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6d5b578789
Also, update the version number to 0x1, which is what engines are now expecting. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@295860 91177308-0d34-0410-b5e6-96231b3b80d8
122 lines
4.0 KiB
C++
122 lines
4.0 KiB
C++
//===- lib/MC/WasmObjectWriter.cpp - Wasm File Writer ---------------------===//
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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 implements Wasm object file writer information.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/ADT/STLExtras.h"
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#include "llvm/ADT/SmallPtrSet.h"
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#include "llvm/ADT/SmallString.h"
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#include "llvm/ADT/StringMap.h"
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#include "llvm/MC/MCAsmBackend.h"
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#include "llvm/MC/MCAsmInfo.h"
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#include "llvm/MC/MCAsmLayout.h"
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#include "llvm/MC/MCAssembler.h"
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#include "llvm/MC/MCContext.h"
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#include "llvm/MC/MCExpr.h"
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#include "llvm/MC/MCFixupKindInfo.h"
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#include "llvm/MC/MCObjectFileInfo.h"
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#include "llvm/MC/MCObjectWriter.h"
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#include "llvm/MC/MCSectionWasm.h"
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#include "llvm/MC/MCSymbolWasm.h"
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#include "llvm/MC/MCValue.h"
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#include "llvm/MC/MCWasmObjectWriter.h"
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#include "llvm/Support/Debug.h"
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#include "llvm/Support/Endian.h"
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#include "llvm/Support/ErrorHandling.h"
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#include "llvm/Support/StringSaver.h"
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#include "llvm/Support/Wasm.h"
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#include <vector>
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using namespace llvm;
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#undef DEBUG_TYPE
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#define DEBUG_TYPE "reloc-info"
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namespace {
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typedef DenseMap<const MCSectionWasm *, uint32_t> SectionIndexMapTy;
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class WasmObjectWriter : public MCObjectWriter {
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/// Helper struct for containing some precomputed information on symbols.
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struct WasmSymbolData {
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const MCSymbolWasm *Symbol;
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StringRef Name;
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// Support lexicographic sorting.
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bool operator<(const WasmSymbolData &RHS) const { return Name < RHS.Name; }
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};
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/// The target specific Wasm writer instance.
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std::unique_ptr<MCWasmObjectTargetWriter> TargetObjectWriter;
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// TargetObjectWriter wrappers.
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bool is64Bit() const { return TargetObjectWriter->is64Bit(); }
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unsigned getRelocType(MCContext &Ctx, const MCValue &Target,
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const MCFixup &Fixup, bool IsPCRel) const {
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return TargetObjectWriter->getRelocType(Ctx, Target, Fixup, IsPCRel);
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}
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public:
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WasmObjectWriter(MCWasmObjectTargetWriter *MOTW, raw_pwrite_stream &OS)
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: MCObjectWriter(OS, /*IsLittleEndian=*/true), TargetObjectWriter(MOTW) {}
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void reset() override {
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MCObjectWriter::reset();
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}
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~WasmObjectWriter() override;
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void writeHeader(const MCAssembler &Asm);
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void recordRelocation(MCAssembler &Asm, const MCAsmLayout &Layout,
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const MCFragment *Fragment, const MCFixup &Fixup,
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MCValue Target, bool &IsPCRel,
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uint64_t &FixedValue) override;
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void executePostLayoutBinding(MCAssembler &Asm,
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const MCAsmLayout &Layout) override;
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void writeObject(MCAssembler &Asm, const MCAsmLayout &Layout) override;
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};
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} // end anonymous namespace
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WasmObjectWriter::~WasmObjectWriter() {}
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// Emit the Wasm header.
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void WasmObjectWriter::writeHeader(const MCAssembler &Asm) {
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writeBytes(StringRef(wasm::WasmMagic, sizeof(wasm::WasmMagic)));
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writeLE32(wasm::WasmVersion);
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}
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void WasmObjectWriter::executePostLayoutBinding(MCAssembler &Asm,
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const MCAsmLayout &Layout) {
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}
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void WasmObjectWriter::recordRelocation(MCAssembler &Asm,
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const MCAsmLayout &Layout,
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const MCFragment *Fragment,
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const MCFixup &Fixup, MCValue Target,
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bool &IsPCRel, uint64_t &FixedValue) {
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// TODO: Implement
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}
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void WasmObjectWriter::writeObject(MCAssembler &Asm,
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const MCAsmLayout &Layout) {
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// Write out the Wasm header.
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writeHeader(Asm);
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// TODO: Write the contents.
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}
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MCObjectWriter *llvm::createWasmObjectWriter(MCWasmObjectTargetWriter *MOTW,
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raw_pwrite_stream &OS) {
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return new WasmObjectWriter(MOTW, OS);
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}
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