source/instruction.h

// Copyright (c) 2015-2016 The Khronos Group Inc.
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#ifndef LIBSPIRV_INSTRUCTION_H_
#define LIBSPIRV_INSTRUCTION_H_

#include <cstdint>
#include <vector>

#include "spirv/spirv.h"

#include "table.h"

// Describes an instruction.
struct spv_instruction_t {
  // Normally, both opcode and extInstType contain valid data.
  // However, when the assembler parses !<number> as the first word in
  // an instruction and opcode and extInstType are invalid.
  SpvOp opcode;
  spv_ext_inst_type_t extInstType;

  // The Id of the result type, if this instruction has one.  Zero otherwise.
  uint32_t resultTypeId;

  // The instruction, as a sequence of 32-bit words.
  // For a regular instruction the opcode and word count are combined
  // in words[0], as described in the SPIR-V spec.
  // Otherwise, the first token was !<number>, and that number appears
  // in words[0].  Subsequent elements are the result of parsing
  // tokens in the alternate parsing mode as described in syntax.md.
  std::vector<uint32_t> words;
};

// Appends a word to an instruction, without checking for overflow.
void spvInstructionAddWord(spv_instruction_t* inst, uint32_t value);

#endif  // LIBSPIRV_INSTRUCTION_H_