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llvm-project/llvm/lib/MC/MCAsmStreamer.cpp

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//===- lib/MC/MCAsmStreamer.cpp - Text Assembly Output ----------*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "llvm/ADT/Optional.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/ADT/SmallString.h"
#include "llvm/ADT/StringExtras.h"
#include "llvm/ADT/Twine.h"
#include "llvm/DebugInfo/CodeView/SymbolRecord.h"
#include "llvm/MC/MCAsmBackend.h"
#include "llvm/MC/MCAsmInfo.h"
#include "llvm/MC/MCAssembler.h"
#include "llvm/MC/MCCodeEmitter.h"
#include "llvm/MC/MCCodeView.h"
#include "llvm/MC/MCContext.h"
#include "llvm/MC/MCExpr.h"
#include "llvm/MC/MCFixupKindInfo.h"
#include "llvm/MC/MCInst.h"
#include "llvm/MC/MCInstPrinter.h"
#include "llvm/MC/MCObjectFileInfo.h"
#include "llvm/MC/MCObjectWriter.h"
#include "llvm/MC/MCRegister.h"
#include "llvm/MC/MCRegisterInfo.h"
#include "llvm/MC/MCSectionMachO.h"
#include "llvm/MC/MCStreamer.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/Format.h"
#include "llvm/Support/FormattedStream.h"
#include "llvm/Support/LEB128.h"
#include "llvm/Support/MathExtras.h"
#include "llvm/Support/Path.h"
#include "llvm/Support/TargetRegistry.h"
#include <cctype>
using namespace llvm;
namespace {
class MCAsmStreamer final : public MCStreamer {
std::unique_ptr<formatted_raw_ostream> OSOwner;
formatted_raw_ostream &OS;
const MCAsmInfo *MAI;
std::unique_ptr<MCInstPrinter> InstPrinter;
std::unique_ptr<MCAssembler> Assembler;
SmallString<128> ExplicitCommentToEmit;
SmallString<128> CommentToEmit;
raw_svector_ostream CommentStream;
raw_null_ostream NullStream;
unsigned IsVerboseAsm : 1;
unsigned ShowInst : 1;
unsigned UseDwarfDirectory : 1;
void EmitRegisterName(int64_t Register);
void EmitCFIStartProcImpl(MCDwarfFrameInfo &Frame) override;
void EmitCFIEndProcImpl(MCDwarfFrameInfo &Frame) override;
public:
MCAsmStreamer(MCContext &Context, std::unique_ptr<formatted_raw_ostream> os,
bool isVerboseAsm, bool useDwarfDirectory,
MCInstPrinter *printer, std::unique_ptr<MCCodeEmitter> emitter,
std::unique_ptr<MCAsmBackend> asmbackend, bool showInst)
: MCStreamer(Context), OSOwner(std::move(os)), OS(*OSOwner),
MAI(Context.getAsmInfo()), InstPrinter(printer),
Assembler(std::make_unique<MCAssembler>(
Context, std::move(asmbackend), std::move(emitter),
(asmbackend) ? asmbackend->createObjectWriter(NullStream)
: nullptr)),
CommentStream(CommentToEmit), IsVerboseAsm(isVerboseAsm),
ShowInst(showInst), UseDwarfDirectory(useDwarfDirectory) {
assert(InstPrinter);
if (IsVerboseAsm)
InstPrinter->setCommentStream(CommentStream);
if (Assembler->getBackendPtr())
setAllowAutoPadding(Assembler->getBackend().allowAutoPadding());
}
MCAssembler &getAssembler() { return *Assembler; }
MCAssembler *getAssemblerPtr() override { return nullptr; }
inline void EmitEOL() {
// Dump Explicit Comments here.
emitExplicitComments();
// If we don't have any comments, just emit a \n.
if (!IsVerboseAsm) {
OS << '\n';
return;
}
EmitCommentsAndEOL();
}
void EmitSyntaxDirective() override;
void EmitCommentsAndEOL();
/// Return true if this streamer supports verbose assembly at all.
bool isVerboseAsm() const override { return IsVerboseAsm; }
/// Do we support EmitRawText?
bool hasRawTextSupport() const override { return true; }
/// Add a comment that can be emitted to the generated .s file to make the
/// output of the compiler more readable. This only affects the MCAsmStreamer
/// and only when verbose assembly output is enabled.
void AddComment(const Twine &T, bool EOL = true) override;
/// Add a comment showing the encoding of an instruction.
void AddEncodingComment(const MCInst &Inst, const MCSubtargetInfo &);
/// Return a raw_ostream that comments can be written to.
/// Unlike AddComment, you are required to terminate comments with \n if you
/// use this method.
raw_ostream &GetCommentOS() override {
if (!IsVerboseAsm)
return nulls(); // Discard comments unless in verbose asm mode.
return CommentStream;
}
void emitRawComment(const Twine &T, bool TabPrefix = true) override;
void addExplicitComment(const Twine &T) override;
void emitExplicitComments() override;
/// Emit a blank line to a .s file to pretty it up.
void AddBlankLine() override {
EmitEOL();
}
/// @name MCStreamer Interface
/// @{
void ChangeSection(MCSection *Section, const MCExpr *Subsection) override;
void emitELFSymverDirective(StringRef AliasName,
const MCSymbol *Aliasee) override;
void EmitLOHDirective(MCLOHType Kind, const MCLOHArgs &Args) override;
void EmitLabel(MCSymbol *Symbol, SMLoc Loc = SMLoc()) override;
void EmitAssemblerFlag(MCAssemblerFlag Flag) override;
void EmitLinkerOptions(ArrayRef<std::string> Options) override;
void EmitDataRegion(MCDataRegionType Kind) override;
void EmitVersionMin(MCVersionMinType Kind, unsigned Major, unsigned Minor,
unsigned Update, VersionTuple SDKVersion) override;
void EmitBuildVersion(unsigned Platform, unsigned Major, unsigned Minor,
unsigned Update, VersionTuple SDKVersion) override;
void EmitThumbFunc(MCSymbol *Func) override;
void EmitAssignment(MCSymbol *Symbol, const MCExpr *Value) override;
void EmitWeakReference(MCSymbol *Alias, const MCSymbol *Symbol) override;
bool EmitSymbolAttribute(MCSymbol *Symbol, MCSymbolAttr Attribute) override;
void EmitSymbolDesc(MCSymbol *Symbol, unsigned DescValue) override;
void BeginCOFFSymbolDef(const MCSymbol *Symbol) override;
void EmitCOFFSymbolStorageClass(int StorageClass) override;
void EmitCOFFSymbolType(int Type) override;
void EndCOFFSymbolDef() override;
void EmitCOFFSafeSEH(MCSymbol const *Symbol) override;
void EmitCOFFSymbolIndex(MCSymbol const *Symbol) override;
void EmitCOFFSectionIndex(MCSymbol const *Symbol) override;
void EmitCOFFSecRel32(MCSymbol const *Symbol, uint64_t Offset) override;
void EmitCOFFImgRel32(MCSymbol const *Symbol, int64_t Offset) override;
void EmitXCOFFLocalCommonSymbol(MCSymbol *LabelSym, uint64_t Size,
MCSymbol *CsectSym,
unsigned ByteAlign) override;
void emitELFSize(MCSymbol *Symbol, const MCExpr *Value) override;
void EmitCommonSymbol(MCSymbol *Symbol, uint64_t Size,
unsigned ByteAlignment) override;
/// Emit a local common (.lcomm) symbol.
///
/// @param Symbol - The common symbol to emit.
/// @param Size - The size of the common symbol.
/// @param ByteAlignment - The alignment of the common symbol in bytes.
