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/*
* Copyright (C) 2015 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 GetPutInfo_h
#define GetPutInfo_h
#include <wtf/text/UniquedStringImpl.h>
namespace JSC {
class Structure;
class WatchpointSet;
class JSLexicalEnvironment;
enum ResolveMode {
ThrowIfNotFound,
DoNotThrowIfNotFound
};
enum ResolveType {
// Lexical scope guaranteed a certain type of variable access.
GlobalProperty,
GlobalVar,
GlobalLexicalVar,
ClosureVar,
LocalClosureVar,
ModuleVar,
// Ditto, but at least one intervening scope used non-strict eval, which
// can inject an intercepting var delcaration at runtime.
GlobalPropertyWithVarInjectionChecks,
GlobalVarWithVarInjectionChecks,
GlobalLexicalVarWithVarInjectionChecks,
ClosureVarWithVarInjectionChecks,
// We haven't found which scope this belongs to, and we also
// haven't ruled out the possibility of it being cached. Ideally,
// we want to transition this to GlobalVar/GlobalLexicalVar/GlobalProperty <with/without injection>
UnresolvedProperty,
UnresolvedPropertyWithVarInjectionChecks,
// Lexical scope didn't prove anything -- probably because of a 'with' scope.
Dynamic
};
enum InitializationMode {
Initialization, // "let x = 20;"
NotInitialization // "x = 20;"
};
ALWAYS_INLINE const char* resolveModeName(ResolveMode resolveMode)
{
static const char* const names[] = {
"ThrowIfNotFound",
"DoNotThrowIfNotFound"
};
return names[resolveMode];
}
ALWAYS_INLINE const char* resolveTypeName(ResolveType type)
{
static const char* const names[] = {
"GlobalProperty",
"GlobalVar",
"GlobalLexicalVar",
"ClosureVar",
"LocalClosureVar",
"ModuleVar",
"GlobalPropertyWithVarInjectionChecks",
"GlobalVarWithVarInjectionChecks",
"GlobalLexicalVarWithVarInjectionChecks",
"ClosureVarWithVarInjectionChecks",
"UnresolvedProperty",
"UnresolvedPropertyWithVarInjectionChecks",
"Dynamic"
};
return names[type];
}
ALWAYS_INLINE const char* initializationModeName(InitializationMode initializationMode)
{
static const char* const names[] = {
"Initialization",
"NotInitialization"
};
return names[initializationMode];
}
ALWAYS_INLINE ResolveType makeType(ResolveType type, bool needsVarInjectionChecks)
{
if (!needsVarInjectionChecks)
return type;
switch (type) {
case GlobalProperty:
return GlobalPropertyWithVarInjectionChecks;
case GlobalVar:
return GlobalVarWithVarInjectionChecks;
case GlobalLexicalVar:
return GlobalLexicalVarWithVarInjectionChecks;
case ClosureVar:
case LocalClosureVar:
return ClosureVarWithVarInjectionChecks;
case UnresolvedProperty:
return UnresolvedPropertyWithVarInjectionChecks;
case ModuleVar:
case GlobalPropertyWithVarInjectionChecks:
case GlobalVarWithVarInjectionChecks:
case GlobalLexicalVarWithVarInjectionChecks:
case ClosureVarWithVarInjectionChecks:
case UnresolvedPropertyWithVarInjectionChecks:
case Dynamic:
return type;
}
RELEASE_ASSERT_NOT_REACHED();
return type;
}
ALWAYS_INLINE bool needsVarInjectionChecks(ResolveType type)
{
switch (type) {
case GlobalProperty:
case GlobalVar:
case GlobalLexicalVar:
case ClosureVar:
case LocalClosureVar:
case ModuleVar:
case UnresolvedProperty:
return false;
case GlobalPropertyWithVarInjectionChecks:
case GlobalVarWithVarInjectionChecks:
case GlobalLexicalVarWithVarInjectionChecks:
case ClosureVarWithVarInjectionChecks:
case UnresolvedPropertyWithVarInjectionChecks:
case Dynamic:
return true;
default:
RELEASE_ASSERT_NOT_REACHED();
return true;
}
}
struct ResolveOp {
ResolveOp(ResolveType type, size_t depth, Structure* structure, JSLexicalEnvironment* lexicalEnvironment, WatchpointSet* watchpointSet, uintptr_t operand, UniquedStringImpl* importedName = nullptr)
: type(type)
, depth(depth)
, structure(structure)
, lexicalEnvironment(lexicalEnvironment)
, watchpointSet(watchpointSet)
, operand(operand)
, importedName(importedName)
{
}
ResolveType type;
size_t depth;
Structure* structure;
JSLexicalEnvironment* lexicalEnvironment;
WatchpointSet* watchpointSet;
uintptr_t operand;
RefPtr<UniquedStringImpl> importedName;
};
class GetPutInfo {
typedef unsigned Operand;
public:
// Give each field 10 bits for simplicity.
static_assert(sizeof(Operand) * 8 > 30, "Not enough bits for GetPutInfo");
static const unsigned modeShift = 20;
static const unsigned initializationShift = 10;
static const unsigned typeBits = (1 << initializationShift) - 1;
static const unsigned initializationBits = ((1 << modeShift) - 1) & ~typeBits;
static const unsigned modeBits = ((1 << 30) - 1) & ~initializationBits & ~typeBits;
static_assert((modeBits & initializationBits & typeBits) == 0x0, "There should be no intersection between ResolveMode ResolveType and InitializationMode");
GetPutInfo(ResolveMode resolveMode, ResolveType resolveType, InitializationMode initializationMode)
: m_operand((resolveMode << modeShift) | (initializationMode << initializationShift) | resolveType)
{
}
explicit GetPutInfo(unsigned operand)
: m_operand(operand)
{
}
ResolveType resolveType() const { return static_cast<ResolveType>(m_operand & typeBits); }
InitializationMode initializationMode() const { return static_cast<InitializationMode>((m_operand & initializationBits) >> initializationShift); }
ResolveMode resolveMode() const { return static_cast<ResolveMode>((m_operand & modeBits) >> modeShift); }
unsigned operand() { return m_operand; }
private:
Operand m_operand;
};
enum GetOrPut { Get, Put };
} // namespace JSC
#endif // GetPutInfo_h
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