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https://github.com/c64scene-ar/llvm-6502.git
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duplicate implementations in format-specific streamers. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@169613 91177308-0d34-0410-b5e6-96231b3b80d8
427 lines
14 KiB
C++
427 lines
14 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/MCELFStreamer.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/MCCodeEmitter.h"
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#include "llvm/MC/MCContext.h"
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#include "llvm/MC/MCELF.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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using namespace llvm;
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inline void MCELFStreamer::SetSection(StringRef Section, unsigned Type,
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unsigned Flags, SectionKind Kind) {
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SwitchSection(getContext().getELFSection(Section, Type, Flags, Kind));
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}
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inline void MCELFStreamer::SetSectionData() {
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SetSection(".data",
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ELF::SHT_PROGBITS,
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ELF::SHF_WRITE | ELF::SHF_ALLOC,
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SectionKind::getDataRel());
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EmitCodeAlignment(4, 0);
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}
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inline void MCELFStreamer::SetSectionText() {
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SetSection(".text",
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ELF::SHT_PROGBITS,
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ELF::SHF_EXECINSTR | ELF::SHF_ALLOC,
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SectionKind::getText());
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EmitCodeAlignment(4, 0);
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}
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inline void MCELFStreamer::SetSectionBss() {
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SetSection(".bss",
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ELF::SHT_NOBITS,
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ELF::SHF_WRITE | ELF::SHF_ALLOC,
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SectionKind::getBSS());
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EmitCodeAlignment(4, 0);
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}
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MCELFStreamer::~MCELFStreamer() {
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}
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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() & ELF::SHF_TLS)
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MCELF::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; // Change parsing mode; no-op here.
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case MCAF_Code32: return; // Change parsing mode; no-op here.
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case MCAF_Code64: return; // Change parsing mode; 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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llvm_unreachable("invalid assembler flag!");
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}
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void MCELFStreamer::ChangeSection(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::ChangeSection(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_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_IndirectSymbol:
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llvm_unreachable("Invalid symbol attribute for ELF!");
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case MCSA_NoDeadStrip:
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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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MCELF::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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MCELF::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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MCELF::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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MCELF::SetType(SD, ELF::STT_FUNC);
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break;
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case MCSA_ELF_TypeIndFunction:
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MCELF::SetType(SD, ELF::STT_GNU_IFUNC);
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break;
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case MCSA_ELF_TypeObject:
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MCELF::SetType(SD, ELF::STT_OBJECT);
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break;
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case MCSA_ELF_TypeTLS:
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MCELF::SetType(SD, ELF::STT_TLS);
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break;
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case MCSA_ELF_TypeCommon:
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MCELF::SetType(SD, ELF::STT_COMMON);
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break;
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case MCSA_ELF_TypeNoType:
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MCELF::SetType(SD, ELF::STT_NOTYPE);
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break;
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case MCSA_Protected:
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MCELF::SetVisibility(SD, ELF::STV_PROTECTED);
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break;
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case MCSA_Hidden:
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MCELF::SetVisibility(SD, ELF::STV_HIDDEN);
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break;
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case MCSA_Internal:
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MCELF::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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MCELF::SetBinding(SD, ELF::STB_GLOBAL);
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SD.setExternal(true);
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}
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MCELF::SetType(SD, ELF::STT_OBJECT);
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if (MCELF::GetBinding(SD) == ELF_STB_Local) {
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const MCSection *Section = getAssembler().getContext().getELFSection(".bss",
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ELF::SHT_NOBITS,
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ELF::SHF_WRITE |
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ELF::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::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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void MCELFStreamer::EmitLocalCommonSymbol(MCSymbol *Symbol, uint64_t Size,
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unsigned ByteAlignment) {
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// FIXME: Should this be caught and done earlier?
