//===----------------------------------------------------------------------===//
#include "ByteStreamer.h"
+#include "DwarfDebug.h"
#include "DwarfExpression.h"
-#include "llvm/CodeGen/AsmPrinter.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/TargetFrameLowering.h"
#include "llvm/Target/TargetLoweringObjectFile.h"
#include "llvm/Target/TargetMachine.h"
-#include "llvm/Target/TargetRegisterInfo.h"
#include "llvm/Target/TargetSubtargetInfo.h"
using namespace llvm;
#define DEBUG_TYPE "asm-printer"
-/// DwarfExpression implementation for .debug_loc entries.
-class DebugLocDwarfExpression : public DwarfExpression {
- ByteStreamer &BS;
-
-public:
- DebugLocDwarfExpression(const AsmPrinter &AP, ByteStreamer &BS)
- : DwarfExpression(AP), BS(BS) {}
-
- void EmitOp(uint8_t Op, const char *Comment) override;
- void EmitSigned(int Value) override;
- void EmitUnsigned(unsigned Value) override;
- unsigned getFrameRegister() override { llvm_unreachable("not available"); };
-};
-
-void DebugLocDwarfExpression::EmitOp(uint8_t Op, const char *Comment) {
- BS.EmitInt8(
- Op, Comment ? Twine(Comment) + " " + dwarf::OperationEncodingString(Op)
- : dwarf::OperationEncodingString(Op));
-}
-void DebugLocDwarfExpression::EmitSigned(int Value) {
- BS.EmitSLEB128(Value, Twine(Value));
-}
-void DebugLocDwarfExpression::EmitUnsigned(unsigned Value) {
- BS.EmitULEB128(Value, Twine(Value));
-}
-
//===----------------------------------------------------------------------===//
// Dwarf Emission Helper Routines
//===----------------------------------------------------------------------===//
/// EmitSLEB128 - emit the specified signed leb128 value.
void AsmPrinter::EmitSLEB128(int64_t Value, const char *Desc) const {
if (isVerbose() && Desc)
- OutStreamer.AddComment(Desc);
+ OutStreamer->AddComment(Desc);
- OutStreamer.EmitSLEB128IntValue(Value);
+ OutStreamer->EmitSLEB128IntValue(Value);
}
-/// EmitULEB128 - emit the specified signed leb128 value.
+/// EmitULEB128 - emit the specified unsigned leb128 value.
void AsmPrinter::EmitULEB128(uint64_t Value, const char *Desc,
unsigned PadTo) const {
if (isVerbose() && Desc)
- OutStreamer.AddComment(Desc);
+ OutStreamer->AddComment(Desc);
- OutStreamer.EmitULEB128IntValue(Value, PadTo);
-}
-
-/// EmitCFAByte - Emit a .byte 42 directive for a DW_CFA_xxx value.
-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);
+ OutStreamer->EmitULEB128IntValue(Value, PadTo);
}
static const char *DecodeDWARFEncoding(unsigned Encoding) {
void AsmPrinter::EmitEncodingByte(unsigned Val, const char *Desc) const {
if (isVerbose()) {
if (Desc)
- OutStreamer.AddComment(Twine(Desc) + " Encoding = " +
- Twine(DecodeDWARFEncoding(Val)));
+ OutStreamer->AddComment(Twine(Desc) + " Encoding = " +
+ Twine(DecodeDWARFEncoding(Val)));
else
- OutStreamer.AddComment(Twine("Encoding = ") + DecodeDWARFEncoding(Val));
+ OutStreamer->AddComment(Twine("Encoding = ") + DecodeDWARFEncoding(Val));
}
- OutStreamer.EmitIntValue(Val, 1);
+ OutStreamer->EmitIntValue(Val, 1);
}
/// GetSizeOfEncodedValue - Return the size of the encoding in bytes.
default:
llvm_unreachable("Invalid encoded value.");
case dwarf::DW_EH_PE_absptr:
- return TM.getSubtargetImpl()->getDataLayout()->getPointerSize();
+ return MF->getDataLayout().getPointerSize();
case dwarf::DW_EH_PE_udata2:
return 2;
case dwarf::DW_EH_PE_udata4:
const TargetLoweringObjectFile &TLOF = getObjFileLowering();
const MCExpr *Exp =
- TLOF.getTTypeGlobalReference(GV, Encoding, *Mang, TM, MMI, OutStreamer);
- OutStreamer.EmitValue(Exp, GetSizeOfEncodedValue(Encoding));
+ TLOF.getTTypeGlobalReference(GV, Encoding, *Mang, TM, MMI,
+ *OutStreamer);
+ OutStreamer->EmitValue(Exp, GetSizeOfEncodedValue(Encoding));
} else
- OutStreamer.EmitIntValue(0, GetSizeOfEncodedValue(Encoding));
+ OutStreamer->EmitIntValue(0, GetSizeOfEncodedValue(Encoding));
}
-/// EmitSectionOffset - Emit the 4-byte offset of Label from the start of its
-/// section. This can be done with a special directive if the target supports
-/// it (e.g. cygwin) or by emitting it as an offset from a label at the start
-/// of the section.
