[BOLT][DWARF] Reuse entries in .debug_addr when not modified

In some binaries produced with ThinLTO there are CUs that share entry in
.debug_addr. Before we would generate a new entry for each. Which lead to binary
size increase. This changes the behavior so that we re-use entries in
.debug_addr.

Reviewed By: maksfb

Differential Revision: https://reviews.llvm.org/D142425

5 files changed, 474 insertions, 0 deletions

diff --git a/bolt/lib/Core/DebugData.cpp b/bolt/lib/Core/DebugData.cpp
index 1cc7cda7b744..a1250177f928 100644
--- a/bolt/lib/Core/DebugData.cpp
+++ b/bolt/lib/Core/DebugData.cpp
@@ -480,6 +480,7 @@ AddressSectionBuffer DebugAddrWriterDwarf5::finalize() {
   DWARFDebugAddrTable AddrTable;
   DIDumpOptions DumpOpts;
   constexpr uint32_t HeaderSize = 8;
+  DenseMap<uint64_t, uint64_t> UnmodifiedAddressOffsets;
   for (std::unique_ptr<DWARFUnit> &CU : BC->DwCtx->compile_units()) {
     const uint64_t CUID = getCUID(*CU.get());
     const uint8_t AddrSize = CU->getAddressByteSize();
@@ -494,11 +495,18 @@ AddressSectionBuffer DebugAddrWriterDwarf5::finalize() {
       // Address base offset is to the first entry.
       // The size of header is 8 bytes.
       uint64_t Offset = *BaseOffset - HeaderSize;
+      auto Iter = UnmodifiedAddressOffsets.find(Offset);
+      if (Iter != UnmodifiedAddressOffsets.end()) {
+        DWOIdToOffsetMap[CUID] = Iter->getSecond();
+        continue;
+      }
+      UnmodifiedAddressOffsets[Offset] = Buffer.size() + HeaderSize;
       if (Error Err = AddrTable.extract(AddrData, &Offset, 5, AddrSize,
                                         DumpOpts.WarningHandler)) {
         DumpOpts.RecoverableErrorHandler(std::move(Err));
         continue;
       }
+
       uint32_t Index = 0;
       for (uint64_t Addr : AddrTable.getAddressEntries())
         AMIter->second.insert(Addr, Index++);
diff --git a/bolt/test/X86/Inputs/dwarf5-helper1-addr-section-reuse.s b/bolt/test/X86/Inputs/dwarf5-helper1-addr-section-reuse.s
new file mode 100644
index 000000000000..6227ebb1daeb
--- /dev/null
+++ b/bolt/test/X86/Inputs/dwarf5-helper1-addr-section-reuse.s
@@ -0,0 +1,144 @@
+	# int foo() {
+  #  return 0;
+  #}
+
+  .text
+	.file	"helper1.cpp"
+	.globl	_Z3foov                         # -- Begin function _Z3foov
+	.p2align	4, 0x90
+	.type	_Z3foov,@function
+_Z3foov:                                # @_Z3foov
+.Lfunc_begin0:
+	.file	0 "testAddr" "helper1.cpp" md5 0xd7d0e6ab5d3b7dbefa5b3fd3cd035697
+	.loc	0 1 0                           # helper1.cpp:1:0
+	.cfi_startproc
+# %bb.0:
+	pushq	%rbp
+	.cfi_def_cfa_offset 16
+	.cfi_offset %rbp, -16
+	movq	%rsp, %rbp
+	.cfi_def_cfa_register %rbp
+.Ltmp0:
+	.loc	0 2 3 prologue_end              # helper1.cpp:2:3
+	xorl	%eax, %eax
+	.loc	0 2 3 epilogue_begin is_stmt 0  # helper1.cpp:2:3
+	popq	%rbp
+	.cfi_def_cfa %rsp, 8
+	retq
+.Ltmp1:
+.Lfunc_end0:
+	.size	_Z3foov, .Lfunc_end0-_Z3foov
+	.cfi_endproc
+                                        # -- End function
+	.section	.debug_abbrev,"",@progbits
+	.byte	1                               # Abbreviation Code
+	.byte	17                              # DW_TAG_compile_unit
+	.byte	1                               # DW_CHILDREN_yes
+	.byte	37                              # DW_AT_producer
+	.byte	37                              # DW_FORM_strx1
+	.byte	19                              # DW_AT_language
+	.byte	5                               # DW_FORM_data2
+	.byte	3                               # DW_AT_name
+	.byte	37                              # DW_FORM_strx1
+	.byte	114                             # DW_AT_str_offsets_base
+	.byte	23                              # DW_FORM_sec_offset
+	.byte	16                              # DW_AT_stmt_list
+	.byte	23                              # DW_FORM_sec_offset
+	.byte	27                              # DW_AT_comp_dir
+	.byte	37                              # DW_FORM_strx1
