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clang-p2996/llvm/test/tools/llvm-readobj/ELF/call-graph-profile.test
Alexander Yermolovich 24129fbc9a [LLD] Adding support for RELA for CG Profile. 
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
2021-07-13 13:56:30 -07:00

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## This test checks how we handle the --elf-cg-profile option.
# RUN: yaml2obj %s -o %t.o
# RUN: llvm-readobj %t.o --cg-profile | FileCheck %s --check-prefix=LLVM
# RUN: llvm-readelf %t.o --cg-profile | FileCheck %s --check-prefix=GNU
# RUN: llvm-readobj %t.o --elf-cg-profile | FileCheck %s --check-prefix=LLVM
# RUN: llvm-readelf %t.o --elf-cg-profile | FileCheck %s --check-prefix=GNU
# LLVM: CGProfile [
# LLVM-NEXT: CGProfileEntry {
# LLVM-NEXT: From: foo (1)
# LLVM-NEXT: To: bar (2)
# LLVM-NEXT: Weight: 89
# LLVM-NEXT: }
# LLVM-NEXT: CGProfileEntry {
# LLVM-NEXT: From: bar (2)
# LLVM-NEXT: To: foo (1)
# LLVM-NEXT: Weight: 98
# LLVM-NEXT: }
# LLVM-NEXT: ]
# GNU: GNUStyle::printCGProfile not implemented
--- !ELF
FileHeader:
Class: ELFCLASS64
Data: ELFDATA2LSB
Type: ET_DYN
Machine: EM_X86_64
Sections:
- Name: .llvm.call-graph-profile
Type: SHT_LLVM_CALL_GRAPH_PROFILE
Entries:
- Weight: 89
- Weight: 98
EntSize: [[ENTSIZE=<none>]]
- Name: .rel.llvm.call-graph-profile
Type: SHT_REL
Info: .llvm.call-graph-profile
Relocations:
- Symbol: foo
Type: R_X86_64_NONE
- Offset: 0x0
Symbol: bar
Type: R_X86_64_NONE
- Offset: 0x8
Symbol: bar
Type: R_X86_64_NONE
- Offset: 0x8
Symbol: foo
Type: R_X86_64_NONE
Symbols:
- Name: foo
- Name: bar
## Check we report a warning when unable to get the content of the SHT_LLVM_CALL_GRAPH_PROFILE section.
# RUN: yaml2obj %s -DENTSIZE=0xF -o %t2.o
# RUN: llvm-readobj %t2.o --cg-profile 2>&1 | FileCheck %s -DFILE=%t2.o --check-prefix=LLVM-ERR
# RUN: llvm-readelf %t2.o --cg-profile | FileCheck %s --check-prefix=GNU
# LLVM-ERR: warning: '[[FILE]]': unable to load the SHT_LLVM_CALL_GRAPH_PROFILE section: section [index 1] has invalid sh_entsize: expected 8, but got 15
