forked from OSchip/llvm-project
864 lines
32 KiB
C++
864 lines
32 KiB
C++
//===- lib/MC/MCObjectStreamer.cpp - Object File MCStreamer Interface -----===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/MC/MCObjectStreamer.h"
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#include "llvm/ADT/STLExtras.h"
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#include "llvm/MC/MCAsmBackend.h"
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#include "llvm/MC/MCAssembler.h"
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#include "llvm/MC/MCCodeEmitter.h"
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#include "llvm/MC/MCCodeView.h"
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#include "llvm/MC/MCContext.h"
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#include "llvm/MC/MCDwarf.h"
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#include "llvm/MC/MCExpr.h"
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#include "llvm/MC/MCObjectWriter.h"
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#include "llvm/MC/MCSection.h"
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#include "llvm/MC/MCSymbol.h"
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#include "llvm/MC/MCValue.h"
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#include "llvm/Support/ErrorHandling.h"
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#include "llvm/Support/SourceMgr.h"
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using namespace llvm;
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MCObjectStreamer::MCObjectStreamer(MCContext &Context,
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std::unique_ptr<MCAsmBackend> TAB,
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std::unique_ptr<MCObjectWriter> OW,
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std::unique_ptr<MCCodeEmitter> Emitter)
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: MCStreamer(Context),
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Assembler(std::make_unique<MCAssembler>(
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Context, std::move(TAB), std::move(Emitter), std::move(OW))),
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EmitEHFrame(true), EmitDebugFrame(false) {
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if (Assembler->getBackendPtr())
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setAllowAutoPadding(Assembler->getBackend().allowAutoPadding());
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}
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MCObjectStreamer::~MCObjectStreamer() {}
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// AssemblerPtr is used for evaluation of expressions and causes
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// difference between asm and object outputs. Return nullptr to in
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// inline asm mode to limit divergence to assembly inputs.
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MCAssembler *MCObjectStreamer::getAssemblerPtr() {
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if (getUseAssemblerInfoForParsing())
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return Assembler.get();
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return nullptr;
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}
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void MCObjectStreamer::addPendingLabel(MCSymbol* S) {
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MCSection *CurSection = getCurrentSectionOnly();
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if (CurSection) {
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// Register labels that have not yet been assigned to a Section.
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if (!PendingLabels.empty()) {
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for (MCSymbol* Sym : PendingLabels)
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CurSection->addPendingLabel(Sym);
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PendingLabels.clear();
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}
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// Add this label to the current Section / Subsection.
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CurSection->addPendingLabel(S, CurSubsectionIdx);
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// Add this Section to the list of PendingLabelSections.
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PendingLabelSections.insert(CurSection);
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} else
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// There is no Section / Subsection for this label yet.
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PendingLabels.push_back(S);
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}
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void MCObjectStreamer::flushPendingLabels(MCFragment *F, uint64_t FOffset) {
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MCSection *CurSection = getCurrentSectionOnly();
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if (!CurSection) {
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assert(PendingLabels.empty());
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return;
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}
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// Register labels that have not yet been assigned to a Section.
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if (!PendingLabels.empty()) {
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for (MCSymbol* Sym : PendingLabels)
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CurSection->addPendingLabel(Sym, CurSubsectionIdx);
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PendingLabels.clear();
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}
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// Associate a fragment with this label, either the supplied fragment
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// or an empty data fragment.
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if (F)
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CurSection->flushPendingLabels(F, FOffset, CurSubsectionIdx);
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else
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CurSection->flushPendingLabels(nullptr, 0, CurSubsectionIdx);
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}
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void MCObjectStreamer::flushPendingLabels() {
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// Register labels that have not yet been assigned to a Section.
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if (!PendingLabels.empty()) {
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MCSection *CurSection = getCurrentSectionOnly();
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assert(CurSection);
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for (MCSymbol* Sym : PendingLabels)
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CurSection->addPendingLabel(Sym, CurSubsectionIdx);
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PendingLabels.clear();
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}
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// Assign an empty data fragment to all remaining pending labels.
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for (MCSection* Section : PendingLabelSections)
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Section->flushPendingLabels();
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}
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// When fixup's offset is a forward declared label, e.g.:
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//
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// .reloc 1f, R_MIPS_JALR, foo
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// 1: nop
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//
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// postpone adding it to Fixups vector until the label is defined and its offset
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// is known.
