[BOLT][DWARF][NFC] Add split-dwarf4 test with multiple CUs (#93741)

Adds a split-dwarf test for DWARF4 with multiple CUs.

2 files changed, 807 insertions, 0 deletions

diff --git a/bolt/test/X86/Inputs/dwarf4-df-input-lowpc-ranges-other.s b/bolt/test/X86/Inputs/dwarf4-df-input-lowpc-ranges-other.s
new file mode 100644
index 0000000..c04fb52
--- /dev/null
+++ b/bolt/test/X86/Inputs/dwarf4-df-input-lowpc-ranges-other.s
@@ -0,0 +1,710 @@
+## clang++ -fbasic-block-sections=all -ffunction-sections -g2 -gdwarf-4 -gsplit-dwarf -fdebug-compilation-dir='.'
+## __attribute__((always_inline))
+## int doStuffOther(int val) {
+##   if (val)
+##     ++val;
+##   return val;
+## }
+## __attribute__((always_inline))
+## int doStuffOther2(int val) {
+##   int foo = 3;
+##   return val + foo;
+## }
+##
+##
+## int mainOther(int argc, const char** argv) {
+##     return  doStuffOther(argc) + doStuffOther2(argc);;
+## }
+
+	.text
+	.file	"mainOther.cpp"
+	.section	.text._Z12doStuffOtheri,"ax",@progbits
+	.globl	_Z12doStuffOtheri               # -- Begin function _Z12doStuffOtheri
+	.p2align	4, 0x90
+	.type	_Z12doStuffOtheri,@function
+_Z12doStuffOtheri:                      # @_Z12doStuffOtheri
+.Lfunc_begin0:
+	.file	1 "." "mainOther.cpp"
+	.loc	1 2 0                           # mainOther.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 8 prologue_end              # mainOther.cpp:3:8
+	cmpl	$0, -4(%rbp)
+.Ltmp1:
+	.loc	1 3 8 is_stmt 0                 # mainOther.cpp:3:8
+	je	_Z12doStuffOtheri.__part.2
+	jmp	_Z12doStuffOtheri.__part.1
+.LBB_END0_0:
+	.cfi_endproc
+	.section	.text._Z12doStuffOtheri,"ax",@progbits,unique,1
+_Z12doStuffOtheri.__part.1:             # %if.then
+	.cfi_startproc
+	.cfi_def_cfa %rbp, 16
+	.cfi_offset %rbp, -16
+	.loc	1 4 6 is_stmt 1                 # mainOther.cpp:4:6
+	movl	-4(%rbp), %eax
+	addl	$1, %eax
+	movl	%eax, -4(%rbp)
+	jmp	_Z12doStuffOtheri.__part.2
+.LBB_END0_1:
+	.size	_Z12doStuffOtheri.__part.1, .LBB_END0_1-_Z12doStuffOtheri.__part.1
+	.cfi_endproc
+	.section	.text._Z12doStuffOtheri,"ax",@progbits,unique,2
+_Z12doStuffOtheri.__part.2:             # %if.end
+	.cfi_startproc
+	.cfi_def_cfa %rbp, 16
+	.cfi_offset %rbp, -16
+	.loc	1 5 11                          # mainOther.cpp:5:11
+	movl	-4(%rbp), %eax
+	.loc	1 5 4 epilogue_begin is_stmt 0  # mainOther.cpp:5:4
+	popq	%rbp
+	.cfi_def_cfa %rsp, 8
+	retq
+.LBB_END0_2:
+	.size	_Z12doStuffOtheri.__part.2, .LBB_END0_2-_Z12doStuffOtheri.__part.2
+	.cfi_endproc
+	.section	.text._Z12doStuffOtheri,"ax",@progbits
+.Lfunc_end0:
+	.size	_Z12doStuffOtheri, .Lfunc_end0-_Z12doStuffOtheri
+                                        # -- End function
+	.section	.text._Z13doStuffOther2i,"ax",@progbits
+	.globl	_Z13doStuffOther2i              # -- Begin function _Z13doStuffOther2i
+	.p2align	4, 0x90
+	.type	_Z13doStuffOther2i,@function
+_Z13doStuffOther2i:                     # @_Z13doStuffOther2i
+.Lfunc_begin1:
+	.loc	1 8 0 is_stmt 1                 # mainOther.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 8 prologue_end              # mainOther.cpp:9:8
+	movl	$3, -8(%rbp)
+	.loc	1 10 11                         # mainOther.cpp:10:11
+	movl	-4(%rbp), %eax
+	.loc	1 10 15 is_stmt 0               # mainOther.cpp:10:15
+	addl	-8(%rbp), %eax
+	.loc	1 10 4 epilogue_begin           # mainOther.cpp:10:4