## Check we report a warning when unable to dump a name of a symbol.
# RUN: yaml2obj %s --docnum=2 -o %t3.o
# RUN: llvm-readobj %t3.o --cg-profile 2>&1 | FileCheck %s -DFILE=%t3.o --check-prefix=LLVM-BROKEN-SYM
# RUN: llvm-readelf %t3.o --cg-profile | FileCheck %s --check-prefix=GNU
# LLVM-BROKEN-SYM: CGProfile [
# LLVM-BROKEN-SYM-NEXT: CGProfileEntry {
# LLVM-BROKEN-SYM-NEXT: From: A (1)
# LLVM-BROKEN-SYM-NEXT: warning: '[[FILE]]': unable to read the name of symbol with index 2: st_name (0xff) is past the end of the string table of size 0x5
# LLVM-BROKEN-SYM-NEXT: To: <?> (2)
# LLVM-BROKEN-SYM-NEXT: Weight: 10
# LLVM-BROKEN-SYM-NEXT: }
# LLVM-BROKEN-SYM-NEXT: CGProfileEntry {
# LLVM-BROKEN-SYM-NEXT: From: <?> (2)
# LLVM-BROKEN-SYM-NEXT: To: B (3)
# LLVM-BROKEN-SYM-NEXT: Weight: 20
# LLVM-BROKEN-SYM-NEXT: }
# LLVM-BROKEN-SYM-NEXT: CGProfileEntry {
# LLVM-BROKEN-SYM-NEXT: From: (0)
# LLVM-BROKEN-SYM-NEXT: warning: '[[FILE]]': unable to read the name of symbol with index 4: unable to get symbol from section [index 4]: invalid symbol index (4)
# LLVM-BROKEN-SYM-NEXT: To: <?> (4)
# LLVM-BROKEN-SYM-NEXT: Weight: 20
# LLVM-BROKEN-SYM-NEXT: }
# LLVM-BROKEN-SYM-NEXT: ]
--- !ELF
FileHeader:
Class: ELFCLASS64
Data: ELFDATA2LSB
Type: ET_DYN
Machine: EM_X86_64
Sections:
- Name: .llvm.call-graph-profile
Type: SHT_LLVM_CALL_GRAPH_PROFILE
Entries:
- Weight: 10
- Weight: 20
- Weight: 20
- Name: .rel.llvm.call-graph-profile
Type: SHT_REL
Info: .llvm.call-graph-profile
Relocations:
- Symbol: 1
Type: R_X86_64_NONE
- Offset: 0x0
Symbol: 2
Type: R_X86_64_NONE
- Offset: 0x8
Symbol: 2
Type: R_X86_64_NONE
- Offset: 0x8
Symbol: 3
Type: R_X86_64_NONE
- Offset: 0x10
Symbol: 0x0 ## Null symbol.
Type: R_X86_64_NONE
- Offset: 0x10
Symbol: 0x4 ## This index goes past the end of the symbol table.
Type: R_X86_64_NONE
- Name: .strtab
Type: SHT_STRTAB
Content: "0041004200" ## '\0', 'A', '\0', 'B', '\0'
Symbols:
- StName: 1 ## 'A'
- StName: 0xFF ## An arbitrary currupted index in the string table.
- StName: 3 ## 'B'
## Check we report a warning when a relocation section is not present.
# RUN: yaml2obj %s --docnum=3 -o %t4.o
# RUN: llvm-readobj %t4.o --cg-profile 2>&1 | FileCheck %s -DFILE=%t4.o --check-prefix=LLVM-NO-RELOC
# RUN: llvm-readobj %t4.o --elf-cg-profile 2>&1 | FileCheck %s -DFILE=%t4.o --check-prefix=LLVM-NO-RELOC
# LLVM-NO-RELOC: warning: '[[FILE]]': relocation section for a call graph section doesn't exist
# LLVM-NO-RELOC-NEXT: CGProfile [
# LLVM-NO-RELOC-NEXT: CGProfileEntry {
# LLVM-NO-RELOC-NEXT: Weight: 89
# LLVM-NO-RELOC-NEXT: }
# LLVM-NO-RELOC-NEXT: CGProfileEntry {
# LLVM-NO-RELOC-NEXT: Weight: 98
# LLVM-NO-RELOC-NEXT: }
# LLVM-NO-RELOC-NEXT: ]
--- !ELF
FileHeader:
Class: ELFCLASS64
Data: ELFDATA2LSB
Type: ET_DYN
Sections:
- Name: .llvm.call-graph-profile
Type: SHT_LLVM_CALL_GRAPH_PROFILE
Entries:
- Weight: 89
- Weight: 98
Symbols:
- Name: foo
- Name: bar
## Check we report a warning when the number of relocation section entries does not match the number of call graph entries.
