2010-06-17 04:04:22 +08:00
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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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2012-03-26 14:58:25 +08:00
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#include "llvm/MC/MCAsmBackend.h"
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#include "llvm/MC/MCAsmInfo.h"
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2010-06-17 04:04:22 +08:00
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#include "llvm/MC/MCAssembler.h"
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2010-07-30 01:48:06 +08:00
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#include "llvm/MC/MCCodeEmitter.h"
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2010-12-10 15:39:47 +08:00
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#include "llvm/MC/MCContext.h"
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2010-11-02 00:27:31 +08:00
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#include "llvm/MC/MCDwarf.h"
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2010-07-19 14:13:10 +08:00
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#include "llvm/MC/MCExpr.h"
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2012-03-26 14:58:25 +08:00
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#include "llvm/MC/MCObjectWriter.h"
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2010-11-29 01:18:55 +08:00
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#include "llvm/MC/MCSymbol.h"
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2012-03-26 14:58:25 +08:00
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#include "llvm/Support/ErrorHandling.h"
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2010-06-17 04:04:22 +08:00
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using namespace llvm;
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2013-02-01 07:29:57 +08:00
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MCObjectStreamer::MCObjectStreamer(StreamerKind Kind, MCContext &Context,
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MCAsmBackend &TAB, raw_ostream &OS,
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MCCodeEmitter *Emitter_)
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: MCStreamer(Kind, Context),
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Assembler(new MCAssembler(Context, TAB, *Emitter_,
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*TAB.createObjectWriter(OS), OS)),
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CurSectionData(0) {}
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2010-06-17 04:04:22 +08:00
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2013-02-01 07:29:57 +08:00
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MCObjectStreamer::MCObjectStreamer(StreamerKind Kind, MCContext &Context,
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MCAsmBackend &TAB, raw_ostream &OS,
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MCCodeEmitter *Emitter_,
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2011-03-10 01:33:05 +08:00
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MCAssembler *_Assembler)
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2013-02-01 07:29:57 +08:00
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: MCStreamer(Kind, Context), Assembler(_Assembler), CurSectionData(0) {}
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2011-03-10 01:33:05 +08:00
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2010-06-17 04:04:22 +08:00
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MCObjectStreamer::~MCObjectStreamer() {
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2010-07-30 01:48:06 +08:00
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delete &Assembler->getBackend();
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delete &Assembler->getEmitter();
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2010-12-17 10:45:41 +08:00
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delete &Assembler->getWriter();
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2010-06-17 04:04:22 +08:00
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delete Assembler;
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}
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2010-06-17 04:04:25 +08:00
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2012-12-13 06:59:46 +08:00
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void MCObjectStreamer::reset() {
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2012-12-15 02:52:11 +08:00
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if (Assembler)
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Assembler->reset();
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2013-01-05 02:04:42 +08:00
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CurSectionData = 0;
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2012-12-13 06:59:46 +08:00
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MCStreamer::reset();
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}
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2010-07-19 14:13:10 +08:00
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MCFragment *MCObjectStreamer::getCurrentFragment() const {
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assert(getCurrentSectionData() && "No current section!");
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if (!getCurrentSectionData()->empty())
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return &getCurrentSectionData()->getFragmentList().back();
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return 0;
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}
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MCDataFragment *MCObjectStreamer::getOrCreateDataFragment() const {
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MCDataFragment *F = dyn_cast_or_null<MCDataFragment>(getCurrentFragment());
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2013-02-16 06:50:52 +08:00
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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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if (!F || (Assembler->isBundlingEnabled() && F->hasInstructions()))
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2010-07-19 14:13:10 +08:00
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F = new MCDataFragment(getCurrentSectionData());
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return F;
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}
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const MCExpr *MCObjectStreamer::AddValueSymbols(const MCExpr *Value) {
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switch (Value->getKind()) {
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2011-01-13 15:58:56 +08:00
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case MCExpr::Target:
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cast<MCTargetExpr>(Value)->AddValueSymbols(Assembler);
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break;
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2010-07-19 14:13:10 +08:00
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case MCExpr::Constant:
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break;
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case MCExpr::Binary: {
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const MCBinaryExpr *BE = cast<MCBinaryExpr>(Value);
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AddValueSymbols(BE->getLHS());
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AddValueSymbols(BE->getRHS());
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break;
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}
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case MCExpr::SymbolRef:
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Assembler->getOrCreateSymbolData(cast<MCSymbolRefExpr>(Value)->getSymbol());
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break;
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case MCExpr::Unary:
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AddValueSymbols(cast<MCUnaryExpr>(Value)->getSubExpr());
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break;
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}
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return Value;
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}
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2010-12-10 15:39:47 +08:00
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void MCObjectStreamer::EmitValueImpl(const MCExpr *Value, unsigned Size,
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2011-05-01 11:50:49 +08:00
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unsigned AddrSpace) {
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2010-11-29 07:08:47 +08:00
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assert(AddrSpace == 0 && "Address space must be 0!");
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MCDataFragment *DF = getOrCreateDataFragment();
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// Avoid fixups when possible.