void EmitLocalCommonSymbol(MCSymbol *Symbol, uint64_t Size,
unsigned ByteAlignment) override;
void EmitZerofill(MCSection *Section, MCSymbol *Symbol = nullptr,
uint64_t Size = 0, unsigned ByteAlignment = 0,
SMLoc Loc = SMLoc()) override;
void EmitTBSSSymbol(MCSection *Section, MCSymbol *Symbol, uint64_t Size,
unsigned ByteAlignment = 0) override;
void EmitBinaryData(StringRef Data) override;
void EmitBytes(StringRef Data) override;
void EmitValueImpl(const MCExpr *Value, unsigned Size,
SMLoc Loc = SMLoc()) override;
void EmitIntValue(uint64_t Value, unsigned Size) override;
void EmitIntValueInHex(uint64_t Value, unsigned Size) override;
void EmitIntValueInHexWithPadding(uint64_t Value, unsigned Size) override;
void EmitULEB128Value(const MCExpr *Value) override;
void EmitSLEB128Value(const MCExpr *Value) override;
void EmitDTPRel32Value(const MCExpr *Value) override;
void EmitDTPRel64Value(const MCExpr *Value) override;
void EmitTPRel32Value(const MCExpr *Value) override;
void EmitTPRel64Value(const MCExpr *Value) override;
void EmitGPRel64Value(const MCExpr *Value) override;
void EmitGPRel32Value(const MCExpr *Value) override;
void emitFill(const MCExpr &NumBytes, uint64_t FillValue,
SMLoc Loc = SMLoc()) override;
void emitFill(const MCExpr &NumValues, int64_t Size, int64_t Expr,
SMLoc Loc = SMLoc()) override;
void EmitValueToAlignment(unsigned ByteAlignment, int64_t Value = 0,
unsigned ValueSize = 1,
unsigned MaxBytesToEmit = 0) override;
void EmitCodeAlignment(unsigned ByteAlignment,
unsigned MaxBytesToEmit = 0) override;
void emitValueToOffset(const MCExpr *Offset,
unsigned char Value,
SMLoc Loc) override;
void EmitFileDirective(StringRef Filename) override;
Expected<unsigned> tryEmitDwarfFileDirective(unsigned FileNo,
StringRef Directory,
StringRef Filename,
Optional<MD5::MD5Result> Checksum = None,
Optional<StringRef> Source = None,
unsigned CUID = 0) override;
void emitDwarfFile0Directive(StringRef Directory, StringRef Filename,
Optional<MD5::MD5Result> Checksum,
Optional<StringRef> Source,
unsigned CUID = 0) override;
void EmitDwarfLocDirective(unsigned FileNo, unsigned Line,
unsigned Column, unsigned Flags,
unsigned Isa, unsigned Discriminator,
StringRef FileName) override;
MCSymbol *getDwarfLineTableSymbol(unsigned CUID) override;
bool EmitCVFileDirective(unsigned FileNo, StringRef Filename,
ArrayRef<uint8_t> Checksum,
unsigned ChecksumKind) override;
bool EmitCVFuncIdDirective(unsigned FuncId) override;
bool EmitCVInlineSiteIdDirective(unsigned FunctionId, unsigned IAFunc,
unsigned IAFile, unsigned IALine,
unsigned IACol, SMLoc Loc) override;
void EmitCVLocDirective(unsigned FunctionId, unsigned FileNo, unsigned Line,
unsigned Column, bool PrologueEnd, bool IsStmt,
StringRef FileName, SMLoc Loc) override;
void EmitCVLinetableDirective(unsigned FunctionId, const MCSymbol *FnStart,
const MCSymbol *FnEnd) override;
void EmitCVInlineLinetableDirective(unsigned PrimaryFunctionId,
unsigned SourceFileId,
unsigned SourceLineNum,
const MCSymbol *FnStartSym,
const MCSymbol *FnEndSym) override;
void PrintCVDefRangePrefix(
ArrayRef<std::pair<const MCSymbol *, const MCSymbol *>> Ranges);
void EmitCVDefRangeDirective(
ArrayRef<std::pair<const MCSymbol *, const MCSymbol *>> Ranges,
codeview::DefRangeRegisterRelHeader DRHdr) override;
void EmitCVDefRangeDirective(
ArrayRef<std::pair<const MCSymbol *, const MCSymbol *>> Ranges,
codeview::DefRangeSubfieldRegisterHeader DRHdr) override;
void EmitCVDefRangeDirective(
ArrayRef<std::pair<const MCSymbol *, const MCSymbol *>> Ranges,
codeview::DefRangeRegisterHeader DRHdr) override;
void EmitCVDefRangeDirective(
ArrayRef<std::pair<const MCSymbol *, const MCSymbol *>> Ranges,
codeview::DefRangeFramePointerRelHeader DRHdr) override;
void EmitCVStringTableDirective() override;
void EmitCVFileChecksumsDirective() override;
void EmitCVFileChecksumOffsetDirective(unsigned FileNo) override;
void EmitCVFPOData(const MCSymbol *ProcSym, SMLoc L) override;
void EmitIdent(StringRef IdentString) override;
void EmitCFIBKeyFrame() override;
void EmitCFISections(bool EH, bool Debug) override;
void EmitCFIDefCfa(int64_t Register, int64_t Offset) override;
void EmitCFIDefCfaOffset(int64_t Offset) override;
void EmitCFIDefCfaRegister(int64_t Register) override;
void EmitCFIOffset(int64_t Register, int64_t Offset) override;
void EmitCFIPersonality(const MCSymbol *Sym, unsigned Encoding) override;
void EmitCFILsda(const MCSymbol *Sym, unsigned Encoding) override;
void EmitCFIRememberState() override;
void EmitCFIRestoreState() override;
void EmitCFIRestore(int64_t Register) override;
void EmitCFISameValue(int64_t Register) override;
void EmitCFIRelOffset(int64_t Register, int64_t Offset) override;
void EmitCFIAdjustCfaOffset(int64_t Adjustment) override;
void EmitCFIEscape(StringRef Values) override;
void EmitCFIGnuArgsSize(int64_t Size) override;
void EmitCFISignalFrame() override;
void EmitCFIUndefined(int64_t Register) override;
void EmitCFIRegister(int64_t Register1, int64_t Register2) override;
void EmitCFIWindowSave() override;
void EmitCFINegateRAState() override;
void EmitCFIReturnColumn(int64_t Register) override;
void EmitWinCFIStartProc(const MCSymbol *Symbol, SMLoc Loc) override;
void EmitWinCFIEndProc(SMLoc Loc) override;
void EmitWinCFIFuncletOrFuncEnd(SMLoc Loc) override;
void EmitWinCFIStartChained(SMLoc Loc) override;
void EmitWinCFIEndChained(SMLoc Loc) override;
void EmitWinCFIPushReg(MCRegister Register, SMLoc Loc) override;
void EmitWinCFISetFrame(MCRegister Register, unsigned Offset,
SMLoc Loc) override;
void EmitWinCFIAllocStack(unsigned Size, SMLoc Loc) override;
void EmitWinCFISaveReg(MCRegister Register, unsigned Offset,
SMLoc Loc) override;
void EmitWinCFISaveXMM(MCRegister Register, unsigned Offset,
SMLoc Loc) override;
void EmitWinCFIPushFrame(bool Code, SMLoc Loc) override;
void EmitWinCFIEndProlog(SMLoc Loc) override;
void EmitWinEHHandler(const MCSymbol *Sym, bool Unwind, bool Except,
SMLoc Loc) override;
void EmitWinEHHandlerData(SMLoc Loc) override;
void emitCGProfileEntry(const MCSymbolRefExpr *From,
const MCSymbolRefExpr *To, uint64_t Count) override;
void EmitInstruction(const MCInst &Inst, const MCSubtargetInfo &STI) override;
void EmitBundleAlignMode(unsigned AlignPow2) override;
void EmitBundleLock(bool AlignToEnd) override;
void EmitBundleUnlock() override;
bool EmitRelocDirective(const MCExpr &Offset, StringRef Name,
const MCExpr *Expr, SMLoc Loc,
const MCSubtargetInfo &STI) override;
void EmitAddrsig() override;
void EmitAddrsigSym(const MCSymbol *Sym) override;
/// If this file is backed by an assembly streamer, this dumps the specified
/// string in the output .s file. This capability is indicated by the
/// hasRawTextSupport() predicate.
void EmitRawTextImpl(StringRef String) override;
void FinishImpl() override;
};
} // end anonymous namespace.
void MCAsmStreamer::AddComment(const Twine &T, bool EOL) {
if (!IsVerboseAsm) return;
T.toVector(CommentToEmit);
if (EOL)
CommentToEmit.push_back('\n'); // Place comment in a new line.
}
void MCAsmStreamer::EmitCommentsAndEOL() {
if (CommentToEmit.empty() && CommentStream.GetNumBytesInBuffer() == 0) {
OS << '\n';
return;
}
StringRef Comments = CommentToEmit;
assert(Comments.back() == '\n' &&
"Comment array not newline terminated");
do {
// Emit a line of comments.
OS.PadToColumn(MAI->getCommentColumn());
size_t Position = Comments.find('\n');
OS << MAI->getCommentString() << ' ' << Comments.substr(0, Position) <<'\n';
Comments = Comments.substr(Position+1);
} while (!Comments.empty());
CommentToEmit.clear();
}
static inline int64_t truncateToSize(int64_t Value, unsigned Bytes) {
assert(Bytes > 0 && Bytes <= 8 && "Invalid size!");
return Value & ((uint64_t) (int64_t) -1 >> (64 - Bytes * 8));
}
void MCAsmStreamer::emitRawComment(const Twine &T, bool TabPrefix) {
if (TabPrefix)
OS << '\t';
OS << MAI->getCommentString() << T;
EmitEOL();
}
void MCAsmStreamer::addExplicitComment(const Twine &T) {
StringRef c = T.getSingleStringRef();
if (c.equals(StringRef(MAI->getSeparatorString())))
return;
if (c.startswith(StringRef("//"))) {
ExplicitCommentToEmit.append("\t");
ExplicitCommentToEmit.append(MAI->getCommentString());
// drop //
ExplicitCommentToEmit.append(c.slice(2, c.size()).str());
} else if (c.startswith(StringRef("/*"))) {
size_t p = 2, len = c.size() - 2;
// emit each line in comment as separate newline.
