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Imported Upstream version 5.18.0.167

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Former-commit-id: 289509151e0fee68a1b591a20c9f109c3c789d3a
This commit is contained in:
Xamarin Public Jenkins (auto-signing)
2018-10-20 08:25:10 +00:00
parent e19d552987
commit b084638f15
28489 changed files with 184 additions and 3866856 deletions
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133
external/llvm/lib/CodeGen/AsmPrinter/ARMException.cpp vendored
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//===-- CodeGen/AsmPrinter/ARMException.cpp - ARM EHABI Exception Impl ----===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file contains support for writing DWARF exception info into asm files.
//
//===----------------------------------------------------------------------===//
#include "DwarfException.h"
#include "llvm/ADT/Twine.h"
#include "llvm/CodeGen/AsmPrinter.h"
#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/IR/DataLayout.h"
#include "llvm/IR/Mangler.h"
#include "llvm/IR/Module.h"
#include "llvm/MC/MCAsmInfo.h"
#include "llvm/MC/MCExpr.h"
#include "llvm/MC/MCSection.h"
#include "llvm/MC/MCStreamer.h"
#include "llvm/MC/MCSymbol.h"
#include "llvm/Support/FormattedStream.h"
#include "llvm/Target/TargetOptions.h"
using namespace llvm;
ARMException::ARMException(AsmPrinter *A) : DwarfCFIExceptionBase(A) {}
ARMException::~ARMException() {}
ARMTargetStreamer &ARMException::getTargetStreamer() {
MCTargetStreamer &TS = *Asm->OutStreamer->getTargetStreamer();
return static_cast<ARMTargetStreamer &>(TS);
}
void ARMException::beginFunction(const MachineFunction *MF) {
if (Asm->MAI->getExceptionHandlingType() == ExceptionHandling::ARM)
getTargetStreamer().emitFnStart();
// See if we need call frame info.
AsmPrinter::CFIMoveType MoveType = Asm->needsCFIMoves();
assert(MoveType != AsmPrinter::CFI_M_EH &&
"non-EH CFI not yet supported in prologue with EHABI lowering");
if (MoveType == AsmPrinter::CFI_M_Debug) {
if (!hasEmittedCFISections) {
if (Asm->needsOnlyDebugCFIMoves())
Asm->OutStreamer->EmitCFISections(false, true);
hasEmittedCFISections = true;
}
shouldEmitCFI = true;
Asm->OutStreamer->EmitCFIStartProc(false);
}
}
/// endFunction - Gather and emit post-function exception information.
///
void ARMException::endFunction(const MachineFunction *MF) {
ARMTargetStreamer &ATS = getTargetStreamer();
const Function &F = MF->getFunction();
const Function *Per = nullptr;
if (F.hasPersonalityFn())
Per = dyn_cast<Function>(F.getPersonalityFn()->stripPointerCasts());
bool forceEmitPersonality =
F.hasPersonalityFn() && !isNoOpWithoutInvoke(classifyEHPersonality(Per)) &&
F.needsUnwindTableEntry();
bool shouldEmitPersonality = forceEmitPersonality ||
!MF->getLandingPads().empty();
if (!Asm->MF->getFunction().needsUnwindTableEntry() &&
!shouldEmitPersonality)
ATS.emitCantUnwind();
else if (shouldEmitPersonality) {
// Emit references to personality.
if (Per) {
MCSymbol *PerSym = Asm->getSymbol(Per);
Asm->OutStreamer->EmitSymbolAttribute(PerSym, MCSA_Global);
ATS.emitPersonality(PerSym);
}
// Emit .handlerdata directive.
ATS.emitHandlerData();
// Emit actual exception table
emitExceptionTable();
}
if (Asm->MAI->getExceptionHandlingType() == ExceptionHandling::ARM)
ATS.emitFnEnd();
}
void ARMException::emitTypeInfos(unsigned TTypeEncoding) {
const MachineFunction *MF = Asm->MF;
const std::vector<const GlobalValue *> &TypeInfos = MF->getTypeInfos();
const std::vector<unsigned> &FilterIds = MF->getFilterIds();
bool VerboseAsm = Asm->OutStreamer->isVerboseAsm();
int Entry = 0;
// Emit the Catch TypeInfos.
if (VerboseAsm && !TypeInfos.empty()) {
Asm->OutStreamer->AddComment(">> Catch TypeInfos <<");
Asm->OutStreamer->AddBlankLine();
Entry = TypeInfos.size();
}
for (const GlobalValue *GV : reverse(TypeInfos)) {
if (VerboseAsm)
Asm->OutStreamer->AddComment("TypeInfo " + Twine(Entry--));
Asm->EmitTTypeReference(GV, TTypeEncoding);
}
// Emit the Exception Specifications.
if (VerboseAsm && !FilterIds.empty()) {
Asm->OutStreamer->AddComment(">> Filter TypeInfos <<");
Asm->OutStreamer->AddBlankLine();
Entry = 0;
}
for (std::vector<unsigned>::const_iterator
I = FilterIds.begin(), E = FilterIds.end(); I < E; ++I) {
unsigned TypeID = *I;
if (VerboseAsm) {
--Entry;
if (TypeID != 0)
Asm->OutStreamer->AddComment("FilterInfo " + Twine(Entry));
}
Asm->EmitTTypeReference((TypeID == 0 ? nullptr : TypeInfos[TypeID - 1]),
TTypeEncoding);
}
}

46
external/llvm/lib/CodeGen/AsmPrinter/AddressPool.cpp vendored
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//===- llvm/CodeGen/AddressPool.cpp - Dwarf Debug Framework ---------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "AddressPool.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/CodeGen/AsmPrinter.h"
#include "llvm/CodeGen/TargetLoweringObjectFile.h"
#include "llvm/IR/DataLayout.h"
#include "llvm/MC/MCStreamer.h"
#include <utility>
using namespace llvm;
unsigned AddressPool::getIndex(const MCSymbol *Sym, bool TLS) {
HasBeenUsed = true;
auto IterBool =
Pool.insert(std::make_pair(Sym, AddressPoolEntry(Pool.size(), TLS)));
return IterBool.first->second.Number;
}
// Emit addresses into the section given.
void AddressPool::emit(AsmPrinter &Asm, MCSection *AddrSection) {
if (Pool.empty())
return;
// Start the dwarf addr section.
Asm.OutStreamer->SwitchSection(AddrSection);
// Order the address pool entries by ID
SmallVector<const MCExpr *, 64> Entries(Pool.size());
for (const auto &I : Pool)
Entries[I.second.Number] =
I.second.TLS
? Asm.getObjFileLowering().getDebugThreadLocalSymbol(I.first)
: MCSymbolRefExpr::create(I.first, Asm.OutContext);
for (const MCExpr *Entry : Entries)
Asm.OutStreamer->EmitValue(Entry, Asm.getDataLayout().getPointerSize());
}

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external/llvm/lib/CodeGen/AsmPrinter/AddressPool.h vendored
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//===- llvm/CodeGen/AddressPool.h - Dwarf Debug Framework -------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_LIB_CODEGEN_ASMPRINTER_ADDRESSPOOL_H
#define LLVM_LIB_CODEGEN_ASMPRINTER_ADDRESSPOOL_H
#include "llvm/ADT/DenseMap.h"
namespace llvm {
class AsmPrinter;
class MCSection;
class MCSymbol;
// Collection of addresses for this unit and assorted labels.
// A Symbol->unsigned mapping of addresses used by indirect
// references.
class AddressPool {
struct AddressPoolEntry {
unsigned Number;
bool TLS;
AddressPoolEntry(unsigned Number, bool TLS) : Number(Number), TLS(TLS) {}
};
DenseMap<const MCSymbol *, AddressPoolEntry> Pool;
/// Record whether the AddressPool has been queried for an address index since
/// the last "resetUsedFlag" call. Used to implement type unit fallback - a
/// type that references addresses cannot be placed in a type unit when using
/// fission.
bool HasBeenUsed = false;
public:
AddressPool() = default;
/// \brief Returns the index into the address pool with the given
/// label/symbol.
unsigned getIndex(const MCSymbol *Sym, bool TLS = false);
void emit(AsmPrinter &Asm, MCSection *AddrSection);
bool isEmpty() { return Pool.empty(); }
bool hasBeenUsed() const { return HasBeenUsed; }
void resetUsedFlag() { HasBeenUsed = false; }
};
} // end namespace llvm
#endif // LLVM_LIB_CODEGEN_ASMPRINTER_ADDRESSPOOL_H

1
external/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp.REMOVED.git-id vendored
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bf36cccd750b62edff26214e0b80f7bf2db27d68

265
external/llvm/lib/CodeGen/AsmPrinter/AsmPrinterDwarf.cpp vendored
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//===-- AsmPrinterDwarf.cpp - AsmPrinter Dwarf Support --------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file implements the Dwarf emissions parts of AsmPrinter.
//
//===----------------------------------------------------------------------===//
#include "ByteStreamer.h"
#include "llvm/ADT/Twine.h"
#include "llvm/BinaryFormat/Dwarf.h"
#include "llvm/CodeGen/AsmPrinter.h"
#include "llvm/CodeGen/DIE.h"
#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/CodeGen/TargetLoweringObjectFile.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/ErrorHandling.h"
#include "llvm/Target/TargetMachine.h"
using namespace llvm;
#define DEBUG_TYPE "asm-printer"
//===----------------------------------------------------------------------===//
// 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->EmitSLEB128IntValue(Value);
}
/// EmitULEB128 - emit the specified unsigned leb128 value.
void AsmPrinter::EmitPaddedULEB128(uint64_t Value, unsigned PadTo,
const char *Desc) const {
if (isVerbose() && Desc)
OutStreamer->AddComment(Desc);
OutStreamer->EmitPaddedULEB128IntValue(Value, PadTo);
}
void AsmPrinter::EmitULEB128(uint64_t Value, const char *Desc) const {
if (isVerbose() && Desc)
OutStreamer->AddComment(Desc);
OutStreamer->EmitULEB128IntValue(Value);
}
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>";
}
/// 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)
OutStreamer->AddComment(Twine(Desc) + " Encoding = " +
Twine(DecodeDWARFEncoding(Val)));
else
OutStreamer->AddComment(Twine("Encoding = ") + DecodeDWARFEncoding(Val));
}
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 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 {
if (GV) {
const TargetLoweringObjectFile &TLOF = getObjFileLowering();
const MCExpr *Exp =
TLOF.getTTypeGlobalReference(GV, Encoding, TM, MMI, *OutStreamer);
OutStreamer->EmitValue(Exp, GetSizeOfEncodedValue(Encoding));
} else
OutStreamer->EmitIntValue(0, GetSizeOfEncodedValue(Encoding));
}
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, /*Offset=*/0);
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;
}
// Just emit the offset directly; no need for symbol math.
EmitInt32(S.getOffset());
}
//===----------------------------------------------------------------------===//
// Dwarf Lowering Routines
//===----------------------------------------------------------------------===//
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;
case MCCFIInstruction::OpRestore:
OutStreamer->EmitCFIRestore(Inst.getRegister());
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::emitDwarfAbbrev(const DIEAbbrev &Abbrev) const {
// Emit the abbreviations code (base 1 index.)
EmitULEB128(Abbrev.getNumber(), "Abbreviation Code");
// Emit the abbreviations data.
Abbrev.Emit(this);
}

