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llvm-project/lld/test/COFF/pdb-global-gc.yaml

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[COFF] Allow debug info to relocate against discarded symbols Summary: In order to do this without switching on the symbol kind multiple times, I created Defined::getChunkAndOffset and use that instead of SymbolBody::getRVA in the inner relocation loop. Now we get the symbol's chunk before switching over relocation types, so we can test if it has been discarded outside the inner relocation type switch. This also simplifies application of section relative relocations. Previously we would switch on symbol kind to compute the RVA, then the relocation type, and then the symbol kind again to get the output section so we could subtract that from the symbol RVA. Now we *always* have an OutputSection, so applying SECREL and SECTION relocations isn't as much of a special case. I'm still not quite happy with the cleanliness of this code. I'm not sure what offsets and bases we should be using during the relocation processing loop: VA, RVA, or OutputSectionOffset. Reviewers: ruiu, pcc Reviewed By: ruiu Subscribers: majnemer, inglorion, llvm-commits, aprantl Differential Revision: https://reviews.llvm.org/D34650 llvm-svn: 306566
2017-06-29 01:06:35 +08:00
# RUN: yaml2obj %s -o %t.obj
# RUN: llvm-mc %S/Inputs/pdb-global-gc.s -triple x86_64-windows-msvc -filetype=obj -o %t2.obj
# RUN: lld-link %t.obj %t2.obj -debug -entry:main \
# RUN: -nodefaultlib -debug -out:%t.exe -pdb:%t.pdb -verbose
# RUN: llvm-pdbutil dump -symbols %t.pdb | FileCheck %s
# This tests the case where an __imp_ chunk is discarded by linker GC. The debug
# info may refer to the __imp_ symbol still.
# Compile this code with MSVC to regenerate the test case:
# extern char __declspec(dllimport) __wc_mb_cur;
# int discarded() { return __wc_mb_cur; }
# int main() { return g2; }
# CHECK: Symbols
# CHECK: ============================================================
# CHECK: Mod 0000 | `{{.*}}pdb-global-gc.yaml.tmp.obj`:
# CHECK: - S_GDATA32 [size = 28] `__wc_mb_cur`
# CHECK-NEXT: type = 0x0070 (char), addr = 0000:0000
# CHECK: Mod 0001 | `{{.*}}pdb-global-gc.yaml.tmp2.obj`:
# CHECK: Mod 0002 | `* Linker *`:
--- !COFF
header:
Machine: IMAGE_FILE_MACHINE_AMD64
Characteristics: [ ]
sections:
- Name: '.debug$S'
Characteristics: [ IMAGE_SCN_CNT_INITIALIZED_DATA, IMAGE_SCN_MEM_DISCARDABLE, IMAGE_SCN_MEM_READ ]
Alignment: 1
Subsections:
- !Symbols
Records:
- Kind: S_GDATA32
DataSym:
Type: 112
DisplayName: __wc_mb_cur
- !StringTable
Strings:
Relocations:
- VirtualAddress: 20
SymbolName: __wc_mb_cur
Type: IMAGE_REL_AMD64_SECREL
- VirtualAddress: 24
SymbolName: __wc_mb_cur
Type: IMAGE_REL_AMD64_SECTION
- Name: '.text$mn'
Characteristics: [ IMAGE_SCN_CNT_CODE, IMAGE_SCN_LNK_COMDAT, IMAGE_SCN_MEM_EXECUTE, IMAGE_SCN_MEM_READ ]
Alignment: 16
SectionData: 0FBE0500000000C3
Relocations:
- VirtualAddress: 3
SymbolName: __wc_mb_cur
Type: IMAGE_REL_AMD64_REL32
- Name: '.text$mn'
Characteristics: [ IMAGE_SCN_CNT_CODE, IMAGE_SCN_LNK_COMDAT, IMAGE_SCN_MEM_EXECUTE, IMAGE_SCN_MEM_READ ]
Alignment: 16
SectionData: B82A000000C3
symbols:
- Name: '.debug$S'
Value: 0
SectionNumber: 1
SimpleType: IMAGE_SYM_TYPE_NULL
ComplexType: IMAGE_SYM_DTYPE_NULL
StorageClass: IMAGE_SYM_CLASS_STATIC
SectionDefinition:
Length: 240
NumberOfRelocations: 2
NumberOfLinenumbers: 0
CheckSum: 0
Number: 0
- Name: '.text$mn'
Value: 0
SectionNumber: 2
SimpleType: IMAGE_SYM_TYPE_NULL
ComplexType: IMAGE_SYM_DTYPE_NULL
StorageClass: IMAGE_SYM_CLASS_STATIC
SectionDefinition:
Length: 11
NumberOfRelocations: 1
NumberOfLinenumbers: 0
CheckSum: 2906070869
Number: 0
Selection: IMAGE_COMDAT_SELECT_NODUPLICATES
- Name: '.text$mn'
Value: 0
SectionNumber: 3
SimpleType: IMAGE_SYM_TYPE_NULL
ComplexType: IMAGE_SYM_DTYPE_NULL
StorageClass: IMAGE_SYM_CLASS_STATIC
SectionDefinition:
Length: 6
NumberOfRelocations: 0
NumberOfLinenumbers: 0
CheckSum: 2139436471
Number: 0
Selection: IMAGE_COMDAT_SELECT_NODUPLICATES
- Name: discarded
Value: 0
SectionNumber: 2
SimpleType: IMAGE_SYM_TYPE_NULL
ComplexType: IMAGE_SYM_DTYPE_FUNCTION
StorageClass: IMAGE_SYM_CLASS_EXTERNAL
- Name: main
Value: 0
SectionNumber: 3
SimpleType: IMAGE_SYM_TYPE_NULL
ComplexType: IMAGE_SYM_DTYPE_FUNCTION
StorageClass: IMAGE_SYM_CLASS_EXTERNAL
- Name: __wc_mb_cur
Value: 0
SectionNumber: 0
SimpleType: IMAGE_SYM_TYPE_NULL
ComplexType: IMAGE_SYM_DTYPE_NULL
StorageClass: IMAGE_SYM_CLASS_EXTERNAL
...