584 lines
20 KiB
C++
584 lines
20 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/ADT/STLExtras.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::InitToTextSection() {
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SetSectionText();
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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::EmitDebugLabel(MCSymbol *Symbol) {
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EmitLabel(Symbol);
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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 MCExpr *Subsection) {
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MCSectionData *CurSection = getCurrentSectionData();
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if (CurSection && CurSection->isBundleLocked())
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report_fatal_error("Unterminated .bundle_lock when changing a 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, Subsection);
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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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// When GNU as encounters more than one .type declaration for an object it seems
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// to use a mechanism similar to the one below to decide which type is actually
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// used in the object file. The greater of T1 and T2 is selected based on the
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// following ordering:
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// STT_NOTYPE < STT_OBJECT < STT_FUNC < STT_GNU_IFUNC < STT_TLS < anything else
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// If neither T1 < T2 nor T2 < T1 according to this ordering, use T2 (the user
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// provided type).
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static unsigned CombineSymbolTypes(unsigned T1, unsigned T2) {
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unsigned TypeOrdering[] = {ELF::STT_NOTYPE, ELF::STT_OBJECT, ELF::STT_FUNC,
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ELF::STT_GNU_IFUNC, ELF::STT_TLS};
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for (unsigned i = 0; i != array_lengthof(TypeOrdering); ++i) {
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if (T1 == TypeOrdering[i])
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return T2;
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if (T2 == TypeOrdering[i])
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return T1;
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}
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return T2;
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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, CombineSymbolTypes(MCELF::GetType(SD),
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ELF::STT_FUNC));
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break;
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case MCSA_ELF_TypeIndFunction:
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MCELF::SetType(SD, CombineSymbolTypes(MCELF::GetType(SD),
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ELF::STT_GNU_IFUNC));
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break;
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case MCSA_ELF_TypeObject:
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MCELF::SetType(SD, CombineSymbolTypes(MCELF::GetType(SD),
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ELF::STT_OBJECT));
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break;
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case MCSA_ELF_TypeTLS:
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MCELF::SetType(SD, CombineSymbolTypes(MCELF::GetType(SD),
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ELF::STT_TLS));
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break;
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case MCSA_ELF_TypeCommon:
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// TODO: Emit these as a common symbol.
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MCELF::SetType(SD, CombineSymbolTypes(MCELF::GetType(SD),
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ELF::STT_OBJECT));
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break;
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case MCSA_ELF_TypeNoType:
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MCELF::SetType(SD, CombineSymbolTypes(MCELF::GetType(SD),
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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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if (getCurrentSectionData()->isBundleLocked())
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report_fatal_error("Emitting values inside a locked bundle is forbidden");
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fixSymbolsInTLSFixups(Value);
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MCObjectStreamer::EmitValueImpl(Value, Size, AddrSpace);
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}
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void MCELFStreamer::EmitValueToAlignment(unsigned ByteAlignment,
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int64_t Value,
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unsigned ValueSize,
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unsigned MaxBytesToEmit) {
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if (getCurrentSectionData()->isBundleLocked())
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report_fatal_error("Emitting values inside a locked bundle is forbidden");
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MCObjectStreamer::EmitValueToAlignment(ByteAlignment, Value,
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ValueSize, MaxBytesToEmit);
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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().first);
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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:
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cast<MCTargetExpr>(expr)->fixELFSymbolsInTLSFixups(getAssembler());
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break;
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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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case MCSymbolRefExpr::VK_PPC_TPREL16_HA:
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case MCSymbolRefExpr::VK_PPC_TPREL16_LO:
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case MCSymbolRefExpr::VK_PPC_DTPREL16_HA:
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case MCSymbolRefExpr::VK_PPC_DTPREL16_LO:
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case MCSymbolRefExpr::VK_PPC_GOT_TPREL16_HA:
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case MCSymbolRefExpr::VK_PPC_GOT_TPREL16_LO:
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case MCSymbolRefExpr::VK_PPC_TLS:
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case MCSymbolRefExpr::VK_PPC_GOT_TLSGD16_HA:
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case MCSymbolRefExpr::VK_PPC_GOT_TLSGD16_LO:
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case MCSymbolRefExpr::VK_PPC_TLSGD:
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case MCSymbolRefExpr::VK_PPC_GOT_TLSLD16_HA:
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case MCSymbolRefExpr::VK_PPC_GOT_TLSLD16_LO:
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case MCSymbolRefExpr::VK_PPC_TLSLD:
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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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MCRelaxableFragment &F = *cast<MCRelaxableFragment>(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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MCAssembler &Assembler = getAssembler();
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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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Assembler.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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// There are several possibilities here:
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//
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// If bundling is disabled, append the encoded instruction to the current data
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// fragment (or create a new such fragment if the current fragment is not a
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// data fragment).
