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On MachO, unlike ELF, there should be no relocation to produce the CIE pointer.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@131149 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Rafael Espindola 2011-05-10 20:59:42 +00:00
parent dc52ecf6fd
commit e3a0e987f3
2 changed files with 55 additions and 8 deletions
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25
lib/MC/MCDwarf.cpp
View File

@ -502,11 +502,12 @@ namespace {
int CIENum;
bool UsingCFI;
bool IsEH;
const MCSymbol *SectionStart;
public:
FrameEmitterImpl(bool usingCFI, bool isEH) : CFAOffset(0), CIENum(0),
UsingCFI(usingCFI),
IsEH(isEH) {
FrameEmitterImpl(bool usingCFI, bool isEH, const MCSymbol *sectionStart) :
CFAOffset(0), CIENum(0), UsingCFI(usingCFI), IsEH(isEH),
SectionStart(sectionStart) {
}
const MCSymbol &EmitCIE(MCStreamer &streamer,
@ -737,9 +738,9 @@ MCSymbol *FrameEmitterImpl::EmitFDE(MCStreamer &streamer,
MCContext &context = streamer.getContext();
MCSymbol *fdeStart = context.CreateTempSymbol();
MCSymbol *fdeEnd = context.CreateTempSymbol();
const TargetAsmInfo &asmInfo = context.getTargetAsmInfo();
const TargetAsmInfo &TAsmInfo = context.getTargetAsmInfo();
if (!asmInfo.isFunctionEHFrameSymbolPrivate() && IsEH) {
if (!TAsmInfo.isFunctionEHFrameSymbolPrivate() && IsEH) {
MCSymbol *EHSym = context.GetOrCreateSymbol(
frame.Function->getName() + Twine(".eh"));
streamer.EmitEHSymAttributes(frame.Function, EHSym);
@ -751,15 +752,21 @@ MCSymbol *FrameEmitterImpl::EmitFDE(MCStreamer &streamer,
streamer.EmitAbsValue(Length, 4);
streamer.EmitLabel(fdeStart);
// CIE Pointer
const MCAsmInfo &asmInfo = context.getAsmInfo();
if (IsEH) {
const MCExpr *offset = MakeStartMinusEndExpr(streamer, cieStart, *fdeStart,
0);
streamer.EmitAbsValue(offset, 4);
} else if (!asmInfo.doesDwarfRequireRelocationForSectionOffset()) {
const MCExpr *offset = MakeStartMinusEndExpr(streamer, *SectionStart,
cieStart, 0);
streamer.EmitAbsValue(offset, 4);
} else {
streamer.EmitSymbolValue(&cieStart, 4);
}
unsigned fdeEncoding = asmInfo.getFDEEncoding(UsingCFI);
unsigned fdeEncoding = TAsmInfo.getFDEEncoding(UsingCFI);
unsigned size = getSizeForEncoding(streamer, fdeEncoding);
// PC Begin
@ -840,15 +847,17 @@ namespace llvm {
void MCDwarfFrameEmitter::Emit(MCStreamer &streamer,
bool usingCFI,
bool isEH) {
const MCContext &context = streamer.getContext();
MCContext &context = streamer.getContext();
const TargetAsmInfo &asmInfo = context.getTargetAsmInfo();
const MCSection &section = isEH ?
*asmInfo.getEHFrameSection() : *asmInfo.getDwarfFrameSection();
streamer.SwitchSection(&section);
MCSymbol *SectionStart = context.CreateTempSymbol();
streamer.EmitLabel(SectionStart);
MCSymbol *fdeEnd = NULL;
DenseMap<CIEKey, const MCSymbol*> CIEStarts;
FrameEmitterImpl Emitter(usingCFI, isEH);
FrameEmitterImpl Emitter(usingCFI, isEH, SectionStart);
const MCSymbol *DummyDebugKey = NULL;
for (unsigned i = 0, n = streamer.getNumFrameInfos(); i < n; ++i) {

38
test/MC/MachO/debug_frame.s Normal file
View File

@ -0,0 +1,38 @@
// RUN: llvm-mc -triple i386-apple-darwin %s -filetype=obj -o - | macho-dump | FileCheck %s
// Check that we don't produce a relocation for the CIE pointer and therefore
// we have only one relocation in __debug_frame.
.section __TEXT,__text,regular,pure_instructions
.globl _f
.align 4, 0x90
_f: ## @f
Ltmp0:
.cfi_startproc
## BB#0: ## %entry
movl $42, %eax
ret
Ltmp1:
.cfi_endproc
Leh_func_end0:
.cfi_sections .debug_frame
Ltext_end:
// CHECK: (('section_name', '__debug_frame\x00\x00\x00')
// CHECK-NEXT: ('segment_name', '__DWARF\x00\x00\x00\x00\x00\x00\x00\x00\x00')
// CHECK-NEXT: ('address', 8)
// CHECK-NEXT: ('size', 36)
// CHECK-NEXT: ('offset', 332)
// CHECK-NEXT: ('alignment', 2)
// CHECK-NEXT: ('reloc_offset', 368)
// CHECK-NEXT: ('num_reloc', 1)
// CHECK-NEXT: ('flags', 0x2000000)
// CHECK-NEXT: ('reserved1', 0)
// CHECK-NEXT: ('reserved2', 0)
// CHECK-NEXT: ),
// CHECK-NEXT: ('_relocations', [
// CHECK-NEXT: # Relocation 0
// CHECK-NEXT: (('word-0', 0x1c),
// CHECK-NEXT: ('word-1', 0x4000001)),
// CHECK-NEXT: ])