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Copy pathDFGArrayMode.cpp
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958 lines (837 loc) · 38 KB
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/*
* Copyright (C) 2012-2018 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 "ArrayPrototype.h"
#include "CacheableIdentifierInlines.h"
#include "DFGAbstractValue.h"
#include "DFGGraph.h"
#include "JSCInlines.h"
namespace JSC { namespace DFG {
ArrayMode ArrayMode::fromObserved(const ConcurrentJSLocker& locker, ArrayProfile* profile, Array::Action action, bool makeSafe)
{
Array::Class nonArray;
if (profile->usesOriginalArrayStructures(locker))
nonArray = Array::OriginalNonArray;
else
nonArray = Array::NonArray;
auto handleContiguousModes = [&] (Array::Type type, ArrayModes observed) {
Array::Class isArray;
Array::Conversion converts;
RELEASE_ASSERT((observed & (asArrayModesIgnoringTypedArrays(toIndexingShape(type)) | asArrayModesIgnoringTypedArrays(toIndexingShape(type) | ArrayClass) | asArrayModesIgnoringTypedArrays(toIndexingShape(type) | ArrayClass | CopyOnWrite))) == observed);
if (observed & asArrayModesIgnoringTypedArrays(toIndexingShape(type))) {
if ((observed & asArrayModesIgnoringTypedArrays(toIndexingShape(type))) == observed)
isArray = nonArray;
else
isArray = Array::PossiblyArray;
} else
isArray = Array::Array;
if (action == Array::Write && (observed & asArrayModesIgnoringTypedArrays(toIndexingShape(type) | ArrayClass | CopyOnWrite)))
converts = Array::Convert;
else
converts = Array::AsIs;
return ArrayMode(type, isArray, converts, action).withProfile(locker, profile, makeSafe);
};
ArrayModes observed = profile->observedArrayModes(locker);
switch (observed) {
case 0:
return ArrayMode(Array::Unprofiled);
case asArrayModesIgnoringTypedArrays(NonArray):
if (action == Array::Write && !profile->mayInterceptIndexedAccesses(locker))
return ArrayMode(Array::SelectUsingArguments, nonArray, Array::OutOfBounds, Array::Convert, action);
return ArrayMode(Array::SelectUsingPredictions, nonArray, action).withSpeculationFromProfile(locker, profile, makeSafe);
case asArrayModesIgnoringTypedArrays(ArrayWithUndecided):
if (action == Array::Write)
return ArrayMode(Array::SelectUsingArguments, Array::Array, Array::OutOfBounds, Array::Convert, action);
return ArrayMode(Array::Undecided, Array::Array, Array::OutOfBounds, Array::AsIs, action).withProfile(locker, profile, makeSafe);
case asArrayModesIgnoringTypedArrays(NonArray) | asArrayModesIgnoringTypedArrays(ArrayWithUndecided):
if (action == Array::Write && !profile->mayInterceptIndexedAccesses(locker))
return ArrayMode(Array::SelectUsingArguments, Array::PossiblyArray, Array::OutOfBounds, Array::Convert, action);
return ArrayMode(Array::SelectUsingPredictions, action).withSpeculationFromProfile(locker, profile, makeSafe);
case asArrayModesIgnoringTypedArrays(NonArrayWithInt32):
case asArrayModesIgnoringTypedArrays(ArrayWithInt32):
case asArrayModesIgnoringTypedArrays(CopyOnWriteArrayWithInt32):
case asArrayModesIgnoringTypedArrays(NonArrayWithInt32) | asArrayModesIgnoringTypedArrays(ArrayWithInt32):
case asArrayModesIgnoringTypedArrays(NonArrayWithInt32) | asArrayModesIgnoringTypedArrays(CopyOnWriteArrayWithInt32):
case asArrayModesIgnoringTypedArrays(ArrayWithInt32) | asArrayModesIgnoringTypedArrays(CopyOnWriteArrayWithInt32):
case asArrayModesIgnoringTypedArrays(NonArrayWithInt32) | asArrayModesIgnoringTypedArrays(ArrayWithInt32) | asArrayModesIgnoringTypedArrays(CopyOnWriteArrayWithInt32):
return handleContiguousModes(Array::Int32, observed);
case asArrayModesIgnoringTypedArrays(NonArrayWithDouble):
case asArrayModesIgnoringTypedArrays(ArrayWithDouble):
case asArrayModesIgnoringTypedArrays(CopyOnWriteArrayWithDouble):
