT][DWARF] Fix setting DW_AT_ranges offset of Skeleton CU

[ayermolo]

Summary

Fixed a bug where when Skelton CU had DW_AT_ranges, it the output CU DW_AT_ranges
offset was relative, and not absolute.

[maksfb]

LGTM. Please revise the summary before committing.

bolt/lib/Rewrite/DWARFRewriter.cpp

1248

Are you checking DWOId somewhere else? If not, convert to error.

[ayermolo]

bolt/lib/Rewrite/DWARFRewriter.cpp

1248

not in all code paths that can lead to this function execution.

[ayermolo]

addressed comments

[ayermolo]

rebase

[ayermolo]

Restored formating in rest of the file

bolt/lib/Rewrite/DWARFRewriter.cpp

if (RangesAttrInfo) {
     // For DWARF5 converting all of DW_AT_ranges into DW_FORM_rnglistx
     bool NeedConverted = false;
 
     if (Unit.getVersion() >= 5 &&
         RangesAttrInfo.getForm() == dwarf::DW_FORM_sec_offset)
       NeedConverted = true;
 
     uint64_t CurRangeBase = 0;
-    if (std::optional<uint64_t> DWOId = Unit.getDWOId()) {
+    if (Unit.isDWOUnit()) {
+      if (std::optional<uint64_t> DWOId = Unit.getDWOId())
         CurRangeBase = getDwoRangesBase(*DWOId);
+      else
+        errs() << "BOLT-WARNING: [internal-dwarf-error]: DWOId is not found "
+                  "for DWO Unit.";
     }
     if (NeedConverted || RangesAttrInfo.getForm() == dwarf::DW_FORM_rnglistx)
       DIEBldr.replaceValue(&Die, dwarf::DW_AT_ranges, dwarf::DW_FORM_rnglistx,
                            DIEInteger(DebugRangesOffset));
     else
       DIEBldr.replaceValue(&Die, dwarf::DW_AT_ranges, RangesAttrInfo.getForm(),
                            DIEInteger(DebugRangesOffset - CurRangeBase));
 

