2010-06-16 20:04:22 +00:00
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//===- lib/MC/MCObjectStreamer.cpp - Object File MCStreamer Interface -----===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/MC/MCObjectStreamer.h"
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2013-04-17 21:18:16 +00:00
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#include "llvm/ADT/STLExtras.h"
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2012-03-26 06:58:25 +00:00
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#include "llvm/MC/MCAsmBackend.h"
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#include "llvm/MC/MCAsmInfo.h"
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2010-06-16 20:04:22 +00:00
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#include "llvm/MC/MCAssembler.h"
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2010-07-29 17:48:06 +00:00
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#include "llvm/MC/MCCodeEmitter.h"
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2010-12-10 07:39:47 +00:00
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#include "llvm/MC/MCContext.h"
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2010-11-01 16:27:31 +00:00
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#include "llvm/MC/MCDwarf.h"
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2010-07-19 06:13:10 +00:00
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#include "llvm/MC/MCExpr.h"
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2012-03-26 06:58:25 +00:00
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#include "llvm/MC/MCObjectWriter.h"
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2013-06-27 14:35:03 +00:00
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#include "llvm/MC/MCSection.h"
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2014-01-07 11:48:04 +00:00
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#include "llvm/MC/MCSymbol.h"
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2012-03-26 06:58:25 +00:00
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#include "llvm/Support/ErrorHandling.h"
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2015-03-18 19:08:20 +00:00
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#include "llvm/Support/TargetRegistry.h"
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2010-06-16 20:04:22 +00:00
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using namespace llvm;
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2014-01-26 06:06:37 +00:00
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MCObjectStreamer::MCObjectStreamer(MCContext &Context, MCAsmBackend &TAB,
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2015-04-14 22:14:34 +00:00
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raw_pwrite_stream &OS,
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MCCodeEmitter *Emitter_)
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2014-01-26 06:06:37 +00:00
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: MCStreamer(Context),
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2013-01-31 23:29:57 +00:00
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Assembler(new MCAssembler(Context, TAB, *Emitter_,
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*TAB.createObjectWriter(OS), OS)),
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2015-05-27 20:52:32 +00:00
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EmitEHFrame(true), EmitDebugFrame(false) {}
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2010-06-16 20:04:22 +00:00
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MCObjectStreamer::~MCObjectStreamer() {
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2010-07-29 17:48:06 +00:00
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delete &Assembler->getBackend();
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delete &Assembler->getEmitter();
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2010-12-17 02:45:41 +00:00
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delete &Assembler->getWriter();
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2010-06-16 20:04:22 +00:00
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delete Assembler;
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}
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2010-06-16 20:04:25 +00:00
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2015-04-12 23:42:25 +00:00
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void MCObjectStreamer::flushPendingLabels(MCFragment *F, uint64_t FOffset) {
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2014-10-22 22:38:06 +00:00
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if (PendingLabels.size()) {
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if (!F) {
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F = new MCDataFragment();
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2015-05-27 21:04:14 +00:00
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MCSection *CurSection = getCurrentSectionOnly();
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2015-05-27 20:52:32 +00:00
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CurSection->getFragmentList().insert(CurInsertionPoint, F);
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F->setParent(CurSection);
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2014-10-22 22:38:06 +00:00
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}
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2015-05-29 17:41:59 +00:00
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for (MCSymbol *Sym : PendingLabels) {
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MCSymbolData *SD = &Sym->getData();
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2014-10-22 22:38:06 +00:00
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SD->setFragment(F);
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2015-04-12 23:42:25 +00:00
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SD->setOffset(FOffset);
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2014-10-22 22:38:06 +00:00
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}
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PendingLabels.clear();
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}
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}
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2015-05-21 02:41:23 +00:00
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bool MCObjectStreamer::emitAbsoluteSymbolDiff(const MCSymbol *Hi,
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const MCSymbol *Lo,
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unsigned Size) {
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// Must have symbol data.
