daniel@transgaming.com | 4f39fd9 | 2010-03-08 20:26:45 +0000 | [diff] [blame] | 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 | // |
| 6 | |
Jamie Madill | b1a85f4 | 2014-08-19 15:23:24 -0400 | [diff] [blame] | 7 | #include "compiler/translator/IntermNode.h" |
daniel@transgaming.com | 4f39fd9 | 2010-03-08 20:26:45 +0000 | [diff] [blame] | 8 | |
| 9 | class TAliveTraverser : public TIntermTraverser { |
| 10 | public: |
| 11 | TAliveTraverser(TQualifier q) : TIntermTraverser(true, false, false, true), found(false), qualifier(q) |
| 12 | { |
| 13 | } |
| 14 | |
| 15 | bool wasFound() { return found; } |
| 16 | |
| 17 | protected: |
| 18 | bool found; |
| 19 | TQualifier qualifier; |
| 20 | |
| 21 | void visitSymbol(TIntermSymbol*); |
| 22 | bool visitSelection(Visit, TIntermSelection*); |
| 23 | }; |
| 24 | |
| 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); |
| 36 | |
| 37 | if (node) |
| 38 | node->traverse(&it); |
| 39 | |
| 40 | return it.wasFound(); |
| 41 | } |
| 42 | |
| 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 | } |
| 51 | |
| 52 | bool TAliveTraverser::visitSelection(Visit preVisit, TIntermSelection* node) |
| 53 | { |
| 54 | if (wasFound()) |
| 55 | return false; |
| 56 | |
| 57 | return true; |
| 58 | } |