733 lines
26 KiB
C++
733 lines
26 KiB
C++
//===- lib/MC/MCObjectStreamer.cpp - Object File MCStreamer Interface -----===//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file is distributed under the University of Illinois Open Source
|
|
// License. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#include "llvm/MC/MCObjectStreamer.h"
|
|
#include "llvm/ADT/STLExtras.h"
|
|
#include "llvm/MC/MCAsmBackend.h"
|
|
#include "llvm/MC/MCAssembler.h"
|
|
#include "llvm/MC/MCCodeEmitter.h"
|
|
#include "llvm/MC/MCCodeView.h"
|
|
#include "llvm/MC/MCContext.h"
|
|
#include "llvm/MC/MCDwarf.h"
|
|
#include "llvm/MC/MCExpr.h"
|
|
#include "llvm/MC/MCObjectWriter.h"
|
|
#include "llvm/MC/MCSection.h"
|
|
#include "llvm/MC/MCSymbol.h"
|
|
#include "llvm/Support/ErrorHandling.h"
|
|
#include "llvm/Support/SourceMgr.h"
|
|
using namespace llvm;
|
|
|
|
MCObjectStreamer::MCObjectStreamer(MCContext &Context,
|
|
std::unique_ptr<MCAsmBackend> TAB,
|
|
std::unique_ptr<MCObjectWriter> OW,
|
|
std::unique_ptr<MCCodeEmitter> Emitter)
|
|
: MCStreamer(Context),
|
|
Assembler(llvm::make_unique<MCAssembler>(
|
|
Context, std::move(TAB), std::move(Emitter), std::move(OW))),
|
|
EmitEHFrame(true), EmitDebugFrame(false) {}
|
|
|
|
MCObjectStreamer::~MCObjectStreamer() {}
|
|
|
|
// AssemblerPtr is used for evaluation of expressions and causes
|
|
// difference between asm and object outputs. Return nullptr to in
|
|
// inline asm mode to limit divergence to assembly inputs.
|
|
MCAssembler *MCObjectStreamer::getAssemblerPtr() {
|
|
if (getUseAssemblerInfoForParsing())
|
|
return Assembler.get();
|
|
return nullptr;
|
|
}
|
|
|
|
void MCObjectStreamer::flushPendingLabels(MCFragment *F, uint64_t FOffset) {
|
|
if (PendingLabels.empty())
|
|
return;
|
|
if (!F) {
|
|
F = new MCDataFragment();
|
|
MCSection *CurSection = getCurrentSectionOnly();
|
|
CurSection->getFragmentList().insert(CurInsertionPoint, F);
|
|
F->setParent(CurSection);
|
|
}
|
|
for (MCSymbol *Sym : PendingLabels) {
|
|
Sym->setFragment(F);
|
|
Sym->setOffset(FOffset);
|
|
}
|
|
PendingLabels.clear();
|
|
}
|
|
|
|
// When fixup's offset is a forward declared label, e.g.:
|
|
//
|
|
// .reloc 1f, R_MIPS_JALR, foo
|
|
// 1: nop
|
|
//
|
|
// postpone adding it to Fixups vector until the label is defined and its offset
|
|
// is known.
|
|
void MCObjectStreamer::resolvePendingFixups() {
|
|
for (PendingMCFixup &PendingFixup : PendingFixups) {
|
|
if (!PendingFixup.Sym || PendingFixup.Sym->isUndefined ()) {
|
|
getContext().reportError(PendingFixup.Fixup.getLoc(),
|
|
"unresolved relocation offset");
|
|
continue;
|
|
}
|
|
flushPendingLabels(PendingFixup.DF, PendingFixup.DF->getContents().size());
|
|
PendingFixup.Fixup.setOffset(PendingFixup.Sym->getOffset());
|
|
PendingFixup.DF->getFixups().push_back(PendingFixup.Fixup);
|
|
}
|
|
PendingFixups.clear();
|
|
}
|
|
|
|
// As a compile-time optimization, avoid allocating and evaluating an MCExpr
|
|
// tree for (Hi - Lo) when Hi and Lo are offsets into the same fragment.