bolt/test/X86/Inputs/dwarf4-df-input-lowpc-ranges-main.s

+# clang++ -fbasic-block-sections=all -ffunction-sections -g2 -gdwarf-4 -gsplit-dwarf
+# __attribute__((always_inline))
+# int doStuff(int val) {
+#   if (val)
+#     ++val;
+#   return val;
+# }
+# __attribute__((always_inline))
+# int doStuff2(int val) {
+#   int foo = 3;
+#   return val + foo;
+# }
+#
+#
+# int main(int argc, const char** argv) {
+#     return  doStuff(argc) + doStuff2(argc);;
+# }
+
+  .text
+  .file "main.cpp"
+  .section  .text._Z7doStuffi,"ax",@progbits
+  .globl  _Z7doStuffi                     # -- Begin function _Z7doStuffi
+  .p2align  4, 0x90
+  .type _Z7doStuffi,@function
+_Z7doStuffi:                            # @_Z7doStuffi
+.Lfunc_begin0:
+  .file 1 "." "main.cpp"
+  .loc  1 2 0                           # main.cpp:2:0
+  .cfi_startproc
+# %bb.0:                                # %entry
+  pushq %rbp
+  .cfi_def_cfa_offset 16
+  .cfi_offset %rbp, -16
+  movq  %rsp, %rbp
+  .cfi_def_cfa_register %rbp
+  movl  %edi, -4(%rbp)
+.Ltmp0:
+  .loc  1 3 7 prologue_end              # main.cpp:3:7
+  cmpl  $0, -4(%rbp)
+.Ltmp1:
+  .loc  1 3 7 is_stmt 0                 # main.cpp:3:7
+  je  _Z7doStuffi.__part.2
+  jmp _Z7doStuffi.__part.1
+.LBB_END0_0:
+  .cfi_endproc
+  .section  .text._Z7doStuffi,"ax",@progbits,unique,1
+_Z7doStuffi.__part.1:                   # %if.then
+  .cfi_startproc
+  .cfi_def_cfa %rbp, 16
+  .cfi_offset %rbp, -16
+  .loc  1 4 5 is_stmt 1                 # main.cpp:4:5
+  movl  -4(%rbp), %eax
+  addl  $1, %eax
+  movl  %eax, -4(%rbp)
+  jmp _Z7doStuffi.__part.2
+.LBB_END0_1:
+  .size _Z7doStuffi.__part.1, .LBB_END0_1-_Z7doStuffi.__part.1
+  .cfi_endproc
+  .section  .text._Z7doStuffi,"ax",@progbits,unique,2
+_Z7doStuffi.__part.2:                   # %if.end
+  .cfi_startproc
+  .cfi_def_cfa %rbp, 16
+  .cfi_offset %rbp, -16
+  .loc  1 5 10                          # main.cpp:5:10
+  movl  -4(%rbp), %eax
+  .loc  1 5 3 epilogue_begin is_stmt 0  # main.cpp:5:3
+  popq  %rbp
+  .cfi_def_cfa %rsp, 8
+  retq
+.LBB_END0_2:
+  .size _Z7doStuffi.__part.2, .LBB_END0_2-_Z7doStuffi.__part.2
+  .cfi_endproc
+  .section  .text._Z7doStuffi,"ax",@progbits
+.Lfunc_end0:
+  .size _Z7doStuffi, .Lfunc_end0-_Z7doStuffi
+                                        # -- End function
+  .section  .text._Z8doStuff2i,"ax",@progbits
+  .globl  _Z8doStuff2i                    # -- Begin function _Z8doStuff2i
+  .p2align  4, 0x90
+  .type _Z8doStuff2i,@function
+_Z8doStuff2i:                           # @_Z8doStuff2i
+.Lfunc_begin1:
+  .loc  1 8 0 is_stmt 1                 # main.cpp:8:0
+  .cfi_startproc
+# %bb.0:                                # %entry
+  pushq %rbp
+  .cfi_def_cfa_offset 16
+  .cfi_offset %rbp, -16
+  movq  %rsp, %rbp
+  .cfi_def_cfa_register %rbp
+  movl  %edi, -4(%rbp)
+.Ltmp2:
+  .loc  1 9 7 prologue_end              # main.cpp:9:7
+  movl  $3, -8(%rbp)
+  .loc  1 10 10                         # main.cpp:10:10
+  movl  -4(%rbp), %eax
+  .loc  1 10 14 is_stmt 0               # main.cpp:10:14
+  addl  -8(%rbp), %eax
+  .loc  1 10 3 epilogue_begin           # main.cpp:10:3
+  popq  %rbp
+  .cfi_def_cfa %rsp, 8
+  retq
+.LBB_END1_0:
+  .cfi_endproc
+.Lfunc_end1:
+  .size _Z8doStuff2i, .Lfunc_end1-_Z8doStuff2i
+                                        # -- End function
+  .section  .text.main,"ax",@progbits
+  .globl  main                            # -- Begin function main
+  .p2align  4, 0x90
+  .type main,@function
+main:                                   # @main
+.Lfunc_begin2:
+  .loc  1 14 0 is_stmt 1                # main.cpp:14:0
+  .cfi_startproc
+# %bb.0:                                # %entry
+  pushq %rbp
+  .cfi_def_cfa_offset 16
+  .cfi_offset %rbp, -16
+  movq  %rsp, %rbp
+  .cfi_def_cfa_register %rbp
+  movl  $0, -16(%rbp)
+  movl  %edi, -20(%rbp)
+  movq  %rsi, -32(%rbp)
+.Ltmp3:
+  .loc  1 15 21 prologue_end            # main.cpp:15:21
+  movl  -20(%rbp), %eax
+  movl  %eax, -12(%rbp)
+.Ltmp4:
+  .loc  1 3 7                           # main.cpp:3:7
+  cmpl  $0, -12(%rbp)
+.Ltmp5:
+  .loc  1 3 7 is_stmt 0                 # main.cpp:3:7
+  je  main.__part.2
+  jmp main.__part.1
+.LBB_END2_0:
+  .cfi_endproc
+  .section  .text.main,"ax",@progbits,unique,3
+main.__part.1:                          # %if.then.i
+  .cfi_startproc
+  .cfi_def_cfa %rbp, 16
+  .cfi_offset %rbp, -16
+  .loc  1 4 5 is_stmt 1                 # main.cpp:4:5
+  movl  -12(%rbp), %eax
+  addl  $1, %eax
+  movl  %eax, -12(%rbp)
+  jmp main.__part.2
+.LBB_END2_1:
+  .size main.__part.1, .LBB_END2_1-main.__part.1
+  .cfi_endproc
+  .section  .text.main,"ax",@progbits,unique,4
+main.__part.2:                          # %_Z7doStuffi.exit
+  .cfi_startproc
+  .cfi_def_cfa %rbp, 16
+  .cfi_offset %rbp, -16
+  .loc  1 5 10                          # main.cpp:5:10
+  movl  -12(%rbp), %eax
+.Ltmp6:
+  .loc  1 15 38                         # main.cpp:15:38
+  movl  -20(%rbp), %ecx
+  movl  %ecx, -4(%rbp)
+.Ltmp7:
+  .loc  1 9 7                           # main.cpp:9:7
+  movl  $3, -8(%rbp)
+  .loc  1 10 10                         # main.cpp:10:10
+  movl  -4(%rbp), %ecx
+  .loc  1 10 14 is_stmt 0               # main.cpp:10:14
+  addl  -8(%rbp), %ecx
+.Ltmp8:
+  .loc  1 15 27 is_stmt 1               # main.cpp:15:27
+  addl  %ecx, %eax
+  .loc  1 15 5 epilogue_begin is_stmt 0 # main.cpp:15:5
+  popq  %rbp
+  .cfi_def_cfa %rsp, 8
+  retq
+.LBB_END2_2:
+  .size main.__part.2, .LBB_END2_2-main.__part.2
+  .cfi_endproc
+  .section  .text.main,"ax",@progbits
+.Lfunc_end2:
+  .size main, .Lfunc_end2-main
+                                        # -- End function
+  .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 85                              # DW_AT_ranges
+  .byte 23                              # DW_FORM_sec_offset
+  .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 1354107878901449185             # DW_AT_GNU_dwo_id
+  .long .debug_ranges                   # DW_AT_GNU_ranges_base
+  .quad 0                               # DW_AT_low_pc
+  .long .Ldebug_ranges3                 # DW_AT_ranges
+  .long .Laddr_table_base0              # DW_AT_GNU_addr_base
+.Ldebug_info_end0:
+  .section  .debug_ranges,"",@progbits
+.Ldebug_ranges0:
+  .quad _Z7doStuffi.__part.1
+  .quad .LBB_END0_1
+  .quad _Z7doStuffi.__part.2
+  .quad .LBB_END0_2
+  .quad .Lfunc_begin0
+  .quad .Lfunc_end0
+  .quad 0
+  .quad 0
+.Ldebug_ranges1:
+  .quad main.__part.1
+  .quad .LBB_END2_1
+  .quad main.__part.2
+  .quad .LBB_END2_2
+  .quad .Lfunc_begin2
+  .quad .Lfunc_end2
+  .quad 0
+  .quad 0
+.Ldebug_ranges2:
+  .quad .Ltmp4
+  .quad .Lfunc_end2
+  .quad main.__part.1
+  .quad .LBB_END2_1
+  .quad main.__part.2
+  .quad .Ltmp6
+  .quad 0
+  .quad 0
+.Ldebug_ranges3:
+  .quad _Z7doStuffi.__part.1
+  .quad .LBB_END0_1
+  .quad _Z7doStuffi.__part.2
+  .quad .LBB_END0_2
+  .quad .Lfunc_begin0
+  .quad .Lfunc_end0
+  .quad .Lfunc_begin1
+  .quad .Lfunc_end1
+  .quad main.__part.1
+  .quad .LBB_END2_1
+  .quad main.__part.2
+  .quad .LBB_END2_2
+  .quad .Lfunc_begin2
+  .quad .Lfunc_end2
+  .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  "_Z7doStuffi"                   # string offset=0
+.Linfo_string1:
+  .asciz  "doStuff"                       # string offset=12
+.Linfo_string2:
+  .asciz  "int"                           # string offset=20
+.Linfo_string3:
+  .asciz  "val"                           # string offset=24
+.Linfo_string4:
+  .asciz  "_Z8doStuff2i"                  # string offset=28
+.Linfo_string5:
+  .asciz  "doStuff2"                      # string offset=41
+.Linfo_string6:
+  .asciz  "foo"                           # string offset=50
+.Linfo_string7:
+  .asciz  "main"                          # string offset=54
+.Linfo_string8:
+  .asciz  "argc"                          # string offset=59
+.Linfo_string9:
+  .asciz  "argv"                          # string offset=64
+.Linfo_string10:
+  .asciz  "char"                          # string offset=69
+.Linfo_string11:
+  .asciz  "clang version 18.0.0 ([e-mail]:llvm/llvm-project.git 3a8db0f4bfb57348f49d9603119fa157114bbf8e)" # string offset=74
+.Linfo_string12:
+  .asciz  "main.cpp"                      # string offset=175
+.Linfo_string13:
+  .asciz  "main.dwo"                      # string offset=184
+  .section  .debug_str_offsets.dwo,"e",@progbits
+  .long 0
+  .long 12
+  .long 20
+  .long 24
+  .long 28
+  .long 41
+  .long 50
+  .long 54
+  .long 59
+  .long 64
+  .long 69
+  .long 74
+  .long 175
+  .long 184
+  .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:0xdd DW_TAG_compile_unit
+  .byte 11                              # DW_AT_producer
+  .short  33                              # DW_AT_language
+  .byte 12                              # DW_AT_name
+  .byte 13                              # DW_AT_GNU_dwo_name
+  .quad 1354107878901449185             # DW_AT_GNU_dwo_id
+  .byte 2                               # Abbrev [2] 0x19:0x14 DW_TAG_subprogram
+  .long .Ldebug_ranges0-.debug_ranges   # DW_AT_ranges
+  .byte 1                               # DW_AT_frame_base
+  .byte 86
+  .long 74                              # DW_AT_abstract_origin
+  .byte 3                               # Abbrev [3] 0x24:0x8 DW_TAG_formal_parameter
+  .byte 2                               # DW_AT_location
+  .byte 145
+  .byte 124
+  .long 84                              # DW_AT_abstract_origin
+  .byte 0                               # End Of Children Mark
+  .byte 4                               # Abbrev [4] 0x2d:0x1d DW_TAG_subprogram
+  .byte 3                               # DW_AT_low_pc
+  .long .Lfunc_end1-.Lfunc_begin1       # DW_AT_high_pc
+  .byte 1                               # DW_AT_frame_base
+  .byte 86
+  .long 97                              # DW_AT_abstract_origin
+  .byte 3                               # Abbrev [3] 0x39:0x8 DW_TAG_formal_parameter
+  .byte 2                               # DW_AT_location
+  .byte 145
+  .byte 124
+  .long 107                             # DW_AT_abstract_origin
+  .byte 5                               # Abbrev [5] 0x41:0x8 DW_TAG_variable
+  .byte 2                               # DW_AT_location
+  .byte 145
+  .byte 120
+  .long 115                             # DW_AT_abstract_origin
+  .byte 0                               # End Of Children Mark
+  .byte 6                               # Abbrev [6] 0x4a:0x13 DW_TAG_subprogram
+  .byte 0                               # DW_AT_linkage_name
+  .byte 1                               # DW_AT_name
+  .byte 1                               # DW_AT_decl_file
+  .byte 2                               # DW_AT_decl_line
