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https://github.com/RGBCube/serenity
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LibWasm: Start implementing a naive bytecode interpreter
As the parser now flattens out the instructions and inserts synthetic nesting/structured instructions where needed, we can treat the whole thing as a simple parsed bytecode stream. This currently knows how to execute the following instructions: - unreachable - nop - local.get - local.set - {i,f}{32,64}.const - block - loop - if/else - branch / branch_if - i32_add - i32_and/or/xor - i32_ne This also extends the 'wasm' utility to optionally execute the first function in the module with optionally user-supplied arguments.
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10 changed files with 513 additions and 30 deletions
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@ -49,7 +49,7 @@ public:
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}
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template<typename T>
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requires(sizeof(T) <= sizeof(u64)) explicit Value(ValueType type, T raw_value)
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requires(sizeof(T) == sizeof(u64)) explicit Value(ValueType type, T raw_value)
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: m_value(0)
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, m_type(type)
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{
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@ -89,6 +89,33 @@ public:
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{
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}
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Value& operator=(Value&& value)
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{
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m_value = move(value.m_value);
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m_type = move(value.m_type);
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return *this;
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}
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template<typename T>
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Optional<T> to()
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{
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Optional<T> result;
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m_value.visit(
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[&](auto value) {
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if constexpr (!IsSame<T, FunctionAddress> && !IsSame<T, ExternAddress>)
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result = value;
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},
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[&](const FunctionAddress& address) {
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if constexpr (IsSame<T, FunctionAddress>)
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result = address;
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},
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[&](const ExternAddress& address) {
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if constexpr (IsSame<T, ExternAddress>)
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result = address;
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});
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return result;
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}
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auto& type() const { return m_type; }
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auto& value() const { return m_value; }
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@ -317,14 +344,17 @@ private:
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class Label {
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public:
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explicit Label(InstructionPointer continuation)
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: m_continuation(continuation)
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explicit Label(size_t arity, InstructionPointer continuation)
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: m_arity(arity)
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, m_continuation(continuation)
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{
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}
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auto continuation() const { return m_continuation; }
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auto arity() const { return m_arity; }
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private:
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size_t m_arity { 0 };
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InstructionPointer m_continuation;
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};
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@ -342,6 +372,7 @@ public:
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auto& module() const { return m_module; }
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auto& locals() const { return m_locals; }
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auto& locals() { return m_locals; }
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auto& expression() const { return m_expression; }
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auto arity() const { return m_arity; }
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