mirror of
https://github.com/c64scene-ar/llvm-6502.git
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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@115795 91177308-0d34-0410-b5e6-96231b3b80d8
514 lines
18 KiB
C++
514 lines
18 KiB
C++
//===- lib/MC/MCELFStreamer.cpp - ELF 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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//
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// This file assembles .s files and emits ELF .o object files.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/MC/MCStreamer.h"
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#include "llvm/ADT/SmallPtrSet.h"
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#include "llvm/MC/MCAssembler.h"
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#include "llvm/MC/MCContext.h"
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#include "llvm/MC/MCCodeEmitter.h"
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#include "llvm/MC/MCELFSymbolFlags.h"
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#include "llvm/MC/MCExpr.h"
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#include "llvm/MC/MCInst.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/MCSectionELF.h"
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#include "llvm/MC/MCSymbol.h"
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#include "llvm/Support/Debug.h"
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#include "llvm/Support/ELF.h"
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#include "llvm/Support/ErrorHandling.h"
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#include "llvm/Support/raw_ostream.h"
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#include "llvm/Target/TargetAsmBackend.h"
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using namespace llvm;
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namespace {
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class MCELFStreamer : public MCObjectStreamer {
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void EmitInstToFragment(const MCInst &Inst);
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void EmitInstToData(const MCInst &Inst);
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public:
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MCELFStreamer(MCContext &Context, TargetAsmBackend &TAB,
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raw_ostream &OS, MCCodeEmitter *Emitter)
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: MCObjectStreamer(Context, TAB, OS, Emitter, false) {}
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~MCELFStreamer() {}
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/// @name MCStreamer Interface
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/// @{
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virtual void InitSections();
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virtual void EmitLabel(MCSymbol *Symbol);
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virtual void EmitAssemblerFlag(MCAssemblerFlag Flag);
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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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assert(0 && "ELF doesn't support this directive");
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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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virtual void BeginCOFFSymbolDef(const MCSymbol *Symbol) {
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assert(0 && "ELF doesn't support this directive");
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}
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virtual void EmitCOFFSymbolStorageClass(int StorageClass) {
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assert(0 && "ELF doesn't support this directive");
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}
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virtual void EmitCOFFSymbolType(int Type) {
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assert(0 && "ELF doesn't support this directive");
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}
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virtual void EndCOFFSymbolDef() {
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assert(0 && "ELF doesn't support this directive");
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}
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virtual void EmitELFSize(MCSymbol *Symbol, const MCExpr *Value) {
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MCSymbolData &SD = getAssembler().getOrCreateSymbolData(*Symbol);
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SD.setSize(Value);
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}
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virtual void EmitLocalCommonSymbol(MCSymbol *Symbol, uint64_t Size) {
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assert(0 && "ELF doesn't support this directive");
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}
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virtual void EmitZerofill(const MCSection *Section, MCSymbol *Symbol = 0,
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unsigned Size = 0, unsigned ByteAlignment = 0) {
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assert(0 && "ELF doesn't support this directive");
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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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assert(0 && "ELF doesn't support this directive");
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}
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virtual void EmitBytes(StringRef Data, unsigned AddrSpace);
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virtual void EmitValue(const MCExpr *Value, unsigned Size,unsigned AddrSpace);
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virtual void EmitGPRel32Value(const MCExpr *Value) {
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assert(0 && "ELF doesn't support this directive");
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}
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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 void EmitValueToOffset(const MCExpr *Offset,
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unsigned char Value = 0);
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virtual void EmitFileDirective(StringRef Filename);
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virtual void EmitDwarfFileDirective(unsigned FileNo, StringRef Filename) {
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DEBUG(dbgs() << "FIXME: MCELFStreamer:EmitDwarfFileDirective not implemented\n");
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}
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virtual void EmitInstruction(const MCInst &Inst);
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virtual void Finish();
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private:
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struct LocalCommon {
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MCSymbolData *SD;
