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

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//===- lib/MC/MCStreamer.cpp - Streaming Machine Code Output --------------===//
//
// 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/MC/MCStreamer.h"
#include "llvm/ADT/Optional.h"
#include "llvm/ADT/SmallString.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/ADT/Twine.h"
#include "llvm/BinaryFormat/COFF.h"
#include "llvm/DebugInfo/CodeView/SymbolRecord.h"
#include "llvm/MC/MCAsmBackend.h"
#include "llvm/MC/MCAsmInfo.h"
#include "llvm/MC/MCCodeView.h"
#include "llvm/MC/MCContext.h"
#include "llvm/MC/MCDwarf.h"
#include "llvm/MC/MCExpr.h"
#include "llvm/MC/MCInst.h"
#include "llvm/MC/MCInstPrinter.h"
#include "llvm/MC/MCObjectFileInfo.h"
#include "llvm/MC/MCRegister.h"
#include "llvm/MC/MCRegisterInfo.h"
#include "llvm/MC/MCSection.h"
#include "llvm/MC/MCSectionCOFF.h"
#include "llvm/MC/MCSymbol.h"
#include "llvm/MC/MCWin64EH.h"
#include "llvm/MC/MCWinEH.h"
#include "llvm/Support/Casting.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/LEB128.h"
#include "llvm/Support/MathExtras.h"
#include "llvm/Support/raw_ostream.h"
#include <cassert>
#include <cstdint>
#include <cstdlib>
#include <utility>
using namespace llvm;
MCTargetStreamer::MCTargetStreamer(MCStreamer &S) : Streamer(S) {
S.setTargetStreamer(this);
}
// Pin the vtables to this file.
MCTargetStreamer::~MCTargetStreamer() = default;
void MCTargetStreamer::emitLabel(MCSymbol *Symbol) {}
void MCTargetStreamer::finish() {}
void MCTargetStreamer::changeSection(const MCSection *CurSection,
MCSection *Section,
const MCExpr *Subsection,
raw_ostream &OS) {
Section->PrintSwitchToSection(
*Streamer.getContext().getAsmInfo(),
Streamer.getContext().getObjectFileInfo()->getTargetTriple(), OS,
Subsection);
}
void MCTargetStreamer::emitDwarfFileDirective(StringRef Directive) {
Streamer.emitRawText(Directive);
}
void MCTargetStreamer::emitValue(const MCExpr *Value) {
SmallString<128> Str;
raw_svector_ostream OS(Str);
Value->print(OS, Streamer.getContext().getAsmInfo());
Streamer.emitRawText(OS.str());
}
void MCTargetStreamer::emitRawBytes(StringRef Data) {
const MCAsmInfo *MAI = Streamer.getContext().getAsmInfo();
const char *Directive = MAI->getData8bitsDirective();
for (const unsigned char C : Data.bytes()) {
SmallString<128> Str;
raw_svector_ostream OS(Str);
OS << Directive << (unsigned)C;
Streamer.emitRawText(OS.str());
}
}
void MCTargetStreamer::emitAssignment(MCSymbol *Symbol, const MCExpr *Value) {}
MCStreamer::MCStreamer(MCContext &Ctx)
: Context(Ctx), CurrentWinFrameInfo(nullptr),
UseAssemblerInfoForParsing(false) {
SectionStack.push_back(std::pair<MCSectionSubPair, MCSectionSubPair>());
}
MCStreamer::~MCStreamer() {}
void MCStreamer::reset() {
DwarfFrameInfos.clear();
CurrentWinFrameInfo = nullptr;
WinFrameInfos.clear();
SymbolOrdering.clear();
SectionStack.clear();
SectionStack.push_back(std::pair<MCSectionSubPair, MCSectionSubPair>());
}
raw_ostream &MCStreamer::GetCommentOS() {
// By default, discard comments.
return nulls();
}
unsigned MCStreamer::getNumFrameInfos() { return DwarfFrameInfos.size(); }
ArrayRef<MCDwarfFrameInfo> MCStreamer::getDwarfFrameInfos() const {
return DwarfFrameInfos;
}
void MCStreamer::emitRawComment(const Twine &T, bool TabPrefix) {}
void MCStreamer::addExplicitComment(const Twine &T) {}
void MCStreamer::emitExplicitComments() {}
void MCStreamer::generateCompactUnwindEncodings(MCAsmBackend *MAB) {
for (auto &FI : DwarfFrameInfos)
FI.CompactUnwindEncoding =
(MAB ? MAB->generateCompactUnwindEncoding(FI.Instructions) : 0);
}
/// EmitIntValue - Special case of EmitValue that avoids the client having to
/// pass in a MCExpr for constant integers.
void MCStreamer::emitIntValue(uint64_t Value, unsigned Size) {
assert(1 <= Size && Size <= 8 && "Invalid size");
assert((isUIntN(8 * Size, Value) || isIntN(8 * Size, Value)) &&
"Invalid size");
const bool IsLittleEndian = Context.getAsmInfo()->isLittleEndian();
uint64_t Swapped = support::endian::byte_swap(
Value, IsLittleEndian ? support::little : support::big);
unsigned Index = IsLittleEndian ? 0 : 8 - Size;
emitBytes(StringRef(reinterpret_cast<char *>(&Swapped) + Index, Size));
}
/// EmitULEB128IntValue - Special case of EmitULEB128Value that avoids the
/// client having to pass in a MCExpr for constant integers.
