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276 lines
9.2 KiB
C++
276 lines
9.2 KiB
C++
//===-- llvm/MC/WinCOFFStreamer.cpp -----------------------------*- C++ -*-===//
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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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//
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// This file contains an implementation of a Windows COFF object file streamer.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/ADT/StringExtras.h"
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#include "llvm/MC/MCStreamer.h"
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#include "llvm/MC/MCAsmBackend.h"
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#include "llvm/MC/MCAsmLayout.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/MCContext.h"
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#include "llvm/MC/MCExpr.h"
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#include "llvm/MC/MCObjectFileInfo.h"
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#include "llvm/MC/MCObjectStreamer.h"
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#include "llvm/MC/MCSection.h"
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#include "llvm/MC/MCSectionCOFF.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/MC/MCWinCOFFStreamer.h"
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#include "llvm/Support/COFF.h"
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#include "llvm/Support/Debug.h"
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#include "llvm/Support/ErrorHandling.h"
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#include "llvm/Support/MathExtras.h"
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#include "llvm/Support/TargetRegistry.h"
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#include "llvm/Support/raw_ostream.h"
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using namespace llvm;
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#define DEBUG_TYPE "WinCOFFStreamer"
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namespace llvm {
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MCWinCOFFStreamer::MCWinCOFFStreamer(MCContext &Context, MCAsmBackend &MAB,
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MCCodeEmitter &CE, raw_ostream &OS)
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: MCObjectStreamer(Context, MAB, OS, &CE), CurSymbol(nullptr) {}
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void MCWinCOFFStreamer::EmitInstToData(const MCInst &Inst,
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const MCSubtargetInfo &STI) {
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MCDataFragment *DF = getOrCreateDataFragment();
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SmallVector<MCFixup, 4> Fixups;
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SmallString<256> Code;
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raw_svector_ostream VecOS(Code);
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getAssembler().getEmitter().EncodeInstruction(Inst, VecOS, Fixups, STI);
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VecOS.flush();
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// Add the fixups and data.
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for (unsigned i = 0, e = Fixups.size(); i != e; ++i) {
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Fixups[i].setOffset(Fixups[i].getOffset() + DF->getContents().size());
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DF->getFixups().push_back(Fixups[i]);
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}
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DF->getContents().append(Code.begin(), Code.end());
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}
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void MCWinCOFFStreamer::InitSections(bool NoExecStack) {
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// FIXME: this is identical to the ELF one.
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// This emulates the same behavior of GNU as. This makes it easier
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// to compare the output as the major sections are in the same order.
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SwitchSection(getContext().getObjectFileInfo()->getTextSection());
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EmitCodeAlignment(4);
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SwitchSection(getContext().getObjectFileInfo()->getDataSection());
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EmitCodeAlignment(4);
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SwitchSection(getContext().getObjectFileInfo()->getBSSSection());
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EmitCodeAlignment(4);
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SwitchSection(getContext().getObjectFileInfo()->getTextSection());
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}
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void MCWinCOFFStreamer::EmitLabel(MCSymbol *Symbol) {
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assert(Symbol->isUndefined() && "Cannot define a symbol twice!");
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MCObjectStreamer::EmitLabel(Symbol);
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}
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void MCWinCOFFStreamer::EmitAssemblerFlag(MCAssemblerFlag Flag) {
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llvm_unreachable("not implemented");
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}
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void MCWinCOFFStreamer::EmitThumbFunc(MCSymbol *Func) {
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llvm_unreachable("not implemented");
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}
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bool MCWinCOFFStreamer::EmitSymbolAttribute(MCSymbol *Symbol,
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MCSymbolAttr Attribute) {
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assert(Symbol && "Symbol must be non-null!");
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assert((!Symbol->isInSection() ||
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Symbol->getSection().getVariant() == MCSection::SV_COFF) &&
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"Got non-COFF section in the COFF backend!");
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MCSymbolData &SD = getAssembler().getOrCreateSymbolData(*Symbol);
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switch (Attribute) {
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default: return false;
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case MCSA_WeakReference:
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case MCSA_Weak:
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SD.modifyFlags(COFF::SF_WeakExternal, COFF::SF_WeakExternal);
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SD.setExternal(true);
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break;
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case MCSA_Global:
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SD.setExternal(true);
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break;
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}
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return true;
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}
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void MCWinCOFFStreamer::EmitSymbolDesc(MCSymbol *Symbol, unsigned DescValue) {
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llvm_unreachable("not implemented");
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}
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void MCWinCOFFStreamer::BeginCOFFSymbolDef(MCSymbol const *Symbol) {
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assert((!Symbol->isInSection() ||
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Symbol->getSection().getVariant() == MCSection::SV_COFF) &&
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"Got non-COFF section in the COFF backend!");
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if (CurSymbol)
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FatalError("starting a new symbol definition without completing the "
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"previous one");
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CurSymbol = Symbol;
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}
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void MCWinCOFFStreamer::EmitCOFFSymbolStorageClass(int StorageClass) {
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if (!CurSymbol)
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FatalError("storage class specified outside of symbol definition");
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if (StorageClass & ~0xff)
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FatalError(Twine("storage class value '") + itostr(StorageClass) +
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"' out of range");
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MCSymbolData &SD = getAssembler().getOrCreateSymbolData(*CurSymbol);
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SD.modifyFlags(StorageClass << COFF::SF_ClassShift, COFF::SF_ClassMask);
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}
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void MCWinCOFFStreamer::EmitCOFFSymbolType(int Type) {