do {
size_t newp = std::min(len, c.find_first_of("\r\n", p));
ExplicitCommentToEmit.append("\t");
ExplicitCommentToEmit.append(MAI->getCommentString());
ExplicitCommentToEmit.append(c.slice(p, newp).str());
// If we have another line in this comment add line
if (newp < len)
ExplicitCommentToEmit.append("\n");
p = newp + 1;
} while (p < len);
} else if (c.startswith(StringRef(MAI->getCommentString()))) {
ExplicitCommentToEmit.append("\t");
ExplicitCommentToEmit.append(c.str());
} else if (c.front() == '#') {
ExplicitCommentToEmit.append("\t");
ExplicitCommentToEmit.append(MAI->getCommentString());
ExplicitCommentToEmit.append(c.slice(1, c.size()).str());
} else
assert(false && "Unexpected Assembly Comment");
// full line comments immediately output
if (c.back() == '\n')
emitExplicitComments();
}
void MCAsmStreamer::emitExplicitComments() {
StringRef Comments = ExplicitCommentToEmit;
if (!Comments.empty())
OS << Comments;
ExplicitCommentToEmit.clear();
}
void MCAsmStreamer::ChangeSection(MCSection *Section,
const MCExpr *Subsection) {
assert(Section && "Cannot switch to a null section!");
if (MCTargetStreamer *TS = getTargetStreamer()) {
TS->changeSection(getCurrentSectionOnly(), Section, Subsection, OS);
} else {
Section->PrintSwitchToSection(
*MAI, getContext().getObjectFileInfo()->getTargetTriple(), OS,
Subsection);
}
}
void MCAsmStreamer::emitELFSymverDirective(StringRef AliasName,
const MCSymbol *Aliasee) {
OS << ".symver ";
Aliasee->print(OS, MAI);
OS << ", " << AliasName;
EmitEOL();
}
void MCAsmStreamer::EmitLabel(MCSymbol *Symbol, SMLoc Loc) {
MCStreamer::EmitLabel(Symbol, Loc);
Symbol->print(OS, MAI);
OS << MAI->getLabelSuffix();
EmitEOL();
}
void MCAsmStreamer::EmitLOHDirective(MCLOHType Kind, const MCLOHArgs &Args) {
StringRef str = MCLOHIdToName(Kind);
#ifndef NDEBUG
int NbArgs = MCLOHIdToNbArgs(Kind);
assert(NbArgs != -1 && ((size_t)NbArgs) == Args.size() && "Malformed LOH!");
assert(str != "" && "Invalid LOH name");
#endif
OS << "\t" << MCLOHDirectiveName() << " " << str << "\t";
bool IsFirst = true;
for (const MCSymbol *Arg : Args) {
if (!IsFirst)
OS << ", ";
IsFirst = false;
Arg->print(OS, MAI);
}
EmitEOL();
}
void MCAsmStreamer::EmitAssemblerFlag(MCAssemblerFlag Flag) {
switch (Flag) {
case MCAF_SyntaxUnified: OS << "\t.syntax unified"; break;
case MCAF_SubsectionsViaSymbols: OS << ".subsections_via_symbols"; break;
case MCAF_Code16: OS << '\t'<< MAI->getCode16Directive();break;
case MCAF_Code32: OS << '\t'<< MAI->getCode32Directive();break;
case MCAF_Code64: OS << '\t'<< MAI->getCode64Directive();break;
}
EmitEOL();
}
void MCAsmStreamer::EmitLinkerOptions(ArrayRef<std::string> Options) {
assert(!Options.empty() && "At least one option is required!");
OS << "\t.linker_option \"" << Options[0] << '"';
for (ArrayRef<std::string>::iterator it = Options.begin() + 1,
ie = Options.end(); it != ie; ++it) {
OS << ", " << '"' << *it << '"';
}
EmitEOL();
}
void MCAsmStreamer::EmitDataRegion(MCDataRegionType Kind) {
if (!MAI->doesSupportDataRegionDirectives())
return;
switch (Kind) {
case MCDR_DataRegion: OS << "\t.data_region"; break;
case MCDR_DataRegionJT8: OS << "\t.data_region jt8"; break;
case MCDR_DataRegionJT16: OS << "\t.data_region jt16"; break;
case MCDR_DataRegionJT32: OS << "\t.data_region jt32"; break;
case MCDR_DataRegionEnd: OS << "\t.end_data_region"; break;
}
EmitEOL();
}
static const char *getVersionMinDirective(MCVersionMinType Type) {
switch (Type) {
case MCVM_WatchOSVersionMin: return ".watchos_version_min";
case MCVM_TvOSVersionMin: return ".tvos_version_min";
case MCVM_IOSVersionMin: return ".ios_version_min";
case MCVM_OSXVersionMin: return ".macosx_version_min";
}
llvm_unreachable("Invalid MC version min type");
}
static void EmitSDKVersionSuffix(raw_ostream &OS,
const VersionTuple &SDKVersion) {
if (SDKVersion.empty())
return;
OS << '\t' << "sdk_version " << SDKVersion.getMajor();
if (auto Minor = SDKVersion.getMinor()) {
OS << ", " << *Minor;
if (auto Subminor = SDKVersion.getSubminor()) {
OS << ", " << *Subminor;
}
}
}
void MCAsmStreamer::EmitVersionMin(MCVersionMinType Type, unsigned Major,
unsigned Minor, unsigned Update,
VersionTuple SDKVersion) {
OS << '\t' << getVersionMinDirective(Type) << ' ' << Major << ", " << Minor;
if (Update)
OS << ", " << Update;
EmitSDKVersionSuffix(OS, SDKVersion);
EmitEOL();
}
static const char *getPlatformName(MachO::PlatformType Type) {
switch (Type) {
case MachO::PLATFORM_MACOS: return "macos";
case MachO::PLATFORM_IOS: return "ios";
case MachO::PLATFORM_TVOS: return "tvos";
case MachO::PLATFORM_WATCHOS: return "watchos";
case MachO::PLATFORM_BRIDGEOS: return "bridgeos";
case MachO::PLATFORM_MACCATALYST: return "macCatalyst";
case MachO::PLATFORM_IOSSIMULATOR: return "iossimulator";
case MachO::PLATFORM_TVOSSIMULATOR: return "tvossimulator";
case MachO::PLATFORM_WATCHOSSIMULATOR: return "watchossimulator";
}
llvm_unreachable("Invalid Mach-O platform type");
}
void MCAsmStreamer::EmitBuildVersion(unsigned Platform, unsigned Major,
unsigned Minor, unsigned Update,
VersionTuple SDKVersion) {
const char *PlatformName = getPlatformName((MachO::PlatformType)Platform);
OS << "\t.build_version " << PlatformName << ", " << Major << ", " << Minor;
if (Update)
OS << ", " << Update;
EmitSDKVersionSuffix(OS, SDKVersion);
EmitEOL();
}
void MCAsmStreamer::EmitThumbFunc(MCSymbol *Func) {
// This needs to emit to a temporary string to get properly quoted
// MCSymbols when they have spaces in them.
OS << "\t.thumb_func";
// Only Mach-O hasSubsectionsViaSymbols()
if (MAI->hasSubsectionsViaSymbols()) {
OS << '\t';
Func->print(OS, MAI);
}
EmitEOL();
}
void MCAsmStreamer::EmitAssignment(MCSymbol *Symbol, const MCExpr *Value) {
// Do not emit a .set on inlined target assignments.
bool EmitSet = true;
if (auto *E = dyn_cast<MCTargetExpr>(Value))
if (E->inlineAssignedExpr())
EmitSet = false;
if (EmitSet) {
OS << ".set ";
Symbol->print(OS, MAI);
OS << ", ";
Value->print(OS, MAI);
EmitEOL();
}
MCStreamer::EmitAssignment(Symbol, Value);
}
void MCAsmStreamer::EmitWeakReference(MCSymbol *Alias, const MCSymbol *Symbol) {
OS << ".weakref ";
Alias->print(OS, MAI);
OS << ", ";
Symbol->print(OS, MAI);
EmitEOL();
}
bool MCAsmStreamer::EmitSymbolAttribute(MCSymbol *Symbol,
MCSymbolAttr Attribute) {
switch (Attribute) {
case MCSA_Invalid: llvm_unreachable("Invalid symbol attribute");
case MCSA_ELF_TypeFunction: /// .type _foo, STT_FUNC # aka @function
case MCSA_ELF_TypeIndFunction: /// .type _foo, STT_GNU_IFUNC
case MCSA_ELF_TypeObject: /// .type _foo, STT_OBJECT # aka @object
case MCSA_ELF_TypeTLS: /// .type _foo, STT_TLS # aka @tls_object
case MCSA_ELF_TypeCommon: /// .type _foo, STT_COMMON # aka @common
case MCSA_ELF_TypeNoType: /// .type _foo, STT_NOTYPE # aka @notype
case MCSA_ELF_TypeGnuUniqueObject: /// .type _foo, @gnu_unique_object
if (!MAI->hasDotTypeDotSizeDirective())
return false; // Symbol attribute not supported
OS << "\t.type\t";
Symbol->print(OS, MAI);
OS << ',' << ((MAI->getCommentString()[0] != '@') ? '@' : '%');
switch (Attribute) {
default: return false;
case MCSA_ELF_TypeFunction: OS << "function"; break;
case MCSA_ELF_TypeIndFunction: OS << "gnu_indirect_function"; break;
case MCSA_ELF_TypeObject: OS << "object"; break;
case MCSA_ELF_TypeTLS: OS << "tls_object"; break;
case MCSA_ELF_TypeCommon: OS << "common"; break;
case MCSA_ELF_TypeNoType: OS << "notype"; break;
case MCSA_ELF_TypeGnuUniqueObject: OS << "gnu_unique_object"; break;
}
EmitEOL();
return true;
case MCSA_Global: // .globl/.global
OS << MAI->getGlobalDirective();
break;
case MCSA_LGlobal: OS << "\t.lglobl\t"; break;
case MCSA_Hidden: OS << "\t.hidden\t"; break;
case MCSA_IndirectSymbol: OS << "\t.indirect_symbol\t"; break;
case MCSA_Internal: OS << "\t.internal\t"; break;
case MCSA_LazyReference: OS << "\t.lazy_reference\t"; break;
case MCSA_Local: OS << "\t.local\t"; break;
case MCSA_NoDeadStrip:
if (!MAI->hasNoDeadStrip())
return false;
OS << "\t.no_dead_strip\t";
break;
case MCSA_SymbolResolver: OS << "\t.symbol_resolver\t"; break;
case MCSA_AltEntry: OS << "\t.alt_entry\t"; break;
case MCSA_PrivateExtern:
OS << "\t.private_extern\t";
break;
case MCSA_Protected: OS << "\t.protected\t"; break;
case MCSA_Reference: OS << "\t.reference\t"; break;
case MCSA_Weak: OS << MAI->getWeakDirective(); break;
case MCSA_WeakDefinition:
OS << "\t.weak_definition\t";
break;
// .weak_reference
case MCSA_WeakReference: OS << MAI->getWeakRefDirective(); break;
case MCSA_WeakDefAutoPrivate: OS << "\t.weak_def_can_be_hidden\t"; break;
case MCSA_Cold:
// Assemblers currently do not support a .cold directive.
return false;
}
Symbol->print(OS, MAI);
EmitEOL();
return true;
}
void MCAsmStreamer::EmitSymbolDesc(MCSymbol *Symbol, unsigned DescValue) {
OS << ".desc" << ' ';
Symbol->print(OS, MAI);
OS << ',' << DescValue;
EmitEOL();
}
void MCAsmStreamer::EmitSyntaxDirective() {
if (MAI->getAssemblerDialect() == 1) {
OS << "\t.intel_syntax noprefix";
EmitEOL();
}
// FIXME: Currently emit unprefix'ed registers.
