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llvm/lib/MC/MCStreamer.cpp
Oliver Stannard f4f85607e0 [Assembler] Better error messages for .org directive 
Currently, the error messages we emit for the .org directive when the
expression is not absolute or is out of range do not include the line
number of the directive, so it can be hard to track down the problem if
a file contains many .org directives.

This patch stores the source location in the MCOrgFragment, so that it
can be used for diagnostics emitted during layout.

Since layout is an iterative process, and the errors are detected during
each iteration, it would have been possible for errors to be reported
multiple times. To prevent this, I've made the assembler bail out after
each iteration if any errors have been reported. This will still allow
multiple unrelated errors to be reported in the common case where they
are all detected in the first round of layout.

Differential Revision: https://reviews.llvm.org/D27411



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@289643 91177308-0d34-0410-b5e6-96231b3b80d8
2016-12-14 10:43:58 +00:00

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//===- lib/MC/MCStreamer.cpp - Streaming Machine Code Output --------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "llvm/MC/MCStreamer.h"
#include "llvm/ADT/SmallString.h"
#include "llvm/ADT/Twine.h"
#include "llvm/MC/MCAsmBackend.h"
#include "llvm/MC/MCAsmInfo.h"
#include "llvm/MC/MCCodeView.h"
#include "llvm/MC/MCContext.h"
#include "llvm/MC/MCExpr.h"
#include "llvm/MC/MCInst.h"
#include "llvm/MC/MCInstPrinter.h"
#include "llvm/MC/MCObjectFileInfo.h"
#include "llvm/MC/MCObjectWriter.h"
#include "llvm/MC/MCSection.h"
#include "llvm/MC/MCSectionCOFF.h"
#include "llvm/MC/MCSymbol.h"
#include "llvm/MC/MCWin64EH.h"
#include "llvm/Support/COFF.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/LEB128.h"
#include "llvm/Support/raw_ostream.h"
#include <cstdlib>
using namespace llvm;
// Pin the vtables to this file.
MCTargetStreamer::~MCTargetStreamer() {}
MCTargetStreamer::MCTargetStreamer(MCStreamer &S) : Streamer(S) {
S.setTargetStreamer(this);
}
void MCTargetStreamer::emitLabel(MCSymbol *Symbol) {}
void MCTargetStreamer::finish() {}
void MCTargetStreamer::emitAssignment(MCSymbol *Symbol, const MCExpr *Value) {}
MCStreamer::MCStreamer(MCContext &Ctx)
: Context(Ctx), CurrentWinFrameInfo(nullptr) {
SectionStack.push_back(std::pair<MCSectionSubPair, MCSectionSubPair>());
}
MCStreamer::~MCStreamer() {
for (unsigned i = 0; i < getNumWinFrameInfos(); ++i)
delete WinFrameInfos[i];
}
void MCStreamer::reset() {
DwarfFrameInfos.clear();
for (unsigned i = 0; i < getNumWinFrameInfos(); ++i)
delete WinFrameInfos[i];
WinFrameInfos.clear();
CurrentWinFrameInfo = nullptr;
SymbolOrdering.clear();
SectionStack.clear();
SectionStack.push_back(std::pair<MCSectionSubPair, MCSectionSubPair>());
}
raw_ostream &MCStreamer::GetCommentOS() {
// By default, discard comments.
return nulls();
}
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");
char buf[8];
const bool isLittleEndian = Context.getAsmInfo()->isLittleEndian();
for (unsigned i = 0; i != Size; ++i) {
unsigned index = isLittleEndian ? i : (Size - i - 1);
buf[i] = uint8_t(Value >> (index * 8));
}
EmitBytes(StringRef(buf, Size));
}
/// EmitULEB128Value - Special case of EmitULEB128Value that avoids the
/// client having to pass in a MCExpr for constant integers.