+	popq	%rbp
+	.cfi_def_cfa %rsp, 8
+	retq
+.LBB_END1_0:
+	.cfi_endproc
+.Lfunc_end1:
+	.size	_Z13doStuffOther2i, .Lfunc_end1-_Z13doStuffOther2i
+                                        # -- End function
+	.section	.text._Z9mainOtheriPPKc,"ax",@progbits
+	.globl	_Z9mainOtheriPPKc               # -- Begin function _Z9mainOtheriPPKc
+	.p2align	4, 0x90
+	.type	_Z9mainOtheriPPKc,@function
+_Z9mainOtheriPPKc:                      # @_Z9mainOtheriPPKc
+.Lfunc_begin2:
+	.loc	1 14 0 is_stmt 1                # mainOther.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	%edi, -16(%rbp)
+	movq	%rsi, -24(%rbp)
+.Ltmp3:
+	.loc	1 15 27 prologue_end            # mainOther.cpp:15:27
+	movl	-16(%rbp), %eax
+	movl	%eax, -12(%rbp)
+.Ltmp4:
+	.loc	1 3 8                           # mainOther.cpp:3:8
+	cmpl	$0, -12(%rbp)
+.Ltmp5:
+	.loc	1 3 8 is_stmt 0                 # mainOther.cpp:3:8
+	je	_Z9mainOtheriPPKc.__part.2
+	jmp	_Z9mainOtheriPPKc.__part.1
+.LBB_END2_0:
+	.cfi_endproc
+	.section	.text._Z9mainOtheriPPKc,"ax",@progbits,unique,3
+_Z9mainOtheriPPKc.__part.1:             # %if.then.i
+	.cfi_startproc
+	.cfi_def_cfa %rbp, 16
+	.cfi_offset %rbp, -16
+	.loc	1 4 6 is_stmt 1                 # mainOther.cpp:4:6
+	movl	-12(%rbp), %eax
+	addl	$1, %eax
+	movl	%eax, -12(%rbp)
+	jmp	_Z9mainOtheriPPKc.__part.2
+.LBB_END2_1:
+	.size	_Z9mainOtheriPPKc.__part.1, .LBB_END2_1-_Z9mainOtheriPPKc.__part.1
+	.cfi_endproc
+	.section	.text._Z9mainOtheriPPKc,"ax",@progbits,unique,4
+_Z9mainOtheriPPKc.__part.2:             # %_Z12doStuffOtheri.exit
+	.cfi_startproc
+	.cfi_def_cfa %rbp, 16
+	.cfi_offset %rbp, -16
+	.loc	1 5 11                          # mainOther.cpp:5:11
+	movl	-12(%rbp), %eax
+.Ltmp6:
+	.loc	1 15 49                         # mainOther.cpp:15:49
+	movl	-16(%rbp), %ecx
+	movl	%ecx, -4(%rbp)
+.Ltmp7:
+	.loc	1 9 8                           # mainOther.cpp:9:8
+	movl	$3, -8(%rbp)
+	.loc	1 10 11                         # mainOther.cpp:10:11
+	movl	-4(%rbp), %ecx
+	.loc	1 10 15 is_stmt 0               # mainOther.cpp:10:15
+	addl	-8(%rbp), %ecx
+.Ltmp8:
+	.loc	1 15 33 is_stmt 1               # mainOther.cpp:15:33
+	addl	%ecx, %eax
+	.loc	1 15 6 epilogue_begin is_stmt 0 # mainOther.cpp:15:6
+	popq	%rbp
+	.cfi_def_cfa %rsp, 8
+	retq
+.LBB_END2_2:
+	.size	_Z9mainOtheriPPKc.__part.2, .LBB_END2_2-_Z9mainOtheriPPKc.__part.2
+	.cfi_endproc
+	.section	.text._Z9mainOtheriPPKc,"ax",@progbits
+.Lfunc_end2:
+	.size	_Z9mainOtheriPPKc, .Lfunc_end2-_Z9mainOtheriPPKc
+                                        # -- 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	-1082921489565291703            # 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	_Z12doStuffOtheri.__part.1
+	.quad	.LBB_END0_1
+	.quad	_Z12doStuffOtheri.__part.2
+	.quad	.LBB_END0_2
+	.quad	.Lfunc_begin0
+	.quad	.Lfunc_end0
+	.quad	0
+	.quad	0
+.Ldebug_ranges1:
+	.quad	_Z9mainOtheriPPKc.__part.1
+	.quad	.LBB_END2_1
+	.quad	_Z9mainOtheriPPKc.__part.2
+	.quad	.LBB_END2_2
+	.quad	.Lfunc_begin2
+	.quad	.Lfunc_end2
+	.quad	0
+	.quad	0
+.Ldebug_ranges2:
+	.quad	.Ltmp4
+	.quad	.Lfunc_end2
+	.quad	_Z9mainOtheriPPKc.__part.1
+	.quad	.LBB_END2_1
+	.quad	_Z9mainOtheriPPKc.__part.2
+	.quad	.Ltmp6
+	.quad	0
+	.quad	0
+.Ldebug_ranges3:
+	.quad	_Z12doStuffOtheri.__part.1
+	.quad	.LBB_END0_1
+	.quad	_Z12doStuffOtheri.__part.2
