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Lower FrameIndex operand of DEBUG_VALUE (specially) and

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print it as a comment on X86.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@93499 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dale Johannesen 2010-01-15 01:54:55 +00:00
parent 243a32f96b
commit bc971c1575
2 changed files with 29 additions and 0 deletions
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20
lib/Target/X86/AsmPrinter/X86MCInstLower.cpp
View File

@ -25,6 +25,7 @@
#include "llvm/Support/FormattedStream.h"
#include "llvm/Support/Mangler.h"
#include "llvm/ADT/SmallString.h"
#include "llvm/Analysis/DebugInfo.h"
using namespace llvm;
@ -420,6 +421,25 @@ void X86AsmPrinter::printInstructionThroughMCStreamer(const MachineInstr *MI) {
case TargetInstrInfo::GC_LABEL:
printLabel(MI);
return;
case TargetInstrInfo::DEBUG_VALUE: {
if (!VerboseAsm)
return;
O << '\t' << MAI->getCommentString() << "DEBUG_VALUE: ";
// cast away const; DIetc do not take const operands for some reason
DIVariable V((MDNode*)(MI->getOperand(2).getMetadata()));
O << V.getName();
O << " <- ";
if (MI->getOperand(0).getType()==MachineOperand::MO_Register)
printOperand(MI, 0);
else {
assert(MI->getOperand(0).getType()==MachineOperand::MO_Immediate);
int64_t imm = MI->getOperand(0).getImm();
O << '[' << ((imm<0) ? "EBP" : "ESP+") << imm << ']';
}
O << "+";
printOperand(MI, 1);
return;
}
case TargetInstrInfo::INLINEASM:
printInlineAsm(MI);
return;

9
lib/Target/X86/X86RegisterInfo.cpp
View File

@ -591,6 +591,15 @@ X86RegisterInfo::eliminateFrameIndex(MachineBasicBlock::iterator II,
int FrameIndex = MI.getOperand(i).getIndex();
unsigned BasePtr;
// DEBUG_VALUE has a special representation, and is only robust enough to
// represent SP(or BP) +- offset addressing modes. We rewrite the
// FrameIndex to be a constant; implicitly positive constants are relative
// to ESP and negative ones to EBP.
if (MI.getOpcode()==TargetInstrInfo::DEBUG_VALUE) {
MI.getOperand(i).ChangeToImmediate(getFrameIndexOffset(MF, FrameIndex));
return 0;
}
if (needsStackRealignment(MF))
BasePtr = (FrameIndex < 0 ? FramePtr : StackPtr);
else