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[turbofan] Add support for updating feedback via CheckBounds

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Add support for disallowing speculation upon deoptimize from
a CheckBound node, and use this in the case of array builtins
in js-call-reducer to prevent deoptimization loops.

Bug: v8:7127
Change-Id: I04cf655b10178d2938d2f0ee6b336601fab6463b
Reviewed-on: https://chromium-review.googlesource.com/822195
Commit-Queue: Sigurd Schneider <sigurds@chromium.org>
Reviewed-by: Benedikt Meurer <bmeurer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#50097}
This commit is contained in:
Sigurd Schneider 2017-12-14 08:40:31 +01:00 committed by Commit Bot
parent 09a5289904
commit 9d3e0774c9
10 changed files with 192 additions and 36 deletions
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4
src/compiler/effect-control-linearizer.cc
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@ -1312,9 +1312,11 @@ Node* EffectControlLinearizer::LowerTruncateTaggedToFloat64(Node* node) {
Node* EffectControlLinearizer::LowerCheckBounds(Node* node, Node* frame_state) {
Node* index = node->InputAt(0);
Node* limit = node->InputAt(1);
const CheckParameters& params = CheckParametersOf(node->op());
Node* check = __ Uint32LessThan(index, limit);
__ DeoptimizeIfNot(DeoptimizeReason::kOutOfBounds, check, frame_state);
__ DeoptimizeIfNot(DeoptimizeReason::kOutOfBounds, check, frame_state,
params.feedback());
return index;
}

19
src/compiler/js-call-reducer.cc
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@ -902,7 +902,8 @@ Reduction JSCallReducer::ReduceArrayForEach(Handle<JSFunction> function,
receiver_maps, p.feedback()),
receiver, effect, control);
Node* element = SafeLoadElement(kind, receiver, control, &effect, &k);
Node* element =
SafeLoadElement(kind, receiver, control, &effect, &k, p.feedback());
Node* next_k =
graph()->NewNode(simplified()->NumberAdd(), k, jsgraph()->Constant(1));
@ -1109,7 +1110,8 @@ Reduction JSCallReducer::ReduceArrayMap(Handle<JSFunction> function,
receiver_maps, p.feedback()),
receiver, effect, control);
Node* element = SafeLoadElement(kind, receiver, control, &effect, &k);
Node* element =
SafeLoadElement(kind, receiver, control, &effect, &k, p.feedback());
Node* next_k =
graph()->NewNode(simplified()->NumberAdd(), k, jsgraph()->OneConstant());
@ -1311,7 +1313,8 @@ Reduction JSCallReducer::ReduceArrayFilter(Handle<JSFunction> function,
receiver_maps, p.feedback()),
receiver, effect, control);
Node* element = SafeLoadElement(kind, receiver, control, &effect, &k);
Node* element =
SafeLoadElement(kind, receiver, control, &effect, &k, p.feedback());
Node* next_k =
graph()->NewNode(simplified()->NumberAdd(), k, jsgraph()->OneConstant());
@ -1497,7 +1500,8 @@ Reduction JSCallReducer::ReduceArrayFind(Handle<JSFunction> function,
}
// Load k-th element from receiver.
Node* element = SafeLoadElement(kind, receiver, control, &effect, &k);
Node* element =
SafeLoadElement(kind, receiver, control, &effect, &k, p.feedback());
// Increment k for the next iteration.
Node* next_k = checkpoint_params[3] =
@ -1675,14 +1679,15 @@ void JSCallReducer::RewirePostCallbackExceptionEdges(Node* check_throw,
}
Node* JSCallReducer::SafeLoadElement(ElementsKind kind, Node* receiver,
Node* control, Node** effect, Node** k) {
Node* control, Node** effect, Node** k,
const VectorSlotPair& feedback) {
// Make sure that the access is still in bounds, since the callback could have
// changed the array's size.
Node* length = *effect = graph()->NewNode(
simplified()->LoadField(AccessBuilder::ForJSArrayLength(kind)), receiver,
*effect, control);
*k = *effect = graph()->NewNode(simplified()->CheckBounds(), *k, length,
*effect, control);
*k = *effect = graph()->NewNode(simplified()->CheckBounds(feedback), *k,
length, *effect, control);
// Reload the elements pointer before calling the callback, since the previous
// callback might have resized the array causing the elements buffer to be

3
src/compiler/js-call-reducer.h
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@ -110,7 +110,8 @@ class JSCallReducer final : public AdvancedReducer {
// Load receiver[k], first bounding k by receiver array length.
// k is thusly changed, and the effect is changed as well.
Node* SafeLoadElement(ElementsKind kind, Node* receiver, Node* control,
Node** effect, Node** k);
Node** effect, Node** k,
const VectorSlotPair& feedback);
Graph* graph() const;
JSGraph* jsgraph() const { return jsgraph_; }

