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// Copyright 2019 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "src/compiler/map-inference.h"
#include "src/compiler/compilation-dependencies.h"
#include "src/compiler/feedback-source.h"
#include "src/compiler/js-graph.h"
#include "src/compiler/simplified-operator.h"
#include "src/objects/map-inl.h"
namespace v8 {
namespace internal {
namespace compiler {
MapInference::MapInference(JSHeapBroker* broker, Node* object, Effect effect)
: broker_(broker), object_(object) {
auto result =
NodeProperties::InferMapsUnsafe(broker_, object_, effect, &maps_);
maps_state_ = (result == NodeProperties::kUnreliableMaps)
? kUnreliableDontNeedGuard
: kReliableOrGuarded;
DCHECK_EQ(maps_.is_empty(), result == NodeProperties::kNoMaps);
}
MapInference::~MapInference() { CHECK(Safe()); }
bool MapInference::Safe() const { return maps_state_ != kUnreliableNeedGuard; }
void MapInference::SetNeedGuardIfUnreliable() {
CHECK(HaveMaps());
if (maps_state_ == kUnreliableDontNeedGuard) {
maps_state_ = kUnreliableNeedGuard;
}
}
void MapInference::SetGuarded() { maps_state_ = kReliableOrGuarded; }
bool MapInference::HaveMaps() const { return !maps_.is_empty(); }
bool MapInference::AllOfInstanceTypesAreJSReceiver() const {
return AllOfInstanceTypesUnsafe(
static_cast<bool (*)(InstanceType)>(&InstanceTypeChecker::IsJSReceiver));
}
bool MapInference::AllOfInstanceTypesAre(InstanceType type) const {
CHECK(!InstanceTypeChecker::IsString(type));
return AllOfInstanceTypesUnsafe(
[type](InstanceType other) { return type == other; });
}
bool MapInference::AnyOfInstanceTypesAre(InstanceType type) const {
CHECK(!InstanceTypeChecker::IsString(type));
return AnyOfInstanceTypesUnsafe(
[type](InstanceType other) { return type == other; });
}
bool MapInference::AllOfInstanceTypes(std::function<bool(InstanceType)> f) {
SetNeedGuardIfUnreliable();
return AllOfInstanceTypesUnsafe(f);
}
bool MapInference::AllOfInstanceTypesUnsafe(
std::function<bool(InstanceType)> f) const {
CHECK(HaveMaps());
auto instance_type = [f](MapRef map) { return f(map.instance_type()); };
return std::all_of(maps_.begin(), maps_.end(), instance_type);
}
bool MapInference::AnyOfInstanceTypesUnsafe(
std::function<bool(InstanceType)> f) const {
CHECK(HaveMaps());
auto instance_type = [f](MapRef map) { return f(map.instance_type()); };
return std::any_of(maps_.begin(), maps_.end(), instance_type);
}
ZoneRefSet<Map> const& MapInference::GetMaps() {
SetNeedGuardIfUnreliable();
return maps_;
}
bool MapInference::Is(MapRef expected_map) {
if (!HaveMaps()) return false;
if (maps_.size() != 1) return false;
return maps_.at(0).equals(expected_map);
}
void MapInference::InsertMapChecks(JSGraph* jsgraph, Effect* effect,
Control control,
const FeedbackSource& feedback) {
CHECK(HaveMaps());
CHECK(feedback.IsValid());
*effect = jsgraph->graph()->NewNode(
jsgraph->simplified()->CheckMaps(CheckMapsFlag::kNone, maps_, feedback),
object_, *effect, control);
SetGuarded();
}
bool MapInference::RelyOnMapsViaStability(
CompilationDependencies* dependencies) {
CHECK(HaveMaps());
return RelyOnMapsHelper(dependencies, nullptr, nullptr, Control{nullptr}, {});
}
bool MapInference::RelyOnMapsPreferStability(
CompilationDependencies* dependencies, JSGraph* jsgraph, Effect* effect,
Control control, const FeedbackSource& feedback) {
CHECK(HaveMaps());
if (Safe()) return false;
if (RelyOnMapsViaStability(dependencies)) return true;
CHECK(RelyOnMapsHelper(nullptr, jsgraph, effect, control, feedback));
return false;
}
bool MapInference::RelyOnMapsHelper(CompilationDependencies* dependencies,
JSGraph* jsgraph, Effect* effect,
Control control,
const FeedbackSource& feedback) {
if (Safe()) return true;
auto is_stable = [](MapRef map) { return map.is_stable(); };
if (dependencies != nullptr &&
std::all_of(maps_.begin(), maps_.end(), is_stable)) {
for (MapRef map : maps_) {
dependencies->DependOnStableMap(map);
}
SetGuarded();
return true;
} else if (feedback.IsValid()) {
InsertMapChecks(jsgraph, effect, control, feedback);
return true;
} else {
return false;
}
}
Reduction MapInference::NoChange() {
SetGuarded();
maps_.clear(); // Just to make some CHECKs fail if {this} gets used after.
return Reducer::NoChange();
}
} // namespace compiler
} // namespace internal
} // namespace v8
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