void MCStreamer::EmitULEB128IntValue(uint64_t Value, unsigned Padding) {
SmallString<128> Tmp;
raw_svector_ostream OSE(Tmp);
encodeULEB128(Value, OSE, Padding);
EmitBytes(OSE.str());
}
/// EmitSLEB128Value - 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);
}
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) {
for (uint64_t i = 0, e = NumBytes; i != e; ++i)
EmitIntValue(FillValue, 1);
}
void MCStreamer::emitFill(uint64_t NumValues, int64_t Size, int64_t Expr) {
int64_t NonZeroSize = Size > 4 ? 4 : Size;
Expr &= ~0ULL >> (64 - NonZeroSize * 8);
for (uint64_t i = 0, e = NumValues; i != e; ++i) {
EmitIntValue(Expr, NonZeroSize);
if (NonZeroSize < Size)
EmitIntValue(0, Size - NonZeroSize);
}
}
/// The implementation in this class just redirects to emitFill.
void MCStreamer::EmitZeros(uint64_t NumBytes) {
emitFill(NumBytes, 0);
}
unsigned MCStreamer::EmitDwarfFileDirective(unsigned FileNo,
StringRef Directory,
StringRef Filename, unsigned CUID) {
return getContext().getDwarfFile(Directory, Filename, FileNo, CUID);
}
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();
}
MCDwarfFrameInfo *MCStreamer::getCurrentDwarfFrameInfo() {
if (DwarfFrameInfos.empty())
return nullptr;
return &DwarfFrameInfos.back();
}
bool MCStreamer::hasUnfinishedDwarfFrameInfo() {
MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
return CurFrame && !CurFrame->End;
}
void MCStreamer::EnsureValidDwarfFrame() {
MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
if (!CurFrame || CurFrame->End)
report_fatal_error("No open frame");
}
bool MCStreamer::EmitCVFileDirective(unsigned FileNo, StringRef Filename) {
return getContext().getCVContext().addFile(FileNo, Filename);
}
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) {
CodeViewContext &CVC = getContext().getCVContext();
MCCVFunctionInfo *FI = CVC.getCVFunctionInfo(FunctionId);
if (!FI)
return getContext().reportError(
Loc, "function id not introduced by .cv_func_id or .cv_inline_site_id");
// Track the section
if (FI->Section == nullptr)
FI->Section = getCurrentSectionOnly();
else if (FI->Section != getCurrentSectionOnly())
return getContext().reportError(
Loc,
"all .cv_loc directives for a function must be in the same section");
CVC.setCurrentCVLoc(FunctionId, FileNo, Line, Column, PrologueEnd, IsStmt);
}
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) {}
void MCStreamer::EmitCVDefRangeDirective(
ArrayRef<std::pair<const MCSymbol *, const MCSymbol *>> Ranges,
StringRef FixedSizePortion) {}
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) {
assert(!Symbol->isVariable() && "Cannot emit a variable symbol!");
assert(getCurrentSectionOnly() && "Cannot emit before setting section!");
assert(!Symbol->getFragment() && "Unexpected fragment on symbol data!");
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) {
if (hasUnfinishedDwarfFrameInfo())
report_fatal_error("Starting a 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() {
EnsureValidDwarfFrame();
MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
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() {
MCSymbol *Label = getContext().createTempSymbol("cfi", true);
EmitLabel(Label);
return Label;
}
MCSymbol *MCStreamer::EmitCFICommon() {
EnsureValidDwarfFrame();
return EmitCFILabel();
}
void MCStreamer::EmitCFIDefCfa(int64_t Register, int64_t Offset) {
MCSymbol *Label = EmitCFICommon();
MCCFIInstruction Instruction =
MCCFIInstruction::createDefCfa(Label, Register, Offset);
MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
CurFrame->Instructions.push_back(Instruction);
CurFrame->CurrentCfaRegister = static_cast<unsigned>(Register);
}
void MCStreamer::EmitCFIDefCfaOffset(int64_t Offset) {
