Olli Etuaho | c1f14fb | 2017-10-28 19:17:23 +0300 | [diff] [blame^] | 1 | // |
| 2 | // Copyright (c) 2017 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 | // RemoveEmptySwitchStatements.cpp: Remove switch statements that have an empty statement list. |
| 7 | |
| 8 | #include "compiler/translator/RemoveEmptySwitchStatements.h" |
| 9 | |
| 10 | #include "compiler/translator/IntermTraverse.h" |
| 11 | |
| 12 | namespace sh |
| 13 | { |
| 14 | |
| 15 | namespace |
| 16 | { |
| 17 | |
| 18 | class RemoveEmptySwitchStatementsTraverser : public TIntermTraverser |
| 19 | { |
| 20 | public: |
| 21 | RemoveEmptySwitchStatementsTraverser() : TIntermTraverser(true, false, false) {} |
| 22 | |
| 23 | bool visitSwitch(Visit visit, TIntermSwitch *node); |
| 24 | }; |
| 25 | |
| 26 | bool RemoveEmptySwitchStatementsTraverser::visitSwitch(Visit visit, TIntermSwitch *node) |
| 27 | { |
| 28 | if (node->getStatementList()->getSequence()->empty()) |
| 29 | { |
| 30 | // Just output the init statement. |
| 31 | if (node->getInit()->hasSideEffects()) |
| 32 | { |
| 33 | queueReplacement(node->getInit(), OriginalNode::IS_DROPPED); |
| 34 | } |
| 35 | else |
| 36 | { |
| 37 | TIntermSequence emptyReplacement; |
| 38 | ASSERT(getParentNode()->getAsBlock()); |
| 39 | mMultiReplacements.push_back(NodeReplaceWithMultipleEntry(getParentNode()->getAsBlock(), |
| 40 | node, emptyReplacement)); |
| 41 | } |
| 42 | return false; // Nothing inside the child nodes to traverse. |
| 43 | } |
| 44 | return true; |
| 45 | } |
| 46 | |
| 47 | } // anonymous namespace |
| 48 | |
| 49 | void RemoveEmptySwitchStatements(TIntermBlock *root) |
| 50 | { |
| 51 | RemoveEmptySwitchStatementsTraverser traverser; |
| 52 | root->traverse(&traverser); |
| 53 | traverser.updateTree(); |
| 54 | } |
| 55 | |
| 56 | } // namespace sh |