SPIRV-Tools/source/validate_cfg.cpp

// Copyright (c) 2015-2016 The Khronos Group Inc.
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#include "validate_passes.h"

namespace libspirv {

// TODO(umar): Support for merge instructions
// TODO(umar): Structured control flow checks
spv_result_t CfgPass(ValidationState_t& _,
                     const spv_parsed_instruction_t* inst) {
  if (_.getLayoutSection() == kLayoutFunctionDefinitions) {
    SpvOp opcode = static_cast<SpvOp>(inst->opcode);
    switch (opcode) {
      case SpvOpLabel:
        spvCheckReturn(_.get_functions().RegisterBlock(inst->result_id));
        break;
      case SpvOpBranch:
      case SpvOpBranchConditional:
      case SpvOpSwitch:
      case SpvOpKill:
      case SpvOpReturn:
      case SpvOpReturnValue:
      case SpvOpUnreachable:
        spvCheckReturn(_.get_functions().RegisterBlockEnd());
        break;
      default:
        break;
    }
  }
  return SPV_SUCCESS;
}
}