-///
-/// SectionLabel is a temporary label emitted at the start of the section that
-/// Label lives in.
-void AsmPrinter::EmitSectionOffset(const MCSymbol *Label,
- const MCSymbol *SectionLabel) const {
- // On COFF targets, we have to emit the special .secrel32 directive.
- if (MAI->needsDwarfSectionOffsetDirective()) {
- OutStreamer.EmitCOFFSecRel32(Label);
- return;
- }
-
- // Get the section that we're referring to, based on SectionLabel.
- const MCSection &Section = SectionLabel->getSection();
-
- // If Label has already been emitted, verify that it is in the same section as
- // section label for sanity.
- assert((!Label->isInSection() || &Label->getSection() == &Section) &&
- "Section offset using wrong section base for label");
-
- // If the section in question will end up with an address of 0 anyway, we can
- // just emit an absolute reference to save a relocation.
- if (Section.isBaseAddressKnownZero()) {
- OutStreamer.EmitSymbolValue(Label, 4);
- return;
+void AsmPrinter::emitDwarfSymbolReference(const MCSymbol *Label,
+ bool ForceOffset) const {
+ if (!ForceOffset) {
+ // On COFF targets, we have to emit the special .secrel32 directive.
+ if (MAI->needsDwarfSectionOffsetDirective()) {
+ OutStreamer->EmitCOFFSecRel32(Label);
+ return;
+ }
+
+ // If the format uses relocations with dwarf, refer to the symbol directly.
+ if (MAI->doesDwarfUseRelocationsAcrossSections()) {
+ OutStreamer->EmitSymbolValue(Label, 4);
+ return;
+ }
}
// Otherwise, emit it as a label difference from the start of the section.
- EmitLabelDifference(Label, SectionLabel, 4);
+ EmitLabelDifference(Label, Label->getSection().getBeginSymbol(), 4);
}
-// Some targets do not provide a DWARF register number for every
-// register. This function attempts to emit a DWARF register by
-// emitting a piece of a super-register or by piecing together
-// multiple subregisters that alias the register.
-void AsmPrinter::EmitDwarfRegOpPiece(ByteStreamer &Streamer,
- const MachineLocation &MLoc,
- unsigned PieceSizeInBits,
- unsigned PieceOffsetInBits) const {
- assert(MLoc.isReg() && "MLoc must be a register");
- DebugLocDwarfExpression Expr(*this, Streamer);
- Expr.AddMachineRegPiece(MLoc.getReg(), PieceSizeInBits, PieceOffsetInBits);
-}
+void AsmPrinter::emitDwarfStringOffset(DwarfStringPoolEntryRef S) const {
+ if (MAI->doesDwarfUseRelocationsAcrossSections()) {
+ emitDwarfSymbolReference(S.getSymbol());
+ return;
+ }
-void AsmPrinter::EmitDwarfOpPiece(ByteStreamer &Streamer,
- unsigned PieceSizeInBits,
- unsigned PieceOffsetInBits) const {
- DebugLocDwarfExpression Expr(*this, Streamer);
- Expr.AddOpPiece(PieceSizeInBits, PieceOffsetInBits);
+ // Just emit the offset directly; no need for symbol math.
+ EmitInt32(S.getOffset());
}
/// EmitDwarfRegOp - Emit dwarf register operation.
void AsmPrinter::EmitDwarfRegOp(ByteStreamer &Streamer,
- const MachineLocation &MLoc,
- bool Indirect) const {
- DebugLocDwarfExpression Expr(*this, Streamer);
- const TargetRegisterInfo *TRI = TM.getSubtargetImpl()->getRegisterInfo();
- int Reg = TRI->getDwarfRegNum(MLoc.getReg(), false);
+ 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) {
// We assume that pointers are always in an addressable register.