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int64_t AbsValue;
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2010-12-18 11:57:21 +08:00
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if (AddValueSymbols(Value)->EvaluateAsAbsolute(AbsValue, getAssembler())) {
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2010-12-03 10:54:21 +08:00
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EmitIntValue(AbsValue, Size, AddrSpace);
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return;
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2010-11-29 07:08:47 +08:00
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}
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2012-12-08 03:13:57 +08:00
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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)));
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2010-12-03 10:54:21 +08:00
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DF->getContents().resize(DF->getContents().size() + Size, 0);
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2010-11-29 07:08:47 +08:00
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}
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2012-01-08 06:42:19 +08:00
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void MCObjectStreamer::EmitCFIStartProcImpl(MCDwarfFrameInfo &Frame) {
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RecordProcStart(Frame);
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}
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2012-01-09 08:17:29 +08:00
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void MCObjectStreamer::EmitCFIEndProcImpl(MCDwarfFrameInfo &Frame) {
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RecordProcEnd(Frame);
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}
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2010-11-29 01:18:55 +08:00
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void MCObjectStreamer::EmitLabel(MCSymbol *Symbol) {
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2011-04-27 23:21:19 +08:00
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MCStreamer::EmitLabel(Symbol);
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2010-11-29 01:18:55 +08:00
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MCSymbolData &SD = getAssembler().getOrCreateSymbolData(*Symbol);
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// FIXME: This is wasteful, we don't necessarily need to create a data
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// fragment. Instead, we should mark the symbol as pointing into the data
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// fragment if it exists, otherwise we should just queue the label and set its
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// fragment pointer when we emit the next fragment.