MCSymbol *Label = EmitCFICommon();
MCCFIInstruction Instruction =
MCCFIInstruction::createDefCfaOffset(Label, Offset);
MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
CurFrame->Instructions.push_back(Instruction);
}
void MCStreamer::EmitCFIAdjustCfaOffset(int64_t Adjustment) {
MCSymbol *Label = EmitCFICommon();
MCCFIInstruction Instruction =
MCCFIInstruction::createAdjustCfaOffset(Label, Adjustment);
MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
CurFrame->Instructions.push_back(Instruction);
}
void MCStreamer::EmitCFIDefCfaRegister(int64_t Register) {
MCSymbol *Label = EmitCFICommon();
MCCFIInstruction Instruction =
MCCFIInstruction::createDefCfaRegister(Label, Register);
MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
CurFrame->Instructions.push_back(Instruction);
CurFrame->CurrentCfaRegister = static_cast<unsigned>(Register);
}
void MCStreamer::EmitCFIOffset(int64_t Register, int64_t Offset) {
MCSymbol *Label = EmitCFICommon();
MCCFIInstruction Instruction =
MCCFIInstruction::createOffset(Label, Register, Offset);
MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
CurFrame->Instructions.push_back(Instruction);
}
void MCStreamer::EmitCFIRelOffset(int64_t Register, int64_t Offset) {
MCSymbol *Label = EmitCFICommon();
MCCFIInstruction Instruction =
MCCFIInstruction::createRelOffset(Label, Register, Offset);
MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
CurFrame->Instructions.push_back(Instruction);
}
void MCStreamer::EmitCFIPersonality(const MCSymbol *Sym,
unsigned Encoding) {
EnsureValidDwarfFrame();
MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
CurFrame->Personality = Sym;
CurFrame->PersonalityEncoding = Encoding;
}
void MCStreamer::EmitCFILsda(const MCSymbol *Sym, unsigned Encoding) {
EnsureValidDwarfFrame();
MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
CurFrame->Lsda = Sym;
CurFrame->LsdaEncoding = Encoding;
}
void MCStreamer::EmitCFIRememberState() {
MCSymbol *Label = EmitCFICommon();
MCCFIInstruction Instruction = MCCFIInstruction::createRememberState(Label);
MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
CurFrame->Instructions.push_back(Instruction);
}
void MCStreamer::EmitCFIRestoreState() {
// FIXME: Error if there is no matching cfi_remember_state.
MCSymbol *Label = EmitCFICommon();
MCCFIInstruction Instruction = MCCFIInstruction::createRestoreState(Label);
MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
CurFrame->Instructions.push_back(Instruction);
}
void MCStreamer::EmitCFISameValue(int64_t Register) {
MCSymbol *Label = EmitCFICommon();
MCCFIInstruction Instruction =
MCCFIInstruction::createSameValue(Label, Register);
MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
CurFrame->Instructions.push_back(Instruction);
}
void MCStreamer::EmitCFIRestore(int64_t Register) {
MCSymbol *Label = EmitCFICommon();
MCCFIInstruction Instruction =
MCCFIInstruction::createRestore(Label, Register);
MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
CurFrame->Instructions.push_back(Instruction);
}
void MCStreamer::EmitCFIEscape(StringRef Values) {
MCSymbol *Label = EmitCFICommon();
MCCFIInstruction Instruction = MCCFIInstruction::createEscape(Label, Values);
MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
CurFrame->Instructions.push_back(Instruction);
}
void MCStreamer::EmitCFIGnuArgsSize(int64_t Size) {
MCSymbol *Label = EmitCFICommon();
MCCFIInstruction Instruction =
MCCFIInstruction::createGnuArgsSize(Label, Size);
MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
CurFrame->Instructions.push_back(Instruction);
}
void MCStreamer::EmitCFISignalFrame() {
EnsureValidDwarfFrame();
MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
