The Tor Browser: gfx/angle/src/compiler/QualifierAlive.cpp@141e0f1194b1

     1 //

     2 // Copyright (c) 2002-2010 The ANGLE Project Authors. All rights reserved.

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

     4 // found in the LICENSE file.

     5 //

     7 #include "compiler/intermediate.h"

     9 class TAliveTraverser : public TIntermTraverser {

    10 public:

    11     TAliveTraverser(TQualifier q) : TIntermTraverser(true, false, false, true), found(false), qualifier(q)

    12     {

    13     }

    15 	bool wasFound() { return found; }

    17 protected:

    18     bool found;

    19     TQualifier qualifier;

    21     void visitSymbol(TIntermSymbol*);

    22     bool visitSelection(Visit, TIntermSelection*);

    23 };

    25 //

    26 // Report whether or not a variable of the given qualifier type

    27 // is guaranteed written.  Not always possible to determine if

    28 // it is written conditionally.

    29 //

    30 // ?? It does not do this well yet, this is just a place holder

    31 // that simply determines if it was reference at all, anywhere.

    32 //

    33 bool QualifierWritten(TIntermNode* node, TQualifier qualifier)

    34 {

    35     TAliveTraverser it(qualifier);

    37     if (node)

    38         node->traverse(&it);

    40     return it.wasFound();

    41 }

    43 void TAliveTraverser::visitSymbol(TIntermSymbol* node)

    44 {

    45     //

    46     // If it's what we're looking for, record it.

    47     //

    48     if (node->getQualifier() == qualifier)

    49         found = true;

    50 }

    52 bool TAliveTraverser::visitSelection(Visit preVisit, TIntermSelection* node)

    53 {

    54     if (wasFound())

    55         return false;

    57     return true;

    58 }

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