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MCDataFragment *F = getOrCreateDataFragment();
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assert(!SD.getFragment() && "Unexpected fragment on symbol data!");
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SD.setFragment(F);
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SD.setOffset(F->getContents().size());
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}
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2012-12-16 12:00:45 +08:00
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void MCObjectStreamer::EmitDebugLabel(MCSymbol *Symbol) {
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EmitLabel(Symbol);
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}
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2011-04-22 07:39:26 +08:00
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void MCObjectStreamer::EmitULEB128Value(const MCExpr *Value) {
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2010-12-03 09:19:49 +08:00
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int64_t IntValue;
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2010-12-18 11:57:21 +08:00
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if (Value->EvaluateAsAbsolute(IntValue, getAssembler())) {
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2011-04-22 07:39:26 +08:00
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EmitULEB128IntValue(IntValue);
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2010-12-03 09:19:49 +08:00
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return;
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}
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2011-05-20 05:40:34 +08:00
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Value = ForceExpAbs(Value);
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2010-11-03 01:22:24 +08:00
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new MCLEBFragment(*Value, false, getCurrentSectionData());
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}
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2011-04-22 07:39:26 +08:00
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void MCObjectStreamer::EmitSLEB128Value(const MCExpr *Value) {
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2010-12-03 09:19:49 +08:00
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int64_t IntValue;
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2010-12-18 11:57:21 +08:00
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if (Value->EvaluateAsAbsolute(IntValue, getAssembler())) {
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2011-04-22 07:39:26 +08:00
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EmitSLEB128IntValue(IntValue);
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2010-12-03 09:19:49 +08:00
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return;
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}
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2011-05-20 05:40:34 +08:00
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Value = ForceExpAbs(Value);
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2010-11-03 01:22:24 +08:00
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new MCLEBFragment(*Value, true, getCurrentSectionData());
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}
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2010-11-01 22:28:48 +08:00
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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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2011-02-16 09:08:29 +08:00
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void MCObjectStreamer::ChangeSection(const MCSection *Section) {
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2010-06-17 04:04:25 +08:00
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assert(Section && "Cannot switch to a null section!");
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CurSectionData = &getAssembler().getOrCreateSectionData(*Section);
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}
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2012-12-08 01:42:41 +08:00
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void MCObjectStreamer::EmitAssignment(MCSymbol *Symbol, const MCExpr *Value) {
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getAssembler().getOrCreateSymbolData(*Symbol);
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Symbol->setVariableValue(AddValueSymbols(Value));
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}
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2010-11-02 00:27:31 +08:00
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void MCObjectStreamer::EmitInstruction(const MCInst &Inst) {
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// Scan for values.
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for (unsigned i = Inst.getNumOperands(); i--; )
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if (Inst.getOperand(i).isExpr())
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AddValueSymbols(Inst.getOperand(i).getExpr());
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2012-12-21 03:05:53 +08:00
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MCSectionData *SD = getCurrentSectionData();
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SD->setHasInstructions(true);
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2010-11-02 00:27:31 +08:00
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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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MCLineEntry::Make(this, getCurrentSection());
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// If this instruction doesn't need relaxation, just emit it as data.
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2012-12-21 03:05:53 +08:00
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MCAssembler &Assembler = getAssembler();
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if (!Assembler.getBackend().mayNeedRelaxation(Inst)) {
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2010-11-02 00:27:31 +08:00
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EmitInstToData(Inst);
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return;
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}
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2012-12-21 03:05:53 +08:00
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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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(Assembler.isBundlingEnabled() && SD->isBundleLocked())) {
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2010-11-02 00:27:31 +08:00
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MCInst Relaxed;
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2012-01-19 02:52:16 +08:00
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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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2010-11-02 00:27:31 +08:00
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EmitInstToData(Relaxed);
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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);
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}