2
src/compiler/js-create-lowering.cc
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@ -525,7 +525,7 @@ Reduction JSCreateLowering::ReduceNewArray(Node* node, Node* length,
// This has to be kept in sync with src/runtime/runtime-array.cc,
// where this limit is protected.
length = effect = graph()->NewNode(
simplified()->CheckBounds(), length,
simplified()->CheckBounds(VectorSlotPair()), length,
jsgraph()->Constant(JSArray::kInitialMaxFastElementArray), effect,
control);

38
src/compiler/js-native-context-specialization.cc
View File

@ -2126,13 +2126,14 @@ JSNativeContextSpecialization::BuildElementAccess(
// Check that the {index} is a valid array index, we do the actual
// bounds check below and just skip the store below if it's out of
// bounds for the {receiver}.
index = effect = graph()->NewNode(simplified()->CheckBounds(), index,
jsgraph()->Constant(Smi::kMaxValue),
effect, control);
index = effect = graph()->NewNode(
simplified()->CheckBounds(VectorSlotPair()), index,
jsgraph()->Constant(Smi::kMaxValue), effect, control);
} else {
// Check that the {index} is in the valid range for the {receiver}.
index = effect = graph()->NewNode(simplified()->CheckBounds(), index,
length, effect, control);
index = effect =
graph()->NewNode(simplified()->CheckBounds(VectorSlotPair()), index,
length, effect, control);
}
// Access the actual element.
@ -2272,13 +2273,14 @@ JSNativeContextSpecialization::BuildElementAccess(
// Check that the {index} is a valid array index, we do the actual
// bounds check below and just skip the store below if it's out of
// bounds for the {receiver}.
index = effect = graph()->NewNode(simplified()->CheckBounds(), index,
jsgraph()->Constant(Smi::kMaxValue),
effect, control);
index = effect = graph()->NewNode(
simplified()->CheckBounds(VectorSlotPair()), index,
jsgraph()->Constant(Smi::kMaxValue), effect, control);
} else {
// Check that the {index} is in the valid range for the {receiver}.
index = effect = graph()->NewNode(simplified()->CheckBounds(), index,
length, effect, control);
index = effect =
graph()->NewNode(simplified()->CheckBounds(VectorSlotPair()), index,
length, effect, control);
}
// Compute the element access.
@ -2430,8 +2432,9 @@ JSNativeContextSpecialization::BuildElementAccess(
jsgraph()->Constant(JSObject::kMaxGap))
: graph()->NewNode(simplified()->NumberAdd(), length,
jsgraph()->OneConstant());
index = effect = graph()->NewNode(simplified()->CheckBounds(), index,
limit, effect, control);
index = effect =
graph()->NewNode(simplified()->CheckBounds(VectorSlotPair()), index,
limit, effect, control);
// Grow {elements} backing store if necessary.
GrowFastElementsMode mode =
@ -2492,9 +2495,9 @@ Node* JSNativeContextSpecialization::BuildIndexedStringLoad(
dependencies()->AssumePropertyCell(factory()->no_elements_protector());
// Ensure that the {index} is a valid String length.
index = *effect = graph()->NewNode(simplified()->CheckBounds(), index,
jsgraph()->Constant(String::kMaxLength),
*effect, *control);
index = *effect = graph()->NewNode(
simplified()->CheckBounds(VectorSlotPair()), index,
jsgraph()->Constant(String::kMaxLength), *effect, *control);
// Load the single character string from {receiver} or yield
// undefined if the {index} is not within the valid bounds.
@ -2515,8 +2518,9 @@ Node* JSNativeContextSpecialization::BuildIndexedStringLoad(
vtrue, vfalse, *control);
} else {
// Ensure that {index} is less than {receiver} length.
index = *effect = graph()->NewNode(simplified()->CheckBounds(), index,
length, *effect, *control);
index = *effect =
graph()->NewNode(simplified()->CheckBounds(VectorSlotPair()), index,
length, *effect, *control);
// Return the character from the {receiver} as single character string.
return graph()->NewNode(simplified()->StringCharAt(), receiver, index,