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if (!Assembler->hasSymbolData(*Hi) || !Assembler->hasSymbolData(*Lo))
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return false;
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2015-05-28 21:36:02 +00:00
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auto &HiD = Hi->getData();
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auto &LoD = Lo->getData();
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2015-05-21 02:41:23 +00:00
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// Must both be assigned to the same (valid) fragment.
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if (!HiD.getFragment() || HiD.getFragment() != LoD.getFragment())
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return false;
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// Must be a data fragment.
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if (!isa<MCDataFragment>(HiD.getFragment()))
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return false;
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assert(HiD.getOffset() >= LoD.getOffset() &&
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"Expected Hi to be greater than Lo");
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EmitIntValue(HiD.getOffset() - LoD.getOffset(), Size);
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return true;
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}
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2012-12-12 22:59:46 +00:00
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void MCObjectStreamer::reset() {
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2012-12-14 18:52:11 +00:00
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if (Assembler)
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Assembler->reset();
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2015-05-27 15:14:11 +00:00
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CurInsertionPoint = MCSection::iterator();
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2014-05-12 14:02:44 +00:00
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EmitEHFrame = true;
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EmitDebugFrame = false;
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2014-10-22 22:38:06 +00:00
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PendingLabels.clear();
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2012-12-12 22:59:46 +00:00
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MCStreamer::reset();
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}
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2014-05-12 14:02:44 +00:00
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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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2010-07-19 06:13:10 +00:00
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MCFragment *MCObjectStreamer::getCurrentFragment() const {
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2015-05-27 21:04:14 +00:00
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assert(getCurrentSectionOnly() && "No current section!");
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2010-07-19 06:13:10 +00:00
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2015-05-27 21:04:14 +00:00
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if (CurInsertionPoint != getCurrentSectionOnly()->getFragmentList().begin())
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2014-03-02 12:27:27 +00:00
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return std::prev(CurInsertionPoint);
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2010-07-19 06:13:10 +00:00
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2014-04-13 04:57:38 +00:00
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return nullptr;
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2010-07-19 06:13:10 +00:00
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}
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2014-10-22 22:38:06 +00:00
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MCDataFragment *MCObjectStreamer::getOrCreateDataFragment() {
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2010-07-19 06:13:10 +00:00
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MCDataFragment *F = dyn_cast_or_null<MCDataFragment>(getCurrentFragment());
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2013-02-15 22:50:52 +00:00
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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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2015-04-12 23:42:25 +00:00
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if (!F || (Assembler->isBundlingEnabled() && !Assembler->getRelaxAll() &&
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F->hasInstructions())) {
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2014-04-10 21:53:47 +00:00
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F = new MCDataFragment();
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2013-04-17 21:18:16 +00:00
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insert(F);
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}
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2010-07-19 06:13:10 +00:00
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return F;
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}
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2014-06-25 15:29:54 +00:00
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void MCObjectStreamer::visitUsedSymbol(const MCSymbol &Sym) {
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Assembler->getOrCreateSymbolData(Sym);
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}
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2014-05-12 14:02:44 +00:00
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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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2014-04-22 17:27:29 +00:00
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void MCObjectStreamer::EmitValueImpl(const MCExpr *Value, unsigned Size,
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const SMLoc &Loc) {
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2014-06-25 18:37:33 +00:00
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MCStreamer::EmitValueImpl(Value, Size, Loc);
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2010-11-28 23:08:47 +00:00
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MCDataFragment *DF = getOrCreateDataFragment();
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2013-05-25 21:56:53 +00:00
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MCLineEntry::Make(this, getCurrentSection().first);
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2010-11-28 23:08:47 +00:00
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// Avoid fixups when possible.
