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llvm-mirror/lib/MC/MCAsmStreamer.cpp
Philip Reames 8de39d5e37 [BranchAlign] Compiler support for suppressing branch align 
As discussed heavily in the original review (D70157), there's a need for the compiler to be able to selective suppress padding (either nop or prefix) to respect assumptions about the meaning of labels and instructions in generated code.

Rather than wait for syntax to be finalized - which appears to be a very slow process - this patch focuses on the compiler use case and *only* worries about the integrated assembler. To my knowledge, this covers all cases mentioned to date for clang/JIT support.

For testing purposes, I wired it up so that if the integrated assembler was using autopadding for branch alignment (e.g. enabled at command line) then the textual assembly output would contain a comment for each location where padding was enabled or disabled. This seemed like the least painful choice overall.

Note that the result of this patch effective disables the jcc errata mitigation for many constructs (statepoints, implicit null checks, xray, etc...) which is non ideal. It is at least *correct* and should allow us to enable the mitigation for the compiler. Once that's done, and a few other items are worked through, we probably want to come back to this an explore a bundling based approach instead so that we can pad instructions while keeping labels in the right place.

Differential Revision: https://reviews.llvm.org/D72303
2020-01-08 10:03:30 -08:00

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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 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::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;
if (NumBytes.evaluateAsAbsolute(IntNumBytes) && IntNumBytes == 0)
return;
if (const char *ZeroDirective = MAI->getZeroDirective()) {
// FIXME: Emit location directives
OS << ZeroDirective;
NumBytes.print(OS, MAI);
if (FillValue != 0)
OS << ',' << (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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