AddAndTrueToLoopCondition.cpp

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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.

//

#include "compiler/translator/tree_ops/apple/AddAndTrueToLoopCondition.h"

#include "compiler/translator/Compiler.h"

#include "compiler/translator/tree_util/IntermNode_util.h"

#include "compiler/translator/tree_util/IntermTraverse.h"

namespace sh

namespace

// An AST traverser that rewrites for and while loops by replacing "condition" with

// "condition && true" to work around condition bug on Intel Mac.

class AddAndTrueToLoopConditionTraverser : public TIntermTraverser

  public:

    AddAndTrueToLoopConditionTraverser() : TIntermTraverser(true, false, false) {}

    bool visitLoop(Visit, TIntermLoop *loop) override

        // do-while loop doesn't have this bug.

        if (loop->getType() != ELoopFor && loop->getType() != ELoopWhile)

            return true;

        // For loop may not have a condition.

        if (loop->getCondition() == nullptr)

            return true;

        // Constant true.

        TIntermTyped *trueValue = CreateBoolNode(true);

        // CONDITION && true.

        TIntermBinary *andOp = new TIntermBinary(EOpLogicalAnd, loop->getCondition(), trueValue);

        loop->setCondition(andOp);

        return true;

};

}  // anonymous namespace

bool AddAndTrueToLoopCondition(TCompiler *compiler, TIntermNode *root)

    AddAndTrueToLoopConditionTraverser traverser;

    root->traverse(&traverser);

    return compiler->validateAST(root);

}  // namespace sh