From bc971c1575ab0f3f647ee7cc8b803a443a8db8ad Mon Sep 17 00:00:00 2001 From: Dale Johannesen Date: Fri, 15 Jan 2010 01:54:55 +0000 Subject: [PATCH] Lower FrameIndex operand of DEBUG_VALUE (specially) and print it as a comment on X86. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@93499 91177308-0d34-0410-b5e6-96231b3b80d8 --- lib/Target/X86/AsmPrinter/X86MCInstLower.cpp | 20 ++++++++++++++++++++ lib/Target/X86/X86RegisterInfo.cpp | 9 +++++++++ 2 files changed, 29 insertions(+) diff --git a/lib/Target/X86/AsmPrinter/X86MCInstLower.cpp b/lib/Target/X86/AsmPrinter/X86MCInstLower.cpp index a4939af1b8e..9ee118cdfd9 100644 --- a/lib/Target/X86/AsmPrinter/X86MCInstLower.cpp +++ b/lib/Target/X86/AsmPrinter/X86MCInstLower.cpp @@ -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; diff --git a/lib/Target/X86/X86RegisterInfo.cpp b/lib/Target/X86/X86RegisterInfo.cpp index d96aafda603..9bd96af6c75 100644 --- a/lib/Target/X86/X86RegisterInfo.cpp +++ b/lib/Target/X86/X86RegisterInfo.cpp @@ -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 -- 2.34.1