// The intel_syntax directive has one optional argument
// with may have a value of prefix or noprefix.
}
void MCAsmStreamer::BeginCOFFSymbolDef(const MCSymbol *Symbol) {
OS << "\t.def\t ";
Symbol->print(OS, MAI);
OS << ';';
EmitEOL();
}
void MCAsmStreamer::EmitCOFFSymbolStorageClass (int StorageClass) {
OS << "\t.scl\t" << StorageClass << ';';
EmitEOL();
}
void MCAsmStreamer::EmitCOFFSymbolType (int Type) {
OS << "\t.type\t" << Type << ';';
EmitEOL();
}
void MCAsmStreamer::EndCOFFSymbolDef() {
OS << "\t.endef";
EmitEOL();
}
void MCAsmStreamer::EmitCOFFSafeSEH(MCSymbol const *Symbol) {
OS << "\t.safeseh\t";
Symbol->print(OS, MAI);
EmitEOL();
}
void MCAsmStreamer::EmitCOFFSymbolIndex(MCSymbol const *Symbol) {
OS << "\t.symidx\t";
Symbol->print(OS, MAI);
EmitEOL();
}
void MCAsmStreamer::EmitCOFFSectionIndex(MCSymbol const *Symbol) {
OS << "\t.secidx\t";
Symbol->print(OS, MAI);
EmitEOL();
}
void MCAsmStreamer::EmitCOFFSecRel32(MCSymbol const *Symbol, uint64_t Offset) {
OS << "\t.secrel32\t";
Symbol->print(OS, MAI);
if (Offset != 0)
OS << '+' << Offset;
EmitEOL();
}
void MCAsmStreamer::EmitCOFFImgRel32(MCSymbol const *Symbol, int64_t Offset) {
OS << "\t.rva\t";
Symbol->print(OS, MAI);
if (Offset > 0)
OS << '+' << Offset;
else if (Offset < 0)
OS << '-' << -Offset;
EmitEOL();
}
// We need an XCOFF-specific version of this directive as the AIX syntax
// requires a QualName argument identifying the csect name and storage mapping
// class to appear before the alignment if we are specifying it.
void MCAsmStreamer::EmitXCOFFLocalCommonSymbol(MCSymbol *LabelSym,
uint64_t Size,
MCSymbol *CsectSym,
unsigned ByteAlignment) {
assert(MAI->getLCOMMDirectiveAlignmentType() == LCOMM::Log2Alignment &&
"We only support writing log base-2 alignment format with XCOFF.");
assert(isPowerOf2_32(ByteAlignment) && "Alignment must be a power of 2.");
OS << "\t.lcomm\t";
LabelSym->print(OS, MAI);
OS << ',' << Size << ',';
CsectSym->print(OS, MAI);
OS << ',' << Log2_32(ByteAlignment);
EmitEOL();
}
void MCAsmStreamer::emitELFSize(MCSymbol *Symbol, const MCExpr *Value) {
assert(MAI->hasDotTypeDotSizeDirective());
OS << "\t.size\t";
Symbol->print(OS, MAI);
OS << ", ";
Value->print(OS, MAI);
EmitEOL();
}
void MCAsmStreamer::EmitCommonSymbol(MCSymbol *Symbol, uint64_t Size,
unsigned ByteAlignment) {
OS << "\t.comm\t";
Symbol->print(OS, MAI);
OS << ',' << Size;
if (ByteAlignment != 0) {
if (MAI->getCOMMDirectiveAlignmentIsInBytes())
OS << ',' << ByteAlignment;
else
OS << ',' << Log2_32(ByteAlignment);
}
EmitEOL();
}
void MCAsmStreamer::EmitLocalCommonSymbol(MCSymbol *Symbol, uint64_t Size,
unsigned ByteAlign) {
OS << "\t.lcomm\t";
Symbol->print(OS, MAI);
OS << ',' << Size;
if (ByteAlign > 1) {
switch (MAI->getLCOMMDirectiveAlignmentType()) {
case LCOMM::NoAlignment:
llvm_unreachable("alignment not supported on .lcomm!");
case LCOMM::ByteAlignment:
OS << ',' << ByteAlign;
break;
case LCOMM::Log2Alignment:
assert(isPowerOf2_32(ByteAlign) && "alignment must be a power of 2");
OS << ',' << Log2_32(ByteAlign);
break;
}
}
EmitEOL();
}
void MCAsmStreamer::EmitZerofill(MCSection *Section, MCSymbol *Symbol,
uint64_t Size, unsigned ByteAlignment,
SMLoc Loc) {
if (Symbol)
AssignFragment(Symbol, &Section->getDummyFragment());
// Note: a .zerofill directive does not switch sections.
OS << ".zerofill ";
assert(Section->getVariant() == MCSection::SV_MachO &&
".zerofill is a Mach-O specific directive");
// This is a mach-o specific directive.
const MCSectionMachO *MOSection = ((const MCSectionMachO*)Section);
OS << MOSection->getSegmentName() << "," << MOSection->getSectionName();
if (Symbol) {
OS << ',';
Symbol->print(OS, MAI);
OS << ',' << Size;
if (ByteAlignment != 0)
OS << ',' << Log2_32(ByteAlignment);
}
EmitEOL();
}
// .tbss sym, size, align
// This depends that the symbol has already been mangled from the original,
// e.g. _a.
void MCAsmStreamer::EmitTBSSSymbol(MCSection *Section, MCSymbol *Symbol,
uint64_t Size, unsigned ByteAlignment) {
AssignFragment(Symbol, &Section->getDummyFragment());
assert(Symbol && "Symbol shouldn't be NULL!");
// Instead of using the Section we'll just use the shortcut.
assert(Section->getVariant() == MCSection::SV_MachO &&
".zerofill is a Mach-O specific directive");
// This is a mach-o specific directive and section.
OS << ".tbss ";
Symbol->print(OS, MAI);
OS << ", " << Size;
// Output align if we have it. We default to 1 so don't bother printing
// that.
if (ByteAlignment > 1) OS << ", " << Log2_32(ByteAlignment);
EmitEOL();
}
static inline char toOctal(int X) { return (X&7)+'0'; }
static void PrintQuotedString(StringRef Data, raw_ostream &OS) {
OS << '"';
for (unsigned i = 0, e = Data.size(); i != e; ++i) {
unsigned char C = Data[i];
if (C == '"' || C == '\\') {
OS << '\\' << (char)C;
continue;
}
if (isPrint((unsigned char)C)) {
OS << (char)C;
continue;
}
switch (C) {
case '\b': OS << "\\b"; break;
case '\f': OS << "\\f"; break;
case '\n': OS << "\\n"; break;
case '\r': OS << "\\r"; break;
case '\t': OS << "\\t"; break;
default:
OS << '\\';
OS << toOctal(C >> 6);
OS << toOctal(C >> 3);
OS << toOctal(C >> 0);
break;
}
}
OS << '"';
}
void MCAsmStreamer::EmitBytes(StringRef Data) {
assert(getCurrentSectionOnly() &&
"Cannot emit contents before setting section!");
if (Data.empty()) return;
// If only single byte is provided or no ascii or asciz directives is
// supported, emit as vector of 8bits data.
if (Data.size() == 1 ||
!(MAI->getAscizDirective() || MAI->getAsciiDirective())) {
if (MCTargetStreamer *TS = getTargetStreamer()) {
TS->emitRawBytes(Data);
} else {
const char *Directive = MAI->getData8bitsDirective();
for (const unsigned char C : Data.bytes()) {
OS << Directive << (unsigned)C;
EmitEOL();
}
}
return;
}
// If the data ends with 0 and the target supports .asciz, use it, otherwise
// use .ascii
if (MAI->getAscizDirective() && Data.back() == 0) {
OS << MAI->getAscizDirective();
Data = Data.substr(0, Data.size()-1);
} else {
OS << MAI->getAsciiDirective();
}
PrintQuotedString(Data, OS);
EmitEOL();
}
void MCAsmStreamer::EmitBinaryData(StringRef Data) {
// This is binary data. Print it in a grid of hex bytes for readability.
const size_t Cols = 4;
for (size_t I = 0, EI = alignTo(Data.size(), Cols); I < EI; I += Cols) {
size_t J = I, EJ = std::min(I + Cols, Data.size());
assert(EJ > 0);
OS << MAI->getData8bitsDirective();
for (; J < EJ - 1; ++J)
OS << format("0x%02x", uint8_t(Data[J])) << ", ";
OS << format("0x%02x", uint8_t(Data[J]));
EmitEOL();
}
}
void MCAsmStreamer::EmitIntValue(uint64_t Value, unsigned Size) {
EmitValue(MCConstantExpr::create(Value, getContext()), Size);
}
void MCAsmStreamer::EmitIntValueInHex(uint64_t Value, unsigned Size) {
EmitValue(MCConstantExpr::create(Value, getContext(), true), Size);
}
void MCAsmStreamer::EmitIntValueInHexWithPadding(uint64_t Value,
unsigned Size) {
EmitValue(MCConstantExpr::create(Value, getContext(), true, Size), Size);
}
void MCAsmStreamer::EmitValueImpl(const MCExpr *Value, unsigned Size,
SMLoc Loc) {
assert(Size <= 8 && "Invalid size");
assert(getCurrentSectionOnly() &&
"Cannot emit contents before setting section!");
const char *Directive = nullptr;
switch (Size) {
default: break;
case 1: Directive = MAI->getData8bitsDirective(); break;
case 2: Directive = MAI->getData16bitsDirective(); break;
case 4: Directive = MAI->getData32bitsDirective(); break;
case 8: Directive = MAI->getData64bitsDirective(); break;
}
if (!Directive) {
int64_t IntValue;
if (!Value->evaluateAsAbsolute(IntValue))
report_fatal_error("Don't know how to emit this value.");
// We couldn't handle the requested integer size so we fallback by breaking
// the request down into several, smaller, integers.
