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-rw-r--r--src/3rdparty/angle/src/compiler/translator/RemoveEmptySwitchStatements.cpp56
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