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int64_t AbsValue;
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2014-06-25 14:42:14 +00:00
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if (Value->EvaluateAsAbsolute(AbsValue, getAssembler())) {
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2013-07-02 15:49:13 +00:00
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EmitIntValue(AbsValue, Size);
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2010-12-03 02:54:21 +00:00
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return;
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2010-11-28 23:08:47 +00:00
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}
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2012-12-07 19:13:57 +00:00
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DF->getFixups().push_back(
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2015-05-15 19:13:05 +00:00
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MCFixup::create(DF->getContents().size(), Value,
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2014-04-22 17:27:29 +00:00
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MCFixup::getKindForSize(Size, false), Loc));
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2010-12-03 02:54:21 +00:00
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DF->getContents().resize(DF->getContents().size() + Size, 0);
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2010-11-28 23:08:47 +00:00
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}
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2014-11-03 12:19:03 +00:00
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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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2015-05-18 18:43:14 +00:00
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Frame.Begin = getContext().createTempSymbol();
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2014-11-03 12:19:03 +00:00
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EmitLabel(Frame.Begin);
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2012-01-07 22:42:19 +00:00
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}
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2012-01-09 00:17:29 +00:00
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void MCObjectStreamer::EmitCFIEndProcImpl(MCDwarfFrameInfo &Frame) {
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2015-05-18 18:43:14 +00:00
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Frame.End = getContext().createTempSymbol();
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2014-06-25 00:13:59 +00:00
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EmitLabel(Frame.End);
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2012-01-09 00:17:29 +00:00
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}
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2010-11-28 17:18:55 +00:00
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void MCObjectStreamer::EmitLabel(MCSymbol *Symbol) {
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2011-04-27 15:21:19 +00:00
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MCStreamer::EmitLabel(Symbol);
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2010-11-28 17:18:55 +00:00
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MCSymbolData &SD = getAssembler().getOrCreateSymbolData(*Symbol);
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assert(!SD.getFragment() && "Unexpected fragment on symbol data!");
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2014-10-22 22:38:06 +00:00
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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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2015-04-12 23:42:25 +00:00
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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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2014-10-22 22:38:06 +00:00
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SD.setFragment(F);
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SD.setOffset(F->getContents().size());
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} else {
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2015-05-29 17:41:59 +00:00
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PendingLabels.push_back(Symbol);
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2014-10-22 22:38:06 +00:00
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}
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2010-11-28 17:18:55 +00:00
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}
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2011-04-21 23:39:26 +00:00
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void MCObjectStreamer::EmitULEB128Value(const MCExpr *Value) {
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2010-12-03 01:19:49 +00:00
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int64_t IntValue;
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2010-12-18 03:57:21 +00:00
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if (Value->EvaluateAsAbsolute(IntValue, getAssembler())) {
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2011-04-21 23:39:26 +00:00
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EmitULEB128IntValue(IntValue);
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2010-12-03 01:19:49 +00:00
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return;
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}
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2013-04-17 21:18:16 +00:00
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insert(new MCLEBFragment(*Value, false));
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2010-11-02 17:22:24 +00:00
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}
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2011-04-21 23:39:26 +00:00
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void MCObjectStreamer::EmitSLEB128Value(const MCExpr *Value) {
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2010-12-03 01:19:49 +00:00
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int64_t IntValue;
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2010-12-18 03:57:21 +00:00
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if (Value->EvaluateAsAbsolute(IntValue, getAssembler())) {
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2011-04-21 23:39:26 +00:00
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EmitSLEB128IntValue(IntValue);
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2010-12-03 01:19:49 +00:00
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return;
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}
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2013-04-17 21:18:16 +00:00
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insert(new MCLEBFragment(*Value, true));
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2010-11-02 17:22:24 +00:00
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}
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2010-11-01 14:28:48 +00:00