6
src/compiler/js-typed-lowering.cc
View File

@ -666,9 +666,9 @@ Reduction JSTypedLowering::ReduceCreateConsString(Node* node) {
// has the additional benefit of not holding on to the lazy {frame_state}
// and thus potentially reduces the number of live ranges and allows for
// more truncations.
length = effect = graph()->NewNode(simplified()->CheckBounds(), length,
jsgraph()->Constant(String::kMaxLength),
effect, control);
length = effect = graph()->NewNode(
simplified()->CheckBounds(VectorSlotPair()), length,
jsgraph()->Constant(String::kMaxLength), effect, control);
} else {
// Check if we would overflow the allowed maximum string length.
Node* check =

3
src/compiler/redundancy-elimination.cc
View File

@ -129,6 +129,9 @@ bool IsCompatibleCheck(Node const* a, Node const* b) {
if (a->opcode() == IrOpcode::kCheckInternalizedString &&
b->opcode() == IrOpcode::kCheckString) {
// CheckInternalizedString(node) implies CheckString(node)
} else if (a->opcode() == IrOpcode::kCheckBounds &&
b->opcode() == IrOpcode::kCheckBounds) {
// CheckBounds are compatible independent of associated feedback.
} else {
return false;
}

46
src/compiler/simplified-operator.cc
View File

@ -128,6 +128,21 @@ ConvertReceiverMode ConvertReceiverModeOf(Operator const* op) {
return OpParameter<ConvertReceiverMode>(op);
}
bool operator==(CheckParameters const& lhs, CheckParameters const& rhs) {
return lhs.feedback() == rhs.feedback();
}
size_t hash_value(CheckParameters const& p) { return hash_value(p.feedback()); }
std::ostream& operator<<(std::ostream& os, CheckParameters const& p) {
return os << p.feedback();
}
CheckParameters const& CheckParametersOf(Operator const* op) {
CHECK_EQ(IrOpcode::kCheckBounds, op->opcode());
return OpParameter<CheckParameters>(op);
}
size_t hash_value(CheckFloat64HoleMode mode) {
return static_cast<size_t>(mode);
}
@ -648,7 +663,6 @@ DeoptimizeReason DeoptimizeReasonOf(const Operator* op) {
V(SpeculativeNumberLessThanOrEqual)
#define CHECKED_OP_LIST(V) \
V(CheckBounds, 2, 1) \
V(CheckHeapObject, 1, 1) \
V(CheckInternalizedString, 1, 1) \
V(CheckNumber, 1, 1) \
@ -673,6 +687,8 @@ DeoptimizeReason DeoptimizeReasonOf(const Operator* op) {
V(CheckedTaggedToTaggedSigned, 1, 1) \
V(CheckedTaggedToTaggedPointer, 1, 1)
#define CHECKED_WITH_FEEDBACK_OP_LIST(V) V(CheckBounds, 2, 1)
struct SimplifiedOperatorGlobalCache final {
#define PURE(Name, properties, value_input_count, control_input_count) \
struct Name##Operator final : public Operator { \
@ -695,6 +711,18 @@ struct SimplifiedOperatorGlobalCache final {
CHECKED_OP_LIST(CHECKED)
#undef CHECKED
#define CHECKED_WITH_FEEDBACK(Name, value_input_count, value_output_count) \
struct Name##Operator final : public Operator1<CheckParameters> { \
Name##Operator() \
: Operator1<CheckParameters>( \
IrOpcode::k##Name, Operator::kFoldable | Operator::kNoThrow, \
#Name, value_input_count, 1, 1, value_output_count, 1, 0, \
CheckParameters(VectorSlotPair())) {} \
}; \
Name##Operator k##Name;
CHECKED_WITH_FEEDBACK_OP_LIST(CHECKED_WITH_FEEDBACK)
#undef CHECKED_WITH_FEEDBACK
template <DeoptimizeReason kDeoptimizeReason>
struct CheckIfOperator final : public Operator1<DeoptimizeReason> {
CheckIfOperator()
@ -940,6 +968,21 @@ GET_FROM_CACHE(FindOrderedHashMapEntryForInt32Key)
GET_FROM_CACHE(LoadFieldByIndex)
#undef GET_FROM_CACHE
#define GET_FROM_CACHE_WITH_FEEDBACK(Name, value_input_count, \
value_output_count) \
const Operator* SimplifiedOperatorBuilder::Name( \
const VectorSlotPair& feedback) { \
if (!feedback.IsValid()) { \
return &cache_.k##Name; \
} \
return new (zone()) Operator1<CheckParameters>( \
IrOpcode::k##Name, Operator::kFoldable | Operator::kNoThrow, #Name, \
value_input_count, 1, 1, value_output_count, 1, 0, \
CheckParameters(feedback)); \
}
CHECKED_WITH_FEEDBACK_OP_LIST(GET_FROM_CACHE_WITH_FEEDBACK)
#undef GET_FROM_CACHE_WITH_FEEDBACK
const Operator* SimplifiedOperatorBuilder::RuntimeAbort(BailoutReason reason) {
return new (zone()) Operator1<BailoutReason>( // --
IrOpcode::kRuntimeAbort, // opcode
@ -1299,6 +1342,7 @@ const Operator* SimplifiedOperatorBuilder::TransitionAndStoreNonNumberElement(
#undef PURE_OP_LIST
#undef SPECULATIVE_NUMBER_BINOP_LIST
#undef CHECKED_WITH_FEEDBACK_OP_LIST
#undef CHECKED_OP_LIST
#undef ACCESS_OP_LIST

