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Differential D155033

[BOLT][DWARF] Fix adding DW_AT_GNU_ranges_base
ClosedPublic

Authored by ayermolo on Jul 11 2023, 4:52 PM.

Details

Reviewers
rafauler
Amir
maksfb
jdoerfert
Commits
rG790b75ea3646: [BOLT][DWARF] Fix adding DW_AT_GNU_ranges_base
Summary

There are cases in DWARF4 when Skeleton CU has ranges, but dwo CU doesn't.
Bug was introduced in new DWARFRewriter where for DWARF4 it would fall through
to DWARF5 case.

Diff Detail

Event Timeline

ayermolo created this revision.Jul 11 2023, 4:52 PM
Herald added a reviewer: rafauler. · View Herald TranscriptJul 11 2023, 4:52 PM
Herald added a reviewer: Amir. · View Herald Transcript
Herald added a reviewer: maksfb. · View Herald Transcript
Herald added a project: Restricted Project. · View Herald Transcript
Herald added subscribers: treapster, hoy, modimo, wenlei. · View Herald Transcript
ayermolo requested review of this revision.Jul 11 2023, 4:52 PM
Herald added a reviewer: jdoerfert. · View Herald TranscriptJul 11 2023, 4:52 PM
Herald added a project: Restricted Project. · View Herald Transcript
Herald added subscribers: llvm-commits, jplehr, yota9, sstefan1. · View Herald Transcript
Harbormaster completed remote builds in B244645: Diff 539343.Jul 11 2023, 5:01 PM
maksfb accepted this revision.Jul 12 2023, 11:21 PM
This revision is now accepted and ready to land.Jul 12 2023, 11:21 PM
Closed by commit rG790b75ea3646: [BOLT][DWARF] Fix adding DW_AT_GNU_ranges_base (authored by ayermolo). · Explain WhyJul 13 2023, 10:55 AM
This revision was automatically updated to reflect the committed changes.
ayermolo added a commit: rG790b75ea3646: [BOLT][DWARF] Fix adding DW_AT_GNU_ranges_base.

Revision Contents

PathSize
bolt/
lib/
Rewrite/
2 lines
test/
X86/
Inputs/
284 lines
15 lines

Diff 539343

bolt/lib/Rewrite/DWARFRewriter.cpp

Show First 20 Lines • Show All 1,199 Lines • ▼ Show 20 Lines if (RangesAttrInfo) {
} }
if (!(Die.getTag() == dwarf::DW_TAG_compile_unit || if (!(Die.getTag() == dwarf::DW_TAG_compile_unit ||
Die.getTag() == dwarf::DW_TAG_skeleton_unit)) Die.getTag() == dwarf::DW_TAG_skeleton_unit))
return; return;
// If we are at this point we are in the CU/Skeleton CU, and // If we are at this point we are in the CU/Skeleton CU, and
// DW_AT_GNU_ranges_base or DW_AT_rnglists_base doesn't exist. // DW_AT_GNU_ranges_base or DW_AT_rnglists_base doesn't exist.
if (Unit.getVersion() < 4) if (Unit.getVersion() <= 4)
DIEBldr.addValue(&Die, dwarf::DW_AT_GNU_ranges_base, dwarf::DW_FORM_data4, DIEBldr.addValue(&Die, dwarf::DW_AT_GNU_ranges_base, dwarf::DW_FORM_data4,
DIEInteger(*RangesBase)); DIEInteger(*RangesBase));
else if (Unit.getVersion() == 5) else if (Unit.getVersion() == 5)
DIEBldr.addValue(&Die, dwarf::DW_AT_rnglists_base, DIEBldr.addValue(&Die, dwarf::DW_AT_rnglists_base,
dwarf::DW_FORM_sec_offset, DIEInteger(*RangesBase)); dwarf::DW_FORM_sec_offset, DIEInteger(*RangesBase));
else else
DIEBldr.addValue(&Die, dwarf::DW_AT_rnglists_base, DIEBldr.addValue(&Die, dwarf::DW_AT_rnglists_base,
dwarf::DW_FORM_sec_offset, DIEInteger(*RangesBase)); dwarf::DW_FORM_sec_offset, DIEInteger(*RangesBase));
▲ Show 20 Lines • Show All 929 Lines • Show Last 20 Lines

