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llvm-mirror/test/MC/COFF/basic-coff.s
Saleem Abdulrasool 542dba4868 MC: prevent early DCE of empty sections
Prevent the early elimination of sections in the object writer.  There may be
references to the section itself by other symbols, which may potentially not be
possible to resolve.  ML (Visual Studio's Macro Assembler) also seems to retain
empty sections.

The elimination of symbols and sections which are unused should really occur at
the link phase.  This will not cause any change in the resulting binary, simply
in the generated object files.

The adjustments to the other unit tests account for the fluctuating section
index caused by the appearance of sections which were previously discarded.

llvm-svn: 210373
2014-06-06 21:40:16 +00:00

138 lines
4.1 KiB
ArmAsm

// This test checks that the COFF object emitter works for the most basic
// programs.
// RUN: llvm-mc -filetype=obj -triple i686-pc-win32 %s | llvm-readobj -h -s -sr -sd -t | FileCheck %s
.def _main;
.scl 2;
.type 32;
.endef
.text
.globl _main
.align 16, 0x90
_main: # @main
# BB#0: # %entry
subl $4, %esp
movl $L_.str, (%esp)
call _printf
xorl %eax, %eax
addl $4, %esp
ret
.data
L_.str: # @.str
.asciz "Hello World"
// CHECK: ImageFileHeader {
// CHECK: Machine: IMAGE_FILE_MACHINE_I386
// CHECK: SectionCount: 3
// CHECK: TimeDateStamp: {{[0-9]+}}
// CHECK: PointerToSymbolTable: 0x{{[0-9A-F]+}}
// CHECK: SymbolCount: 8
// CHECK: OptionalHeaderSize: 0
// CHECK: Characteristics [ (0x0)
// CHECK: ]
// CHECK: }
// CHECK: Sections [
// CHECK: Section {
// CHECK: Number: [[TextNum:[0-9]+]]
// CHECK: Name: .text
// CHECK: VirtualSize: 0
// CHECK: VirtualAddress: 0
// CHECK: RawDataSize: {{[0-9]+}}
// CHECK: PointerToRawData: 0x{{[0-9A-F]+}}
// CHECK: PointerToRelocations: 0x{{[0-9A-F]+}}
// CHECK: PointerToLineNumbers: 0x0
// CHECK: RelocationCount: 2
// CHECK: LineNumberCount: 0
// CHECK: Characteristics [ (0x60500020)
// CHECK: IMAGE_SCN_ALIGN_16BYTES
// CHECK: IMAGE_SCN_CNT_CODE
// CHECK: IMAGE_SCN_MEM_EXECUTE
// CHECK: IMAGE_SCN_MEM_READ
// CHECK: ]
// CHECK: Relocations [
// CHECK: 0x{{[0-9A-F]+}} IMAGE_REL_I386_DIR32 .data
// CHECK: 0x{{[0-9A-F]+}} IMAGE_REL_I386_REL32 _printf
// CHECK: ]
// CHECK: }
// CHECK: Section {
// CHECK: Number: [[DataNum:[0-9]+]]
// CHECK: Name: .data
// CHECK: VirtualSize: 0
// CHECK: VirtualAddress: 0
// CHECK: RawDataSize: {{[0-9]+}}
// CHECK: PointerToRawData: 0x{{[0-9A-F]+}}
// CHECK: PointerToRelocations: 0x0
// CHECK: PointerToLineNumbers: 0x0
// CHECK: RelocationCount: 0
// CHECK: LineNumberCount: 0
// CHECK: Characteristics [ (0xC0300040)
// CHECK: IMAGE_SCN_ALIGN_4BYTES
// CHECK: IMAGE_SCN_CNT_INITIALIZED_DATA
// CHECK: IMAGE_SCN_MEM_READ
// CHECK: IMAGE_SCN_MEM_WRITE
// CHECK: ]
// CHECK: Relocations [
// CHECK: ]
// CHECK: SectionData (
// CHECK: 0000: 48656C6C 6F20576F 726C6400 |Hello World.|
// CHECK: )
// CHECK: }
// CHECK: ]
// CHECK: Symbols [
// CHECK: Symbol {
// CHECK: Name: .text
// CHECK: Value: 0
// CHECK: Section: .text
// CHECK: BaseType: Null
// CHECK: ComplexType: Null
// CHECK: StorageClass: Static
// CHECK: AuxSymbolCount: 1
// CHECK: AuxSectionDef {
// CHECK: Length: 21
// CHECK: RelocationCount: 2
// CHECK: LineNumberCount: 0
// CHECK: Checksum: 0x0
// CHECK: Number: 1
// CHECK: Selection: 0x0
// CHECK: }
// CHECK: }
// CHECK: Symbol {
// CHECK: Name: .data
// CHECK: Value: 0
// CHECK: Section: .data
// CHECK: BaseType: Null
// CHECK: ComplexType: Null
// CHECK: StorageClass: Static
// CHECK: AuxSymbolCount: 1
// CHECK: AuxSectionDef {
// CHECK: Length: 12
// CHECK: RelocationCount: 0
// CHECK: LineNumberCount: 0
// CHECK: Checksum: 0x0
// CHECK: Number: 2
// CHECK: Selection: 0x0
// CHECK: Unused: (00 00 00)
// CHECK: }
// CHECK: }
// CHECK: Symbol {
// CHECK: Name: _main
// CHECK: Value: 0
// CHECK: Section: .text
// CHECK: BaseType: Null
// CHECK: ComplexType: Function
// CHECK: StorageClass: External
// CHECK: AuxSymbolCount: 0
// CHECK: }
// CHECK: Symbol {
// CHECK: Name: _printf
// CHECK: Value: 0
// CHECK: Section: (0)
// CHECK: BaseType: Null
// CHECK: ComplexType: Null
// CHECK: StorageClass: External
// CHECK: AuxSymbolCount: 0
// CHECK: }
// CHECK: ]