mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-08-24 09:29:42 +00:00
MCFragment didn't really need vtables. The majority of virtual methods were just getters and setters. This removes the vtables and uses dispatch on the kind to do things like delete which needs to get the appropriate class. This reduces memory on the verify use list order test case by about 2MB out of 800MB. Reviewed by Rafael Espíndola git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@239952 91177308-0d34-0410-b5e6-96231b3b80d8
705 lines
24 KiB
C++
705 lines
24 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/STLExtras.h"
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#include "llvm/ADT/SmallPtrSet.h"
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#include "llvm/MC/MCAsmBackend.h"
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#include "llvm/MC/MCAsmLayout.h"
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#include "llvm/MC/MCAsmInfo.h"
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#include "llvm/MC/MCAssembler.h"
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#include "llvm/MC/MCCodeEmitter.h"
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#include "llvm/MC/MCContext.h"
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#include "llvm/MC/MCExpr.h"
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#include "llvm/MC/MCInst.h"
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#include "llvm/MC/MCObjectFileInfo.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/MCSymbolELF.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/TargetRegistry.h"
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#include "llvm/Support/raw_ostream.h"
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using namespace llvm;
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bool MCELFStreamer::isBundleLocked() const {
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return getCurrentSectionOnly()->isBundleLocked();
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}
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MCELFStreamer::~MCELFStreamer() {
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}
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void MCELFStreamer::mergeFragment(MCDataFragment *DF,
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MCDataFragment *EF) {
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MCAssembler &Assembler = getAssembler();
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if (Assembler.isBundlingEnabled() && Assembler.getRelaxAll()) {
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uint64_t FSize = EF->getContents().size();
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if (FSize > Assembler.getBundleAlignSize())
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report_fatal_error("Fragment can't be larger than a bundle size");
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uint64_t RequiredBundlePadding = computeBundlePadding(
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Assembler, EF, DF->getContents().size(), FSize);
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if (RequiredBundlePadding > UINT8_MAX)
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report_fatal_error("Padding cannot exceed 255 bytes");
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if (RequiredBundlePadding > 0) {
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SmallString<256> Code;
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raw_svector_ostream VecOS(Code);
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MCObjectWriter *OW = Assembler.getBackend().createObjectWriter(VecOS);
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EF->setBundlePadding(static_cast<uint8_t>(RequiredBundlePadding));
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Assembler.writeFragmentPadding(*EF, FSize, OW);
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VecOS.flush();
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delete OW;
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DF->getContents().append(Code.begin(), Code.end());
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}
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}
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flushPendingLabels(DF, DF->getContents().size());
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for (unsigned i = 0, e = EF->getFixups().size(); i != e; ++i) {
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EF->getFixups()[i].setOffset(EF->getFixups()[i].getOffset() +
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DF->getContents().size());
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DF->getFixups().push_back(EF->getFixups()[i]);
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}
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DF->setHasInstructions(true);
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DF->getContents().append(EF->getContents().begin(), EF->getContents().end());
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}
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void MCELFStreamer::InitSections(bool NoExecStack) {
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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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MCContext &Ctx = getContext();
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SwitchSection(Ctx.getObjectFileInfo()->getTextSection());
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EmitCodeAlignment(4);
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SwitchSection(Ctx.getObjectFileInfo()->getDataSection());
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EmitCodeAlignment(4);
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SwitchSection(Ctx.getObjectFileInfo()->getBSSSection());
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EmitCodeAlignment(4);
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SwitchSection(Ctx.getObjectFileInfo()->getTextSection());
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if (NoExecStack)
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SwitchSection(Ctx.getAsmInfo()->getNonexecutableStackSection(Ctx));
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}
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void MCELFStreamer::EmitLabel(MCSymbol *S) {
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auto *Symbol = cast<MCSymbolELF>(S);
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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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if (Section.getFlags() & ELF::SHF_TLS)
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Symbol->setType(ELF::STT_TLS);
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}
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void MCELFStreamer::EmitAssemblerFlag(MCAssemblerFlag Flag) {
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// Let the target do whatever target specific stuff it needs to do.
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getAssembler().getBackend().handleAssemblerFlag(Flag);
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// Do any generic stuff we need to do.
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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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// If bundle aligment is used and there are any instructions in the section, it
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// needs to be aligned to at least the bundle size.