+	.quad	.LBB_END0_2
+	.quad	.Lfunc_begin0
+	.quad	.Lfunc_end0
+	.quad	.Lfunc_begin1
+	.quad	.Lfunc_end1
+	.quad	_Z9mainOtheriPPKc.__part.1
+	.quad	.LBB_END2_1
+	.quad	_Z9mainOtheriPPKc.__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	"mainOther.dwo"                 # string offset=2
+	.section	.debug_str.dwo,"eMS",@progbits,1
+.Linfo_string0:
+	.asciz	"_Z12doStuffOtheri"             # string offset=0
+.Linfo_string1:
+	.asciz	"doStuffOther"                  # string offset=18
+.Linfo_string2:
+	.asciz	"int"                           # string offset=31
+.Linfo_string3:
+	.asciz	"val"                           # string offset=35
+.Linfo_string4:
+	.asciz	"_Z13doStuffOther2i"            # string offset=39
+.Linfo_string5:
+	.asciz	"doStuffOther2"                 # string offset=58
+.Linfo_string6:
+	.asciz	"foo"                           # string offset=72
+.Linfo_string7:
+	.asciz	"_Z9mainOtheriPPKc"             # string offset=76
+.Linfo_string8:
+	.asciz	"mainOther"                     # string offset=94
+.Linfo_string9:
+	.asciz	"argc"                          # string offset=104
+.Linfo_string10:
+	.asciz	"argv"                          # string offset=109
+.Linfo_string11:
+	.asciz	"char"                          # string offset=114
+.Linfo_string12:
+	.asciz	"clang version 19.0.0git (git@github.com:llvm/llvm-project.git df542e1ed82bd4e5a9e345d3a3ae63a76893a0cf)" # string offset=119
+.Linfo_string13:
+	.asciz	"mainOther.cpp"                 # string offset=223
+.Linfo_string14:
+	.asciz	"mainOther.dwo"                 # string offset=237
+	.section	.debug_str_offsets.dwo,"e",@progbits
+	.long	0
+	.long	18
+	.long	31
+	.long	35
+	.long	39
+	.long	58
+	.long	72
+	.long	76
+	.long	94
+	.long	104
+	.long	109
+	.long	114
+	.long	119
+	.long	223
+	.long	237
+	.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:0xde DW_TAG_compile_unit
+	.byte	12                              # DW_AT_producer
+	.short	33                              # DW_AT_language
+	.byte	13                              # DW_AT_name
+	.byte	14                              # DW_AT_GNU_dwo_name
+	.quad	-1082921489565291703            # 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:0x59 DW_TAG_subprogram
+	.long	.Ldebug_ranges1-.debug_ranges   # DW_AT_ranges
+	.byte	1                               # DW_AT_frame_base
+	.byte	86
+	.byte	7                               # DW_AT_linkage_name
+	.byte	8                               # 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] 0x8b:0xb DW_TAG_formal_parameter
+	.byte	2                               # DW_AT_location
+	.byte	145
+	.byte	112
+	.byte	9                               # DW_AT_name
+	.byte	1                               # DW_AT_decl_file
+	.byte	14                              # DW_AT_decl_line
+	.long	93                              # DW_AT_type
+	.byte	11                              # Abbrev [11] 0x96:0xb DW_TAG_formal_parameter
+	.byte	2                               # DW_AT_location
+	.byte	145
+	.byte	104
+	.byte	10                              # DW_AT_name
+	.byte	1                               # DW_AT_decl_file
+	.byte	14                              # DW_AT_decl_line
+	.long	213                             # DW_AT_type