case asArrayModesIgnoringTypedArrays(NonArrayWithDouble) | asArrayModesIgnoringTypedArrays(ArrayWithDouble):
case asArrayModesIgnoringTypedArrays(NonArrayWithDouble) | asArrayModesIgnoringTypedArrays(CopyOnWriteArrayWithDouble):
case asArrayModesIgnoringTypedArrays(ArrayWithDouble) | asArrayModesIgnoringTypedArrays(CopyOnWriteArrayWithDouble):
case asArrayModesIgnoringTypedArrays(NonArrayWithDouble) | asArrayModesIgnoringTypedArrays(ArrayWithDouble) | asArrayModesIgnoringTypedArrays(CopyOnWriteArrayWithDouble):
return handleContiguousModes(Array::Double, observed);
case asArrayModesIgnoringTypedArrays(NonArrayWithContiguous):
case asArrayModesIgnoringTypedArrays(ArrayWithContiguous):
case asArrayModesIgnoringTypedArrays(CopyOnWriteArrayWithContiguous):
case asArrayModesIgnoringTypedArrays(NonArrayWithContiguous) | asArrayModesIgnoringTypedArrays(ArrayWithContiguous):
case asArrayModesIgnoringTypedArrays(NonArrayWithContiguous) | asArrayModesIgnoringTypedArrays(CopyOnWriteArrayWithContiguous):
case asArrayModesIgnoringTypedArrays(ArrayWithContiguous) | asArrayModesIgnoringTypedArrays(CopyOnWriteArrayWithContiguous):
case asArrayModesIgnoringTypedArrays(NonArrayWithContiguous) | asArrayModesIgnoringTypedArrays(ArrayWithContiguous) | asArrayModesIgnoringTypedArrays(CopyOnWriteArrayWithContiguous):
return handleContiguousModes(Array::Contiguous, observed);
case asArrayModesIgnoringTypedArrays(NonArrayWithAlwaysSlowPutContiguous):
return handleContiguousModes(Array::AlwaysSlowPutContiguous, observed);
case asArrayModesIgnoringTypedArrays(NonArrayWithArrayStorage):
return ArrayMode(Array::ArrayStorage, nonArray, Array::AsIs, action).withProfile(locker, profile, makeSafe);
case asArrayModesIgnoringTypedArrays(NonArrayWithSlowPutArrayStorage):
case asArrayModesIgnoringTypedArrays(NonArrayWithArrayStorage) | asArrayModesIgnoringTypedArrays(NonArrayWithSlowPutArrayStorage):
return ArrayMode(Array::SlowPutArrayStorage, nonArray, Array::AsIs, action).withProfile(locker, profile, makeSafe);
case asArrayModesIgnoringTypedArrays(ArrayWithArrayStorage):
return ArrayMode(Array::ArrayStorage, Array::Array, Array::AsIs, action).withProfile(locker, profile, makeSafe);
case asArrayModesIgnoringTypedArrays(ArrayWithSlowPutArrayStorage):
case asArrayModesIgnoringTypedArrays(ArrayWithArrayStorage) | asArrayModesIgnoringTypedArrays(ArrayWithSlowPutArrayStorage):
return ArrayMode(Array::SlowPutArrayStorage, Array::Array, Array::AsIs, action).withProfile(locker, profile, makeSafe);
case asArrayModesIgnoringTypedArrays(NonArrayWithArrayStorage) | asArrayModesIgnoringTypedArrays(ArrayWithArrayStorage):
return ArrayMode(Array::ArrayStorage, Array::PossiblyArray, Array::AsIs, action).withProfile(locker, profile, makeSafe);
case asArrayModesIgnoringTypedArrays(NonArrayWithSlowPutArrayStorage) | asArrayModesIgnoringTypedArrays(ArrayWithSlowPutArrayStorage):
case asArrayModesIgnoringTypedArrays(NonArrayWithArrayStorage) | asArrayModesIgnoringTypedArrays(ArrayWithArrayStorage) | asArrayModesIgnoringTypedArrays(NonArrayWithSlowPutArrayStorage) | asArrayModesIgnoringTypedArrays(ArrayWithSlowPutArrayStorage):
return ArrayMode(Array::SlowPutArrayStorage, Array::PossiblyArray, Array::AsIs, action).withProfile(locker, profile, makeSafe);
case Int8ArrayMode:
return ArrayMode(Array::Int8Array, nonArray, Array::AsIs, action).withProfile(locker, profile, makeSafe);
case Int16ArrayMode:
return ArrayMode(Array::Int16Array, nonArray, Array::AsIs, action).withProfile(locker, profile, makeSafe);
case Int32ArrayMode:
return ArrayMode(Array::Int32Array, nonArray, Array::AsIs, action).withProfile(locker, profile, makeSafe);
case Uint8ArrayMode:
return ArrayMode(Array::Uint8Array, nonArray, Array::AsIs, action).withProfile(locker, profile, makeSafe);
case Uint8ClampedArrayMode:
return ArrayMode(Array::Uint8ClampedArray, nonArray, Array::AsIs, action).withProfile(locker, profile, makeSafe);
case Uint16ArrayMode:
return ArrayMode(Array::Uint16Array, nonArray, Array::AsIs, action).withProfile(locker, profile, makeSafe);
case Uint32ArrayMode:
return ArrayMode(Array::Uint32Array, nonArray, Array::AsIs, action).withProfile(locker, profile, makeSafe);
case Float32ArrayMode:
return ArrayMode(Array::Float32Array, nonArray, Array::AsIs, action).withProfile(locker, profile, makeSafe);
case Float64ArrayMode:
return ArrayMode(Array::Float64Array, nonArray, Array::AsIs, action).withProfile(locker, profile, makeSafe);
case BigInt64ArrayMode:
return ArrayMode(Array::BigInt64Array, nonArray, Array::AsIs, action).withProfile(locker, profile, makeSafe);
case BigUint64ArrayMode:
return ArrayMode(Array::BigUint64Array, nonArray, Array::AsIs, action).withProfile(locker, profile, makeSafe);
default:
// If we have seen multiple TypedArray types, or a TypedArray and non-typed array, it doesn't make sense to try to convert the object since you can't convert typed arrays.
if (observed & ALL_TYPED_ARRAY_MODES)
return ArrayMode(Array::Generic, nonArray, Array::AsIs, action).withProfile(locker, profile, makeSafe);
if ((observed & asArrayModesIgnoringTypedArrays(NonArray)) && profile->mayInterceptIndexedAccesses(locker))
return ArrayMode(Array::SelectUsingPredictions).withSpeculationFromProfile(locker, profile, makeSafe);
Array::Type type;
Array::Class arrayClass;
if (shouldUseSlowPutArrayStorage(observed))
type = Array::SlowPutArrayStorage;
else if (shouldUseFastArrayStorage(observed))
type = Array::ArrayStorage;
else if (shouldUseContiguous(observed))
type = Array::Contiguous;
else if (shouldUseDouble(observed))
type = Array::Double;
else if (shouldUseInt32(observed))
type = Array::Int32;
else if (shouldUseAlwaysSlowPutContiguous(observed))
type = Array::AlwaysSlowPutContiguous;
else
type = Array::SelectUsingArguments;
if (hasSeenArray(observed) && hasSeenNonArray(observed))
arrayClass = Array::PossiblyArray;
else if (hasSeenArray(observed))
arrayClass = Array::Array;
else if (hasSeenNonArray(observed))
arrayClass = nonArray;
else
arrayClass = Array::PossiblyArray;
return ArrayMode(type, arrayClass, Array::Convert, action).withProfile(locker, profile, makeSafe);
}
}
static bool canBecomeGetArrayLength(Graph& graph, Node* node)
{
if (node->op() == GetArrayLength)
return true;
if (node->op() != GetById)
return false;
auto uid = node->cacheableIdentifier().uid();
return uid == graph.m_vm.propertyNames->length.impl();
}
ArrayMode ArrayMode::refine(
Graph& graph, Node* node,
SpeculatedType base, SpeculatedType index, SpeculatedType value) const
{
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 ArrayMode(Array::ForceExit, action());
}
if (!isInt32Speculation(index) && !mayBeLargeTypedArray())
return ArrayMode(Array::Generic, action());
// If we had exited because of an exotic object behavior, then don't try to specialize.
if (graph.hasExitSite(node->origin.semantic, ExoticObjectMode))
return ArrayMode(Array::Generic, action());
// Note: our profiling currently doesn't give us good information in case we have
// an unlikely control flow path that sets the base to a non-cell value. Value
// profiling and prediction propagation will probably tell us that the value is
// either a cell or not, but that doesn't tell us which is more likely: that this
// is an array access on a cell (what we want and can optimize) or that the user is
// doing a crazy by-val access on a primitive (we can't easily optimize this and
// don't want to). So, for now, we assume that if the base is not a cell according
// to value profiling, but the array profile tells us something else, then we
// should just trust the array profile.