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MCSymbolData &SD = getAssembler().getOrCreateSymbolData(*Symbol);
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MCELF::SetBinding(SD, ELF::STB_LOCAL);
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SD.setExternal(false);
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BindingExplicitlySet.insert(Symbol);
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EmitCommonSymbol(Symbol, Size, ByteAlignment);
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}
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void MCELFStreamer::EmitValueImpl(const MCExpr *Value, unsigned Size,
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unsigned AddrSpace) {
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fixSymbolsInTLSFixups(Value);
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MCObjectStreamer::EmitValueImpl(Value, Size, AddrSpace);
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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(*getCurrentSection());
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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_GOTTPOFF:
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case MCSymbolRefExpr::VK_INDNTPOFF:
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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_TLSLD:
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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_ARM_TLSGD:
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case MCSymbolRefExpr::VK_ARM_TPOFF:
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case MCSymbolRefExpr::VK_ARM_GOTTPOFF:
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case MCSymbolRefExpr::VK_Mips_TLSGD:
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case MCSymbolRefExpr::VK_Mips_GOTTPREL:
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case MCSymbolRefExpr::VK_Mips_TPREL_HI:
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case MCSymbolRefExpr::VK_Mips_TPREL_LO:
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break;
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}
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MCSymbolData &SD = getAssembler().getOrCreateSymbolData(symRef.getSymbol());
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MCELF::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;
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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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for (unsigned i = 0, e = Fixups.size(); i != e; ++i)
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fixSymbolsInTLSFixups(Fixups[i].getValue());
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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::FinishImpl() {
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EmitFrames(true);
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for (std::vector<LocalCommon>::const_iterator i = LocalCommons.begin(),
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e = LocalCommons.end();
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i != e; ++i) {
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MCSymbolData *SD = i->SD;
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uint64_t Size = i->Size;
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unsigned ByteAlignment = i->ByteAlignment;
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const MCSymbol &Symbol = SD->getSymbol();
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const MCSection &Section = Symbol.getSection();
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MCSectionData &SectData = getAssembler().getOrCreateSectionData(Section);
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new MCAlignFragment(ByteAlignment, 0, 1, ByteAlignment, &SectData);
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MCFragment *F = new MCFillFragment(0, 0, Size, &SectData);
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SD->setFragment(F);
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// Update the maximum alignment of the section if necessary.
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if (ByteAlignment > SectData.getAlignment())
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SectData.setAlignment(ByteAlignment);
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}
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this->MCObjectStreamer::FinishImpl();
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}
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void MCELFStreamer::EmitTCEntry(const MCSymbol &S) {
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// Creates a R_PPC64_TOC relocation
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MCObjectStreamer::EmitSymbolValue(&S, 8, 0);
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}
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MCStreamer *llvm::createELFStreamer(MCContext &Context, MCAsmBackend &MAB,
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raw_ostream &OS, MCCodeEmitter *CE,
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bool RelaxAll, bool NoExecStack) {
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MCELFStreamer *S = new MCELFStreamer(Context, MAB, OS, CE);
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if (RelaxAll)
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S->getAssembler().setRelaxAll(true);
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if (NoExecStack)
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S->getAssembler().setNoExecStack(true);
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return S;
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}
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void MCELFStreamer::EmitThumbFunc(MCSymbol *Func) {
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llvm_unreachable("Generic ELF doesn't support this directive");
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}
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void MCELFStreamer::EmitSymbolDesc(MCSymbol *Symbol, unsigned DescValue) {
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llvm_unreachable("ELF doesn't support this directive");
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}
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void MCELFStreamer::BeginCOFFSymbolDef(const MCSymbol *Symbol) {
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llvm_unreachable("ELF doesn't support this directive");
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}
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void MCELFStreamer::EmitCOFFSymbolStorageClass(int StorageClass) {
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llvm_unreachable("ELF doesn't support this directive");
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}
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void MCELFStreamer::EmitCOFFSymbolType(int Type) {
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llvm_unreachable("ELF doesn't support this directive");
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}
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void MCELFStreamer::EndCOFFSymbolDef() {
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llvm_unreachable("ELF doesn't support this directive");
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}
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void MCELFStreamer::EmitZerofill(const MCSection *Section, MCSymbol *Symbol,
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uint64_t Size, unsigned ByteAlignment) {
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llvm_unreachable("ELF doesn't support this directive");
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}
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void MCELFStreamer::EmitTBSSSymbol(const MCSection *Section, MCSymbol *Symbol,
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uint64_t Size, unsigned ByteAlignment) {
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llvm_unreachable("ELF doesn't support this directive");
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}
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