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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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2015-05-21 19:20:38 +00:00
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void MCObjectStreamer::ChangeSection(MCSection *Section,
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2013-04-17 21:18:16 +00:00
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const MCExpr *Subsection) {
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2015-03-20 20:00:01 +00:00
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changeSectionImpl(Section, Subsection);
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}
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2015-05-21 19:20:38 +00:00
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bool MCObjectStreamer::changeSectionImpl(MCSection *Section,
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2015-03-20 20:00:01 +00:00
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const MCExpr *Subsection) {
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2010-06-16 20:04:25 +00:00
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assert(Section && "Cannot switch to a null section!");
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2014-10-22 22:38:06 +00:00
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flushPendingLabels(nullptr);
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2010-06-16 20:04:25 +00:00
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2015-05-26 15:07:25 +00:00
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bool Created = getAssembler().registerSection(*Section);
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2013-04-17 21:18:16 +00:00
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int64_t IntSubsection = 0;
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if (Subsection &&
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!Subsection->EvaluateAsAbsolute(IntSubsection, getAssembler()))
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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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CurInsertionPoint =
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2015-05-27 20:52:32 +00:00
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Section->getSubsectionInsertionPoint(unsigned(IntSubsection));
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2015-03-20 20:00:01 +00:00
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return Created;
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2010-06-16 20:04:25 +00:00
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}
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2012-12-07 17:42:41 +00:00
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void MCObjectStreamer::EmitAssignment(MCSymbol *Symbol, const MCExpr *Value) {
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getAssembler().getOrCreateSymbolData(*Symbol);
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2014-03-20 09:44:49 +00:00
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MCStreamer::EmitAssignment(Symbol, Value);
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2012-12-07 17:42:41 +00:00
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}
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2015-05-25 18:34:26 +00:00
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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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2014-06-25 18:37:33 +00:00
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void MCObjectStreamer::EmitInstruction(const MCInst &Inst,
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const MCSubtargetInfo &STI) {
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MCStreamer::EmitInstruction(Inst, STI);
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2010-11-01 16:27:31 +00:00
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2015-05-27 21:04:14 +00:00
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MCSection *Sec = getCurrentSectionOnly();
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2015-05-26 14:48:11 +00:00
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Sec->setHasInstructions(true);
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2010-11-01 16:27:31 +00:00
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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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2013-04-17 21:18:16 +00:00
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MCLineEntry::Make(this, getCurrentSection().first);
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2010-11-01 16:27:31 +00:00
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// If this instruction doesn't need relaxation, just emit it as data.
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2012-12-20 19:05:53 +00:00
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MCAssembler &Assembler = getAssembler();
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if (!Assembler.getBackend().mayNeedRelaxation(Inst)) {
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2014-01-28 23:12:49 +00:00
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EmitInstToData(Inst, STI);
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2010-11-01 16:27:31 +00:00
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return;
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}
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2012-12-20 19:05:53 +00:00
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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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2015-05-26 14:48:11 +00:00
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(Assembler.isBundlingEnabled() && Sec->isBundleLocked())) {
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2010-11-01 16:27:31 +00:00
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MCInst Relaxed;
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2012-01-18 18:52:16 +00:00
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getAssembler().getBackend().relaxInstruction(Inst, Relaxed);
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while (getAssembler().getBackend().mayNeedRelaxation(Relaxed))
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getAssembler().getBackend().relaxInstruction(Relaxed, Relaxed);
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2014-01-28 23:12:49 +00:00
|
|
|
EmitInstToData(Relaxed, STI);
|
2010-11-01 16:27:31 +00:00
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
|
|
|
// Otherwise emit to a separate fragment.
|
2014-01-28 23:12:49 +00:00
|
|
|
EmitInstToFragment(Inst, STI);
|
2010-11-01 16:27:31 +00:00
|
|
|
}
|
|
|
|
|
2014-01-28 23:12:49 +00:00
|
|
|
void MCObjectStreamer::EmitInstToFragment(const MCInst &Inst,
|
|
|
|
const MCSubtargetInfo &STI) {
|
2015-04-12 23:42:25 +00:00
|
|
|
if (getAssembler().getRelaxAll() && getAssembler().isBundlingEnabled())
|
|
|
|
llvm_unreachable("All instructions should have already been relaxed");
|
|
|
|
|
2012-12-20 19:05:53 +00:00
|
|
|
// Always create a new, separate fragment here, because its size can change
|
|
|
|
// during relaxation.