void MCStreamer::emitULEB128IntValue(uint64_t Value, unsigned PadTo) {
SmallString<128> Tmp;
raw_svector_ostream OSE(Tmp);
encodeULEB128(Value, OSE, PadTo);
emitBytes(OSE.str());
}
/// EmitSLEB128IntValue - Special case of EmitSLEB128Value that avoids the
/// client having to pass in a MCExpr for constant integers.
void MCStreamer::emitSLEB128IntValue(int64_t Value) {
SmallString<128> Tmp;
raw_svector_ostream OSE(Tmp);
encodeSLEB128(Value, OSE);
emitBytes(OSE.str());
}
void MCStreamer::emitValue(const MCExpr *Value, unsigned Size, SMLoc Loc) {
emitValueImpl(Value, Size, Loc);
}
void MCStreamer::emitSymbolValue(const MCSymbol *Sym, unsigned Size,
bool IsSectionRelative) {
assert((!IsSectionRelative || Size == 4) &&
"SectionRelative value requires 4-bytes");
if (!IsSectionRelative)
emitValueImpl(MCSymbolRefExpr::create(Sym, getContext()), Size);
else
EmitCOFFSecRel32(Sym, /*Offset=*/0);
}
void MCStreamer::emitDTPRel64Value(const MCExpr *Value) {
report_fatal_error("unsupported directive in streamer");
}
void MCStreamer::emitDTPRel32Value(const MCExpr *Value) {
report_fatal_error("unsupported directive in streamer");
}
void MCStreamer::emitTPRel64Value(const MCExpr *Value) {
report_fatal_error("unsupported directive in streamer");
}
void MCStreamer::emitTPRel32Value(const MCExpr *Value) {
report_fatal_error("unsupported directive in streamer");
}
void MCStreamer::emitGPRel64Value(const MCExpr *Value) {
report_fatal_error("unsupported directive in streamer");
}
void MCStreamer::emitGPRel32Value(const MCExpr *Value) {
report_fatal_error("unsupported directive in streamer");
}
/// Emit NumBytes bytes worth of the value specified by FillValue.
/// This implements directives such as '.space'.
void MCStreamer::emitFill(uint64_t NumBytes, uint8_t FillValue) {
emitFill(*MCConstantExpr::create(NumBytes, getContext()), FillValue);
}
/// The implementation in this class just redirects to emitFill.
void MCStreamer::emitZeros(uint64_t NumBytes) { emitFill(NumBytes, 0); }
Expected<unsigned>
MCStreamer::tryEmitDwarfFileDirective(unsigned FileNo, StringRef Directory,
StringRef Filename,
Optional<MD5::MD5Result> Checksum,
Optional<StringRef> Source,
unsigned CUID) {
return getContext().getDwarfFile(Directory, Filename, FileNo, Checksum,
Source, CUID);
}
void MCStreamer::emitDwarfFile0Directive(StringRef Directory,
StringRef Filename,
Optional<MD5::MD5Result> Checksum,
Optional<StringRef> Source,
unsigned CUID) {
getContext().setMCLineTableRootFile(CUID, Directory, Filename, Checksum,
Source);
}
void MCStreamer::emitCFIBKeyFrame() {
MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
if (!CurFrame)
return;
CurFrame->IsBKeyFrame = true;
}
void MCStreamer::emitDwarfLocDirective(unsigned FileNo, unsigned Line,
unsigned Column, unsigned Flags,
unsigned Isa, unsigned Discriminator,
StringRef FileName) {
getContext().setCurrentDwarfLoc(FileNo, Line, Column, Flags, Isa,
Discriminator);
}
MCSymbol *MCStreamer::getDwarfLineTableSymbol(unsigned CUID) {
MCDwarfLineTable &Table = getContext().getMCDwarfLineTable(CUID);
if (!Table.getLabel()) {
StringRef Prefix = Context.getAsmInfo()->getPrivateGlobalPrefix();
Table.setLabel(
Context.getOrCreateSymbol(Prefix + "line_table_start" + Twine(CUID)));
}
return Table.getLabel();
}
bool MCStreamer::hasUnfinishedDwarfFrameInfo() {
return !DwarfFrameInfos.empty() && !DwarfFrameInfos.back().End;
}
MCDwarfFrameInfo *MCStreamer::getCurrentDwarfFrameInfo() {
if (!hasUnfinishedDwarfFrameInfo()) {
getContext().reportError(SMLoc(), "this directive must appear between "
".cfi_startproc and .cfi_endproc "
"directives");
return nullptr;
}
return &DwarfFrameInfos.back();
}
bool MCStreamer::EmitCVFileDirective(unsigned FileNo, StringRef Filename,
ArrayRef<uint8_t> Checksum,
unsigned ChecksumKind) {
return getContext().getCVContext().addFile(*this, FileNo, Filename, Checksum,
ChecksumKind);
}
bool MCStreamer::EmitCVFuncIdDirective(unsigned FunctionId) {
return getContext().getCVContext().recordFunctionId(FunctionId);
}
bool MCStreamer::EmitCVInlineSiteIdDirective(unsigned FunctionId,
unsigned IAFunc, unsigned IAFile,
unsigned IALine, unsigned IACol,
SMLoc Loc) {
if (getContext().getCVContext().getCVFunctionInfo(IAFunc) == nullptr) {
getContext().reportError(Loc, "parent function id not introduced by "
".cv_func_id or .cv_inline_site_id");
return true;
}
return getContext().getCVContext().recordInlinedCallSiteId(
FunctionId, IAFunc, IAFile, IALine, IACol);
}
void MCStreamer::emitCVLocDirective(unsigned FunctionId, unsigned FileNo,
unsigned Line, unsigned Column,
bool PrologueEnd, bool IsStmt,
StringRef FileName, SMLoc Loc) {}
bool MCStreamer::checkCVLocSection(unsigned FuncId, unsigned FileNo,
SMLoc Loc) {
CodeViewContext &CVC = getContext().getCVContext();
MCCVFunctionInfo *FI = CVC.getCVFunctionInfo(FuncId);
if (!FI) {
getContext().reportError(
Loc, "function id not introduced by .cv_func_id or .cv_inline_site_id");
return false;
}
// Track the section
if (FI->Section == nullptr)
FI->Section = getCurrentSectionOnly();
else if (FI->Section != getCurrentSectionOnly()) {
getContext().reportError(
Loc,
"all .cv_loc directives for a function must be in the same section");
return false;
}
return true;
}
void MCStreamer::emitCVLinetableDirective(unsigned FunctionId,
const MCSymbol *Begin,
const MCSymbol *End) {}
void MCStreamer::emitCVInlineLinetableDirective(unsigned PrimaryFunctionId,
unsigned SourceFileId,
unsigned SourceLineNum,
const MCSymbol *FnStartSym,
const MCSymbol *FnEndSym) {}
/// Only call this on endian-specific types like ulittle16_t and little32_t, or
/// structs composed of them.