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static void setSectionAlignmentForBundling(const MCAssembler &Assembler,
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MCSection *Section) {
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if (Section && Assembler.isBundlingEnabled() && Section->hasInstructions() &&
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Section->getAlignment() < Assembler.getBundleAlignSize())
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Section->setAlignment(Assembler.getBundleAlignSize());
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}
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void MCELFStreamer::ChangeSection(MCSection *Section,
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const MCExpr *Subsection) {
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MCSection *CurSection = getCurrentSectionOnly();
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if (CurSection && isBundleLocked())
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report_fatal_error("Unterminated .bundle_lock when changing a section");
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MCAssembler &Asm = getAssembler();
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// Ensure the previous section gets aligned if necessary.
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setSectionAlignmentForBundling(Asm, CurSection);
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auto *SectionELF = static_cast<const MCSectionELF *>(Section);
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const MCSymbol *Grp = SectionELF->getGroup();
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if (Grp)
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Asm.registerSymbol(*Grp);
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this->MCObjectStreamer::ChangeSection(Section, Subsection);
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MCContext &Ctx = getContext();
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auto *Begin = cast_or_null<MCSymbolELF>(Section->getBeginSymbol());
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if (!Begin) {
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Begin = Ctx.getOrCreateSectionSymbol(*SectionELF);
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Section->setBeginSymbol(Begin);
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}
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if (Begin->isUndefined()) {
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Asm.registerSymbol(*Begin);
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Begin->setType(ELF::STT_SECTION);
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}
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}
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void MCELFStreamer::EmitWeakReference(MCSymbol *Alias, const MCSymbol *Symbol) {
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getAssembler().registerSymbol(*Symbol);
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const MCExpr *Value = MCSymbolRefExpr::create(
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Symbol, MCSymbolRefExpr::VK_WEAKREF, 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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for (unsigned Type : {ELF::STT_NOTYPE, ELF::STT_OBJECT, ELF::STT_FUNC,
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ELF::STT_GNU_IFUNC, ELF::STT_TLS}) {
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if (T1 == Type)
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return T2;
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if (T2 == Type)
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return T1;
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}
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return T2;
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}
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bool MCELFStreamer::EmitSymbolAttribute(MCSymbol *S, MCSymbolAttr Attribute) {
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auto *Symbol = cast<MCSymbolELF>(S);
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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.Section = getCurrentSectionOnly();
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getAssembler().getIndirectSymbols().push_back(ISD);
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return true;
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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 registerSymbol here is to register
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// the symbol with the assembler.
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getAssembler().registerSymbol(*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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return false;
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case MCSA_NoDeadStrip:
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// Ignore for now.
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break;
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case MCSA_ELF_TypeGnuUniqueObject:
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Symbol->setType(CombineSymbolTypes(Symbol->getType(), ELF::STT_OBJECT));
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Symbol->setBinding(ELF::STB_GNU_UNIQUE);
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Symbol->setExternal(true);
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break;
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case MCSA_Global:
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Symbol->setBinding(ELF::STB_GLOBAL);
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Symbol->setExternal(true);
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break;
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case MCSA_WeakReference:
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case MCSA_Weak:
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Symbol->setBinding(ELF::STB_WEAK);
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Symbol->setExternal(true);
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break;
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case MCSA_Local:
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Symbol->setBinding(ELF::STB_LOCAL);
