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Remove the nasty LABEL hack with a much less evil one. Now llvm.dbg.func.start implies a stoppoint is set. SelectionDAGISel records a new source line but does not create a ISD::LABEL node for this special stoppoint. Asm printer will magically print this label. This ensures nothing is emitted before.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@46635 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng
2008-02-01 09:10:45 +00:00
parent a647c92ec2
commit 1b08bbca55
8 changed files with 29 additions and 59 deletions
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20
lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
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@@ -2641,13 +2641,21 @@ SelectionDAGLowering::visitIntrinsicCall(CallInst &I, unsigned Intrinsic) {
}
case Intrinsic::dbg_func_start: {
MachineModuleInfo *MMI = DAG.getMachineModuleInfo();
if (!MMI) return 0;
DbgFuncStartInst &FSI = cast<DbgFuncStartInst>(I);
if (MMI && FSI.getSubprogram() &&
MMI->Verify(FSI.getSubprogram())) {
unsigned LabelID = MMI->RecordRegionStart(FSI.getSubprogram());
DAG.setRoot(DAG.getNode(ISD::LABEL, MVT::Other, getRoot(),
DAG.getConstant(LabelID, MVT::i32),
DAG.getConstant(0, MVT::i32)));
Value *SP = FSI.getSubprogram();
if (SP && MMI->Verify(SP)) {
// llvm.dbg.func.start implicitly defines a dbg_stoppoint which is
// what (most?) gdb expects.
DebugInfoDesc *DD = MMI->getDescFor(SP);
assert(DD && "Not a debug information descriptor");
SubprogramDesc *Subprogram = cast<SubprogramDesc>(DD);
const CompileUnitDesc *CompileUnit = Subprogram->getFile();
unsigned SrcFile = MMI->RecordSource(CompileUnit->getDirectory(),
CompileUnit->getFileName());
// Record the source line but does create a label. It will be emitted
// at asm emission time.
MMI->RecordSourceLine(Subprogram->getLine(), 0, SrcFile);
}
return 0;