|
2014-01-28 23:12:53 +00:00
|
|
|
MCRelaxableFragment *IF = new MCRelaxableFragment(Inst, STI);
|
2013-04-17 21:18:16 +00:00
|
|
|
insert(IF);
|
2010-12-02 05:44:06 +00:00
|
|
|
|
2011-04-18 20:54:46 +00:00
|
|
|
SmallString<128> Code;
|
|
|
|
raw_svector_ostream VecOS(Code);
|
2015-05-15 19:13:16 +00:00
|
|
|
getAssembler().getEmitter().encodeInstruction(Inst, VecOS, IF->getFixups(),
|
2014-01-28 23:13:07 +00:00
|
|
|
STI);
|
2011-04-18 20:54:46 +00:00
|
|
|
VecOS.flush();
|
2012-12-07 19:13:57 +00:00
|
|
|
IF->getContents().append(Code.begin(), Code.end());
|
2010-12-02 05:44:06 +00:00
|
|
|
}
|
|
|
|
|
2013-02-15 23:12:33 +00:00
|
|
|
#ifndef NDEBUG
|
2013-07-16 01:17:10 +00:00
|
|
|
static const char *const BundlingNotImplementedMsg =
|
2012-12-20 19:05:53 +00:00
|
|
|
"Aligned bundling is not implemented for this object format";
|
2013-02-15 23:12:33 +00:00
|
|
|
#endif
|
2012-12-20 19:05:53 +00:00
|
|
|
|
|
|
|
void MCObjectStreamer::EmitBundleAlignMode(unsigned AlignPow2) {
|
|
|
|
llvm_unreachable(BundlingNotImplementedMsg);
|
|
|
|
}
|
|
|
|
|
2013-01-07 21:51:08 +00:00
|
|
|
void MCObjectStreamer::EmitBundleLock(bool AlignToEnd) {
|
2012-12-20 19:05:53 +00:00
|
|
|
llvm_unreachable(BundlingNotImplementedMsg);
|
|
|
|
}
|
|
|
|
|
|
|
|
void MCObjectStreamer::EmitBundleUnlock() {
|
|
|
|
llvm_unreachable(BundlingNotImplementedMsg);
|
|
|
|
}
|
|
|
|
|
2013-06-19 21:27:27 +00:00
|
|
|
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.
|
|
|
|
MCLineEntry::Make(this, getCurrentSection().first);
|
|
|
|
|
|
|
|
this->MCStreamer::EmitDwarfLocDirective(FileNo, Line, Column, Flags,
|
|
|
|
Isa, Discriminator, FileName);
|
|
|
|
}
|
|
|
|
|
2014-08-15 14:31:47 +00:00
|
|
|
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;
|
|
|
|
}
|
|
|
|
|
2014-08-15 14:43:02 +00:00
|
|
|
static void emitDwarfSetLineAddr(MCObjectStreamer &OS, 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, LineDelta, 0);
|
|
|
|
}
|
|
|
|
|
2010-12-03 00:55:40 +00:00
|
|
|
void MCObjectStreamer::EmitDwarfAdvanceLineAddr(int64_t LineDelta,
|
|
|
|
const MCSymbol *LastLabel,
|
2011-07-14 05:43:07 +00:00
|
|
|
const MCSymbol *Label,
|
|
|
|
unsigned PointerSize) {
|
2010-12-03 00:55:40 +00:00
|
|
|
if (!LastLabel) {
|
2014-08-15 14:43:02 +00:00
|
|
|
emitDwarfSetLineAddr(*this, LineDelta, Label, PointerSize);
|
2010-12-03 00:55:40 +00:00
|
|
|
return;
|
|
|
|
}
|
2014-08-15 14:31:47 +00:00
|
|
|
const MCExpr *AddrDelta = buildSymbolDiff(*this, Label, LastLabel);
|
2010-12-03 00:55:40 +00:00
|
|
|
int64_t Res;
|
2010-12-18 03:57:21 +00:00
|
|
|
if (AddrDelta->EvaluateAsAbsolute(Res, getAssembler())) {
|
2010-12-03 00:55:40 +00:00
|
|
|
MCDwarfLineAddr::Emit(this, LineDelta, Res);
|
|
|
|
return;
|
|
|