bolt/test/X86/Inputs/dwarf4-df-no-base.s

  • This file was added.
# int foo() { return 0; }
# int main() { return foo(); }
# clang++ -ffunction-sections -g2 -gdwarf-4 -gsplit-dwarf -S main.cpp
.text
.file "main.cpp"
.section .text._Z3foov,"ax",@progbits
.globl _Z3foov # -- Begin function _Z3foov
.p2align 4, 0x90
.type _Z3foov,@function
_Z3foov: # @_Z3foov
.Lfunc_begin0:
.file 1 "." "main.cpp"
.loc 1 1 0 # main.cpp:1:0
.cfi_startproc
# %bb.0: # %entry
pushq %rbp
.cfi_def_cfa_offset 16
.cfi_offset %rbp, -16
movq %rsp, %rbp
.cfi_def_cfa_register %rbp
.Ltmp0:
.loc 1 1 13 prologue_end # main.cpp:1:13
xorl %eax, %eax
.loc 1 1 13 epilogue_begin is_stmt 0 # main.cpp:1:13
popq %rbp
.cfi_def_cfa %rsp, 8
retq
.Ltmp1:
.Lfunc_end0:
.size _Z3foov, .Lfunc_end0-_Z3foov
.cfi_endproc
# -- End function
.section .text.main,"ax",@progbits
.globl main # -- Begin function main
.p2align 4, 0x90
.type main,@function
main: # @main
.Lfunc_begin1:
.loc 1 2 0 is_stmt 1 # 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
subq $16, %rsp
movl $0, -4(%rbp)
.Ltmp2:
.loc 1 2 21 prologue_end # main.cpp:2:21
callq _Z3foov
.loc 1 2 14 epilogue_begin is_stmt 0 # main.cpp:2:14
addq $16, %rsp
popq %rbp
.cfi_def_cfa %rsp, 8
retq
.Ltmp3:
.Lfunc_end1:
.size main, .Lfunc_end1-main
.cfi_endproc
# -- 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
.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:0x25 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 -252790171939032967 # DW_AT_GNU_dwo_id
.quad 0 # DW_AT_low_pc
.long .Ldebug_ranges0 # DW_AT_ranges
.long .Laddr_table_base0 # DW_AT_GNU_addr_base
.Ldebug_info_end0:
.section .debug_ranges,"",@progbits
.Ldebug_ranges0:
.quad .Lfunc_begin0
.quad .Lfunc_end0
.quad .Lfunc_begin1
.quad .Lfunc_end1
.quad 0
.quad 0
.section .debug_str,"MS",@progbits,1
.Lskel_string0:
.asciz "." # string offset=0
.Lskel_string1:
.asciz "main.dwo" # string offset=58
.section .debug_str.dwo,"eMS",@progbits,1
.Linfo_string0:
.asciz "_Z3foov" # string offset=0
.Linfo_string1:
.asciz "foo" # string offset=8
.Linfo_string2:
.asciz "int" # string offset=12
.Linfo_string3:
.asciz "main" # string offset=16
.Linfo_string4:
.asciz "clang version 17.0.0 (https://github.com/llvm/llvm-project.git 640e07c49037cca41a1bfbeb916b569d8c950aea)" # string offset=21
.Linfo_string5:
.asciz "main.cpp" # string offset=126
.Linfo_string6:
.asciz "main.dwo" # string offset=135
.section .debug_str_offsets.dwo,"e",@progbits
.long 0
.long 8
.long 12
.long 16
.long 21
.long 126
.long 135
.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:0x32 DW_TAG_compile_unit
.byte 4 # DW_AT_producer
.short 33 # DW_AT_language
.byte 5 # DW_AT_name
.byte 6 # DW_AT_GNU_dwo_name
.quad -252790171939032967 # DW_AT_GNU_dwo_id
.byte 2 # Abbrev [2] 0x19:0x10 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 0 # DW_AT_linkage_name
.byte 1 # DW_AT_name
.byte 1 # DW_AT_decl_file
.byte 1 # DW_AT_decl_line
.long 56 # DW_AT_type
# DW_AT_external
.byte 3 # Abbrev [3] 0x29:0xf DW_TAG_subprogram
.byte 1 # DW_AT_low_pc
.long .Lfunc_end1-.Lfunc_begin1 # DW_AT_high_pc
.byte 1 # DW_AT_frame_base
.byte 86
.byte 3 # DW_AT_name
.byte 1 # DW_AT_decl_file
.byte 2 # DW_AT_decl_line
.long 56 # DW_AT_type
# DW_AT_external
.byte 4 # Abbrev [4] 0x38:0x4 DW_TAG_base_type
.byte 2 # DW_AT_name
.byte 5 # DW_AT_encoding
.byte 4 # 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 0 # DW_CHILDREN_no
.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 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 3 # Abbreviation Code
.byte 46 # DW_TAG_subprogram
.byte 0 # DW_CHILDREN_no
.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 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 4 # 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 0 # EOM(3)
.section .debug_addr,"",@progbits
.Laddr_table_base0:
.quad .Lfunc_begin0
.quad .Lfunc_begin1
.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 41 # DIE offset
.byte 48 # Attributes: FUNCTION, EXTERNAL
.asciz "main" # External Name
.long 25 # DIE offset
.byte 48 # Attributes: FUNCTION, EXTERNAL
.asciz "foo" # 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 56 # DIE offset
.byte 144 # Attributes: TYPE, STATIC
.asciz "int" # External Name
.long 0 # End Mark
.LpubTypes_end0:
.ident "clang version 17.0.0 (https://github.com/llvm/llvm-project.git 640e07c49037cca41a1bfbeb916b569d8c950aea)"
.section ".note.GNU-stack","",@progbits
.addrsig
.addrsig_sym _Z3foov
.section .debug_line,"",@progbits
.Lline_table_start0:

bolt/test/X86/dwarf4-df-no-base.test

  • This file was added.
; 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-no-base.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 --debug-info main.exe | FileCheck -check-prefix=PRE-BOLT-MAIN %s
; RUN: llvm-dwarfdump --debug-info main.exe.bolt | FileCheck -check-prefix=BOLT-MAIN %s
; Tests whether we add DW_AT_GNU_ranges_base, if it's not present when Skeleton CU has
; DW_AT_ranges.
; PRE-BOLT-MAIN-NOT: DW_AT_GNU_ranges_base
; BOLT-MAIN: DW_AT_GNU_ranges_base