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Assume .cfi_startproc is the first thing in a function. If the function is

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externally visable, create a local symbol to use in the CFE. If not, use the
function label itself.

Fixes PR10420.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@136716 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Rafael Espindola 2011-08-02 20:24:22 +00:00
parent 6cdc1f43e6
commit 49cb9b8886
3 changed files with 36 additions and 8 deletions
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2
include/llvm/MC/MCStreamer.h
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@ -64,7 +64,7 @@ namespace llvm {
void setCurrentW64UnwindInfo(MCWin64EHUnwindInfo *Frame);
void EnsureValidW64UnwindInfo();
const MCSymbol* LastNonPrivate;
MCSymbol* LastSymbol;
/// SectionStack - This is stack of current and previous section
/// values saved by PushSection.

21
lib/MC/MCStreamer.cpp
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@ -171,10 +171,7 @@ void MCStreamer::EmitLabel(MCSymbol *Symbol) {
assert(!Symbol->isVariable() && "Cannot emit a variable symbol!");
assert(getCurrentSection() && "Cannot emit before setting section!");
Symbol->setSection(*getCurrentSection());
StringRef Prefix = getContext().getAsmInfo().getPrivateGlobalPrefix();
if (!Symbol->getName().startswith(Prefix))
LastNonPrivate = Symbol;
LastSymbol = Symbol;
}
void MCStreamer::EmitCompactUnwindEncoding(uint32_t CompactUnwindEncoding) {
@ -194,9 +191,19 @@ void MCStreamer::EmitCFIStartProc() {
if (CurFrame && !CurFrame->End)
report_fatal_error("Starting a frame before finishing the previous one!");
MCDwarfFrameInfo Frame;
Frame.Begin = getContext().CreateTempSymbol();
Frame.Function = LastNonPrivate;
EmitLabel(Frame.Begin);
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)) {
Frame.Begin = LastSymbol;
} else {
Frame.Begin = getContext().CreateTempSymbol();
EmitLabel(Frame.Begin);
}
FrameInfos.push_back(Frame);
}

21
test/CodeGen/X86/pr10420.ll Normal file
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@ -0,0 +1,21 @@
; RUN: llc < %s -mtriple=x86_64-apple-macosx -disable-cfi | FileCheck %s
define private void @foo() {
ret void
}
define void @bar() {
call void @foo()
ret void;
}
; CHECK: _bar: ## @bar
; CHECK-NEXT: Ltmp2:
; CHECK: Ltmp12:
; CHECK-NEXT: Ltmp13 = L_foo-Ltmp12 ## FDE initial location
; CHECK-NEXT: .quad Ltmp13
; CHECK: Ltmp19:
; CHECK-NEXT: Ltmp20 = Ltmp2-Ltmp19 ## FDE initial location
; CHECK-NEXT: .quad Ltmp20