+  .long 93                              # DW_AT_type
+                                        # DW_AT_external
+  .byte 1                               # DW_AT_inline
+  .byte 7                               # Abbrev [7] 0x54:0x8 DW_TAG_formal_parameter
+  .byte 3                               # DW_AT_name
+  .byte 1                               # DW_AT_decl_file
+  .byte 2                               # DW_AT_decl_line
+  .long 93                              # DW_AT_type
+  .byte 0                               # End Of Children Mark
+  .byte 8                               # Abbrev [8] 0x5d:0x4 DW_TAG_base_type
+  .byte 2                               # DW_AT_name
+  .byte 5                               # DW_AT_encoding
+  .byte 4                               # DW_AT_byte_size
+  .byte 6                               # Abbrev [6] 0x61:0x1b DW_TAG_subprogram
+  .byte 4                               # DW_AT_linkage_name
+  .byte 5                               # DW_AT_name
+  .byte 1                               # DW_AT_decl_file
+  .byte 8                               # DW_AT_decl_line
+  .long 93                              # DW_AT_type
+                                        # DW_AT_external
+  .byte 1                               # DW_AT_inline
+  .byte 7                               # Abbrev [7] 0x6b:0x8 DW_TAG_formal_parameter
+  .byte 3                               # DW_AT_name
+  .byte 1                               # DW_AT_decl_file
+  .byte 8                               # DW_AT_decl_line
+  .long 93                              # DW_AT_type
+  .byte 9                               # Abbrev [9] 0x73:0x8 DW_TAG_variable
+  .byte 6                               # DW_AT_name
+  .byte 1                               # DW_AT_decl_file
+  .byte 9                               # DW_AT_decl_line
+  .long 93                              # DW_AT_type
+  .byte 0                               # End Of Children Mark
+  .byte 10                              # Abbrev [10] 0x7c:0x58 DW_TAG_subprogram
+  .long .Ldebug_ranges1-.debug_ranges   # DW_AT_ranges
+  .byte 1                               # DW_AT_frame_base
+  .byte 86
+  .byte 7                               # DW_AT_name
+  .byte 1                               # DW_AT_decl_file
+  .byte 14                              # DW_AT_decl_line
+  .long 93                              # DW_AT_type
+                                        # DW_AT_external
+  .byte 11                              # Abbrev [11] 0x8a:0xb DW_TAG_formal_parameter
+  .byte 2                               # DW_AT_location
+  .byte 145
+  .byte 108
+  .byte 8                               # DW_AT_name
+  .byte 1                               # DW_AT_decl_file
+  .byte 14                              # DW_AT_decl_line
+  .long 93                              # DW_AT_type
+  .byte 11                              # Abbrev [11] 0x95:0xb DW_TAG_formal_parameter
+  .byte 2                               # DW_AT_location
+  .byte 145
+  .byte 96
+  .byte 9                               # DW_AT_name
+  .byte 1                               # DW_AT_decl_file
+  .byte 14                              # DW_AT_decl_line
+  .long 212                             # DW_AT_type
+  .byte 12                              # Abbrev [12] 0xa0:0x15 DW_TAG_inlined_subroutine
+  .long 74                              # DW_AT_abstract_origin
+  .long .Ldebug_ranges2-.debug_ranges   # DW_AT_ranges
+  .byte 1                               # DW_AT_call_file
+  .byte 15                              # DW_AT_call_line
+  .byte 13                              # DW_AT_call_column
+  .byte 3                               # Abbrev [3] 0xac:0x8 DW_TAG_formal_parameter
+  .byte 2                               # DW_AT_location
+  .byte 145
+  .byte 116
+  .long 84                              # DW_AT_abstract_origin
+  .byte 0                               # End Of Children Mark
+  .byte 13                              # Abbrev [13] 0xb5:0x1e DW_TAG_inlined_subroutine
+  .long 97                              # DW_AT_abstract_origin
+  .byte 7                               # DW_AT_low_pc
+  .long .Ltmp8-.Ltmp7                   # DW_AT_high_pc
+  .byte 1                               # DW_AT_call_file
+  .byte 15                              # DW_AT_call_line
+  .byte 29                              # DW_AT_call_column
+  .byte 3                               # Abbrev [3] 0xc2:0x8 DW_TAG_formal_parameter
+  .byte 2                               # DW_AT_location
+  .byte 145
+  .byte 124
+  .long 107                             # DW_AT_abstract_origin
+  .byte 5                               # Abbrev [5] 0xca:0x8 DW_TAG_variable
+  .byte 2                               # DW_AT_location
+  .byte 145
+  .byte 120
+  .long 115                             # DW_AT_abstract_origin
+  .byte 0                               # End Of Children Mark
+  .byte 0                               # End Of Children Mark
+  .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 222                             # DW_AT_type
+  .byte 15                              # Abbrev [15] 0xde:0x5 DW_TAG_const_type
+  .long 227                             # DW_AT_type
+  .byte 8                               # Abbrev [8] 0xe3:0x4 DW_TAG_base_type
+  .byte 10                              # DW_AT_name
+  .byte 6                               # DW_AT_encoding
+  .byte 1                               # DW_AT_byte_size
+  .byte 0                               # End Of Children Mark
+.Ldebug_info_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 85                              # DW_AT_ranges
+  .byte 23                              # DW_FORM_sec_offset
+  .byte 64                              # DW_AT_frame_base
+  .byte 24                              # DW_FORM_exprloc
+  .byte 49                              # DW_AT_abstract_origin
+  .byte 19                              # DW_FORM_ref4
+  .byte 0                               # EOM(1)
+  .byte 0                               # EOM(2)
+  .byte 3                               # Abbreviation Code
+  .byte 5                               # DW_TAG_formal_parameter
+  .byte 0                               # DW_CHILDREN_no
+  .byte 2                               # DW_AT_location
+  .byte 24                              # DW_FORM_exprloc
+  .byte 49                              # DW_AT_abstract_origin
+  .byte 19                              # DW_FORM_ref4
+  .byte 0                               # EOM(1)
+  .byte 0                               # EOM(2)
+  .byte 4                               # Abbreviation Code
+  .byte 46                              # DW_TAG_subprogram
+  .byte 1                               # DW_CHILDREN_yes
+  .byte 17                              # DW_AT_low_pc
+  .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
+  .byte 49                              # DW_AT_abstract_origin
+  .byte 19                              # DW_FORM_ref4
+  .byte 0                               # EOM(1)
+  .byte 0                               # EOM(2)
+  .byte 5                               # Abbreviation Code
+  .byte 52                              # DW_TAG_variable
+  .byte 0                               # DW_CHILDREN_no
+  .byte 2                               # DW_AT_location
+  .byte 24                              # DW_FORM_exprloc
+  .byte 49                              # DW_AT_abstract_origin
+  .byte 19                              # DW_FORM_ref4
+  .byte 0                               # EOM(1)
+  .byte 0                               # EOM(2)
+  .byte 6                               # 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 73                              # DW_AT_type
+  .byte 19                              # DW_FORM_ref4
+  .byte 63                              # DW_AT_external
+  .byte 25                              # DW_FORM_flag_present
+  .byte 32                              # DW_AT_inline
+  .byte 11                              # DW_FORM_data1
+  .byte 0                               # EOM(1)
+  .byte 0                               # EOM(2)
+  .byte 7                               # 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 8                               # 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 9                               # 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 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 46                              # DW_TAG_subprogram
+  .byte 1                               # DW_CHILDREN_yes
+  .byte 85                              # DW_AT_ranges
+  .byte 23                              # DW_FORM_sec_offset
+  .byte 64                              # DW_AT_frame_base
+  .byte 24                              # DW_FORM_exprloc
+  .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 24                              # DW_FORM_exprloc
+  .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 1                               # DW_CHILDREN_yes
+  .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 13                              # Abbreviation Code
+  .byte 29                              # DW_TAG_inlined_subroutine
+  .byte 1                               # DW_CHILDREN_yes
+  .byte 49                              # DW_AT_abstract_origin
+  .byte 19                              # DW_FORM_ref4
+  .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 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 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_addr,"",@progbits
+.Laddr_table_base0:
+  .quad _Z7doStuffi.__part.1
+  .quad _Z7doStuffi.__part.2
+  .quad .Lfunc_begin0
+  .quad .Lfunc_begin1
+  .quad main.__part.1
+  .quad main.__part.2
+  .quad .Lfunc_begin2
+  .quad .Ltmp7
+  .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 74                              # DIE offset
+  .byte 48                              # Attributes: FUNCTION, EXTERNAL
+  .asciz  "doStuff"                       # External Name
+  .long 97                              # DIE offset
+  .byte 48                              # Attributes: FUNCTION, EXTERNAL
+  .asciz  "doStuff2"                      # External Name
+  .long 124                             # 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 93                              # DIE offset
+  .byte 144                             # Attributes: TYPE, STATIC
+  .asciz  "int"                           # External Name
+  .long 227                             # 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
+  .section  .debug_line,"",@progbits
+.Lline_table_start0:

bolt/test/X86/Inputs/dwarf5-df-input-lowpc-ranges-main.s

+# clang++ -fbasic-block-sections=all -ffunction-sections -g2 -gdwarf-5 -gsplit-dwarf
+# __attribute__((always_inline))
+# int doStuff(int val) {
+#   if (val)
+#     ++val;
+#   return val;
+# }
+# __attribute__((always_inline))
+# int doStuff2(int val) {
+#   int foo = 3;
+#   return val + foo;
+# }
+#
+#
+# int main(int argc, const char** argv) {
+#     return  doStuff(argc) + doStuff2(argc);;
+# }
+  .text
+  .file "main.cpp"
+  .section  .text._Z7doStuffi,"ax",@progbits
+  .globl  _Z7doStuffi                     # -- Begin function _Z7doStuffi
+  .p2align  4, 0x90
+  .type _Z7doStuffi,@function
+_Z7doStuffi:                            # @_Z7doStuffi
+.Lfunc_begin0:
+  .file 0 "." "main.cpp" md5 0x69a746524dda095f8ea37f5a26dd1e9b
+  .loc  0 2 0                           # main.cpp:2:0
+  .cfi_startproc
+# %bb.0:                                # %entry
+  pushq %rbp
+  .cfi_def_cfa_offset 16
+  .cfi_offset %rbp, -16
+  movq  %rsp, %rbp
+  .cfi_def_cfa_register %rbp
+  movl  %edi, -4(%rbp)
+.Ltmp0:
+  .loc  0 3 7 prologue_end              # main.cpp:3:7
+  cmpl  $0, -4(%rbp)
+.Ltmp1:
+  .loc  0 3 7 is_stmt 0                 # main.cpp:3:7
+  je  _Z7doStuffi.__part.2
+  jmp _Z7doStuffi.__part.1
+.LBB_END0_0:
+  .cfi_endproc
+  .section  .text._Z7doStuffi,"ax",@progbits,unique,1
+_Z7doStuffi.__part.1:                   # %if.then
+  .cfi_startproc
+  .cfi_def_cfa %rbp, 16
+  .cfi_offset %rbp, -16
+  .loc  0 4 5 is_stmt 1                 # main.cpp:4:5
+  movl  -4(%rbp), %eax
+  addl  $1, %eax
+  movl  %eax, -4(%rbp)
+  jmp _Z7doStuffi.__part.2
+.LBB_END0_1:
+  .size _Z7doStuffi.__part.1, .LBB_END0_1-_Z7doStuffi.__part.1
+  .cfi_endproc
+  .section  .text._Z7doStuffi,"ax",@progbits,unique,2
+_Z7doStuffi.__part.2:                   # %if.end
+  .cfi_startproc
+  .cfi_def_cfa %rbp, 16
+  .cfi_offset %rbp, -16
+  .loc  0 5 10                          # main.cpp:5:10
+  movl  -4(%rbp), %eax
+  .loc  0 5 3 epilogue_begin is_stmt 0  # main.cpp:5:3
+  popq  %rbp
+  .cfi_def_cfa %rsp, 8
+  retq
+.LBB_END0_2:
+  .size _Z7doStuffi.__part.2, .LBB_END0_2-_Z7doStuffi.__part.2
+  .cfi_endproc
+  .section  .text._Z7doStuffi,"ax",@progbits
+.Lfunc_end0:
+  .size _Z7doStuffi, .Lfunc_end0-_Z7doStuffi
+                                        # -- End function
+  .section  .text._Z8doStuff2i,"ax",@progbits
+  .globl  _Z8doStuff2i                    # -- Begin function _Z8doStuff2i
+  .p2align  4, 0x90
+  .type _Z8doStuff2i,@function
+_Z8doStuff2i:                           # @_Z8doStuff2i
+.Lfunc_begin1:
+  .loc  0 8 0 is_stmt 1                 # main.cpp:8:0
+  .cfi_startproc
+# %bb.0:                                # %entry
+  pushq %rbp
+  .cfi_def_cfa_offset 16
+  .cfi_offset %rbp, -16
+  movq  %rsp, %rbp
+  .cfi_def_cfa_register %rbp
+  movl  %edi, -4(%rbp)
+.Ltmp2:
+  .loc  0 9 7 prologue_end              # main.cpp:9:7
+  movl  $3, -8(%rbp)
+  .loc  0 10 10                         # main.cpp:10:10
+  movl  -4(%rbp), %eax
+  .loc  0 10 14 is_stmt 0               # main.cpp:10:14
+  addl  -8(%rbp), %eax
+  .loc  0 10 3 epilogue_begin           # main.cpp:10:3
+  popq  %rbp
+  .cfi_def_cfa %rsp, 8
+  retq
+.LBB_END1_0:
+  .cfi_endproc
+.Lfunc_end1:
+  .size _Z8doStuff2i, .Lfunc_end1-_Z8doStuff2i
+                                        # -- End function
+  .section  .text.main,"ax",@progbits
+  .globl  main                            # -- Begin function main
+  .p2align  4, 0x90
+  .type main,@function
+main:                                   # @main
+.Lfunc_begin2:
+  .loc  0 14 0 is_stmt 1                # main.cpp:14:0
+  .cfi_startproc
+# %bb.0:                                # %entry
+  pushq %rbp
+  .cfi_def_cfa_offset 16
+  .cfi_offset %rbp, -16
+  movq  %rsp, %rbp
+  .cfi_def_cfa_register %rbp
+  movl  $0, -16(%rbp)
+  movl  %edi, -20(%rbp)
+  movq  %rsi, -32(%rbp)
+.Ltmp3:
+  .loc  0 15 21 prologue_end            # main.cpp:15:21
+  movl  -20(%rbp), %eax
+  movl  %eax, -12(%rbp)
+.Ltmp4:
+  .loc  0 3 7                           # main.cpp:3:7
+  cmpl  $0, -12(%rbp)
+.Ltmp5:
+  .loc  0 3 7 is_stmt 0                 # main.cpp:3:7
+  je  main.__part.2
+  jmp main.__part.1
+.LBB_END2_0:
+  .cfi_endproc
+  .section  .text.main,"ax",@progbits,unique,3
+main.__part.1:                          # %if.then.i
+  .cfi_startproc
+  .cfi_def_cfa %rbp, 16
+  .cfi_offset %rbp, -16
+  .loc  0 4 5 is_stmt 1                 # main.cpp:4:5
+  movl  -12(%rbp), %eax
+  addl  $1, %eax
+  movl  %eax, -12(%rbp)
+  jmp main.__part.2
+.LBB_END2_1:
+  .size main.__part.1, .LBB_END2_1-main.__part.1
+  .cfi_endproc
+  .section  .text.main,"ax",@progbits,unique,4
+main.__part.2:                          # %_Z7doStuffi.exit
+  .cfi_startproc
+  .cfi_def_cfa %rbp, 16
+  .cfi_offset %rbp, -16
+  .loc  0 5 10                          # main.cpp:5:10
+  movl  -12(%rbp), %eax
+.Ltmp6:
+  .loc  0 15 38                         # main.cpp:15:38
+  movl  -20(%rbp), %ecx
+  movl  %ecx, -4(%rbp)
+.Ltmp7:
+  .loc  0 9 7                           # main.cpp:9:7
+  movl  $3, -8(%rbp)
+  .loc  0 10 10                         # main.cpp:10:10
+  movl  -4(%rbp), %ecx
+  .loc  0 10 14 is_stmt 0               # main.cpp:10:14
+  addl  -8(%rbp), %ecx
+.Ltmp8:
+  .loc  0 15 27 is_stmt 1               # main.cpp:15:27
+  addl  %ecx, %eax
+  .loc  0 15 5 epilogue_begin is_stmt 0 # main.cpp:15:5
+  popq  %rbp
+  .cfi_def_cfa %rsp, 8
+  retq
+.LBB_END2_2:
+  .size main.__part.2, .LBB_END2_2-main.__part.2
+  .cfi_endproc
+  .section  .text.main,"ax",@progbits
+.Lfunc_end2:
+  .size main, .Lfunc_end2-main
+                                        # -- End function
+  .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 1                               # DW_FORM_addr
+  .byte 85                              # DW_AT_ranges
+  .byte 35                              # DW_FORM_rnglistx
+  .byte 115                             # DW_AT_addr_base
+  .byte 23                              # DW_FORM_sec_offset
+  .byte 116                             # DW_AT_rnglists_base
+  .byte 23                              # DW_FORM_sec_offset
+  .byte 0                               # EOM(1)
+  .byte 0                               # EOM(2)
+  .byte 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 1354107878901449185
+  .byte 1                               # Abbrev [1] 0x14:0x1c 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
+  .quad 0                               # DW_AT_low_pc
+  .byte 0                               # DW_AT_ranges
+  .long .Laddr_table_base0              # DW_AT_addr_base
+  .long .Lrnglists_table_base0          # DW_AT_rnglists_base
+.Ldebug_info_end0:
+  .section  .debug_rnglists,"",@progbits
+  .long .Ldebug_list_header_end0-.Ldebug_list_header_start0 # Length
+.Ldebug_list_header_start0:
+  .short  5                               # Version
+  .byte 8                               # Address size
+  .byte 0                               # Segment selector size
+  .long 1                               # Offset entry count
+.Lrnglists_table_base0:
+  .long .Ldebug_ranges4-.Lrnglists_table_base0
+.Ldebug_ranges4:
+  .byte 3                               # DW_RLE_startx_length
+  .byte 0                               #   start index
+  .uleb128 .LBB_END0_1-_Z7doStuffi.__part.1 #   length
+  .byte 3                               # DW_RLE_startx_length
+  .byte 1                               #   start index
+  .uleb128 .LBB_END0_2-_Z7doStuffi.__part.2 #   length
+  .byte 3                               # DW_RLE_startx_length
+  .byte 2                               #   start index
+  .uleb128 .Lfunc_end0-.Lfunc_begin0      #   length
+  .byte 3                               # DW_RLE_startx_length
+  .byte 3                               #   start index
+  .uleb128 .Lfunc_end1-.Lfunc_begin1      #   length
+  .byte 3                               # DW_RLE_startx_length
+  .byte 4                               #   start index
+  .uleb128 .LBB_END2_1-main.__part.1      #   length
+  .byte 3                               # DW_RLE_startx_length
+  .byte 5                               #   start index
+  .uleb128 .LBB_END2_2-main.__part.2      #   length
+  .byte 3                               # DW_RLE_startx_length
+  .byte 6                               #   start index
+  .uleb128 .Lfunc_end2-.Lfunc_begin2      #   length
+  .byte 0                               # DW_RLE_end_of_list
+.Ldebug_list_header_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 60                              # Length of String Offsets Set
+  .short  5
+  .short  0
+  .section  .debug_str.dwo,"eMS",@progbits,1
+.Linfo_string0:
+  .asciz  "_Z7doStuffi"                   # string offset=0
+.Linfo_string1:
+  .asciz  "doStuff"                       # string offset=12
+.Linfo_string2:
+  .asciz  "int"                           # string offset=20
+.Linfo_string3:
+  .asciz  "val"                           # string offset=24
+.Linfo_string4:
+  .asciz  "_Z8doStuff2i"                  # string offset=28
+.Linfo_string5:
+  .asciz  "doStuff2"                      # string offset=41
+.Linfo_string6:
+  .asciz  "foo"                           # string offset=50
+.Linfo_string7:
+  .asciz  "main"                          # string offset=54
+.Linfo_string8:
+  .asciz  "argc"                          # string offset=59
+.Linfo_string9:
+  .asciz  "argv"                          # string offset=64
+.Linfo_string10:
+  .asciz  "char"                          # string offset=69
+.Linfo_string11:
+  .asciz  "clang version 18.0.0 ([e-mail]:llvm/llvm-project.git 3a8db0f4bfb57348f49d9603119fa157114bbf8e)" # string offset=74
+.Linfo_string12:
+  .asciz  "main.cpp"                      # string offset=175
+.Linfo_string13:
+  .asciz  "main.dwo"                      # string offset=184
+  .section  .debug_str_offsets.dwo,"e",@progbits
+  .long 0
+  .long 12
+  .long 20
+  .long 24
+  .long 28
+  .long 41
+  .long 50
+  .long 54
+  .long 59
+  .long 64
+  .long 69
+  .long 74
+  .long 175
+  .long 184
+  .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 1354107878901449185
+  .byte 1                               # Abbrev [1] 0x14:0xc6 DW_TAG_compile_unit
+  .byte 11                              # DW_AT_producer
+  .short  33                              # DW_AT_language
+  .byte 12                              # DW_AT_name
+  .byte 13                              # DW_AT_dwo_name
+  .byte 2                               # Abbrev [2] 0x1a:0x11 DW_TAG_subprogram
+  .byte 0                               # DW_AT_ranges
+  .byte 1                               # DW_AT_frame_base
+  .byte 86
+  .long 72                              # DW_AT_abstract_origin
+  .byte 3                               # Abbrev [3] 0x22:0x8 DW_TAG_formal_parameter
+  .byte 2                               # DW_AT_location
+  .byte 145
+  .byte 124
+  .long 81                              # DW_AT_abstract_origin
+  .byte 0                               # End Of Children Mark
+  .byte 4                               # Abbrev [4] 0x2b:0x1d DW_TAG_subprogram
+  .byte 3                               # DW_AT_low_pc
+  .long .Lfunc_end1-.Lfunc_begin1       # DW_AT_high_pc
+  .byte 1                               # DW_AT_frame_base
+  .byte 86
+  .long 94                              # DW_AT_abstract_origin
+  .byte 3                               # Abbrev [3] 0x37:0x8 DW_TAG_formal_parameter
+  .byte 2                               # DW_AT_location
+  .byte 145
+  .byte 124
+  .long 103                             # DW_AT_abstract_origin
+  .byte 5                               # Abbrev [5] 0x3f:0x8 DW_TAG_variable
+  .byte 2                               # DW_AT_location
+  .byte 145
+  .byte 120
+  .long 111                             # DW_AT_abstract_origin
+  .byte 0                               # End Of Children Mark
+  .byte 6                               # Abbrev [6] 0x48:0x12 DW_TAG_subprogram
+  .byte 0                               # DW_AT_linkage_name
+  .byte 1                               # DW_AT_name
+  .byte 0                               # DW_AT_decl_file
+  .byte 2                               # DW_AT_decl_line
+  .long 90                              # DW_AT_type
+                                        # DW_AT_external
+                                        # DW_AT_inline
+  .byte 7                               # Abbrev [7] 0x51:0x8 DW_TAG_formal_parameter
+  .byte 3                               # DW_AT_name
+  .byte 0                               # DW_AT_decl_file
+  .byte 2                               # DW_AT_decl_line
+  .long 90                              # DW_AT_type
+  .byte 0                               # End Of Children Mark
+  .byte 8                               # Abbrev [8] 0x5a:0x4 DW_TAG_base_type
+  .byte 2                               # DW_AT_name
+  .byte 5                               # DW_AT_encoding
+  .byte 4                               # DW_AT_byte_size
+  .byte 6                               # Abbrev [6] 0x5e:0x1a DW_TAG_subprogram
+  .byte 4                               # DW_AT_linkage_name
+  .byte 5                               # DW_AT_name
+  .byte 0                               # DW_AT_decl_file
+  .byte 8                               # DW_AT_decl_line
+  .long 90                              # DW_AT_type
+                                        # DW_AT_external
+                                        # DW_AT_inline
+  .byte 7                               # Abbrev [7] 0x67:0x8 DW_TAG_formal_parameter
+  .byte 3                               # DW_AT_name
+  .byte 0                               # DW_AT_decl_file
+  .byte 8                               # DW_AT_decl_line
+  .long 90                              # DW_AT_type
+  .byte 9                               # Abbrev [9] 0x6f:0x8 DW_TAG_variable
+  .byte 6                               # DW_AT_name
+  .byte 0                               # DW_AT_decl_file
+  .byte 9                               # DW_AT_decl_line
+  .long 90                              # DW_AT_type
+  .byte 0                               # End Of Children Mark
+  .byte 10                              # Abbrev [10] 0x78:0x4e DW_TAG_subprogram
+  .byte 1                               # DW_AT_ranges
+  .byte 1                               # DW_AT_frame_base
+  .byte 86
+  .byte 7                               # DW_AT_name
+  .byte 0                               # DW_AT_decl_file
+  .byte 14                              # DW_AT_decl_line
+  .long 90                              # DW_AT_type
+                                        # DW_AT_external
+  .byte 11                              # Abbrev [11] 0x83:0xb DW_TAG_formal_parameter
+  .byte 2                               # DW_AT_location
+  .byte 145
+  .byte 108
+  .byte 8                               # DW_AT_name
+  .byte 0                               # DW_AT_decl_file
+  .byte 14                              # DW_AT_decl_line
+  .long 90                              # DW_AT_type
+  .byte 11                              # Abbrev [11] 0x8e:0xb DW_TAG_formal_parameter
+  .byte 2                               # DW_AT_location
+  .byte 145
+  .byte 96
+  .byte 9                               # DW_AT_name
+  .byte 0                               # DW_AT_decl_file
+  .byte 14                              # DW_AT_decl_line
+  .long 198                             # DW_AT_type
+  .byte 12                              # Abbrev [12] 0x99:0x12 DW_TAG_inlined_subroutine
+  .long 72                              # DW_AT_abstract_origin
+  .byte 2                               # DW_AT_ranges
+  .byte 0                               # DW_AT_call_file
+  .byte 15                              # DW_AT_call_line
+  .byte 13                              # DW_AT_call_column
+  .byte 3                               # Abbrev [3] 0xa2:0x8 DW_TAG_formal_parameter
+  .byte 2                               # DW_AT_location
+  .byte 145
+  .byte 116
+  .long 81                              # DW_AT_abstract_origin
+  .byte 0                               # End Of Children Mark
+  .byte 12                              # Abbrev [12] 0xab:0x1a DW_TAG_inlined_subroutine
+  .long 94                              # DW_AT_abstract_origin
+  .byte 3                               # DW_AT_ranges
+  .byte 0                               # DW_AT_call_file
+  .byte 15                              # DW_AT_call_line
+  .byte 29                              # DW_AT_call_column
+  .byte 3                               # Abbrev [3] 0xb4:0x8 DW_TAG_formal_parameter
+  .byte 2                               # DW_AT_location
+  .byte 145
+  .byte 124
+  .long 103                             # DW_AT_abstract_origin
+  .byte 5                               # Abbrev [5] 0xbc:0x8 DW_TAG_variable
+  .byte 2                               # DW_AT_location
+  .byte 145
+  .byte 120
+  .long 111                             # DW_AT_abstract_origin
+  .byte 0                               # End Of Children Mark
+  .byte 0                               # End Of Children Mark
+  .byte 13                              # Abbrev [13] 0xc6:0x5 DW_TAG_pointer_type
+  .long 203                             # DW_AT_type
+  .byte 13                              # Abbrev [13] 0xcb:0x5 DW_TAG_pointer_type
+  .long 208                             # DW_AT_type
+  .byte 14                              # Abbrev [14] 0xd0:0x5 DW_TAG_const_type
+  .long 213                             # DW_AT_type
+  .byte 8                               # Abbrev [8] 0xd5:0x4 DW_TAG_base_type
+  .byte 10                              # DW_AT_name
+  .byte 6                               # DW_AT_encoding