auto typedArrayResult = [&] (ArrayMode result) -> ArrayMode {
if (node->op() == PutByValDirect) {
// This is semantically identical to defineOwnProperty({configurable: true, writable:true, enumerable:true}),
// which we can't model as a simple store to the typed array since typed array indexed properties
// are non-configurable.
return ArrayMode(Array::Generic, action());
}
return result;
};
switch (type()) {
case Array::SelectUsingArguments:
if (!value)
return withType(Array::ForceExit);
if (isInt32Speculation(value))
return withTypeAndConversion(Array::Int32, Array::Convert);
if (isFullNumberSpeculation(value))
return withTypeAndConversion(Array::Double, Array::Convert);
return withTypeAndConversion(Array::Contiguous, Array::Convert);
case Array::Undecided: {
// As long as we have a JSArray getting its length shouldn't require any sane chainness.
if (canBecomeGetArrayLength(graph, node) && isJSArray())
return *this;
// If we have an OriginalArray and the JSArray prototype chain is sane,
// any indexed access always return undefined. We have a fast path for that.
JSGlobalObject* globalObject = graph.globalObjectFor(node->origin.semantic);
Structure* arrayPrototypeStructure = globalObject->arrayPrototype()->structure();
Structure* objectPrototypeStructure = globalObject->objectPrototype()->structure();
if (node->op() == GetByVal
&& isJSArrayWithOriginalStructure()
&& !graph.hasExitSite(node->origin.semantic, OutOfBounds)
&& arrayPrototypeStructure->transitionWatchpointSetIsStillValid()
&& objectPrototypeStructure->transitionWatchpointSetIsStillValid()
&& globalObject->arrayPrototypeChainIsSaneConcurrently(arrayPrototypeStructure, objectPrototypeStructure)) {
graph.registerAndWatchStructureTransition(arrayPrototypeStructure);
graph.registerAndWatchStructureTransition(objectPrototypeStructure);
if (globalObject->arrayPrototypeChainIsSaneConcurrently(arrayPrototypeStructure, objectPrototypeStructure))
return withSpeculation(Array::InBoundsSaneChain);
}
return ArrayMode(Array::Generic, action());
}
case Array::Int32:
if (!value || isInt32Speculation(value))
return *this;
if (isFullNumberSpeculation(value))
return withTypeAndConversion(Array::Double, Array::Convert);
return withTypeAndConversion(Array::Contiguous, Array::Convert);
case Array::Double:
if (!value || isFullNumberSpeculation(value))
return *this;
return withTypeAndConversion(Array::Contiguous, Array::Convert);
case Array::Contiguous:
return *this;
case Array::Int8Array:
case Array::Int16Array:
case Array::Int32Array:
case Array::Uint8Array:
case Array::Uint8ClampedArray:
case Array::Uint16Array:
case Array::Uint32Array:
case Array::Float32Array:
case Array::Float64Array:
case Array::BigInt64Array:
case Array::BigUint64Array:
// FIXME: no idea why we only preserve this out-of-bounds information for PutByVal and not GetByVal as well.
// https://bugs.webkit.org/show_bug.cgi?id=231276
if (node->op() == PutByVal) {
if (graph.hasExitSite(node->origin.semantic, OutOfBounds) || !isInBounds())
return typedArrayResult(withSpeculation(Array::OutOfBounds));
}
return typedArrayResult(withSpeculation(Array::InBounds));
case Array::Unprofiled:
case Array::SelectUsingPredictions: {
base &= ~SpecOther;
if (isStringSpeculation(base))
return withType(Array::String);
if (isDirectArgumentsSpeculation(base) || isScopedArgumentsSpeculation(base)) {
// Handle out-of-bounds accesses as generic accesses.
Array::Type type = isDirectArgumentsSpeculation(base) ? Array::DirectArguments : Array::ScopedArguments;
if (graph.hasExitSite(node->origin.semantic, OutOfBounds) || !isInBounds()) {
// FIXME: Support OOB access for ScopedArguments.