- if (Indirect || MLoc.isIndirect())
+ if (MLoc.isIndirect())
// FIXME: We have no reasonable way of handling errors in here. The
// caller might be in the middle of a dwarf expression. We should
// probably assert that Reg >= 0 once debug info generation is more
"nop (could not find a dwarf register number)");
// Attempt to find a valid super- or sub-register.
- return Expr.AddMachineRegPiece(MLoc.getReg());
+ 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(), Indirect);
- else if (Indirect)
- Expr.AddRegIndirect(Reg, 0, false);
+ Expr.AddRegIndirect(Reg, MLoc.getOffset());
else
Expr.AddReg(Reg);
}
default:
llvm_unreachable("Unexpected instruction");
case MCCFIInstruction::OpDefCfaOffset:
- OutStreamer.EmitCFIDefCfaOffset(Inst.getOffset());
+ OutStreamer->EmitCFIDefCfaOffset(Inst.getOffset());
break;
case MCCFIInstruction::OpDefCfa:
- OutStreamer.EmitCFIDefCfa(Inst.getRegister(), Inst.getOffset());
+ OutStreamer->EmitCFIDefCfa(Inst.getRegister(), Inst.getOffset());
break;
case MCCFIInstruction::OpDefCfaRegister:
- OutStreamer.EmitCFIDefCfaRegister(Inst.getRegister());
+ OutStreamer->EmitCFIDefCfaRegister(Inst.getRegister());
break;
case MCCFIInstruction::OpOffset:
- OutStreamer.EmitCFIOffset(Inst.getRegister(), Inst.getOffset());
+ OutStreamer->EmitCFIOffset(Inst.getRegister(), Inst.getOffset());
break;
case MCCFIInstruction::OpRegister:
- OutStreamer.EmitCFIRegister(Inst.getRegister(), Inst.getRegister2());
+ OutStreamer->EmitCFIRegister(Inst.getRegister(), Inst.getRegister2());
break;
case MCCFIInstruction::OpWindowSave:
- OutStreamer.EmitCFIWindowSave();
+ OutStreamer->EmitCFIWindowSave();
break;
case MCCFIInstruction::OpSameValue:
- OutStreamer.EmitCFISameValue(Inst.getRegister());
+ OutStreamer->EmitCFISameValue(Inst.getRegister());
break;
+ case MCCFIInstruction::OpGnuArgsSize:
+ OutStreamer->EmitCFIGnuArgsSize(Inst.getOffset());
+ break;
+ case MCCFIInstruction::OpEscape:
+ OutStreamer->EmitCFIEscape(Inst.getValues());
+ break;
+ }
+}
+
+void AsmPrinter::emitDwarfDIE(const DIE &Die) const {
+ // Emit the code (index) for the abbreviation.
+ if (isVerbose())
+ OutStreamer->AddComment("Abbrev [" + Twine(Die.getAbbrevNumber()) + "] 0x" +
+ Twine::utohexstr(Die.getOffset()) + ":0x" +
+ Twine::utohexstr(Die.getSize()) + " " +
+ dwarf::TagString(Die.getTag()));
+ EmitULEB128(Die.getAbbrevNumber());
+
+ // Emit the DIE attribute values.
+ for (const auto &V : Die.values()) {
+ dwarf::Attribute Attr = V.getAttribute();
+ assert(V.getForm() && "Too many attributes for DIE (check abbreviation)");
+
+ if (isVerbose()) {
+ OutStreamer->AddComment(dwarf::AttributeString(Attr));
+ if (Attr == dwarf::DW_AT_accessibility)
+ OutStreamer->AddComment(
+ dwarf::AccessibilityString(V.getDIEInteger().getValue()));
+ }
+
+ // Emit an attribute using the defined form.
+ V.EmitValue(this);
}
+
+ // Emit the DIE children if any.
+ if (Die.hasChildren()) {
+ for (auto &Child : Die.children())
+ emitDwarfDIE(Child);
+
+ OutStreamer->AddComment("End Of Children Mark");
+ EmitInt8(0);
+ }
+}
+
+void
+AsmPrinter::emitDwarfAbbrevs(const std::vector<DIEAbbrev *>& Abbrevs) const {
+ // For each abbreviation.
+ for (const DIEAbbrev *Abbrev : Abbrevs) {
+ // Emit the abbreviations code (base 1 index.)
+ EmitULEB128(Abbrev->getNumber(), "Abbreviation Code");
+
+ // Emit the abbreviations data.
+ Abbrev->Emit(this);
+ }
+
+ // Mark end of abbreviations.
+ EmitULEB128(0, "EOM(3)");
}
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