SPIRV-Tools/source/instruction.h

// Copyright (c) 2015 The Khronos Group Inc.
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and/or associated documentation files (the
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// permit persons to whom the Materials are furnished to do so, subject to
// the following conditions:
//
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// MODIFICATIONS TO THIS FILE MAY MEAN IT NO LONGER ACCURATELY REFLECTS
// KHRONOS STANDARDS. THE UNMODIFIED, NORMATIVE VERSIONS OF KHRONOS
// SPECIFICATIONS AND HEADER INFORMATION ARE LOCATED AT
//    https://www.khronos.org/registry/
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#ifndef _LIBSPIRV_UTIL_INSTRUCTION_H_
#define _LIBSPIRV_UTIL_INSTRUCTION_H_

#include <cstdint>
#include <vector>

#include <headers/spirv.hpp>

// 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.
  Op 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.
inline void spvInstructionAddWord(spv_instruction_t* inst, uint32_t value) {
  inst->words.push_back(value);
}

#endif  // _LIBSPIRV_UTIL_INSTRUCTION_H_