// https://bugs.webkit.org/show_bug.cgi?id=179596
if (type == Array::DirectArguments)
return ArrayMode(type, Array::NonArray, Array::OutOfBounds, Array::AsIs, action());
return ArrayMode(Array::Generic, action());
}
return withType(type);
}
ArrayMode result;
switch (node->op()) {
case PutByVal:
if (graph.hasExitSite(node->origin.semantic, OutOfBounds) || !isInBounds())
result = withSpeculation(Array::OutOfBounds);
else
result = withSpeculation(Array::InBounds);
break;
default:
result = withSpeculation(Array::InBounds);
break;
}
if (isInt8ArraySpeculation(base))
return typedArrayResult(result.withType(Array::Int8Array));
if (isInt16ArraySpeculation(base))
return typedArrayResult(result.withType(Array::Int16Array));
if (isInt32ArraySpeculation(base))
return typedArrayResult(result.withType(Array::Int32Array));
if (isUint8ArraySpeculation(base))
return typedArrayResult(result.withType(Array::Uint8Array));
if (isUint8ClampedArraySpeculation(base))
return typedArrayResult(result.withType(Array::Uint8ClampedArray));
if (isUint16ArraySpeculation(base))
return typedArrayResult(result.withType(Array::Uint16Array));
if (isUint32ArraySpeculation(base))
return typedArrayResult(result.withType(Array::Uint32Array));
if (isFloat32ArraySpeculation(base))
return typedArrayResult(result.withType(Array::Float32Array));
if (isFloat64ArraySpeculation(base))
return typedArrayResult(result.withType(Array::Float64Array));
if (isBigInt64ArraySpeculation(base))
return typedArrayResult(result.withType(Array::BigInt64Array));
if (isBigUint64ArraySpeculation(base))
return typedArrayResult(result.withType(Array::BigUint64Array));
if (type() == Array::Unprofiled)
return ArrayMode(Array::ForceExit, action());
return ArrayMode(Array::Generic, action());
}
default:
return *this;
}
}
StructureSet ArrayMode::originalArrayStructureSet(Graph& graph, const CodeOrigin& codeOrigin) const
{
JSGlobalObject* globalObject = graph.globalObjectFor(codeOrigin);
switch (arrayClass()) {
case Array::OriginalCopyOnWriteArray: {
if (conversion() == Array::AsIs) {
switch (type()) {
case Array::Int32:
return globalObject->originalArrayStructureForIndexingType(CopyOnWriteArrayWithInt32);
case Array::Double:
return globalObject->originalArrayStructureForIndexingType(CopyOnWriteArrayWithDouble);
case Array::Contiguous:
return globalObject->originalArrayStructureForIndexingType(CopyOnWriteArrayWithContiguous);
default:
CRASH();
return { };
}
}
FALLTHROUGH;
}
case Array::OriginalArray: {
switch (type()) {
case Array::Int32:
return globalObject->originalArrayStructureForIndexingType(ArrayWithInt32);
case Array::Double:
return globalObject->originalArrayStructureForIndexingType(ArrayWithDouble);
case Array::Contiguous:
return globalObject->originalArrayStructureForIndexingType(ArrayWithContiguous);
case Array::Undecided:
return globalObject->originalArrayStructureForIndexingType(ArrayWithUndecided);
case Array::ArrayStorage:
return globalObject->originalArrayStructureForIndexingType(ArrayWithArrayStorage);
default:
CRASH();
return { };
}
}
case Array::OriginalNonArray: {
TypedArrayType type = typedArrayType();
if (type == NotTypedArray) {
if (this->type() == Array::AlwaysSlowPutContiguous)
return globalObject->originalAlwaysSlowPutContiguousStructureSet();
return { };
}
return globalObject->typedArrayStructureConcurrently(type);
}
default:
return { };
}
}
StructureSet ArrayMode::originalArrayStructureSet(Graph& graph, Node* node) const
{
return originalArrayStructureSet(graph, node->origin.semantic);
}
bool ArrayMode::alreadyChecked(Graph& graph, Node* node, const AbstractValue& value, IndexingType shape) const
{
ASSERT(isSpecific());
IndexingType indexingModeMask = IsArray | IndexingShapeMask;
if (action() == Array::Write)
indexingModeMask |= CopyOnWrite;
switch (arrayClass()) {
case Array::Array: {
if (arrayModesAlreadyChecked(value.m_arrayModes, asArrayModesIgnoringTypedArrays(shape | IsArray)))
return true;
if (!value.m_structure.isFinite())
return false;
for (unsigned i = value.m_structure.size(); i--;) {
RegisteredStructure structure = value.m_structure[i];
if ((structure->indexingMode() & indexingModeMask) != (shape | IsArray))
return false;
}
return true;
}
// Array::OriginalNonArray can be shown when the value is a TypedArray with original structure.