|
|
static Optional<uint64_t>
|
|
absoluteSymbolDiff(MCAssembler &Asm, const MCSymbol *Hi, const MCSymbol *Lo) {
|
|
assert(Hi && Lo);
|
|
if (Asm.getBackendPtr()->requiresDiffExpressionRelocations())
|
|
return None;
|
|
|
|
if (!Hi->getFragment() || Hi->getFragment() != Lo->getFragment() ||
|
|
Hi->isVariable() || Lo->isVariable())
|
|
return None;
|
|
|
|
return Hi->getOffset() - Lo->getOffset();
|
|
}
|
|
|
|
void MCObjectStreamer::emitAbsoluteSymbolDiff(const MCSymbol *Hi,
|
|
const MCSymbol *Lo,
|
|
unsigned Size) {
|
|
if (Optional<uint64_t> Diff = absoluteSymbolDiff(getAssembler(), Hi, Lo)) {
|
|
EmitIntValue(*Diff, Size);
|
|
return;
|
|
}
|
|
MCStreamer::emitAbsoluteSymbolDiff(Hi, Lo, Size);
|
|
}
|
|
|
|
void MCObjectStreamer::emitAbsoluteSymbolDiffAsULEB128(const MCSymbol *Hi,
|
|
const MCSymbol *Lo) {
|
|
if (Optional<uint64_t> Diff = absoluteSymbolDiff(getAssembler(), Hi, Lo)) {
|
|
EmitULEB128IntValue(*Diff);
|
|
return;
|
|
}
|
|
MCStreamer::emitAbsoluteSymbolDiffAsULEB128(Hi, Lo);
|
|
}
|
|
|
|
void MCObjectStreamer::reset() {
|
|
if (Assembler)
|
|
Assembler->reset();
|
|
CurInsertionPoint = MCSection::iterator();
|
|
EmitEHFrame = true;
|
|
EmitDebugFrame = false;
|
|
PendingLabels.clear();
|
|
MCStreamer::reset();
|
|
}
|
|
|
|
void MCObjectStreamer::EmitFrames(MCAsmBackend *MAB) {
|
|
if (!getNumFrameInfos())
|
|
return;
|
|
|
|
if (EmitEHFrame)
|
|
MCDwarfFrameEmitter::Emit(*this, MAB, true);
|
|
|
|
if (EmitDebugFrame)
|
|
MCDwarfFrameEmitter::Emit(*this, MAB, false);
|
|
}
|
|
|
|
MCFragment *MCObjectStreamer::getCurrentFragment() const {
|
|
assert(getCurrentSectionOnly() && "No current section!");
|
|
|
|
if (CurInsertionPoint != getCurrentSectionOnly()->getFragmentList().begin())
|
|
return &*std::prev(CurInsertionPoint);
|
|
|
|
return nullptr;
|
|
}
|
|
|
|
static bool CanReuseDataFragment(const MCDataFragment &F,
|
|
const MCAssembler &Assembler,
|
|
const MCSubtargetInfo *STI) {
|
|
if (!F.hasInstructions())
|
|
return true;
|
|
// When bundling is enabled, we don't want to add data to a fragment that
|
|
// already has instructions (see MCELFStreamer::EmitInstToData for details)
|
|
if (Assembler.isBundlingEnabled())
|
|
return Assembler.getRelaxAll();
|
|
// If the subtarget is changed mid fragment we start a new fragment to record
|
|
// the new STI.
|
|
return !STI || F.getSubtargetInfo() == STI;
|
|
}
|
|
|
|
MCDataFragment *
|
|
MCObjectStreamer::getOrCreateDataFragment(const MCSubtargetInfo *STI) {
|
|
MCDataFragment *F = dyn_cast_or_null<MCDataFragment>(getCurrentFragment());
|
|
if (!F || !CanReuseDataFragment(*F, *Assembler, STI)) {
|
|
F = new MCDataFragment();
|
|
insert(F);
|
|
}
|
|
return F;
|
|
}
|
|
|
|
MCPaddingFragment *MCObjectStreamer::getOrCreatePaddingFragment() {
|
|
MCPaddingFragment *F =
|
|
dyn_cast_or_null<MCPaddingFragment>(getCurrentFragment());
|
|
if (!F) {
|
|
F = new MCPaddingFragment();
|
|
insert(F);
|
|
}
|
|
return F;
|
|
}
|
|
|
|
void MCObjectStreamer::visitUsedSymbol(const MCSymbol &Sym) {
|
|
Assembler->registerSymbol(Sym);
|
|
}
|
|
|
|
void MCObjectStreamer::EmitCFISections(bool EH, bool Debug) {
|
|
MCStreamer::EmitCFISections(EH, Debug);
|
|
EmitEHFrame = EH;
|
|
EmitDebugFrame = Debug;
|
|
}
|
|
|
|
void MCObjectStreamer::EmitValueImpl(const MCExpr *Value, unsigned Size,
|
|
SMLoc Loc) {
|
|
MCStreamer::EmitValueImpl(Value, Size, Loc);
|
|
MCDataFragment *DF = getOrCreateDataFragment();
|
|
flushPendingLabels(DF, DF->getContents().size());
|
|
|
|
MCDwarfLineEntry::Make(this, getCurrentSectionOnly());
|
|
|
|
// Avoid fixups when possible.
