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llvm-mirror/lib/MC/MCStreamer.cpp
jasonliu 3b7308f12c [XCOFF][AIX] Give symbol an internal name when desired symbol name contains invalid character(s) 
Summary:

When a desired symbol name contains invalid character that the
system assembler could not process, we need to emit .rename
directive in assembly path in order for that desired symbol name
to appear in the symbol table.

Reviewed By: hubert.reinterpretcast, DiggerLin, daltenty, Xiangling_L

Differential Revision: https://reviews.llvm.org/D82481
2020-07-06 15:49:15 +00:00

1252 lines
43 KiB
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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::emitXCOFFSymbolLinkageWithVisibility(MCSymbol *Symbol,
MCSymbolAttr Linkage,
MCSymbolAttr Visibility) {
llvm_unreachable("emitXCOFFSymbolLinkageWithVisibility is only supported on "
"XCOFF targets");
}
void MCStreamer::emitXCOFFRenameDirective(const MCSymbol *Name,
StringRef Rename) {
llvm_unreachable("emitXCOFFRenameDirective is 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;
}
static VersionTuple
targetVersionOrMinimumSupportedOSVersion(const Triple &Target,
VersionTuple TargetVersion) {
VersionTuple Min = Target.getMinimumSupportedOSVersion();
return !Min.empty() && Min > TargetVersion ? Min : TargetVersion;
}
static MCVersionMinType
getMachoVersionMinLoadCommandType(const Triple &Target) {
assert(Target.isOSDarwin() && "expected a darwin OS");
switch (Target.getOS()) {
case Triple::MacOSX:
case Triple::Darwin:
return MCVM_OSXVersionMin;
case Triple::IOS:
assert(!Target.isMacCatalystEnvironment() &&
"mac Catalyst should use LC_BUILD_VERSION");
return MCVM_IOSVersionMin;
case Triple::TvOS:
return MCVM_TvOSVersionMin;
case Triple::WatchOS:
return MCVM_WatchOSVersionMin;
default:
break;
}
llvm_unreachable("unexpected OS type");
}
static VersionTuple getMachoBuildVersionSupportedOS(const Triple &Target) {
assert(Target.isOSDarwin() && "expected a darwin OS");
switch (Target.getOS()) {
case Triple::MacOSX:
case Triple::Darwin:
return VersionTuple(10, 14);
case Triple::IOS:
// Mac Catalyst always uses the build version load command.
if (Target.isMacCatalystEnvironment())
return VersionTuple();
LLVM_FALLTHROUGH;
case Triple::TvOS:
return VersionTuple(12);
case Triple::WatchOS:
return VersionTuple(5);
default:
break;
}
llvm_unreachable("unexpected OS type");
}
static MachO::PlatformType
getMachoBuildVersionPlatformType(const Triple &Target) {
assert(Target.isOSDarwin() && "expected a darwin OS");
switch (Target.getOS()) {
case Triple::MacOSX:
case Triple::Darwin:
return MachO::PLATFORM_MACOS;
case Triple::IOS:
if (Target.isMacCatalystEnvironment())
return MachO::PLATFORM_MACCATALYST;
return Target.isSimulatorEnvironment() ? MachO::PLATFORM_IOSSIMULATOR
: MachO::PLATFORM_IOS;
case Triple::TvOS:
return Target.isSimulatorEnvironment() ? MachO::PLATFORM_TVOSSIMULATOR
: MachO::PLATFORM_TVOS;
case Triple::WatchOS:
return Target.isSimulatorEnvironment() ? MachO::PLATFORM_WATCHOSSIMULATOR
: MachO::PLATFORM_WATCHOS;
default:
break;
}
llvm_unreachable("unexpected OS type");
}
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 = 0;
unsigned Minor = 0;
unsigned Update = 0;
switch (Target.getOS()) {
case Triple::MacOSX:
case Triple::Darwin:
Target.getMacOSXVersion(Major, Minor, Update);
break;
case Triple::IOS:
case Triple::TvOS:
Target.getiOSVersion(Major, Minor, Update);
break;
case Triple::WatchOS:
Target.getWatchOSVersion(Major, Minor, Update);
break;
default:
llvm_unreachable("unexpected OS type");
}
assert(Major != 0 && "A non-zero major version is expected");
auto LinkedTargetVersion = targetVersionOrMinimumSupportedOSVersion(
Target, VersionTuple(Major, Minor, Update));
auto BuildVersionOSVersion = getMachoBuildVersionSupportedOS(Target);
if (BuildVersionOSVersion.empty() ||
LinkedTargetVersion >= BuildVersionOSVersion)
return emitBuildVersion(getMachoBuildVersionPlatformType(Target),
LinkedTargetVersion.getMajor(),
*LinkedTargetVersion.getMinor(),
*LinkedTargetVersion.getSubminor(), SDKVersion);
emitVersionMin(getMachoVersionMinLoadCommandType(Target),
LinkedTargetVersion.getMajor(),
*LinkedTargetVersion.getMinor(),
*LinkedTargetVersion.getSubminor(), SDKVersion);
}
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