+	.byte	12                              # Abbrev [12] 0xa1:0x15 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	14                              # DW_AT_call_column
+	.byte	3                               # Abbrev [3] 0xad: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] 0xb6:0x1e 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	35                              # DW_AT_call_column
+	.byte	3                               # Abbrev [3] 0xc3:0x8 DW_TAG_formal_parameter
+	.byte	2                               # DW_AT_location
+	.byte	145
+	.byte	124
+	.long	107                             # DW_AT_abstract_origin
+	.byte	5                               # Abbrev [5] 0xcb: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] 0xd5:0x5 DW_TAG_pointer_type
+	.long	218                             # DW_AT_type
+	.byte	14                              # Abbrev [14] 0xda:0x5 DW_TAG_pointer_type
+	.long	223                             # DW_AT_type
+	.byte	15                              # Abbrev [15] 0xdf:0x5 DW_TAG_const_type
+	.long	228                             # DW_AT_type
+	.byte	8                               # Abbrev [8] 0xe4:0x4 DW_TAG_base_type
+	.byte	11                              # 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	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	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	_Z12doStuffOtheri.__part.1
+	.quad	_Z12doStuffOtheri.__part.2
+	.quad	.Lfunc_begin0
+	.quad	.Lfunc_begin1
+	.quad	_Z9mainOtheriPPKc.__part.1
+	.quad	_Z9mainOtheriPPKc.__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	"doStuffOther"                  # External Name
+	.long	97                              # DIE offset
+	.byte	48                              # Attributes: FUNCTION, EXTERNAL
+	.asciz	"doStuffOther2"                 # External Name
+	.long	124                             # DIE offset
+	.byte	48                              # Attributes: FUNCTION, EXTERNAL
+	.asciz	"mainOther"                     # 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	228                             # DIE offset
+	.byte	144                             # Attributes: TYPE, STATIC
+	.asciz	"char"                          # External Name
+	.long	0                               # End Mark
+.LpubTypes_end0:
+	.ident	"clang version 19.0.0git (git@github.com:llvm/llvm-project.git df542e1ed82bd4e5a9e345d3a3ae63a76893a0cf)"
+	.section	".note.GNU-stack","",@progbits
+	.addrsig
+	.section	.debug_line,"",@progbits
+.Lline_table_start0:
diff --git a/bolt/test/X86/dwarf4-df-input-lowpc-ranges-cus.test b/bolt/test/X86/dwarf4-df-input-lowpc-ranges-cus.test
new file mode 100644
index 0000000..c9abd02
--- /dev/null
+++ b/bolt/test/X86/dwarf4-df-input-lowpc-ranges-cus.test
@@ -0,0 +1,97 @@
+; 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: llvm-mc -dwarf-version=4 -filetype=obj -triple x86_64-unknown-linux %p/Inputs/dwarf4-df-input-lowpc-ranges-other.s \
+; RUN: -split-dwarf-file=mainOther.dwo -o other.o
+; RUN: %clang %cflags -gdwarf-4 -gsplit-dwarf=split main.o other.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 mainOther.dwo.dwo &> %t/mainddwodwo.txt
+; RUN: cat %t/mainddwodwo.txt | FileCheck -check-prefix=BOLT-DWO-MAIN %s
+
+;; Tests that BOLT correctly handles Skeleton CU which has DW_AT_low_pc/DW_AT_ranges as input and handles multiple CUs with ranges.