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external/llvm/lib/CodeGen/AsmPrinter/AsmPrinterHandler.h vendored
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//===-- lib/CodeGen/AsmPrinter/AsmPrinterHandler.h -------------*- C++ -*--===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file contains a generic interface for AsmPrinter handlers,
// like debug and EH info emitters.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_LIB_CODEGEN_ASMPRINTER_ASMPRINTERHANDLER_H
#define LLVM_LIB_CODEGEN_ASMPRINTER_ASMPRINTERHANDLER_H
#include "llvm/Support/DataTypes.h"
namespace llvm {
class AsmPrinter;
class MachineBasicBlock;
class MachineFunction;
class MachineInstr;
class MCSymbol;
typedef MCSymbol *ExceptionSymbolProvider(AsmPrinter *Asm);
/// \brief Collects and handles AsmPrinter objects required to build debug
/// or EH information.
class AsmPrinterHandler {
public:
virtual ~AsmPrinterHandler();
/// \brief For symbols that have a size designated (e.g. common symbols),
/// this tracks that size.
virtual void setSymbolSize(const MCSymbol *Sym, uint64_t Size) = 0;
/// \brief Emit all sections that should come after the content.
virtual void endModule() = 0;
/// \brief Gather pre-function debug information.
/// Every beginFunction(MF) call should be followed by an endFunction(MF)
/// call.
virtual void beginFunction(const MachineFunction *MF) = 0;
// \brief Emit any of function marker (like .cfi_endproc). This is called
// before endFunction and cannot switch sections.
virtual void markFunctionEnd();
/// \brief Gather post-function debug information.
/// Please note that some AsmPrinter implementations may not call
/// beginFunction at all.
virtual void endFunction(const MachineFunction *MF) = 0;
virtual void beginFragment(const MachineBasicBlock *MBB,
ExceptionSymbolProvider ESP) {}
virtual void endFragment() {}
/// \brief Emit target-specific EH funclet machinery.
virtual void beginFunclet(const MachineBasicBlock &MBB,
MCSymbol *Sym = nullptr) {}
virtual void endFunclet() {}
/// \brief Process beginning of an instruction.
virtual void beginInstruction(const MachineInstr *MI) = 0;
/// \brief Process end of an instruction.
virtual void endInstruction() = 0;
};
} // End of namespace llvm
#endif

605
external/llvm/lib/CodeGen/AsmPrinter/AsmPrinterInlineAsm.cpp vendored
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110
external/llvm/lib/CodeGen/AsmPrinter/ByteStreamer.h vendored
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//===-- llvm/CodeGen/ByteStreamer.h - ByteStreamer class --------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file contains a class that can take bytes that would normally be
// streamed via the AsmPrinter.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_LIB_CODEGEN_ASMPRINTER_BYTESTREAMER_H
#define LLVM_LIB_CODEGEN_ASMPRINTER_BYTESTREAMER_H
#include "DIEHash.h"
#include "llvm/CodeGen/AsmPrinter.h"
#include "llvm/MC/MCStreamer.h"
#include "llvm/Support/LEB128.h"
#include <string>
namespace llvm {
class ByteStreamer {
protected:
~ByteStreamer() = default;
ByteStreamer(const ByteStreamer&) = default;
ByteStreamer() = default;
public:
// For now we're just handling the calls we need for dwarf emission/hashing.
virtual void EmitInt8(uint8_t Byte, const Twine &Comment = "") = 0;
virtual void EmitSLEB128(uint64_t DWord, const Twine &Comment = "") = 0;
virtual void EmitULEB128(uint64_t DWord, const Twine &Comment = "") = 0;
};
class APByteStreamer final : public ByteStreamer {
private:
AsmPrinter &AP;
public:
APByteStreamer(AsmPrinter &Asm) : AP(Asm) {}
void EmitInt8(uint8_t Byte, const Twine &Comment) override {
AP.OutStreamer->AddComment(Comment);
AP.EmitInt8(Byte);
}
void EmitSLEB128(uint64_t DWord, const Twine &Comment) override {
AP.OutStreamer->AddComment(Comment);
AP.EmitSLEB128(DWord);
}
void EmitULEB128(uint64_t DWord, const Twine &Comment) override {
AP.OutStreamer->AddComment(Comment);
AP.EmitULEB128(DWord);
}
};
class HashingByteStreamer final : public ByteStreamer {
private:
DIEHash &Hash;
public:
HashingByteStreamer(DIEHash &H) : Hash(H) {}
void EmitInt8(uint8_t Byte, const Twine &Comment) override {
Hash.update(Byte);
}
void EmitSLEB128(uint64_t DWord, const Twine &Comment) override {
Hash.addSLEB128(DWord);
}
void EmitULEB128(uint64_t DWord, const Twine &Comment) override {
Hash.addULEB128(DWord);
}
};
class BufferByteStreamer final : public ByteStreamer {
private:
SmallVectorImpl<char> &Buffer;
SmallVectorImpl<std::string> &Comments;
/// \brief Only verbose textual output needs comments. This will be set to
/// true for that case, and false otherwise. If false, comments passed in to
/// the emit methods will be ignored.
bool GenerateComments;
public:
BufferByteStreamer(SmallVectorImpl<char> &Buffer,
SmallVectorImpl<std::string> &Comments,
bool GenerateComments)
: Buffer(Buffer), Comments(Comments), GenerateComments(GenerateComments) {}
void EmitInt8(uint8_t Byte, const Twine &Comment) override {
Buffer.push_back(Byte);
if (GenerateComments)
Comments.push_back(Comment.str());
}
void EmitSLEB128(uint64_t DWord, const Twine &Comment) override {
raw_svector_ostream OSE(Buffer);
encodeSLEB128(DWord, OSE);
if (GenerateComments)
Comments.push_back(Comment.str());
}
void EmitULEB128(uint64_t DWord, const Twine &Comment) override {
raw_svector_ostream OSE(Buffer);
encodeULEB128(DWord, OSE);
if (GenerateComments)
Comments.push_back(Comment.str());
}
};
}
#endif

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external/llvm/lib/CodeGen/AsmPrinter/CMakeLists.txt vendored
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add_llvm_library(LLVMAsmPrinter
AddressPool.cpp
ARMException.cpp
AsmPrinter.cpp
AsmPrinterDwarf.cpp
AsmPrinterInlineAsm.cpp
DbgValueHistoryCalculator.cpp
DebugHandlerBase.cpp
DebugLocStream.cpp
DIE.cpp
DIEHash.cpp
DwarfAccelTable.cpp
DwarfCFIException.cpp
DwarfCompileUnit.cpp
DwarfDebug.cpp
DwarfExpression.cpp
DwarfFile.cpp
DwarfStringPool.cpp
DwarfUnit.cpp
EHStreamer.cpp
ErlangGCPrinter.cpp
OcamlGCPrinter.cpp
WinException.cpp
CodeViewDebug.cpp
MonoException.cpp
DEPENDS
intrinsics_gen
)