// But here, we already filtered TypedArrays. So, just handle it like a NonArray.
case Array::OriginalNonArray: {
if (type() == Array::AlwaysSlowPutContiguous) {
if (!value.m_structure.isFinite())
return false;
JSGlobalObject* globalObject = graph.globalObjectFor(node->origin.semantic);
return value.m_structure.toStructureSet().isSubsetOf(globalObject->originalAlwaysSlowPutContiguousStructureSet());
}
FALLTHROUGH;
}
case Array::NonArray: {
if (arrayModesAlreadyChecked(value.m_arrayModes, asArrayModesIgnoringTypedArrays(shape)))
return true;
if (!value.m_structure.isFinite())
return false;
for (unsigned i = value.m_structure.size(); i--;) {
RegisteredStructure structure = value.m_structure[i];
if ((structure->indexingMode() & indexingModeMask) != shape)
return false;
}
return true;
}
case Array::PossiblyArray: {
if (arrayModesAlreadyChecked(value.m_arrayModes, asArrayModesIgnoringTypedArrays(shape) | asArrayModesIgnoringTypedArrays(shape | IsArray)))
return true;
if (!value.m_structure.isFinite())
return false;
for (unsigned i = value.m_structure.size(); i--;) {
RegisteredStructure structure = value.m_structure[i];
if ((structure->indexingMode() & (indexingModeMask & ~IsArray)) != shape)
return false;
}
return true;
}
// If ArrayMode is Array::OriginalCopyOnWriteArray or Array::OriginalArray, CheckArray is never emitted. Instead, we always emit CheckStructure.
// So, we should perform the same check to the CheckStructure here.
case Array::OriginalArray:
case Array::OriginalCopyOnWriteArray: {
if (!value.m_structure.isFinite())
return false;
return value.m_structure.toStructureSet().isSubsetOf(originalArrayStructureSet(graph, node));
}
}
return false;
}
bool ArrayMode::alreadyChecked(Graph& graph, Node* node, const AbstractValue& value) const
{
switch (type()) {
case Array::Generic:
return true;
case Array::ForceExit:
return false;
case Array::String:
return speculationChecked(value.m_type, SpecString);
case Array::Int32:
return alreadyChecked(graph, node, value, Int32Shape);
case Array::Double:
return alreadyChecked(graph, node, value, DoubleShape);
case Array::Contiguous:
return alreadyChecked(graph, node, value, ContiguousShape);
case Array::AlwaysSlowPutContiguous:
return alreadyChecked(graph, node, value, AlwaysSlowPutContiguousShape);
case Array::ArrayStorage:
return alreadyChecked(graph, node, value, ArrayStorageShape);
case Array::Undecided:
return alreadyChecked(graph, node, value, UndecidedShape);
case Array::SlowPutArrayStorage:
switch (arrayClass()) {
case Array::OriginalArray:
case Array::OriginalCopyOnWriteArray: {
CRASH();
return false;
}
case Array::Array: {
if (arrayModesAlreadyChecked(value.m_arrayModes, asArrayModesIgnoringTypedArrays(ArrayWithArrayStorage) | asArrayModesIgnoringTypedArrays(ArrayWithSlowPutArrayStorage)))
return true;
if (value.m_structure.isTop())
return false;
for (unsigned i = value.m_structure.size(); i--;) {
RegisteredStructure structure = value.m_structure[i];
if (!hasAnyArrayStorage(structure->indexingType()))
return false;
if (!(structure->indexingType() & IsArray))
return false;
}
return true;
}
// Array::OriginalNonArray can be shown when the value is a TypedArray with original structure.
// But here, we already filtered TypedArrays. So, just handle it like a NonArray.