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Symbol->setExternal(false);
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break;
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case MCSA_ELF_TypeFunction:
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Symbol->setType(CombineSymbolTypes(Symbol->getType(), ELF::STT_FUNC));
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break;
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case MCSA_ELF_TypeIndFunction:
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Symbol->setType(CombineSymbolTypes(Symbol->getType(), ELF::STT_GNU_IFUNC));
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break;
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case MCSA_ELF_TypeObject:
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Symbol->setType(CombineSymbolTypes(Symbol->getType(), ELF::STT_OBJECT));
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break;
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case MCSA_ELF_TypeTLS:
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Symbol->setType(CombineSymbolTypes(Symbol->getType(), 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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Symbol->setType(CombineSymbolTypes(Symbol->getType(), ELF::STT_OBJECT));
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break;
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case MCSA_ELF_TypeNoType:
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Symbol->setType(CombineSymbolTypes(Symbol->getType(), ELF::STT_NOTYPE));
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break;
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case MCSA_Protected:
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Symbol->setVisibility(ELF::STV_PROTECTED);
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break;
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case MCSA_Hidden:
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Symbol->setVisibility(ELF::STV_HIDDEN);
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break;
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case MCSA_Internal:
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Symbol->setVisibility(ELF::STV_INTERNAL);
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break;
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}
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return true;
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}
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void MCELFStreamer::EmitCommonSymbol(MCSymbol *S, uint64_t Size,
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unsigned ByteAlignment) {
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auto *Symbol = cast<MCSymbolELF>(S);
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getAssembler().registerSymbol(*Symbol);
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if (!Symbol->isBindingSet()) {
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Symbol->setBinding(ELF::STB_GLOBAL);
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Symbol->setExternal(true);
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}
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Symbol->setType(ELF::STT_OBJECT);
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if (Symbol->getBinding() == ELF::STB_LOCAL) {
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MCSection *Section = getAssembler().getContext().getELFSection(
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".bss", ELF::SHT_NOBITS, ELF::SHF_WRITE | ELF::SHF_ALLOC);
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AssignSection(Symbol, Section);
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struct LocalCommon L = {Symbol, Size, ByteAlignment};
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LocalCommons.push_back(L);
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} else {
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if(Symbol->declareCommon(Size, ByteAlignment))
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report_fatal_error("Symbol: " + Symbol->getName() +
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" redeclared as different type");
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}
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cast<MCSymbolELF>(Symbol)
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->setSize(MCConstantExpr::create(Size, getContext()));
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}
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void MCELFStreamer::emitELFSize(MCSymbolELF *Symbol, const MCExpr *Value) {
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Symbol->setSize(Value);
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}
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void MCELFStreamer::EmitLocalCommonSymbol(MCSymbol *S, uint64_t Size,
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unsigned ByteAlignment) {
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auto *Symbol = cast<MCSymbolELF>(S);
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// FIXME: Should this be caught and done earlier?
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getAssembler().registerSymbol(*Symbol);
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Symbol->setBinding(ELF::STB_LOCAL);
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Symbol->setExternal(false);
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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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const SMLoc &Loc) {
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if (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, Loc);
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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 (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. They start after the
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// null symbol and don't count as normal symbol, i.e. a non-STT_FILE symbol
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// with the same name may appear.
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void MCELFStreamer::EmitFileDirective(StringRef Filename) {
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getAssembler().addFileName(Filename);