template <typename T>
static void copyBytesForDefRange(SmallString<20> &BytePrefix,
codeview::SymbolKind SymKind,
const T &DefRangeHeader) {
BytePrefix.resize(2 + sizeof(T));
codeview::ulittle16_t SymKindLE = codeview::ulittle16_t(SymKind);
memcpy(&BytePrefix[0], &SymKindLE, 2);
memcpy(&BytePrefix[2], &DefRangeHeader, sizeof(T));
}
void MCStreamer::emitCVDefRangeDirective(
ArrayRef<std::pair<const MCSymbol *, const MCSymbol *>> Ranges,
StringRef FixedSizePortion) {}
void MCStreamer::emitCVDefRangeDirective(
ArrayRef<std::pair<const MCSymbol *, const MCSymbol *>> Ranges,
codeview::DefRangeRegisterRelHeader DRHdr) {
SmallString<20> BytePrefix;
copyBytesForDefRange(BytePrefix, codeview::S_DEFRANGE_REGISTER_REL, DRHdr);
emitCVDefRangeDirective(Ranges, BytePrefix);
}
void MCStreamer::emitCVDefRangeDirective(
ArrayRef<std::pair<const MCSymbol *, const MCSymbol *>> Ranges,
codeview::DefRangeSubfieldRegisterHeader DRHdr) {
SmallString<20> BytePrefix;
copyBytesForDefRange(BytePrefix, codeview::S_DEFRANGE_SUBFIELD_REGISTER,
DRHdr);
emitCVDefRangeDirective(Ranges, BytePrefix);
}
void MCStreamer::emitCVDefRangeDirective(
ArrayRef<std::pair<const MCSymbol *, const MCSymbol *>> Ranges,
codeview::DefRangeRegisterHeader DRHdr) {
SmallString<20> BytePrefix;
copyBytesForDefRange(BytePrefix, codeview::S_DEFRANGE_REGISTER, DRHdr);
emitCVDefRangeDirective(Ranges, BytePrefix);
}
void MCStreamer::emitCVDefRangeDirective(
ArrayRef<std::pair<const MCSymbol *, const MCSymbol *>> Ranges,
codeview::DefRangeFramePointerRelHeader DRHdr) {
SmallString<20> BytePrefix;
copyBytesForDefRange(BytePrefix, codeview::S_DEFRANGE_FRAMEPOINTER_REL,
DRHdr);
emitCVDefRangeDirective(Ranges, BytePrefix);
}
void MCStreamer::emitEHSymAttributes(const MCSymbol *Symbol,
MCSymbol *EHSymbol) {
}
void MCStreamer::InitSections(bool NoExecStack) {
SwitchSection(getContext().getObjectFileInfo()->getTextSection());
}
void MCStreamer::AssignFragment(MCSymbol *Symbol, MCFragment *Fragment) {
assert(Fragment);
Symbol->setFragment(Fragment);
// As we emit symbols into a section, track the order so that they can
// be sorted upon later. Zero is reserved to mean 'unemitted'.
SymbolOrdering[Symbol] = 1 + SymbolOrdering.size();
}
void MCStreamer::emitLabel(MCSymbol *Symbol, SMLoc Loc) {
Symbol->redefineIfPossible();
if (!Symbol->isUndefined() || Symbol->isVariable())
return getContext().reportError(Loc, "invalid symbol redefinition");
assert(!Symbol->isVariable() && "Cannot emit a variable symbol!");
assert(getCurrentSectionOnly() && "Cannot emit before setting section!");
assert(!Symbol->getFragment() && "Unexpected fragment on symbol data!");
assert(Symbol->isUndefined() && "Cannot define a symbol twice!");
Symbol->setFragment(&getCurrentSectionOnly()->getDummyFragment());
MCTargetStreamer *TS = getTargetStreamer();
if (TS)
TS->emitLabel(Symbol);
}
void MCStreamer::emitCFISections(bool EH, bool Debug) {
assert(EH || Debug);
}
void MCStreamer::emitCFIStartProc(bool IsSimple, SMLoc Loc) {
if (hasUnfinishedDwarfFrameInfo())
return getContext().reportError(
Loc, "starting new .cfi frame before finishing the previous one");
MCDwarfFrameInfo Frame;
Frame.IsSimple = IsSimple;
emitCFIStartProcImpl(Frame);
const MCAsmInfo* MAI = Context.getAsmInfo();
if (MAI) {
for (const MCCFIInstruction& Inst : MAI->getInitialFrameState()) {
if (Inst.getOperation() == MCCFIInstruction::OpDefCfa ||
Inst.getOperation() == MCCFIInstruction::OpDefCfaRegister) {
Frame.CurrentCfaRegister = Inst.getRegister();
}
}
}
DwarfFrameInfos.push_back(Frame);
}
void MCStreamer::emitCFIStartProcImpl(MCDwarfFrameInfo &Frame) {
}
void MCStreamer::emitCFIEndProc() {
MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
if (!CurFrame)
return;
emitCFIEndProcImpl(*CurFrame);
}
void MCStreamer::emitCFIEndProcImpl(MCDwarfFrameInfo &Frame) {
// Put a dummy non-null value in Frame.End to mark that this frame has been
// closed.