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external/llvm/lib/CodeGen/AsmPrinter/CodeViewDebug.cpp vendored
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external/llvm/lib/CodeGen/AsmPrinter/CodeViewDebug.h vendored
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//===- llvm/lib/CodeGen/AsmPrinter/CodeViewDebug.h --------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file contains support for writing Microsoft CodeView debug info.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_LIB_CODEGEN_ASMPRINTER_CODEVIEWDEBUG_H
#define LLVM_LIB_CODEGEN_ASMPRINTER_CODEVIEWDEBUG_H
#include "DbgValueHistoryCalculator.h"
#include "DebugHandlerBase.h"
#include "llvm/ADT/ArrayRef.h"
#include "llvm/ADT/DenseMap.h"
#include "llvm/ADT/DenseSet.h"
#include "llvm/ADT/MapVector.h"
#include "llvm/ADT/SetVector.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/DebugInfo/CodeView/CodeView.h"
#include "llvm/DebugInfo/CodeView/GlobalTypeTableBuilder.h"
#include "llvm/DebugInfo/CodeView/TypeIndex.h"
#include "llvm/IR/DebugLoc.h"
#include "llvm/Support/Allocator.h"
#include "llvm/Support/Compiler.h"
#include <cstdint>
#include <map>
#include <string>
#include <tuple>
#include <unordered_map>
#include <utility>
#include <vector>
namespace llvm {
struct ClassInfo;
class StringRef;
class AsmPrinter;
class Function;
class GlobalVariable;
class MCSectionCOFF;
class MCStreamer;
class MCSymbol;
class MachineFunction;
/// \brief Collects and handles line tables information in a CodeView format.
class LLVM_LIBRARY_VISIBILITY CodeViewDebug : public DebugHandlerBase {
MCStreamer &OS;
BumpPtrAllocator Allocator;
codeview::GlobalTypeTableBuilder TypeTable;
/// Represents the most general definition range.
struct LocalVarDefRange {
/// Indicates that variable data is stored in memory relative to the
/// specified register.
int InMemory : 1;
/// Offset of variable data in memory.
int DataOffset : 31;
/// Non-zero if this is a piece of an aggregate.
uint16_t IsSubfield : 1;
/// Offset into aggregate.
uint16_t StructOffset : 15;
/// Register containing the data or the register base of the memory
/// location containing the data.
uint16_t CVRegister;
/// Compares all location fields. This includes all fields except the label
/// ranges.
bool isDifferentLocation(LocalVarDefRange &O) {
return InMemory != O.InMemory || DataOffset != O.DataOffset ||
IsSubfield != O.IsSubfield || StructOffset != O.StructOffset ||
CVRegister != O.CVRegister;
}
SmallVector<std::pair<const MCSymbol *, const MCSymbol *>, 1> Ranges;
};
static LocalVarDefRange createDefRangeMem(uint16_t CVRegister, int Offset);
static LocalVarDefRange createDefRangeGeneral(uint16_t CVRegister,
bool InMemory, int Offset,
bool IsSubfield,
uint16_t StructOffset);
/// Similar to DbgVariable in DwarfDebug, but not dwarf-specific.
struct LocalVariable {
const DILocalVariable *DIVar = nullptr;
SmallVector<LocalVarDefRange, 1> DefRanges;
bool UseReferenceType = false;
};
struct InlineSite {
SmallVector<LocalVariable, 1> InlinedLocals;
SmallVector<const DILocation *, 1> ChildSites;
const DISubprogram *Inlinee = nullptr;
/// The ID of the inline site or function used with .cv_loc. Not a type
/// index.
unsigned SiteFuncId = 0;
};
// For each function, store a vector of labels to its instructions, as well as
// to the end of the function.
struct FunctionInfo {
/// Map from inlined call site to inlined instructions and child inlined
/// call sites. Listed in program order.
std::unordered_map<const DILocation *, InlineSite> InlineSites;
/// Ordered list of top-level inlined call sites.
SmallVector<const DILocation *, 1> ChildSites;
SmallVector<LocalVariable, 1> Locals;
std::vector<std::pair<MCSymbol *, MDNode *>> Annotations;
const MCSymbol *Begin = nullptr;
const MCSymbol *End = nullptr;
unsigned FuncId = 0;
unsigned LastFileId = 0;
bool HaveLineInfo = false;
};
FunctionInfo *CurFn = nullptr;
/// The set of comdat .debug$S sections that we've seen so far. Each section
/// must start with a magic version number that must only be emitted once.
/// This set tracks which sections we've already opened.
DenseSet<MCSectionCOFF *> ComdatDebugSections;
/// Switch to the appropriate .debug$S section for GVSym. If GVSym, the symbol
/// of an emitted global value, is in a comdat COFF section, this will switch
/// to a new .debug$S section in that comdat. This method ensures that the
/// section starts with the magic version number on first use. If GVSym is
/// null, uses the main .debug$S section.
void switchToDebugSectionForSymbol(const MCSymbol *GVSym);
/// The next available function index for use with our .cv_* directives. Not
/// to be confused with type indices for LF_FUNC_ID records.
unsigned NextFuncId = 0;
InlineSite &getInlineSite(const DILocation *InlinedAt,
const DISubprogram *Inlinee);
codeview::TypeIndex getFuncIdForSubprogram(const DISubprogram *SP);
void calculateRanges(LocalVariable &Var,
const DbgValueHistoryMap::InstrRanges &Ranges);
static void collectInlineSiteChildren(SmallVectorImpl<unsigned> &Children,
const FunctionInfo &FI,
const InlineSite &Site);
/// Remember some debug info about each function. Keep it in a stable order to
/// emit at the end of the TU.
MapVector<const Function *, FunctionInfo> FnDebugInfo;
/// Map from full file path to .cv_file id. Full paths are built from DIFiles
/// and are stored in FileToFilepathMap;
DenseMap<StringRef, unsigned> FileIdMap;
/// All inlined subprograms in the order they should be emitted.
SmallSetVector<const DISubprogram *, 4> InlinedSubprograms;
/// Map from a pair of DI metadata nodes and its DI type (or scope) that can
/// be nullptr, to CodeView type indices. Primarily indexed by
/// {DIType*, DIType*} and {DISubprogram*, DIType*}.
///
/// The second entry in the key is needed for methods as DISubroutineType
/// representing static method type are shared with non-method function type.
DenseMap<std::pair<const DINode *, const DIType *>, codeview::TypeIndex>
TypeIndices;
/// Map from DICompositeType* to complete type index. Non-record types are
/// always looked up in the normal TypeIndices map.
DenseMap<const DICompositeType *, codeview::TypeIndex> CompleteTypeIndices;
/// Complete record types to emit after all active type lowerings are
/// finished.
SmallVector<const DICompositeType *, 4> DeferredCompleteTypes;
/// Number of type lowering frames active on the stack.
unsigned TypeEmissionLevel = 0;
codeview::TypeIndex VBPType;
const DISubprogram *CurrentSubprogram = nullptr;
// The UDTs we have seen while processing types; each entry is a pair of type
// index and type name.
std::vector<std::pair<std::string, const DIType *>> LocalUDTs;
std::vector<std::pair<std::string, const DIType *>> GlobalUDTs;
using FileToFilepathMapTy = std::map<const DIFile *, std::string>;
FileToFilepathMapTy FileToFilepathMap;
StringRef getFullFilepath(const DIFile *S);
unsigned maybeRecordFile(const DIFile *F);
void maybeRecordLocation(const DebugLoc &DL, const MachineFunction *MF);
void clear();
void setCurrentSubprogram(const DISubprogram *SP) {
CurrentSubprogram = SP;
LocalUDTs.clear();
}
/// Emit the magic version number at the start of a CodeView type or symbol
/// section. Appears at the front of every .debug$S or .debug$T section.
void emitCodeViewMagicVersion();
void emitTypeInformation();
void emitTypeGlobalHashes();
void emitCompilerInformation();
void emitInlineeLinesSubsection();
void emitDebugInfoForFunction(const Function *GV, FunctionInfo &FI);
void emitDebugInfoForGlobals();
void emitDebugInfoForRetainedTypes();
void
emitDebugInfoForUDTs(ArrayRef<std::pair<std::string, const DIType *>> UDTs);
void emitDebugInfoForGlobal(const DIGlobalVariable *DIGV,
const GlobalVariable *GV, MCSymbol *GVSym);
/// Opens a subsection of the given kind in a .debug$S codeview section.
/// Returns an end label for use with endCVSubsection when the subsection is
/// finished.
MCSymbol *beginCVSubsection(codeview::DebugSubsectionKind Kind);
void endCVSubsection(MCSymbol *EndLabel);
void emitInlinedCallSite(const FunctionInfo &FI, const DILocation *InlinedAt,
const InlineSite &Site);
using InlinedVariable = DbgValueHistoryMap::InlinedVariable;
void collectVariableInfo(const DISubprogram *SP);
void collectVariableInfoFromMFTable(DenseSet<InlinedVariable> &Processed);
/// Records information about a local variable in the appropriate scope. In
/// particular, locals from inlined code live inside the inlining site.
void recordLocalVariable(LocalVariable &&Var, const DILocation *Loc);
/// Emits local variables in the appropriate order.
void emitLocalVariableList(ArrayRef<LocalVariable> Locals);
/// Emits an S_LOCAL record and its associated defined ranges.
void emitLocalVariable(const LocalVariable &Var);
/// Translates the DIType to codeview if necessary and returns a type index
/// for it.
codeview::TypeIndex getTypeIndex(DITypeRef TypeRef,
DITypeRef ClassTyRef = DITypeRef());
codeview::TypeIndex getTypeIndexForReferenceTo(DITypeRef TypeRef);
codeview::TypeIndex getMemberFunctionType(const DISubprogram *SP,
const DICompositeType *Class);
codeview::TypeIndex getScopeIndex(const DIScope *Scope);
codeview::TypeIndex getVBPTypeIndex();
void addToUDTs(const DIType *Ty);
codeview::TypeIndex lowerType(const DIType *Ty, const DIType *ClassTy);
codeview::TypeIndex lowerTypeAlias(const DIDerivedType *Ty);
codeview::TypeIndex lowerTypeArray(const DICompositeType *Ty);
codeview::TypeIndex lowerTypeBasic(const DIBasicType *Ty);
codeview::TypeIndex lowerTypePointer(const DIDerivedType *Ty);
codeview::TypeIndex lowerTypeMemberPointer(const DIDerivedType *Ty);
codeview::TypeIndex lowerTypeModifier(const DIDerivedType *Ty);
codeview::TypeIndex lowerTypeFunction(const DISubroutineType *Ty);
codeview::TypeIndex lowerTypeVFTableShape(const DIDerivedType *Ty);
codeview::TypeIndex lowerTypeMemberFunction(const DISubroutineType *Ty,
const DIType *ClassTy,
int ThisAdjustment,
bool IsStaticMethod);
codeview::TypeIndex lowerTypeEnum(const DICompositeType *Ty);
codeview::TypeIndex lowerTypeClass(const DICompositeType *Ty);
codeview::TypeIndex lowerTypeUnion(const DICompositeType *Ty);
/// Symbol records should point to complete types, but type records should
/// always point to incomplete types to avoid cycles in the type graph. Only
/// use this entry point when generating symbol records. The complete and
/// incomplete type indices only differ for record types. All other types use
/// the same index.
codeview::TypeIndex getCompleteTypeIndex(DITypeRef TypeRef);
codeview::TypeIndex lowerCompleteTypeClass(const DICompositeType *Ty);
codeview::TypeIndex lowerCompleteTypeUnion(const DICompositeType *Ty);
struct TypeLoweringScope;
void emitDeferredCompleteTypes();
void collectMemberInfo(ClassInfo &Info, const DIDerivedType *DDTy);
ClassInfo collectClassInfo(const DICompositeType *Ty);
/// Common record member lowering functionality for record types, which are
/// structs, classes, and unions. Returns the field list index and the member
/// count.
std::tuple<codeview::TypeIndex, codeview::TypeIndex, unsigned, bool>
lowerRecordFieldList(const DICompositeType *Ty);
/// Inserts {{Node, ClassTy}, TI} into TypeIndices and checks for duplicates.
codeview::TypeIndex recordTypeIndexForDINode(const DINode *Node,
codeview::TypeIndex TI,
const DIType *ClassTy = nullptr);
unsigned getPointerSizeInBytes();
protected:
/// \brief Gather pre-function debug information.
void beginFunctionImpl(const MachineFunction *MF) override;
/// \brief Gather post-function debug information.
void endFunctionImpl(const MachineFunction *) override;
public:
CodeViewDebug(AsmPrinter *Asm);
void setSymbolSize(const MCSymbol *, uint64_t) override {}
/// \brief Emit the COFF section that holds the line table information.
void endModule() override;
/// \brief Process beginning of an instruction.
void beginInstruction(const MachineInstr *MI) override;
};
} // end namespace llvm
#endif // LLVM_LIB_CODEGEN_ASMPRINTER_CODEVIEWDEBUG_H

