src/tint/writer/spirv/binary_writer.h

// Copyright 2020 The Tint Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

#ifndef SRC_TINT_WRITER_SPIRV_BINARY_WRITER_H_
#define SRC_TINT_WRITER_SPIRV_BINARY_WRITER_H_

#include <vector>

#include "src/tint/writer/spirv/builder.h"

namespace tint::writer::spirv {

/// Writer to convert from builder to SPIR-V binary
class BinaryWriter {
  public:
    /// Constructor
    BinaryWriter();
    ~BinaryWriter();

    /// Writes the SPIR-V header.
    /// @param bound the bound to output
    void WriteHeader(uint32_t bound);

    /// Writes the given builder data into a binary. Note, this does not emit
    /// the SPIR-V header. You **must** call WriteHeader() before WriteBuilder()
    /// if you want the SPIR-V to be emitted.
    /// @param builder the builder to assemble from
    void WriteBuilder(Builder* builder);

    /// Writes the given instruction into the binary.
    /// @param inst the instruction to assemble
    void WriteInstruction(const Instruction& inst);

    /// @returns the assembled SPIR-V
    const std::vector<uint32_t>& result() const { return out_; }

    /// @returns the assembled SPIR-V
    std::vector<uint32_t>& result() { return out_; }

  private:
    void process_instruction(const Instruction& inst);
    void process_op(const Operand& op);

    std::vector<uint32_t> out_;
};

}  // namespace tint::writer::spirv

#endif  // SRC_TINT_WRITER_SPIRV_BINARY_WRITER_H_