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LibWasm: Implement memory.grow, memory.size and drop
These allow a very basic memory-using program to work.
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3 changed files with 39 additions and 4 deletions
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@ -297,7 +297,20 @@ public:
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auto& data() const { return m_data; }
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auto& data() { return m_data; }
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void grow(size_t new_size) { m_data.grow(new_size); }
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bool grow(size_t size_to_grow)
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{
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if (size_to_grow == 0)
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return true;
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auto new_size = m_data.size() + size_to_grow;
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if (m_type.limits().max().value_or(new_size) < new_size)
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return false;
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auto previous_size = m_size;
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m_data.grow(new_size);
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m_size = new_size;
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// The spec requires that we zero out everything on grow
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__builtin_memset(m_data.offset_pointer(previous_size), 0, size_to_grow);
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return true;
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}
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private:
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const MemoryType& m_type;
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