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//===-- llvm/CodeGen/DIEHash.cpp - Dwarf Hashing Framework ----------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file contains support for DWARF4 hashing of DIEs.
//
//===----------------------------------------------------------------------===//
#include "DIEHash.h"
#include "ByteStreamer.h"
#include "DwarfDebug.h"
#include "llvm/ADT/ArrayRef.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/BinaryFormat/Dwarf.h"
#include "llvm/CodeGen/AsmPrinter.h"
#include "llvm/CodeGen/DIE.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/Endian.h"
#include "llvm/Support/MD5.h"
#include "llvm/Support/raw_ostream.h"
using namespace llvm;
#define DEBUG_TYPE "dwarfdebug"
/// \brief Grabs the string in whichever attribute is passed in and returns
/// a reference to it.
static StringRef getDIEStringAttr(const DIE &Die, uint16_t Attr) {
// Iterate through all the attributes until we find the one we're
// looking for, if we can't find it return an empty string.
for (const auto &V : Die.values())
if (V.getAttribute() == Attr)
return V.getDIEString().getString();
return StringRef("");
}
/// \brief Adds the string in \p Str to the hash. This also hashes
/// a trailing NULL with the string.
void DIEHash::addString(StringRef Str) {
DEBUG(dbgs() << "Adding string " << Str << " to hash.\n");
Hash.update(Str);
Hash.update(makeArrayRef((uint8_t)'\0'));
}
// FIXME: The LEB128 routines are copied and only slightly modified out of
// LEB128.h.
/// \brief Adds the unsigned in \p Value to the hash encoded as a ULEB128.
void DIEHash::addULEB128(uint64_t Value) {
DEBUG(dbgs() << "Adding ULEB128 " << Value << " to hash.\n");
do {
uint8_t Byte = Value & 0x7f;
Value >>= 7;
if (Value != 0)
Byte |= 0x80; // Mark this byte to show that more bytes will follow.
Hash.update(Byte);
} while (Value != 0);
}
void DIEHash::addSLEB128(int64_t Value) {
DEBUG(dbgs() << "Adding ULEB128 " << Value << " to hash.\n");
bool More;
do {
uint8_t Byte = Value & 0x7f;
Value >>= 7;
More = !((((Value == 0) && ((Byte & 0x40) == 0)) ||
((Value == -1) && ((Byte & 0x40) != 0))));
if (More)
Byte |= 0x80; // Mark this byte to show that more bytes will follow.
Hash.update(Byte);
} while (More);
}
/// \brief Including \p Parent adds the context of Parent to the hash..
void DIEHash::addParentContext(const DIE &Parent) {
DEBUG(dbgs() << "Adding parent context to hash...\n");
// [7.27.2] For each surrounding type or namespace beginning with the
// outermost such construct...
SmallVector<const DIE *, 1> Parents;
const DIE *Cur = &Parent;
while (Cur->getParent()) {
Parents.push_back(Cur);
Cur = Cur->getParent();
}
assert(Cur->getTag() == dwarf::DW_TAG_compile_unit ||
Cur->getTag() == dwarf::DW_TAG_type_unit);
// Reverse iterate over our list to go from the outermost construct to the
// innermost.
for (SmallVectorImpl<const DIE *>::reverse_iterator I = Parents.rbegin(),
E = Parents.rend();
I != E; ++I) {
const DIE &Die = **I;
// ... Append the letter "C" to the sequence...
addULEB128('C');
// ... Followed by the DWARF tag of the construct...
addULEB128(Die.getTag());
// ... Then the name, taken from the DW_AT_name attribute.
StringRef Name = getDIEStringAttr(Die, dwarf::DW_AT_name);
DEBUG(dbgs() << "... adding context: " << Name << "\n");
if (!Name.empty())
addString(Name);
}
}
// Collect all of the attributes for a particular DIE in single structure.
void DIEHash::collectAttributes(const DIE &Die, DIEAttrs &Attrs) {
for (const auto &V : Die.values()) {
DEBUG(dbgs() << "Attribute: "
<< dwarf::AttributeString(V.getAttribute())
<< " added.\n");
switch (V.getAttribute()) {
#define HANDLE_DIE_HASH_ATTR(NAME) \
case dwarf::NAME: \
Attrs.NAME = V; \
break;
#include "DIEHashAttributes.def"
default:
break;
}
}
}
void DIEHash::hashShallowTypeReference(dwarf::Attribute Attribute,
const DIE &Entry, StringRef Name) {
// append the letter 'N'
addULEB128('N');
// the DWARF attribute code (DW_AT_type or DW_AT_friend),
addULEB128(Attribute);
// the context of the tag,
if (const DIE *Parent = Entry.getParent())
addParentContext(*Parent);
// the letter 'E',
addULEB128('E');
// and the name of the type.
addString(Name);
// Currently DW_TAG_friends are not used by Clang, but if they do become so,
// here's the relevant spec text to implement:
//
// For DW_TAG_friend, if the referenced entry is the DW_TAG_subprogram,
// the context is omitted and the name to be used is the ABI-specific name
// of the subprogram (e.g., the mangled linker name).
}
void DIEHash::hashRepeatedTypeReference(dwarf::Attribute Attribute,
unsigned DieNumber) {
// a) If T is in the list of [previously hashed types], use the letter
// 'R' as the marker
addULEB128('R');
addULEB128(Attribute);
// and use the unsigned LEB128 encoding of [the index of T in the
// list] as the attribute value;
addULEB128(DieNumber);
}
void DIEHash::hashDIEEntry(dwarf::Attribute Attribute, dwarf::Tag Tag,
const DIE &Entry) {
assert(Tag != dwarf::DW_TAG_friend && "No current LLVM clients emit friend "
"tags. Add support here when there's "
"a use case");
// Step 5
// If the tag in Step 3 is one of [the below tags]
if ((Tag == dwarf::DW_TAG_pointer_type ||
Tag == dwarf::DW_TAG_reference_type ||
Tag == dwarf::DW_TAG_rvalue_reference_type ||
Tag == dwarf::DW_TAG_ptr_to_member_type) &&
// and the referenced type (via the [below attributes])
// FIXME: This seems overly restrictive, and causes hash mismatches
// there's a decl/def difference in the containing type of a
// ptr_to_member_type, but it's what DWARF says, for some reason.
Attribute == dwarf::DW_AT_type) {
// ... has a DW_AT_name attribute,
StringRef Name = getDIEStringAttr(Entry, dwarf::DW_AT_name);
if (!Name.empty()) {
hashShallowTypeReference(Attribute, Entry, Name);
return;
}
}
unsigned &DieNumber = Numbering[&Entry];
if (DieNumber) {
hashRepeatedTypeReference(Attribute, DieNumber);
return;
}
// otherwise, b) use the letter 'T' as the marker, ...
addULEB128('T');
addULEB128(Attribute);
// ... process the type T recursively by performing Steps 2 through 7, and
// use the result as the attribute value.
DieNumber = Numbering.size();
computeHash(Entry);
}
// Hash all of the values in a block like set of values. This assumes that
// all of the data is going to be added as integers.
void DIEHash::hashBlockData(const DIE::const_value_range &Values) {
for (const auto &V : Values)
Hash.update((uint64_t)V.getDIEInteger().getValue());
}
// Hash the contents of a loclistptr class.
void DIEHash::hashLocList(const DIELocList &LocList) {
HashingByteStreamer Streamer(*this);
DwarfDebug &DD = *AP->getDwarfDebug();
const DebugLocStream &Locs = DD.getDebugLocs();
for (const auto &Entry : Locs.getEntries(Locs.getList(LocList.getValue())))
DD.emitDebugLocEntry(Streamer, Entry);
}
// Hash an individual attribute \param Attr based on the type of attribute and
// the form.
void DIEHash::hashAttribute(const DIEValue &Value, dwarf::Tag Tag) {
dwarf::Attribute Attribute = Value.getAttribute();
// Other attribute values use the letter 'A' as the marker, and the value
// consists of the form code (encoded as an unsigned LEB128 value) followed by
// the encoding of the value according to the form code. To ensure
// reproducibility of the signature, the set of forms used in the signature
// computation is limited to the following: DW_FORM_sdata, DW_FORM_flag,
// DW_FORM_string, and DW_FORM_block.
switch (Value.getType()) {
case DIEValue::isNone:
llvm_unreachable("Expected valid DIEValue");
// 7.27 Step 3
// ... An attribute that refers to another type entry T is processed as
// follows:
case DIEValue::isEntry:
hashDIEEntry(Attribute, Tag, Value.getDIEEntry().getEntry());
break;
case DIEValue::isInteger: {
addULEB128('A');
addULEB128(Attribute);
switch (Value.getForm()) {
case dwarf::DW_FORM_data1:
case dwarf::DW_FORM_data2:
case dwarf::DW_FORM_data4:
case dwarf::DW_FORM_data8:
case dwarf::DW_FORM_udata:
case dwarf::DW_FORM_sdata:
addULEB128(dwarf::DW_FORM_sdata);
addSLEB128((int64_t)Value.getDIEInteger().getValue());
break;
// DW_FORM_flag_present is just flag with a value of one. We still give it a
// value so just use the value.
case dwarf::DW_FORM_flag_present:
case dwarf::DW_FORM_flag:
addULEB128(dwarf::DW_FORM_flag);
addULEB128((int64_t)Value.getDIEInteger().getValue());
break;
default:
llvm_unreachable("Unknown integer form!");
}
break;
}
case DIEValue::isString:
addULEB128('A');
addULEB128(Attribute);
addULEB128(dwarf::DW_FORM_string);
addString(Value.getDIEString().getString());
break;
case DIEValue::isInlineString:
addULEB128('A');
addULEB128(Attribute);
addULEB128(dwarf::DW_FORM_string);
addString(Value.getDIEInlineString().getString());
break;
case DIEValue::isBlock:
case DIEValue::isLoc:
case DIEValue::isLocList:
addULEB128('A');
addULEB128(Attribute);
addULEB128(dwarf::DW_FORM_block);
if (Value.getType() == DIEValue::isBlock) {
addULEB128(Value.getDIEBlock().ComputeSize(AP));
hashBlockData(Value.getDIEBlock().values());
} else if (Value.getType() == DIEValue::isLoc) {
addULEB128(Value.getDIELoc().ComputeSize(AP));
hashBlockData(Value.getDIELoc().values());
} else {
// We could add the block length, but that would take
// a bit of work and not add a lot of uniqueness
// to the hash in some way we could test.
hashLocList(Value.getDIELocList());
}
break;
// FIXME: It's uncertain whether or not we should handle this at the moment.
case DIEValue::isExpr:
case DIEValue::isLabel:
case DIEValue::isDelta:
llvm_unreachable("Add support for additional value types.");
}
}
// Go through the attributes from \param Attrs in the order specified in 7.27.4
// and hash them.
void DIEHash::hashAttributes(const DIEAttrs &Attrs, dwarf::Tag Tag) {
#define HANDLE_DIE_HASH_ATTR(NAME) \
{ \
if (Attrs.NAME) \
hashAttribute(Attrs.NAME, Tag); \
}
#include "DIEHashAttributes.def"
// FIXME: Add the extended attributes.
}
// Add all of the attributes for \param Die to the hash.
void DIEHash::addAttributes(const DIE &Die) {
DIEAttrs Attrs = {};
collectAttributes(Die, Attrs);
hashAttributes(Attrs, Die.getTag());
}
void DIEHash::hashNestedType(const DIE &Die, StringRef Name) {
// 7.27 Step 7
// ... append the letter 'S',
addULEB128('S');
// the tag of C,
addULEB128(Die.getTag());
// and the name.
addString(Name);
}
// Compute the hash of a DIE. This is based on the type signature computation
// given in section 7.27 of the DWARF4 standard. It is the md5 hash of a
// flattened description of the DIE.
void DIEHash::computeHash(const DIE &Die) {
// Append the letter 'D', followed by the DWARF tag of the DIE.
addULEB128('D');
addULEB128(Die.getTag());
// Add each of the attributes of the DIE.
addAttributes(Die);
// Then hash each of the children of the DIE.
for (auto &C : Die.children()) {
// 7.27 Step 7
// If C is a nested type entry or a member function entry, ...
if (isType(C.getTag()) || C.getTag() == dwarf::DW_TAG_subprogram) {
StringRef Name = getDIEStringAttr(C, dwarf::DW_AT_name);
// ... and has a DW_AT_name attribute
if (!Name.empty()) {
hashNestedType(C, Name);
continue;
}
}
computeHash(C);
}
// Following the last (or if there are no children), append a zero byte.
Hash.update(makeArrayRef((uint8_t)'\0'));
}
/// This is based on the type signature computation given in section 7.27 of the
/// DWARF4 standard. It is an md5 hash of the flattened description of the DIE
/// with the inclusion of the full CU and all top level CU entities.
// TODO: Initialize the type chain at 0 instead of 1 for CU signatures.
uint64_t DIEHash::computeCUSignature(StringRef DWOName, const DIE &Die) {
Numbering.clear();
Numbering[&Die] = 1;
if (!DWOName.empty())
Hash.update(DWOName);
// Hash the DIE.
computeHash(Die);
// Now return the result.
MD5::MD5Result Result;
Hash.final(Result);
// ... take the least significant 8 bytes and return those. Our MD5
// implementation always returns its results in little endian, so we actually
// need the "high" word.
return Result.high();
}
/// This is based on the type signature computation given in section 7.27 of the
/// DWARF4 standard. It is an md5 hash of the flattened description of the DIE
/// with the inclusion of additional forms not specifically called out in the
/// standard.
uint64_t DIEHash::computeTypeSignature(const DIE &Die) {
Numbering.clear();
Numbering[&Die] = 1;
if (const DIE *Parent = Die.getParent())
addParentContext(*Parent);
// Hash the DIE.
computeHash(Die);
// Now return the result.
MD5::MD5Result Result;
Hash.final(Result);
// ... take the least significant 8 bytes and return those. Our MD5
// implementation always returns its results in little endian, so we actually
// need the "high" word.
return Result.high();
}