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void MCObjectStreamer::resolvePendingFixups() {
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for (PendingMCFixup &PendingFixup : PendingFixups) {
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if (!PendingFixup.Sym || PendingFixup.Sym->isUndefined ()) {
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getContext().reportError(PendingFixup.Fixup.getLoc(),
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"unresolved relocation offset");
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continue;
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}
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flushPendingLabels(PendingFixup.DF, PendingFixup.DF->getContents().size());
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PendingFixup.Fixup.setOffset(PendingFixup.Sym->getOffset());
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PendingFixup.DF->getFixups().push_back(PendingFixup.Fixup);
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}
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PendingFixups.clear();
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}
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// As a compile-time optimization, avoid allocating and evaluating an MCExpr
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// tree for (Hi - Lo) when Hi and Lo are offsets into the same fragment.
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static Optional<uint64_t>
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absoluteSymbolDiff(MCAssembler &Asm, const MCSymbol *Hi, const MCSymbol *Lo) {
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assert(Hi && Lo);
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if (Asm.getBackendPtr()->requiresDiffExpressionRelocations())
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return None;
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if (!Hi->getFragment() || Hi->getFragment() != Lo->getFragment() ||
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Hi->isVariable() || Lo->isVariable())
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return None;
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return Hi->getOffset() - Lo->getOffset();
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}
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void MCObjectStreamer::emitAbsoluteSymbolDiff(const MCSymbol *Hi,
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const MCSymbol *Lo,
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unsigned Size) {
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if (Optional<uint64_t> Diff = absoluteSymbolDiff(getAssembler(), Hi, Lo)) {
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emitIntValue(*Diff, Size);
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return;
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}
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MCStreamer::emitAbsoluteSymbolDiff(Hi, Lo, Size);
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}
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void MCObjectStreamer::emitAbsoluteSymbolDiffAsULEB128(const MCSymbol *Hi,
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const MCSymbol *Lo) {
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if (Optional<uint64_t> Diff = absoluteSymbolDiff(getAssembler(), Hi, Lo)) {
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emitULEB128IntValue(*Diff);
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return;
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}
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MCStreamer::emitAbsoluteSymbolDiffAsULEB128(Hi, Lo);
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}
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void MCObjectStreamer::reset() {
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if (Assembler)
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Assembler->reset();
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CurInsertionPoint = MCSection::iterator();
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EmitEHFrame = true;
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EmitDebugFrame = false;
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PendingLabels.clear();
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PendingLabelSections.clear();
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MCStreamer::reset();
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}
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void MCObjectStreamer::emitFrames(MCAsmBackend *MAB) {
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if (!getNumFrameInfos())
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return;
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if (EmitEHFrame)
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MCDwarfFrameEmitter::Emit(*this, MAB, true);
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if (EmitDebugFrame)
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MCDwarfFrameEmitter::Emit(*this, MAB, false);
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}
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MCFragment *MCObjectStreamer::getCurrentFragment() const {
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assert(getCurrentSectionOnly() && "No current section!");
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if (CurInsertionPoint != getCurrentSectionOnly()->getFragmentList().begin())
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return &*std::prev(CurInsertionPoint);
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return nullptr;
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}
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static bool canReuseDataFragment(const MCDataFragment &F,
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const MCAssembler &Assembler,
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const MCSubtargetInfo *STI) {
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if (!F.hasInstructions())
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return true;
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// When bundling is enabled, we don't want to add data to a fragment that
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// already has instructions (see MCELFStreamer::emitInstToData for details)
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if (Assembler.isBundlingEnabled())
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return Assembler.getRelaxAll();
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// If the subtarget is changed mid fragment we start a new fragment to record
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// the new STI.