|
|
int64_t AbsValue;
|
|
if (Value->evaluateAsAbsolute(AbsValue, getAssemblerPtr())) {
|
|
if (!isUIntN(8 * Size, AbsValue) && !isIntN(8 * Size, AbsValue)) {
|
|
getContext().reportError(
|
|
Loc, "value evaluated as " + Twine(AbsValue) + " is out of range.");
|
|
return;
|
|
}
|
|
EmitIntValue(AbsValue, Size);
|
|
return;
|
|
}
|
|
DF->getFixups().push_back(
|
|
MCFixup::create(DF->getContents().size(), Value,
|
|
MCFixup::getKindForSize(Size, false), Loc));
|
|
DF->getContents().resize(DF->getContents().size() + Size, 0);
|
|
}
|
|
|
|
MCSymbol *MCObjectStreamer::EmitCFILabel() {
|
|
MCSymbol *Label = getContext().createTempSymbol("cfi", true);
|
|
EmitLabel(Label);
|
|
return Label;
|
|
}
|
|
|
|
void MCObjectStreamer::EmitCFIStartProcImpl(MCDwarfFrameInfo &Frame) {
|
|
// We need to create a local symbol to avoid relocations.
|
|
Frame.Begin = getContext().createTempSymbol();
|
|
EmitLabel(Frame.Begin);
|
|
}
|
|
|
|
void MCObjectStreamer::EmitCFIEndProcImpl(MCDwarfFrameInfo &Frame) {
|
|
Frame.End = getContext().createTempSymbol();
|
|
EmitLabel(Frame.End);
|
|
}
|
|
|
|
void MCObjectStreamer::EmitLabel(MCSymbol *Symbol, SMLoc Loc) {
|
|
MCStreamer::EmitLabel(Symbol, Loc);
|
|
|
|
getAssembler().registerSymbol(*Symbol);
|
|
|
|
// If there is a current fragment, mark the symbol as pointing into it.
|
|
// Otherwise queue the label and set its fragment pointer when we emit the
|
|
// next fragment.
|
|
auto *F = dyn_cast_or_null<MCDataFragment>(getCurrentFragment());
|
|
if (F && !(getAssembler().isBundlingEnabled() &&
|
|
getAssembler().getRelaxAll())) {
|
|
Symbol->setFragment(F);
|
|
Symbol->setOffset(F->getContents().size());
|
|
} else {
|
|
PendingLabels.push_back(Symbol);
|
|
}
|
|
}
|
|
|
|
void MCObjectStreamer::EmitLabel(MCSymbol *Symbol, SMLoc Loc, MCFragment *F) {
|
|
MCStreamer::EmitLabel(Symbol, Loc);
|
|
getAssembler().registerSymbol(*Symbol);
|
|
auto *DF = dyn_cast_or_null<MCDataFragment>(F);
|
|
if (DF)
|
|
Symbol->setFragment(F);
|
|
else
|
|
PendingLabels.push_back(Symbol);
|
|
}
|
|
|
|
void MCObjectStreamer::EmitULEB128Value(const MCExpr *Value) {
|
|
int64_t IntValue;
|
|
if (Value->evaluateAsAbsolute(IntValue, getAssemblerPtr())) {
|
|
EmitULEB128IntValue(IntValue);
|
|
return;
|
|
}
|
|
insert(new MCLEBFragment(*Value, false));
|
|
}
|
|
|
|
void MCObjectStreamer::EmitSLEB128Value(const MCExpr *Value) {
|
|
int64_t IntValue;
|
|
if (Value->evaluateAsAbsolute(IntValue, getAssemblerPtr())) {
|
|
EmitSLEB128IntValue(IntValue);
|
|
return;
|
|
}
|
|
insert(new MCLEBFragment(*Value, true));
|
|
}
|
|
|
|
void MCObjectStreamer::EmitWeakReference(MCSymbol *Alias,
|
|
const MCSymbol *Symbol) {
|
|
report_fatal_error("This file format doesn't support weak aliases.");
|
|
}
|
|
|
|
void MCObjectStreamer::ChangeSection(MCSection *Section,
|
|
const MCExpr *Subsection) {
|
|
changeSectionImpl(Section, Subsection);
|
|
}
|
|
|
|
bool MCObjectStreamer::changeSectionImpl(MCSection *Section,
|
|
const MCExpr *Subsection) {