Frame.End = (MCSymbol *)1;
}
MCSymbol *MCStreamer::emitCFILabel() {
// Return a dummy non-null value so that label fields appear filled in when
// generating textual assembly.
return (MCSymbol *)1;
}
void MCStreamer::emitCFIDefCfa(int64_t Register, int64_t Offset) {
MCSymbol *Label = emitCFILabel();
MCCFIInstruction Instruction =
MCCFIInstruction::cfiDefCfa(Label, Register, Offset);
MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
if (!CurFrame)
return;
CurFrame->Instructions.push_back(Instruction);
CurFrame->CurrentCfaRegister = static_cast<unsigned>(Register);
}
void MCStreamer::emitCFIDefCfaOffset(int64_t Offset) {
MCSymbol *Label = emitCFILabel();
MCCFIInstruction Instruction =
MCCFIInstruction::cfiDefCfaOffset(Label, Offset);
MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
if (!CurFrame)
return;
CurFrame->Instructions.push_back(Instruction);
}
void MCStreamer::emitCFIAdjustCfaOffset(int64_t Adjustment) {
MCSymbol *Label = emitCFILabel();
MCCFIInstruction Instruction =
MCCFIInstruction::createAdjustCfaOffset(Label, Adjustment);
MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
if (!CurFrame)
return;
CurFrame->Instructions.push_back(Instruction);
}
void MCStreamer::emitCFIDefCfaRegister(int64_t Register) {
MCSymbol *Label = emitCFILabel();
MCCFIInstruction Instruction =
MCCFIInstruction::createDefCfaRegister(Label, Register);
MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
if (!CurFrame)
return;
CurFrame->Instructions.push_back(Instruction);
CurFrame->CurrentCfaRegister = static_cast<unsigned>(Register);
}
void MCStreamer::emitCFIOffset(int64_t Register, int64_t Offset) {
MCSymbol *Label = emitCFILabel();
MCCFIInstruction Instruction =
MCCFIInstruction::createOffset(Label, Register, Offset);
MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
if (!CurFrame)
return;
CurFrame->Instructions.push_back(Instruction);
}
void MCStreamer::emitCFIRelOffset(int64_t Register, int64_t Offset) {
MCSymbol *Label = emitCFILabel();
MCCFIInstruction Instruction =
MCCFIInstruction::createRelOffset(Label, Register, Offset);
MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
if (!CurFrame)
return;
CurFrame->Instructions.push_back(Instruction);
}
void MCStreamer::emitCFIPersonality(const MCSymbol *Sym,
unsigned Encoding) {
MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
if (!CurFrame)
return;
CurFrame->Personality = Sym;
CurFrame->PersonalityEncoding = Encoding;
}
void MCStreamer::emitCFILsda(const MCSymbol *Sym, unsigned Encoding) {
MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
if (!CurFrame)
return;
CurFrame->Lsda = Sym;
CurFrame->LsdaEncoding = Encoding;
}
void MCStreamer::emitCFIRememberState() {
MCSymbol *Label = emitCFILabel();
MCCFIInstruction Instruction = MCCFIInstruction::createRememberState(Label);
MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
if (!CurFrame)
return;
CurFrame->Instructions.push_back(Instruction);
}
void MCStreamer::emitCFIRestoreState() {
// FIXME: Error if there is no matching cfi_remember_state.