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return !STI || F.getSubtargetInfo() == STI;
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}
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MCDataFragment *
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MCObjectStreamer::getOrCreateDataFragment(const MCSubtargetInfo *STI) {
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MCDataFragment *F = dyn_cast_or_null<MCDataFragment>(getCurrentFragment());
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if (!F || !canReuseDataFragment(*F, *Assembler, STI)) {
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F = new MCDataFragment();
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insert(F);
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}
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return F;
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}
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void MCObjectStreamer::visitUsedSymbol(const MCSymbol &Sym) {
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Assembler->registerSymbol(Sym);
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}
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void MCObjectStreamer::emitCFISections(bool EH, bool Debug) {
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MCStreamer::emitCFISections(EH, Debug);
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EmitEHFrame = EH;
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EmitDebugFrame = Debug;
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}
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void MCObjectStreamer::emitValueImpl(const MCExpr *Value, unsigned Size,
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SMLoc Loc) {
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MCStreamer::emitValueImpl(Value, Size, Loc);
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MCDataFragment *DF = getOrCreateDataFragment();
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flushPendingLabels(DF, DF->getContents().size());
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MCDwarfLineEntry::Make(this, getCurrentSectionOnly());
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// Avoid fixups when possible.
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int64_t AbsValue;
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if (Value->evaluateAsAbsolute(AbsValue, getAssemblerPtr())) {
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if (!isUIntN(8 * Size, AbsValue) && !isIntN(8 * Size, AbsValue)) {
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getContext().reportError(
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Loc, "value evaluated as " + Twine(AbsValue) + " is out of range.");
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return;
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}
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emitIntValue(AbsValue, Size);
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return;
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}
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DF->getFixups().push_back(
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MCFixup::create(DF->getContents().size(), Value,
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MCFixup::getKindForSize(Size, false), Loc));
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DF->getContents().resize(DF->getContents().size() + Size, 0);
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}
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MCSymbol *MCObjectStreamer::emitCFILabel() {
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MCSymbol *Label = getContext().createTempSymbol("cfi");
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emitLabel(Label);
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return Label;
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}
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void MCObjectStreamer::emitCFIStartProcImpl(MCDwarfFrameInfo &Frame) {
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// We need to create a local symbol to avoid relocations.
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Frame.Begin = getContext().createTempSymbol();
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emitLabel(Frame.Begin);
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}
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void MCObjectStreamer::emitCFIEndProcImpl(MCDwarfFrameInfo &Frame) {
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Frame.End = getContext().createTempSymbol();
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emitLabel(Frame.End);
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}
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void MCObjectStreamer::emitLabel(MCSymbol *Symbol, SMLoc Loc) {
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MCStreamer::emitLabel(Symbol, Loc);
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getAssembler().registerSymbol(*Symbol);
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// If there is a current fragment, mark the symbol as pointing into it.
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// Otherwise queue the label and set its fragment pointer when we emit the
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// next fragment.
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auto *F = dyn_cast_or_null<MCDataFragment>(getCurrentFragment());
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if (F && !(getAssembler().isBundlingEnabled() &&
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getAssembler().getRelaxAll())) {
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Symbol->setFragment(F);
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Symbol->setOffset(F->getContents().size());
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} else {
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// Assign all pending labels to offset 0 within the dummy "pending"
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// fragment. (They will all be reassigned to a real fragment in
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// flushPendingLabels())
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Symbol->setOffset(0);
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addPendingLabel(Symbol);
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}
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}
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// Emit a label at a previously emitted fragment/offset position. This must be
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// within the currently-active section.
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void MCObjectStreamer::emitLabelAtPos(MCSymbol *Symbol, SMLoc Loc,
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MCFragment *F, uint64_t Offset) {
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assert(F->getParent() == getCurrentSectionOnly());
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MCStreamer::emitLabel(Symbol, Loc);
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getAssembler().registerSymbol(*Symbol);
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auto *DF = dyn_cast_or_null<MCDataFragment>(F);
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Symbol->setOffset(Offset);
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if (DF) {
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Symbol->setFragment(F);
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} else {
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assert(isa<MCDummyFragment>(F) &&
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"F must either be an MCDataFragment or the pending MCDummyFragment");
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assert(Offset == 0);
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addPendingLabel(Symbol);
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}
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}
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void MCObjectStreamer::emitULEB128Value(const MCExpr *Value) {
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int64_t IntValue;
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if (Value->evaluateAsAbsolute(IntValue, getAssemblerPtr())) {
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emitULEB128IntValue(IntValue);
