| // |
| // Copyright (c) 2002-2013 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. |
| // |
| |
| #include "compiler/translator/UnfoldShortCircuitAST.h" |
| |
| namespace sh |
| { |
| |
| namespace |
| { |
| |
| // "x || y" is equivalent to "x ? true : y". |
| TIntermTernary *UnfoldOR(TIntermTyped *x, TIntermTyped *y) |
| { |
| TConstantUnion *u = new TConstantUnion; |
| u->setBConst(true); |
| TIntermConstantUnion *trueNode = |
| new TIntermConstantUnion(u, TType(EbtBool, EbpUndefined, EvqConst, 1)); |
| return new TIntermTernary(x, trueNode, y); |
| } |
| |
| // "x && y" is equivalent to "x ? y : false". |
| TIntermTernary *UnfoldAND(TIntermTyped *x, TIntermTyped *y) |
| { |
| TConstantUnion *u = new TConstantUnion; |
| u->setBConst(false); |
| TIntermConstantUnion *falseNode = |
| new TIntermConstantUnion(u, TType(EbtBool, EbpUndefined, EvqConst, 1)); |
| return new TIntermTernary(x, y, falseNode); |
| } |
| |
| } // namespace anonymous |
| |
| bool UnfoldShortCircuitAST::visitBinary(Visit visit, TIntermBinary *node) |
| { |
| TIntermTernary *replacement = nullptr; |
| |
| switch (node->getOp()) |
| { |
| case EOpLogicalOr: |
| replacement = UnfoldOR(node->getLeft(), node->getRight()); |
| break; |
| case EOpLogicalAnd: |
| replacement = UnfoldAND(node->getLeft(), node->getRight()); |
| break; |
| default: |
| break; |
| } |
| if (replacement) |
| { |
| queueReplacement(replacement, OriginalNode::IS_DROPPED); |
| } |
| return true; |
| } |
| |
| } // namespace sh |