// Since sizes greater or equal to "Size" are invalid, we use the greatest
// power of 2 that is less than "Size" as our largest piece of granularity.
bool IsLittleEndian = MAI->isLittleEndian();
for (unsigned Emitted = 0; Emitted != Size;) {
unsigned Remaining = Size - Emitted;
// The size of our partial emission must be a power of two less than
// Size.
unsigned EmissionSize = PowerOf2Floor(std::min(Remaining, Size - 1));
// Calculate the byte offset of our partial emission taking into account
// the endianness of the target.
unsigned ByteOffset =
IsLittleEndian ? Emitted : (Remaining - EmissionSize);
uint64_t ValueToEmit = IntValue >> (ByteOffset * 8);
// We truncate our partial emission to fit within the bounds of the
// emission domain. This produces nicer output and silences potential
// truncation warnings when round tripping through another assembler.
uint64_t Shift = 64 - EmissionSize * 8;
assert(Shift < static_cast<uint64_t>(
std::numeric_limits<unsigned long long>::digits) &&
"undefined behavior");
ValueToEmit &= ~0ULL >> Shift;
EmitIntValue(ValueToEmit, EmissionSize);
Emitted += EmissionSize;
}
return;
}
assert(Directive && "Invalid size for machine code value!");
OS << Directive;
if (MCTargetStreamer *TS = getTargetStreamer()) {
TS->emitValue(Value);
} else {
Value->print(OS, MAI);
EmitEOL();
}
}
void MCAsmStreamer::EmitULEB128Value(const MCExpr *Value) {
int64_t IntValue;
if (Value->evaluateAsAbsolute(IntValue)) {
EmitULEB128IntValue(IntValue);
return;
}
OS << "\t.uleb128 ";
Value->print(OS, MAI);
EmitEOL();
}
void MCAsmStreamer::EmitSLEB128Value(const MCExpr *Value) {
int64_t IntValue;
if (Value->evaluateAsAbsolute(IntValue)) {
EmitSLEB128IntValue(IntValue);
return;
}
OS << "\t.sleb128 ";
Value->print(OS, MAI);
EmitEOL();
}
void MCAsmStreamer::EmitDTPRel64Value(const MCExpr *Value) {
assert(MAI->getDTPRel64Directive() != nullptr);
OS << MAI->getDTPRel64Directive();
Value->print(OS, MAI);
EmitEOL();
}
void MCAsmStreamer::EmitDTPRel32Value(const MCExpr *Value) {
assert(MAI->getDTPRel32Directive() != nullptr);
OS << MAI->getDTPRel32Directive();
Value->print(OS, MAI);
EmitEOL();
}
void MCAsmStreamer::EmitTPRel64Value(const MCExpr *Value) {
assert(MAI->getTPRel64Directive() != nullptr);
OS << MAI->getTPRel64Directive();
Value->print(OS, MAI);
EmitEOL();
}
void MCAsmStreamer::EmitTPRel32Value(const MCExpr *Value) {
assert(MAI->getTPRel32Directive() != nullptr);
OS << MAI->getTPRel32Directive();
Value->print(OS, MAI);
EmitEOL();
}
void MCAsmStreamer::EmitGPRel64Value(const MCExpr *Value) {
assert(MAI->getGPRel64Directive() != nullptr);
OS << MAI->getGPRel64Directive();
Value->print(OS, MAI);
EmitEOL();
}
void MCAsmStreamer::EmitGPRel32Value(const MCExpr *Value) {
assert(MAI->getGPRel32Directive() != nullptr);
OS << MAI->getGPRel32Directive();
Value->print(OS, MAI);
EmitEOL();
}
void MCAsmStreamer::emitFill(const MCExpr &NumBytes, uint64_t FillValue,
SMLoc Loc) {
int64_t IntNumBytes;
const bool IsAbsolute = NumBytes.evaluateAsAbsolute(IntNumBytes);
if (IsAbsolute && IntNumBytes == 0)
return;
if (const char *ZeroDirective = MAI->getZeroDirective()) {
if (MAI->doesZeroDirectiveSupportNonZeroValue() || FillValue == 0) {
// FIXME: Emit location directives
OS << ZeroDirective;
NumBytes.print(OS, MAI);
if (FillValue != 0)
OS << ',' << (int)FillValue;
EmitEOL();
} else {
if (!IsAbsolute)
report_fatal_error(
"Cannot emit non-absolute expression lengths of fill.");
for (int i = 0; i < IntNumBytes; ++i) {
OS << MAI->getData8bitsDirective() << (int)FillValue;
EmitEOL();
}
}
return;
}
MCStreamer::emitFill(NumBytes, FillValue);
}
void MCAsmStreamer::emitFill(const MCExpr &NumValues, int64_t Size,
int64_t Expr, SMLoc Loc) {
// FIXME: Emit location directives
OS << "\t.fill\t";
NumValues.print(OS, MAI);
OS << ", " << Size << ", 0x";
OS.write_hex(truncateToSize(Expr, 4));
EmitEOL();
}
void MCAsmStreamer::EmitValueToAlignment(unsigned ByteAlignment, int64_t Value,
unsigned ValueSize,
unsigned MaxBytesToEmit) {
if (MAI->useDotAlignForAlignment()) {
if (!isPowerOf2_32(ByteAlignment))
report_fatal_error("Only power-of-two alignments are supported "
"with .align.");
OS << "\t.align\t";
OS << Log2_32(ByteAlignment);
EmitEOL();
return;
}
// Some assemblers don't support non-power of two alignments, so we always
// emit alignments as a power of two if possible.
if (isPowerOf2_32(ByteAlignment)) {
switch (ValueSize) {
default:
llvm_unreachable("Invalid size for machine code value!");
case 1:
OS << "\t.p2align\t";
break;
case 2:
OS << ".p2alignw ";
break;
case 4:
OS << ".p2alignl ";
break;
case 8:
llvm_unreachable("Unsupported alignment size!");
}
OS << Log2_32(ByteAlignment);
if (Value || MaxBytesToEmit) {
OS << ", 0x";
OS.write_hex(truncateToSize(Value, ValueSize));
if (MaxBytesToEmit)
OS << ", " << MaxBytesToEmit;
}
EmitEOL();
return;
}
// Non-power of two alignment. This is not widely supported by assemblers.
// FIXME: Parameterize this based on MAI.
switch (ValueSize) {
default: llvm_unreachable("Invalid size for machine code value!");
case 1: OS << ".balign"; break;
case 2: OS << ".balignw"; break;
case 4: OS << ".balignl"; break;
case 8: llvm_unreachable("Unsupported alignment size!");
}
OS << ' ' << ByteAlignment;
OS << ", " << truncateToSize(Value, ValueSize);
if (MaxBytesToEmit)
OS << ", " << MaxBytesToEmit;
EmitEOL();
}
void MCAsmStreamer::EmitCodeAlignment(unsigned ByteAlignment,
unsigned MaxBytesToEmit) {
// Emit with a text fill value.
EmitValueToAlignment(ByteAlignment, MAI->getTextAlignFillValue(),
1, MaxBytesToEmit);
}
void MCAsmStreamer::emitValueToOffset(const MCExpr *Offset,
unsigned char Value,
SMLoc Loc) {
// FIXME: Verify that Offset is associated with the current section.
