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authorMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
committerMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
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Add m-esr52 at 52.6.0
Diffstat (limited to 'gfx/angle/src/compiler/translator/SeparateDeclarations.cpp')
-rwxr-xr-xgfx/angle/src/compiler/translator/SeparateDeclarations.cpp78
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diff --git a/gfx/angle/src/compiler/translator/SeparateDeclarations.cpp b/gfx/angle/src/compiler/translator/SeparateDeclarations.cpp
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+//
+// Copyright (c) 2002-2015 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.
+//
+// The SeparateDeclarations function processes declarations, so that in the end each declaration
+// contains only one declarator.
+// This is useful as an intermediate step when initialization needs to be separated from declaration,
+// or when things need to be unfolded out of the initializer.
+// Example:
+// int a[1] = int[1](1), b[1] = int[1](2);
+// gets transformed when run through this class into the AST equivalent of:
+// int a[1] = int[1](1);
+// int b[1] = int[1](2);
+
+#include "compiler/translator/SeparateDeclarations.h"
+
+#include "compiler/translator/IntermNode.h"
+
+namespace sh
+{
+
+namespace
+{
+
+class SeparateDeclarationsTraverser : private TIntermTraverser
+{
+ public:
+ static void apply(TIntermNode *root);
+ private:
+ SeparateDeclarationsTraverser();
+ bool visitDeclaration(Visit, TIntermDeclaration *node) override;
+};
+
+void SeparateDeclarationsTraverser::apply(TIntermNode *root)
+{
+ SeparateDeclarationsTraverser separateDecl;
+ root->traverse(&separateDecl);
+ separateDecl.updateTree();
+}
+
+SeparateDeclarationsTraverser::SeparateDeclarationsTraverser()
+ : TIntermTraverser(true, false, false)
+{
+}
+
+bool SeparateDeclarationsTraverser::visitDeclaration(Visit, TIntermDeclaration *node)
+{
+ TIntermSequence *sequence = node->getSequence();
+ if (sequence->size() > 1)
+ {
+ TIntermBlock *parentBlock = getParentNode()->getAsBlock();
+ ASSERT(parentBlock != nullptr);
+
+ TIntermSequence replacementDeclarations;
+ for (size_t ii = 0; ii < sequence->size(); ++ii)
+ {
+ TIntermDeclaration *replacementDeclaration = new TIntermDeclaration();
+
+ replacementDeclaration->appendDeclarator(sequence->at(ii)->getAsTyped());
+ replacementDeclaration->setLine(sequence->at(ii)->getLine());
+ replacementDeclarations.push_back(replacementDeclaration);
+ }
+
+ mMultiReplacements.push_back(
+ NodeReplaceWithMultipleEntry(parentBlock, node, replacementDeclarations));
+ }
+ return false;
+}
+
+} // namespace
+
+void SeparateDeclarations(TIntermNode *root)
+{
+ SeparateDeclarationsTraverser::apply(root);
+}
+
+} // namespace sh