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}
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void MCELFStreamer::EmitIdent(StringRef IdentString) {
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MCSection *Comment = getAssembler().getContext().getELFSection(
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".comment", ELF::SHT_PROGBITS, ELF::SHF_MERGE | ELF::SHF_STRINGS, 1, "");
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PushSection();
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SwitchSection(Comment);
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if (!SeenIdent) {
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EmitIntValue(0, 1);
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SeenIdent = true;
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}
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EmitBytes(IdentString);
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EmitIntValue(0, 1);
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PopSection();
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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_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_DTPMOD:
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case MCSymbolRefExpr::VK_PPC_TPREL:
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case MCSymbolRefExpr::VK_PPC_TPREL_LO:
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case MCSymbolRefExpr::VK_PPC_TPREL_HI:
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case MCSymbolRefExpr::VK_PPC_TPREL_HA:
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case MCSymbolRefExpr::VK_PPC_TPREL_HIGHER:
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case MCSymbolRefExpr::VK_PPC_TPREL_HIGHERA:
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case MCSymbolRefExpr::VK_PPC_TPREL_HIGHEST:
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case MCSymbolRefExpr::VK_PPC_TPREL_HIGHESTA:
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case MCSymbolRefExpr::VK_PPC_DTPREL:
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case MCSymbolRefExpr::VK_PPC_DTPREL_LO:
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case MCSymbolRefExpr::VK_PPC_DTPREL_HI:
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case MCSymbolRefExpr::VK_PPC_DTPREL_HA:
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case MCSymbolRefExpr::VK_PPC_DTPREL_HIGHER:
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case MCSymbolRefExpr::VK_PPC_DTPREL_HIGHERA:
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case MCSymbolRefExpr::VK_PPC_DTPREL_HIGHEST:
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case MCSymbolRefExpr::VK_PPC_DTPREL_HIGHESTA:
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case MCSymbolRefExpr::VK_PPC_GOT_TPREL:
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case MCSymbolRefExpr::VK_PPC_GOT_TPREL_LO:
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case MCSymbolRefExpr::VK_PPC_GOT_TPREL_HI:
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case MCSymbolRefExpr::VK_PPC_GOT_TPREL_HA:
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case MCSymbolRefExpr::VK_PPC_GOT_DTPREL:
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case MCSymbolRefExpr::VK_PPC_GOT_DTPREL_LO:
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case MCSymbolRefExpr::VK_PPC_GOT_DTPREL_HI:
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case MCSymbolRefExpr::VK_PPC_GOT_DTPREL_HA:
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case MCSymbolRefExpr::VK_PPC_TLS:
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case MCSymbolRefExpr::VK_PPC_GOT_TLSGD:
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case MCSymbolRefExpr::VK_PPC_GOT_TLSGD_LO:
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case MCSymbolRefExpr::VK_PPC_GOT_TLSGD_HI:
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case MCSymbolRefExpr::VK_PPC_GOT_TLSGD_HA:
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case MCSymbolRefExpr::VK_PPC_TLSGD:
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case MCSymbolRefExpr::VK_PPC_GOT_TLSLD:
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case MCSymbolRefExpr::VK_PPC_GOT_TLSLD_LO:
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case MCSymbolRefExpr::VK_PPC_GOT_TLSLD_HI:
|
|
case MCSymbolRefExpr::VK_PPC_GOT_TLSLD_HA:
|
|
case MCSymbolRefExpr::VK_PPC_TLSLD:
|
|
break;
|
|
}
|
|
getAssembler().registerSymbol(symRef.getSymbol());
|
|
cast<MCSymbolELF>(symRef.getSymbol()).setType(ELF::STT_TLS);
|
|
break;
|
|
}
|
|
|
|
case MCExpr::Unary:
|
|
fixSymbolsInTLSFixups(cast<MCUnaryExpr>(expr)->getSubExpr());
|
|
break;
|
|
}
|
|
}
|
|
|
|
void MCELFStreamer::EmitInstToFragment(const MCInst &Inst,
|
|
const MCSubtargetInfo &STI) {
|
|
this->MCObjectStreamer::EmitInstToFragment(Inst, STI);
|
|
MCRelaxableFragment &F = *cast<MCRelaxableFragment>(getCurrentFragment());
|
|
|
|
for (unsigned i = 0, e = F.getFixups().size(); i != e; ++i)
|
|
fixSymbolsInTLSFixups(F.getFixups()[i].getValue());
|
|
}
|
|
|
|
void MCELFStreamer::EmitInstToData(const MCInst &Inst,
|
|
const MCSubtargetInfo &STI) {
|
|
MCAssembler &Assembler = getAssembler();
|
|
SmallVector<MCFixup, 4> Fixups;
|
|
SmallString<256> Code;
|
|
raw_svector_ostream VecOS(Code);
|
|
Assembler.getEmitter().encodeInstruction(Inst, VecOS, Fixups, STI);
|
|
VecOS.flush();
|
|
|
|
for (unsigned i = 0, e = Fixups.size(); i != e; ++i)
|
|
fixSymbolsInTLSFixups(Fixups[i].getValue());
|
|
|
|
// There are several possibilities here:
|
|
//
|
|
// If bundling is disabled, append the encoded instruction to the current data
|
|
// fragment (or create a new such fragment if the current fragment is not a
|
|
// data fragment).
|
|
//
|
|
// If bundling is enabled:
|
|
// - If we're not in a bundle-locked group, emit the instruction into a
|
|
// fragment of its own. If there are no fixups registered for the
|
|
// instruction, emit a MCCompactEncodedInstFragment. Otherwise, emit a
|
|
// MCDataFragment.
|
|
// - If we're in a bundle-locked group, append the instruction to the current
|
|
// data fragment because we want all the instructions in a group to get into
|
|
// the same fragment. Be careful not to do that for the first instruction in
|
|
// the group, though.