+  .byte 1                               # DW_AT_byte_size
+  .byte 0                               # End Of Children Mark
+.Ldebug_info_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 85                              # DW_AT_ranges
+  .byte 35                              # DW_FORM_rnglistx
+  .byte 64                              # DW_AT_frame_base
+  .byte 24                              # DW_FORM_exprloc
+  .byte 49                              # DW_AT_abstract_origin
+  .byte 19                              # DW_FORM_ref4
+  .byte 0                               # EOM(1)
+  .byte 0                               # EOM(2)
+  .byte 3                               # Abbreviation Code
+  .byte 5                               # DW_TAG_formal_parameter
+  .byte 0                               # DW_CHILDREN_no
+  .byte 2                               # DW_AT_location
+  .byte 24                              # DW_FORM_exprloc
+  .byte 49                              # DW_AT_abstract_origin
+  .byte 19                              # DW_FORM_ref4
+  .byte 0                               # EOM(1)
+  .byte 0                               # EOM(2)
+  .byte 4                               # Abbreviation Code
+  .byte 46                              # DW_TAG_subprogram
+  .byte 1                               # DW_CHILDREN_yes
+  .byte 17                              # DW_AT_low_pc
+  .byte 27                              # DW_FORM_addrx
+  .byte 18                              # DW_AT_high_pc
+  .byte 6                               # DW_FORM_data4
+  .byte 64                              # DW_AT_frame_base
+  .byte 24                              # DW_FORM_exprloc
+  .byte 49                              # DW_AT_abstract_origin
+  .byte 19                              # DW_FORM_ref4
+  .byte 0                               # EOM(1)
+  .byte 0                               # EOM(2)
+  .byte 5                               # Abbreviation Code
+  .byte 52                              # DW_TAG_variable
+  .byte 0                               # DW_CHILDREN_no
+  .byte 2                               # DW_AT_location
+  .byte 24                              # DW_FORM_exprloc
+  .byte 49                              # DW_AT_abstract_origin
+  .byte 19                              # DW_FORM_ref4
+  .byte 0                               # EOM(1)
+  .byte 0                               # EOM(2)
+  .byte 6                               # Abbreviation Code
+  .byte 46                              # DW_TAG_subprogram
+  .byte 1                               # DW_CHILDREN_yes
+  .byte 110                             # DW_AT_linkage_name
+  .byte 37                              # DW_FORM_strx1
+  .byte 3                               # DW_AT_name
+  .byte 37                              # DW_FORM_strx1
+  .byte 58                              # DW_AT_decl_file
+  .byte 11                              # DW_FORM_data1
+  .byte 59                              # DW_AT_decl_line
+  .byte 11                              # DW_FORM_data1
+  .byte 73                              # DW_AT_type
+  .byte 19                              # DW_FORM_ref4
+  .byte 63                              # DW_AT_external
+  .byte 25                              # DW_FORM_flag_present
+  .byte 32                              # DW_AT_inline
+  .byte 33                              # DW_FORM_implicit_const
+  .byte 1
+  .byte 0                               # EOM(1)
+  .byte 0                               # EOM(2)
+  .byte 7                               # 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 8                               # 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 9                               # Abbreviation Code
+  .byte 52                              # DW_TAG_variable
+  .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 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 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 24                              # DW_FORM_exprloc
+  .byte 3                               # DW_AT_name
+  .byte 37                              # DW_FORM_strx1
+  .byte 58                              # DW_AT_decl_file
+  .byte 11                              # DW_FORM_data1
+  .byte 59                              # DW_AT_decl_line
+  .byte 11                              # DW_FORM_data1
+  .byte 73                              # DW_AT_type
+  .byte 19                              # DW_FORM_ref4
+  .byte 0                               # EOM(1)
+  .byte 0                               # EOM(2)
+  .byte 12                              # Abbreviation Code
+  .byte 29                              # DW_TAG_inlined_subroutine
+  .byte 1                               # DW_CHILDREN_yes
+  .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 13                              # 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 14                              # 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_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 4                               # Offset entry count
+.Lrnglists_dwo_table_base0:
+  .long .Ldebug_ranges0-.Lrnglists_dwo_table_base0
+  .long .Ldebug_ranges1-.Lrnglists_dwo_table_base0
+  .long .Ldebug_ranges2-.Lrnglists_dwo_table_base0
+  .long .Ldebug_ranges3-.Lrnglists_dwo_table_base0
+.Ldebug_ranges0:
+  .byte 3                               # DW_RLE_startx_length
+  .byte 0                               #   start index
+  .uleb128 .LBB_END0_1-_Z7doStuffi.__part.1 #   length
+  .byte 3                               # DW_RLE_startx_length
+  .byte 1                               #   start index
+  .uleb128 .LBB_END0_2-_Z7doStuffi.__part.2 #   length
+  .byte 3                               # DW_RLE_startx_length
+  .byte 2                               #   start index
+  .uleb128 .Lfunc_end0-.Lfunc_begin0      #   length
+  .byte 0                               # DW_RLE_end_of_list
+.Ldebug_ranges1:
+  .byte 3                               # DW_RLE_startx_length
+  .byte 4                               #   start index
+  .uleb128 .LBB_END2_1-main.__part.1      #   length
+  .byte 3                               # DW_RLE_startx_length
+  .byte 5                               #   start index
+  .uleb128 .LBB_END2_2-main.__part.2      #   length
+  .byte 3                               # DW_RLE_startx_length
+  .byte 6                               #   start index
+  .uleb128 .Lfunc_end2-.Lfunc_begin2      #   length
+  .byte 0                               # DW_RLE_end_of_list
+.Ldebug_ranges2:
+  .byte 1                               # DW_RLE_base_addressx
+  .byte 6                               #   base address index
+  .byte 4                               # DW_RLE_offset_pair
+  .uleb128 .Ltmp4-.Lfunc_begin2           #   starting offset
+  .uleb128 .Lfunc_end2-.Lfunc_begin2      #   ending offset
+  .byte 3                               # DW_RLE_startx_length
+  .byte 4                               #   start index
+  .uleb128 .LBB_END2_1-main.__part.1      #   length
+  .byte 3                               # DW_RLE_startx_length
+  .byte 5                               #   start index
+  .uleb128 .Ltmp6-main.__part.2           #   length
+  .byte 0                               # DW_RLE_end_of_list
+.Ldebug_ranges3:
+  .byte 1                               # DW_RLE_base_addressx
+  .byte 5                               #   base address index
+  .byte 4                               # DW_RLE_offset_pair
+  .uleb128 .Ltmp7-main.__part.2           #   starting offset
+  .uleb128 .Ltmp8-main.__part.2           #   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 _Z7doStuffi.__part.1
+  .quad _Z7doStuffi.__part.2
+  .quad .Lfunc_begin0
+  .quad .Lfunc_begin1
+  .quad main.__part.1
+  .quad main.__part.2
+  .quad .Lfunc_begin2
+.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 48                              # Compilation Unit Length
+  .long 72                              # DIE offset
+  .byte 48                              # Attributes: FUNCTION, EXTERNAL
+  .asciz  "doStuff"                       # External Name
+  .long 94                              # DIE offset
+  .byte 48                              # Attributes: FUNCTION, EXTERNAL
+  .asciz  "doStuff2"                      # External Name
+  .long 120                             # 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 48                              # Compilation Unit Length
+  .long 90                              # DIE offset
+  .byte 144                             # Attributes: TYPE, STATIC
+  .asciz  "int"                           # External Name
+  .long 213                             # 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
+  .section  .debug_line,"",@progbits
+.Lline_table_start0:

bolt/test/X86/dwarf4-df-input-lowpc-ranges.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-input-lowpc-ranges-main.s \
+; RUN: -split-dwarf-file=main.dwo -o main.o
+; RUN: %clang %cflags -gdwarf-4 -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-ranges main.exe.bolt &> %t/foo.txt
+; RUN: llvm-dwarfdump --show-form --verbose --debug-info main.exe.bolt >> %t/foo.txt
+; RUN: cat %t/foo.txt | FileCheck -check-prefix=BOLT %s
+; RUN: not llvm-dwarfdump --show-form --verbose --debug-info main.dwo.dwo &> %t/mainddwodwo.txt
+; RUN: cat %t/mainddwodwo.txt | FileCheck -check-prefix=BOLT-DWO-MAIN %s
+
+; Tests BOLT handles correctly Skeleton CU which has DW_AT_low_pc/DW_AT_ranges as input.
+
+; BOLT: .debug_ranges
+; BOLT-NEXT: 00000000 <End of list>
+; BOLT-NEXT: 00000010
+; BOLT-NEXT: 00000010
+; BOLT-NEXT: 00000010
+; BOLT-NEXT: 00000010 <End of list>
+; BOLT-NEXT: 00000050
+; BOLT-NEXT: 00000050
+; BOLT-NEXT: 00000050
+; BOLT-NEXT: 00000050 <End of list>
+; BOLT-NEXT: 00000090 [[#%.16x,ADDR1:]] [[#%.16x,ADDRB1:]]
+; BOLT-NEXT: 00000090 [[#%.16x,ADDR2:]] [[#%.16x,ADDRB2:]]
+; BOLT-NEXT: 00000090 [[#%.16x,ADDR3:]] [[#%.16x,ADDRB3:]]
+; BOLT-NEXT: 00000090 [[#%.16x,ADDR4:]] [[#%.16x,ADDRB4:]]
+; BOLT-NEXT: 00000090 [[#%.16x,ADDR5:]] [[#%.16x,ADDRB5:]]
+; BOLT-NEXT: 00000090 [[#%.16x,ADDR6:]] [[#%.16x,ADDRB6:]]
+; BOLT-NEXT: 00000090 [[#%.16x,ADDR7:]] [[#%.16x,ADDRB7:]]
+; BOLT-NEXT: 00000090 <End of list>
+
+; BOLT: DW_TAG_compile_unit
+; BOLT: DW_AT_GNU_dwo_name [DW_FORM_strp] ( .debug_str[0x{{[0-9a-fA-F]+}}] = "main.dwo.dwo")
+; BOLT-NEXT: DW_AT_GNU_dwo_id
+; BOLT-NEXT: DW_AT_GNU_ranges_base [DW_FORM_sec_offset]  (0x00000010)
+; BOLT-NEXT: DW_AT_low_pc [DW_FORM_addr] (0x0000000000000000)
+; BOLT-NEXT: DW_AT_ranges [DW_FORM_sec_offset] (0x00000090
+; BOLT-NEXT: [0x[[#ADDR1]], 0x[[#ADDRB1]])
+; BOLT-NEXT: [0x[[#ADDR2]], 0x[[#ADDRB2]])
+; BOLT-NEXT: [0x[[#ADDR3]], 0x[[#ADDRB3]])
+; BOLT-NEXT: [0x[[#ADDR4]], 0x[[#ADDRB4]])
+; BOLT-NEXT: [0x[[#ADDR5]], 0x[[#ADDRB5]])
+; BOLT-NEXT: [0x[[#ADDR6]], 0x[[#ADDRB6]])
+; BOLT-NEXT: [0x[[#ADDR7]], 0x[[#ADDRB7]])
+; BOLT-NEXT: DW_AT_GNU_addr_base [DW_FORM_sec_offset]  (0x00000000)
+
+; BOLT-DWO-MAIN:        DW_TAG_subprogram
+; BOLT-DWO-MAIN-NEXT:   DW_AT_ranges [DW_FORM_sec_offset] (0x00000000
+; BOLT-DWO-MAIN:        DW_TAG_subprogram
+; BOLT-DWO-MAIN:        DW_TAG_subprogram
+; BOLT-DWO-MAIN:        DW_TAG_subprogram
+; BOLT-DWO-MAIN:        DW_TAG_subprogram
+; BOLT-DWO-MAIN-NEXT:   DW_AT_ranges [DW_FORM_sec_offset] (0x00000040

