mirror of
https://github.com/c64scene-ar/llvm-6502.git
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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
239 lines
8.8 KiB
C++
239 lines
8.8 KiB
C++
//===- lib/MC/MCPureStreamer.cpp - MC "Pure" Object Output ----------------===//
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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/MCStreamer.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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// FIXME: Remove this.
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#include "llvm/MC/MCSectionMachO.h"
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#include "llvm/MC/MCSymbol.h"
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#include "llvm/Support/ErrorHandling.h"
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using namespace llvm;
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namespace {
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class MCPureStreamer : public MCObjectStreamer {
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private:
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virtual void EmitInstToFragment(const MCInst &Inst);
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virtual void EmitInstToData(const MCInst &Inst);
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public:
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MCPureStreamer(MCContext &Context, MCAsmBackend &TAB,
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raw_ostream &OS, MCCodeEmitter *Emitter)
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: MCObjectStreamer(Context, TAB, OS, Emitter) {}
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/// @name MCStreamer Interface
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/// @{
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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 EmitZerofill(const MCSection *Section, MCSymbol *Symbol = 0,
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uint64_t Size = 0, unsigned ByteAlignment = 0);
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virtual void EmitBytes(StringRef Data, unsigned AddrSpace);
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virtual void EmitValueToAlignment(unsigned ByteAlignment, int64_t Value = 0,
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unsigned ValueSize = 1,
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unsigned MaxBytesToEmit = 0);
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virtual void EmitCodeAlignment(unsigned ByteAlignment,
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unsigned MaxBytesToEmit = 0);
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virtual bool EmitValueToOffset(const MCExpr *Offset,
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unsigned char Value = 0);
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virtual void FinishImpl();
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virtual void EmitSymbolAttribute(MCSymbol *Symbol, MCSymbolAttr Attribute) {
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report_fatal_error("unsupported directive in pure streamer");
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}
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virtual void EmitAssemblerFlag(MCAssemblerFlag Flag) {
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report_fatal_error("unsupported directive in pure streamer");
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}
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virtual void EmitTBSSSymbol(const MCSection *Section, MCSymbol *Symbol,
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uint64_t Size, unsigned ByteAlignment = 0) {
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report_fatal_error("unsupported directive in pure streamer");
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}
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virtual void EmitSymbolDesc(MCSymbol *Symbol, unsigned DescValue) {
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report_fatal_error("unsupported directive in pure streamer");
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}
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virtual void EmitCommonSymbol(MCSymbol *Symbol, uint64_t Size,
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unsigned ByteAlignment) {
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report_fatal_error("unsupported directive in pure streamer");
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}
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virtual void EmitThumbFunc(MCSymbol *Func) {
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report_fatal_error("unsupported directive in pure streamer");
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}
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virtual void BeginCOFFSymbolDef(const MCSymbol *Symbol) {
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report_fatal_error("unsupported directive in pure streamer");
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}
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virtual void EmitCOFFSymbolStorageClass(int StorageClass) {
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report_fatal_error("unsupported directive in pure streamer");
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}
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virtual void EmitCOFFSymbolType(int Type) {
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report_fatal_error("unsupported directive in pure streamer");
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}
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virtual void EndCOFFSymbolDef() {
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report_fatal_error("unsupported directive in pure streamer");
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}
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virtual void EmitELFSize(MCSymbol *Symbol, const MCExpr *Value) {
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report_fatal_error("unsupported directive in pure streamer");
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}
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virtual void EmitLocalCommonSymbol(MCSymbol *Symbol, uint64_t Size,
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unsigned ByteAlignment) {
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report_fatal_error("unsupported directive in pure streamer");
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}
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virtual void EmitFileDirective(StringRef Filename) {
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report_fatal_error("unsupported directive in pure streamer");
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}
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virtual bool EmitDwarfFileDirective(unsigned FileNo, StringRef Directory,
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StringRef Filename) {
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report_fatal_error("unsupported directive in pure streamer");
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}
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/// @}
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};
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} // end anonymous namespace.
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void MCPureStreamer::InitSections() {
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InitToTextSection();
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}
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void MCPureStreamer::InitToTextSection() {
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// FIMXE: To what!?
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SwitchSection(getContext().getMachOSection("__TEXT", "__text",
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MCSectionMachO::S_ATTR_PURE_INSTRUCTIONS,
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0, SectionKind::getText()));
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}
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void MCPureStreamer::EmitLabel(MCSymbol *Symbol) {
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assert(Symbol->isUndefined() && "Cannot define a symbol twice!");
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assert(!Symbol->isVariable() && "Cannot emit a variable symbol!");
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assert(getCurrentSection() && "Cannot emit before setting section!");
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Symbol->setSection(*getCurrentSection());
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MCSymbolData &SD = getAssembler().getOrCreateSymbolData(*Symbol);
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// We have to create a new fragment if this is an atom defining symbol,
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// fragments cannot span atoms.
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if (getAssembler().isSymbolLinkerVisible(SD.getSymbol()))
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new MCDataFragment(getCurrentSectionData());
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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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void MCPureStreamer::EmitDebugLabel(MCSymbol *Symbol) {
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EmitLabel(Symbol);
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}
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void MCPureStreamer::EmitZerofill(const MCSection *Section, MCSymbol *Symbol,
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uint64_t Size, unsigned ByteAlignment) {
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report_fatal_error("not yet implemented in pure streamer");
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}
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void MCPureStreamer::EmitBytes(StringRef Data, unsigned AddrSpace) {
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// TODO: This is exactly the same as WinCOFFStreamer. Consider merging into
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// MCObjectStreamer.
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getOrCreateDataFragment()->getContents().append(Data.begin(), Data.end());
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}
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void MCPureStreamer::EmitValueToAlignment(unsigned ByteAlignment,
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int64_t Value, unsigned ValueSize,
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unsigned MaxBytesToEmit) {
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// TODO: This is exactly the same as WinCOFFStreamer. Consider merging into
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// MCObjectStreamer.
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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 MCPureStreamer::EmitCodeAlignment(unsigned ByteAlignment,
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unsigned MaxBytesToEmit) {
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// TODO: This is exactly the same as WinCOFFStreamer. Consider merging into
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// MCObjectStreamer.
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if (MaxBytesToEmit == 0)
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MaxBytesToEmit = ByteAlignment;
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MCAlignFragment *F = new MCAlignFragment(ByteAlignment, 0, 1, MaxBytesToEmit,
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getCurrentSectionData());
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F->setEmitNops(true);
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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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bool MCPureStreamer::EmitValueToOffset(const MCExpr *Offset,
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unsigned char Value) {
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new MCOrgFragment(*Offset, Value, getCurrentSectionData());
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return false;
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}
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void MCPureStreamer::EmitInstToFragment(const MCInst &Inst) {
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MCRelaxableFragment *IF =
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new MCRelaxableFragment(Inst, getCurrentSectionData());
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// Add the fixups and data.
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//
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// FIXME: Revisit this design decision when relaxation is done, we may be
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// able to get away with not storing any extra data in the MCInst.
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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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IF->getContents() = Code;
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IF->getFixups() = Fixups;
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}
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void MCPureStreamer::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 MCPureStreamer::FinishImpl() {
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// FIXME: Handle DWARF tables?
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this->MCObjectStreamer::FinishImpl();
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}
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MCStreamer *llvm::createPureStreamer(MCContext &Context, MCAsmBackend &MAB,
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raw_ostream &OS, MCCodeEmitter *CE) {
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return new MCPureStreamer(Context, MAB, OS, CE);
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}
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