|
}
|
2013-04-17 21:18:16 +00:00
|
|
|
insert(new MCDwarfLineAddrFragment(LineDelta, *AddrDelta));
|
2010-12-03 00:55:40 +00:00
|
|
|
}
|
|
|
|
|
2010-12-28 05:39:27 +00:00
|
|
|
void MCObjectStreamer::EmitDwarfAdvanceFrameAddr(const MCSymbol *LastLabel,
|
|
|
|
const MCSymbol *Label) {
|
2014-08-15 14:31:47 +00:00
|
|
|
const MCExpr *AddrDelta = buildSymbolDiff(*this, Label, LastLabel);
|
2010-12-28 05:39:27 +00:00
|
|
|
int64_t Res;
|
|
|
|
if (AddrDelta->EvaluateAsAbsolute(Res, getAssembler())) {
|
|
|
|
MCDwarfFrameEmitter::EmitAdvanceLoc(*this, Res);
|
|
|
|
return;
|
|
|
|
}
|
2013-04-17 21:18:16 +00:00
|
|
|
insert(new MCDwarfCallFrameFragment(*AddrDelta));
|
2010-12-28 05:39:27 +00:00
|
|
|
}
|
|
|
|
|
2013-07-02 15:49:13 +00:00
|
|
|
void MCObjectStreamer::EmitBytes(StringRef Data) {
|
2013-10-20 02:16:18 +00:00
|
|
|
MCLineEntry::Make(this, getCurrentSection().first);
|
2012-10-04 13:12:43 +00:00
|
|
|
getOrCreateDataFragment()->getContents().append(Data.begin(), Data.end());
|
|
|
|
}
|
|
|
|
|
|
|
|
void MCObjectStreamer::EmitValueToAlignment(unsigned ByteAlignment,
|
|
|
|
int64_t Value,
|
|
|
|
unsigned ValueSize,
|
|
|
|
unsigned MaxBytesToEmit) {
|
|
|
|
if (MaxBytesToEmit == 0)
|
|
|
|
MaxBytesToEmit = ByteAlignment;
|
2013-04-17 21:18:16 +00:00
|
|
|
insert(new MCAlignFragment(ByteAlignment, Value, ValueSize, MaxBytesToEmit));
|
2012-10-04 13:12:43 +00:00
|
|
|
|
|
|
|
// Update the maximum alignment on the current section if necessary.
|
2015-05-21 21:02:35 +00:00
|
|
|
MCSection *CurSec = getCurrentSection().first;
|
|
|
|
if (ByteAlignment > CurSec->getAlignment())
|
|
|
|
CurSec->setAlignment(ByteAlignment);
|
2012-10-04 13:12:43 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
void MCObjectStreamer::EmitCodeAlignment(unsigned ByteAlignment,
|
|
|
|
unsigned MaxBytesToEmit) {
|
|
|
|
EmitValueToAlignment(ByteAlignment, 0, 1, MaxBytesToEmit);
|
|
|
|
cast<MCAlignFragment>(getCurrentFragment())->setEmitNops(true);
|
|
|
|
}
|
|
|
|
|
2012-01-27 00:37:08 +00:00
|
|
|
bool MCObjectStreamer::EmitValueToOffset(const MCExpr *Offset,
|
2012-01-26 23:47:45 +00:00
|
|
|
unsigned char Value) {
|
2011-02-20 20:20:07 +00:00
|
|
|
int64_t Res;
|
|
|
|
if (Offset->EvaluateAsAbsolute(Res, getAssembler())) {
|
2013-04-17 21:18:16 +00:00
|
|
|
insert(new MCOrgFragment(*Offset, Value));
|
2012-01-27 00:37:08 +00:00
|
|
|
return false;
|
2011-02-20 20:20:07 +00:00
|
|
|
}
|
|
|
|
|
2015-05-18 18:43:14 +00:00
|
|
|
MCSymbol *CurrentPos = getContext().createTempSymbol();
|
2011-02-20 20:20:07 +00:00
|
|
|
EmitLabel(CurrentPos);
|
|
|
|
MCSymbolRefExpr::VariantKind Variant = MCSymbolRefExpr::VK_None;
|
|
|
|
const MCExpr *Ref =
|
|
|
|
MCSymbolRefExpr::Create(CurrentPos, Variant, getContext());