24
src/compiler/simplified-operator.h
View File

@ -92,6 +92,28 @@ ExternalArrayType ExternalArrayTypeOf(const Operator* op) WARN_UNUSED_RESULT;
// The ConvertReceiverMode is used as parameter by ConvertReceiver operators.
ConvertReceiverMode ConvertReceiverModeOf(Operator const* op);
// A the parameters for several Check nodes. The {feedback} parameter is
// optional. If {feedback} references a valid CallIC slot and this MapCheck
// fails, then speculation on that CallIC slot will be disabled.
class CheckParameters final {
public:
explicit CheckParameters(const VectorSlotPair& feedback)
: feedback_(feedback) {}
VectorSlotPair const& feedback() const { return feedback_; }
private:
VectorSlotPair feedback_;
};
bool operator==(CheckParameters const&, CheckParameters const&);
size_t hash_value(CheckParameters const&);
std::ostream& operator<<(std::ostream&, CheckParameters const&);
CheckParameters const& CheckParametersOf(Operator const*) WARN_UNUSED_RESULT;
enum class CheckFloat64HoleMode : uint8_t {
kNeverReturnHole, // Never return the hole (deoptimize instead).
kAllowReturnHole // Allow to return the hole (signaling NaN).
@ -443,7 +465,7 @@ class V8_EXPORT_PRIVATE SimplifiedOperatorBuilder final
const Operator* TruncateTaggedPointerToBit();
const Operator* CheckIf(DeoptimizeReason deoptimize_reason);
const Operator* CheckBounds();
const Operator* CheckBounds(const VectorSlotPair& feedback);
const Operator* CheckMaps(CheckMapsFlags, ZoneHandleSet<Map>,
const VectorSlotPair& = VectorSlotPair());
const Operator* CompareMaps(ZoneHandleSet<Map>);

83
test/mjsunit/compiler/deopt-array-builtins.js
View File

@ -4,7 +4,9 @@
// Flags: --allow-natives-syntax --opt
(function testForEach() {
/* Test MapCheck behavior */
(function testForEachMapCheck() {
function f(v,n,o) {
Object.freeze(o);
}
@ -21,7 +23,7 @@
})();
(function testFind() {
(function testFindMapCheck() {
function f(v,n,o) {
Object.freeze(o);
return false;
@ -38,7 +40,7 @@
assertOptimized(g);
})();
(function testMap() {
(function testMapMapCheck() {
function f(v,n,o) {
Object.freeze(o);
return false;
@ -55,7 +57,7 @@
assertOptimized(g);
})();
(function testFilter() {
(function testFilterMapCheck() {
function f(v,n,o) {
Object.freeze(o);
return true;
@ -71,3 +73,76 @@
g();
assertOptimized(g);
})();
/* Test CheckBounds behavior */
(function testForEachCheckBounds() {
function f(v,n,o) {
o.length=2;
}
function g() {
[1,2,3].forEach(f);
}
g();
g();
%OptimizeFunctionOnNextCall(g);
g();
%OptimizeFunctionOnNextCall(g);
g();
assertOptimized(g);
})();
(function testFindCheckBounds() {
function f(v,n,o) {
o.length=2;
return false;
}
function g() {
[1,2,3].find(f);
}
g();
g();
%OptimizeFunctionOnNextCall(g);
g();
%OptimizeFunctionOnNextCall(g);
g();
assertOptimized(g);
})();
(function testMapCheckBounds() {
function f(v,n,o) {
o.length=2;
return false;
}
function g() {
[1,2,3].map(f);
}
g();
g();
%OptimizeFunctionOnNextCall(g);
g();
%OptimizeFunctionOnNextCall(g);
g();
assertOptimized(g);
})();
(function testFilterCheckBounds() {
function f(v,n,o) {
o.length = 2;
return true;
}
function g() {
[1,2,3].filter(f);
}
g();
g();
%OptimizeFunctionOnNextCall(g);
g();
g();
%OptimizeFunctionOnNextCall(g);
g();
g();
assertOptimized(g);
})();