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Some autoconf tests use module level inline asm to test compiler's handling of
.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 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@138504 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -895,7 +895,7 @@ MCSymbol *FrameEmitterImpl::EmitFDE(MCStreamer &streamer,
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const MCObjectFileInfo *MOFI = context.getObjectFileInfo();
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bool verboseAsm = streamer.isVerboseAsm();
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if (!MOFI->isFunctionEHFrameSymbolPrivate() && IsEH) {
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if (IsEH && frame.Function && !MOFI->isFunctionEHFrameSymbolPrivate()) {
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MCSymbol *EHSym =
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context.GetOrCreateSymbol(frame.Function->getName() + Twine(".eh"));
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streamer.EmitEHSymAttributes(frame.Function, EHSym);
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@ -190,14 +190,14 @@ void MCStreamer::EmitCFIStartProc() {
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MCDwarfFrameInfo *CurFrame = getCurrentFrameInfo();
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if (CurFrame && !CurFrame->End)
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report_fatal_error("Starting a frame before finishing the previous one!");
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MCDwarfFrameInfo Frame;
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MCDwarfFrameInfo Frame;
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Frame.Function = LastSymbol;
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// If the function is externally visible, we need to create a local
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// symbol to avoid relocations.
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StringRef Prefix = getContext().getAsmInfo().getPrivateGlobalPrefix();
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if (LastSymbol->getName().startswith(Prefix)) {
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if (LastSymbol && LastSymbol->getName().startswith(Prefix)) {
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Frame.Begin = LastSymbol;
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} else {
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Frame.Begin = getContext().CreateTempSymbol();
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@ -1,5 +1,11 @@
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// RUN: llvm-mc -triple i386-apple-darwin %s -filetype=obj -o - | macho-dump | FileCheck %s
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// Make sure MC can handle file level .cfi_startproc and .cfi_endproc that creates
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// an empty frame.
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// rdar://10017184
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.cfi_startproc
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.cfi_endproc
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// Check that we don't produce a relocation for the CIE pointer and therefore
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// we have only one relocation in __debug_frame.
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@ -22,17 +28,20 @@ Ltext_end:
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// CHECK: (('section_name', '__debug_frame\x00\x00\x00')
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// CHECK-NEXT: ('segment_name', '__DWARF\x00\x00\x00\x00\x00\x00\x00\x00\x00')
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// CHECK-NEXT: ('address', 8)
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// CHECK-NEXT: ('size', 36)
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// CHECK-NEXT: ('size', 52)
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// CHECK-NEXT: ('offset', 332)
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// CHECK-NEXT: ('alignment', 2)
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// CHECK-NEXT: ('reloc_offset', 368)
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// CHECK-NEXT: ('num_reloc', 1)
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// CHECK-NEXT: ('reloc_offset', 384)
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// CHECK-NEXT: ('num_reloc', 2)
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// CHECK-NEXT: ('flags', 0x2000000)
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// CHECK-NEXT: ('reserved1', 0)
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// CHECK-NEXT: ('reserved2', 0)
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// CHECK-NEXT: ),
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// CHECK-NEXT: ('_relocations', [
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// CHECK-NEXT: # Relocation 0
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// CHECK-NEXT: (('word-0', 0x2c),
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// CHECK-NEXT: ('word-1', 0x4000001)),
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// CHECK-NEXT: # Relocation 1
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// CHECK-NEXT: (('word-0', 0x1c),
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// CHECK-NEXT: ('word-1', 0x4000001)),
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// CHECK-NEXT: ])
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