|
|
assert(Section && "Cannot switch to a null section!");
|
|
flushPendingLabels(nullptr);
|
|
getContext().clearDwarfLocSeen();
|
|
|
|
bool Created = getAssembler().registerSection(*Section);
|
|
|
|
int64_t IntSubsection = 0;
|
|
if (Subsection &&
|
|
!Subsection->evaluateAsAbsolute(IntSubsection, getAssemblerPtr()))
|
|
report_fatal_error("Cannot evaluate subsection number");
|
|
if (IntSubsection < 0 || IntSubsection > 8192)
|
|
report_fatal_error("Subsection number out of range");
|
|
CurInsertionPoint =
|
|
Section->getSubsectionInsertionPoint(unsigned(IntSubsection));
|
|
return Created;
|
|
}
|
|
|
|
void MCObjectStreamer::EmitAssignment(MCSymbol *Symbol, const MCExpr *Value) {
|
|
getAssembler().registerSymbol(*Symbol);
|
|
MCStreamer::EmitAssignment(Symbol, Value);
|
|
}
|
|
|
|
bool MCObjectStreamer::mayHaveInstructions(MCSection &Sec) const {
|
|
return Sec.hasInstructions();
|
|
}
|
|
|
|
void MCObjectStreamer::EmitInstruction(const MCInst &Inst,
|
|
const MCSubtargetInfo &STI, bool) {
|
|
getAssembler().getBackend().handleCodePaddingInstructionBegin(Inst);
|
|
EmitInstructionImpl(Inst, STI);
|
|
getAssembler().getBackend().handleCodePaddingInstructionEnd(Inst);
|
|
}
|
|
|
|
void MCObjectStreamer::EmitInstructionImpl(const MCInst &Inst,
|
|
const MCSubtargetInfo &STI) {
|
|
MCStreamer::EmitInstruction(Inst, STI);
|
|
|
|
MCSection *Sec = getCurrentSectionOnly();
|
|
Sec->setHasInstructions(true);
|
|
|
|
// Now that a machine instruction has been assembled into this section, make
|
|
// a line entry for any .loc directive that has been seen.
|
|
MCDwarfLineEntry::Make(this, getCurrentSectionOnly());
|
|
|
|
// If this instruction doesn't need relaxation, just emit it as data.
|
|
MCAssembler &Assembler = getAssembler();
|
|
if (!Assembler.getBackend().mayNeedRelaxation(Inst, STI)) {
|
|
EmitInstToData(Inst, STI);
|
|
return;
|
|
}
|
|
|
|
// Otherwise, relax and emit it as data if either:
|
|
// - The RelaxAll flag was passed
|
|
// - Bundling is enabled and this instruction is inside a bundle-locked
|
|
// group. We want to emit all such instructions into the same data
|
|
// fragment.
|
|
if (Assembler.getRelaxAll() ||
|
|
(Assembler.isBundlingEnabled() && Sec->isBundleLocked())) {
|
|
MCInst Relaxed;
|
|
getAssembler().getBackend().relaxInstruction(Inst, STI, Relaxed);
|
|
while (getAssembler().getBackend().mayNeedRelaxation(Relaxed, STI))
|
|
getAssembler().getBackend().relaxInstruction(Relaxed, STI, Relaxed);
|
|
EmitInstToData(Relaxed, STI);
|
|
return;
|
|
}
|
|
|
|
// Otherwise emit to a separate fragment.
|
|
EmitInstToFragment(Inst, STI);
|
|
}
|
|
|
|
void MCObjectStreamer::EmitInstToFragment(const MCInst &Inst,
|
|
const MCSubtargetInfo &STI) {
|
|
if (getAssembler().getRelaxAll() && getAssembler().isBundlingEnabled())
|
|
llvm_unreachable("All instructions should have already been relaxed");
|
|
|
|
// Always create a new, separate fragment here, because its size can change
|
|
// during relaxation.
