mirror of
https://github.com/LadybirdBrowser/ladybird.git
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7002c47ce1
The additional data being passed will be used in an upcoming commit. Allows splitting the churn of modified function signatures from the logically meaningful code change. No behavior change.
68 lines
1.8 KiB
C++
68 lines
1.8 KiB
C++
/*
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* Copyright (c) 2026, the Ladybird developers.
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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/Noncopyable.h>
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#include <AK/Platform.h>
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#include <AK/Span.h>
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#include <AK/Types.h>
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#include <LibJS/Runtime/ExecutionContext.h>
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namespace JS {
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class InterpreterStack {
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AK_MAKE_NONCOPYABLE(InterpreterStack);
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AK_MAKE_NONMOVABLE(InterpreterStack);
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public:
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static constexpr size_t stack_size = 8 * MiB;
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InterpreterStack();
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~InterpreterStack();
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[[nodiscard]] ALWAYS_INLINE void* top() const { return m_top; }
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[[nodiscard]] ALWAYS_INLINE ExecutionContext* allocate(u32 registers_and_locals_count, ReadonlySpan<Value> constants, u32 arguments_count)
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{
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auto tail_count = registers_and_locals_count + constants.size() + arguments_count;
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auto size = sizeof(ExecutionContext) + tail_count * sizeof(Value);
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// Align up to alignof(ExecutionContext).
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size = (size + alignof(ExecutionContext) - 1) & ~(alignof(ExecutionContext) - 1);
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auto* new_top = static_cast<u8*>(m_top) + size;
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if (new_top > m_limit) [[unlikely]]
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return nullptr;
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auto* result = new (m_top) ExecutionContext(registers_and_locals_count, constants, arguments_count);
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m_top = new_top;
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return result;
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}
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ALWAYS_INLINE void deallocate(void* mark)
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{
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VERIFY(mark >= m_base && mark <= m_top);
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m_top = mark;
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}
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[[nodiscard]] ALWAYS_INLINE bool is_exhausted() const
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{
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return m_top >= m_limit;
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}
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[[nodiscard]] ALWAYS_INLINE size_t size_remaining() const
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{
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return static_cast<u8*>(m_limit) - static_cast<u8*>(m_top);
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}
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private:
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void* m_base { nullptr };
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void* m_top { nullptr };
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void* m_limit { nullptr };
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};
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}
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