|
|
|
|
const MCExpr *Delta =
|
|
|
|
MCBinaryExpr::Create(MCBinaryExpr::Sub, Offset, Ref, getContext());
|
|
|
|
|
|
|
|
if (!Delta->EvaluateAsAbsolute(Res, getAssembler()))
|
2012-01-27 00:37:08 +00:00
|
|
|
return true;
|
2013-01-09 01:35:34 +00:00
|
|
|
EmitFill(Res, Value);
|
2012-01-27 00:37:08 +00:00
|
|
|
return false;
|
2010-12-02 05:59:38 +00:00
|
|
|
}
|
|
|
|
|
2011-11-23 22:18:04 +00:00
|
|
|
// Associate GPRel32 fixup with data and resize data area
|
|
|
|
void MCObjectStreamer::EmitGPRel32Value(const MCExpr *Value) {
|
|
|
|
MCDataFragment *DF = getOrCreateDataFragment();
|
|
|
|
|
2015-05-15 19:13:05 +00:00
|
|
|
DF->getFixups().push_back(MCFixup::create(DF->getContents().size(),
|
2012-12-07 19:13:57 +00:00
|
|
|
Value, FK_GPRel_4));
|
2011-11-23 22:18:04 +00:00
|
|
|
DF->getContents().resize(DF->getContents().size() + 4, 0);
|
|
|
|
}
|
|
|
|
|
2012-08-22 00:49:30 +00:00
|
|
|
// Associate GPRel32 fixup with data and resize data area
|
|
|
|
void MCObjectStreamer::EmitGPRel64Value(const MCExpr *Value) {
|
|
|
|
MCDataFragment *DF = getOrCreateDataFragment();
|
|
|
|
|
2015-05-15 19:13:05 +00:00
|
|
|
DF->getFixups().push_back(MCFixup::create(DF->getContents().size(),
|
2012-12-07 19:13:57 +00:00
|
|
|
Value, FK_GPRel_4));
|
2012-08-22 00:49:30 +00:00
|
|
|
DF->getContents().resize(DF->getContents().size() + 8, 0);
|
|
|
|
}
|
|
|
|
|
2013-07-02 15:49:13 +00:00
|
|
|
void MCObjectStreamer::EmitFill(uint64_t NumBytes, uint8_t FillValue) {
|
2012-10-01 15:14:14 +00:00
|
|
|
// FIXME: A MCFillFragment would be more memory efficient but MCExpr has
|
|
|
|
// problems evaluating expressions across multiple fragments.
|
|
|
|
getOrCreateDataFragment()->getContents().append(NumBytes, FillValue);
|
|
|
|
}
|
|
|
|
|
2013-07-02 15:49:13 +00:00
|
|
|
void MCObjectStreamer::EmitZeros(uint64_t NumBytes) {
|
2014-12-12 21:48:03 +00:00
|
|
|
const MCSection *Sec = getCurrentSection().first;
|
|
|
|
assert(Sec && "need a section");
|
|
|
|
unsigned ItemSize = Sec->isVirtualSection() ? 0 : 1;
|
2013-06-27 14:35:03 +00:00
|
|
|
insert(new MCFillFragment(0, ItemSize, NumBytes));
|
|
|
|
}
|
|
|
|
|
2012-01-07 03:13:18 +00:00
|
|
|
void MCObjectStreamer::FinishImpl() {
|
2011-12-09 18:09:40 +00:00
|
|
|
// If we are generating dwarf for assembly source files dump out the sections.
|
|
|
|
if (getContext().getGenDwarfForAssembly())
|
2014-04-01 07:35:52 +00:00
|
|
|
MCGenDwarfInfo::Emit(this);
|
|
|
|
|
|
|
|
// Dump out the dwarf file & directory tables and line tables.
|
|
|
|
MCDwarfLineTable::Emit(this);
|
2011-12-09 18:09:40 +00:00
|
|
|
|
2014-10-22 22:38:06 +00:00
|
|
|
flushPendingLabels(nullptr);
|
2010-06-16 20:04:25 +00:00
|
|
|
getAssembler().Finish();
|
|
|
|
}
|