1/*
2 * Copyright (C) 2013, 2014 Apple Inc. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 *    notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 *    notice, this list of conditions and the following disclaimer in the
11 *    documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
17 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
18 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
20 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
21 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
23 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26#include "config.h"
27#include "DFGBasicBlock.h"
28
29#if ENABLE(DFG_JIT)
30
31#include "JSCInlines.h"
32
33namespace JSC { namespace DFG {
34
35BasicBlock::BasicBlock(
36    unsigned bytecodeBegin, unsigned numArguments, unsigned numLocals, float executionCount)
37    : bytecodeBegin(bytecodeBegin)
38    , index(NoBlock)
39    , isOSRTarget(false)
40    , cfaHasVisited(false)
41    , cfaShouldRevisit(false)
42    , cfaFoundConstants(false)
43    , cfaDidFinish(true)
44    , cfaBranchDirection(InvalidBranchDirection)
45#if !ASSERT_DISABLED
46    , isLinked(false)
47#endif
48    , isReachable(false)
49    , variablesAtHead(numArguments, numLocals)
50    , variablesAtTail(numArguments, numLocals)
51    , valuesAtHead(numArguments, numLocals)
52    , valuesAtTail(numArguments, numLocals)
53    , executionCount(executionCount)
54{
55}
56
57BasicBlock::~BasicBlock() { }
58
59void BasicBlock::ensureLocals(unsigned newNumLocals)
60{
61    variablesAtHead.ensureLocals(newNumLocals);
62    variablesAtTail.ensureLocals(newNumLocals);
63    valuesAtHead.ensureLocals(newNumLocals);
64    valuesAtTail.ensureLocals(newNumLocals);
65}
66
67bool BasicBlock::isInPhis(Node* node) const
68{
69    for (size_t i = 0; i < phis.size(); ++i) {
70        if (phis[i] == node)
71            return true;
72    }
73    return false;
74}
75
76bool BasicBlock::isInBlock(Node* myNode) const
77{
78    for (size_t i = 0; i < numNodes(); ++i) {
79        if (node(i) == myNode)
80            return true;
81    }
82    return false;
83}
84
85void BasicBlock::removePredecessor(BasicBlock* block)
86{
87    for (unsigned i = 0; i < predecessors.size(); ++i) {
88        if (predecessors[i] != block)
89            continue;
90        predecessors[i] = predecessors.last();
91        predecessors.removeLast();
92        return;
93    }
94    RELEASE_ASSERT_NOT_REACHED();
95}
96
97void BasicBlock::replacePredecessor(BasicBlock* from, BasicBlock* to)
98{
99    for (unsigned i = predecessors.size(); i--;) {
100        if (predecessors[i] != from)
101            continue;
102        predecessors[i] = to;
103        return;
104    }
105    RELEASE_ASSERT_NOT_REACHED();
106}
107
108void BasicBlock::dump(PrintStream& out) const
109{
110    out.print("#", index);
111}
112
113BasicBlock::SSAData::SSAData(BasicBlock* block)
114    : availabilityAtHead(OperandsLike, block->variablesAtHead)
115    , availabilityAtTail(OperandsLike, block->variablesAtHead)
116{
117}
118
119BasicBlock::SSAData::~SSAData() { }
120
121} } // namespace JSC::DFG
122
123#endif // ENABLE(DFG_JIT)
124
125