OS << ".org ";
Offset->print(OS, MAI);
OS << ", " << (unsigned)Value;
EmitEOL();
}
void MCAsmStreamer::EmitFileDirective(StringRef Filename) {
assert(MAI->hasSingleParameterDotFile());
OS << "\t.file\t";
PrintQuotedString(Filename, OS);
EmitEOL();
}
static void printDwarfFileDirective(unsigned FileNo, StringRef Directory,
StringRef Filename,
Optional<MD5::MD5Result> Checksum,
Optional<StringRef> Source,
bool UseDwarfDirectory,
raw_svector_ostream &OS) {
SmallString<128> FullPathName;
if (!UseDwarfDirectory && !Directory.empty()) {
if (sys::path::is_absolute(Filename))
Directory = "";
else {
FullPathName = Directory;
sys::path::append(FullPathName, Filename);
Directory = "";
Filename = FullPathName;
}
}
OS << "\t.file\t" << FileNo << ' ';
if (!Directory.empty()) {
PrintQuotedString(Directory, OS);
OS << ' ';
}
PrintQuotedString(Filename, OS);
if (Checksum)
OS << " md5 0x" << Checksum->digest();
if (Source) {
OS << " source ";
PrintQuotedString(*Source, OS);
}
}
Expected<unsigned> MCAsmStreamer::tryEmitDwarfFileDirective(
unsigned FileNo, StringRef Directory, StringRef Filename,
Optional<MD5::MD5Result> Checksum, Optional<StringRef> Source, unsigned CUID) {
assert(CUID == 0 && "multiple CUs not supported by MCAsmStreamer");
MCDwarfLineTable &Table = getContext().getMCDwarfLineTable(CUID);
unsigned NumFiles = Table.getMCDwarfFiles().size();
Expected<unsigned> FileNoOrErr =
Table.tryGetFile(Directory, Filename, Checksum, Source,
getContext().getDwarfVersion(), FileNo);
if (!FileNoOrErr)
return FileNoOrErr.takeError();
FileNo = FileNoOrErr.get();
if (NumFiles == Table.getMCDwarfFiles().size())
return FileNo;
SmallString<128> Str;
raw_svector_ostream OS1(Str);
printDwarfFileDirective(FileNo, Directory, Filename, Checksum, Source,
UseDwarfDirectory, OS1);
if (MCTargetStreamer *TS = getTargetStreamer())
TS->emitDwarfFileDirective(OS1.str());
else
EmitRawText(OS1.str());
return FileNo;
}
void MCAsmStreamer::emitDwarfFile0Directive(StringRef Directory,
StringRef Filename,
Optional<MD5::MD5Result> Checksum,
Optional<StringRef> Source,
unsigned CUID) {
assert(CUID == 0);
// .file 0 is new for DWARF v5.
if (getContext().getDwarfVersion() < 5)
return;
// Inform MCDwarf about the root file.
getContext().setMCLineTableRootFile(CUID, Directory, Filename, Checksum,
Source);
SmallString<128> Str;
raw_svector_ostream OS1(Str);
printDwarfFileDirective(0, Directory, Filename, Checksum, Source,
UseDwarfDirectory, OS1);
if (MCTargetStreamer *TS = getTargetStreamer())
TS->emitDwarfFileDirective(OS1.str());
else
EmitRawText(OS1.str());
}
void MCAsmStreamer::EmitDwarfLocDirective(unsigned FileNo, unsigned Line,
unsigned Column, unsigned Flags,
unsigned Isa,
unsigned Discriminator,
StringRef FileName) {
OS << "\t.loc\t" << FileNo << " " << Line << " " << Column;
if (MAI->supportsExtendedDwarfLocDirective()) {
if (Flags & DWARF2_FLAG_BASIC_BLOCK)
OS << " basic_block";
if (Flags & DWARF2_FLAG_PROLOGUE_END)
OS << " prologue_end";
if (Flags & DWARF2_FLAG_EPILOGUE_BEGIN)
OS << " epilogue_begin";
unsigned OldFlags = getContext().getCurrentDwarfLoc().getFlags();
if ((Flags & DWARF2_FLAG_IS_STMT) != (OldFlags & DWARF2_FLAG_IS_STMT)) {
OS << " is_stmt ";
if (Flags & DWARF2_FLAG_IS_STMT)
OS << "1";
else
OS << "0";
}
if (Isa)
OS << " isa " << Isa;
if (Discriminator)
OS << " discriminator " << Discriminator;
}
if (IsVerboseAsm) {
OS.PadToColumn(MAI->getCommentColumn());
OS << MAI->getCommentString() << ' ' << FileName << ':'
<< Line << ':' << Column;
}
EmitEOL();
this->MCStreamer::EmitDwarfLocDirective(FileNo, Line, Column, Flags,
Isa, Discriminator, FileName);
}
MCSymbol *MCAsmStreamer::getDwarfLineTableSymbol(unsigned CUID) {
// Always use the zeroth line table, since asm syntax only supports one line
// table for now.
return MCStreamer::getDwarfLineTableSymbol(0);
}
bool MCAsmStreamer::EmitCVFileDirective(unsigned FileNo, StringRef Filename,
ArrayRef<uint8_t> Checksum,
unsigned ChecksumKind) {
if (!getContext().getCVContext().addFile(*this, FileNo, Filename, Checksum,
ChecksumKind))
return false;
OS << "\t.cv_file\t" << FileNo << ' ';
PrintQuotedString(Filename, OS);
if (!ChecksumKind) {
EmitEOL();
return true;
}
OS << ' ';
PrintQuotedString(toHex(Checksum), OS);
OS << ' ' << ChecksumKind;
EmitEOL();
return true;
}
bool MCAsmStreamer::EmitCVFuncIdDirective(unsigned FuncId) {
OS << "\t.cv_func_id " << FuncId << '\n';
return MCStreamer::EmitCVFuncIdDirective(FuncId);
}
bool MCAsmStreamer::EmitCVInlineSiteIdDirective(unsigned FunctionId,
unsigned IAFunc,
unsigned IAFile,
unsigned IALine, unsigned IACol,
SMLoc Loc) {
OS << "\t.cv_inline_site_id " << FunctionId << " within " << IAFunc
<< " inlined_at " << IAFile << ' ' << IALine << ' ' << IACol << '\n';
return MCStreamer::EmitCVInlineSiteIdDirective(FunctionId, IAFunc, IAFile,
IALine, IACol, Loc);
}
void MCAsmStreamer::EmitCVLocDirective(unsigned FunctionId, unsigned FileNo,
unsigned Line, unsigned Column,
bool PrologueEnd, bool IsStmt,
StringRef FileName, SMLoc Loc) {
// Validate the directive.
if (!checkCVLocSection(FunctionId, FileNo, Loc))
return;
OS << "\t.cv_loc\t" << FunctionId << " " << FileNo << " " << Line << " "
<< Column;
if (PrologueEnd)
OS << " prologue_end";
if (IsStmt)
OS << " is_stmt 1";
if (IsVerboseAsm) {
OS.PadToColumn(MAI->getCommentColumn());
OS << MAI->getCommentString() << ' ' << FileName << ':' << Line << ':'
<< Column;
}
EmitEOL();
}
void MCAsmStreamer::EmitCVLinetableDirective(unsigned FunctionId,
const MCSymbol *FnStart,
const MCSymbol *FnEnd) {
OS << "\t.cv_linetable\t" << FunctionId << ", ";
FnStart->print(OS, MAI);
OS << ", ";
FnEnd->print(OS, MAI);
EmitEOL();
this->MCStreamer::EmitCVLinetableDirective(FunctionId, FnStart, FnEnd);
}
void MCAsmStreamer::EmitCVInlineLinetableDirective(unsigned PrimaryFunctionId,
unsigned SourceFileId,
unsigned SourceLineNum,
const MCSymbol *FnStartSym,
const MCSymbol *FnEndSym) {
OS << "\t.cv_inline_linetable\t" << PrimaryFunctionId << ' ' << SourceFileId
<< ' ' << SourceLineNum << ' ';
FnStartSym->print(OS, MAI);
OS << ' ';
FnEndSym->print(OS, MAI);
EmitEOL();
this->MCStreamer::EmitCVInlineLinetableDirective(
PrimaryFunctionId, SourceFileId, SourceLineNum, FnStartSym, FnEndSym);
}
void MCAsmStreamer::PrintCVDefRangePrefix(
ArrayRef<std::pair<const MCSymbol *, const MCSymbol *>> Ranges) {
OS << "\t.cv_def_range\t";
for (std::pair<const MCSymbol *, const MCSymbol *> Range : Ranges) {
OS << ' ';
Range.first->print(OS, MAI);
OS << ' ';
Range.second->print(OS, MAI);
}
}
void MCAsmStreamer::EmitCVDefRangeDirective(
ArrayRef<std::pair<const MCSymbol *, const MCSymbol *>> Ranges,
codeview::DefRangeRegisterRelHeader DRHdr) {
PrintCVDefRangePrefix(Ranges);
OS << ", reg_rel, ";
OS << DRHdr.Register << ", " << DRHdr.Flags << ", "
<< DRHdr.BasePointerOffset;
EmitEOL();
}
void MCAsmStreamer::EmitCVDefRangeDirective(
ArrayRef<std::pair<const MCSymbol *, const MCSymbol *>> Ranges,
codeview::DefRangeSubfieldRegisterHeader DRHdr) {
PrintCVDefRangePrefix(Ranges);
OS << ", subfield_reg, ";
OS << DRHdr.Register << ", " << DRHdr.OffsetInParent;
EmitEOL();
}
void MCAsmStreamer::EmitCVDefRangeDirective(
ArrayRef<std::pair<const MCSymbol *, const MCSymbol *>> Ranges,
codeview::DefRangeRegisterHeader DRHdr) {
PrintCVDefRangePrefix(Ranges);
OS << ", reg, ";
OS << DRHdr.Register;
EmitEOL();
}
void MCAsmStreamer::EmitCVDefRangeDirective(
ArrayRef<std::pair<const MCSymbol *, const MCSymbol *>> Ranges,
codeview::DefRangeFramePointerRelHeader DRHdr) {
PrintCVDefRangePrefix(Ranges);
OS << ", frame_ptr_rel, ";
OS << DRHdr.Offset;
EmitEOL();
}
void MCAsmStreamer::EmitCVStringTableDirective() {
OS << "\t.cv_stringtable";
EmitEOL();
}
void MCAsmStreamer::EmitCVFileChecksumsDirective() {
OS << "\t.cv_filechecksums";
EmitEOL();
}
void MCAsmStreamer::EmitCVFileChecksumOffsetDirective(unsigned FileNo) {
OS << "\t.cv_filechecksumoffset\t" << FileNo;
EmitEOL();
}
void MCAsmStreamer::EmitCVFPOData(const MCSymbol *ProcSym, SMLoc L) {
OS << "\t.cv_fpo_data\t";
ProcSym->print(OS, MAI);
EmitEOL();
}
void MCAsmStreamer::EmitIdent(StringRef IdentString) {
assert(MAI->hasIdentDirective() && ".ident directive not supported");
OS << "\t.ident\t";
PrintQuotedString(IdentString, OS);
EmitEOL();
}
void MCAsmStreamer::EmitCFISections(bool EH, bool Debug) {
MCStreamer::EmitCFISections(EH, Debug);
OS << "\t.cfi_sections ";
if (EH) {
OS << ".eh_frame";
if (Debug)
OS << ", .debug_frame";
} else if (Debug) {
OS << ".debug_frame";
}
EmitEOL();
}
void MCAsmStreamer::EmitCFIStartProcImpl(MCDwarfFrameInfo &Frame) {
OS << "\t.cfi_startproc";
if (Frame.IsSimple)
OS << " simple";
EmitEOL();
}
void MCAsmStreamer::EmitCFIEndProcImpl(MCDwarfFrameInfo &Frame) {
MCStreamer::EmitCFIEndProcImpl(Frame);
OS << "\t.cfi_endproc";
EmitEOL();
}
void MCAsmStreamer::EmitRegisterName(int64_t Register) {
if (!MAI->useDwarfRegNumForCFI()) {
// User .cfi_* directives can use arbitrary DWARF register numbers, not
// just ones that map to LLVM register numbers and have known names.