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return;
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}
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insert(new MCLEBFragment(*Value, false));
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}
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void MCObjectStreamer::emitSLEB128Value(const MCExpr *Value) {
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int64_t IntValue;
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if (Value->evaluateAsAbsolute(IntValue, getAssemblerPtr())) {
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emitSLEB128IntValue(IntValue);
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return;
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}
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insert(new MCLEBFragment(*Value, true));
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}
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void MCObjectStreamer::emitWeakReference(MCSymbol *Alias,
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const MCSymbol *Symbol) {
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report_fatal_error("This file format doesn't support weak aliases.");
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}
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void MCObjectStreamer::changeSection(MCSection *Section,
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const MCExpr *Subsection) {
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changeSectionImpl(Section, Subsection);
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}
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bool MCObjectStreamer::changeSectionImpl(MCSection *Section,
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const MCExpr *Subsection) {
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assert(Section && "Cannot switch to a null section!");
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getContext().clearDwarfLocSeen();
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bool Created = getAssembler().registerSection(*Section);
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int64_t IntSubsection = 0;
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if (Subsection &&
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!Subsection->evaluateAsAbsolute(IntSubsection, getAssemblerPtr()))
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report_fatal_error("Cannot evaluate subsection number");
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if (IntSubsection < 0 || IntSubsection > 8192)
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report_fatal_error("Subsection number out of range");
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CurSubsectionIdx = unsigned(IntSubsection);
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CurInsertionPoint =
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Section->getSubsectionInsertionPoint(CurSubsectionIdx);
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return Created;
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}
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void MCObjectStreamer::emitAssignment(MCSymbol *Symbol, const MCExpr *Value) {
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getAssembler().registerSymbol(*Symbol);
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MCStreamer::emitAssignment(Symbol, Value);
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}
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bool MCObjectStreamer::mayHaveInstructions(MCSection &Sec) const {
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return Sec.hasInstructions();
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}
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void MCObjectStreamer::emitInstruction(const MCInst &Inst,
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const MCSubtargetInfo &STI) {
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const MCSection &Sec = *getCurrentSectionOnly();
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if (Sec.isVirtualSection()) {
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getContext().reportError(Inst.getLoc(), Twine(Sec.getVirtualSectionKind()) +
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" section '" + Sec.getName() +
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"' cannot have instructions");
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return;
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}
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getAssembler().getBackend().emitInstructionBegin(*this, Inst);
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emitInstructionImpl(Inst, STI);
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getAssembler().getBackend().emitInstructionEnd(*this, Inst);
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}
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void MCObjectStreamer::emitInstructionImpl(const MCInst &Inst,
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const MCSubtargetInfo &STI) {
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MCStreamer::emitInstruction(Inst, STI);
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MCSection *Sec = getCurrentSectionOnly();
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Sec->setHasInstructions(true);
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// Now that a machine instruction has been assembled into this section, make
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// a line entry for any .loc directive that has been seen.
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MCDwarfLineEntry::Make(this, getCurrentSectionOnly());
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// If this instruction doesn't need relaxation, just emit it as data.
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MCAssembler &Assembler = getAssembler();
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MCAsmBackend &Backend = Assembler.getBackend();
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if (!(Backend.mayNeedRelaxation(Inst, STI) ||
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Backend.allowEnhancedRelaxation())) {
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emitInstToData(Inst, STI);
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return;
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}
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// Otherwise, relax and emit it as data if either:
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// - The RelaxAll flag was passed
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// - Bundling is enabled and this instruction is inside a bundle-locked
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// group. We want to emit all such instructions into the same data
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// fragment.
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if (Assembler.getRelaxAll() ||
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(Assembler.isBundlingEnabled() && Sec->isBundleLocked())) {
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MCInst Relaxed = Inst;
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while (Backend.mayNeedRelaxation(Relaxed, STI))
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Backend.relaxInstruction(Relaxed, STI);
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emitInstToData(Relaxed, STI);
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return;
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}
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// Otherwise emit to a separate fragment.
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emitInstToFragment(Inst, STI);
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}
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void MCObjectStreamer::emitInstToFragment(const MCInst &Inst,
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const MCSubtargetInfo &STI) {
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if (getAssembler().getRelaxAll() && getAssembler().isBundlingEnabled())
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llvm_unreachable("All instructions should have already been relaxed");
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// Always create a new, separate fragment here, because its size can change
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// during relaxation.
