115 lines
3.9 KiB
C++
115 lines
3.9 KiB
C++
/*
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* Copyright (C) 2016 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef CONSTANT_EXPRESSION_H_
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#define CONSTANT_EXPRESSION_H_
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#include <android-base/macros.h>
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#include <string>
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#include "ScalarType.h"
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namespace android {
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/**
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* A constant expression is represented by a tree.
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*/
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struct ConstantExpression {
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enum ConstExprType {
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kConstExprLiteral,
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kConstExprUnary,
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kConstExprBinary,
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kConstExprTernary
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};
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/* Default constructor. */
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ConstantExpression();
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/* Copy constructor. */
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ConstantExpression(const ConstantExpression& other);
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/* Copy constructor, with the expr overriden. */
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ConstantExpression(const ConstantExpression& other, std::string expr);
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/* Literals */
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ConstantExpression(const char *value);
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/* binary operations */
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ConstantExpression(const ConstantExpression *value1,
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const char *op, const ConstantExpression* value2);
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/* unary operations */
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ConstantExpression(const char *op, const ConstantExpression *value);
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/* ternary ?: */
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ConstantExpression(const ConstantExpression *cond,
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const ConstantExpression *trueVal,
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const ConstantExpression *falseVal);
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static ConstantExpression Zero(ScalarType::Kind kind);
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static ConstantExpression One(ScalarType::Kind kind);
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static ConstantExpression ValueOf(ScalarType::Kind kind, uint64_t value);
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/* Evaluated result in a string form. */
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std::string value() const;
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/* Evaluated result in a string form. */
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std::string cppValue() const;
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/* Evaluated result in a string form. */
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std::string javaValue() const;
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/* Evaluated result in a string form, with given contextual kind. */
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std::string value(ScalarType::Kind castKind) const;
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/* Evaluated result in a string form, with given contextual kind. */
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std::string cppValue(ScalarType::Kind castKind) const;
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/* Evaluated result in a string form, with given contextual kind. */
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std::string javaValue(ScalarType::Kind castKind) const;
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/* Original expression with type. */
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const std::string &description() const;
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/* See mTrivialDescription */
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bool descriptionIsTrivial() const;
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/* Return a ConstantExpression that is 1 plus the original. */
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ConstantExpression addOne() const;
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/* Assignment operator. */
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ConstantExpression& operator=(const ConstantExpression& other);
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size_t castSizeT() const;
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private:
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/* The formatted expression. */
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std::string mExpr;
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/* The type of the expression. Hints on its original form. */
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ConstExprType mType;
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/* The kind of the result value. */
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ScalarType::Kind mValueKind;
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/* The stored result value. */
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uint64_t mValue;
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/* true if description() does not offer more information than value(). */
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bool mTrivialDescription = false;
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/*
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* Helper function for all cpp/javaValue methods.
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* Returns a plain string (without any prefixes or suffixes, just the
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* digits) converted from mValue.
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*/
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std::string rawValue(ScalarType::Kind castKind) const;
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/* Trim unnecessary information. Only mValue and mValueKind is kept. */
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ConstantExpression &toLiteral();
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/*
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* Return the value casted to the given type.
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* First cast it according to mValueKind, then cast it to T.
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* Assumes !containsIdentifiers()
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*/
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template <typename T> T cast() const;
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};
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} // namespace android
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#endif // CONSTANT_EXPRESSION_H_
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