|
|
MCRelaxableFragment *IF = new MCRelaxableFragment(Inst, STI);
|
|
insert(IF);
|
|
|
|
SmallString<128> Code;
|
|
raw_svector_ostream VecOS(Code);
|
|
getAssembler().getEmitter().encodeInstruction(Inst, VecOS, IF->getFixups(),
|
|
STI);
|
|
IF->getContents().append(Code.begin(), Code.end());
|
|
}
|
|
|
|
#ifndef NDEBUG
|
|
static const char *const BundlingNotImplementedMsg =
|
|
"Aligned bundling is not implemented for this object format";
|
|
#endif
|
|
|
|
void MCObjectStreamer::EmitBundleAlignMode(unsigned AlignPow2) {
|
|
llvm_unreachable(BundlingNotImplementedMsg);
|
|
}
|
|
|
|
void MCObjectStreamer::EmitBundleLock(bool AlignToEnd) {
|
|
llvm_unreachable(BundlingNotImplementedMsg);
|
|
}
|
|
|
|
void MCObjectStreamer::EmitBundleUnlock() {
|
|
llvm_unreachable(BundlingNotImplementedMsg);
|
|
}
|
|
|
|
void MCObjectStreamer::EmitDwarfLocDirective(unsigned FileNo, unsigned Line,
|
|
unsigned Column, unsigned Flags,
|
|
unsigned Isa,
|
|
unsigned Discriminator,
|
|
StringRef FileName) {
|
|
// In case we see two .loc directives in a row, make sure the
|
|
// first one gets a line entry.
|
|
MCDwarfLineEntry::Make(this, getCurrentSectionOnly());
|
|
|
|
this->MCStreamer::EmitDwarfLocDirective(FileNo, Line, Column, Flags,
|
|
Isa, Discriminator, FileName);
|
|
}
|
|
|
|
static const MCExpr *buildSymbolDiff(MCObjectStreamer &OS, const MCSymbol *A,
|
|
const MCSymbol *B) {
|
|
MCContext &Context = OS.getContext();
|
|
MCSymbolRefExpr::VariantKind Variant = MCSymbolRefExpr::VK_None;
|
|
const MCExpr *ARef = MCSymbolRefExpr::create(A, Variant, Context);
|
|
const MCExpr *BRef = MCSymbolRefExpr::create(B, Variant, Context);
|
|
const MCExpr *AddrDelta =
|
|
MCBinaryExpr::create(MCBinaryExpr::Sub, ARef, BRef, Context);
|
|
return AddrDelta;
|
|
}
|
|
|
|
static void emitDwarfSetLineAddr(MCObjectStreamer &OS,
|
|
MCDwarfLineTableParams Params,
|
|
int64_t LineDelta, const MCSymbol *Label,
|
|
int PointerSize) {
|
|
// emit the sequence to set the address
|
|
OS.EmitIntValue(dwarf::DW_LNS_extended_op, 1);
|
|
OS.EmitULEB128IntValue(PointerSize + 1);
|
|
OS.EmitIntValue(dwarf::DW_LNE_set_address, 1);
|
|
OS.EmitSymbolValue(Label, PointerSize);
|
|
|
|
// emit the sequence for the LineDelta (from 1) and a zero address delta.
|
|
MCDwarfLineAddr::Emit(&OS, Params, LineDelta, 0);
|
|
}
|
|
|
|
void MCObjectStreamer::EmitDwarfAdvanceLineAddr(int64_t LineDelta,
|
|
const MCSymbol *LastLabel,
|
|
const MCSymbol *Label,
|
|
unsigned PointerSize) {
|
|
if (!LastLabel) {
|
|
emitDwarfSetLineAddr(*this, Assembler->getDWARFLinetableParams(), LineDelta,
|
|
Label, PointerSize);
|
|
return;
|
|
}
|
|
const MCExpr *AddrDelta = buildSymbolDiff(*this, Label, LastLabel);
|
|
int64_t Res;
|
|
if (AddrDelta->evaluateAsAbsolute(Res, getAssemblerPtr())) {
|
|
MCDwarfLineAddr::Emit(this, Assembler->getDWARFLinetableParams(), LineDelta,
|
|
Res);
|
|
return;
|
|
}
|
|
insert(new MCDwarfLineAddrFragment(LineDelta, *AddrDelta));
|
|
}
|
|
|
|
void MCObjectStreamer::EmitDwarfAdvanceFrameAddr(const MCSymbol *LastLabel,
|
|
const MCSymbol *Label) {
|
|
const MCExpr *AddrDelta = buildSymbolDiff(*this, Label, LastLabel);
|
|
int64_t Res;
|
|
if (AddrDelta->evaluateAsAbsolute(Res, getAssemblerPtr())) {
|
|
MCDwarfFrameEmitter::EmitAdvanceLoc(*this, Res);
|
|
return;
|
|
}
|
|
insert(new MCDwarfCallFrameFragment(*AddrDelta));
|
|
}
|
|
|
|
void MCObjectStreamer::EmitCVLocDirective(unsigned FunctionId, unsigned FileNo,
|
|
unsigned Line, unsigned Column,
|
|
bool PrologueEnd, bool IsStmt,
|
|
StringRef FileName, SMLoc Loc) {
|
|
// Validate the directive.
