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llvm-project/lld/test/COFF/common-alignment.test

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[COFF] Add support for aligncomm directives These are emitted for comm symbols in object files, when targeting a GNU environment. Alternatively, just ignore them since we already align CommonChunk to the natural size of the content (up to 32 bytes). That would only trade away the possibility to overalign small symbols, which doesn't sound like something that might not need to be handled? Differential Revision: https://reviews.llvm.org/D36304 llvm-svn: 310871
2017-08-15 03:07:27 +08:00
# REQUIRES: x86
[test] Replace `yaml2obj >` with `yaml2obj -o` and remove unneeded input redirection
2020-08-21 06:00:25 +08:00
# RUN: yaml2obj %s -o %t.obj
[COFF] Add support for aligncomm directives These are emitted for comm symbols in object files, when targeting a GNU environment. Alternatively, just ignore them since we already align CommonChunk to the natural size of the content (up to 32 bytes). That would only trade away the possibility to overalign small symbols, which doesn't sound like something that might not need to be handled? Differential Revision: https://reviews.llvm.org/D36304 llvm-svn: 310871
2017-08-15 03:07:27 +08:00
# RUN: lld-link /out:%t.exe /entry:main %t.obj %t.obj
# RUN: llvm-objdump -d %t.exe | FileCheck %s
# Operands of B8 (MOV EAX) are common symbols
COFF: Layout sections in the same order as link.exe One place where this seems to matter is to make sure the .rsrc section comes after .text. The Win32 UpdateResource() function can change the contents of .rsrc. It will move the sections that come after, but if .text gets moved, the entry point header will not get updated and the executable breaks. This was found by a test in Chromium. Differential Revision: https://reviews.llvm.org/D45260 llvm-svn: 329221
2018-04-05 03:15:55 +08:00
# CHECK: 1000: b8 00 20 00 40
# CHECK: 1005: b8 10 20 00 40
[COFF] Add support for aligncomm directives These are emitted for comm symbols in object files, when targeting a GNU environment. Alternatively, just ignore them since we already align CommonChunk to the natural size of the content (up to 32 bytes). That would only trade away the possibility to overalign small symbols, which doesn't sound like something that might not need to be handled? Differential Revision: https://reviews.llvm.org/D36304 llvm-svn: 310871
2017-08-15 03:07:27 +08:00
--- !COFF
header:
Machine: IMAGE_FILE_MACHINE_AMD64
Characteristics: []
sections:
- Name: .text
Characteristics: [ IMAGE_SCN_CNT_CODE, IMAGE_SCN_MEM_EXECUTE, IMAGE_SCN_MEM_READ ]
Alignment: 4
SectionData: b800000000b800000000
Relocations:
- VirtualAddress: 1
SymbolName: bssdata4
Type: IMAGE_REL_AMD64_ADDR32
- VirtualAddress: 6
SymbolName: bssdata4_align16
Type: IMAGE_REL_AMD64_ADDR32
- Name: .drectve
Characteristics: [ IMAGE_SCN_LNK_INFO, IMAGE_SCN_LNK_REMOVE ]
Alignment: 1
SectionData: 202d616c69676e636f6d6d3a62737364617461345f616c69676e31362c340a # -aligncomm:bssdata4_align16,4
symbols:
- Name: .text
Value: 0
SectionNumber: 1
SimpleType: IMAGE_SYM_TYPE_NULL
ComplexType: IMAGE_SYM_DTYPE_NULL
StorageClass: IMAGE_SYM_CLASS_STATIC
SectionDefinition:
Length: 0
NumberOfRelocations: 5
NumberOfLinenumbers: 0
CheckSum: 0
Number: 0
- Name: main
Value: 0
SectionNumber: 1
SimpleType: IMAGE_SYM_TYPE_NULL
ComplexType: IMAGE_SYM_DTYPE_FUNCTION
StorageClass: IMAGE_SYM_CLASS_EXTERNAL
- Name: bssdata4
Value: 4
SectionNumber: 0
SimpleType: IMAGE_SYM_TYPE_NULL
ComplexType: IMAGE_SYM_DTYPE_NULL
StorageClass: IMAGE_SYM_CLASS_EXTERNAL
- Name: bssdata4_align16
Value: 4
SectionNumber: 0
SimpleType: IMAGE_SYM_TYPE_NULL
ComplexType: IMAGE_SYM_DTYPE_NULL
StorageClass: IMAGE_SYM_CLASS_EXTERNAL
...