3c74dc9f4d
This patch adds two macros to declare per-type allocators: - JS_DECLARE_ALLOCATOR(TypeName) - JS_DEFINE_ALLOCATOR(TypeName) When used, they add a type-specific CellAllocator that the Heap will delegate allocation requests to. The result of this is that GC objects of the same type always end up within the same HeapBlock, drastically reducing the ability to perform type confusion attacks. It also improves HeapBlock utilization, since each block now has cells sized exactly to the type used within that block. (Previously we only had a handful of block sizes available, and most GC allocations ended up with a large amount of slack in their tails.) There is a small performance hit from this, but I'm sure we can make up for it elsewhere. Note that the old size-based allocators still exist, and we fall back to them for any type that doesn't have its own CellAllocator.
76 lines
3.2 KiB
C++
76 lines
3.2 KiB
C++
/*
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* Copyright (c) 2022, David Tuin <davidot@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <LibJS/Runtime/AbstractOperations.h>
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#include <LibJS/Runtime/Array.h>
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#include <LibJS/Runtime/ErrorConstructor.h>
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#include <LibJS/Runtime/GlobalObject.h>
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#include <LibJS/Runtime/Iterator.h>
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#include <LibJS/Runtime/SuppressedError.h>
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#include <LibJS/Runtime/SuppressedErrorConstructor.h>
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namespace JS {
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JS_DEFINE_ALLOCATOR(SuppressedErrorConstructor);
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SuppressedErrorConstructor::SuppressedErrorConstructor(Realm& realm)
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: NativeFunction(static_cast<Object&>(realm.intrinsics().error_constructor()))
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{
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}
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void SuppressedErrorConstructor::initialize(Realm& realm)
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{
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auto& vm = this->vm();
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Base::initialize(realm);
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// 10.1.4.2.1 SuppressedError.prototype, https://tc39.es/proposal-explicit-resource-management/#sec-suppressederror.prototype
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define_direct_property(vm.names.prototype, realm.intrinsics().suppressed_error_prototype(), 0);
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define_direct_property(vm.names.length, Value(3), Attribute::Configurable);
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}
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// 10.1.4.1.1 SuppressedError ( error, suppressed, message [ , options ] ), https://tc39.es/proposal-explicit-resource-management/#sec-suppressederror
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ThrowCompletionOr<Value> SuppressedErrorConstructor::call()
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{
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// 1. If NewTarget is undefined, let newTarget be the active function object; else let newTarget be NewTarget.
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return TRY(construct(*this));
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}
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// 10.1.4.1.1 SuppressedError ( error, suppressed, message [ , options ] ), https://tc39.es/proposal-explicit-resource-management/#sec-suppressederror
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ThrowCompletionOr<NonnullGCPtr<Object>> SuppressedErrorConstructor::construct(FunctionObject& new_target)
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{
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auto& vm = this->vm();
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auto error = vm.argument(0);
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auto suppressed = vm.argument(1);
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auto message = vm.argument(2);
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auto options = vm.argument(3);
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// 2. Let O be ? OrdinaryCreateFromConstructor(newTarget, "%SuppressedError.prototype%", « [[ErrorData]] »).
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auto suppressed_error = TRY(ordinary_create_from_constructor<SuppressedError>(vm, new_target, &Intrinsics::suppressed_error_prototype));
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// 3. If message is not undefined, then
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if (!message.is_undefined()) {
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// a. Let msg be ? ToString(message).
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auto msg = TRY(message.to_string(vm));
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// b. Perform CreateNonEnumerableDataPropertyOrThrow(O, "message", msg).
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suppressed_error->create_non_enumerable_data_property_or_throw(vm.names.message, PrimitiveString::create(vm, move(msg)));
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}
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// 4. Perform ? InstallErrorCause(O, options).
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TRY(suppressed_error->install_error_cause(options));
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// 5. Perform ! DefinePropertyOrThrow(O, "error", PropertyDescriptor { [[Configurable]]: true, [[Enumerable]]: false, [[Writable]]: true, [[Value]]: error }).
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MUST(suppressed_error->define_property_or_throw(vm.names.error, { .value = error, .writable = true, .enumerable = false, .configurable = true }));
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// 6. Perform ! DefinePropertyOrThrow(O, "suppressed", PropertyDescriptor { [[Configurable]]: true, [[Enumerable]]: false, [[Writable]]: true, [[Value]]: suppressed }).
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MUST(suppressed_error->define_property_or_throw(vm.names.suppressed, { .value = suppressed, .writable = true, .enumerable = false, .configurable = true }));
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// 7. Return O.
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return suppressed_error;
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}
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}
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