AsmPrinterDwarf.cpp [plain text]
#include "ByteStreamer.h"
#include "DwarfDebug.h"
#include "DwarfExpression.h"
#include "llvm/ADT/Twine.h"
#include "llvm/CodeGen/AsmPrinter.h"
#include "llvm/CodeGen/DIE.h"
#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/CodeGen/MachineModuleInfo.h"
#include "llvm/IR/DataLayout.h"
#include "llvm/MC/MCAsmInfo.h"
#include "llvm/MC/MCRegisterInfo.h"
#include "llvm/MC/MCSection.h"
#include "llvm/MC/MCStreamer.h"
#include "llvm/MC/MCSymbol.h"
#include "llvm/MC/MachineLocation.h"
#include "llvm/Support/Dwarf.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Target/TargetLoweringObjectFile.h"
#include "llvm/Target/TargetMachine.h"
#include "llvm/Target/TargetSubtargetInfo.h"
using namespace llvm;
#define DEBUG_TYPE "asm-printer"
void AsmPrinter::EmitSLEB128(int64_t Value, const char *Desc) const {
if (isVerbose() && Desc)
OutStreamer.AddComment(Desc);
OutStreamer.EmitSLEB128IntValue(Value);
}
void AsmPrinter::EmitULEB128(uint64_t Value, const char *Desc,
unsigned PadTo) const {
if (isVerbose() && Desc)
OutStreamer.AddComment(Desc);
OutStreamer.EmitULEB128IntValue(Value, PadTo);
}
void AsmPrinter::EmitCFAByte(unsigned Val) const {
if (isVerbose()) {
if (Val >= dwarf::DW_CFA_offset && Val < dwarf::DW_CFA_offset + 64)
OutStreamer.AddComment("DW_CFA_offset + Reg (" +
Twine(Val - dwarf::DW_CFA_offset) + ")");
else
OutStreamer.AddComment(dwarf::CallFrameString(Val));
}
OutStreamer.EmitIntValue(Val, 1);
}
static const char *DecodeDWARFEncoding(unsigned Encoding) {
switch (Encoding) {
case dwarf::DW_EH_PE_absptr:
return "absptr";
case dwarf::DW_EH_PE_omit:
return "omit";
case dwarf::DW_EH_PE_pcrel:
return "pcrel";
case dwarf::DW_EH_PE_udata4:
return "udata4";
case dwarf::DW_EH_PE_udata8:
return "udata8";
case dwarf::DW_EH_PE_sdata4:
return "sdata4";
case dwarf::DW_EH_PE_sdata8:
return "sdata8";
case dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_udata4:
return "pcrel udata4";
case dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4:
return "pcrel sdata4";
case dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_udata8:
return "pcrel udata8";
case dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata8:
return "pcrel sdata8";
case dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_udata4
:
return "indirect pcrel udata4";
case dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4
:
return "indirect pcrel sdata4";
case dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_udata8
:
return "indirect pcrel udata8";
case dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata8
:
return "indirect pcrel sdata8";
}
return "<unknown encoding>";
}
void AsmPrinter::EmitEncodingByte(unsigned Val, const char *Desc) const {
if (isVerbose()) {
if (Desc)
OutStreamer.AddComment(Twine(Desc) + " Encoding = " +
Twine(DecodeDWARFEncoding(Val)));
else
OutStreamer.AddComment(Twine("Encoding = ") + DecodeDWARFEncoding(Val));
}
OutStreamer.EmitIntValue(Val, 1);
}
unsigned AsmPrinter::GetSizeOfEncodedValue(unsigned Encoding) const {
if (Encoding == dwarf::DW_EH_PE_omit)
return 0;
switch (Encoding & 0x07) {
default:
llvm_unreachable("Invalid encoded value.");
case dwarf::DW_EH_PE_absptr:
return TM.getDataLayout()->getPointerSize();
case dwarf::DW_EH_PE_udata2:
return 2;
case dwarf::DW_EH_PE_udata4:
return 4;
case dwarf::DW_EH_PE_udata8:
return 8;
}
}
void AsmPrinter::EmitTTypeReference(const GlobalValue *GV,
unsigned Encoding) const {
if (GV) {
const TargetLoweringObjectFile &TLOF = getObjFileLowering();
const MCExpr *Exp =
