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e538054e6d
Currently, if the assembler encounters an error after parsing (such as an out-of-range fixup), it reports this as a fatal error, and so stops after the first error. However, for most of these there is an obvious way to recover after emitting the error, such as emitting the fixup with a value of zero. This means that we can report on all of the errors in a file, not just the first one. MCContext::reportError records the fact that an error was encountered, so we won't actually emit an object file with the incorrect contents. Differential Revision: http://reviews.llvm.org/D14717 llvm-svn: 253328
297 lines
9.6 KiB
C++
297 lines
9.6 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/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/MCStreamer.h"
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#include "llvm/MC/MCSymbolCOFF.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_pwrite_stream &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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// 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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getAssembler().registerSymbol(*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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cast<MCSymbolCOFF>(Symbol)->setIsWeakExternal();
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Symbol->setExternal(true);
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break;
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case MCSA_Global:
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Symbol->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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Error("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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Error("storage class specified outside of symbol definition");
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return;
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}
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if (StorageClass & ~COFF::SSC_Invalid) {
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Error("storage class value '" + Twine(StorageClass) +
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"' out of range");
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return;
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}
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getAssembler().registerSymbol(*CurSymbol);
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cast<MCSymbolCOFF>(CurSymbol)->setClass((uint16_t)StorageClass);
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}
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void MCWinCOFFStreamer::EmitCOFFSymbolType(int Type) {
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if (!CurSymbol) {
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Error("symbol type specified outside of a symbol definition");
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return;
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}
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if (Type & ~0xffff) {
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Error("type value '" + Twine(Type) + "' out of range");
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return;
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}
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getAssembler().registerSymbol(*CurSymbol);
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cast<MCSymbolCOFF>(CurSymbol)->setType((uint16_t)Type);
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}
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void MCWinCOFFStreamer::EndCOFFSymbolDef() {
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if (!CurSymbol)
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Error("ending symbol definition without starting one");
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CurSymbol = nullptr;
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}
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void MCWinCOFFStreamer::EmitCOFFSafeSEH(MCSymbol const *Symbol) {
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// SafeSEH is a feature specific to 32-bit x86. It does not exist (and is
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// unnecessary) on all platforms which use table-based exception dispatch.
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if (getContext().getObjectFileInfo()->getTargetTriple().getArch() !=
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Triple::x86)
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return;
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const MCSymbolCOFF *CSymbol = cast<MCSymbolCOFF>(Symbol);
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if (CSymbol->isSafeSEH())
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return;
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MCSection *SXData = getContext().getObjectFileInfo()->getSXDataSection();
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getAssembler().registerSection(*SXData);
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if (SXData->getAlignment() < 4)
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SXData->setAlignment(4);
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new MCSafeSEHFragment(Symbol, SXData);
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getAssembler().registerSymbol(*Symbol);
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CSymbol->setIsSafeSEH();
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// The Microsoft linker requires that the symbol type of a handler be
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// function. Go ahead and oblige it here.
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CSymbol->setType(COFF::IMAGE_SYM_DTYPE_FUNCTION
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<< COFF::SCT_COMPLEX_TYPE_SHIFT);
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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::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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getAssembler().registerSymbol(*Symbol);
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Symbol->setExternal(true);
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Symbol->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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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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MCSection *Section = getContext().getObjectFileInfo()->getBSSSection();
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getAssembler().registerSection(*Section);
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if (Section->getAlignment() < ByteAlignment)
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Section->setAlignment(ByteAlignment);
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getAssembler().registerSymbol(*Symbol);
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Symbol->setExternal(false);
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if (ByteAlignment != 1)
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new MCAlignFragment(ByteAlignment, /*Value=*/0, /*ValueSize=*/0,
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ByteAlignment, Section);
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MCFillFragment *Fragment = new MCFillFragment(
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/*Value=*/0, /*ValueSize=*/0, Size, Section);
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Symbol->setFragment(Fragment);
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}
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void MCWinCOFFStreamer::EmitZerofill(MCSection *Section, MCSymbol *Symbol,
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uint64_t Size, unsigned ByteAlignment) {
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llvm_unreachable("not implemented");
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}
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void MCWinCOFFStreamer::EmitTBSSSymbol(MCSection *Section, MCSymbol *Symbol,
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uint64_t Size, 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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void MCWinCOFFStreamer::Error(const Twine &Msg) const {
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getContext().reportError(SMLoc(), Msg);
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}
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}
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