# RUN: yaml2obj %s --docnum=4 -o %t5.o
# RUN: llvm-readobj %t5.o --cg-profile 2>&1 | FileCheck %s -DFILE=%t5.o --check-prefix=LLVM-RELOC-GRAPH-NOT-MATCH
# RUN: llvm-readobj %t5.o --elf-cg-profile 2>&1 | FileCheck %s -DFILE=%t5.o --check-prefix=LLVM-RELOC-GRAPH-NOT-MATCH
# LLVM-RELOC-GRAPH-NOT-MATCH: warning: '[[FILE]]': number of from/to pairs does not match number of frequencies
# LLVM-RELOC-GRAPH-NOT-MATCH-NEXT: CGProfile [
# LLVM-RELOC-GRAPH-NOT-MATCH-NEXT: CGProfileEntry {
# LLVM-RELOC-GRAPH-NOT-MATCH-NEXT: Weight: 89
# LLVM-RELOC-GRAPH-NOT-MATCH-NEXT: }
# LLVM-RELOC-GRAPH-NOT-MATCH-NEXT: CGProfileEntry {
# LLVM-RELOC-GRAPH-NOT-MATCH-NEXT: Weight: 98
# LLVM-RELOC-GRAPH-NOT-MATCH-NEXT: }
# LLVM-RELOC-GRAPH-NOT-MATCH-NEXT: ]
--- !ELF
FileHeader:
Class: ELFCLASS64
Data: ELFDATA2LSB
Type: ET_DYN
Machine: EM_X86_64
Sections:
- Name: .llvm.call-graph-profile
Type: SHT_LLVM_CALL_GRAPH_PROFILE
Entries:
- Weight: 89
- Weight: 98
- Name: .rel.llvm.call-graph-profile
Type: SHT_REL
Info: .llvm.call-graph-profile
Relocations:
- Symbol: foo
Type: R_X86_64_NONE
- Offset: 0x0
Symbol: bar
Type: R_X86_64_NONE
- Offset: 0x8
Symbol: bar
Type: R_X86_64_NONE
- Offset: 0x8
Symbol: foo
Type: R_X86_64_NONE
- Offset: 0x10
Symbol: foo
Type: R_X86_64_NONE
Symbols:
- Name: foo
- Name: bar
## Check we report a warning when a REL relocation section can't be loaded.
# RUN: yaml2obj %s --docnum=5 -o %t6.o
# RUN: llvm-readobj %t6.o --cg-profile 2>&1 | FileCheck %s -DFILE=%t6.o --check-prefix=LLVM-RELOC-WRONG-SIZE
# RUN: llvm-readobj %t6.o --elf-cg-profile 2>&1 | FileCheck %s -DFILE=%t6.o --check-prefix=LLVM-RELOC-WRONG-SIZE
# LLVM-RELOC-WRONG-SIZE: warning: '[[FILE]]': unable to load relocations for SHT_LLVM_CALL_GRAPH_PROFILE section: section [index 2] has invalid sh_entsize: expected 16, but got 24
# LLVM-RELOC-WRONG-SIZE-NEXT: CGProfile [
# LLVM-RELOC-WRONG-SIZE-NEXT: CGProfileEntry {
# LLVM-RELOC-WRONG-SIZE-NEXT: Weight: 89
# LLVM-RELOC-WRONG-SIZE-NEXT: }
# LLVM-RELOC-WRONG-SIZE-NEXT: CGProfileEntry {
# LLVM-RELOC-WRONG-SIZE-NEXT: Weight: 98
# LLVM-RELOC-WRONG-SIZE-NEXT: }
# LLVM-RELOC-WRONG-SIZE-NEXT: ]
--- !ELF
FileHeader:
Class: ELFCLASS64
Data: ELFDATA2LSB
Type: ET_DYN
Machine: EM_X86_64
Sections:
- Name: .llvm.call-graph-profile
Type: SHT_LLVM_CALL_GRAPH_PROFILE
Entries:
- Weight: 89
- Weight: 98
- Name: .rel.llvm.call-graph-profile
Type: SHT_REL
Info: .llvm.call-graph-profile
Relocations:
- Symbol: foo
Type: R_X86_64_NONE
- Offset: 0x0
Symbol: bar
Type: R_X86_64_NONE
- Offset: 0x8
Symbol: bar
Type: R_X86_64_NONE
- Offset: 0x8
Symbol: foo
Type: R_X86_64_NONE
EntSize: 24
Symbols:
