mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-07-22 09:29:31 +00:00
030f63a397
The aim of this patch is to fix the following piece of code in the
platform-independent AsmParser:
void AsmParser::CheckForValidSection() {
if (!ParsingInlineAsm && !getStreamer().getCurrentSection()) {
TokError("expected section directive before assembly directive");
Out.SwitchSection(Ctx.getMachOSection(
"__TEXT", "__text",
MCSectionMachO::S_ATTR_PURE_INSTRUCTIONS,
0, SectionKind::getText()));
}
}
This was added for the "-n" option of llvm-mc.
The proposed fix adds another virtual method to MCStreamer, called
InitToTextSection. Conceptually, it's similar to the existing
InitSections which initializes all common sections and switches to
text. The new method is implemented by each platform streamer in a way
that it sees fit. So AsmParser can now do this:
void AsmParser::CheckForValidSection() {
if (!ParsingInlineAsm && !getStreamer().getCurrentSection()) {
TokError("expected section directive before assembly directive");
Out.InitToTextSection();
}
}
Which is much more reasonable.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@172450 91177308-0d34-0410-b5e6-96231b3b80d8
375 lines
13 KiB
C++
375 lines
13 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 Win32 COFF object file streamer.
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//
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//===----------------------------------------------------------------------===//
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#define DEBUG_TYPE "WinCOFFStreamer"
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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/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/MCWin64EH.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/TargetRegistry.h"
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#include "llvm/Support/raw_ostream.h"
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using namespace llvm;
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namespace {
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class WinCOFFStreamer : public MCObjectStreamer {
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public:
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MCSymbol const *CurSymbol;
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WinCOFFStreamer(MCContext &Context,
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MCAsmBackend &MAB,
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MCCodeEmitter &CE,
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raw_ostream &OS);
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void AddCommonSymbol(MCSymbol *Symbol, uint64_t Size,
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unsigned ByteAlignment, bool External);
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// MCStreamer interface
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virtual void InitSections();
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virtual void InitToTextSection();
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virtual void EmitLabel(MCSymbol *Symbol);
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virtual void EmitDebugLabel(MCSymbol *Symbol);
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virtual void EmitAssemblerFlag(MCAssemblerFlag Flag);
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virtual void EmitThumbFunc(MCSymbol *Func);
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virtual void EmitAssignment(MCSymbol *Symbol, const MCExpr *Value);
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virtual void EmitSymbolAttribute(MCSymbol *Symbol, MCSymbolAttr Attribute);
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virtual void EmitSymbolDesc(MCSymbol *Symbol, unsigned DescValue);
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virtual void BeginCOFFSymbolDef(MCSymbol const *Symbol);
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virtual void EmitCOFFSymbolStorageClass(int StorageClass);
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virtual void EmitCOFFSymbolType(int Type);
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virtual void EndCOFFSymbolDef();
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virtual void EmitCOFFSecRel32(MCSymbol const *Symbol);
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virtual void EmitELFSize(MCSymbol *Symbol, const MCExpr *Value);
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virtual void EmitCommonSymbol(MCSymbol *Symbol, uint64_t Size,
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unsigned ByteAlignment);
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virtual void EmitLocalCommonSymbol(MCSymbol *Symbol, uint64_t Size,
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unsigned ByteAlignment);
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virtual void EmitZerofill(const MCSection *Section, MCSymbol *Symbol,
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uint64_t Size,unsigned ByteAlignment);
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virtual void EmitTBSSSymbol(const MCSection *Section, MCSymbol *Symbol,
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uint64_t Size, unsigned ByteAlignment);
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virtual void EmitFileDirective(StringRef Filename);
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virtual void EmitWin64EHHandlerData();
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virtual void FinishImpl();
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private:
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virtual void EmitInstToData(const MCInst &Inst) {
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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);
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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 SetSection(StringRef Section,
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unsigned Characteristics,
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SectionKind Kind) {
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SwitchSection(getContext().getCOFFSection(Section, Characteristics, Kind));
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}
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void SetSectionText() {
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SetSection(".text",
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COFF::IMAGE_SCN_CNT_CODE
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| COFF::IMAGE_SCN_MEM_EXECUTE
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| COFF::IMAGE_SCN_MEM_READ,
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SectionKind::getText());
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EmitCodeAlignment(4, 0);
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}
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void SetSectionData() {
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SetSection(".data",
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COFF::IMAGE_SCN_CNT_INITIALIZED_DATA
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| COFF::IMAGE_SCN_MEM_READ
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| COFF::IMAGE_SCN_MEM_WRITE,
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SectionKind::getDataRel());
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EmitCodeAlignment(4, 0);
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}
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void SetSectionBSS() {
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SetSection(".bss",
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COFF::IMAGE_SCN_CNT_UNINITIALIZED_DATA
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| COFF::IMAGE_SCN_MEM_READ
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| COFF::IMAGE_SCN_MEM_WRITE,
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SectionKind::getBSS());
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EmitCodeAlignment(4, 0);
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}
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};
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} // end anonymous namespace.