CurFrame->IsSignalFrame = true;
}
void MCStreamer::EmitCFIUndefined(int64_t Register) {
MCSymbol *Label = EmitCFICommon();
MCCFIInstruction Instruction =
MCCFIInstruction::createUndefined(Label, Register);
MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
CurFrame->Instructions.push_back(Instruction);
}
void MCStreamer::EmitCFIRegister(int64_t Register1, int64_t Register2) {
MCSymbol *Label = EmitCFICommon();
MCCFIInstruction Instruction =
MCCFIInstruction::createRegister(Label, Register1, Register2);
MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
CurFrame->Instructions.push_back(Instruction);
}
void MCStreamer::EmitCFIWindowSave() {
MCSymbol *Label = EmitCFICommon();
MCCFIInstruction Instruction =
MCCFIInstruction::createWindowSave(Label);
MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
CurFrame->Instructions.push_back(Instruction);
}
void MCStreamer::EnsureValidWinFrameInfo() {
const MCAsmInfo *MAI = Context.getAsmInfo();
if (!MAI->usesWindowsCFI())
report_fatal_error(".seh_* directives are not supported on this target");
if (!CurrentWinFrameInfo || CurrentWinFrameInfo->End)
report_fatal_error("No open Win64 EH frame function!");
}
void MCStreamer::EmitWinCFIStartProc(const MCSymbol *Symbol) {
const MCAsmInfo *MAI = Context.getAsmInfo();
if (!MAI->usesWindowsCFI())
report_fatal_error(".seh_* directives are not supported on this target");
if (CurrentWinFrameInfo && !CurrentWinFrameInfo->End)
report_fatal_error("Starting a function before ending the previous one!");
MCSymbol *StartProc = EmitCFILabel();
WinFrameInfos.push_back(new WinEH::FrameInfo(Symbol, StartProc));
CurrentWinFrameInfo = WinFrameInfos.back();
CurrentWinFrameInfo->TextSection = getCurrentSectionOnly();
}
void MCStreamer::EmitWinCFIEndProc() {
EnsureValidWinFrameInfo();
if (CurrentWinFrameInfo->ChainedParent)
report_fatal_error("Not all chained regions terminated!");
MCSymbol *Label = EmitCFILabel();
CurrentWinFrameInfo->End = Label;
}
void MCStreamer::EmitWinCFIStartChained() {
EnsureValidWinFrameInfo();
MCSymbol *StartProc = EmitCFILabel();
WinFrameInfos.push_back(new WinEH::FrameInfo(CurrentWinFrameInfo->Function,
StartProc, CurrentWinFrameInfo));
CurrentWinFrameInfo = WinFrameInfos.back();
CurrentWinFrameInfo->TextSection = getCurrentSectionOnly();
}
void MCStreamer::EmitWinCFIEndChained() {
EnsureValidWinFrameInfo();
if (!CurrentWinFrameInfo->ChainedParent)
report_fatal_error("End of a chained region outside a chained region!");
MCSymbol *Label = EmitCFILabel();
CurrentWinFrameInfo->End = Label;
CurrentWinFrameInfo =
const_cast<WinEH::FrameInfo *>(CurrentWinFrameInfo->ChainedParent);
}
void MCStreamer::EmitWinEHHandler(const MCSymbol *Sym, bool Unwind,
bool Except) {
EnsureValidWinFrameInfo();
if (CurrentWinFrameInfo->ChainedParent)
report_fatal_error("Chained unwind areas can't have handlers!");
CurrentWinFrameInfo->ExceptionHandler = Sym;
if (!Except && !Unwind)
report_fatal_error("Don't know what kind of handler this is!");
if (Unwind)
CurrentWinFrameInfo->HandlesUnwind = true;
if (Except)
CurrentWinFrameInfo->HandlesExceptions = true;
}
void MCStreamer::EmitWinEHHandlerData() {
EnsureValidWinFrameInfo();
if (CurrentWinFrameInfo->ChainedParent)
report_fatal_error("Chained unwind areas can't have handlers!");
}
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);
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();
return Context.getAssociativeCOFFSection(cast<MCSectionCOFF>(MainCFISec),
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() {}
void MCStreamer::EmitWinCFIPushReg(unsigned Register) {
EnsureValidWinFrameInfo();
MCSymbol *Label = EmitCFILabel();
WinEH::Instruction Inst = Win64EH::Instruction::PushNonVol(Label, Register);
