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LibJS: Make basic block size customizable
And keep the default 4 KiB for the code generator.
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@ -11,18 +11,18 @@
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namespace JS::Bytecode {
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NonnullOwnPtr<BasicBlock> BasicBlock::create(String name)
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NonnullOwnPtr<BasicBlock> BasicBlock::create(String name, size_t size)
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{
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return adopt_own(*new BasicBlock(move(name)));
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return adopt_own(*new BasicBlock(move(name), max(size, static_cast<size_t>(4 * KiB))));
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}
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BasicBlock::BasicBlock(String name)
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BasicBlock::BasicBlock(String name, size_t size)
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: m_name(move(name))
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{
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// FIXME: This is not the smartest solution ever. Find something cleverer!
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// The main issue we're working around here is that we don't want pointers into the bytecode stream to become invalidated
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// during code generation due to dynamic buffer resizing. Otherwise we could just use a Vector.
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m_buffer_capacity = 4 * KiB;
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m_buffer_capacity = size;
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m_buffer = (u8*)mmap(nullptr, m_buffer_capacity, PROT_READ | PROT_WRITE, MAP_ANONYMOUS | MAP_PRIVATE, 0, 0);
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VERIFY(m_buffer != MAP_FAILED);
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}
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@ -47,13 +47,14 @@ class BasicBlock {
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AK_MAKE_NONCOPYABLE(BasicBlock);
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public:
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static NonnullOwnPtr<BasicBlock> create(String name);
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static NonnullOwnPtr<BasicBlock> create(String name, size_t size = 4 * KiB);
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~BasicBlock();
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void seal();
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void dump(Executable const&) const;
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ReadonlyBytes instruction_stream() const { return ReadonlyBytes { m_buffer, m_buffer_size }; }
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size_t size() const { return m_buffer_size; }
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void* next_slot() { return m_buffer + m_buffer_size; }
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bool can_grow(size_t additional_size) const { return m_buffer_size + additional_size <= m_buffer_capacity; }
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@ -65,7 +66,7 @@ public:
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String const& name() const { return m_name; }
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private:
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BasicBlock(String name);
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BasicBlock(String name, size_t size);
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u8* m_buffer { nullptr };
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size_t m_buffer_capacity { 0 };
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