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MCRelaxableFragment *IF = new MCRelaxableFragment(Inst, STI);
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insert(IF);
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SmallString<128> Code;
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raw_svector_ostream VecOS(Code);
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getAssembler().getEmitter().encodeInstruction(Inst, VecOS, IF->getFixups(),
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STI);
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IF->getContents().append(Code.begin(), Code.end());
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}
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#ifndef NDEBUG
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static const char *const BundlingNotImplementedMsg =
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"Aligned bundling is not implemented for this object format";
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#endif
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void MCObjectStreamer::emitBundleAlignMode(unsigned AlignPow2) {
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llvm_unreachable(BundlingNotImplementedMsg);
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}
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void MCObjectStreamer::emitBundleLock(bool AlignToEnd) {
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llvm_unreachable(BundlingNotImplementedMsg);
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}
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void MCObjectStreamer::emitBundleUnlock() {
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llvm_unreachable(BundlingNotImplementedMsg);
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}
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void MCObjectStreamer::emitDwarfLocDirective(unsigned FileNo, unsigned Line,
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unsigned Column, unsigned Flags,
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unsigned Isa,
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unsigned Discriminator,
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StringRef FileName) {
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// In case we see two .loc directives in a row, make sure the
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// first one gets a line entry.
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MCDwarfLineEntry::Make(this, getCurrentSectionOnly());
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this->MCStreamer::emitDwarfLocDirective(FileNo, Line, Column, Flags, Isa,
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Discriminator, FileName);
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}
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static const MCExpr *buildSymbolDiff(MCObjectStreamer &OS, const MCSymbol *A,
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const MCSymbol *B) {
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MCContext &Context = OS.getContext();
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MCSymbolRefExpr::VariantKind Variant = MCSymbolRefExpr::VK_None;
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const MCExpr *ARef = MCSymbolRefExpr::create(A, Variant, Context);
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const MCExpr *BRef = MCSymbolRefExpr::create(B, Variant, Context);
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const MCExpr *AddrDelta =
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MCBinaryExpr::create(MCBinaryExpr::Sub, ARef, BRef, Context);
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return AddrDelta;
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}
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static void emitDwarfSetLineAddr(MCObjectStreamer &OS,
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MCDwarfLineTableParams Params,
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int64_t LineDelta, const MCSymbol *Label,
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int PointerSize) {
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// emit the sequence to set the address
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OS.emitIntValue(dwarf::DW_LNS_extended_op, 1);
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OS.emitULEB128IntValue(PointerSize + 1);
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OS.emitIntValue(dwarf::DW_LNE_set_address, 1);
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OS.emitSymbolValue(Label, PointerSize);
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// emit the sequence for the LineDelta (from 1) and a zero address delta.
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|