MCSymbol *Label = emitCFILabel();
MCCFIInstruction Instruction = MCCFIInstruction::createRestoreState(Label);
MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
if (!CurFrame)
return;
CurFrame->Instructions.push_back(Instruction);
}
void MCStreamer::emitCFISameValue(int64_t Register) {
MCSymbol *Label = emitCFILabel();
MCCFIInstruction Instruction =
MCCFIInstruction::createSameValue(Label, Register);
MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
if (!CurFrame)
return;
CurFrame->Instructions.push_back(Instruction);
}
void MCStreamer::emitCFIRestore(int64_t Register) {
MCSymbol *Label = emitCFILabel();
MCCFIInstruction Instruction =
MCCFIInstruction::createRestore(Label, Register);
MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
if (!CurFrame)
return;
CurFrame->Instructions.push_back(Instruction);
}
void MCStreamer::emitCFIEscape(StringRef Values) {
MCSymbol *Label = emitCFILabel();
MCCFIInstruction Instruction = MCCFIInstruction::createEscape(Label, Values);
MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
if (!CurFrame)
return;
CurFrame->Instructions.push_back(Instruction);
}
void MCStreamer::emitCFIGnuArgsSize(int64_t Size) {
MCSymbol *Label = emitCFILabel();
MCCFIInstruction Instruction =
MCCFIInstruction::createGnuArgsSize(Label, Size);
MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
if (!CurFrame)
return;
CurFrame->Instructions.push_back(Instruction);
}
void MCStreamer::emitCFISignalFrame() {
MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
if (!CurFrame)
return;
CurFrame->IsSignalFrame = true;
}
void MCStreamer::emitCFIUndefined(int64_t Register) {
MCSymbol *Label = emitCFILabel();
MCCFIInstruction Instruction =
MCCFIInstruction::createUndefined(Label, Register);
MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
if (!CurFrame)
return;
CurFrame->Instructions.push_back(Instruction);
}
void MCStreamer::emitCFIRegister(int64_t Register1, int64_t Register2) {
MCSymbol *Label = emitCFILabel();
MCCFIInstruction Instruction =
MCCFIInstruction::createRegister(Label, Register1, Register2);
MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
if (!CurFrame)
return;
CurFrame->Instructions.push_back(Instruction);
}
void MCStreamer::emitCFIWindowSave() {
MCSymbol *Label = emitCFILabel();
MCCFIInstruction Instruction =
MCCFIInstruction::createWindowSave(Label);
MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
if (!CurFrame)
return;
CurFrame->Instructions.push_back(Instruction);
}
void MCStreamer::emitCFINegateRAState() {
MCSymbol *Label = emitCFILabel();
MCCFIInstruction Instruction = MCCFIInstruction::createNegateRAState(Label);
MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
if (!CurFrame)
return;
CurFrame->Instructions.push_back(Instruction);
}
void MCStreamer::emitCFIReturnColumn(int64_t Register) {
MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
if (!CurFrame)
return;
CurFrame->RAReg = Register;
}
WinEH::FrameInfo *MCStreamer::EnsureValidWinFrameInfo(SMLoc Loc) {
const MCAsmInfo *MAI = Context.getAsmInfo();
if (!MAI->usesWindowsCFI()) {
getContext().reportError(
Loc, ".seh_* directives are not supported on this target");
return nullptr;
}
if (!CurrentWinFrameInfo || CurrentWinFrameInfo->End) {
getContext().reportError(
Loc, ".seh_ directive must appear within an active frame");
return nullptr;
}
return CurrentWinFrameInfo;
}
void MCStreamer::EmitWinCFIStartProc(const MCSymbol *Symbol, SMLoc Loc) {
const MCAsmInfo *MAI = Context.getAsmInfo();
if (!MAI->usesWindowsCFI())
return getContext().reportError(
Loc, ".seh_* directives are not supported on this target");
if (CurrentWinFrameInfo && !CurrentWinFrameInfo->End)
getContext().reportError(
Loc, "Starting a function before ending the previous one!");
MCSymbol *StartProc = emitCFILabel();
WinFrameInfos.emplace_back(
std::make_unique<WinEH::FrameInfo>(Symbol, StartProc));
CurrentWinFrameInfo = WinFrameInfos.back().get();
CurrentWinFrameInfo->TextSection = getCurrentSectionOnly();
}
void MCStreamer::EmitWinCFIEndProc(SMLoc Loc) {
WinEH::FrameInfo *CurFrame = EnsureValidWinFrameInfo(Loc);
if (!CurFrame)
return;
if (CurFrame->ChainedParent)
getContext().reportError(Loc, "Not all chained regions terminated!");
MCSymbol *Label = emitCFILabel();
CurFrame->End = Label;
}
void MCStreamer::EmitWinCFIFuncletOrFuncEnd(SMLoc Loc) {
WinEH::FrameInfo *CurFrame = EnsureValidWinFrameInfo(Loc);
if (!CurFrame)
return;
if (CurFrame->ChainedParent)
getContext().reportError(Loc, "Not all chained regions terminated!");
MCSymbol *Label = emitCFILabel();
CurFrame->FuncletOrFuncEnd = Label;
}
void MCStreamer::EmitWinCFIStartChained(SMLoc Loc) {
WinEH::FrameInfo *CurFrame = EnsureValidWinFrameInfo(Loc);
if (!CurFrame)
return;
MCSymbol *StartProc = emitCFILabel();
WinFrameInfos.emplace_back(std::make_unique<WinEH::FrameInfo>(
CurFrame->Function, StartProc, CurFrame));
CurrentWinFrameInfo = WinFrameInfos.back().get();
CurrentWinFrameInfo->TextSection = getCurrentSectionOnly();
}
void MCStreamer::EmitWinCFIEndChained(SMLoc Loc) {
WinEH::FrameInfo *CurFrame = EnsureValidWinFrameInfo(Loc);
if (!CurFrame)
return;
if (!CurFrame->ChainedParent)
return getContext().reportError(
Loc, "End of a chained region outside a chained region!");
MCSymbol *Label = emitCFILabel();
CurFrame->End = Label;
CurrentWinFrameInfo = const_cast<WinEH::FrameInfo *>(CurFrame->ChainedParent);
}
void MCStreamer::EmitWinEHHandler(const MCSymbol *Sym, bool Unwind, bool Except,
SMLoc Loc) {
WinEH::FrameInfo *CurFrame = EnsureValidWinFrameInfo(Loc);
if (!CurFrame)
return;
if (CurFrame->ChainedParent)
return getContext().reportError(
Loc, "Chained unwind areas can't have handlers!");
CurFrame->ExceptionHandler = Sym;
if (!Except && !Unwind)
getContext().reportError(Loc, "Don't know what kind of handler this is!");
if (Unwind)
CurFrame->HandlesUnwind = true;
if (Except)
CurFrame->HandlesExceptions = true;
}
void MCStreamer::EmitWinEHHandlerData(SMLoc Loc) {
WinEH::FrameInfo *CurFrame = EnsureValidWinFrameInfo(Loc);
if (!CurFrame)
return;
if (CurFrame->ChainedParent)
getContext().reportError(Loc, "Chained unwind areas can't have handlers!");
}
void MCStreamer::emitCGProfileEntry(const MCSymbolRefExpr *From,
const MCSymbolRefExpr *To, uint64_t Count) {
}
static MCSection *getWinCFISection(MCContext &Context, unsigned *NextWinCFIID,
MCSection *MainCFISec,
const MCSection *TextSec) {
// If this is the main .text section, use the main unwind info section.
