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// Copyright (c) 2012, the Dart project authors. Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.
#include "vm/bootstrap_natives.h"
#include "vm/compiler/jit/compiler.h"
#include "vm/dart_entry.h"
#include "vm/exceptions.h"
#include "vm/native_entry.h"
#include "vm/object.h"
#include "vm/symbols.h"
namespace dart {
DEFINE_NATIVE_ENTRY(Function_apply, 0, 2) {
const int kTypeArgsLen = 0; // TODO(regis): Add support for generic function.
const Array& fun_arguments =
Array::CheckedHandle(zone, arguments->NativeArgAt(0));
const Array& fun_arg_names =
Array::CheckedHandle(zone, arguments->NativeArgAt(1));
const Array& fun_args_desc = Array::Handle(
zone, ArgumentsDescriptor::NewBoxed(kTypeArgsLen, fun_arguments.Length(),
fun_arg_names));
const Object& result = Object::Handle(
zone, DartEntry::InvokeClosure(thread, fun_arguments, fun_args_desc));
if (result.IsError()) {
Exceptions::PropagateError(Error::Cast(result));
}
return result.ptr();
}
static bool ClosureEqualsHelper(Zone* zone,
const Closure& receiver,
const Object& other) {
if (receiver.ptr() == other.ptr()) {
return true;
}
if (!other.IsClosure()) {
return false;
}
const auto& other_closure = Closure::Cast(other);
const auto& func_a = Function::Handle(zone, receiver.function());
const auto& func_b = Function::Handle(zone, other_closure.function());
// Check that functions match.
if (func_a.ptr() != func_b.ptr()) {
// Non-implicit closures taken from different functions are not equal.
if (!func_a.IsImplicitClosureFunction() ||
!func_b.IsImplicitClosureFunction()) {
return false;
}
// If the closure functions are not the same, check the function's name and
// owner, as multiple function objects could exist for the same function due
// to hot reload.
if ((func_a.name() != func_b.name() || func_a.Owner() != func_b.Owner() ||
func_a.is_static() != func_b.is_static())) {
return false;
}
}
// Check that the delayed type argument vectors match.
if (receiver.delayed_type_arguments() !=
other_closure.delayed_type_arguments()) {
// Mismatches should only happen when a generic function is involved.
ASSERT(func_a.IsGeneric() || func_b.IsGeneric());
const auto& type_args_a =
TypeArguments::Handle(zone, receiver.delayed_type_arguments());
const auto& type_args_b =
TypeArguments::Handle(zone, other_closure.delayed_type_arguments());
if (type_args_a.IsNull() || type_args_b.IsNull() ||
(type_args_a.Length() != type_args_b.Length()) ||
!type_args_a.IsEquivalent(type_args_b, TypeEquality::kSyntactical)) {
return false;
}
}
if (func_a.IsImplicitClosureFunction()) {
ASSERT(func_b.IsImplicitClosureFunction());
if (!func_a.is_static()) {
ASSERT(!func_b.is_static());
// Check that the both receiver instances are the same.
const Instance& receiver_a =
Instance::Handle(zone, receiver.GetImplicitClosureReceiver());
const Instance& receiver_b =
Instance::Handle(zone, other_closure.GetImplicitClosureReceiver());
return receiver_a.ptr() == receiver_b.ptr();
}
} else {
ASSERT(!func_b.IsImplicitClosureFunction());
if (func_a.IsGeneric()) {
// Additional constraints for closures of generic functions:
// (1) Different instantiations of the same generic closure
// with the same type arguments should be equal.
// This means that instantiated generic closures are not unique
// and equality of instantiated generic closures should not be
// based on identity.
// (2) Instantiations of non-equal generic closures should be non-equal.
// This means that equality of non-instantiated generic closures
// should not be based on identity too as it won't match equality
// after instantiation.
if ((receiver.GetContext() != other_closure.GetContext()) ||
(receiver.instantiator_type_arguments() !=
other_closure.instantiator_type_arguments()) ||
(receiver.function_type_arguments() !=
other_closure.function_type_arguments())) {
return false;
}
} else {
// Closures of non-generic functions are unique.
return false;
}
}
return true;
}
DEFINE_NATIVE_ENTRY(Closure_equals, 0, 2) {
const Closure& receiver =
Closure::CheckedHandle(zone, arguments->NativeArgAt(0));
GET_NATIVE_ARGUMENT(Instance, other, arguments->NativeArgAt(1));
ASSERT(!other.IsNull());
return Bool::Get(ClosureEqualsHelper(zone, receiver, other)).ptr();
}
DEFINE_NATIVE_ENTRY(Closure_computeHash, 0, 1) {
const Closure& receiver =
Closure::CheckedHandle(zone, arguments->NativeArgAt(0));
return Smi::New(receiver.ComputeHash());
}
} // namespace dart