|
|
MCDataFragment *DF;
|
|
|
|
if (Assembler.isBundlingEnabled()) {
|
|
MCSection &Sec = *getCurrentSectionOnly();
|
|
if (Assembler.getRelaxAll() && isBundleLocked())
|
|
// If the -mc-relax-all flag is used and we are bundle-locked, we re-use
|
|
// the current bundle group.
|
|
DF = BundleGroups.back();
|
|
else if (Assembler.getRelaxAll() && !isBundleLocked())
|
|
// When not in a bundle-locked group and the -mc-relax-all flag is used,
|
|
// we create a new temporary fragment which will be later merged into
|
|
// the current fragment.
|
|
DF = new MCDataFragment();
|
|
else if (isBundleLocked() && !Sec.isBundleGroupBeforeFirstInst())
|
|
// If we are bundle-locked, we re-use the current fragment.
|
|
// The bundle-locking directive ensures this is a new data fragment.
|
|
DF = cast<MCDataFragment>(getCurrentFragment());
|
|
else if (!isBundleLocked() && Fixups.size() == 0) {
|
|
// Optimize memory usage by emitting the instruction to a
|
|
// MCCompactEncodedInstFragment when not in a bundle-locked group and
|
|
// there are no fixups registered.
|
|
MCCompactEncodedInstFragment *CEIF = new MCCompactEncodedInstFragment();
|
|
insert(CEIF);
|
|
CEIF->getContents().append(Code.begin(), Code.end());
|
|
return;
|
|
} else {
|
|
DF = new MCDataFragment();
|
|
insert(DF);
|
|
}
|
|
if (Sec.getBundleLockState() == MCSection::BundleLockedAlignToEnd) {
|
|
// If this fragment is for a group marked "align_to_end", set a flag
|
|
// in the fragment. This can happen after the fragment has already been
|
|
// created if there are nested bundle_align groups and an inner one
|
|
// is the one marked align_to_end.
|
|
DF->setAlignToBundleEnd(true);
|
|
}
|
|
|
|
// We're now emitting an instruction in a bundle group, so this flag has
|
|
// to be turned off.
|
|
Sec.setBundleGroupBeforeFirstInst(false);
|
|
} else {
|
|
DF = getOrCreateDataFragment();
|
|
}
|
|
|
|
// 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->getFixups().push_back(Fixups[i]);
|
|
}
|
|
DF->setHasInstructions(true);
|
|
DF->getContents().append(Code.begin(), Code.end());
|
|
|
|
if (Assembler.isBundlingEnabled() && Assembler.getRelaxAll()) {
|
|
if (!isBundleLocked()) {
|
|
mergeFragment(getOrCreateDataFragment(), DF);
|
|
delete DF;
|
|
}
|
|
}
|
|
}
|
|
|
|
void MCELFStreamer::EmitBundleAlignMode(unsigned AlignPow2) {
|
|
assert(AlignPow2 <= 30 && "Invalid bundle alignment");
|
|
MCAssembler &Assembler = getAssembler();
|
|
if (AlignPow2 > 0 && (Assembler.getBundleAlignSize() == 0 ||
|
|
Assembler.getBundleAlignSize() == 1U << AlignPow2))
|
|
Assembler.setBundleAlignSize(1U << AlignPow2);
|
|
else
|
|
report_fatal_error(".bundle_align_mode cannot be changed once set");
|
|
}
|
|
|
|
void MCELFStreamer::EmitBundleLock(bool AlignToEnd) {
|
|
MCSection &Sec = *getCurrentSectionOnly();
|
|
|
|
// Sanity checks
|
|
//
|
|
if (!getAssembler().isBundlingEnabled())
|
|
report_fatal_error(".bundle_lock forbidden when bundling is disabled");
|
|
|
|
if (!isBundleLocked())
|
|
Sec.setBundleGroupBeforeFirstInst(true);
|
|
|
|
if (getAssembler().getRelaxAll() && !isBundleLocked()) {
|
|
// TODO: drop the lock state and set directly in the fragment
|
|
MCDataFragment *DF = new MCDataFragment();
|
|
BundleGroups.push_back(DF);
|
|
}
|
|
|
|
Sec.setBundleLockState(AlignToEnd ? MCSection::BundleLockedAlignToEnd
|
|
: MCSection::BundleLocked);
|
|
}
|
|
|
|
void MCELFStreamer::EmitBundleUnlock() {
|
|
MCSection &Sec = *getCurrentSectionOnly();
|
|
|
|
// Sanity checks
|
|
if (!getAssembler().isBundlingEnabled())
|
|
report_fatal_error(".bundle_unlock forbidden when bundling is disabled");
|
|
else if (!isBundleLocked())
|
|
report_fatal_error(".bundle_unlock without matching lock");
|
|
else if (Sec.isBundleGroupBeforeFirstInst())
|
|
report_fatal_error("Empty bundle-locked group is forbidden");
|
|
|
|
// When the -mc-relax-all flag is used, we emit instructions to fragments
|
|
// stored on a stack. When the bundle unlock is emited, we pop a fragment
|
|
// from the stack a merge it to the one below.