if (TextSec == Context.getObjectFileInfo()->getTextSection())
return MainCFISec;
const auto *TextSecCOFF = cast<MCSectionCOFF>(TextSec);
auto *MainCFISecCOFF = cast<MCSectionCOFF>(MainCFISec);
unsigned UniqueID = TextSecCOFF->getOrAssignWinCFISectionID(NextWinCFIID);
// If this section is COMDAT, this unwind section should be COMDAT associative
// with its group.
const MCSymbol *KeySym = nullptr;
if (TextSecCOFF->getCharacteristics() & COFF::IMAGE_SCN_LNK_COMDAT) {
KeySym = TextSecCOFF->getCOMDATSymbol();
// In a GNU environment, we can't use associative comdats. Instead, do what
// GCC does, which is to make plain comdat selectany section named like
// ".[px]data$_Z3foov".
if (!Context.getAsmInfo()->hasCOFFAssociativeComdats()) {
std::string SectionName = (MainCFISecCOFF->getName() + "$" +
TextSecCOFF->getName().split('$').second)
.str();
return Context.getCOFFSection(
SectionName,
MainCFISecCOFF->getCharacteristics() | COFF::IMAGE_SCN_LNK_COMDAT,
MainCFISecCOFF->getKind(), "", COFF::IMAGE_COMDAT_SELECT_ANY);
}
}
return Context.getAssociativeCOFFSection(MainCFISecCOFF, KeySym, UniqueID);
}
MCSection *MCStreamer::getAssociatedPDataSection(const MCSection *TextSec) {
return getWinCFISection(getContext(), &NextWinCFIID,
getContext().getObjectFileInfo()->getPDataSection(),
TextSec);
}
MCSection *MCStreamer::getAssociatedXDataSection(const MCSection *TextSec) {
return getWinCFISection(getContext(), &NextWinCFIID,
getContext().getObjectFileInfo()->getXDataSection(),
TextSec);
}
void MCStreamer::emitSyntaxDirective() {}
static unsigned encodeSEHRegNum(MCContext &Ctx, MCRegister Reg) {
return Ctx.getRegisterInfo()->getSEHRegNum(Reg);
}
void MCStreamer::EmitWinCFIPushReg(MCRegister Register, SMLoc Loc) {
WinEH::FrameInfo *CurFrame = EnsureValidWinFrameInfo(Loc);
if (!CurFrame)
return;
MCSymbol *Label = emitCFILabel();
WinEH::Instruction Inst = Win64EH::Instruction::PushNonVol(
Label, encodeSEHRegNum(Context, Register));
CurFrame->Instructions.push_back(Inst);
}
void MCStreamer::EmitWinCFISetFrame(MCRegister Register, unsigned Offset,
SMLoc Loc) {
WinEH::FrameInfo *CurFrame = EnsureValidWinFrameInfo(Loc);
if (!CurFrame)
return;
if (CurFrame->LastFrameInst >= 0)
return getContext().reportError(
Loc, "frame register and offset can be set at most once");
if (Offset & 0x0F)
return getContext().reportError(Loc, "offset is not a multiple of 16");
if (Offset > 240)
return getContext().reportError(
Loc, "frame offset must be less than or equal to 240");
MCSymbol *Label = emitCFILabel();
WinEH::Instruction Inst = Win64EH::Instruction::SetFPReg(
Label, encodeSEHRegNum(getContext(), Register), Offset);
CurFrame->LastFrameInst = CurFrame->Instructions.size();
CurFrame->Instructions.push_back(Inst);
}
void MCStreamer::EmitWinCFIAllocStack(unsigned Size, SMLoc Loc) {
WinEH::FrameInfo *CurFrame = EnsureValidWinFrameInfo(Loc);
if (!CurFrame)
return;
if (Size == 0)
return getContext().reportError(Loc,
"stack allocation size must be non-zero");
if (Size & 7)
return getContext().reportError(
Loc, "stack allocation size is not a multiple of 8");
MCSymbol *Label = emitCFILabel();
WinEH::Instruction Inst = Win64EH::Instruction::Alloc(Label, Size);
CurFrame->Instructions.push_back(Inst);
}
void MCStreamer::EmitWinCFISaveReg(MCRegister Register, unsigned Offset,
SMLoc Loc) {
WinEH::FrameInfo *CurFrame = EnsureValidWinFrameInfo(Loc);
if (!CurFrame)
return;
if (Offset & 7)
return getContext().reportError(
Loc, "register save offset is not 8 byte aligned");
MCSymbol *Label = emitCFILabel();
WinEH::Instruction Inst = Win64EH::Instruction::SaveNonVol(
Label, encodeSEHRegNum(Context, Register), Offset);
CurFrame->Instructions.push_back(Inst);
}
void MCStreamer::EmitWinCFISaveXMM(MCRegister Register, unsigned Offset,
SMLoc Loc) {
WinEH::FrameInfo *CurFrame = EnsureValidWinFrameInfo(Loc);
