7fec66dd1c
These aren't actually an extra set, without them the fold operation would be syntactically invalid. Also remove possible cast of float->double/double->float in Value::to()
441 lines
12 KiB
C++
441 lines
12 KiB
C++
/*
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* Copyright (c) 2021, Ali Mohammad Pur <mpfard@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/OwnPtr.h>
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#include <AK/Result.h>
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#include <LibWasm/Types.h>
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namespace Wasm {
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struct InstantiationError {
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String error { "Unknown error" };
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};
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using InstantiationResult = Result<void, InstantiationError>;
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TYPEDEF_DISTINCT_NUMERIC_GENERAL(u64, true, true, false, false, false, true, FunctionAddress);
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TYPEDEF_DISTINCT_NUMERIC_GENERAL(u64, true, true, false, false, false, true, ExternAddress);
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TYPEDEF_DISTINCT_NUMERIC_GENERAL(u64, true, true, false, false, false, true, TableAddress);
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TYPEDEF_DISTINCT_NUMERIC_GENERAL(u64, true, true, false, false, false, true, GlobalAddress);
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TYPEDEF_DISTINCT_NUMERIC_GENERAL(u64, true, true, false, false, false, true, MemoryAddress);
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// FIXME: These should probably be made generic/virtual if/when we decide to do something more
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// fancy than just a dumb interpreter.
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class Value {
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public:
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using AnyValueType = Variant<i32, i64, float, double, FunctionAddress, ExternAddress>;
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explicit Value(AnyValueType value)
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: m_value(move(value))
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, m_type(ValueType::I32)
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{
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if (m_value.has<i32>())
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m_type = ValueType { ValueType::I32 };
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else if (m_value.has<i64>())
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m_type = ValueType { ValueType::I64 };
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else if (m_value.has<float>())
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m_type = ValueType { ValueType::F32 };
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else if (m_value.has<double>())
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m_type = ValueType { ValueType::F64 };
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else if (m_value.has<FunctionAddress>())
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m_type = ValueType { ValueType::FunctionReference };
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else if (m_value.has<ExternAddress>())
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m_type = ValueType { ValueType::ExternReference };
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else
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VERIFY_NOT_REACHED();
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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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: m_value(0)
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, m_type(type)
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{
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switch (type.kind()) {
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case ValueType::Kind::ExternReference:
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m_value = ExternAddress { bit_cast<u64>(raw_value) };
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break;
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case ValueType::Kind::FunctionReference:
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m_value = FunctionAddress { bit_cast<u64>(raw_value) };
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break;
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case ValueType::Kind::I32:
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m_value = static_cast<i32>(bit_cast<i64>(raw_value));
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break;
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case ValueType::Kind::I64:
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m_value = static_cast<i64>(bit_cast<u64>(raw_value));
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break;
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case ValueType::Kind::F32:
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m_value = static_cast<float>(bit_cast<double>(raw_value));
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break;
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case ValueType::Kind::F64:
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m_value = bit_cast<double>(raw_value);
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break;
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default:
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VERIFY_NOT_REACHED();
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}
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}
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Value(const Value& value)
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: m_value(AnyValueType { value.m_value })
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, m_type(value.m_type)
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{
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}
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Value(Value&& value)
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: m_value(move(value.m_value))
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, m_type(move(value.m_type))
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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, decltype(value)>)
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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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private:
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AnyValueType m_value;
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ValueType m_type;
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};
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struct Trap {
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// Empty value type
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};
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class Result {
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public:
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explicit Result(Vector<Value> values)
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: m_values(move(values))
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{
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}
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Result(Trap)
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: m_is_trap(true)
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{
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}
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auto& values() const { return m_values; }
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auto& values() { return m_values; }
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auto is_trap() const { return m_is_trap; }
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private:
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Vector<Value> m_values;
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bool m_is_trap { false };
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};
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using ExternValue = Variant<FunctionAddress, TableAddress, MemoryAddress, GlobalAddress>;
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class ExportInstance {
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public:
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explicit ExportInstance(String name, ExternValue value)
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: m_name(move(name))
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, m_value(move(value))
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{
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}
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auto& name() const { return m_name; }
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auto& value() const { return m_value; }
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private:
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String m_name;
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ExternValue m_value;
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};
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class ModuleInstance {
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public:
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explicit ModuleInstance(
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Vector<FunctionType> types, Vector<FunctionAddress> function_addresses, Vector<TableAddress> table_addresses,
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Vector<MemoryAddress> memory_addresses, Vector<GlobalAddress> global_addresses, Vector<ExportInstance> exports)
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: m_types(move(types))
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, m_functions(move(function_addresses))
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, m_tables(move(table_addresses))
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, m_memories(move(memory_addresses))
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, m_globals(move(global_addresses))
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, m_exports(move(exports))
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{
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}
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ModuleInstance() = default;
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auto& types() const { return m_types; }
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auto& functions() const { return m_functions; }
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auto& tables() const { return m_tables; }
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auto& memories() const { return m_memories; }
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auto& globals() const { return m_globals; }
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auto& exports() const { return m_exports; }
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auto& types() { return m_types; }
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auto& functions() { return m_functions; }
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auto& tables() { return m_tables; }
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auto& memories() { return m_memories; }
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auto& globals() { return m_globals; }
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auto& exports() { return m_exports; }
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private:
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Vector<FunctionType> m_types;
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Vector<FunctionAddress> m_functions;
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Vector<TableAddress> m_tables;
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Vector<MemoryAddress> m_memories;
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Vector<GlobalAddress> m_globals;
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Vector<ExportInstance> m_exports;
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};
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class WasmFunction {
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public:
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explicit WasmFunction(const FunctionType& type, const ModuleInstance& module, const Module::Function& code)