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uint64_t Size;
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unsigned ByteAlignment;
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};
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std::vector<LocalCommon> LocalCommons;
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SmallPtrSet<MCSymbol *, 16> BindingExplicitlySet;
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/// @}
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void SetSection(StringRef Section, unsigned Type, unsigned Flags,
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SectionKind Kind) {
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SwitchSection(getContext().getELFSection(Section, Type, Flags, Kind));
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}
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void SetSectionData() {
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SetSection(".data", MCSectionELF::SHT_PROGBITS,
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MCSectionELF::SHF_WRITE |MCSectionELF::SHF_ALLOC,
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SectionKind::getDataRel());
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EmitCodeAlignment(4, 0);
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}
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void SetSectionText() {
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SetSection(".text", MCSectionELF::SHT_PROGBITS,
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MCSectionELF::SHF_EXECINSTR |
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MCSectionELF::SHF_ALLOC, SectionKind::getText());
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EmitCodeAlignment(4, 0);
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}
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void SetSectionBss() {
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SetSection(".bss", MCSectionELF::SHT_NOBITS,
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MCSectionELF::SHF_WRITE |
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MCSectionELF::SHF_ALLOC, 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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void MCELFStreamer::InitSections() {
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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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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 MCELFStreamer::EmitLabel(MCSymbol *Symbol) {
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assert(Symbol->isUndefined() && "Cannot define a symbol twice!");
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Symbol->setSection(*CurSection);
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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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void MCELFStreamer::EmitAssemblerFlag(MCAssemblerFlag Flag) {
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switch (Flag) {
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case MCAF_SyntaxUnified: return; // no-op here?
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case MCAF_SubsectionsViaSymbols:
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getAssembler().setSubsectionsViaSymbols(true);
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return;
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}
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assert(0 && "invalid assembler flag!");
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}
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void MCELFStreamer::EmitAssignment(MCSymbol *Symbol, const MCExpr *Value) {
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// TODO: This is exactly the same as WinCOFFStreamer. Consider merging into
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// MCObjectStreamer.
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// FIXME: Lift context changes into super class.
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getAssembler().getOrCreateSymbolData(*Symbol);
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Symbol->setVariableValue(AddValueSymbols(Value));
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}
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static void SetBinding(MCSymbolData &SD, unsigned Binding) {
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assert(Binding == ELF::STB_LOCAL || Binding == ELF::STB_GLOBAL ||
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Binding == ELF::STB_WEAK);
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uint32_t OtherFlags = SD.getFlags() & ~(0xf << ELF_STB_Shift);
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SD.setFlags(OtherFlags | (Binding << ELF_STB_Shift));
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}
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static unsigned GetBinding(const MCSymbolData &SD) {
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uint32_t Binding = (SD.getFlags() & (0xf << ELF_STB_Shift)) >> ELF_STB_Shift;
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assert(Binding == ELF::STB_LOCAL || Binding == ELF::STB_GLOBAL ||
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Binding == ELF::STB_WEAK);
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return Binding;
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}
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static void SetType(MCSymbolData &SD, unsigned Type) {
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assert(Type == ELF::STT_NOTYPE || Type == ELF::STT_OBJECT ||
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Type == ELF::STT_FUNC || Type == ELF::STT_SECTION ||
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Type == ELF::STT_FILE || Type == ELF::STT_COMMON ||
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Type == ELF::STT_TLS);
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uint32_t OtherFlags = SD.getFlags() & ~(0xf << ELF_STT_Shift);
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SD.setFlags(OtherFlags | (Type << ELF_STT_Shift));
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}
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static void SetVisibility(MCSymbolData &SD, unsigned Visibility) {
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assert(Visibility == ELF::STV_DEFAULT || Visibility == ELF::STV_INTERNAL ||
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Visibility == ELF::STV_HIDDEN || Visibility == ELF::STV_PROTECTED);
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uint32_t OtherFlags = SD.getFlags() & ~(0xf << ELF_STV_Shift);
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SD.setFlags(OtherFlags | (Visibility << ELF_STV_Shift));
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}
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void MCELFStreamer::EmitSymbolAttribute(MCSymbol *Symbol,
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MCSymbolAttr Attribute) {
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// Indirect symbols are handled differently, to match how 'as' handles
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// them. This makes writing matching .o files easier.