if (!CurFrame)
return;
if (Offset & 0x0F)
return getContext().reportError(Loc, "offset is not a multiple of 16");
MCSymbol *Label = emitCFILabel();
WinEH::Instruction Inst = Win64EH::Instruction::SaveXMM(
Label, encodeSEHRegNum(Context, Register), Offset);
CurFrame->Instructions.push_back(Inst);
}
void MCStreamer::EmitWinCFIPushFrame(bool Code, SMLoc Loc) {
WinEH::FrameInfo *CurFrame = EnsureValidWinFrameInfo(Loc);
if (!CurFrame)
return;
if (!CurFrame->Instructions.empty())
return getContext().reportError(
Loc, "If present, PushMachFrame must be the first UOP");
MCSymbol *Label = emitCFILabel();
WinEH::Instruction Inst = Win64EH::Instruction::PushMachFrame(Label, Code);
CurFrame->Instructions.push_back(Inst);
}
void MCStreamer::EmitWinCFIEndProlog(SMLoc Loc) {
WinEH::FrameInfo *CurFrame = EnsureValidWinFrameInfo(Loc);
if (!CurFrame)
return;
MCSymbol *Label = emitCFILabel();
CurFrame->PrologEnd = Label;
}
void MCStreamer::EmitCOFFSafeSEH(MCSymbol const *Symbol) {}
void MCStreamer::EmitCOFFSymbolIndex(MCSymbol const *Symbol) {}
void MCStreamer::EmitCOFFSectionIndex(MCSymbol const *Symbol) {}
void MCStreamer::EmitCOFFSecRel32(MCSymbol const *Symbol, uint64_t Offset) {}
void MCStreamer::EmitCOFFImgRel32(MCSymbol const *Symbol, int64_t Offset) {}
/// 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 MCStreamer::emitRawTextImpl(StringRef String) {
// This is not llvm_unreachable for the sake of out of tree backend
// developers who may not have assembly streamers and should serve as a
// reminder to not accidentally call EmitRawText in the absence of such.
report_fatal_error("EmitRawText called on an MCStreamer that doesn't support "
"it (target backend is likely missing an AsmStreamer "
"implementation)");
}
void MCStreamer::emitRawText(const Twine &T) {
SmallString<128> Str;
emitRawTextImpl(T.toStringRef(Str));
}
void MCStreamer::EmitWindowsUnwindTables() {
}
void MCStreamer::Finish() {
if ((!DwarfFrameInfos.empty() && !DwarfFrameInfos.back().End) ||
(!WinFrameInfos.empty() && !WinFrameInfos.back()->End)) {
getContext().reportError(SMLoc(), "Unfinished frame!");
return;
}
MCTargetStreamer *TS = getTargetStreamer();
if (TS)
TS->finish();
finishImpl();
}
void MCStreamer::emitAssignment(MCSymbol *Symbol, const MCExpr *Value) {
visitUsedExpr(*Value);
Symbol->setVariableValue(Value);
MCTargetStreamer *TS = getTargetStreamer();
if (TS)
TS->emitAssignment(Symbol, Value);
}
void MCTargetStreamer::prettyPrintAsm(MCInstPrinter &InstPrinter,
uint64_t Address, const MCInst &Inst,
const MCSubtargetInfo &STI,
raw_ostream &OS) {
InstPrinter.printInst(&Inst, Address, "", STI, OS);
}
void MCStreamer::visitUsedSymbol(const MCSymbol &Sym) {
}
void MCStreamer::visitUsedExpr(const MCExpr &Expr) {
switch (Expr.getKind()) {
case MCExpr::Target:
cast<MCTargetExpr>(Expr).visitUsedExpr(*this);
break;
case MCExpr::Constant:
break;
case MCExpr::Binary: {
const MCBinaryExpr &BE = cast<MCBinaryExpr>(Expr);
visitUsedExpr(*BE.getLHS());
visitUsedExpr(*BE.getRHS());
break;
}
case MCExpr::SymbolRef:
visitUsedSymbol(cast<MCSymbolRefExpr>(Expr).getSymbol());
break;
case MCExpr::Unary:
visitUsedExpr(*cast<MCUnaryExpr>(Expr).getSubExpr());
break;
}
}
void MCStreamer::emitInstruction(const MCInst &Inst, const MCSubtargetInfo &) {
// Scan for values.
for (unsigned i = Inst.getNumOperands(); i--;)
if (Inst.getOperand(i).isExpr())
visitUsedExpr(*Inst.getOperand(i).getExpr());
}
void MCStreamer::emitAbsoluteSymbolDiff(const MCSymbol *Hi, const MCSymbol *Lo,
unsigned Size) {
// Get the Hi-Lo expression.
const MCExpr *Diff =
MCBinaryExpr::createSub(MCSymbolRefExpr::create(Hi, Context),
MCSymbolRefExpr::create(Lo, Context), Context);
const MCAsmInfo *MAI = Context.getAsmInfo();
if (!MAI->doesSetDirectiveSuppressReloc()) {
emitValue(Diff, Size);
return;
}
// Otherwise, emit with .set (aka assignment).
