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/*
* 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.
*/
#include "config.h"
#include "DFGArrayMode.h"
#if ENABLE(DFG_JIT)
#include "DFGAbstractValue.h"
namespace JSC { namespace DFG {
Array::Mode fromObserved(ArrayModes modes, bool makeSafe)
{
// FIXME: we may want to add some polymorphic support in the future. That's why this
// is a switch statement right now.
switch (modes) {
case 0:
return Array::Undecided;
case IsJSArray:
return makeSafe ? Array::JSArrayOutOfBounds : Array::JSArray;
default:
// We know that this is possibly a kind of array for which, though there is no
// useful data in the array profile, we may be able to extract useful data from
// the value profiles of the inputs. Hence, we leave it as undecided, and let
// the predictions propagator decide later.
return Array::Undecided;
}
}
Array::Mode fromStructure(Structure* structure, bool makeSafe)
{
return fromObserved(arrayModeFromStructure(structure), makeSafe);
}
Array::Mode refineArrayMode(Array::Mode arrayMode, SpeculatedType base, SpeculatedType index)
{
if (!base || !index) {
// It can be that we had a legitimate arrayMode but no incoming predictions. That'll
// happen if we inlined code based on, say, a global variable watchpoint, but later
// realized that the callsite could not have possibly executed. It may be worthwhile
// to fix that, but for now I'm leaving it as-is.
return Array::ForceExit;
}
if (!isInt32Speculation(index) || !isCellSpeculation(base))
return Array::Generic;
if (arrayMode != Array::Undecided)
return arrayMode;
if (isStringSpeculation(base))
return Array::String;
if (isArgumentsSpeculation(base))
return Array::Arguments;
if (isInt8ArraySpeculation(base))
return Array::Int8Array;
if (isInt16ArraySpeculation(base))
return Array::Int16Array;
if (isInt32ArraySpeculation(base))
return Array::Int32Array;
if (isUint8ArraySpeculation(base))
return Array::Uint8Array;
if (isUint8ClampedArraySpeculation(base))
return Array::Uint8ClampedArray;
if (isUint16ArraySpeculation(base))
return Array::Uint16Array;
if (isUint32ArraySpeculation(base))
return Array::Uint32Array;
if (isFloat32ArraySpeculation(base))
return Array::Float32Array;
if (isFloat64ArraySpeculation(base))
return Array::Float64Array;
return Array::Generic;
}
bool modeAlreadyChecked(AbstractValue& value, Array::Mode arrayMode)
{
switch (arrayMode) {
case Array::Generic:
return true;
case Array::ForceExit:
return false;
case Array::String:
return isStringSpeculation(value.m_type);
case Array::JSArray:
case Array::JSArrayOutOfBounds:
return value.m_currentKnownStructure.hasSingleton()
&& value.m_currentKnownStructure.singleton()->classInfo() == &JSArray::s_info;
case Array::Arguments:
return isArgumentsSpeculation(value.m_type);
case Array::Int8Array:
return isInt8ArraySpeculation(value.m_type);
case Array::Int16Array:
return isInt16ArraySpeculation(value.m_type);
case Array::Int32Array:
return isInt32ArraySpeculation(value.m_type);
case Array::Uint8Array:
return isUint8ArraySpeculation(value.m_type);
case Array::Uint8ClampedArray:
return isUint8ClampedArraySpeculation(value.m_type);
case Array::Uint16Array:
return isUint16ArraySpeculation(value.m_type);
case Array::Uint32Array:
return isUint32ArraySpeculation(value.m_type);
case Array::Float32Array:
return isFloat32ArraySpeculation(value.m_type);
case Array::Float64Array:
return isFloat64ArraySpeculation(value.m_type);
case Array::Undecided:
break;
}
ASSERT_NOT_REACHED();
return false;
}
const char* modeToString(Array::Mode mode)
{
switch (mode) {
case Array::Undecided:
return "Undecided";
case Array::Generic:
return "Generic";
case Array::ForceExit:
return "ForceExit";
case Array::String:
return "String";
case Array::JSArray:
return "JSArray";
case Array::JSArrayOutOfBounds:
return "JSArrayOutOfBounds";
case Array::Arguments:
return "Arguments";
case Array::Int8Array:
return "Int8Array";
case Array::Int16Array:
return "Int16Array";
case Array::Int32Array:
return "Int32Array";
case Array::Uint8Array:
return "Uint8Array";
case Array::Uint8ClampedArray:
return "Uint8ClampedArray";
case Array::Uint16Array:
return "Uint16Array";
case Array::Uint32Array:
return "Uint32Array";
case Array::Float32Array:
return "Float32Array";
case Array::Float64Array:
return "Float64Array";
default:
// Better to return something then it is to crash. Remember, this method
// is being called from our main diagnostic tool, the IR dumper. It's like
// a stack trace. So if we get here then probably something has already
// gone wrong.
return "Unknown!";
}
}
} } // namespace JSC::DFG
#endif // ENABLE(DFG_JIT)
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