+	.byte	115                             # DW_AT_addr_base
+	.byte	23                              # DW_FORM_sec_offset
+	.byte	0                               # EOM(1)
+	.byte	0                               # EOM(2)
+	.byte	2                               # Abbreviation Code
+	.byte	46                              # DW_TAG_subprogram
+	.byte	0                               # DW_CHILDREN_no
+	.byte	64                              # DW_AT_frame_base
+	.byte	24                              # DW_FORM_exprloc
+	.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	0                               # EOM(1)
+	.byte	0                               # EOM(2)
+	.byte	3                               # 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	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	1                               # DWARF Unit Type
+	.byte	8                               # Address Size (in bytes)
+	.long	.debug_abbrev                   # Offset Into Abbrev. Section
+	.byte	1                               # Abbrev [1] 0xc:0x2c DW_TAG_compile_unit
+	.byte	0                               # DW_AT_producer
+	.short	33                              # DW_AT_language
+	.byte	1                               # DW_AT_name
+	.long	.Lstr_offsets_base0             # DW_AT_str_offsets_base
+	.long	.Lline_table_start0             # DW_AT_stmt_list
+	.byte	2                               # DW_AT_comp_dir
+	.long	0x8                             # DW_AT_addr_base
+	.byte	2                               # Abbrev [2] 0x23:0x10 DW_TAG_subprogram
+	.byte	1                               # DW_AT_frame_base
+	.byte	86
+	.byte	3                               # DW_AT_linkage_name
+	.byte	4                               # DW_AT_name
+	.byte	0                               # DW_AT_decl_file
+	.byte	1                               # DW_AT_decl_line
+	.long	51                              # DW_AT_type
+                                        # DW_AT_external
+	.byte	3                               # Abbrev [3] 0x33:0x4 DW_TAG_base_type
+	.byte	5                               # DW_AT_name
+	.byte	5                               # DW_AT_encoding
+	.byte	4                               # DW_AT_byte_size
+	.byte	0                               # End Of Children Mark
+.Ldebug_info_end0:
+	.section	.debug_str_offsets,"",@progbits
+	.long	28                              # Length of String Offsets Set
+	.short	5
+	.short	0
+.Lstr_offsets_base0:
+	.section	.debug_str,"MS",@progbits,1
+.Linfo_string0:
+	.asciz	"clang version 15.0.0" # string offset=0
+.Linfo_string1:
+	.asciz	"helper1.cpp"                   # string offset=146
+.Linfo_string2:
+	.asciz	"testAddr" # string offset=158
+.Linfo_string3:
+	.asciz	"_Z3foov"                       # string offset=205
+.Linfo_string4:
+	.asciz	"foo"                           # string offset=213
+.Linfo_string5:
+	.asciz	"int"                           # string offset=217
+	.section	.debug_str_offsets,"",@progbits
+	.long	.Linfo_string0
+	.long	.Linfo_string1
+	.long	.Linfo_string2
+	.long	.Linfo_string3
+	.long	.Linfo_string4
+	.long	.Linfo_string5
+	.ident	"clang version 15.0.0"
+	.section	".note.GNU-stack","",@progbits
+	.addrsig
+	.section	.debug_line,"",@progbits
+.Lline_table_start0:
diff --git a/bolt/test/X86/Inputs/dwarf5-helper2-addr-section-reuse.s b/bolt/test/X86/Inputs/dwarf5-helper2-addr-section-reuse.s
new file mode 100644
index 000000000000..468cb82f0029
--- /dev/null
+++ b/bolt/test/X86/Inputs/dwarf5-helper2-addr-section-reuse.s
@@ -0,0 +1,144 @@
+	# int foo() {
+  #  return 0;
+  #}
+
+  .text
+	.file	"helper2.cpp"
+	.globl	_Z4foo2v                        # -- Begin function _Z4foo2v
+	.p2align	4, 0x90
+	.type	_Z4foo2v,@function
+_Z4foo2v:                               # @_Z4foo2v
+.Lfunc_begin0:
+	.file	0 "testAddr" "helper2.cpp" md5 0xd625613508584d1558af439616b0e2d3
