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https://github.com/c64scene-ar/llvm-6502.git
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actuall addresses in a .o file, so it is better to let the MachO writer compute it. This is good for two reasons. First, areas that shouldn't care about addresses now don't have access to it. Second, the layout of each section is independent. I should use this in a subsequent commit to speed it up. Most of the patch is just removing the section address computation. The two interesting parts are the change on how we handle padding in the end of sections and how MachO can get the address of a-b when a and b are in different sections. Since now the expression evaluation normally doesn't know the section address, it will think that a-b needs relocation and let the MachO writer know. Once it has computed the section addresses, it calls back the expression evaluation with the section addresses to resolve these expressions. The remaining problem is the handling of padding. Currently it will create a special alignment fragment at the end. Since that fragment doesn't update the alignment of the section, it needs the real address to be computed. Since now the layout will not compute a-b with a and b in different sections, the only effect that the special alignment fragment has is update the address size of the section. This can also be done by the MachO writer. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@121076 91177308-0d34-0410-b5e6-96231b3b80d8
521 lines
17 KiB
C++
521 lines
17 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/MC/MCValue.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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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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class MCELFStreamer : public MCObjectStreamer {
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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) {}
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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 EmitThumbFunc(MCSymbol *Func);
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virtual void EmitAssignment(MCSymbol *Symbol, const MCExpr *Value);
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virtual void EmitWeakReference(MCSymbol *Alias, const MCSymbol *Symbol);
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virtual void SwitchSection(const MCSection *Section);
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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 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 EmitFileDirective(StringRef Filename);
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virtual void Finish();
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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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void fixSymbolsInTLSFixups(const MCExpr *expr);
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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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MCObjectStreamer::EmitLabel(Symbol);
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const MCSectionELF &Section =
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static_cast<const MCSectionELF&>(Symbol->getSection());
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MCSymbolData &SD = getAssembler().getSymbolData(*Symbol);
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if (Section.getFlags() & MCSectionELF::SHF_TLS)
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SetType(SD, ELF::STT_TLS);
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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_Code16: return; // no-op here.
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case MCAF_Code32: 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::EmitThumbFunc(MCSymbol *Func) {
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// FIXME: Anything needed here to flag the function as thumb?
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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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void MCELFStreamer::SwitchSection(const MCSection *Section) {
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const MCSymbol *Grp = static_cast<const MCSectionELF *>(Section)->getGroup();
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if (Grp)
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getAssembler().getOrCreateSymbolData(*Grp);
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this->MCObjectStreamer::SwitchSection(Section);
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}
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void MCELFStreamer::EmitWeakReference(MCSymbol *Alias, const MCSymbol *Symbol) {
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getAssembler().getOrCreateSymbolData(*Symbol);
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MCSymbolData &AliasSD = getAssembler().getOrCreateSymbolData(*Alias);
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AliasSD.setFlags(AliasSD.getFlags() | ELF_Other_Weakref);
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const MCExpr *Value = MCSymbolRefExpr::Create(Symbol, getContext());
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Alias->setVariableValue(Value);
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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_SymbolResolver:
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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_ELF_TypeGnuUniqueObject:
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// Ignore for now.
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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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SetType(SD, ELF::STT_OBJECT);
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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::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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// 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::fixSymbolsInTLSFixups(const MCExpr *expr) {
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switch (expr->getKind()) {
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case MCExpr::Target: llvm_unreachable("Can't handle target exprs yet!");
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case MCExpr::Constant:
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break;
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case MCExpr::Binary: {
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const MCBinaryExpr *be = cast<MCBinaryExpr>(expr);
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fixSymbolsInTLSFixups(be->getLHS());
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fixSymbolsInTLSFixups(be->getRHS());
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break;
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}
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case MCExpr::SymbolRef: {
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const MCSymbolRefExpr &symRef = *cast<MCSymbolRefExpr>(expr);
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switch (symRef.getKind()) {
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default:
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return;
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case MCSymbolRefExpr::VK_NTPOFF:
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case MCSymbolRefExpr::VK_GOTNTPOFF:
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case MCSymbolRefExpr::VK_TLSGD:
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case MCSymbolRefExpr::VK_TLSLDM:
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case MCSymbolRefExpr::VK_TPOFF:
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case MCSymbolRefExpr::VK_DTPOFF:
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case MCSymbolRefExpr::VK_GOTTPOFF:
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case MCSymbolRefExpr::VK_TLSLD:
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case MCSymbolRefExpr::VK_ARM_TLSGD:
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break;
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}
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MCSymbolData &SD = getAssembler().getOrCreateSymbolData(symRef.getSymbol());
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SetType(SD, ELF::STT_TLS);
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break;
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}
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case MCExpr::Unary:
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fixSymbolsInTLSFixups(cast<MCUnaryExpr>(expr)->getSubExpr());
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break;
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}
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}
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void MCELFStreamer::EmitInstToFragment(const MCInst &Inst) {
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this->MCObjectStreamer::EmitInstToFragment(Inst);
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MCInstFragment &F = *cast<MCInstFragment>(getCurrentFragment());
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for (unsigned i = 0, e = F.getFixups().size(); i != e; ++i)
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fixSymbolsInTLSFixups(F.getFixups()[i].getValue());
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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;
|
|
SmallString<256> Code;
|
|
raw_svector_ostream VecOS(Code);
|
|
getAssembler().getEmitter().EncodeInstruction(Inst, VecOS, Fixups);
|
|
VecOS.flush();
|
|
|
|
for (unsigned i = 0, e = Fixups.size(); i != e; ++i)
|
|
fixSymbolsInTLSFixups(Fixups[i].getValue());
|
|
|
|
// Add the fixups and data.
|
|
for (unsigned i = 0, e = Fixups.size(); i != e; ++i) {
|
|
Fixups[i].setOffset(Fixups[i].getOffset() + DF->getContents().size());
|
|
DF->addFixup(Fixups[i]);
|
|
}
|
|
DF->getContents().append(Code.begin(), Code.end());
|
|
}
|
|
|
|
void MCELFStreamer::Finish() {
|
|
// FIXME: duplicated code with the MachO streamer.
|
|
// Dump out the dwarf file & directory tables and line tables.
|
|
if (getContext().hasDwarfFiles()) {
|
|
const MCSection *DwarfLineSection =
|
|
getContext().getELFSection(".debug_line", 0, 0,
|
|
SectionKind::getDataRelLocal());
|
|
MCDwarfFileTable::Emit(this, DwarfLineSection);
|
|
}
|
|
|
|
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;
|
|
}
|