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//
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// If bundling is enabled:
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// - If we're not in a bundle-locked group, emit the instruction into a
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// fragment of its own. If there are no fixups registered for the
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// instruction, emit a MCCompactEncodedInstFragment. Otherwise, emit a
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// MCDataFragment.
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// - If we're in a bundle-locked group, append the instruction to the current
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// data fragment because we want all the instructions in a group to get into
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// the same fragment. Be careful not to do that for the first instruction in
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// the group, though.
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MCDataFragment *DF;
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if (Assembler.isBundlingEnabled()) {
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MCSectionData *SD = getCurrentSectionData();
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if (SD->isBundleLocked() && !SD->isBundleGroupBeforeFirstInst())
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// If we are bundle-locked, we re-use the current fragment.
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// The bundle-locking directive ensures this is a new data fragment.
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DF = cast<MCDataFragment>(getCurrentFragment());
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else if (!SD->isBundleLocked() && Fixups.size() == 0) {
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// Optimize memory usage by emitting the instruction to a
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// MCCompactEncodedInstFragment when not in a bundle-locked group and
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// there are no fixups registered.
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MCCompactEncodedInstFragment *CEIF = new MCCompactEncodedInstFragment();
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insert(CEIF);
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CEIF->getContents().append(Code.begin(), Code.end());
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return;
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} else {
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DF = new MCDataFragment();
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insert(DF);
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if (SD->getBundleLockState() == MCSectionData::BundleLockedAlignToEnd) {
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// If this is a new fragment created for a bundle-locked group, and the
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// group was marked as "align_to_end", set a flag in the fragment.
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DF->setAlignToBundleEnd(true);
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}
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}
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// We're now emitting an instruction in a bundle group, so this flag has
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// to be turned off.
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SD->setBundleGroupBeforeFirstInst(false);
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} else {
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DF = getOrCreateDataFragment();
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}
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// Add the fixups and data.
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for (unsigned i = 0, e = Fixups.size(); i != e; ++i) {