+	.loc	0 1 0                           # helper2.cpp:1:0
+	.cfi_startproc
+# %bb.0:
+	pushq	%rbp
+	.cfi_def_cfa_offset 16
+	.cfi_offset %rbp, -16
+	movq	%rsp, %rbp
+	.cfi_def_cfa_register %rbp
+.Ltmp0:
+	.loc	0 2 3 prologue_end              # helper2.cpp:2:3
+	xorl	%eax, %eax
+	.loc	0 2 3 epilogue_begin is_stmt 0  # helper2.cpp:2:3
+	popq	%rbp
+	.cfi_def_cfa %rsp, 8
+	retq
+.Ltmp1:
+.Lfunc_end0:
+	.size	_Z4foo2v, .Lfunc_end0-_Z4foo2v
+	.cfi_endproc
+                                        # -- End function
+	.section	.debug_abbrev,"",@progbits
+	.byte	1                               # Abbreviation Code
+	.byte	17                              # DW_TAG_compile_unit
+	.byte	1                               # DW_CHILDREN_yes
+	.byte	37                              # DW_AT_producer
+	.byte	37                              # DW_FORM_strx1
+	.byte	19                              # DW_AT_language
+	.byte	5                               # DW_FORM_data2
+	.byte	3                               # DW_AT_name
+	.byte	37                              # DW_FORM_strx1
+	.byte	114                             # DW_AT_str_offsets_base
+	.byte	23                              # DW_FORM_sec_offset
+	.byte	16                              # DW_AT_stmt_list
+	.byte	23                              # DW_FORM_sec_offset
+	.byte	27                              # DW_AT_comp_dir
+	.byte	37                              # DW_FORM_strx1
+	.byte	115                             # DW_AT_addr_base
+	.byte	23                              # DW_FORM_sec_offset
+	.byte	0                               # EOM(1)
+	.byte	0                               # EOM(2)
+	.byte	2                               # Abbreviation Code
+	.byte	46                              # DW_TAG_subprogram
+	.byte	0                               # DW_CHILDREN_no
+	.byte	64                              # DW_AT_frame_base
+	.byte	24                              # DW_FORM_exprloc
+	.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	0                               # EOM(1)
+	.byte	0                               # EOM(2)
+	.byte	3                               # 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	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	1                               # DWARF Unit Type
+	.byte	8                               # Address Size (in bytes)
+	.long	.debug_abbrev                   # Offset Into Abbrev. Section
+	.byte	1                               # Abbrev [1] 0xc:0x2c DW_TAG_compile_unit
+	.byte	0                               # DW_AT_producer
+	.short	33                              # DW_AT_language
+	.byte	1                               # DW_AT_name
+	.long	.Lstr_offsets_base0             # DW_AT_str_offsets_base
+	.long	.Lline_table_start0             # DW_AT_stmt_list
+	.byte	2                               # DW_AT_comp_dir
+	.long	0x8                             # DW_AT_addr_base
+	.byte	2                               # Abbrev [2] 0x23:0x10 DW_TAG_subprogram
+	.byte	1                               # DW_AT_frame_base
+	.byte	86
+	.byte	3                               # DW_AT_linkage_name
+	.byte	4                               # DW_AT_name
+	.byte	0                               # DW_AT_decl_file
+	.byte	1                               # DW_AT_decl_line
+	.long	51                              # DW_AT_type
+                                        # DW_AT_external
+	.byte	3                               # Abbrev [3] 0x33:0x4 DW_TAG_base_type
+	.byte	5                               # DW_AT_name
+	.byte	5                               # DW_AT_encoding
+	.byte	4                               # DW_AT_byte_size
+	.byte	0                               # End Of Children Mark
+.Ldebug_info_end0:
+	.section	.debug_str_offsets,"",@progbits
+	.long	28                              # Length of String Offsets Set