TLOF.getTTypeGlobalReference(GV, Encoding, *Mang, TM, MMI, OutStreamer);
OutStreamer.EmitValue(Exp, GetSizeOfEncodedValue(Encoding));
} else
OutStreamer.EmitIntValue(0, GetSizeOfEncodedValue(Encoding));
}
void AsmPrinter::emitSectionOffset(const MCSymbol *Label) const {
if (MAI->needsDwarfSectionOffsetDirective()) {
OutStreamer.EmitCOFFSecRel32(Label);
return;
}
if (MAI->doesDwarfUseRelocationsAcrossSections()) {
OutStreamer.EmitSymbolValue(Label, 4);
return;
}
EmitLabelDifference(Label, Label->getSection().getBeginSymbol(), 4);
}
void AsmPrinter::EmitDwarfRegOp(ByteStreamer &Streamer,
const MachineLocation &MLoc) const {
DebugLocDwarfExpression Expr(*MF->getSubtarget().getRegisterInfo(),
getDwarfDebug()->getDwarfVersion(), Streamer);
const MCRegisterInfo *MRI = MMI->getContext().getRegisterInfo();
int Reg = MRI->getDwarfRegNum(MLoc.getReg(), false);
if (Reg < 0) {
if (MLoc.isIndirect())
return Expr.EmitOp(dwarf::DW_OP_nop,
"nop (could not find a dwarf register number)");
if (!Expr.AddMachineRegPiece(MLoc.getReg()))
Expr.EmitOp(dwarf::DW_OP_nop,
"nop (could not find a dwarf register number)");
return;
}
if (MLoc.isIndirect())
Expr.AddRegIndirect(Reg, MLoc.getOffset());
else
Expr.AddReg(Reg);
}
void AsmPrinter::emitCFIInstruction(const MCCFIInstruction &Inst) const {
switch (Inst.getOperation()) {
default:
llvm_unreachable("Unexpected instruction");
case MCCFIInstruction::OpDefCfaOffset:
OutStreamer.EmitCFIDefCfaOffset(Inst.getOffset());
break;
case MCCFIInstruction::OpDefCfa:
OutStreamer.EmitCFIDefCfa(Inst.getRegister(), Inst.getOffset());
break;
case MCCFIInstruction::OpDefCfaRegister:
OutStreamer.EmitCFIDefCfaRegister(Inst.getRegister());
break;
case MCCFIInstruction::OpOffset:
OutStreamer.EmitCFIOffset(Inst.getRegister(), Inst.getOffset());
break;
case MCCFIInstruction::OpRealignedOffset:
OutStreamer.EmitCFIRealignedOffset(Inst.getRegister(), Inst.getOffset(),
Inst.getAlign(), Inst.getOffset2());
break;
case MCCFIInstruction::OpRegister:
OutStreamer.EmitCFIRegister(Inst.getRegister(), Inst.getRegister2());
break;
case MCCFIInstruction::OpWindowSave:
OutStreamer.EmitCFIWindowSave();
break;
case MCCFIInstruction::OpSameValue:
OutStreamer.EmitCFISameValue(Inst.getRegister());
break;
}
}
void AsmPrinter::emitDwarfDIE(const DIE &Die) const {
const DIEAbbrev &Abbrev = Die.getAbbrev();
if (isVerbose())
OutStreamer.AddComment("Abbrev [" + Twine(Abbrev.getNumber()) +
"] 0x" + Twine::utohexstr(Die.getOffset()) +
":0x" + Twine::utohexstr(Die.getSize()) + " " +
dwarf::TagString(Abbrev.getTag()));
EmitULEB128(Abbrev.getNumber());
const SmallVectorImpl<DIEValue *> &Values = Die.getValues();
const SmallVectorImpl<DIEAbbrevData> &AbbrevData = Abbrev.getData();
for (unsigned i = 0, N = Values.size(); i < N; ++i) {
dwarf::Attribute Attr = AbbrevData[i].getAttribute();
dwarf::Form Form = AbbrevData[i].getForm();
assert(Form && "Too many attributes for DIE (check abbreviation)");
if (isVerbose()) {
OutStreamer.AddComment(dwarf::AttributeString(Attr));
if (Attr == dwarf::DW_AT_accessibility)
OutStreamer.AddComment(dwarf::AccessibilityString(
cast<DIEInteger>(Values[i])->getValue()));
}
Values[i]->EmitValue(this, Form);
}
if (Abbrev.hasChildren()) {
for (auto &Child : Die.getChildren())
emitDwarfDIE(Child);
OutStreamer.AddComment("End Of Children Mark");
EmitInt8(0);
}
}
void
AsmPrinter::emitDwarfAbbrevs(const std::vector<DIEAbbrev *>& Abbrevs) const {
for (const DIEAbbrev *Abbrev : Abbrevs) {
EmitULEB128(Abbrev->getNumber(), "Abbreviation Code");
Abbrev->Emit(this);
}
EmitULEB128(0, "EOM(3)");
}