|
|
if (!checkCVLocSection(FunctionId, FileNo, Loc))
|
|
return;
|
|
|
|
// Emit a label at the current position and record it in the CodeViewContext.
|
|
MCSymbol *LineSym = getContext().createTempSymbol();
|
|
EmitLabel(LineSym);
|
|
getContext().getCVContext().recordCVLoc(getContext(), LineSym, FunctionId,
|
|
FileNo, Line, Column, PrologueEnd,
|
|
IsStmt);
|
|
}
|
|
|
|
void MCObjectStreamer::EmitCVLinetableDirective(unsigned FunctionId,
|
|
const MCSymbol *Begin,
|
|
const MCSymbol *End) {
|
|
getContext().getCVContext().emitLineTableForFunction(*this, FunctionId, Begin,
|
|
End);
|
|
this->MCStreamer::EmitCVLinetableDirective(FunctionId, Begin, End);
|
|
}
|
|
|
|
void MCObjectStreamer::EmitCVInlineLinetableDirective(
|
|
unsigned PrimaryFunctionId, unsigned SourceFileId, unsigned SourceLineNum,
|
|
const MCSymbol *FnStartSym, const MCSymbol *FnEndSym) {
|
|
getContext().getCVContext().emitInlineLineTableForFunction(
|
|
*this, PrimaryFunctionId, SourceFileId, SourceLineNum, FnStartSym,
|
|
FnEndSym);
|
|
this->MCStreamer::EmitCVInlineLinetableDirective(
|
|
PrimaryFunctionId, SourceFileId, SourceLineNum, FnStartSym, FnEndSym);
|
|
}
|
|
|
|
void MCObjectStreamer::EmitCVDefRangeDirective(
|
|
ArrayRef<std::pair<const MCSymbol *, const MCSymbol *>> Ranges,
|
|
StringRef FixedSizePortion) {
|
|
MCFragment *Frag =
|
|
getContext().getCVContext().emitDefRange(*this, Ranges, FixedSizePortion);
|
|
// Attach labels that were pending before we created the defrange fragment to
|
|
// the beginning of the new fragment.
|
|
flushPendingLabels(Frag, 0);
|
|
this->MCStreamer::EmitCVDefRangeDirective(Ranges, FixedSizePortion);
|
|
}
|
|
|
|
void MCObjectStreamer::EmitCVStringTableDirective() {
|
|
getContext().getCVContext().emitStringTable(*this);
|
|
}
|
|
void MCObjectStreamer::EmitCVFileChecksumsDirective() {
|
|
getContext().getCVContext().emitFileChecksums(*this);
|
|
}
|
|
|
|
void MCObjectStreamer::EmitCVFileChecksumOffsetDirective(unsigned FileNo) {
|
|
getContext().getCVContext().emitFileChecksumOffset(*this, FileNo);
|
|
}
|
|
|
|
void MCObjectStreamer::EmitBytes(StringRef Data) {
|
|
MCDwarfLineEntry::Make(this, getCurrentSectionOnly());
|
|
MCDataFragment *DF = getOrCreateDataFragment();
|
|
flushPendingLabels(DF, DF->getContents().size());
|
|
DF->getContents().append(Data.begin(), Data.end());
|
|
|
|
// EmitBytes might not cover all possible ways we emit data (or could be used
|
|
// to emit executable code in some cases), but is the best method we have
|
|
// right now for checking this.
|
|
MCSection *Sec = getCurrentSectionOnly();
|
|
Sec->setHasData(true);
|
|
}
|
|
|
|
void MCObjectStreamer::EmitValueToAlignment(unsigned ByteAlignment,
|
|
int64_t Value,
|
|
unsigned ValueSize,
|
|
unsigned MaxBytesToEmit) {
|
|
if (MaxBytesToEmit == 0)
|
|
MaxBytesToEmit = ByteAlignment;
|
|
insert(new MCAlignFragment(ByteAlignment, Value, ValueSize, MaxBytesToEmit));
|
|
|
|
// Update the maximum alignment on the current section if necessary.