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: m_type(type)
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, m_module(module)
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, m_code(code)
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{
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}
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auto& type() const { return m_type; }
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auto& module() const { return m_module; }
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auto& code() const { return m_code; }
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private:
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const FunctionType& m_type;
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const ModuleInstance& m_module;
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const Module::Function& m_code;
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};
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class HostFunction {
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public:
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explicit HostFunction(FlatPtr ptr, const FunctionType& type)
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: m_ptr(ptr)
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, m_type(type)
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{
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}
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auto ptr() const { return m_ptr; }
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auto& type() const { return m_type; }
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private:
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FlatPtr m_ptr { 0 };
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const FunctionType& m_type;
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};
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using FunctionInstance = Variant<WasmFunction, HostFunction>;
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class Reference {
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public:
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struct Null {
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ValueType type;
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};
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struct Func {
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FunctionAddress address;
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};
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struct Extern {
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ExternAddress address;
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};
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using RefType = Variant<Null, Func, Extern>;
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explicit Reference(RefType ref)
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: m_ref(move(ref))
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{
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}
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auto& ref() const { return m_ref; }
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private:
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RefType m_ref;
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};
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class TableInstance {
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public:
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explicit TableInstance(const TableType& type, Vector<Optional<Reference>> elements)
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: m_elements(move(elements))
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, m_type(type)
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{
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}
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auto& elements() const { return m_elements; }
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auto& elements() { return m_elements; }
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auto& type() const { return m_type; }
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private:
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Vector<Optional<Reference>> m_elements;
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const TableType& m_type;
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};
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class MemoryInstance {
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public:
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explicit MemoryInstance(const MemoryType& type)
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: m_type(type)
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{
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grow(m_type.limits().min());
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}
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auto& type() const { return m_type; }
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auto size() const { return m_size; }
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auto& data() const { return m_data; }
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auto& data() { return m_data; }
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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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size_t m_size { 0 };
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ByteBuffer m_data;
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};
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class GlobalInstance {
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public:
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explicit GlobalInstance(Value value, bool is_mutable)
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: m_mutable(is_mutable)
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, m_value(move(value))
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{
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}
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auto is_mutable() const { return m_mutable; }
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auto& value() const { return m_value; }
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void set_value(Value value)
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{
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VERIFY(is_mutable());
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m_value = move(value);
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}
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private:
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bool m_mutable { false };
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Value m_value;
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};
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class Store {
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public:
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Store() = default;
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Optional<FunctionAddress> allocate(ModuleInstance& module, const Module::Function& function);
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Optional<FunctionAddress> allocate(const HostFunction&);
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Optional<TableAddress> allocate(const TableType&);
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Optional<MemoryAddress> allocate(const MemoryType&);
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Optional<GlobalAddress> allocate(const GlobalType&, Value);
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FunctionInstance* get(FunctionAddress);
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TableInstance* get(TableAddress);
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MemoryInstance* get(MemoryAddress);
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GlobalInstance* get(GlobalAddress);
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private:
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Vector<FunctionInstance> m_functions;
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Vector<TableInstance> m_tables;
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Vector<MemoryInstance> m_memories;
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Vector<GlobalInstance> m_globals;
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};
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class Label {
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public:
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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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class Frame {
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AK_MAKE_NONCOPYABLE(Frame);
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public:
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explicit Frame(const ModuleInstance& module, Vector<Value> locals, const Expression& expression, size_t arity)
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: m_module(module)
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, m_locals(move(locals))
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, m_expression(expression)
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, m_arity(arity)
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{
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}
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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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private:
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const ModuleInstance& m_module;
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Vector<Value> m_locals;
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const Expression& m_expression;
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size_t m_arity { 0 };
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};
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class Stack {
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public:
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using EntryType = Variant<NonnullOwnPtr<Value>, NonnullOwnPtr<Label>, NonnullOwnPtr<Frame>>;
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Stack() = default;
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[[nodiscard]] bool is_empty() const { return m_data.is_empty(); }
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void push(EntryType entry) { m_data.append(move(entry)); }
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auto pop() { return m_data.take_last(); }
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auto& peek() const { return m_data.last(); }
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auto size() const { return m_data.size(); }
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auto& entries() const { return m_data; }
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private:
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Vector<EntryType> m_data;
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};
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class AbstractMachine {
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public:
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explicit AbstractMachine() = default;
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// Load and instantiate a module, and link it into this interpreter.
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InstantiationResult instantiate(const Module&, Vector<ExternValue>);
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Result invoke(FunctionAddress, Vector<Value>);
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auto& module_instance() const { return m_module_instance; }
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auto& module_instance() { return m_module_instance; }
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auto& store() const { return m_store; }
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auto& store() { return m_store; }
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private:
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InstantiationResult allocate_all(const Module&, Vector<ExternValue>&, Vector<Value>& global_values);
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ModuleInstance m_module_instance;
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Store m_store;
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};
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}
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