diff options
Diffstat (limited to 'src/3rdparty/angle/src/compiler/translator/RemoveEmptySwitchStatements.cpp')
-rw-r--r-- | src/3rdparty/angle/src/compiler/translator/RemoveEmptySwitchStatements.cpp | 56 |
1 files changed, 56 insertions, 0 deletions
diff --git a/src/3rdparty/angle/src/compiler/translator/RemoveEmptySwitchStatements.cpp b/src/3rdparty/angle/src/compiler/translator/RemoveEmptySwitchStatements.cpp new file mode 100644 index 0000000000..b39c912e9c --- /dev/null +++ b/src/3rdparty/angle/src/compiler/translator/RemoveEmptySwitchStatements.cpp @@ -0,0 +1,56 @@ +// +// Copyright (c) 2017 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. +// +// RemoveEmptySwitchStatements.cpp: Remove switch statements that have an empty statement list. + +#include "compiler/translator/RemoveEmptySwitchStatements.h" + +#include "compiler/translator/IntermTraverse.h" + +namespace sh +{ + +namespace +{ + +class RemoveEmptySwitchStatementsTraverser : public TIntermTraverser +{ + public: + RemoveEmptySwitchStatementsTraverser() : TIntermTraverser(true, false, false) {} + + bool visitSwitch(Visit visit, TIntermSwitch *node); +}; + +bool RemoveEmptySwitchStatementsTraverser::visitSwitch(Visit visit, TIntermSwitch *node) +{ + if (node->getStatementList()->getSequence()->empty()) + { + // Just output the init statement. + if (node->getInit()->hasSideEffects()) + { + queueReplacement(node->getInit(), OriginalNode::IS_DROPPED); + } + else + { + TIntermSequence emptyReplacement; + ASSERT(getParentNode()->getAsBlock()); + mMultiReplacements.push_back(NodeReplaceWithMultipleEntry(getParentNode()->getAsBlock(), + node, emptyReplacement)); + } + return false; // Nothing inside the child nodes to traverse. + } + return true; +} + +} // anonymous namespace + +void RemoveEmptySwitchStatements(TIntermBlock *root) +{ + RemoveEmptySwitchStatementsTraverser traverser; + root->traverse(&traverser); + traverser.updateTree(); +} + +} // namespace sh |