//
//===----------------------------------------------------------------------===//
-#define DEBUG_TYPE "asm-printer"
+#include "ByteStreamer.h"
+#include "DwarfDebug.h"
+#include "DwarfExpression.h"
+#include "llvm/ADT/Twine.h"
#include "llvm/CodeGen/AsmPrinter.h"
-#include "llvm/MC/MachineLocation.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/DataLayout.h"
-#include "llvm/Target/TargetFrameLowering.h"
-#include "llvm/Target/TargetLoweringObjectFile.h"
-#include "llvm/Target/TargetMachine.h"
-#include "llvm/Target/TargetRegisterInfo.h"
-#include "llvm/ADT/Twine.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"
+
//===----------------------------------------------------------------------===//
// Dwarf Emission Helper Routines
//===----------------------------------------------------------------------===//
/// EmitSLEB128 - emit the specified signed leb128 value.
-void AsmPrinter::EmitSLEB128(int Value, const char *Desc) const {
+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.
-void AsmPrinter::EmitULEB128(unsigned Value, const char *Desc,
+/// 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.EmitULEB128IntValue(Value, 0/*addrspace*/, PadTo);
-}
+ OutStreamer->AddComment(Desc);
-/// 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, 0/*addrspace*/);
+ OutStreamer->EmitULEB128IntValue(Value, PadTo);
}
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:
+ 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:
+ 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:
+ 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:
+ case dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata8
+ :
return "indirect pcrel sdata8";
}
-
+
return "<unknown encoding>";
}
-
/// EmitEncodingByte - Emit a .byte 42 directive that corresponds to an
/// 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) const {
if (isVerbose()) {
- if (Desc != 0)
- OutStreamer.AddComment(Twine(Desc)+" Encoding = " +
- Twine(DecodeDWARFEncoding(Val)));
+ if (Desc)
+ 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, 0/*addrspace*/);
+
+ OutStreamer->EmitIntValue(Val, 1);
}
/// GetSizeOfEncodedValue - Return the size of the encoding in bytes.
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;
+ default:
+ llvm_unreachable("Invalid encoded value.");
+ case dwarf::DW_EH_PE_absptr:
+ return MF->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{
+void AsmPrinter::EmitTTypeReference(const GlobalValue *GV,
+ unsigned Encoding) const {
if (GV) {
const TargetLoweringObjectFile &TLOF = getObjFileLowering();
-
+
const MCExpr *Exp =
- TLOF.getTTypeGlobalReference(GV, Mang, MMI, Encoding, OutStreamer);
- OutStreamer.EmitValue(Exp, GetSizeOfEncodedValue(Encoding), /*addrspace*/0);
+ TLOF.getTTypeGlobalReference(GV, Encoding, *Mang, TM, MMI,
+ *OutStreamer);
+ OutStreamer->EmitValue(Exp, GetSizeOfEncodedValue(Encoding));
} else
- OutStreamer.EmitIntValue(0, GetSizeOfEncodedValue(Encoding), 0);
+ 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->getDwarfSectionOffsetDirective()) {
- OutStreamer.EmitCOFFSecRel32(Label);
+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, Label->getSection().getBeginSymbol(), 4);
+}
+
+void AsmPrinter::emitDwarfStringOffset(DwarfStringPoolEntryRef S) const {
+ if (MAI->doesDwarfUseRelocationsAcrossSections()) {
+ emitDwarfSymbolReference(S.getSymbol());
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, 0/*AddrSpace*/);
+
+ // 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) 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 (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
+ // mature.
+ return Expr.EmitOp(dwarf::DW_OP_nop,
+ "nop (could not find a dwarf register number)");
+
+ // Attempt to find a valid super- or sub-register.
+ if (!Expr.AddMachineRegPiece(MLoc.getReg()))
+ Expr.EmitOp(dwarf::DW_OP_nop,
+ "nop (could not find a dwarf register number)");
return;
}
-
- // Otherwise, emit it as a label difference from the start of the section.
- EmitLabelDifference(Label, SectionLabel, 4);
+
+ if (MLoc.isIndirect())
+ Expr.AddRegIndirect(Reg, MLoc.getOffset());
+ else
+ Expr.AddReg(Reg);
}
//===----------------------------------------------------------------------===//
// Dwarf Lowering Routines
//===----------------------------------------------------------------------===//
-/// EmitCFIFrameMove - Emit a frame instruction.
-void AsmPrinter::EmitCFIFrameMove(const MachineMove &Move) const {
- const TargetRegisterInfo *RI = TM.getRegisterInfo();
-
- const MachineLocation &Dst = Move.getDestination();
- const MachineLocation &Src = Move.getSource();
-
- // If advancing cfa.
- if (Dst.isReg() && Dst.getReg() == MachineLocation::VirtualFP) {
- if (Src.getReg() == MachineLocation::VirtualFP) {
- OutStreamer.EmitCFIDefCfaOffset(-Src.getOffset());
- } else {
- // Reg + Offset
- OutStreamer.EmitCFIDefCfa(RI->getDwarfRegNum(Src.getReg(), true),
- Src.getOffset());
+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::OpAdjustCfaOffset:
+ OutStreamer->EmitCFIAdjustCfaOffset(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::OpRegister:
+ OutStreamer->EmitCFIRegister(Inst.getRegister(), Inst.getRegister2());
+ break;
+ case MCCFIInstruction::OpWindowSave:
+ OutStreamer->EmitCFIWindowSave();
+ break;
+ case MCCFIInstruction::OpSameValue:
+ 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()));
}
- } else if (Src.isReg() && Src.getReg() == MachineLocation::VirtualFP) {
- assert(Dst.isReg() && "Machine move not supported yet.");
- OutStreamer.EmitCFIDefCfaRegister(RI->getDwarfRegNum(Dst.getReg(), true));
- } else {
- assert(!Dst.isReg() && "Machine move not supported yet.");
- OutStreamer.EmitCFIOffset(RI->getDwarfRegNum(Src.getReg(), true),
- Dst.getOffset());
+
+ // 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::emitDwarfAbbrev(const DIEAbbrev &Abbrev) const {
+ // Emit the abbreviations code (base 1 index.)
+ EmitULEB128(Abbrev.getNumber(), "Abbreviation Code");
+
+ // Emit the abbreviations data.
+ Abbrev.Emit(this);
}