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if (Attribute == MCSA_IndirectSymbol) {
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// Note that we intentionally cannot use the symbol data here; this is
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// important for matching the string table that 'as' generates.
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IndirectSymbolData ISD;
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ISD.Symbol = Symbol;
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ISD.SectionData = getCurrentSectionData();
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getAssembler().getIndirectSymbols().push_back(ISD);
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return;
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}
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// Adding a symbol attribute always introduces the symbol, note that an
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// important side effect of calling getOrCreateSymbolData here is to register
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// the symbol with the assembler.
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MCSymbolData &SD = getAssembler().getOrCreateSymbolData(*Symbol);
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// The implementation of symbol attributes is designed to match 'as', but it
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// leaves much to desired. It doesn't really make sense to arbitrarily add and
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// remove flags, but 'as' allows this (in particular, see .desc).
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//
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// In the future it might be worth trying to make these operations more well
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// defined.
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switch (Attribute) {
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case MCSA_LazyReference:
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case MCSA_Reference:
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case MCSA_NoDeadStrip:
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case MCSA_PrivateExtern:
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case MCSA_WeakDefinition:
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case MCSA_WeakDefAutoPrivate:
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case MCSA_Invalid:
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case MCSA_ELF_TypeIndFunction:
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case MCSA_IndirectSymbol:
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assert(0 && "Invalid symbol attribute for ELF!");
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break;
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case MCSA_Global:
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SetBinding(SD, ELF::STB_GLOBAL);
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SD.setExternal(true);
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BindingExplicitlySet.insert(Symbol);
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break;
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case MCSA_WeakReference:
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case MCSA_Weak:
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SetBinding(SD, ELF::STB_WEAK);
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SD.setExternal(true);
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BindingExplicitlySet.insert(Symbol);
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break;
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case MCSA_Local:
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SetBinding(SD, ELF::STB_LOCAL);
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SD.setExternal(false);
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BindingExplicitlySet.insert(Symbol);
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break;
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case MCSA_ELF_TypeFunction:
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SetType(SD, ELF::STT_FUNC);
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break;
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case MCSA_ELF_TypeObject:
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SetType(SD, ELF::STT_OBJECT);
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break;
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case MCSA_ELF_TypeTLS:
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SetType(SD, ELF::STT_TLS);
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break;
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case MCSA_ELF_TypeCommon:
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SetType(SD, ELF::STT_COMMON);
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break;
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case MCSA_ELF_TypeNoType:
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SetType(SD, ELF::STT_NOTYPE);
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break;
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case MCSA_Protected:
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SetVisibility(SD, ELF::STV_PROTECTED);
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break;
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case MCSA_Hidden:
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SetVisibility(SD, ELF::STV_HIDDEN);
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break;
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case MCSA_Internal:
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SetVisibility(SD, ELF::STV_INTERNAL);
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break;
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}
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}
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void MCELFStreamer::EmitCommonSymbol(MCSymbol *Symbol, uint64_t Size,
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unsigned ByteAlignment) {
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MCSymbolData &SD = getAssembler().getOrCreateSymbolData(*Symbol);
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if (!BindingExplicitlySet.count(Symbol)) {
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SetBinding(SD, ELF::STB_GLOBAL);
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SD.setExternal(true);
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}
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if (GetBinding(SD) == ELF_STB_Local) {
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const MCSection *Section = getAssembler().getContext().getELFSection(".bss",
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MCSectionELF::SHT_NOBITS,
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MCSectionELF::SHF_WRITE |
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MCSectionELF::SHF_ALLOC,
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SectionKind::getBSS());
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Symbol->setSection(*Section);
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struct LocalCommon L = {&SD, Size, ByteAlignment};
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LocalCommons.push_back(L);
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} else {
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SD.setCommon(Size, ByteAlignment);
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}
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SD.setSize(MCConstantExpr::Create(Size, getContext()));
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}
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void MCELFStreamer::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 MCELFStreamer::EmitValue(const MCExpr *Value, unsigned Size,
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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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MCDataFragment *DF = getOrCreateDataFragment();
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// Avoid fixups when possible.