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2010-12-02 13:44:06 +08:00
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void MCObjectStreamer::EmitInstToFragment(const MCInst &Inst) {
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2012-12-21 03:05:53 +08:00
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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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2013-01-08 08:22:56 +08:00
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MCRelaxableFragment *IF =
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new MCRelaxableFragment(Inst, getCurrentSectionData());
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2010-12-02 13:44:06 +08:00
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2011-04-19 04:54:46 +08:00
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SmallString<128> Code;
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raw_svector_ostream VecOS(Code);
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2010-12-02 13:44:06 +08:00
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getAssembler().getEmitter().EncodeInstruction(Inst, VecOS, IF->getFixups());
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2011-04-19 04:54:46 +08:00
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VecOS.flush();
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2012-12-08 03:13:57 +08:00
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IF->getContents().append(Code.begin(), Code.end());
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2010-12-02 13:44:06 +08:00
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}
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2013-02-15 20:30:38 +08:00
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static const char *BundlingNotImplementedMsg =
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2012-12-21 03:05:53 +08:00
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"Aligned bundling is not implemented for this object format";
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void MCObjectStreamer::EmitBundleAlignMode(unsigned AlignPow2) {
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llvm_unreachable(BundlingNotImplementedMsg);
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}
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2013-01-08 05:51:08 +08:00
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void MCObjectStreamer::EmitBundleLock(bool AlignToEnd) {
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2012-12-21 03:05:53 +08:00
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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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2010-12-03 08:55:40 +08:00
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void MCObjectStreamer::EmitDwarfAdvanceLineAddr(int64_t LineDelta,
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const MCSymbol *LastLabel,
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2011-07-14 13:43:07 +08:00
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const MCSymbol *Label,
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unsigned PointerSize) {
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2010-12-03 08:55:40 +08:00
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if (!LastLabel) {
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EmitDwarfSetLineAddr(LineDelta, Label, PointerSize);
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return;
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}
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2010-12-28 13:39:27 +08:00
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const MCExpr *AddrDelta = BuildSymbolDiff(getContext(), Label, LastLabel);
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2010-12-03 08:55:40 +08:00
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int64_t Res;
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2010-12-18 11:57:21 +08:00
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if (AddrDelta->EvaluateAsAbsolute(Res, getAssembler())) {
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2010-12-03 08:55:40 +08:00
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MCDwarfLineAddr::Emit(this, LineDelta, Res);
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return;
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}
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2011-05-20 05:40:34 +08:00
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AddrDelta = ForceExpAbs(AddrDelta);
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2010-12-03 08:55:40 +08:00
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new MCDwarfLineAddrFragment(LineDelta, *AddrDelta, getCurrentSectionData());
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}
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2010-12-28 13:39:27 +08:00
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void MCObjectStreamer::EmitDwarfAdvanceFrameAddr(const MCSymbol *LastLabel,
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const MCSymbol *Label) {
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const MCExpr *AddrDelta = BuildSymbolDiff(getContext(), Label, LastLabel);
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int64_t Res;
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if (AddrDelta->EvaluateAsAbsolute(Res, getAssembler())) {
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MCDwarfFrameEmitter::EmitAdvanceLoc(*this, Res);
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return;
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}
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2011-05-20 05:40:34 +08:00
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AddrDelta = ForceExpAbs(AddrDelta);
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2010-12-28 13:39:27 +08:00
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new MCDwarfCallFrameFragment(*AddrDelta, getCurrentSectionData());
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}
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2012-10-04 21:12:43 +08:00
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void MCObjectStreamer::EmitBytes(StringRef Data, unsigned AddrSpace) {
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assert(AddrSpace == 0 && "Address space must be 0!");
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getOrCreateDataFragment()->getContents().append(Data.begin(), Data.end());
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}
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void MCObjectStreamer::EmitValueToAlignment(unsigned ByteAlignment,
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int64_t Value,
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unsigned ValueSize,
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unsigned MaxBytesToEmit) {
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if (MaxBytesToEmit == 0)
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MaxBytesToEmit = ByteAlignment;
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new MCAlignFragment(ByteAlignment, Value, ValueSize, MaxBytesToEmit,
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getCurrentSectionData());
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// Update the maximum alignment on the current section if necessary.
