IntermNodePatternMatcher.h

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//

// Copyright 2016 The ANGLE Project Authors. All rights reserved.

// Use of this source code is governed by a BSD-style license that can be

// found in the LICENSE file.

//

// IntermNodePatternMatcher is a helper class for matching node trees to given patterns.

// It can be used whenever the same checks for certain node structures are common to multiple AST

// traversers.

//

#ifndef COMPILER_TRANSLATOR_TREEUTIL_INTERMNODEPATTERNMATCHER_H_

#define COMPILER_TRANSLATOR_TREEUTIL_INTERMNODEPATTERNMATCHER_H_

namespace sh

class TIntermAggregate;

class TIntermBinary;

class TIntermDeclaration;

class TIntermNode;

class TIntermTernary;

class TIntermUnary;

class IntermNodePatternMatcher

  public:

    static bool IsDynamicIndexingOfNonSSBOVectorOrMatrix(TIntermBinary *node);

    static bool IsDynamicIndexingOfVectorOrMatrix(TIntermBinary *node);

    static bool IsDynamicIndexingOfSwizzledVector(TIntermBinary *node);

    enum PatternType : unsigned int

        // Matches expressions that are unfolded to if statements by UnfoldShortCircuitToIf

        kUnfoldedShortCircuitExpression = 1u << 0u,

        // Matches expressions that return arrays with the exception of simple statements where a

        // constructor or function call result is assigned.

        kExpressionReturningArray = 1u << 1u,

        // Matches dynamic indexing of vectors or matrices in l-values.

        kDynamicIndexingOfVectorOrMatrixInLValue = 1u << 2u,

        // Matches declarations with more than one declared variables.

        kMultiDeclaration = 1u << 3u,

        // Matches declarations of arrays.

        kArrayDeclaration = 1u << 4u,

        // Matches declarations of structs where the struct type does not have a name.

        kNamelessStructDeclaration = 1u << 5u,

        // Matches array length() method.

        kArrayLengthMethod = 1u << 6u,

        // Matches a vector or matrix constructor whose arguments are scalarized by the

        // scalarizeVecOrMatConstructorArguments workaround.

        kScalarizedVecOrMatConstructor = 1u << 7u,

};

    IntermNodePatternMatcher(const unsigned int mask);

    bool match(TIntermUnary *node) const;

    bool match(TIntermBinary *node, TIntermNode *parentNode) const;

    // Use this version for checking binary node matches in case you're using flag

    // kDynamicIndexingOfVectorOrMatrixInLValue.

    bool match(TIntermBinary *node, TIntermNode *parentNode, bool isLValueRequiredHere) const;

    bool match(TIntermAggregate *node, TIntermNode *parentNode) const;

    bool match(TIntermTernary *node) const;

    bool match(TIntermDeclaration *node) const;

  private:

    const unsigned int mMask;

    bool matchInternal(TIntermBinary *node, TIntermNode *parentNode) const;

};

}  // namespace sh

#endif  // COMPILER_TRANSLATOR_TREEUTIL_INTERMNODEPATTERNMATCHER_H_