+	.short	5
+	.short	0
+.Lstr_offsets_base0:
+	.section	.debug_str,"MS",@progbits,1
+.Linfo_string0:
+	.asciz	"clang version 15.0.0" # string offset=0
+.Linfo_string1:
+	.asciz	"helper2.cpp"                   # string offset=146
+.Linfo_string2:
+	.asciz	"testAddr" # string offset=158
+.Linfo_string3:
+	.asciz	"_Z4foo2v"                      # string offset=205
+.Linfo_string4:
+	.asciz	"foo2"                          # string offset=214
+.Linfo_string5:
+	.asciz	"int"                           # string offset=219
+	.section	.debug_str_offsets,"",@progbits
+	.long	.Linfo_string0
+	.long	.Linfo_string1
+	.long	.Linfo_string2
+	.long	.Linfo_string3
+	.long	.Linfo_string4
+	.long	.Linfo_string5
+	.ident	"clang version 15.0.0"
+	.section	".note.GNU-stack","",@progbits
+	.addrsig
+	.section	.debug_line,"",@progbits
+.Lline_table_start0:
diff --git a/bolt/test/X86/Inputs/dwarf5-main-addr-section-reuse.s b/bolt/test/X86/Inputs/dwarf5-main-addr-section-reuse.s
new file mode 100644
index 000000000000..c2738eadea9a
--- /dev/null
+++ b/bolt/test/X86/Inputs/dwarf5-main-addr-section-reuse.s
@@ -0,0 +1,160 @@
+	#int  main() {
+  #  return 0;
+  #}
+
+  .text
+	.file	"main.cpp"
+	.globl	main                            # -- Begin function main
+	.p2align	4, 0x90
+	.type	main,@function
+main:                                   # @main
+.Lfunc_begin0:
+	.file	0 "testAddr" "main.cpp" md5 0xd7b10b0a4a7fb8e0790feb7a5cd9b69a
+	.loc	0 1 0                           # main.cpp:1:0
+	.cfi_startproc
+# %bb.0:
+	pushq	%rbp
+	.cfi_def_cfa_offset 16
+	.cfi_offset %rbp, -16
+	movq	%rsp, %rbp
+	.cfi_def_cfa_register %rbp
+	movl	$0, -4(%rbp)
+.Ltmp0:
+	.loc	0 2 3 prologue_end              # main.cpp:2:3
+	xorl	%eax, %eax
+	.loc	0 2 3 epilogue_begin is_stmt 0  # main.cpp:2:3
+	popq	%rbp
+	.cfi_def_cfa %rsp, 8
+	retq
+.Ltmp1:
+.Lfunc_end0:
+	.size	main, .Lfunc_end0-main
+	.cfi_endproc
+                                        # -- End function
+	.section	.debug_abbrev,"",@progbits
+	.byte	1                               # Abbreviation Code
+	.byte	17                              # DW_TAG_compile_unit
+	.byte	1                               # DW_CHILDREN_yes
+	.byte	37                              # DW_AT_producer
+	.byte	37                              # DW_FORM_strx1
+	.byte	19                              # DW_AT_language
+	.byte	5                               # DW_FORM_data2
+	.byte	3                               # DW_AT_name
+	.byte	37                              # DW_FORM_strx1
+	.byte	114                             # DW_AT_str_offsets_base
+	.byte	23                              # DW_FORM_sec_offset
+	.byte	16                              # DW_AT_stmt_list
+	.byte	23                              # DW_FORM_sec_offset
+	.byte	27                              # DW_AT_comp_dir
+	.byte	37                              # DW_FORM_strx1
+	.byte	17                              # DW_AT_low_pc
+	.byte	27                              # DW_FORM_addrx
+	.byte	18                              # DW_AT_high_pc
+	.byte	6                               # DW_FORM_data4
+	.byte	115                             # DW_AT_addr_base
+	.byte	23                              # DW_FORM_sec_offset
+	.byte	0                               # EOM(1)
+	.byte	0                               # EOM(2)
+	.byte	2                               # Abbreviation Code
+	.byte	46                              # DW_TAG_subprogram
+	.byte	0                               # DW_CHILDREN_no
+	.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	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	3                               # 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	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	1                               # DWARF Unit Type
+	.byte	8                               # Address Size (in bytes)