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int64_t AbsValue;
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if (AddValueSymbols(Value)->EvaluateAsAbsolute(AbsValue)) {
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// FIXME: Endianness assumption.
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for (unsigned i = 0; i != Size; ++i)
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DF->getContents().push_back(uint8_t(AbsValue >> (i * 8)));
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} else {
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DF->addFixup(MCFixup::Create(DF->getContents().size(), AddValueSymbols(Value),
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MCFixup::getKindForSize(Size)));
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DF->getContents().resize(DF->getContents().size() + Size, 0);
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}
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}
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void MCELFStreamer::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 MCELFStreamer::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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void MCELFStreamer::EmitValueToOffset(const MCExpr *Offset,
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unsigned char Value) {
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// TODO: This is exactly the same as MCMachOStreamer. Consider merging into
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// MCObjectStreamer.
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new MCOrgFragment(*Offset, Value, getCurrentSectionData());
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}
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// Add a symbol for the file name of this module. This is the second
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// entry in the module's symbol table (the first being the null symbol).
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void MCELFStreamer::EmitFileDirective(StringRef Filename) {
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MCSymbol *Symbol = getAssembler().getContext().GetOrCreateSymbol(Filename);
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Symbol->setSection(*CurSection);
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Symbol->setAbsolute();
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MCSymbolData &SD = getAssembler().getOrCreateSymbolData(*Symbol);
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SD.setFlags(ELF_STT_File | ELF_STB_Local | ELF_STV_Default);
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}
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void MCELFStreamer::EmitInstToFragment(const MCInst &Inst) {
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MCInstFragment *IF = new MCInstFragment(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->getCode() = Code;
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IF->getFixups() = Fixups;
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}
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void MCELFStreamer::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->addFixup(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 MCELFStreamer::EmitInstruction(const MCInst &Inst) {
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// Scan for values.
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for (unsigned i = 0; 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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getCurrentSectionData()->setHasInstructions(true);
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// If this instruction doesn't need relaxation, just emit it as data.
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if (!getAssembler().getBackend().MayNeedRelaxation(Inst)) {
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EmitInstToData(Inst);
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return;
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}
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// Otherwise, if we are relaxing everything, relax the instruction as much as
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// possible and emit it as data.
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if (getAssembler().getRelaxAll()) {
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MCInst Relaxed;
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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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EmitInstToData(Relaxed);
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return;
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}
|
|
|
|
// Otherwise emit to a separate fragment.
|
|
EmitInstToFragment(Inst);
|
|
}
|
|
|
|
void MCELFStreamer::Finish() {
|
|
for (std::vector<LocalCommon>::const_iterator i = LocalCommons.begin(),
|
|
e = LocalCommons.end();
|
|
i != e; ++i) {
|
|
MCSymbolData *SD = i->SD;
|
|
uint64_t Size = i->Size;
|
|
unsigned ByteAlignment = i->ByteAlignment;
|
|
const MCSymbol &Symbol = SD->getSymbol();
|
|
const MCSection &Section = Symbol.getSection();
|
|
|
|
MCSectionData &SectData = getAssembler().getOrCreateSectionData(Section);
|
|
new MCAlignFragment(ByteAlignment, 0, 1, ByteAlignment, &SectData);
|
|
|
|
MCFragment *F = new MCFillFragment(0, 0, Size, &SectData);
|
|
SD->setFragment(F);
|
|
|
|
// Update the maximum alignment of the section if necessary.
|
|
if (ByteAlignment > SectData.getAlignment())
|
|
SectData.setAlignment(ByteAlignment);
|
|
}
|
|
|
|
this->MCObjectStreamer::Finish();
|
|
}
|
|
|
|
MCStreamer *llvm::createELFStreamer(MCContext &Context, TargetAsmBackend &TAB,
|
|
raw_ostream &OS, MCCodeEmitter *CE,
|
|
bool RelaxAll) {
|
|
MCELFStreamer *S = new MCELFStreamer(Context, TAB, OS, CE);
|
|
if (RelaxAll)
|
|
S->getAssembler().setRelaxAll(true);
|
|
return S;
|
|
}
|