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if (ByteAlignment > getCurrentSectionData()->getAlignment())
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getCurrentSectionData()->setAlignment(ByteAlignment);
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}
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void MCObjectStreamer::EmitCodeAlignment(unsigned ByteAlignment,
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|
unsigned MaxBytesToEmit) {
|
|
|
|
EmitValueToAlignment(ByteAlignment, 0, 1, MaxBytesToEmit);
|
|
|
|
cast<MCAlignFragment>(getCurrentFragment())->setEmitNops(true);
|
|
|
|
}
|
|
|
|
|
2012-01-27 08:37:08 +08:00
|
|
|
bool MCObjectStreamer::EmitValueToOffset(const MCExpr *Offset,
|
2012-01-27 07:47:45 +08:00
|
|
|
unsigned char Value) {
|
2011-02-21 04:20:07 +08:00
|
|
|
int64_t Res;
|
|
|
|
if (Offset->EvaluateAsAbsolute(Res, getAssembler())) {
|
|
|
|
new MCOrgFragment(*Offset, Value, getCurrentSectionData());
|
2012-01-27 08:37:08 +08:00
|
|
|
return false;
|
2011-02-21 04:20:07 +08:00
|
|
|
}
|
|
|
|
|
|
|
|
MCSymbol *CurrentPos = getContext().CreateTempSymbol();
|
|
|
|
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 08:37:08 +08:00
|
|
|
return true;
|
2013-01-09 09:35:34 +08:00
|
|
|
EmitFill(Res, Value);
|
2012-01-27 08:37:08 +08:00
|
|
|
return false;
|
2010-12-02 13:59:38 +08:00
|
|
|
}
|
|
|
|
|
2011-11-24 06:18:04 +08:00
|
|
|
// Associate GPRel32 fixup with data and resize data area
|
|
|
|
void MCObjectStreamer::EmitGPRel32Value(const MCExpr *Value) {
|
|
|
|
MCDataFragment *DF = getOrCreateDataFragment();
|
|
|
|
|
2012-12-08 03:13:57 +08:00
|
|
|
DF->getFixups().push_back(MCFixup::Create(DF->getContents().size(),
|
|
|
|
Value, FK_GPRel_4));
|
2011-11-24 06:18:04 +08:00
|
|
|
DF->getContents().resize(DF->getContents().size() + 4, 0);
|
|
|
|
}
|
|
|
|
|
2012-08-22 08:49:30 +08:00
|
|
|
// Associate GPRel32 fixup with data and resize data area
|
|
|
|
void MCObjectStreamer::EmitGPRel64Value(const MCExpr *Value) {
|
|
|
|
MCDataFragment *DF = getOrCreateDataFragment();
|
|
|
|
|
2012-12-08 03:13:57 +08:00
|
|
|
DF->getFixups().push_back(MCFixup::Create(DF->getContents().size(),
|
|
|
|
Value, FK_GPRel_4));
|
2012-08-22 08:49:30 +08:00
|
|
|
DF->getContents().resize(DF->getContents().size() + 8, 0);
|
|
|
|
}
|
|
|
|
|
2012-10-01 23:14:14 +08:00
|
|
|
void MCObjectStreamer::EmitFill(uint64_t NumBytes, uint8_t FillValue,
|
|
|
|
unsigned AddrSpace) {
|
|
|
|
assert(AddrSpace == 0 && "Address space must be 0!");
|
|
|
|
// FIXME: A MCFillFragment would be more memory efficient but MCExpr has
|
|
|
|
// problems evaluating expressions across multiple fragments.
|
|
|
|
getOrCreateDataFragment()->getContents().append(NumBytes, FillValue);
|
|
|
|
}
|
|
|
|
|
2012-01-07 11:13:18 +08:00
|
|
|
void MCObjectStreamer::FinishImpl() {
|
2010-12-10 15:39:47 +08:00
|
|
|
// Dump out the dwarf file & directory tables and line tables.
|
2012-03-03 22:24:15 +08:00
|
|
|
const MCSymbol *LineSectionSymbol = NULL;
|
2010-12-10 15:39:47 +08:00
|
|
|
if (getContext().hasDwarfFiles())
|
2012-02-29 05:13:05 +08:00
|
|
|
LineSectionSymbol = MCDwarfFileTable::Emit(this);
|
2010-12-10 15:39:47 +08:00
|
|
|
|
2011-12-10 02:09:40 +08:00
|
|
|
// If we are generating dwarf for assembly source files dump out the sections.
|
|
|
|
if (getContext().getGenDwarfForAssembly())
|
2012-02-29 05:13:05 +08:00
|
|
|
MCGenDwarfInfo::Emit(this, LineSectionSymbol);
|
2011-12-10 02:09:40 +08:00
|
|
|
|
2010-06-17 04:04:25 +08:00
|
|
|
getAssembler().Finish();
|
|
|
|
}
|