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WinCOFFStreamer::WinCOFFStreamer(MCContext &Context,
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MCAsmBackend &MAB,
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MCCodeEmitter &CE,
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raw_ostream &OS)
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: MCObjectStreamer(Context, MAB, OS, &CE)
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, CurSymbol(NULL) {
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}
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void WinCOFFStreamer::AddCommonSymbol(MCSymbol *Symbol, uint64_t Size,
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unsigned ByteAlignment, bool External) {
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assert(!Symbol->isInSection() && "Symbol must not already have a section!");
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std::string SectionName(".bss$linkonce");
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SectionName.append(Symbol->getName().begin(), Symbol->getName().end());
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MCSymbolData &SymbolData = getAssembler().getOrCreateSymbolData(*Symbol);
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unsigned Characteristics =
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COFF::IMAGE_SCN_LNK_COMDAT |
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COFF::IMAGE_SCN_CNT_UNINITIALIZED_DATA |
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COFF::IMAGE_SCN_MEM_READ |
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COFF::IMAGE_SCN_MEM_WRITE;
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int Selection = COFF::IMAGE_COMDAT_SELECT_LARGEST;
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const MCSection *Section = MCStreamer::getContext().getCOFFSection(
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SectionName, Characteristics, Selection, SectionKind::getBSS());
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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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SymbolData.setExternal(External);
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Symbol->setSection(*Section);
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if (ByteAlignment != 1)
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new MCAlignFragment(ByteAlignment, 0, 0, ByteAlignment, &SectionData);
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SymbolData.setFragment(new MCFillFragment(0, 0, Size, &SectionData));
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}
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// MCStreamer interface
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void WinCOFFStreamer::InitToTextSection() {
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SetSectionText();
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}
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void WinCOFFStreamer::InitSections() {
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SetSectionText();
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SetSectionData();
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SetSectionBSS();
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SetSectionText();
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}
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void WinCOFFStreamer::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 WinCOFFStreamer::EmitDebugLabel(MCSymbol *Symbol) {
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EmitLabel(Symbol);
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}
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void WinCOFFStreamer::EmitAssemblerFlag(MCAssemblerFlag Flag) {
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llvm_unreachable("not implemented");
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}
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void WinCOFFStreamer::EmitThumbFunc(MCSymbol *Func) {
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llvm_unreachable("not implemented");
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}
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void WinCOFFStreamer::EmitAssignment(MCSymbol *Symbol, const MCExpr *Value) {
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assert((Symbol->isInSection()
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? Symbol->getSection().getVariant() == MCSection::SV_COFF
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: true) && "Got non COFF section in the COFF backend!");
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// FIXME: This is all very ugly and depressing. What needs to happen here
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// depends on quite a few things that are all part of relaxation, which we
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// don't really even do.
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if (Value->getKind() != MCExpr::SymbolRef) {
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MCObjectStreamer::EmitAssignment(Symbol, Value);
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} else {
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// FIXME: This is a horrible way to do this :(. This should really be
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// handled after we are done with the MC* objects and immediately before
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// writing out the object file when we know exactly what the symbol should
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// look like in the coff symbol table. I'm not doing that now because the
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// COFF object writer doesn't have a clearly defined separation between MC
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// data structures, the object writers data structures, and the raw, POD,
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// data structures that get written to disk.
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// Copy over the aliased data.
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MCSymbolData &SD = getAssembler().getOrCreateSymbolData(*Symbol);
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const MCSymbolData &RealSD = getAssembler().getOrCreateSymbolData(
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dyn_cast<const MCSymbolRefExpr>(Value)->getSymbol());
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// FIXME: This is particularly nasty because it breaks as soon as any data
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// members of MCSymbolData change.