case Array::NonArray:
case Array::OriginalNonArray: {
if (arrayModesAlreadyChecked(value.m_arrayModes, asArrayModesIgnoringTypedArrays(NonArrayWithArrayStorage) | asArrayModesIgnoringTypedArrays(NonArrayWithSlowPutArrayStorage)))
return true;
if (value.m_structure.isTop())
return false;
for (unsigned i = value.m_structure.size(); i--;) {
RegisteredStructure structure = value.m_structure[i];
if (!hasAnyArrayStorage(structure->indexingType()))
return false;
if (structure->indexingType() & IsArray)
return false;
}
return true;
}
case Array::PossiblyArray: {
if (arrayModesAlreadyChecked(value.m_arrayModes, asArrayModesIgnoringTypedArrays(NonArrayWithArrayStorage) | asArrayModesIgnoringTypedArrays(ArrayWithArrayStorage) | asArrayModesIgnoringTypedArrays(NonArrayWithSlowPutArrayStorage) | asArrayModesIgnoringTypedArrays(ArrayWithSlowPutArrayStorage)))
return true;
if (value.m_structure.isTop())
return false;
for (unsigned i = value.m_structure.size(); i--;) {
RegisteredStructure structure = value.m_structure[i];
if (!hasAnyArrayStorage(structure->indexingType()))
return false;
}
return true;
}
default:
CRASH();
}
case Array::DirectArguments:
return speculationChecked(value.m_type, SpecDirectArguments);
case Array::ScopedArguments:
return speculationChecked(value.m_type, SpecScopedArguments);
case Array::Int8Array:
return speculationChecked(value.m_type, SpecInt8Array);
case Array::Int16Array:
return speculationChecked(value.m_type, SpecInt16Array);
case Array::Int32Array:
return speculationChecked(value.m_type, SpecInt32Array);
case Array::Uint8Array:
return speculationChecked(value.m_type, SpecUint8Array);
case Array::Uint8ClampedArray:
return speculationChecked(value.m_type, SpecUint8ClampedArray);
case Array::Uint16Array:
return speculationChecked(value.m_type, SpecUint16Array);
case Array::Uint32Array:
return speculationChecked(value.m_type, SpecUint32Array);
case Array::Float32Array:
return speculationChecked(value.m_type, SpecFloat32Array);
case Array::Float64Array:
return speculationChecked(value.m_type, SpecFloat64Array);
case Array::BigInt64Array:
return speculationChecked(value.m_type, SpecBigInt64Array);
case Array::BigUint64Array:
return speculationChecked(value.m_type, SpecBigUint64Array);
case Array::AnyTypedArray:
return speculationChecked(value.m_type, SpecTypedArrayView);
case Array::SelectUsingPredictions:
case Array::Unprofiled:
case Array::SelectUsingArguments:
break;
}
CRASH();
return false;
}
const char* arrayActionToString(Array::Action action)
{
switch (action) {
case Array::Read:
return "Read";
case Array::Write:
return "Write";
default:
return "Unknown!";
}
}
const char* arrayTypeToString(Array::Type type)
{
switch (type) {
case Array::SelectUsingPredictions:
return "SelectUsingPredictions";
case Array::SelectUsingArguments:
return "SelectUsingArguments";
case Array::Unprofiled:
return "Unprofiled";
case Array::Generic:
return "Generic";
case Array::ForceExit:
return "ForceExit";
case Array::String:
return "String";
case Array::Undecided:
return "Undecided";
case Array::Int32:
return "Int32";
case Array::Double:
return "Double";
case Array::Contiguous:
return "Contiguous";
case Array::AlwaysSlowPutContiguous:
return "AlwaysSlowPutContiguous";
case Array::ArrayStorage:
return "ArrayStorage";
case Array::SlowPutArrayStorage:
return "SlowPutArrayStorage";
case Array::DirectArguments:
return "DirectArguments";
case Array::ScopedArguments:
return "ScopedArguments";
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";
case Array::BigInt64Array:
return "BigInt64Array";
case Array::BigUint64Array:
return "BigUint64Array";
case Array::AnyTypedArray:
return "AnyTypedArray";
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!";
}
}
const char* arrayClassToString(Array::Class arrayClass)
{
switch (arrayClass) {
case Array::Array:
return "Array";
case Array::OriginalArray:
return "OriginalArray";
case Array::OriginalCopyOnWriteArray:
return "OriginalCopyOnWriteArray";
case Array::NonArray:
return "NonArray";
case Array::OriginalNonArray:
return "OriginalNonArray";
case Array::PossiblyArray:
return "PossiblyArray";
default:
return "Unknown!";
}
}
const char* arraySpeculationToString(Array::Speculation speculation)
{
switch (speculation) {
case Array::InBoundsSaneChain:
return "InBoundsSaneChain";
case Array::InBounds:
return "InBounds";
case Array::ToHole:
return "ToHole";
case Array::OutOfBounds:
return "OutOfBounds";
case Array::OutOfBoundsSaneChain:
return "OutOfBoundsSaneChain";
default:
return "Unknown!";
}
}
const char* arrayConversionToString(Array::Conversion conversion)
{
switch (conversion) {
case Array::AsIs:
return "AsIs";
case Array::Convert:
return "Convert";
default:
return "Unknown!";
}
}
IndexingType toIndexingShape(Array::Type type)
{
switch (type) {
case Array::Int32:
return Int32Shape;
case Array::Double:
return DoubleShape;
case Array::Contiguous:
return ContiguousShape;
case Array::AlwaysSlowPutContiguous:
return AlwaysSlowPutContiguousShape;
case Array::Undecided:
return UndecidedShape;
case Array::ArrayStorage:
return ArrayStorageShape;
case Array::SlowPutArrayStorage:
return SlowPutArrayStorageShape;
default:
return NoIndexingShape;
}
}
TypedArrayType toTypedArrayType(Array::Type type)
{
switch (type) {
case Array::Int8Array:
return TypeInt8;
case Array::Int16Array:
return TypeInt16;
case Array::Int32Array:
return TypeInt32;
case Array::Uint8Array:
return TypeUint8;
case Array::Uint8ClampedArray:
return TypeUint8Clamped;
case Array::Uint16Array:
return TypeUint16;
case Array::Uint32Array:
return TypeUint32;
case Array::Float32Array:
return TypeFloat32;
case Array::Float64Array:
return TypeFloat64;
case Array::BigInt64Array:
return TypeBigInt64;
case Array::BigUint64Array:
return TypeBigUint64;
case Array::AnyTypedArray:
RELEASE_ASSERT_NOT_REACHED();
return NotTypedArray;
default:
return NotTypedArray;
}
}
Array::Type toArrayType(TypedArrayType type)
{
switch (type) {
case TypeInt8:
return Array::Int8Array;
case TypeInt16:
return Array::Int16Array;
case TypeInt32:
return Array::Int32Array;
case TypeUint8:
return Array::Uint8Array;
case TypeUint8Clamped:
return Array::Uint8ClampedArray;
case TypeUint16:
return Array::Uint16Array;
case TypeUint32:
return Array::Uint32Array;
case TypeFloat32:
return Array::Float32Array;
case TypeFloat64:
return Array::Float64Array;
case TypeBigInt64:
return Array::BigInt64Array;
case TypeBigUint64:
return Array::BigUint64Array;
default:
return Array::Generic;
}
}
Array::Type refineTypedArrayType(Array::Type oldType, TypedArrayType newType)
{
if (oldType == Array::Generic)
return oldType;
Array::Type newArrayType = toArrayType(newType);
if (newArrayType == Array::Generic)
return newArrayType;
if (oldType != newArrayType)
return Array::AnyTypedArray;
return oldType;
}
bool permitsBoundsCheckLowering(Array::Type type)
{
switch (type) {
case Array::Int32:
case Array::Double:
case Array::Contiguous:
case Array::AlwaysSlowPutContiguous:
case Array::ArrayStorage:
case Array::SlowPutArrayStorage:
case Array::Int8Array:
case Array::Int16Array:
case Array::Int32Array:
case Array::Uint8Array:
case Array::Uint8ClampedArray:
case Array::Uint16Array:
case Array::Uint32Array:
case Array::Float32Array:
case Array::Float64Array:
case Array::BigInt64Array:
case Array::BigUint64Array:
case Array::AnyTypedArray:
return true;
default:
// These don't allow for bounds check lowering either because the bounds
// check isn't a speculation (like String, sort of) or because the type implies an impure access.
return false;
}
}
bool ArrayMode::permitsBoundsCheckLowering() const
{
return DFG::permitsBoundsCheckLowering(type()) && isInBounds();
}
void ArrayMode::dump(PrintStream& out) const
{
out.print(type(), "+", arrayClass(), "+", speculation(), "+", conversion(), "+", action());
}
} } // namespace JSC::DFG
namespace WTF {
void printInternal(PrintStream& out, JSC::DFG::Array::Action action)
{
out.print(JSC::DFG::arrayActionToString(action));
}
void printInternal(PrintStream& out, JSC::DFG::Array::Type type)
{
out.print(JSC::DFG::arrayTypeToString(type));
}
void printInternal(PrintStream& out, JSC::DFG::Array::Class arrayClass)
{
out.print(JSC::DFG::arrayClassToString(arrayClass));
}
void printInternal(PrintStream& out, JSC::DFG::Array::Speculation speculation)
{
out.print(JSC::DFG::arraySpeculationToString(speculation));
}
void printInternal(PrintStream& out, JSC::DFG::Array::Conversion conversion)
{
out.print(JSC::DFG::arrayConversionToString(conversion));
}
} // namespace WTF
#endif // ENABLE(DFG_JIT)