bolt/test/X86/dwarf5-df-input-lowpc-ranges.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-input-lowpc-ranges-main.s \
+; RUN: -split-dwarf-file=main.dwo -o main.o
+; RUN: %clang %cflags -gdwarf-4 -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-rnglists main.exe.bolt &> %t/foo.txt
+; RUN: llvm-dwarfdump --show-form --verbose --debug-addr main.exe.bolt >> %t/foo.txt
+; RUN: llvm-dwarfdump --show-form --verbose --debug-info main.exe.bolt >> %t/foo.txt
+; RUN: cat %t/foo.txt | FileCheck -check-prefix=BOLT %s
+; RUN: llvm-dwarfdump --show-form --verbose --debug-info main.dwo.dwo &> %t/mainddwodwo.txt
+; RUN: cat %t/mainddwodwo.txt | FileCheck -check-prefix=BOLT-DWO-MAIN %s
+
+; Tests BOLT handles correctly Skeleton CU which has DW_AT_low_pc/DW_AT_ranges as input.
+
+; BOLT: Addrs: [
+; BOLT-NEXT: 0x[[#%.16x,ADDR1:]]
+; BOLT-NEXT: 0x[[#%.16x,ADDR2:]]
+; BOLT-NEXT: 0x[[#%.16x,ADDR3:]]
+; BOLT-NEXT: 0x[[#%.16x,ADDR4:]]
+; BOLT-NEXT: 0x[[#%.16x,ADDR5:]]
+
+
+; BOLT: DW_TAG_skeleton_unit
+; BOLT: DW_AT_dwo_name [DW_FORM_strx1]  (indexed (00000001) string = "main.dwo.dwo")
+; BOLT-NEXT: DW_AT_low_pc [DW_FORM_addr] (0x0000000000000000)
+; BOLT-NEXT: DW_AT_ranges [DW_FORM_rnglistx] (indexed (0x0) rangelist = 0x00000010
+; BOLT-NEXT: [0x[[#ADDR1]], 0x[[#ADDR1 + 0x16]])
+; BOLT-NEXT: [0x[[#ADDR1 + 0x16]], 0x[[#ADDR1 + 0x24]])
+; BOLT-NEXT: [0x[[#ADDR1 + 0x24]], 0x[[#ADDR1 + 0x29]])
+; BOLT-NEXT: [0x[[#ADDR1 + 0x30]], 0x[[#ADDR1 + 0x46]])
+; BOLT-NEXT: [0x[[#ADDR1 + 0x50]], 0x[[#ADDR1 + 0x77]])
+; BOLT-NEXT: [0x[[#ADDR1 + 0x77]], 0x[[#ADDR1 + 0x85]])
+; BOLT-NEXT: [0x[[#ADDR1 + 0x85]], 0x[[#ADDR1 + 0x9f]])
+; BOLT-NEXT: DW_AT_addr_base [DW_FORM_sec_offset]  (0x00000008)
+; BOLT-NEXT: DW_AT_rnglists_base [DW_FORM_sec_offset]  (0x0000000c)
+
+; BOLT-DWO-MAIN:        DW_TAG_subprogram
+; BOLT-DWO-MAIN-NEXT:   DW_AT_ranges [DW_FORM_rnglistx] (indexed (0x0) rangelist = 0x00000014
+; BOLT-DWO-MAIN-NEXT:       [0x0000000000000000, 0x0000000000000016)
+; BOLT-DWO-MAIN-NEXT:       [0x0000000000000016, 0x0000000000000024)
+; BOLT-DWO-MAIN-NEXT:       [0x0000000000000024, 0x0000000000000029))
+; BOLT-DWO-MAIN:        DW_TAG_subprogram
+; BOLT-DWO-MAIN:        DW_TAG_subprogram
+; BOLT-DWO-MAIN:        DW_TAG_subprogram
+; BOLT-DWO-MAIN:        DW_TAG_subprogram
+; BOLT-DWO-MAIN-NEXT:   DW_AT_ranges [DW_FORM_rnglistx] (indexed (0x1) rangelist = 0x00000020
+; BOLT-DWO-MAIN-NEXT:       [0x0000000000000002, 0x0000000000000029)
+; BOLT-DWO-MAIN-NEXT:       [0x0000000000000029, 0x0000000000000037)
+; BOLT-DWO-MAIN-NEXT:       [0x0000000000000037, 0x0000000000000051))