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());
|
|
}
|
|
|
|
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(Align(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));
|
|
}
|
|
|
|
// 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);
|
|
}
|
|
|
|
static Optional<std::pair<bool, std::string>>
|
|
getOffsetAndDataFragment(const MCSymbol &Symbol, uint32_t &RelocOffset,
|
|
MCDataFragment *&DF) {
|
|
if (Symbol.isVariable()) {
|
|
const MCExpr *SymbolExpr = Symbol.getVariableValue();
|
|
MCValue OffsetVal;
|
|
if(!SymbolExpr->evaluateAsRelocatable(OffsetVal, nullptr, nullptr))
|
|
return std::make_pair(false,
|
|
std::string("symbol in .reloc offset is not "
|
|
"relocatable"));
|
|
if (OffsetVal.isAbsolute()) {
|
|
RelocOffset = OffsetVal.getConstant();
|
|
MCFragment *Fragment = Symbol.getFragment();
|
|
// FIXME Support symbols with no DF. For example:
|
|
// .reloc .data, ENUM_VALUE, <some expr>
|
|
if (!Fragment || Fragment->getKind() != MCFragment::FT_Data)
|
|
return std::make_pair(false,
|
|
std::string("symbol in offset has no data "
|
|
"fragment"));
|
|
DF = cast<MCDataFragment>(Fragment);
|
|
return None;
|
|
}
|
|
|
|
if (OffsetVal.getSymB())
|
|
return std::make_pair(false,
|
|
std::string(".reloc symbol offset is not "
|
|
"representable"));
|
|
|
|
const MCSymbolRefExpr &SRE = cast<MCSymbolRefExpr>(*OffsetVal.getSymA());
|
|
if (!SRE.getSymbol().isDefined())
|
|
return std::make_pair(false,
|
|
std::string("symbol used in the .reloc offset is "
|
|
"not defined"));
|
|
|
|
if (SRE.getSymbol().isVariable())
|
|
return std::make_pair(false,
|
|
std::string("symbol used in the .reloc offset is "
|
|
"variable"));
|
|
|
|
MCFragment *Fragment = SRE.getSymbol().getFragment();
|
|
// FIXME Support symbols with no DF. For example:
|
|
// .reloc .data, ENUM_VALUE, <some expr>
|
|
if (!Fragment || Fragment->getKind() != MCFragment::FT_Data)
|
|
return std::make_pair(false,
|
|
std::string("symbol in offset has no data "
|
|
"fragment"));
|
|
RelocOffset = SRE.getSymbol().getOffset() + OffsetVal.getConstant();
|
|
DF = cast<MCDataFragment>(Fragment);
|
|
} else {
|
|
RelocOffset = Symbol.getOffset();
|
|
MCFragment *Fragment = Symbol.getFragment();
|
|
// FIXME Support symbols with no DF. For example:
|
|
// .reloc .data, ENUM_VALUE, <some expr>
|
|
if (!Fragment || Fragment->getKind() != MCFragment::FT_Data)
|
|
return std::make_pair(false,
|
|
std::string("symbol in offset has no data "
|
|
"fragment"));
|
|
DF = cast<MCDataFragment>(Fragment);
|
|
}
|
|
return None;
|
|
}
|
|
|
|
Optional<std::pair<bool, std::string>>
|
|
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 std::make_pair(true, std::string("unknown relocation name"));
|
|
|
|
MCFixupKind Kind = *MaybeKind;
|
|
|
|
if (Expr == nullptr)
|
|
Expr =
|
|
MCSymbolRefExpr::create(getContext().createTempSymbol(), getContext());
|
|
|
|
MCDataFragment *DF = getOrCreateDataFragment(&STI);
|
|
flushPendingLabels(DF, DF->getContents().size());
|
|
|
|
MCValue OffsetVal;
|
|
if (!Offset.evaluateAsRelocatable(OffsetVal, nullptr, nullptr))
|
|
return std::make_pair(false,
|
|
std::string(".reloc offset is not relocatable"));
|
|
if (OffsetVal.isAbsolute()) {
|
|
if (OffsetVal.getConstant() < 0)
|
|
return std::make_pair(false, std::string(".reloc offset is negative"));
|
|
DF->getFixups().push_back(
|
|
MCFixup::create(OffsetVal.getConstant(), Expr, Kind, Loc));
|
|
return None;
|
|
}
|
|
if (OffsetVal.getSymB())
|
|
return std::make_pair(false,
|
|
std::string(".reloc offset is not representable"));
|
|
|
|
const MCSymbolRefExpr &SRE = cast<MCSymbolRefExpr>(*OffsetVal.getSymA());
|
|
const MCSymbol &Symbol = SRE.getSymbol();
|
|
if (Symbol.isDefined()) {
|
|
uint32_t SymbolOffset = 0;
|
|
Optional<std::pair<bool, std::string>> Error;
|
|
Error = getOffsetAndDataFragment(Symbol, SymbolOffset, DF);
|
|
|
|
if (Error != None)
|
|
return Error;
|
|
|
|
DF->getFixups().push_back(
|
|
MCFixup::create(SymbolOffset + OffsetVal.getConstant(),
|
|
Expr, Kind, Loc));
|
|
return None;
|
|
}
|
|
|
|
PendingFixups.emplace_back(&SRE.getSymbol(), DF,
|
|
MCFixup::create(-1, Expr, Kind, Loc));
|
|
return None;
|
|
}
|
|
|
|
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::emitNops(int64_t NumBytes, int64_t ControlledNopLength,
|
|
SMLoc Loc) {
|
|
// Emit an NOP fragment.
|
|
MCDataFragment *DF = getOrCreateDataFragment();
|
|
flushPendingLabels(DF, DF->getContents().size());
|
|
|
|
assert(getCurrentSectionOnly() && "need a section");
|
|
insert(new MCNopsFragment(NumBytes, ControlledNopLength, 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());
|
|
|
|
// Emit pseudo probes for the current module.
|
|
MCPseudoProbeTable::emit(this);
|
|
|
|
// Update any remaining pending labels with empty data fragments.
|
|
flushPendingLabels();
|
|
|
|
resolvePendingFixups();
|
|
getAssembler().Finish();
|
|
}
|