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b1932b8483
When both aligned bundling and RelaxAll are enabled, bundle padding is directly written into fragments (https://reviews.llvm.org/D8072). (The original motivation was memory usage, which has been achieved from different angles with recent assembler improvement). The code presents challenges with the work to replace fragment representation (e.g. #94950 #95077). This patch removes the special handling. RelaxAll still works but the behavior seems slightly different as revealed by 2 changed tests. However, most `-mc-relax-all` tests are unchanged. RelaxAll used to be the default for clang -O0. This mode has significant code size drawbacks and newer Clang doesn't use it (#90013). --- flushPendingLabels: The FOffset parameter can be removed: pending labels will be assigned to the incoming fragment at offset 0. Pull Request: https://github.com/llvm/llvm-project/pull/95188
82 lines
2.8 KiB
C++
82 lines
2.8 KiB
C++
//===- MCWasmStreamer.h - MCStreamer Wasm Object File Interface -*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_MC_MCWASMSTREAMER_H
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#define LLVM_MC_MCWASMSTREAMER_H
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#include "MCAsmBackend.h"
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#include "MCCodeEmitter.h"
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#include "llvm/MC/MCDirectives.h"
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#include "llvm/MC/MCObjectStreamer.h"
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#include "llvm/MC/MCObjectWriter.h"
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#include "llvm/Support/DataTypes.h"
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namespace llvm {
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class MCExpr;
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class MCInst;
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class MCWasmStreamer : public MCObjectStreamer {
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public:
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MCWasmStreamer(MCContext &Context, std::unique_ptr<MCAsmBackend> TAB,
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std::unique_ptr<MCObjectWriter> OW,
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std::unique_ptr<MCCodeEmitter> Emitter)
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: MCObjectStreamer(Context, std::move(TAB), std::move(OW),
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std::move(Emitter)),
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SeenIdent(false) {}
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~MCWasmStreamer() override;
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/// state management
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void reset() override {
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SeenIdent = false;
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MCObjectStreamer::reset();
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}
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/// \name MCStreamer Interface
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/// @{
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void changeSection(MCSection *Section, const MCExpr *Subsection) override;
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void emitLabel(MCSymbol *Symbol, SMLoc Loc = SMLoc()) override;
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void emitLabelAtPos(MCSymbol *Symbol, SMLoc Loc, MCFragment *F,
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uint64_t Offset) override;
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void emitAssemblerFlag(MCAssemblerFlag Flag) override;
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void emitThumbFunc(MCSymbol *Func) override;
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void emitWeakReference(MCSymbol *Alias, const MCSymbol *Symbol) override;
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bool emitSymbolAttribute(MCSymbol *Symbol, MCSymbolAttr Attribute) override;
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void emitSymbolDesc(MCSymbol *Symbol, unsigned DescValue) override;
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void emitCommonSymbol(MCSymbol *Symbol, uint64_t Size,
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Align ByteAlignment) override;
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void emitELFSize(MCSymbol *Symbol, const MCExpr *Value) override;
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void emitLocalCommonSymbol(MCSymbol *Symbol, uint64_t Size,
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Align ByteAlignment) override;
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void emitZerofill(MCSection *Section, MCSymbol *Symbol = nullptr,
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uint64_t Size = 0, Align ByteAlignment = Align(1),
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SMLoc Loc = SMLoc()) override;
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void emitTBSSSymbol(MCSection *Section, MCSymbol *Symbol, uint64_t Size,
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Align ByteAlignment = Align(1)) override;
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void emitIdent(StringRef IdentString) override;
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void finishImpl() override;
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private:
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void emitInstToFragment(const MCInst &Inst, const MCSubtargetInfo &) override;
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void emitInstToData(const MCInst &Inst, const MCSubtargetInfo &) override;
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void fixSymbolsInTLSFixups(const MCExpr *expr);
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bool SeenIdent;
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};
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} // end namespace llvm
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#endif
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