|
|
MCSection *CurSec = getCurrentSectionOnly();
|
|
if (ByteAlignment > CurSec->getAlignment())
|
|
CurSec->setAlignment(ByteAlignment);
|
|
}
|
|
|
|
void MCObjectStreamer::EmitCodeAlignment(unsigned ByteAlignment,
|
|
unsigned MaxBytesToEmit) {
|
|
EmitValueToAlignment(ByteAlignment, 0, 1, MaxBytesToEmit);
|
|
cast<MCAlignFragment>(getCurrentFragment())->setEmitNops(true);
|
|
}
|
|
|
|
void MCObjectStreamer::emitValueToOffset(const MCExpr *Offset,
|
|
unsigned char Value,
|
|
SMLoc Loc) {
|
|
insert(new MCOrgFragment(*Offset, Value, Loc));
|
|
}
|
|
|
|
void MCObjectStreamer::EmitCodePaddingBasicBlockStart(
|
|
const MCCodePaddingContext &Context) {
|
|
getAssembler().getBackend().handleCodePaddingBasicBlockStart(this, Context);
|
|
}
|
|
|
|
void MCObjectStreamer::EmitCodePaddingBasicBlockEnd(
|
|
const MCCodePaddingContext &Context) {
|
|
getAssembler().getBackend().handleCodePaddingBasicBlockEnd(Context);
|
|
}
|
|
|
|
// Associate DTPRel32 fixup with data and resize data area
|
|
void MCObjectStreamer::EmitDTPRel32Value(const MCExpr *Value) {
|
|
MCDataFragment *DF = getOrCreateDataFragment();
|
|
flushPendingLabels(DF, DF->getContents().size());
|
|
|
|
DF->getFixups().push_back(MCFixup::create(DF->getContents().size(),
|
|
Value, FK_DTPRel_4));
|
|
DF->getContents().resize(DF->getContents().size() + 4, 0);
|
|
}
|
|
|
|
// Associate DTPRel64 fixup with data and resize data area
|
|
void MCObjectStreamer::EmitDTPRel64Value(const MCExpr *Value) {
|
|
MCDataFragment *DF = getOrCreateDataFragment();
|
|
flushPendingLabels(DF, DF->getContents().size());
|
|
|
|
DF->getFixups().push_back(MCFixup::create(DF->getContents().size(),
|
|
Value, FK_DTPRel_8));
|
|
DF->getContents().resize(DF->getContents().size() + 8, 0);
|
|
}
|
|
|
|
// Associate TPRel32 fixup with data and resize data area
|
|
void MCObjectStreamer::EmitTPRel32Value(const MCExpr *Value) {
|
|
MCDataFragment *DF = getOrCreateDataFragment();
|
|
flushPendingLabels(DF, DF->getContents().size());
|
|
|
|
DF->getFixups().push_back(MCFixup::create(DF->getContents().size(),
|
|
Value, FK_TPRel_4));
|
|
DF->getContents().resize(DF->getContents().size() + 4, 0);
|
|
}
|
|
|
|
// Associate TPRel64 fixup with data and resize data area
|
|
void MCObjectStreamer::EmitTPRel64Value(const MCExpr *Value) {
|
|
MCDataFragment *DF = getOrCreateDataFragment();
|
|
flushPendingLabels(DF, DF->getContents().size());
|
|
|
|
DF->getFixups().push_back(MCFixup::create(DF->getContents().size(),
|
|
Value, FK_TPRel_8));
|
|
DF->getContents().resize(DF->getContents().size() + 8, 0);
|
|
}
|
|
|
|
// Associate GPRel32 fixup with data and resize data area
|
|
void MCObjectStreamer::EmitGPRel32Value(const MCExpr *Value) {
|
|
MCDataFragment *DF = getOrCreateDataFragment();
|
|
flushPendingLabels(DF, DF->getContents().size());
|
|
|
|
DF->getFixups().push_back(
|
|
MCFixup::create(DF->getContents().size(), Value, FK_GPRel_4));
|
|
DF->getContents().resize(DF->getContents().size() + 4, 0);
|
|
}
|
|
|
|
// Associate GPRel64 fixup with data and resize data area
|
|
void MCObjectStreamer::EmitGPRel64Value(const MCExpr *Value) {
|
|
MCDataFragment *DF = getOrCreateDataFragment();
|
|
flushPendingLabels(DF, DF->getContents().size());
|
|
|
|
DF->getFixups().push_back(
|
|
MCFixup::create(DF->getContents().size(), Value, FK_GPRel_4));
|
|
DF->getContents().resize(DF->getContents().size() + 8, 0);
|
|
}
|
|
|
|
bool MCObjectStreamer::EmitRelocDirective(const MCExpr &Offset, StringRef Name,
|
