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Some autoconf tests use module level inline asm to test compiler's handling of

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.cfi_startproc. e.g. libffi:

 $ cat confopt.c 
asm (".cfi_startproc\n\t.cfi_endproc");

int main () { return 0; }

Teach MC / dwarf emission to handle these cfi directives which essentially
create an empty frame.

rdar://10017184

llvm-svn: 138504
This commit is contained in:
Evan Cheng 2011-08-24 22:31:37 +00:00
parent aae1749f65
commit 7bfc442b2d
3 changed files with 15 additions and 6 deletions
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2
lib/MC/MCDwarf.cpp
View File

@ -895,7 +895,7 @@ MCSymbol *FrameEmitterImpl::EmitFDE(MCStreamer &streamer,
const MCObjectFileInfo *MOFI = context.getObjectFileInfo();
bool verboseAsm = streamer.isVerboseAsm();
if (!MOFI->isFunctionEHFrameSymbolPrivate() && IsEH) {
if (IsEH && frame.Function && !MOFI->isFunctionEHFrameSymbolPrivate()) {
MCSymbol *EHSym =
context.GetOrCreateSymbol(frame.Function->getName() + Twine(".eh"));
streamer.EmitEHSymAttributes(frame.Function, EHSym);

4
lib/MC/MCStreamer.cpp
View File

@ -190,14 +190,14 @@ void MCStreamer::EmitCFIStartProc() {
MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
if (CurFrame && !CurFrame->End)
report_fatal_error("Starting a frame before finishing the previous one!");
MCDwarfFrameInfo Frame;
MCDwarfFrameInfo Frame;
Frame.Function = LastSymbol;
// If the function is externally visible, we need to create a local
// symbol to avoid relocations.
StringRef Prefix = getContext().getAsmInfo().getPrivateGlobalPrefix();
if (LastSymbol->getName().startswith(Prefix)) {
if (LastSymbol && LastSymbol->getName().startswith(Prefix)) {
Frame.Begin = LastSymbol;
} else {
Frame.Begin = getContext().CreateTempSymbol();

15
test/MC/MachO/debug_frame.s
View File

@ -1,5 +1,11 @@
// RUN: llvm-mc -triple i386-apple-darwin %s -filetype=obj -o - | macho-dump | FileCheck %s
// Make sure MC can handle file level .cfi_startproc and .cfi_endproc that creates
// an empty frame.
// rdar://10017184
.cfi_startproc
.cfi_endproc
// Check that we don't produce a relocation for the CIE pointer and therefore
// we have only one relocation in __debug_frame.
@ -22,17 +28,20 @@ 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: ('size', 52)
// CHECK-NEXT: ('offset', 332)
// CHECK-NEXT: ('alignment', 2)
// CHECK-NEXT: ('reloc_offset', 368)
// CHECK-NEXT: ('num_reloc', 1)
// CHECK-NEXT: ('reloc_offset', 384)
// CHECK-NEXT: ('num_reloc', 2)
// 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', 0x2c),
// CHECK-NEXT: ('word-1', 0x4000001)),
// CHECK-NEXT: # Relocation 1
// CHECK-NEXT: (('word-0', 0x1c),
// CHECK-NEXT: ('word-1', 0x4000001)),
// CHECK-NEXT: ])