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Diffstat (limited to 'src/3rdparty/angle/src/compiler/translator/SeparateDeclarations.cpp')
-rw-r--r-- | src/3rdparty/angle/src/compiler/translator/SeparateDeclarations.cpp | 77 |
1 files changed, 77 insertions, 0 deletions
diff --git a/src/3rdparty/angle/src/compiler/translator/SeparateDeclarations.cpp b/src/3rdparty/angle/src/compiler/translator/SeparateDeclarations.cpp new file mode 100644 index 0000000000..d33747f85b --- /dev/null +++ b/src/3rdparty/angle/src/compiler/translator/SeparateDeclarations.cpp @@ -0,0 +1,77 @@ +// +// 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 +{ + +class SeparateDeclarationsTraverser : private TIntermTraverser +{ + public: + static void apply(TIntermNode *root); + private: + SeparateDeclarationsTraverser(); + bool visitAggregate(Visit, TIntermAggregate *node) override; +}; + +void SeparateDeclarationsTraverser::apply(TIntermNode *root) +{ + SeparateDeclarationsTraverser separateDecl; + root->traverse(&separateDecl); + separateDecl.updateTree(); +} + +SeparateDeclarationsTraverser::SeparateDeclarationsTraverser() + : TIntermTraverser(true, false, false) +{ +} + +bool SeparateDeclarationsTraverser::visitAggregate(Visit, TIntermAggregate *node) +{ + if (node->getOp() == EOpDeclaration) + { + TIntermSequence *sequence = node->getSequence(); + if (sequence->size() > 1) + { + TIntermAggregate *parentAgg = getParentNode()->getAsAggregate(); + ASSERT(parentAgg != nullptr); + + TIntermSequence replacementDeclarations; + for (size_t ii = 0; ii < sequence->size(); ++ii) + { + TIntermAggregate *replacementDeclaration = new TIntermAggregate; + + replacementDeclaration->setOp(EOpDeclaration); + replacementDeclaration->getSequence()->push_back(sequence->at(ii)); + replacementDeclaration->setLine(sequence->at(ii)->getLine()); + replacementDeclarations.push_back(replacementDeclaration); + } + + mMultiReplacements.push_back(NodeReplaceWithMultipleEntry(parentAgg, node, replacementDeclarations)); + } + return false; + } + return true; +} + +} // namespace + +void SeparateDeclarations(TIntermNode *root) +{ + SeparateDeclarationsTraverser::apply(root); +} |