- Name: foo
- Name: bar
## GNU strip may convert SHT_REL to SHT_RELA. Test we can handle SHT_RELA.
# RUN: yaml2obj %s --docnum=6 -o %t7.o
# RUN: llvm-readobj %t7.o --cg-profile | FileCheck %s --check-prefix=LLVM-RELA
# RUN: llvm-readelf %t7.o --cg-profile | FileCheck %s --check-prefix=GNU-RELA
# LLVM-RELA: CGProfile [
# LLVM-RELA-NEXT: CGProfileEntry {
# LLVM-RELA-NEXT: From: foo (1)
# LLVM-RELA-NEXT: To: bar (2)
# LLVM-RELA-NEXT: Weight: 89
# LLVM-RELA-NEXT: }
# LLVM-RELA-NEXT: CGProfileEntry {
# LLVM-RELA-NEXT: From: bar (2)
# LLVM-RELA-NEXT: To: foo (1)
# LLVM-RELA-NEXT: Weight: 98
# LLVM-RELA-NEXT: }
# LLVM-RELA-NEXT: ]
# GNU-RELA: GNUStyle::printCGProfile not implemented
--- !ELF
FileHeader:
Class: ELFCLASS64
Data: ELFDATA2LSB
Type: ET_DYN
Machine: EM_X86_64
Sections:
- Name: .llvm.call-graph-profile
Type: SHT_LLVM_CALL_GRAPH_PROFILE
Entries:
- Weight: 89
- Weight: 98
- Name: .rela.llvm.call-graph-profile
Type: SHT_RELA
Info: .llvm.call-graph-profile
Relocations:
- Symbol: foo
Type: R_X86_64_NONE
- Offset: 0x0
Symbol: bar
Type: R_X86_64_NONE
- Offset: 0x8
Symbol: bar
Type: R_X86_64_NONE
- Offset: 0x8
Symbol: foo
Type: R_X86_64_NONE
Symbols:
- Name: foo
- Name: bar
## Check we report a warning when a RELA relocation section can't be loaded.
# RUN: yaml2obj %s --docnum=7 -o %t8.o
# RUN: llvm-readobj %t8.o --cg-profile 2>&1 | FileCheck %s -DFILE=%t8.o --check-prefix=LLVM-RELOC-WRONG-SIZE-RELA
# RUN: llvm-readobj %t8.o --elf-cg-profile 2>&1 | FileCheck %s -DFILE=%t8.o --check-prefix=LLVM-RELOC-WRONG-SIZE-RELA
# LLVM-RELOC-WRONG-SIZE-RELA: warning: '[[FILE]]': unable to load relocations for SHT_LLVM_CALL_GRAPH_PROFILE section: section [index 2] has invalid sh_entsize: expected 24, but got 16
# LLVM-RELOC-WRONG-SIZE-RELA-NEXT: CGProfile [
# LLVM-RELOC-WRONG-SIZE-RELA-NEXT: CGProfileEntry {
# LLVM-RELOC-WRONG-SIZE-RELA-NEXT: Weight: 89
# LLVM-RELOC-WRONG-SIZE-RELA-NEXT: }
# LLVM-RELOC-WRONG-SIZE-RELA-NEXT: CGProfileEntry {
# LLVM-RELOC-WRONG-SIZE-RELA-NEXT: Weight: 98
# LLVM-RELOC-WRONG-SIZE-RELA-NEXT: }
# LLVM-RELOC-WRONG-SIZE-RELA-NEXT: ]
--- !ELF
FileHeader:
Class: ELFCLASS64
Data: ELFDATA2LSB
Type: ET_DYN
Machine: EM_X86_64
Sections:
- Name: .llvm.call-graph-profile
Type: SHT_LLVM_CALL_GRAPH_PROFILE
Entries:
- Weight: 89
- Weight: 98
- Name: .rela.llvm.call-graph-profile
Type: SHT_RELA
Info: .llvm.call-graph-profile
Relocations:
- Symbol: foo
Type: R_X86_64_NONE
- Offset: 0x0
Symbol: bar
Type: R_X86_64_NONE
- Offset: 0x8
Symbol: bar
Type: R_X86_64_NONE
- Offset: 0x8
Symbol: foo
Type: R_X86_64_NONE
EntSize: 16
Symbols:
- Name: foo
- Name: bar
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