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external/llvm/lib/CodeGen/AsmPrinter/DIEHash.h vendored
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//===-- llvm/CodeGen/DIEHash.h - Dwarf Hashing Framework -------*- C++ -*--===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file contains support for DWARF4 hashing of DIEs.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_LIB_CODEGEN_ASMPRINTER_DIEHASH_H
#define LLVM_LIB_CODEGEN_ASMPRINTER_DIEHASH_H
#include "llvm/ADT/DenseMap.h"
#include "llvm/CodeGen/DIE.h"
#include "llvm/Support/MD5.h"
namespace llvm {
class AsmPrinter;
class CompileUnit;
/// \brief An object containing the capability of hashing and adding hash
/// attributes onto a DIE.
class DIEHash {
// Collection of all attributes used in hashing a particular DIE.
struct DIEAttrs {
#define HANDLE_DIE_HASH_ATTR(NAME) DIEValue NAME;
#include "DIEHashAttributes.def"
};
public:
DIEHash(AsmPrinter *A = nullptr) : AP(A) {}
/// \brief Computes the CU signature.
uint64_t computeCUSignature(StringRef DWOName, const DIE &Die);
/// \brief Computes the type signature.
uint64_t computeTypeSignature(const DIE &Die);
// Helper routines to process parts of a DIE.
private:
/// \brief Adds the parent context of \param Die to the hash.
void addParentContext(const DIE &Die);
/// \brief Adds the attributes of \param Die to the hash.
void addAttributes(const DIE &Die);
/// \brief Computes the full DWARF4 7.27 hash of the DIE.
void computeHash(const DIE &Die);
// Routines that add DIEValues to the hash.
public:
/// \brief Adds \param Value to the hash.
void update(uint8_t Value) { Hash.update(Value); }
/// \brief Encodes and adds \param Value to the hash as a ULEB128.
void addULEB128(uint64_t Value);
/// \brief Encodes and adds \param Value to the hash as a SLEB128.
void addSLEB128(int64_t Value);
private:
/// \brief Adds \param Str to the hash and includes a NULL byte.
void addString(StringRef Str);
/// \brief Collects the attributes of DIE \param Die into the \param Attrs
/// structure.
void collectAttributes(const DIE &Die, DIEAttrs &Attrs);
/// \brief Hashes the attributes in \param Attrs in order.
void hashAttributes(const DIEAttrs &Attrs, dwarf::Tag Tag);
/// \brief Hashes the data in a block like DIEValue, e.g. DW_FORM_block or
/// DW_FORM_exprloc.
void hashBlockData(const DIE::const_value_range &Values);
/// \brief Hashes the contents pointed to in the .debug_loc section.
void hashLocList(const DIELocList &LocList);
/// \brief Hashes an individual attribute.
void hashAttribute(const DIEValue &Value, dwarf::Tag Tag);
/// \brief Hashes an attribute that refers to another DIE.
void hashDIEEntry(dwarf::Attribute Attribute, dwarf::Tag Tag,
const DIE &Entry);
/// \brief Hashes a reference to a named type in such a way that is
/// independent of whether that type is described by a declaration or a
/// definition.
void hashShallowTypeReference(dwarf::Attribute Attribute, const DIE &Entry,
StringRef Name);
/// \brief Hashes a reference to a previously referenced type DIE.
void hashRepeatedTypeReference(dwarf::Attribute Attribute,
unsigned DieNumber);
void hashNestedType(const DIE &Die, StringRef Name);
private:
MD5 Hash;
AsmPrinter *AP;
DenseMap<const DIE *, unsigned> Numbering;
};
}
#endif

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external/llvm/lib/CodeGen/AsmPrinter/DIEHashAttributes.def vendored
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#ifndef HANDLE_DIE_HASH_ATTR
#error "Missing macro definition of HANDLE_DIE_HASH_ATTR"
#endif
HANDLE_DIE_HASH_ATTR(DW_AT_name)
HANDLE_DIE_HASH_ATTR(DW_AT_accessibility)
HANDLE_DIE_HASH_ATTR(DW_AT_address_class)
HANDLE_DIE_HASH_ATTR(DW_AT_allocated)
HANDLE_DIE_HASH_ATTR(DW_AT_artificial)
HANDLE_DIE_HASH_ATTR(DW_AT_associated)
HANDLE_DIE_HASH_ATTR(DW_AT_binary_scale)
HANDLE_DIE_HASH_ATTR(DW_AT_bit_offset)
HANDLE_DIE_HASH_ATTR(DW_AT_bit_size)
HANDLE_DIE_HASH_ATTR(DW_AT_bit_stride)
HANDLE_DIE_HASH_ATTR(DW_AT_byte_size)
HANDLE_DIE_HASH_ATTR(DW_AT_byte_stride)
HANDLE_DIE_HASH_ATTR(DW_AT_const_expr)
HANDLE_DIE_HASH_ATTR(DW_AT_const_value)
HANDLE_DIE_HASH_ATTR(DW_AT_containing_type)
HANDLE_DIE_HASH_ATTR(DW_AT_count)
HANDLE_DIE_HASH_ATTR(DW_AT_data_bit_offset)
HANDLE_DIE_HASH_ATTR(DW_AT_data_location)
HANDLE_DIE_HASH_ATTR(DW_AT_data_member_location)
HANDLE_DIE_HASH_ATTR(DW_AT_decimal_scale)
HANDLE_DIE_HASH_ATTR(DW_AT_decimal_sign)
HANDLE_DIE_HASH_ATTR(DW_AT_default_value)
HANDLE_DIE_HASH_ATTR(DW_AT_digit_count)
HANDLE_DIE_HASH_ATTR(DW_AT_discr)
HANDLE_DIE_HASH_ATTR(DW_AT_discr_list)
HANDLE_DIE_HASH_ATTR(DW_AT_discr_value)
HANDLE_DIE_HASH_ATTR(DW_AT_encoding)
HANDLE_DIE_HASH_ATTR(DW_AT_enum_class)
HANDLE_DIE_HASH_ATTR(DW_AT_endianity)
HANDLE_DIE_HASH_ATTR(DW_AT_explicit)
HANDLE_DIE_HASH_ATTR(DW_AT_is_optional)
HANDLE_DIE_HASH_ATTR(DW_AT_location)
HANDLE_DIE_HASH_ATTR(DW_AT_lower_bound)
HANDLE_DIE_HASH_ATTR(DW_AT_mutable)
HANDLE_DIE_HASH_ATTR(DW_AT_ordering)
HANDLE_DIE_HASH_ATTR(DW_AT_picture_string)
HANDLE_DIE_HASH_ATTR(DW_AT_prototyped)
HANDLE_DIE_HASH_ATTR(DW_AT_small)
HANDLE_DIE_HASH_ATTR(DW_AT_segment)
HANDLE_DIE_HASH_ATTR(DW_AT_string_length)
HANDLE_DIE_HASH_ATTR(DW_AT_threads_scaled)
HANDLE_DIE_HASH_ATTR(DW_AT_upper_bound)
HANDLE_DIE_HASH_ATTR(DW_AT_use_location)
HANDLE_DIE_HASH_ATTR(DW_AT_use_UTF8)
HANDLE_DIE_HASH_ATTR(DW_AT_variable_parameter)
HANDLE_DIE_HASH_ATTR(DW_AT_virtuality)
HANDLE_DIE_HASH_ATTR(DW_AT_visibility)
HANDLE_DIE_HASH_ATTR(DW_AT_vtable_elem_location)
HANDLE_DIE_HASH_ATTR(DW_AT_type)
#undef HANDLE_DIE_HASH_ATTR