// Fall back to using the original number directly if no name is known.
const MCRegisterInfo *MRI = getContext().getRegisterInfo();
if (Optional<unsigned> LLVMRegister = MRI->getLLVMRegNum(Register, true)) {
InstPrinter->printRegName(OS, *LLVMRegister);
return;
}
}
OS << Register;
}
void MCAsmStreamer::EmitCFIDefCfa(int64_t Register, int64_t Offset) {
MCStreamer::EmitCFIDefCfa(Register, Offset);
OS << "\t.cfi_def_cfa ";
EmitRegisterName(Register);
OS << ", " << Offset;
EmitEOL();
}
void MCAsmStreamer::EmitCFIDefCfaOffset(int64_t Offset) {
MCStreamer::EmitCFIDefCfaOffset(Offset);
OS << "\t.cfi_def_cfa_offset " << Offset;
EmitEOL();
}
static void PrintCFIEscape(llvm::formatted_raw_ostream &OS, StringRef Values) {
OS << "\t.cfi_escape ";
if (!Values.empty()) {
size_t e = Values.size() - 1;
for (size_t i = 0; i < e; ++i)
OS << format("0x%02x", uint8_t(Values[i])) << ", ";
OS << format("0x%02x", uint8_t(Values[e]));
}
}
void MCAsmStreamer::EmitCFIEscape(StringRef Values) {
MCStreamer::EmitCFIEscape(Values);
PrintCFIEscape(OS, Values);
EmitEOL();
}
void MCAsmStreamer::EmitCFIGnuArgsSize(int64_t Size) {
MCStreamer::EmitCFIGnuArgsSize(Size);
uint8_t Buffer[16] = { dwarf::DW_CFA_GNU_args_size };
unsigned Len = encodeULEB128(Size, Buffer + 1) + 1;
PrintCFIEscape(OS, StringRef((const char *)&Buffer[0], Len));
EmitEOL();
}
void MCAsmStreamer::EmitCFIDefCfaRegister(int64_t Register) {
MCStreamer::EmitCFIDefCfaRegister(Register);
OS << "\t.cfi_def_cfa_register ";
EmitRegisterName(Register);
EmitEOL();
}
void MCAsmStreamer::EmitCFIOffset(int64_t Register, int64_t Offset) {
this->MCStreamer::EmitCFIOffset(Register, Offset);
OS << "\t.cfi_offset ";
EmitRegisterName(Register);
OS << ", " << Offset;
EmitEOL();
}
void MCAsmStreamer::EmitCFIPersonality(const MCSymbol *Sym,
unsigned Encoding) {
MCStreamer::EmitCFIPersonality(Sym, Encoding);
OS << "\t.cfi_personality " << Encoding << ", ";
Sym->print(OS, MAI);
EmitEOL();
}
void MCAsmStreamer::EmitCFILsda(const MCSymbol *Sym, unsigned Encoding) {
MCStreamer::EmitCFILsda(Sym, Encoding);
OS << "\t.cfi_lsda " << Encoding << ", ";
Sym->print(OS, MAI);
EmitEOL();
}
void MCAsmStreamer::EmitCFIRememberState() {
MCStreamer::EmitCFIRememberState();
OS << "\t.cfi_remember_state";
EmitEOL();
}
void MCAsmStreamer::EmitCFIRestoreState() {
MCStreamer::EmitCFIRestoreState();
OS << "\t.cfi_restore_state";
EmitEOL();
}
void MCAsmStreamer::EmitCFIRestore(int64_t Register) {
MCStreamer::EmitCFIRestore(Register);
OS << "\t.cfi_restore ";
EmitRegisterName(Register);
EmitEOL();
}
void MCAsmStreamer::EmitCFISameValue(int64_t Register) {
MCStreamer::EmitCFISameValue(Register);
OS << "\t.cfi_same_value ";
EmitRegisterName(Register);
EmitEOL();
}
void MCAsmStreamer::EmitCFIRelOffset(int64_t Register, int64_t Offset) {
MCStreamer::EmitCFIRelOffset(Register, Offset);
OS << "\t.cfi_rel_offset ";
EmitRegisterName(Register);
OS << ", " << Offset;
EmitEOL();
}
void MCAsmStreamer::EmitCFIAdjustCfaOffset(int64_t Adjustment) {
MCStreamer::EmitCFIAdjustCfaOffset(Adjustment);
OS << "\t.cfi_adjust_cfa_offset " << Adjustment;
EmitEOL();
}
void MCAsmStreamer::EmitCFISignalFrame() {
MCStreamer::EmitCFISignalFrame();
OS << "\t.cfi_signal_frame";
EmitEOL();
}
void MCAsmStreamer::EmitCFIUndefined(int64_t Register) {
MCStreamer::EmitCFIUndefined(Register);
OS << "\t.cfi_undefined " << Register;
EmitEOL();
}
void MCAsmStreamer::EmitCFIRegister(int64_t Register1, int64_t Register2) {
MCStreamer::EmitCFIRegister(Register1, Register2);
OS << "\t.cfi_register " << Register1 << ", " << Register2;
EmitEOL();
}
void MCAsmStreamer::EmitCFIWindowSave() {
MCStreamer::EmitCFIWindowSave();
OS << "\t.cfi_window_save";
EmitEOL();
}
void MCAsmStreamer::EmitCFINegateRAState() {
MCStreamer::EmitCFINegateRAState();
OS << "\t.cfi_negate_ra_state";
EmitEOL();
}
void MCAsmStreamer::EmitCFIReturnColumn(int64_t Register) {
MCStreamer::EmitCFIReturnColumn(Register);
OS << "\t.cfi_return_column " << Register;
EmitEOL();
}
void MCAsmStreamer::EmitCFIBKeyFrame() {
MCStreamer::EmitCFIBKeyFrame();
OS << "\t.cfi_b_key_frame";
EmitEOL();
}
void MCAsmStreamer::EmitWinCFIStartProc(const MCSymbol *Symbol, SMLoc Loc) {
MCStreamer::EmitWinCFIStartProc(Symbol, Loc);
OS << ".seh_proc ";
Symbol->print(OS, MAI);
EmitEOL();
}
void MCAsmStreamer::EmitWinCFIEndProc(SMLoc Loc) {
MCStreamer::EmitWinCFIEndProc(Loc);
OS << "\t.seh_endproc";
EmitEOL();
}
// TODO: Implement
void MCAsmStreamer::EmitWinCFIFuncletOrFuncEnd(SMLoc Loc) {
}
void MCAsmStreamer::EmitWinCFIStartChained(SMLoc Loc) {
MCStreamer::EmitWinCFIStartChained(Loc);
OS << "\t.seh_startchained";
EmitEOL();
}
void MCAsmStreamer::EmitWinCFIEndChained(SMLoc Loc) {
MCStreamer::EmitWinCFIEndChained(Loc);
OS << "\t.seh_endchained";
EmitEOL();
}
void MCAsmStreamer::EmitWinEHHandler(const MCSymbol *Sym, bool Unwind,
bool Except, SMLoc Loc) {
MCStreamer::EmitWinEHHandler(Sym, Unwind, Except, Loc);
OS << "\t.seh_handler ";
Sym->print(OS, MAI);
if (Unwind)
OS << ", @unwind";
if (Except)
OS << ", @except";
EmitEOL();
}
void MCAsmStreamer::EmitWinEHHandlerData(SMLoc Loc) {
MCStreamer::EmitWinEHHandlerData(Loc);
// Switch sections. Don't call SwitchSection directly, because that will
// cause the section switch to be visible in the emitted assembly.
// We only do this so the section switch that terminates the handler
// data block is visible.
