ir-util.h - mozsearch

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/*

 * Copyright 2016 WebAssembly Community Group participants

 * 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 WABT_IR_UTIL_H_

#define WABT_IR_UTIL_H_

#include "wabt/common.h"

#include "wabt/ir.h"

namespace wabt {

struct Label {

  Label(LabelType label_type,

        const std::string& name,

        const TypeVector& param_types,

        const TypeVector& result_types)

      : name(name),

        label_type(label_type),

        param_types(param_types),

        result_types(result_types) {}

  std::string name;

  LabelType label_type;

  TypeVector param_types;

  TypeVector result_types;

};

struct ModuleContext {

  ModuleContext(const Module& module) : module(module) {}

  Index GetLabelStackSize() const { return label_stack_.size(); }

  const Label* GetLabel(const Var& var) const;

  Index GetLabelArity(const Var& var) const;

  void SetTopLabelType(LabelType label_type) {

    label_stack_.back().label_type = label_type;

  Index GetFuncParamCount(const Var& var) const;

  Index GetFuncResultCount(const Var& var) const;

  void BeginBlock(LabelType label_type, const Block& block);

  void EndBlock();

  void BeginFunc(const Func& func);

  void EndFunc();

  struct Arities {

    Index nargs;

    Index nreturns;

    bool unreachable;

    Arities(Index na, Index nr, bool ur = false)

        : nargs(na), nreturns(nr), unreachable(ur) {}

};

  Arities GetExprArity(const Expr& expr) const;

  const Module& module;

 private:

  const Func* current_func_ = nullptr;

  std::vector<Label> label_stack_;

};

}  // namespace wabt

#endif /* WABT_IR_UTIL_H_ */