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if (!CurSymbol)
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FatalError("symbol type specified outside of a symbol definition");
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if (Type & ~0xffff)
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FatalError(Twine("type value '") + itostr(Type) + "' out of range");
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MCSymbolData &SD = getAssembler().getOrCreateSymbolData(*CurSymbol);
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SD.modifyFlags(Type << COFF::SF_TypeShift, COFF::SF_TypeMask);
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}
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void MCWinCOFFStreamer::EndCOFFSymbolDef() {
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if (!CurSymbol)
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FatalError("ending symbol definition without starting one");
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CurSymbol = nullptr;
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}
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void MCWinCOFFStreamer::EmitCOFFSectionIndex(MCSymbol const *Symbol) {
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MCDataFragment *DF = getOrCreateDataFragment();
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const MCSymbolRefExpr *SRE = MCSymbolRefExpr::Create(Symbol, getContext());
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MCFixup Fixup = MCFixup::Create(DF->getContents().size(), SRE, FK_SecRel_2);
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DF->getFixups().push_back(Fixup);
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DF->getContents().resize(DF->getContents().size() + 2, 0);
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}
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void MCWinCOFFStreamer::EmitCOFFSecRel32(MCSymbol const *Symbol) {
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MCDataFragment *DF = getOrCreateDataFragment();
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const MCSymbolRefExpr *SRE = MCSymbolRefExpr::Create(Symbol, getContext());
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MCFixup Fixup = MCFixup::Create(DF->getContents().size(), SRE, FK_SecRel_4);
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DF->getFixups().push_back(Fixup);
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DF->getContents().resize(DF->getContents().size() + 4, 0);
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}
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void MCWinCOFFStreamer::EmitELFSize(MCSymbol *Symbol, const MCExpr *Value) {
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llvm_unreachable("not supported");
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}
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void MCWinCOFFStreamer::EmitCommonSymbol(MCSymbol *Symbol, uint64_t Size,
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unsigned ByteAlignment) {
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assert((!Symbol->isInSection() ||
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Symbol->getSection().getVariant() == MCSection::SV_COFF) &&
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"Got non-COFF section in the COFF backend!");
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const Triple &T = getContext().getObjectFileInfo()->getTargetTriple();
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if (T.isKnownWindowsMSVCEnvironment()) {
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if (ByteAlignment > 32)
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report_fatal_error("alignment is limited to 32-bytes");
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// Round size up to alignment so that we will honor the alignment request.
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Size = std::max(Size, static_cast<uint64_t>(ByteAlignment));
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}
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AssignSection(Symbol, nullptr);
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MCSymbolData &SD = getAssembler().getOrCreateSymbolData(*Symbol);
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SD.setExternal(true);
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SD.setCommon(Size, ByteAlignment);
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if (!T.isKnownWindowsMSVCEnvironment() && ByteAlignment > 1) {
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SmallString<128> Directive;
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raw_svector_ostream OS(Directive);
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const MCObjectFileInfo *MFI = getContext().getObjectFileInfo();
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OS << " -aligncomm:\"" << Symbol->getName() << "\","
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<< Log2_32_Ceil(ByteAlignment);
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OS.flush();
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PushSection();
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SwitchSection(MFI->getDrectveSection());
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EmitBytes(Directive);
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PopSection();
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}
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}
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void MCWinCOFFStreamer::EmitLocalCommonSymbol(MCSymbol *Symbol, uint64_t Size,
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unsigned ByteAlignment) {
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assert(!Symbol->isInSection() && "Symbol must not already have a section!");
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const MCSection *Section = getContext().getObjectFileInfo()->getBSSSection();
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MCSectionData &SectionData = getAssembler().getOrCreateSectionData(*Section);
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if (SectionData.getAlignment() < ByteAlignment)
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SectionData.setAlignment(ByteAlignment);
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MCSymbolData &SD = getAssembler().getOrCreateSymbolData(*Symbol);
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SD.setExternal(false);
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AssignSection(Symbol, Section);
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if (ByteAlignment != 1)
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new MCAlignFragment(ByteAlignment, /*_Value=*/0, /*_ValueSize=*/0,
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ByteAlignment, &SectionData);
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MCFillFragment *Fragment =
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new MCFillFragment(/*_Value=*/0, /*_ValueSize=*/0, Size, &SectionData);
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SD.setFragment(Fragment);
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}
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void MCWinCOFFStreamer::EmitZerofill(const MCSection *Section,
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MCSymbol *Symbol, uint64_t Size,
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unsigned ByteAlignment) {
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llvm_unreachable("not implemented");
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}
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void MCWinCOFFStreamer::EmitTBSSSymbol(const MCSection *Section,
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MCSymbol *Symbol, uint64_t Size,
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unsigned ByteAlignment) {
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llvm_unreachable("not implemented");
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}
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void MCWinCOFFStreamer::EmitFileDirective(StringRef Filename) {
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getAssembler().addFileName(Filename);
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}
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// TODO: Implement this if you want to emit .comment section in COFF obj files.
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void MCWinCOFFStreamer::EmitIdent(StringRef IdentString) {
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llvm_unreachable("not implemented");
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}
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void MCWinCOFFStreamer::EmitWinEHHandlerData() {
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llvm_unreachable("not implemented");
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}
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void MCWinCOFFStreamer::FinishImpl() {
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MCObjectStreamer::FinishImpl();
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}
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LLVM_ATTRIBUTE_NORETURN
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void MCWinCOFFStreamer::FatalError(const Twine &Msg) const {
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getContext().FatalError(SMLoc(), Msg);
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}
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}
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