MCSymbol *SetLabel = Context.createTempSymbol("set", true);
emitAssignment(SetLabel, Diff);
emitSymbolValue(SetLabel, Size);
}
void MCStreamer::emitAbsoluteSymbolDiffAsULEB128(const MCSymbol *Hi,
const MCSymbol *Lo) {
// Get the Hi-Lo expression.
const MCExpr *Diff =
MCBinaryExpr::createSub(MCSymbolRefExpr::create(Hi, Context),
MCSymbolRefExpr::create(Lo, Context), Context);
emitULEB128Value(Diff);
}
void MCStreamer::emitAssemblerFlag(MCAssemblerFlag Flag) {}
void MCStreamer::emitThumbFunc(MCSymbol *Func) {}
void MCStreamer::emitSymbolDesc(MCSymbol *Symbol, unsigned DescValue) {}
void MCStreamer::BeginCOFFSymbolDef(const MCSymbol *Symbol) {
llvm_unreachable("this directive only supported on COFF targets");
}
void MCStreamer::EndCOFFSymbolDef() {
llvm_unreachable("this directive only supported on COFF targets");
}
void MCStreamer::emitFileDirective(StringRef Filename) {}
void MCStreamer::EmitCOFFSymbolStorageClass(int StorageClass) {
llvm_unreachable("this directive only supported on COFF targets");
}
void MCStreamer::EmitCOFFSymbolType(int Type) {
llvm_unreachable("this directive only supported on COFF targets");
}
void MCStreamer::emitXCOFFLocalCommonSymbol(MCSymbol *LabelSym, uint64_t Size,
MCSymbol *CsectSym,
unsigned ByteAlign) {
llvm_unreachable("this directive only supported on XCOFF targets");
}
void MCStreamer::emitELFSize(MCSymbol *Symbol, const MCExpr *Value) {}
void MCStreamer::emitELFSymverDirective(StringRef AliasName,
const MCSymbol *Aliasee) {}
void MCStreamer::emitLocalCommonSymbol(MCSymbol *Symbol, uint64_t Size,
unsigned ByteAlignment) {}
void MCStreamer::emitTBSSSymbol(MCSection *Section, MCSymbol *Symbol,
uint64_t Size, unsigned ByteAlignment) {}
void MCStreamer::changeSection(MCSection *, const MCExpr *) {}
void MCStreamer::emitWeakReference(MCSymbol *Alias, const MCSymbol *Symbol) {}
void MCStreamer::emitBytes(StringRef Data) {}
void MCStreamer::emitBinaryData(StringRef Data) { emitBytes(Data); }
void MCStreamer::emitValueImpl(const MCExpr *Value, unsigned Size, SMLoc Loc) {
visitUsedExpr(*Value);
}
void MCStreamer::emitULEB128Value(const MCExpr *Value) {}
void MCStreamer::emitSLEB128Value(const MCExpr *Value) {}
void MCStreamer::emitFill(const MCExpr &NumBytes, uint64_t Value, SMLoc Loc) {}
void MCStreamer::emitFill(const MCExpr &NumValues, int64_t Size, int64_t Expr,
SMLoc Loc) {}
void MCStreamer::emitValueToAlignment(unsigned ByteAlignment, int64_t Value,
unsigned ValueSize,
unsigned MaxBytesToEmit) {}
void MCStreamer::emitCodeAlignment(unsigned ByteAlignment,
unsigned MaxBytesToEmit) {}
void MCStreamer::emitValueToOffset(const MCExpr *Offset, unsigned char Value,
SMLoc Loc) {}
void MCStreamer::emitBundleAlignMode(unsigned AlignPow2) {}
void MCStreamer::emitBundleLock(bool AlignToEnd) {}
void MCStreamer::finishImpl() {}
void MCStreamer::emitBundleUnlock() {}
void MCStreamer::SwitchSection(MCSection *Section, const MCExpr *Subsection) {
assert(Section && "Cannot switch to a null section!");
MCSectionSubPair curSection = SectionStack.back().first;
SectionStack.back().second = curSection;
if (MCSectionSubPair(Section, Subsection) != curSection) {
changeSection(Section, Subsection);
SectionStack.back().first = MCSectionSubPair(Section, Subsection);
assert(!Section->hasEnded() && "Section already ended");
MCSymbol *Sym = Section->getBeginSymbol();
if (Sym && !Sym->isInSection())
emitLabel(Sym);
}
}
MCSymbol *MCStreamer::endSection(MCSection *Section) {
// TODO: keep track of the last subsection so that this symbol appears in the
// correct place.
MCSymbol *Sym = Section->getEndSymbol(Context);
if (Sym->isInSection())
return Sym;
SwitchSection(Section);
emitLabel(Sym);
return Sym;
}
void MCStreamer::emitVersionForTarget(const Triple &Target,
const VersionTuple &SDKVersion) {
if (!Target.isOSBinFormatMachO() || !Target.isOSDarwin())
return;
// Do we even know the version?
if (Target.getOSMajorVersion() == 0)
return;
unsigned Major;
unsigned Minor;
unsigned Update;
if (Target.isMacCatalystEnvironment()) {
// Mac Catalyst always uses the build version load command.
Target.getiOSVersion(Major, Minor, Update);
assert(Major && "A non-zero major version is expected");
emitBuildVersion(MachO::PLATFORM_MACCATALYST, Major, Minor, Update,
SDKVersion);
return;
}
MCVersionMinType VersionType;
if (Target.isWatchOS()) {
VersionType = MCVM_WatchOSVersionMin;
Target.getWatchOSVersion(Major, Minor, Update);
} else if (Target.isTvOS()) {
VersionType = MCVM_TvOSVersionMin;
Target.getiOSVersion(Major, Minor, Update);
} else if (Target.isMacOSX()) {
VersionType = MCVM_OSXVersionMin;
if (!Target.getMacOSXVersion(Major, Minor, Update))
Major = 0;
} else {
VersionType = MCVM_IOSVersionMin;
Target.getiOSVersion(Major, Minor, Update);
}
if (Major != 0)
emitVersionMin(VersionType, Major, Minor, Update, SDKVersion);
}
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