diff options
Diffstat (limited to 'lib/CodeGen/AsmPrinter/AsmPrinterDwarf.cpp')
| -rw-r--r-- | lib/CodeGen/AsmPrinter/AsmPrinterDwarf.cpp | 82 |
1 files changed, 81 insertions, 1 deletions
diff --git a/lib/CodeGen/AsmPrinter/AsmPrinterDwarf.cpp b/lib/CodeGen/AsmPrinter/AsmPrinterDwarf.cpp index 9e7f182d82..b310578584 100644 --- a/lib/CodeGen/AsmPrinter/AsmPrinterDwarf.cpp +++ b/lib/CodeGen/AsmPrinter/AsmPrinterDwarf.cpp @@ -13,17 +13,24 @@ #define DEBUG_TYPE "asm-printer" #include "llvm/CodeGen/AsmPrinter.h" +#include "llvm/CodeGen/MachineLocation.h" #include "llvm/MC/MCAsmInfo.h" #include "llvm/MC/MCSection.h" #include "llvm/MC/MCStreamer.h" #include "llvm/MC/MCSymbol.h" #include "llvm/Target/TargetData.h" +#include "llvm/Target/TargetFrameInfo.h" #include "llvm/Target/TargetLoweringObjectFile.h" #include "llvm/Target/TargetMachine.h" +#include "llvm/Target/TargetRegisterInfo.h" #include "llvm/ADT/Twine.h" #include "llvm/Support/Dwarf.h" using namespace llvm; +//===----------------------------------------------------------------------===// +// Dwarf Emission Helper Routines +//===----------------------------------------------------------------------===// + /// EmitSLEB128 - emit the specified signed leb128 value. void AsmPrinter::EmitSLEB128(int Value, const char *Desc) const { if (isVerbose() && Desc) @@ -118,7 +125,7 @@ static const char *DecodeDWARFEncoding(unsigned Encoding) { /// encoding. If verbose assembly output is enabled, we output comments /// describing the encoding. Desc is an optional string saying what the /// encoding is specifying (e.g. "LSDA"). -void AsmPrinter::EmitEncodingByte(unsigned Val, const char *Desc) { +void AsmPrinter::EmitEncodingByte(unsigned Val, const char *Desc) const { if (isVerbose()) { if (Desc != 0) OutStreamer.AddComment(Twine(Desc)+" Encoding = " + @@ -196,4 +203,77 @@ void AsmPrinter::EmitSectionOffset(const MCSymbol *Label, EmitLabelDifference(Label, SectionLabel, 4); } +//===----------------------------------------------------------------------===// +// Dwarf Lowering Routines +//===----------------------------------------------------------------------===// + +/// EmitFrameMoves - Emit frame instructions to describe the layout of the +/// frame. +void AsmPrinter::EmitFrameMoves(const std::vector<MachineMove> &Moves, + MCSymbol *BaseLabel, bool isEH) const { + const TargetRegisterInfo *RI = TM.getRegisterInfo(); + + int stackGrowth = TM.getTargetData()->getPointerSize(); + if (TM.getFrameInfo()->getStackGrowthDirection() != + TargetFrameInfo::StackGrowsUp) + stackGrowth *= -1; + + for (unsigned i = 0, N = Moves.size(); i < N; ++i) { + const MachineMove &Move = Moves[i]; + MCSymbol *Label = Move.getLabel(); + // Throw out move if the label is invalid. + if (Label && !Label->isDefined()) continue; // Not emitted, in dead code. + + const MachineLocation &Dst = Move.getDestination(); + const MachineLocation &Src = Move.getSource(); + + // Advance row if new location. + if (BaseLabel && Label) { + MCSymbol *ThisSym = Label; + if (ThisSym != BaseLabel) { + EmitCFAByte(dwarf::DW_CFA_advance_loc4); + EmitLabelDifference(ThisSym, BaseLabel, 4); + BaseLabel = ThisSym; + } + } + + // If advancing cfa. + if (Dst.isReg() && Dst.getReg() == MachineLocation::VirtualFP) { + assert(!Src.isReg() && "Machine move not supported yet."); + + if (Src.getReg() == MachineLocation::VirtualFP) { + EmitCFAByte(dwarf::DW_CFA_def_cfa_offset); + } else { + EmitCFAByte(dwarf::DW_CFA_def_cfa); + EmitULEB128(RI->getDwarfRegNum(Src.getReg(), isEH), "Register"); + } + + EmitULEB128(-Src.getOffset(), "Offset"); + continue; + } + + if (Src.isReg() && Src.getReg() == MachineLocation::VirtualFP) { + assert(Dst.isReg() && "Machine move not supported yet."); + EmitCFAByte(dwarf::DW_CFA_def_cfa_register); + EmitULEB128(RI->getDwarfRegNum(Dst.getReg(), isEH), "Register"); + continue; + } + + unsigned Reg = RI->getDwarfRegNum(Src.getReg(), isEH); + int Offset = Dst.getOffset() / stackGrowth; + + if (Offset < 0) { + EmitCFAByte(dwarf::DW_CFA_offset_extended_sf); + EmitULEB128(Reg, "Reg"); + EmitSLEB128(Offset, "Offset"); + } else if (Reg < 64) { + EmitCFAByte(dwarf::DW_CFA_offset + Reg); + EmitULEB128(Offset, "Offset"); + } else { + EmitCFAByte(dwarf::DW_CFA_offset_extended); + EmitULEB128(Reg, "Reg"); + EmitULEB128(Offset, "Offset"); + } + } +} |