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Fixups[i].setOffset(Fixups[i].getOffset() + DF->getContents().size());
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DF->getFixups().push_back(Fixups[i]);
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}
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DF->setHasInstructions(true);
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DF->getContents().append(Code.begin(), Code.end());
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}
|
|
|
|
void MCELFStreamer::EmitBundleAlignMode(unsigned AlignPow2) {
|
|
assert(AlignPow2 <= 30 && "Invalid bundle alignment");
|
|
MCAssembler &Assembler = getAssembler();
|
|
if (Assembler.getBundleAlignSize() == 0 && AlignPow2 > 0)
|
|
Assembler.setBundleAlignSize(1 << AlignPow2);
|
|
else
|
|
report_fatal_error(".bundle_align_mode should be only set once per file");
|
|
}
|
|
|
|
void MCELFStreamer::EmitBundleLock(bool AlignToEnd) {
|
|
MCSectionData *SD = getCurrentSectionData();
|
|
|
|
// Sanity checks
|
|
//
|
|
if (!getAssembler().isBundlingEnabled())
|
|
report_fatal_error(".bundle_lock forbidden when bundling is disabled");
|
|
else if (SD->isBundleLocked())
|
|
report_fatal_error("Nesting of .bundle_lock is forbidden");
|
|
|
|
SD->setBundleLockState(AlignToEnd ? MCSectionData::BundleLockedAlignToEnd :
|
|
MCSectionData::BundleLocked);
|
|
SD->setBundleGroupBeforeFirstInst(true);
|
|
}
|
|
|
|
void MCELFStreamer::EmitBundleUnlock() {
|
|
MCSectionData *SD = getCurrentSectionData();
|
|
|
|
// Sanity checks
|
|
if (!getAssembler().isBundlingEnabled())
|
|
report_fatal_error(".bundle_unlock forbidden when bundling is disabled");
|
|
else if (!SD->isBundleLocked())
|
|
report_fatal_error(".bundle_unlock without matching lock");
|
|
else if (SD->isBundleGroupBeforeFirstInst())
|
|
report_fatal_error("Empty bundle-locked group is forbidden");
|
|
|
|
SD->setBundleLockState(MCSectionData::NotBundleLocked);
|
|
}
|
|
|
|
void MCELFStreamer::FinishImpl() {
|
|
EmitFrames(true);
|
|
|
|
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::FinishImpl();
|
|
}
|
|
void MCELFStreamer::EmitTCEntry(const MCSymbol &S) {
|
|
// Creates a R_PPC64_TOC relocation
|
|
MCObjectStreamer::EmitSymbolValue(&S, 8);
|
|
}
|
|
|
|
MCStreamer *llvm::createELFStreamer(MCContext &Context, MCAsmBackend &MAB,
|
|
raw_ostream &OS, MCCodeEmitter *CE,
|
|
bool RelaxAll, bool NoExecStack) {
|
|
MCELFStreamer *S = new MCELFStreamer(Context, MAB, OS, CE);
|
|
if (RelaxAll)
|
|
S->getAssembler().setRelaxAll(true);
|
|
if (NoExecStack)
|
|
S->getAssembler().setNoExecStack(true);
|
|
return S;
|
|
}
|
|
|
|
void MCELFStreamer::EmitThumbFunc(MCSymbol *Func) {
|
|
llvm_unreachable("Generic ELF doesn't support this directive");
|
|
}
|
|
|
|
MCSymbolData &MCELFStreamer::getOrCreateSymbolData(MCSymbol *Symbol) {
|
|
return getAssembler().getOrCreateSymbolData(*Symbol);
|
|
}
|
|
|
|
void MCELFStreamer::EmitSymbolDesc(MCSymbol *Symbol, unsigned DescValue) {
|
|
llvm_unreachable("ELF doesn't support this directive");
|
|
}
|
|
|
|
void MCELFStreamer::BeginCOFFSymbolDef(const MCSymbol *Symbol) {
|
|
llvm_unreachable("ELF doesn't support this directive");
|
|
}
|
|
|
|
void MCELFStreamer::EmitCOFFSymbolStorageClass(int StorageClass) {
|
|
llvm_unreachable("ELF doesn't support this directive");
|
|
}
|
|
|
|
void MCELFStreamer::EmitCOFFSymbolType(int Type) {
|
|
llvm_unreachable("ELF doesn't support this directive");
|
|
}
|
|
|
|
void MCELFStreamer::EndCOFFSymbolDef() {
|
|
llvm_unreachable("ELF doesn't support this directive");
|
|
}
|
|
|
|
void MCELFStreamer::EmitZerofill(const MCSection *Section, MCSymbol *Symbol,
|
|
uint64_t Size, unsigned ByteAlignment) {
|
|
llvm_unreachable("ELF doesn't support this directive");
|
|
}
|
|
|
|
void MCELFStreamer::EmitTBSSSymbol(const MCSection *Section, MCSymbol *Symbol,
|
|
uint64_t Size, unsigned ByteAlignment) {
|
|
llvm_unreachable("ELF doesn't support this directive");
|
|
}
|