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external/llvm/lib/CodeGen/AsmPrinter/DbgValueHistoryCalculator.cpp vendored
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//===- llvm/CodeGen/AsmPrinter/DbgValueHistoryCalculator.cpp --------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "DbgValueHistoryCalculator.h"
#include "llvm/ADT/BitVector.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/CodeGen/MachineBasicBlock.h"
#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/CodeGen/MachineInstr.h"
#include "llvm/CodeGen/MachineOperand.h"
#include "llvm/CodeGen/TargetLowering.h"
#include "llvm/CodeGen/TargetRegisterInfo.h"
#include "llvm/CodeGen/TargetSubtargetInfo.h"
#include "llvm/IR/DebugInfoMetadata.h"
#include "llvm/IR/DebugLoc.h"
#include "llvm/MC/MCRegisterInfo.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/raw_ostream.h"
#include <cassert>
#include <map>
#include <utility>
using namespace llvm;
#define DEBUG_TYPE "dwarfdebug"
// \brief If @MI is a DBG_VALUE with debug value described by a
// defined register, returns the number of this register.
// In the other case, returns 0.
static unsigned isDescribedByReg(const MachineInstr &MI) {
assert(MI.isDebugValue());
assert(MI.getNumOperands() == 4);
// If location of variable is described using a register (directly or
// indirectly), this register is always a first operand.
return MI.getOperand(0).isReg() ? MI.getOperand(0).getReg() : 0;
}
void DbgValueHistoryMap::startInstrRange(InlinedVariable Var,
const MachineInstr &MI) {
// Instruction range should start with a DBG_VALUE instruction for the
// variable.
assert(MI.isDebugValue() && "not a DBG_VALUE");
auto &Ranges = VarInstrRanges[Var];
if (!Ranges.empty() && Ranges.back().second == nullptr &&
Ranges.back().first->isIdenticalTo(MI)) {
DEBUG(dbgs() << "Coalescing identical DBG_VALUE entries:\n"
<< "\t" << Ranges.back().first << "\t" << MI << "\n");
return;
}
Ranges.push_back(std::make_pair(&MI, nullptr));
}
void DbgValueHistoryMap::endInstrRange(InlinedVariable Var,
const MachineInstr &MI) {
auto &Ranges = VarInstrRanges[Var];
// Verify that the current instruction range is not yet closed.
assert(!Ranges.empty() && Ranges.back().second == nullptr);
// For now, instruction ranges are not allowed to cross basic block
// boundaries.
assert(Ranges.back().first->getParent() == MI.getParent());
Ranges.back().second = &MI;
}
unsigned DbgValueHistoryMap::getRegisterForVar(InlinedVariable Var) const {
const auto &I = VarInstrRanges.find(Var);
if (I == VarInstrRanges.end())
return 0;
const auto &Ranges = I->second;
if (Ranges.empty() || Ranges.back().second != nullptr)
return 0;
return isDescribedByReg(*Ranges.back().first);
}
namespace {
// Maps physreg numbers to the variables they describe.
using InlinedVariable = DbgValueHistoryMap::InlinedVariable;
using RegDescribedVarsMap = std::map<unsigned, SmallVector<InlinedVariable, 1>>;
} // end anonymous namespace
// \brief Claim that @Var is not described by @RegNo anymore.
static void dropRegDescribedVar(RegDescribedVarsMap &RegVars, unsigned RegNo,
InlinedVariable Var) {
const auto &I = RegVars.find(RegNo);
assert(RegNo != 0U && I != RegVars.end());
auto &VarSet = I->second;
const auto &VarPos = llvm::find(VarSet, Var);
assert(VarPos != VarSet.end());
VarSet.erase(VarPos);
// Don't keep empty sets in a map to keep it as small as possible.
if (VarSet.empty())
RegVars.erase(I);
}
// \brief Claim that @Var is now described by @RegNo.
static void addRegDescribedVar(RegDescribedVarsMap &RegVars, unsigned RegNo,
InlinedVariable Var) {
assert(RegNo != 0U);
auto &VarSet = RegVars[RegNo];
assert(!is_contained(VarSet, Var));
VarSet.push_back(Var);
}
// \brief Terminate the location range for variables described by register at
// @I by inserting @ClobberingInstr to their history.
static void clobberRegisterUses(RegDescribedVarsMap &RegVars,
RegDescribedVarsMap::iterator I,
DbgValueHistoryMap &HistMap,
const MachineInstr &ClobberingInstr) {
// Iterate over all variables described by this register and add this
// instruction to their history, clobbering it.
for (const auto &Var : I->second)
HistMap.endInstrRange(Var, ClobberingInstr);
RegVars.erase(I);
}
// \brief Terminate the location range for variables described by register
// @RegNo by inserting @ClobberingInstr to their history.
static void clobberRegisterUses(RegDescribedVarsMap &RegVars, unsigned RegNo,
DbgValueHistoryMap &HistMap,
const MachineInstr &ClobberingInstr) {
const auto &I = RegVars.find(RegNo);
if (I == RegVars.end())
return;
clobberRegisterUses(RegVars, I, HistMap, ClobberingInstr);
}
// \brief Returns the first instruction in @MBB which corresponds to
// the function epilogue, or nullptr if @MBB doesn't contain an epilogue.
static const MachineInstr *getFirstEpilogueInst(const MachineBasicBlock &MBB) {
auto LastMI = MBB.getLastNonDebugInstr();
if (LastMI == MBB.end() || !LastMI->isReturn())
return nullptr;
// Assume that epilogue starts with instruction having the same debug location
// as the return instruction.
DebugLoc LastLoc = LastMI->getDebugLoc();
auto Res = LastMI;
for (MachineBasicBlock::const_reverse_iterator I = LastMI.getReverse(),
E = MBB.rend();
I != E; ++I) {
if (I->getDebugLoc() != LastLoc)
return &*Res;
Res = &*I;
}
// If all instructions have the same debug location, assume whole MBB is
// an epilogue.
return &*MBB.begin();
}
// \brief Collect registers that are modified in the function body (their
// contents is changed outside of the prologue and epilogue).
static void collectChangingRegs(const MachineFunction *MF,
const TargetRegisterInfo *TRI,
BitVector &Regs) {
for (const auto &MBB : *MF) {
auto FirstEpilogueInst = getFirstEpilogueInst(MBB);
for (const auto &MI : MBB) {
// Avoid looking at prologue or epilogue instructions.
if (&MI == FirstEpilogueInst)
break;
if (MI.getFlag(MachineInstr::FrameSetup))
continue;
// Look for register defs and register masks. Register masks are
// typically on calls and they clobber everything not in the mask.
for (const MachineOperand &MO : MI.operands()) {
// Skip virtual registers since they are handled by the parent.
if (MO.isReg() && MO.isDef() && MO.getReg() &&
!TRI->isVirtualRegister(MO.getReg())) {
for (MCRegAliasIterator AI(MO.getReg(), TRI, true); AI.isValid();
++AI)
Regs.set(*AI);
} else if (MO.isRegMask()) {
Regs.setBitsNotInMask(MO.getRegMask());
}
}
}
}
}
void llvm::calculateDbgValueHistory(const MachineFunction *MF,
const TargetRegisterInfo *TRI,
DbgValueHistoryMap &Result) {
BitVector ChangingRegs(TRI->getNumRegs());
collectChangingRegs(MF, TRI, ChangingRegs);
const TargetLowering *TLI = MF->getSubtarget().getTargetLowering();
unsigned SP = TLI->getStackPointerRegisterToSaveRestore();
RegDescribedVarsMap RegVars;
for (const auto &MBB : *MF) {
for (const auto &MI : MBB) {
if (!MI.isDebugValue()) {
// Not a DBG_VALUE instruction. It may clobber registers which describe
// some variables.
for (const MachineOperand &MO : MI.operands()) {
if (MO.isReg() && MO.isDef() && MO.getReg()) {
// Ignore call instructions that claim to clobber SP. The AArch64
// backend does this for aggregate function arguments.
if (MI.isCall() && MO.getReg() == SP)
continue;
// If this is a virtual register, only clobber it since it doesn't
// have aliases.
if (TRI->isVirtualRegister(MO.getReg()))
clobberRegisterUses(RegVars, MO.getReg(), Result, MI);
// If this is a register def operand, it may end a debug value
// range.
else {
for (MCRegAliasIterator AI(MO.getReg(), TRI, true); AI.isValid();
++AI)
if (ChangingRegs.test(*AI))
clobberRegisterUses(RegVars, *AI, Result, MI);
}
} else if (MO.isRegMask()) {
// If this is a register mask operand, clobber all debug values in
// non-CSRs.
for (unsigned I : ChangingRegs.set_bits()) {
// Don't consider SP to be clobbered by register masks.
if (unsigned(I) != SP && TRI->isPhysicalRegister(I) &&
MO.clobbersPhysReg(I)) {
clobberRegisterUses(RegVars, I, Result, MI);
}
}
}
}
continue;
}
assert(MI.getNumOperands() > 1 && "Invalid DBG_VALUE instruction!");
// Use the base variable (without any DW_OP_piece expressions)
// as index into History. The full variables including the
// piece expressions are attached to the MI.
const DILocalVariable *RawVar = MI.getDebugVariable();
assert(RawVar->isValidLocationForIntrinsic(MI.getDebugLoc()) &&
"Expected inlined-at fields to agree");
InlinedVariable Var(RawVar, MI.getDebugLoc()->getInlinedAt());
if (unsigned PrevReg = Result.getRegisterForVar(Var))
dropRegDescribedVar(RegVars, PrevReg, Var);
Result.startInstrRange(Var, MI);
if (unsigned NewReg = isDescribedByReg(MI))
addRegDescribedVar(RegVars, NewReg, Var);
}
// Make sure locations for register-described variables are valid only
// until the end of the basic block (unless it's the last basic block, in
// which case let their liveness run off to the end of the function).
if (!MBB.empty() && &MBB != &MF->back()) {
for (auto I = RegVars.begin(), E = RegVars.end(); I != E;) {
auto CurElem = I++; // CurElem can be erased below.
if (TRI->isVirtualRegister(CurElem->first) ||
ChangingRegs.test(CurElem->first))
clobberRegisterUses(RegVars, CurElem, Result, MBB.back());
}
}
}
}

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//===- llvm/CodeGen/AsmPrinter/DbgValueHistoryCalculator.h ------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_LIB_CODEGEN_ASMPRINTER_DBGVALUEHISTORYCALCULATOR_H
#define LLVM_LIB_CODEGEN_ASMPRINTER_DBGVALUEHISTORYCALCULATOR_H
#include "llvm/ADT/MapVector.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/IR/DebugInfoMetadata.h"
#include <utility>
namespace llvm {
class DILocalVariable;
class MachineFunction;
class MachineInstr;
class TargetRegisterInfo;
// For each user variable, keep a list of instruction ranges where this variable
// is accessible. The variables are listed in order of appearance.
class DbgValueHistoryMap {
// Each instruction range starts with a DBG_VALUE instruction, specifying the
// location of a variable, which is assumed to be valid until the end of the
// range. If end is not specified, location is valid until the start
// instruction of the next instruction range, or until the end of the
// function.
public:
using InstrRange = std::pair<const MachineInstr *, const MachineInstr *>;
using InstrRanges = SmallVector<InstrRange, 4>;
using InlinedVariable =
std::pair<const DILocalVariable *, const DILocation *>;
using InstrRangesMap = MapVector<InlinedVariable, InstrRanges>;
private:
InstrRangesMap VarInstrRanges;
public:
void startInstrRange(InlinedVariable Var, const MachineInstr &MI);
void endInstrRange(InlinedVariable Var, const MachineInstr &MI);
// Returns register currently describing @Var. If @Var is currently
// unaccessible or is not described by a register, returns 0.
unsigned getRegisterForVar(InlinedVariable Var) const;
bool empty() const { return VarInstrRanges.empty(); }
void clear() { VarInstrRanges.clear(); }
InstrRangesMap::const_iterator begin() const { return VarInstrRanges.begin(); }
InstrRangesMap::const_iterator end() const { return VarInstrRanges.end(); }
};
void calculateDbgValueHistory(const MachineFunction *MF,
const TargetRegisterInfo *TRI,
DbgValueHistoryMap &Result);
} // end namespace llvm
#endif // LLVM_LIB_CODEGEN_ASMPRINTER_DBGVALUEHISTORYCALCULATOR_H