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SD.CommonAlign = RealSD.CommonAlign;
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SD.CommonSize = RealSD.CommonSize;
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SD.Flags = RealSD.Flags;
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SD.Fragment = RealSD.Fragment;
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SD.Index = RealSD.Index;
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SD.IsExternal = RealSD.IsExternal;
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SD.IsPrivateExtern = RealSD.IsPrivateExtern;
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SD.Offset = RealSD.Offset;
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SD.SymbolSize = RealSD.SymbolSize;
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}
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}
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void WinCOFFStreamer::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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: true) && "Got non COFF section in the COFF backend!");
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switch (Attribute) {
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case MCSA_WeakReference:
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case MCSA_Weak: {
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MCSymbolData &SD = getAssembler().getOrCreateSymbolData(*Symbol);
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SD.modifyFlags(COFF::SF_WeakExternal, COFF::SF_WeakExternal);
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SD.setExternal(true);
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}
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break;
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case MCSA_Global:
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getAssembler().getOrCreateSymbolData(*Symbol).setExternal(true);
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break;
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default:
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llvm_unreachable("unsupported attribute");
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}
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}
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void WinCOFFStreamer::EmitSymbolDesc(MCSymbol *Symbol, unsigned DescValue) {
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llvm_unreachable("not implemented");
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}
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void WinCOFFStreamer::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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: true) && "Got non COFF section in the COFF backend!");
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assert(CurSymbol == NULL && "EndCOFFSymbolDef must be called between calls "
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"to BeginCOFFSymbolDef!");
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CurSymbol = Symbol;
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}
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void WinCOFFStreamer::EmitCOFFSymbolStorageClass(int StorageClass) {
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assert(CurSymbol != NULL && "BeginCOFFSymbolDef must be called first!");
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assert((StorageClass & ~0xFF) == 0 && "StorageClass must only have data in "
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"the first byte!");
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getAssembler().getOrCreateSymbolData(*CurSymbol).modifyFlags(
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StorageClass << COFF::SF_ClassShift,
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COFF::SF_ClassMask);
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}
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void WinCOFFStreamer::EmitCOFFSymbolType(int Type) {
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assert(CurSymbol != NULL && "BeginCOFFSymbolDef must be called first!");
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assert((Type & ~0xFFFF) == 0 && "Type must only have data in the first 2 "
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"bytes");
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getAssembler().getOrCreateSymbolData(*CurSymbol).modifyFlags(
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Type << COFF::SF_TypeShift,
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COFF::SF_TypeMask);
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}
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void WinCOFFStreamer::EndCOFFSymbolDef() {
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assert(CurSymbol != NULL && "BeginCOFFSymbolDef must be called first!");
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CurSymbol = NULL;
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}
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void WinCOFFStreamer::EmitCOFFSecRel32(MCSymbol const *Symbol)
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{
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MCDataFragment *DF = getOrCreateDataFragment();
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DF->getFixups().push_back(
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MCFixup::Create(DF->getContents().size(),
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MCSymbolRefExpr::Create (Symbol, getContext ()),
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FK_SecRel_4));
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DF->getContents().resize(DF->getContents().size() + 4, 0);
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}
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void WinCOFFStreamer::EmitELFSize(MCSymbol *Symbol, const MCExpr *Value) {
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llvm_unreachable("not implemented");
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}
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void WinCOFFStreamer::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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: true) && "Got non COFF section in the COFF backend!");
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AddCommonSymbol(Symbol, Size, ByteAlignment, true);
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}
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void WinCOFFStreamer::EmitLocalCommonSymbol(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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: true) && "Got non COFF section in the COFF backend!");
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AddCommonSymbol(Symbol, Size, ByteAlignment, false);
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}
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void WinCOFFStreamer::EmitZerofill(const 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 WinCOFFStreamer::EmitTBSSSymbol(const 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 WinCOFFStreamer::EmitFileDirective(StringRef Filename) {
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// Ignore for now, linkers don't care, and proper debug
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// info will be a much large effort.
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}
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void WinCOFFStreamer::EmitWin64EHHandlerData() {
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MCStreamer::EmitWin64EHHandlerData();
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// We have to emit the unwind info now, because this directive
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// actually switches to the .xdata section!
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MCWin64EHUnwindEmitter::EmitUnwindInfo(*this, getCurrentW64UnwindInfo());
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}
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void WinCOFFStreamer::FinishImpl() {
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EmitW64Tables();
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MCObjectStreamer::FinishImpl();
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}
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namespace llvm
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{
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MCStreamer *createWinCOFFStreamer(MCContext &Context,
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MCAsmBackend &MAB,
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MCCodeEmitter &CE,
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raw_ostream &OS,
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bool RelaxAll) {
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WinCOFFStreamer *S = new WinCOFFStreamer(Context, MAB, CE, OS);
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S->getAssembler().setRelaxAll(RelaxAll);
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return S;
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}
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}
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