77 lines
2.7 KiB
C++
77 lines
2.7 KiB
C++
//===- llvm/MC/MCSPIRVObjectWriter.cpp - SPIR-V Object Writer ----*- 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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#include "llvm/MC/MCAssembler.h"
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#include "llvm/MC/MCSPIRVObjectWriter.h"
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#include "llvm/MC/MCSection.h"
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#include "llvm/MC/MCValue.h"
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#include "llvm/Support/EndianStream.h"
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using namespace llvm;
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class SPIRVObjectWriter : public MCObjectWriter {
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::support::endian::Writer W;
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/// The target specific SPIR-V writer instance.
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std::unique_ptr<MCSPIRVObjectTargetWriter> TargetObjectWriter;
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public:
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SPIRVObjectWriter(std::unique_ptr<MCSPIRVObjectTargetWriter> MOTW,
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raw_pwrite_stream &OS)
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: W(OS, support::little), TargetObjectWriter(std::move(MOTW)) {}
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~SPIRVObjectWriter() override {}
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private:
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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, uint64_t &FixedValue) override {}
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void executePostLayoutBinding(MCAssembler &Asm,
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const MCAsmLayout &Layout) override {}
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uint64_t writeObject(MCAssembler &Asm, const MCAsmLayout &Layout) override;
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void writeHeader(const MCAssembler &Asm);
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};
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void SPIRVObjectWriter::writeHeader(const MCAssembler &Asm) {
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constexpr uint32_t MagicNumber = 0x07230203;
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// TODO: set the version on a min-necessary basis (just like the translator
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// does) requires some refactoring of MCAssembler::VersionInfoType.
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constexpr uint32_t Major = 1;
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constexpr uint32_t Minor = 0;
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constexpr uint32_t VersionNumber = 0 | (Major << 16) | (Minor << 8);
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// TODO: check if we could use anything other than 0 (spec allows).
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constexpr uint32_t GeneratorMagicNumber = 0;
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// TODO: do not hardcode this as well.
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constexpr uint32_t Bound = 900;
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constexpr uint32_t Schema = 0;
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W.write<uint32_t>(MagicNumber);
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W.write<uint32_t>(VersionNumber);
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W.write<uint32_t>(GeneratorMagicNumber);
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W.write<uint32_t>(Bound);
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W.write<uint32_t>(Schema);
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}
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uint64_t SPIRVObjectWriter::writeObject(MCAssembler &Asm,
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const MCAsmLayout &Layout) {
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uint64_t StartOffset = W.OS.tell();
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writeHeader(Asm);
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for (const MCSection &S : Asm)
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Asm.writeSectionData(W.OS, &S, Layout);
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return W.OS.tell() - StartOffset;
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}
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std::unique_ptr<MCObjectWriter>
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llvm::createSPIRVObjectWriter(std::unique_ptr<MCSPIRVObjectTargetWriter> MOTW,
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raw_pwrite_stream &OS) {
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return std::make_unique<SPIRVObjectWriter>(std::move(MOTW), OS);
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}
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