1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
|
/*
* Copyright (C) 2012 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef GetByIdStatus_h
#define GetByIdStatus_h
#include "PropertyOffset.h"
#include "StructureSet.h"
#include <wtf/NotFound.h>
namespace JSC {
class CodeBlock;
class Identifier;
class GetByIdStatus {
public:
enum State {
NoInformation, // It's uncached so we have no information.
Simple, // It's cached for a simple access to a known object property with
// a possible structure chain and a possible specific value.
TakesSlowPath, // It's known to often take slow path.
MakesCalls // It's known to take paths that make calls.
};
GetByIdStatus()
: m_state(NoInformation)
, m_offset(invalidOffset)
{
}
GetByIdStatus(
State state, bool wasSeenInJIT, const StructureSet& structureSet = StructureSet(),
PropertyOffset offset = invalidOffset, JSValue specificValue = JSValue(), Vector<Structure*> chain = Vector<Structure*>())
: m_state(state)
, m_structureSet(structureSet)
, m_chain(chain)
, m_specificValue(specificValue)
, m_offset(offset)
, m_wasSeenInJIT(wasSeenInJIT)
{
ASSERT((state == Simple) == (offset != invalidOffset));
}
static GetByIdStatus computeFor(CodeBlock*, unsigned bytecodeIndex, Identifier&);
State state() const { return m_state; }
bool isSet() const { return m_state != NoInformation; }
bool operator!() const { return !isSet(); }
bool isSimple() const { return m_state == Simple; }
bool takesSlowPath() const { return m_state == TakesSlowPath || m_state == MakesCalls; }
bool makesCalls() const { return m_state == MakesCalls; }
const StructureSet& structureSet() const { return m_structureSet; }
const Vector<Structure*>& chain() const { return m_chain; } // Returns empty vector if this is a direct access.
JSValue specificValue() const { return m_specificValue; } // Returns JSValue() if there is no specific value.
PropertyOffset offset() const { return m_offset; }
bool wasSeenInJIT() const { return m_wasSeenInJIT; }
private:
static void computeForChain(GetByIdStatus& result, CodeBlock*, Identifier&, Structure*);
static GetByIdStatus computeFromLLInt(CodeBlock*, unsigned bytecodeIndex, Identifier&);
State m_state;
StructureSet m_structureSet;
Vector<Structure*> m_chain;
JSValue m_specificValue;
PropertyOffset m_offset;
bool m_wasSeenInJIT;
};
} // namespace JSC
#endif // PropertyAccessStatus_h
|
