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.
90 lines
6.3 KiB
C++
90 lines
6.3 KiB
C++
/*
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* Copyright (c) 2021-2022, Linus Groh <linusg@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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#include <AK/Forward.h>
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#include <LibJS/Forward.h>
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#include <LibJS/Runtime/AbstractOperations.h>
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namespace JS {
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// 27.2.1.1 PromiseCapability Records, https://tc39.es/ecma262/#sec-promisecapability-records
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class PromiseCapability final : public Cell {
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JS_CELL(PromiseCapability, Cell);
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JS_DECLARE_ALLOCATOR(PromiseCapability);
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public:
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static NonnullGCPtr<PromiseCapability> create(VM& vm, NonnullGCPtr<Object> promise, NonnullGCPtr<FunctionObject> resolve, NonnullGCPtr<FunctionObject> reject);
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virtual ~PromiseCapability() = default;
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[[nodiscard]] NonnullGCPtr<Object> promise() const { return m_promise; }
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[[nodiscard]] NonnullGCPtr<FunctionObject> resolve() const { return m_resolve; }
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[[nodiscard]] NonnullGCPtr<FunctionObject> reject() const { return m_reject; }
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private:
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PromiseCapability(NonnullGCPtr<Object>, NonnullGCPtr<FunctionObject>, NonnullGCPtr<FunctionObject>);
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virtual void visit_edges(Visitor&) override;
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NonnullGCPtr<Object> m_promise;
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NonnullGCPtr<FunctionObject> m_resolve;
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NonnullGCPtr<FunctionObject> m_reject;
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};
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// 27.2.1.1.1 IfAbruptRejectPromise ( value, capability ), https://tc39.es/ecma262/#sec-ifabruptrejectpromise
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#define __TRY_OR_REJECT(vm, capability, expression, CALL_CHECK) \
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({ \
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auto&& _temporary_try_or_reject_result = (expression); \
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/* 1. If value is an abrupt completion, then */ \
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if (_temporary_try_or_reject_result.is_error()) { \
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/* a. Perform ? Call(capability.[[Reject]], undefined, « value.[[Value]] »). */ \
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CALL_CHECK(JS::call(vm, *(capability)->reject(), js_undefined(), *_temporary_try_or_reject_result.release_error().value())); \
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\
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/* b. Return capability.[[Promise]]. */ \
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return (capability)->promise(); \
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} \
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\
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static_assert(!::AK::Detail::IsLvalueReference<decltype(_temporary_try_or_reject_result.release_value())>, \
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"Do not return a reference from a fallible expression"); \
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\
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/* 2. Else if value is a Completion Record, set value to value.[[Value]]. */ \
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_temporary_try_or_reject_result.release_value(); \
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})
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#define TRY_OR_REJECT(vm, capability, expression) \
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__TRY_OR_REJECT(vm, capability, expression, TRY)
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#define TRY_OR_MUST_REJECT(vm, capability, expression) \
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__TRY_OR_REJECT(vm, capability, expression, MUST)
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// 27.2.1.1.1 IfAbruptRejectPromise ( value, capability ), https://tc39.es/ecma262/#sec-ifabruptrejectpromise
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#define TRY_OR_REJECT_WITH_VALUE(vm, capability, expression) \
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({ \
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auto&& _temporary_try_or_reject_result = (expression); \
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/* 1. If value is an abrupt completion, then */ \
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if (_temporary_try_or_reject_result.is_error()) { \
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/* a. Perform ? Call(capability.[[Reject]], undefined, « value.[[Value]] »). */ \
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TRY(JS::call(vm, *(capability)->reject(), js_undefined(), *_temporary_try_or_reject_result.release_error().value())); \
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\
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/* b. Return capability.[[Promise]]. */ \
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return Value { (capability)->promise() }; \
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} \
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\
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static_assert(!::AK::Detail::IsLvalueReference<decltype(_temporary_try_or_reject_result.release_value())>, \
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"Do not return a reference from a fallible expression"); \
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\
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/* 2. Else if value is a Completion Record, set value to value.[[Value]]. */ \
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_temporary_try_or_reject_result.release_value(); \
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})
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// 27.2.1.5 NewPromiseCapability ( C ), https://tc39.es/ecma262/#sec-newpromisecapability
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ThrowCompletionOr<NonnullGCPtr<PromiseCapability>> new_promise_capability(VM& vm, Value constructor);
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}
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