WinEH::FrameInfo *CurFrame = getCurrentWinFrameInfo();
// Do nothing if no frame is open. MCStreamer should've already reported an
// error.
if (!CurFrame)
return;
MCSection *TextSec = &CurFrame->Function->getSection();
MCSection *XData = getAssociatedXDataSection(TextSec);
SwitchSectionNoChange(XData);
OS << "\t.seh_handlerdata";
EmitEOL();
}
void MCAsmStreamer::EmitWinCFIPushReg(MCRegister Register, SMLoc Loc) {
MCStreamer::EmitWinCFIPushReg(Register, Loc);
OS << "\t.seh_pushreg ";
InstPrinter->printRegName(OS, Register);
EmitEOL();
}
void MCAsmStreamer::EmitWinCFISetFrame(MCRegister Register, unsigned Offset,
SMLoc Loc) {
MCStreamer::EmitWinCFISetFrame(Register, Offset, Loc);
OS << "\t.seh_setframe ";
InstPrinter->printRegName(OS, Register);
OS << ", " << Offset;
EmitEOL();
}
void MCAsmStreamer::EmitWinCFIAllocStack(unsigned Size, SMLoc Loc) {
MCStreamer::EmitWinCFIAllocStack(Size, Loc);
OS << "\t.seh_stackalloc " << Size;
EmitEOL();
}
void MCAsmStreamer::EmitWinCFISaveReg(MCRegister Register, unsigned Offset,
SMLoc Loc) {
MCStreamer::EmitWinCFISaveReg(Register, Offset, Loc);
OS << "\t.seh_savereg ";
InstPrinter->printRegName(OS, Register);
OS << ", " << Offset;
EmitEOL();
}
void MCAsmStreamer::EmitWinCFISaveXMM(MCRegister Register, unsigned Offset,
SMLoc Loc) {
MCStreamer::EmitWinCFISaveXMM(Register, Offset, Loc);
OS << "\t.seh_savexmm ";
InstPrinter->printRegName(OS, Register);
OS << ", " << Offset;
EmitEOL();
}
void MCAsmStreamer::EmitWinCFIPushFrame(bool Code, SMLoc Loc) {
MCStreamer::EmitWinCFIPushFrame(Code, Loc);
OS << "\t.seh_pushframe";
if (Code)
OS << " @code";
EmitEOL();
}
void MCAsmStreamer::EmitWinCFIEndProlog(SMLoc Loc) {
MCStreamer::EmitWinCFIEndProlog(Loc);
OS << "\t.seh_endprologue";
EmitEOL();
}
void MCAsmStreamer::emitCGProfileEntry(const MCSymbolRefExpr *From,
const MCSymbolRefExpr *To,
uint64_t Count) {
OS << "\t.cg_profile ";
From->getSymbol().print(OS, MAI);
OS << ", ";
To->getSymbol().print(OS, MAI);
OS << ", " << Count;
EmitEOL();
}
void MCAsmStreamer::AddEncodingComment(const MCInst &Inst,
const MCSubtargetInfo &STI) {
raw_ostream &OS = GetCommentOS();
SmallString<256> Code;
SmallVector<MCFixup, 4> Fixups;
raw_svector_ostream VecOS(Code);
// If we have no code emitter, don't emit code.
if (!getAssembler().getEmitterPtr())
return;
getAssembler().getEmitter().encodeInstruction(Inst, VecOS, Fixups, STI);
// If we are showing fixups, create symbolic markers in the encoded
// representation. We do this by making a per-bit map to the fixup item index,
// then trying to display it as nicely as possible.
SmallVector<uint8_t, 64> FixupMap;
FixupMap.resize(Code.size() * 8);
for (unsigned i = 0, e = Code.size() * 8; i != e; ++i)
FixupMap[i] = 0;
for (unsigned i = 0, e = Fixups.size(); i != e; ++i) {
MCFixup &F = Fixups[i];
const MCFixupKindInfo &Info =
getAssembler().getBackend().getFixupKindInfo(F.getKind());
for (unsigned j = 0; j != Info.TargetSize; ++j) {
unsigned Index = F.getOffset() * 8 + Info.TargetOffset + j;
assert(Index < Code.size() * 8 && "Invalid offset in fixup!");
FixupMap[Index] = 1 + i;
}
}
// FIXME: Note the fixup comments for Thumb2 are completely bogus since the
// high order halfword of a 32-bit Thumb2 instruction is emitted first.
OS << "encoding: [";
for (unsigned i = 0, e = Code.size(); i != e; ++i) {
if (i)
OS << ',';
// See if all bits are the same map entry.
uint8_t MapEntry = FixupMap[i * 8 + 0];
for (unsigned j = 1; j != 8; ++j) {
if (FixupMap[i * 8 + j] == MapEntry)
continue;
MapEntry = uint8_t(~0U);
break;
}
if (MapEntry != uint8_t(~0U)) {
if (MapEntry == 0) {
OS << format("0x%02x", uint8_t(Code[i]));
} else {
if (Code[i]) {
// FIXME: Some of the 8 bits require fix up.
OS << format("0x%02x", uint8_t(Code[i])) << '\''
<< char('A' + MapEntry - 1) << '\'';
} else
OS << char('A' + MapEntry - 1);
}
} else {
// Otherwise, write out in binary.
OS << "0b";
for (unsigned j = 8; j--;) {
unsigned Bit = (Code[i] >> j) & 1;
unsigned FixupBit;
if (MAI->isLittleEndian())
FixupBit = i * 8 + j;
else
FixupBit = i * 8 + (7-j);
if (uint8_t MapEntry = FixupMap[FixupBit]) {
assert(Bit == 0 && "Encoder wrote into fixed up bit!");
OS << char('A' + MapEntry - 1);
} else
OS << Bit;
}
}
}
OS << "]\n";
for (unsigned i = 0, e = Fixups.size(); i != e; ++i) {
MCFixup &F = Fixups[i];
const MCFixupKindInfo &Info =
getAssembler().getBackend().getFixupKindInfo(F.getKind());
OS << " fixup " << char('A' + i) << " - " << "offset: " << F.getOffset()
<< ", value: " << *F.getValue() << ", kind: " << Info.Name << "\n";
}
}
void MCAsmStreamer::EmitInstruction(const MCInst &Inst,
const MCSubtargetInfo &STI) {
assert(getCurrentSectionOnly() &&
"Cannot emit contents before setting section!");
// Show the encoding in a comment if we have a code emitter.
AddEncodingComment(Inst, STI);
// Show the MCInst if enabled.
if (ShowInst) {
Inst.dump_pretty(GetCommentOS(), InstPrinter.get(), "\n ");
GetCommentOS() << "\n";
}
if(getTargetStreamer())
getTargetStreamer()->prettyPrintAsm(*InstPrinter, 0, Inst, STI, OS);
else
InstPrinter->printInst(&Inst, 0, "", STI, OS);
StringRef Comments = CommentToEmit;
if (Comments.size() && Comments.back() != '\n')
GetCommentOS() << "\n";
EmitEOL();
}
void MCAsmStreamer::EmitBundleAlignMode(unsigned AlignPow2) {
OS << "\t.bundle_align_mode " << AlignPow2;
EmitEOL();
}
void MCAsmStreamer::EmitBundleLock(bool AlignToEnd) {
OS << "\t.bundle_lock";
if (AlignToEnd)
OS << " align_to_end";
EmitEOL();
}
void MCAsmStreamer::EmitBundleUnlock() {
OS << "\t.bundle_unlock";
EmitEOL();
}
bool MCAsmStreamer::EmitRelocDirective(const MCExpr &Offset, StringRef Name,
const MCExpr *Expr, SMLoc,
const MCSubtargetInfo &STI) {
OS << "\t.reloc ";
Offset.print(OS, MAI);
OS << ", " << Name;
if (Expr) {
OS << ", ";
Expr->print(OS, MAI);
}
EmitEOL();
return false;
}
void MCAsmStreamer::EmitAddrsig() {
OS << "\t.addrsig";
EmitEOL();
}
void MCAsmStreamer::EmitAddrsigSym(const MCSymbol *Sym) {
OS << "\t.addrsig_sym ";
Sym->print(OS, MAI);
EmitEOL();
}
/// EmitRawText - If this file is backed by an assembly streamer, this dumps
/// the specified string in the output .s file. This capability is
/// indicated by the hasRawTextSupport() predicate.
void MCAsmStreamer::EmitRawTextImpl(StringRef String) {
if (!String.empty() && String.back() == '\n')
String = String.substr(0, String.size()-1);
OS << String;
EmitEOL();
}
void MCAsmStreamer::FinishImpl() {
// If we are generating dwarf for assembly source files dump out the sections.
if (getContext().getGenDwarfForAssembly())
MCGenDwarfInfo::Emit(this);
// Emit the label for the line table, if requested - since the rest of the
// line table will be defined by .loc/.file directives, and not emitted
// directly, the label is the only work required here.
const auto &Tables = getContext().getMCDwarfLineTables();
if (!Tables.empty()) {
assert(Tables.size() == 1 && "asm output only supports one line table");
if (auto *Label = Tables.begin()->second.getLabel()) {
SwitchSection(getContext().getObjectFileInfo()->getDwarfLineSection());
EmitLabel(Label);
}
}
}
MCStreamer *llvm::createAsmStreamer(MCContext &Context,
std::unique_ptr<formatted_raw_ostream> OS,
bool isVerboseAsm, bool useDwarfDirectory,
MCInstPrinter *IP,
std::unique_ptr<MCCodeEmitter> &&CE,
std::unique_ptr<MCAsmBackend> &&MAB,
bool ShowInst) {
return new MCAsmStreamer(Context, std::move(OS), isVerboseAsm,
useDwarfDirectory, IP, std::move(CE), std::move(MAB),
ShowInst);
}
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