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//===-- llvm/lib/CodeGen/AsmPrinter/DebugHandlerBase.cpp -------*- C++ -*--===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// Common functionality for different debug information format backends.
// LLVM currently supports DWARF and CodeView.
//
//===----------------------------------------------------------------------===//
#include "DebugHandlerBase.h"
#include "llvm/ADT/Optional.h"
#include "llvm/ADT/Twine.h"
#include "llvm/CodeGen/AsmPrinter.h"
#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/CodeGen/MachineInstr.h"
#include "llvm/CodeGen/MachineModuleInfo.h"
#include "llvm/CodeGen/TargetSubtargetInfo.h"
#include "llvm/IR/DebugInfo.h"
#include "llvm/MC/MCStreamer.h"
using namespace llvm;
Optional<DbgVariableLocation>
DbgVariableLocation::extractFromMachineInstruction(
const MachineInstr &Instruction) {
DbgVariableLocation Location;
if (!Instruction.isDebugValue())
return None;
if (!Instruction.getOperand(0).isReg())
return None;
Location.Register = Instruction.getOperand(0).getReg();
Location.FragmentInfo.reset();
// We only handle expressions generated by DIExpression::appendOffset,
// which doesn't require a full stack machine.
int64_t Offset = 0;
const DIExpression *DIExpr = Instruction.getDebugExpression();
auto Op = DIExpr->expr_op_begin();
while (Op != DIExpr->expr_op_end()) {
switch (Op->getOp()) {
case dwarf::DW_OP_constu: {
int Value = Op->getArg(0);
++Op;
if (Op != DIExpr->expr_op_end()) {
switch (Op->getOp()) {
case dwarf::DW_OP_minus:
Offset -= Value;
break;
case dwarf::DW_OP_plus:
Offset += Value;
break;
default:
continue;
}
}
} break;
case dwarf::DW_OP_plus_uconst:
Offset += Op->getArg(0);
break;
case dwarf::DW_OP_LLVM_fragment:
Location.FragmentInfo = {Op->getArg(1), Op->getArg(0)};
break;
case dwarf::DW_OP_deref:
Location.LoadChain.push_back(Offset);
Offset = 0;
break;
default:
return None;
}
++Op;
}
// Do one final implicit DW_OP_deref if this was an indirect DBG_VALUE
// instruction.
// FIXME: Replace these with DIExpression.
if (Instruction.isIndirectDebugValue())
Location.LoadChain.push_back(Offset);
return Location;
}
DebugHandlerBase::DebugHandlerBase(AsmPrinter *A) : Asm(A), MMI(Asm->MMI) {}
// Each LexicalScope has first instruction and last instruction to mark
// beginning and end of a scope respectively. Create an inverse map that list
// scopes starts (and ends) with an instruction. One instruction may start (or
// end) multiple scopes. Ignore scopes that are not reachable.
void DebugHandlerBase::identifyScopeMarkers() {
SmallVector<LexicalScope *, 4> WorkList;
WorkList.push_back(LScopes.getCurrentFunctionScope());
while (!WorkList.empty()) {
LexicalScope *S = WorkList.pop_back_val();
const SmallVectorImpl<LexicalScope *> &Children = S->getChildren();
if (!Children.empty())
WorkList.append(Children.begin(), Children.end());
if (S->isAbstractScope())
continue;
for (const InsnRange &R : S->getRanges()) {
assert(R.first && "InsnRange does not have first instruction!");
assert(R.second && "InsnRange does not have second instruction!");
requestLabelBeforeInsn(R.first);
requestLabelAfterInsn(R.second);
}
}
}
// Return Label preceding the instruction.
MCSymbol *DebugHandlerBase::getLabelBeforeInsn(const MachineInstr *MI) {
MCSymbol *Label = LabelsBeforeInsn.lookup(MI);
assert(Label && "Didn't insert label before instruction");
return Label;
}
// Return Label immediately following the instruction.
MCSymbol *DebugHandlerBase::getLabelAfterInsn(const MachineInstr *MI) {
return LabelsAfterInsn.lookup(MI);
}
int DebugHandlerBase::fragmentCmp(const DIExpression *P1,
const DIExpression *P2) {
auto Fragment1 = *P1->getFragmentInfo();
auto Fragment2 = *P2->getFragmentInfo();
unsigned l1 = Fragment1.OffsetInBits;
unsigned l2 = Fragment2.OffsetInBits;
unsigned r1 = l1 + Fragment1.SizeInBits;
unsigned r2 = l2 + Fragment2.SizeInBits;
if (r1 <= l2)
return -1;
else if (r2 <= l1)
return 1;
else
return 0;
}
bool DebugHandlerBase::fragmentsOverlap(const DIExpression *P1,
const DIExpression *P2) {
if (!P1->isFragment() || !P2->isFragment())
return true;
return fragmentCmp(P1, P2) == 0;
}
/// If this type is derived from a base type then return base type size.
uint64_t DebugHandlerBase::getBaseTypeSize(const DITypeRef TyRef) {
DIType *Ty = TyRef.resolve();
assert(Ty);
DIDerivedType *DDTy = dyn_cast<DIDerivedType>(Ty);
if (!DDTy)
return Ty->getSizeInBits();
unsigned Tag = DDTy->getTag();
if (Tag != dwarf::DW_TAG_member && Tag != dwarf::DW_TAG_typedef &&
Tag != dwarf::DW_TAG_const_type && Tag != dwarf::DW_TAG_volatile_type &&
Tag != dwarf::DW_TAG_restrict_type && Tag != dwarf::DW_TAG_atomic_type)
return DDTy->getSizeInBits();
DIType *BaseType = DDTy->getBaseType().resolve();
if (!BaseType)
return 0;
// If this is a derived type, go ahead and get the base type, unless it's a
// reference then it's just the size of the field. Pointer types have no need
// of this since they're a different type of qualification on the type.
if (BaseType->getTag() == dwarf::DW_TAG_reference_type ||
BaseType->getTag() == dwarf::DW_TAG_rvalue_reference_type)
return Ty->getSizeInBits();
return getBaseTypeSize(BaseType);
}
static bool hasDebugInfo(const MachineModuleInfo *MMI,
const MachineFunction *MF) {
if (!MMI->hasDebugInfo())
return false;
auto *SP = MF->getFunction().getSubprogram();
if (!SP)
return false;
assert(SP->getUnit());
auto EK = SP->getUnit()->getEmissionKind();
if (EK == DICompileUnit::NoDebug)
return false;
return true;
}
void DebugHandlerBase::beginFunction(const MachineFunction *MF) {
PrevInstBB = nullptr;
if (!Asm || !hasDebugInfo(MMI, MF)) {
skippedNonDebugFunction();
return;
}
// Grab the lexical scopes for the function, if we don't have any of those
// then we're not going to be able to do anything.
LScopes.initialize(*MF);
if (LScopes.empty()) {
beginFunctionImpl(MF);
return;
}
// Make sure that each lexical scope will have a begin/end label.
identifyScopeMarkers();
// Calculate history for local variables.
assert(DbgValues.empty() && "DbgValues map wasn't cleaned!");
calculateDbgValueHistory(MF, Asm->MF->getSubtarget().getRegisterInfo(),
DbgValues);
// Request labels for the full history.
for (const auto &I : DbgValues) {
const auto &Ranges = I.second;
if (Ranges.empty())
continue;
// The first mention of a function argument gets the CurrentFnBegin
// label, so arguments are visible when breaking at function entry.
const DILocalVariable *DIVar = Ranges.front().first->getDebugVariable();
if (DIVar->isParameter() &&
getDISubprogram(DIVar->getScope())->describes(&MF->getFunction())) {
LabelsBeforeInsn[Ranges.front().first] = Asm->getFunctionBegin();
if (Ranges.front().first->getDebugExpression()->isFragment()) {
// Mark all non-overlapping initial fragments.
for (auto I = Ranges.begin(); I != Ranges.end(); ++I) {
const DIExpression *Fragment = I->first->getDebugExpression();
if (std::all_of(Ranges.begin(), I,
[&](DbgValueHistoryMap::InstrRange Pred) {
return !fragmentsOverlap(
Fragment, Pred.first->getDebugExpression());
}))
LabelsBeforeInsn[I->first] = Asm->getFunctionBegin();
else
break;
}
}
}
for (const auto &Range : Ranges) {
requestLabelBeforeInsn(Range.first);
if (Range.second)
requestLabelAfterInsn(Range.second);
}
}
PrevInstLoc = DebugLoc();
PrevLabel = Asm->getFunctionBegin();
beginFunctionImpl(MF);
}
void DebugHandlerBase::beginInstruction(const MachineInstr *MI) {
if (!MMI->hasDebugInfo())
return;
assert(CurMI == nullptr);
CurMI = MI;
// Insert labels where requested.
DenseMap<const MachineInstr *, MCSymbol *>::iterator I =
LabelsBeforeInsn.find(MI);
// No label needed.
if (I == LabelsBeforeInsn.end())
return;
// Label already assigned.
if (I->second)
return;
if (!PrevLabel) {
PrevLabel = MMI->getContext().createTempSymbol();
Asm->OutStreamer->EmitLabel(PrevLabel);
}
I->second = PrevLabel;
}
void DebugHandlerBase::endInstruction() {
if (!MMI->hasDebugInfo())
return;
assert(CurMI != nullptr);
// Don't create a new label after DBG_VALUE and other instructions that don't
// generate code.
if (!CurMI->isMetaInstruction()) {
PrevLabel = nullptr;
PrevInstBB = CurMI->getParent();
}
DenseMap<const MachineInstr *, MCSymbol *>::iterator I =
LabelsAfterInsn.find(CurMI);
CurMI = nullptr;
// No label needed.
if (I == LabelsAfterInsn.end())
return;
// Label already assigned.
if (I->second)
return;
// We need a label after this instruction.
if (!PrevLabel) {
PrevLabel = MMI->getContext().createTempSymbol();
Asm->OutStreamer->EmitLabel(PrevLabel);
}
I->second = PrevLabel;
}
void DebugHandlerBase::endFunction(const MachineFunction *MF) {
if (hasDebugInfo(MMI, MF))
endFunctionImpl(MF);
DbgValues.clear();
LabelsBeforeInsn.clear();
LabelsAfterInsn.clear();
}

