pdb-global-gc.yaml
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# REQUIRES: x86
# 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 -opt:ref -out:%t.exe -pdb:%t.pdb -verbose
# RUN: llvm-pdbutil dump -symbols -globals %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: Global Symbols
# CHECK-NEXT: ============================================================
# CHECK-NEXT: Records
# CHECK-NEXT: 20 | S_GDATA32 [size = 28] `__wc_mb_cur`
# CHECK-NEXT: type = 0x0070 (char), addr = 0000:0000
# CHECK: Symbols
# CHECK: ============================================================
# CHECK-NEXT: Mod 0000 | `{{.*}}pdb-global-gc.yaml.tmp.obj`:
# CHECK-NEXT: Mod 0001 | `{{.*}}pdb-global-gc.yaml.tmp2.obj`:
# CHECK-NEXT: Error loading module stream 1. The specified stream could not be loaded. Module stream not present
# CHECK-NEXT: 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
...