+	.long	.debug_abbrev                   # Offset Into Abbrev. Section
+	.byte	1                               # Abbrev [1] 0xc:0x2b DW_TAG_compile_unit
+	.byte	0                               # DW_AT_producer
+	.short	33                              # DW_AT_language
+	.byte	1                               # DW_AT_name
+	.long	.Lstr_offsets_base0             # DW_AT_str_offsets_base
+	.long	.Lline_table_start0             # DW_AT_stmt_list
+	.byte	2                               # DW_AT_comp_dir
+	.byte	0                               # DW_AT_low_pc
+	.long	.Lfunc_end0-.Lfunc_begin0       # DW_AT_high_pc
+	.long	.Laddr_table_base0              # DW_AT_addr_base
+	.byte	2                               # Abbrev [2] 0x23:0xf DW_TAG_subprogram
+	.byte	0                               # DW_AT_low_pc
+	.long	.Lfunc_end0-.Lfunc_begin0       # DW_AT_high_pc
+	.byte	1                               # DW_AT_frame_base
+	.byte	86
+	.byte	3                               # DW_AT_name
+	.byte	0                               # DW_AT_decl_file
+	.byte	1                               # DW_AT_decl_line
+	.long	50                              # DW_AT_type
+                                        # DW_AT_external
+	.byte	3                               # Abbrev [3] 0x32:0x4 DW_TAG_base_type
+	.byte	4                               # DW_AT_name
+	.byte	5                               # DW_AT_encoding
+	.byte	4                               # DW_AT_byte_size
+	.byte	0                               # End Of Children Mark
+.Ldebug_info_end0:
+	.section	.debug_str_offsets,"",@progbits
+	.long	24                              # Length of String Offsets Set
+	.short	5
+	.short	0
+.Lstr_offsets_base0:
+	.section	.debug_str,"MS",@progbits,1
+.Linfo_string0:
+	.asciz	"clang version 15.0.0" # string offset=0
+.Linfo_string1:
+	.asciz	"main.cpp"                      # string offset=146
+.Linfo_string2:
+	.asciz	"testAddr" # string offset=155
+.Linfo_string3:
+	.asciz	"main"                          # string offset=202
+.Linfo_string4:
+	.asciz	"int"                           # string offset=207
+	.section	.debug_str_offsets,"",@progbits
+	.long	.Linfo_string0
+	.long	.Linfo_string1
+	.long	.Linfo_string2
+	.long	.Linfo_string3
+	.long	.Linfo_string4
+	.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	.Lfunc_begin0
+.Ldebug_addr_end0:
+	.ident	"clang version 15.0.0"
+	.section	".note.GNU-stack","",@progbits
+	.addrsig
+	.section	.debug_line,"",@progbits
+.Lline_table_start0:
diff --git a/bolt/test/X86/dwarf5-addr-section-reuse.s b/bolt/test/X86/dwarf5-addr-section-reuse.s
new file mode 100644
index 000000000000..bc747e0657b5
--- /dev/null
+++ b/bolt/test/X86/dwarf5-addr-section-reuse.s
@@ -0,0 +1,18 @@
+# RUN: llvm-mc -dwarf-version=5 -filetype=obj -triple x86_64-unknown-linux %p/Inputs/dwarf5-main-addr-section-reuse.s    -o %tmain.o
+# RUN: llvm-mc -dwarf-version=5 -filetype=obj -triple x86_64-unknown-linux %p/Inputs/dwarf5-helper1-addr-section-reuse.s -o %thelper1.o
+# RUN: llvm-mc -dwarf-version=5 -filetype=obj -triple x86_64-unknown-linux %p/Inputs/dwarf5-helper2-addr-section-reuse.s -o %thelper2.o
+# RUN: %clang %cflags -dwarf-5 %tmain.o %thelper1.o %thelper2.o -o %t.exe -Wl,-q
+# RUN: llvm-dwarfdump --debug-info %t.exe | FileCheck --check-prefix=PRECHECK %s
+# RUN: llvm-bolt %t.exe -o %t.exe.bolt --update-debug-sections
+# RUN: llvm-dwarfdump --debug-info %t.exe.bolt | FileCheck --check-prefix=POSTCHECK %s
+
+# This test checks that when a binary is bolted if CU is not modified and has DW_AT_addr_base that is shared
+# after being bolted CUs still share same entry in .debug_addr.
+
+# PRECHECK: DW_AT_addr_base (0x00000008)
+# PRECHECK: DW_AT_addr_base (0x00000008)
+# PRECHECK: DW_AT_addr_base (0x00000008)
+
+# POSTCHECK: DW_AT_addr_base (0x00000008)
+# POSTCHECK: DW_AT_addr_base (0x00000020)
+# POSTCHECK: DW_AT_addr_base (0x00000020)