24129fbc9a
This is a follow up to https://reviews.llvm.org/D104080, and ca3bdb57fa (diff-e64a48fabe31db213a631fdc5f2acb51bdddf3f16a8fb2928784f4c579229585). The implementation of call graph profile was changed from a black box section to relocation approach. This was done to be compatible with post processing tools like strip/objcopy, and llvm equivalent. When they are invoked on object file before the final linking step with this new approach the symbol indices correctness is preserved.
The GNU binutils tools change the REL section to RELA section, unlike llvm tools. For example when strip -S is run on the ELF object files, as an intermediate step before linking. To preserve compatibility this patch extends implementation in LLD and ELFDumper to support both REL and RELA sections for call graph profile.
Reviewed By: MaskRay, jhenderson
Differential Revision: https://reviews.llvm.org/D105217
118 lines
2.8 KiB
Plaintext
118 lines
2.8 KiB
Plaintext
## Under some circumstances, GNU tools strip/objcopy change REL to RELA. https://sourceware.org/bugzilla/show_bug.cgi?id=28035
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## Test that LLD can handle call graph profile data relocated with RELA relocations.
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# REQUIRES: x86
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# RUN: yaml2obj %s -o %t.o
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# RUN: ld.lld %t.o -o %t
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# RUN: llvm-nm --no-sort %t | FileCheck %s
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# RUN: ld.lld --no-call-graph-profile-sort %t.o -o %t
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# RUN: llvm-nm --no-sort %t | FileCheck %s --check-prefix=NO-CG
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# CHECK: 0000000000201124 t D
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# CHECK: 0000000000201122 t C
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# CHECK: 0000000000201128 t B
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# CHECK: 0000000000201120 t A
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# CHECK: 0000000000201126 T _start
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# NO-CG: 0000000000201120 t D
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# NO-CG: 0000000000201122 t C
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# NO-CG: 0000000000201124 t B
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# NO-CG: 0000000000201126 t A
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# NO-CG: 0000000000201128 T _start
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--- !ELF
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FileHeader:
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Class: ELFCLASS64
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Data: ELFDATA2LSB
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Type: ET_REL
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Machine: EM_X86_64
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Sections:
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- Name: .text.D
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Type: SHT_PROGBITS
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Flags: [ SHF_ALLOC, SHF_EXECINSTR ]
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Size: 2
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- Name: .text.C
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Type: SHT_PROGBITS
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Flags: [ SHF_ALLOC, SHF_EXECINSTR ]
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Size: 2
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- Name: .text.B
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Type: SHT_PROGBITS
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Flags: [ SHF_ALLOC, SHF_EXECINSTR ]
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Size: 2
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- Name: .text.A
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Type: SHT_PROGBITS
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Flags: [ SHF_ALLOC, SHF_EXECINSTR ]
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Size: 2
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- Name: .text._start
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Type: SHT_PROGBITS
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Flags: [ SHF_ALLOC, SHF_EXECINSTR ]
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Size: 2
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- Name: .llvm.call-graph-profile
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Type: SHT_LLVM_CALL_GRAPH_PROFILE
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Flags: [ SHF_EXCLUDE ]
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Link: .symtab
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AddressAlign: 0x1
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Entries:
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- Weight: 10
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- Weight: 10
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- Weight: 80
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- Weight: 40
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- Weight: 30
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- Weight: 90
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- Name: .rela.llvm.call-graph-profile
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Type: SHT_RELA
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Info: .llvm.call-graph-profile
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Relocations:
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- Offset: 0x0
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Symbol: A
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Type: R_X86_64_NONE
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- Offset: 0x0
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Symbol: B
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Type: R_X86_64_NONE
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- Offset: 0x8
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Symbol: A
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Type: R_X86_64_NONE
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- Offset: 0x8
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Symbol: B
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Type: R_X86_64_NONE
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- Offset: 0x10
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Symbol: _start
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Type: R_X86_64_NONE
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- Offset: 0x10
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Symbol: B
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Type: R_X86_64_NONE
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- Offset: 0x18
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Symbol: A
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Type: R_X86_64_NONE
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- Offset: 0x18
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Symbol: C
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Type: R_X86_64_NONE
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- Offset: 0x20
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Symbol: B
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Type: R_X86_64_NONE
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- Offset: 0x20
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Symbol: C
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Type: R_X86_64_NONE
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- Offset: 0x28
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Symbol: C
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Type: R_X86_64_NONE
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- Offset: 0x28
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Symbol: D
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Type: R_X86_64_NONE
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Symbols:
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- Name: D
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Type: STT_FUNC
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Section: .text.D
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- Name: C
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Type: STT_FUNC
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Section: .text.C
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- Name: B
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Type: STT_FUNC
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Section: .text.B
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- Name: A
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Type: STT_FUNC
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Section: .text.A
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- Name: _start
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Binding: STB_GLOBAL
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Section: .text._start
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