CurrentWinFrameInfo->Instructions.push_back(Inst);
}
void MCStreamer::EmitWinCFISetFrame(unsigned Register, unsigned Offset) {
EnsureValidWinFrameInfo();
if (CurrentWinFrameInfo->LastFrameInst >= 0)
report_fatal_error("Frame register and offset already specified!");
if (Offset & 0x0F)
report_fatal_error("Misaligned frame pointer offset!");
if (Offset > 240)
report_fatal_error("Frame offset must be less than or equal to 240!");
MCSymbol *Label = EmitCFILabel();
WinEH::Instruction Inst =
Win64EH::Instruction::SetFPReg(Label, Register, Offset);
CurrentWinFrameInfo->LastFrameInst = CurrentWinFrameInfo->Instructions.size();
CurrentWinFrameInfo->Instructions.push_back(Inst);
}
void MCStreamer::EmitWinCFIAllocStack(unsigned Size) {
EnsureValidWinFrameInfo();
if (Size == 0)
report_fatal_error("Allocation size must be non-zero!");
if (Size & 7)
report_fatal_error("Misaligned stack allocation!");
MCSymbol *Label = EmitCFILabel();
WinEH::Instruction Inst = Win64EH::Instruction::Alloc(Label, Size);
CurrentWinFrameInfo->Instructions.push_back(Inst);
}
void MCStreamer::EmitWinCFISaveReg(unsigned Register, unsigned Offset) {
EnsureValidWinFrameInfo();
if (Offset & 7)
report_fatal_error("Misaligned saved register offset!");
MCSymbol *Label = EmitCFILabel();
WinEH::Instruction Inst =
Win64EH::Instruction::SaveNonVol(Label, Register, Offset);
CurrentWinFrameInfo->Instructions.push_back(Inst);
}
void MCStreamer::EmitWinCFISaveXMM(unsigned Register, unsigned Offset) {
EnsureValidWinFrameInfo();
if (Offset & 0x0F)
report_fatal_error("Misaligned saved vector register offset!");
MCSymbol *Label = EmitCFILabel();
WinEH::Instruction Inst =
Win64EH::Instruction::SaveXMM(Label, Register, Offset);
CurrentWinFrameInfo->Instructions.push_back(Inst);
}
void MCStreamer::EmitWinCFIPushFrame(bool Code) {
EnsureValidWinFrameInfo();
if (CurrentWinFrameInfo->Instructions.size() > 0)
report_fatal_error("If present, PushMachFrame must be the first UOP");
MCSymbol *Label = EmitCFILabel();
WinEH::Instruction Inst = Win64EH::Instruction::PushMachFrame(Label, Code);
CurrentWinFrameInfo->Instructions.push_back(Inst);
}
void MCStreamer::EmitWinCFIEndProlog() {
EnsureValidWinFrameInfo();
MCSymbol *Label = EmitCFILabel();
CurrentWinFrameInfo->PrologEnd = Label;
}
void MCStreamer::EmitCOFFSafeSEH(MCSymbol const *Symbol) {
}
void MCStreamer::EmitCOFFSectionIndex(MCSymbol const *Symbol) {
}
void MCStreamer::EmitCOFFSecRel32(MCSymbol const *Symbol) {
}
/// 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) {
errs() << "EmitRawText called on an MCStreamer that doesn't support it, "
" something must not be fully mc'ized\n";
abort();
}
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)
report_fatal_error("Unfinished frame!");
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, raw_ostream &OS,
const MCInst &Inst, const MCSubtargetInfo &STI) {
InstPrinter.printInst(&Inst, OS, "", STI);
}
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 &STI) {
// 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::EmitAssemblerFlag(MCAssemblerFlag Flag) {}
void MCStreamer::EmitThumbFunc(MCSymbol *Func) {}
void MCStreamer::EmitSymbolDesc(MCSymbol *Symbol, unsigned DescValue) {}
void MCStreamer::BeginCOFFSymbolDef(const MCSymbol *Symbol) {}
void MCStreamer::EndCOFFSymbolDef() {}
void MCStreamer::EmitFileDirective(StringRef Filename) {}
void MCStreamer::EmitCOFFSymbolStorageClass(int StorageClass) {}
void MCStreamer::EmitCOFFSymbolType(int Type) {}
void MCStreamer::emitELFSize(MCSymbol *Symbol, const MCExpr *Value) {}
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;
}
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