|
const MCExpr *Expr, SMLoc Loc,
|
|
const MCSubtargetInfo &STI) {
|
|
Optional<MCFixupKind> MaybeKind = Assembler->getBackend().getFixupKind(Name);
|
|
if (!MaybeKind.hasValue())
|
|
return true;
|
|
|
|
MCFixupKind Kind = *MaybeKind;
|
|
|
|
if (Expr == nullptr)
|
|
Expr =
|
|
MCSymbolRefExpr::create(getContext().createTempSymbol(), getContext());
|
|
|
|
MCDataFragment *DF = getOrCreateDataFragment(&STI);
|
|
flushPendingLabels(DF, DF->getContents().size());
|
|
|
|
int64_t OffsetValue;
|
|
if (Offset.evaluateAsAbsolute(OffsetValue)) {
|
|
if (OffsetValue < 0)
|
|
llvm_unreachable(".reloc offset is negative");
|
|
DF->getFixups().push_back(MCFixup::create(OffsetValue, Expr, Kind, Loc));
|
|
return false;
|
|
}
|
|
|
|
if (Offset.getKind() != llvm::MCExpr::SymbolRef)
|
|
llvm_unreachable(".reloc offset is not absolute nor a label");
|
|
|
|
const MCSymbolRefExpr &SRE = cast<MCSymbolRefExpr>(Offset);
|
|
if (SRE.getSymbol().isDefined()) {
|
|
DF->getFixups().push_back(MCFixup::create(SRE.getSymbol().getOffset(),
|
|
Expr, Kind, Loc));
|
|
return false;
|
|
}
|
|
|
|
PendingFixups.emplace_back(&SRE.getSymbol(), DF,
|
|
MCFixup::create(-1, Expr, Kind, Loc));
|
|
return false;
|
|
}
|
|
|
|
void MCObjectStreamer::emitFill(const MCExpr &NumBytes, uint64_t FillValue,
|
|
SMLoc Loc) {
|
|
MCDataFragment *DF = getOrCreateDataFragment();
|
|
flushPendingLabels(DF, DF->getContents().size());
|
|
|
|
assert(getCurrentSectionOnly() && "need a section");
|
|
insert(new MCFillFragment(FillValue, 1, NumBytes, Loc));
|
|
}
|
|
|
|
void MCObjectStreamer::emitFill(const MCExpr &NumValues, int64_t Size,
|
|
int64_t Expr, SMLoc Loc) {
|
|
int64_t IntNumValues;
|
|
// Do additional checking now if we can resolve the value.
|
|
if (NumValues.evaluateAsAbsolute(IntNumValues, getAssemblerPtr())) {
|
|
if (IntNumValues < 0) {
|
|
getContext().getSourceManager()->PrintMessage(
|
|
Loc, SourceMgr::DK_Warning,
|
|
"'.fill' directive with negative repeat count has no effect");
|
|
return;
|
|
}
|
|
// Emit now if we can for better errors.
|
|
int64_t NonZeroSize = Size > 4 ? 4 : Size;
|
|
Expr &= ~0ULL >> (64 - NonZeroSize * 8);
|
|
for (uint64_t i = 0, e = IntNumValues; i != e; ++i) {
|
|
EmitIntValue(Expr, NonZeroSize);
|
|
if (NonZeroSize < Size)
|
|
EmitIntValue(0, Size - NonZeroSize);
|
|
}
|
|
return;
|
|
}
|
|
|
|
// Otherwise emit as fragment.
|
|
MCDataFragment *DF = getOrCreateDataFragment();
|
|
flushPendingLabels(DF, DF->getContents().size());
|
|
|
|
assert(getCurrentSectionOnly() && "need a section");
|
|
insert(new MCFillFragment(Expr, Size, NumValues, Loc));
|
|
}
|
|
|
|
void MCObjectStreamer::EmitFileDirective(StringRef Filename) {
|
|
getAssembler().addFileName(Filename);
|
|
}
|
|
|
|
void MCObjectStreamer::EmitAddrsig() {
|
|
getAssembler().getWriter().emitAddrsigSection();
|
|
}
|
|
|
|
void MCObjectStreamer::EmitAddrsigSym(const MCSymbol *Sym) {
|
|
getAssembler().registerSymbol(*Sym);
|
|
getAssembler().getWriter().addAddrsigSymbol(Sym);
|
|
}
|
|
|
|
void MCObjectStreamer::FinishImpl() {
|
|
getContext().RemapDebugPaths();
|
|
|
|
// If we are generating dwarf for assembly source files dump out the sections.
|
|
if (getContext().getGenDwarfForAssembly())
|
|
MCGenDwarfInfo::Emit(this);
|
|
|
|
// Dump out the dwarf file & directory tables and line tables.
|
|
MCDwarfLineTable::Emit(this, getAssembler().getDWARFLinetableParams());
|
|
|
|
flushPendingLabels();
|
|
resolvePendingFixups();
|
|
getAssembler().Finish();
|
|
}
|