+
+; 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-NEXT: 00000110
+; BOLT-NEXT: 00000110
+; BOLT-NEXT: 00000110
+; BOLT-NEXT: 00000110 <End of list>
+; BOLT-NEXT: 00000150
+; BOLT-NEXT: 00000150
+; BOLT-NEXT: 00000150
+; BOLT-NEXT: 00000150 <End of list>
+; BOLT-NEXT: 00000190 [[#%.16x,ADDR8:]] [[#%.16x,ADDRB8:]]
+; BOLT-NEXT: 00000190 [[#%.16x,ADDR9:]] [[#%.16x,ADDRB9:]]
+; BOLT-NEXT: 00000190 [[#%.16x,ADDR10:]] [[#%.16x,ADDRB10:]]
+; BOLT-NEXT: 00000190 [[#%.16x,ADDR11:]] [[#%.16x,ADDRB11:]]
+; BOLT-NEXT: 00000190 [[#%.16x,ADDR12:]] [[#%.16x,ADDRB12:]]
+; BOLT-NEXT: 00000190 [[#%.16x,ADDR13:]] [[#%.16x,ADDRB13:]]
+; BOLT-NEXT: 00000190 [[#%.16x,ADDR14:]] [[#%.16x,ADDRB14:]]
+; BOLT-NEXT: 00000190 <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: DW_TAG_compile_unit
+; BOLT: DW_AT_GNU_dwo_name [DW_FORM_strp] ( .debug_str[0x{{[0-9a-fA-F]+}}] = "mainOther.dwo.dwo")
+; BOLT-NEXT: DW_AT_GNU_dwo_id
+; BOLT-NEXT: DW_AT_GNU_ranges_base [DW_FORM_sec_offset]  (0x00000110)
+; BOLT-NEXT: DW_AT_low_pc [DW_FORM_addr] (0x0000000000000000)
+; BOLT-NEXT: DW_AT_ranges [DW_FORM_sec_offset] (0x00000190
+; BOLT-NEXT: [0x[[#ADDR8]], 0x[[#ADDRB8]])
+; BOLT-NEXT: [0x[[#ADDR9]], 0x[[#ADDRB9]])
+; BOLT-NEXT: [0x[[#ADDR10]], 0x[[#ADDRB10]])
+; BOLT-NEXT: [0x[[#ADDR11]], 0x[[#ADDRB11]])
+; BOLT-NEXT: [0x[[#ADDR12]], 0x[[#ADDRB12]])
+; BOLT-NEXT: [0x[[#ADDR13]], 0x[[#ADDRB13]])
+; BOLT-NEXT: [0x[[#ADDR14]], 0x[[#ADDRB14]])
+; BOLT-NEXT: DW_AT_GNU_addr_base [DW_FORM_sec_offset]  (0x00000018)
+
+; 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-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