|
|
if (getAssembler().getRelaxAll()) {
|
|
assert(!BundleGroups.empty() && "There are no bundle groups");
|
|
MCDataFragment *DF = BundleGroups.back();
|
|
|
|
// FIXME: Use BundleGroups to track the lock state instead.
|
|
Sec.setBundleLockState(MCSection::NotBundleLocked);
|
|
|
|
// FIXME: Use more separate fragments for nested groups.
|
|
if (!isBundleLocked()) {
|
|
mergeFragment(getOrCreateDataFragment(), DF);
|
|
BundleGroups.pop_back();
|
|
delete DF;
|
|
}
|
|
|
|
if (Sec.getBundleLockState() != MCSection::BundleLockedAlignToEnd)
|
|
getOrCreateDataFragment()->setAlignToBundleEnd(false);
|
|
} else
|
|
Sec.setBundleLockState(MCSection::NotBundleLocked);
|
|
}
|
|
|
|
void MCELFStreamer::Flush() {
|
|
for (std::vector<LocalCommon>::const_iterator i = LocalCommons.begin(),
|
|
e = LocalCommons.end();
|
|
i != e; ++i) {
|
|
const MCSymbol &Symbol = *i->Symbol;
|
|
uint64_t Size = i->Size;
|
|
unsigned ByteAlignment = i->ByteAlignment;
|
|
MCSection &Section = Symbol.getSection();
|
|
|
|
getAssembler().registerSection(Section);
|
|
new MCAlignFragment(ByteAlignment, 0, 1, ByteAlignment, &Section);
|
|
|
|
MCFragment *F = new MCFillFragment(0, 0, Size, &Section);
|
|
Symbol.setFragment(F);
|
|
|
|
// Update the maximum alignment of the section if necessary.
|
|
if (ByteAlignment > Section.getAlignment())
|
|
Section.setAlignment(ByteAlignment);
|
|
}
|
|
|
|
LocalCommons.clear();
|
|
}
|
|
|
|
void MCELFStreamer::FinishImpl() {
|
|
// Ensure the last section gets aligned if necessary.
|
|
MCSection *CurSection = getCurrentSectionOnly();
|
|
setSectionAlignmentForBundling(getAssembler(), CurSection);
|
|
|
|
EmitFrames(nullptr);
|
|
|
|
Flush();
|
|
|
|
this->MCObjectStreamer::FinishImpl();
|
|
}
|
|
|
|
MCStreamer *llvm::createELFStreamer(MCContext &Context, MCAsmBackend &MAB,
|
|
raw_pwrite_stream &OS, MCCodeEmitter *CE,
|
|
bool RelaxAll) {
|
|
MCELFStreamer *S = new MCELFStreamer(Context, MAB, OS, CE);
|
|
if (RelaxAll)
|
|
S->getAssembler().setRelaxAll(true);
|
|
return S;
|
|
}
|
|
|
|
void MCELFStreamer::EmitThumbFunc(MCSymbol *Func) {
|
|
llvm_unreachable("Generic ELF doesn't support this directive");
|
|
}
|
|
|
|
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(MCSection *Section, MCSymbol *Symbol,
|
|
uint64_t Size, unsigned ByteAlignment) {
|
|
llvm_unreachable("ELF doesn't support this directive");
|
|
}
|
|
|
|
void MCELFStreamer::EmitTBSSSymbol(MCSection *Section, MCSymbol *Symbol,
|
|
uint64_t Size, unsigned ByteAlignment) {
|
|
llvm_unreachable("ELF doesn't support this directive");
|
|
}
|