139
external/llvm/lib/CodeGen/AsmPrinter/DebugHandlerBase.h vendored
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@ -1,139 +0,0 @@
//===-- llvm/lib/CodeGen/AsmPrinter/DebugHandlerBase.h --------*- C++ -*--===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// Common functionality for different debug information format backends.
// LLVM currently supports DWARF and CodeView.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_LIB_CODEGEN_ASMPRINTER_DEBUGHANDLERBASE_H
#define LLVM_LIB_CODEGEN_ASMPRINTER_DEBUGHANDLERBASE_H
#include "AsmPrinterHandler.h"
#include "DbgValueHistoryCalculator.h"
#include "llvm/ADT/Optional.h"
#include "llvm/CodeGen/LexicalScopes.h"
#include "llvm/CodeGen/MachineInstr.h"
#include "llvm/IR/DebugInfoMetadata.h"
namespace llvm {
class AsmPrinter;
class MachineInstr;
class MachineModuleInfo;
/// Represents the location at which a variable is stored.
struct DbgVariableLocation {
/// Base register.
unsigned Register;
/// Chain of offsetted loads necessary to load the value if it lives in
/// memory. Every load except for the last is pointer-sized.
SmallVector<int64_t, 1> LoadChain;
/// Present if the location is part of a larger variable.
llvm::Optional<llvm::DIExpression::FragmentInfo> FragmentInfo;
/// Extract a VariableLocation from a MachineInstr.
/// This will only work if Instruction is a debug value instruction
/// and the associated DIExpression is in one of the supported forms.
/// If these requirements are not met, the returned Optional will not
/// have a value.
static Optional<DbgVariableLocation>
extractFromMachineInstruction(const MachineInstr &Instruction);
};
/// Base class for debug information backends. Common functionality related to
/// tracking which variables and scopes are alive at a given PC live here.
class DebugHandlerBase : public AsmPrinterHandler {
protected:
DebugHandlerBase(AsmPrinter *A);
/// Target of debug info emission.
AsmPrinter *Asm;
/// Collected machine module information.
MachineModuleInfo *MMI;
/// Previous instruction's location information. This is used to
/// determine label location to indicate scope boundaries in debug info.
/// We track the previous instruction's source location (if not line 0),
/// whether it was a label, and its parent BB.
DebugLoc PrevInstLoc;
MCSymbol *PrevLabel = nullptr;
const MachineBasicBlock *PrevInstBB = nullptr;
/// This location indicates end of function prologue and beginning of
/// function body.
DebugLoc PrologEndLoc;
/// If nonnull, stores the current machine instruction we're processing.
const MachineInstr *CurMI = nullptr;
LexicalScopes LScopes;
/// History of DBG_VALUE and clobber instructions for each user
/// variable. Variables are listed in order of appearance.
DbgValueHistoryMap DbgValues;
/// Maps instruction with label emitted before instruction.
/// FIXME: Make this private from DwarfDebug, we have the necessary accessors
/// for it.
DenseMap<const MachineInstr *, MCSymbol *> LabelsBeforeInsn;
/// Maps instruction with label emitted after instruction.
DenseMap<const MachineInstr *, MCSymbol *> LabelsAfterInsn;
/// Indentify instructions that are marking the beginning of or
/// ending of a scope.
void identifyScopeMarkers();
/// Ensure that a label will be emitted before MI.
void requestLabelBeforeInsn(const MachineInstr *MI) {
LabelsBeforeInsn.insert(std::make_pair(MI, nullptr));
}
/// Ensure that a label will be emitted after MI.
void requestLabelAfterInsn(const MachineInstr *MI) {
LabelsAfterInsn.insert(std::make_pair(MI, nullptr));
}
virtual void beginFunctionImpl(const MachineFunction *MF) = 0;
virtual void endFunctionImpl(const MachineFunction *MF) = 0;
virtual void skippedNonDebugFunction() {}
// AsmPrinterHandler overrides.
public:
void beginInstruction(const MachineInstr *MI) override;
void endInstruction() override;
void beginFunction(const MachineFunction *MF) override;
void endFunction(const MachineFunction *MF) override;
/// Return Label preceding the instruction.
MCSymbol *getLabelBeforeInsn(const MachineInstr *MI);
/// Return Label immediately following the instruction.
MCSymbol *getLabelAfterInsn(const MachineInstr *MI);
/// Determine the relative position of the fragments described by P1 and P2.
/// Returns -1 if P1 is entirely before P2, 0 if P1 and P2 overlap, 1 if P1 is
/// entirely after P2.
static int fragmentCmp(const DIExpression *P1, const DIExpression *P2);
/// Determine whether two variable fragments overlap.
static bool fragmentsOverlap(const DIExpression *P1, const DIExpression *P2);
/// If this type is derived from a base type then return base type size.
static uint64_t getBaseTypeSize(const DITypeRef TyRef);
};
}
#endif

186
external/llvm/lib/CodeGen/AsmPrinter/DebugLocEntry.h vendored
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@ -1,186 +0,0 @@
//===-- llvm/CodeGen/DebugLocEntry.h - Entry in debug_loc list -*- C++ -*--===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_LIB_CODEGEN_ASMPRINTER_DEBUGLOCENTRY_H
#define LLVM_LIB_CODEGEN_ASMPRINTER_DEBUGLOCENTRY_H
#include "DebugLocStream.h"
#include "llvm/IR/Constants.h"
#include "llvm/IR/DebugInfo.h"
#include "llvm/MC/MCSymbol.h"
#include "llvm/MC/MachineLocation.h"
#include "llvm/Support/Debug.h"
namespace llvm {
class AsmPrinter;
/// \brief This struct describes location entries emitted in the .debug_loc
/// section.
class DebugLocEntry {
/// Begin and end symbols for the address range that this location is valid.
const MCSymbol *Begin;
const MCSymbol *End;
public:
/// \brief A single location or constant.
struct Value {
Value(const DIExpression *Expr, int64_t i)
: Expression(Expr), EntryKind(E_Integer) {
Constant.Int = i;
}
Value(const DIExpression *Expr, const ConstantFP *CFP)
: Expression(Expr), EntryKind(E_ConstantFP) {
Constant.CFP = CFP;
}
Value(const DIExpression *Expr, const ConstantInt *CIP)
: Expression(Expr), EntryKind(E_ConstantInt) {
Constant.CIP = CIP;
}
Value(const DIExpression *Expr, MachineLocation Loc)
: Expression(Expr), EntryKind(E_Location), Loc(Loc) {
assert(cast<DIExpression>(Expr)->isValid());
}
/// Any complex address location expression for this Value.
const DIExpression *Expression;
/// Type of entry that this represents.
enum EntryType { E_Location, E_Integer, E_ConstantFP, E_ConstantInt };
enum EntryType EntryKind;
/// Either a constant,
union {
int64_t Int;
const ConstantFP *CFP;
const ConstantInt *CIP;
} Constant;
// Or a location in the machine frame.
MachineLocation Loc;
bool isLocation() const { return EntryKind == E_Location; }
bool isInt() const { return EntryKind == E_Integer; }
bool isConstantFP() const { return EntryKind == E_ConstantFP; }
bool isConstantInt() const { return EntryKind == E_ConstantInt; }
int64_t getInt() const { return Constant.Int; }
const ConstantFP *getConstantFP() const { return Constant.CFP; }
const ConstantInt *getConstantInt() const { return Constant.CIP; }
MachineLocation getLoc() const { return Loc; }
bool isFragment() const { return getExpression()->isFragment(); }
const DIExpression *getExpression() const { return Expression; }
friend bool operator==(const Value &, const Value &);
friend bool operator<(const Value &, const Value &);
#if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)
LLVM_DUMP_METHOD void dump() const {
if (isLocation()) {
llvm::dbgs() << "Loc = { reg=" << Loc.getReg() << " ";
if (Loc.isIndirect())
llvm::dbgs() << "+0";
llvm::dbgs() << "} ";
}
else if (isConstantInt())
Constant.CIP->dump();
else if (isConstantFP())
Constant.CFP->dump();
if (Expression)
Expression->dump();
}
#endif
};
private:
/// A nonempty list of locations/constants belonging to this entry,
/// sorted by offset.
SmallVector<Value, 1> Values;
public:
DebugLocEntry(const MCSymbol *B, const MCSymbol *E, Value Val)
: Begin(B), End(E) {
Values.push_back(std::move(Val));
}
/// \brief If this and Next are describing different pieces of the same
/// variable, merge them by appending Next's values to the current
/// list of values.
/// Return true if the merge was successful.
bool MergeValues(const DebugLocEntry &Next);
/// \brief Attempt to merge this DebugLocEntry with Next and return
/// true if the merge was successful. Entries can be merged if they
/// share the same Loc/Constant and if Next immediately follows this
/// Entry.
bool MergeRanges(const DebugLocEntry &Next) {
// If this and Next are describing the same variable, merge them.
if ((End == Next.Begin && Values == Next.Values)) {
End = Next.End;
return true;
}
return false;
}
const MCSymbol *getBeginSym() const { return Begin; }
const MCSymbol *getEndSym() const { return End; }
ArrayRef<Value> getValues() const { return Values; }
void addValues(ArrayRef<DebugLocEntry::Value> Vals) {
Values.append(Vals.begin(), Vals.end());
sortUniqueValues();
assert(all_of(Values, [](DebugLocEntry::Value V) {
return V.isFragment();
}) && "value must be a piece");
}
// \brief Sort the pieces by offset.
// Remove any duplicate entries by dropping all but the first.
void sortUniqueValues() {
std::sort(Values.begin(), Values.end());
Values.erase(
std::unique(
Values.begin(), Values.end(), [](const Value &A, const Value &B) {
return A.getExpression() == B.getExpression();
}),
Values.end());
}
/// \brief Lower this entry into a DWARF expression.
void finalize(const AsmPrinter &AP, DebugLocStream::ListBuilder &List,
const DIBasicType *BT);
};
/// \brief Compare two Values for equality.
inline bool operator==(const DebugLocEntry::Value &A,
const DebugLocEntry::Value &B) {
if (A.EntryKind != B.EntryKind)
return false;
if (A.Expression != B.Expression)
return false;
switch (A.EntryKind) {
case DebugLocEntry::Value::E_Location:
return A.Loc == B.Loc;
case DebugLocEntry::Value::E_Integer:
return A.Constant.Int == B.Constant.Int;
case DebugLocEntry::Value::E_ConstantFP:
return A.Constant.CFP == B.Constant.CFP;
case DebugLocEntry::Value::E_ConstantInt:
return A.Constant.CIP == B.Constant.CIP;
}
llvm_unreachable("unhandled EntryKind");
}
/// Compare two fragments based on their offset.
inline bool operator<(const DebugLocEntry::Value &A,
const DebugLocEntry::Value &B) {
return A.getExpression()->getFragmentInfo()->OffsetInBits <
B.getExpression()->getFragmentInfo()->OffsetInBits;
}
}
#endif

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