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https://github.com/LadybirdBrowser/ladybird.git
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6b50f23242
Imported functions in Wasm may throw JS exceptions, and we need to preserve these exceptions so we can pass them to the calling JS code. This also adds a `assert_wasm_result()` API to Result for cases where only Wasm traps or values are expected (e.g. internal uses) to avoid making LibWasm (pointlessly) handle JS exceptions that will never show up in reality.
88 lines
3 KiB
C++
88 lines
3 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/StackInfo.h>
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#include <LibWasm/AbstractMachine/Configuration.h>
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#include <LibWasm/AbstractMachine/Interpreter.h>
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namespace Wasm {
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struct BytecodeInterpreter : public Interpreter {
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virtual void interpret(Configuration&) override;
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virtual ~BytecodeInterpreter() override = default;
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virtual bool did_trap() const override { return !m_trap.has<Empty>(); }
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virtual DeprecatedString trap_reason() const override
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{
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return m_trap.visit(
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[](Empty) -> DeprecatedString { VERIFY_NOT_REACHED(); },
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[](Trap const& trap) { return trap.reason; },
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[](JS::Completion const& completion) { return completion.value()->to_string_without_side_effects().release_value().to_deprecated_string(); });
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}
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virtual void clear_trap() override { m_trap = Empty {}; }
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struct CallFrameHandle {
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explicit CallFrameHandle(BytecodeInterpreter& interpreter, Configuration& configuration)
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: m_configuration_handle(configuration)
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, m_interpreter(interpreter)
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{
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}
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~CallFrameHandle() = default;
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Configuration::CallFrameHandle m_configuration_handle;
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BytecodeInterpreter& m_interpreter;
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};
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protected:
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virtual void interpret(Configuration&, InstructionPointer&, Instruction const&);
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void branch_to_label(Configuration&, LabelIndex);
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template<typename ReadT, typename PushT>
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void load_and_push(Configuration&, Instruction const&);
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template<typename PopT, typename StoreT>
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void pop_and_store(Configuration&, Instruction const&);
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void store_to_memory(Configuration&, Instruction const&, ReadonlyBytes data, i32 base);
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void call_address(Configuration&, FunctionAddress);
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template<typename PopType, typename PushType, typename Operator>
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void binary_numeric_operation(Configuration&);
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template<typename PopType, typename PushType, typename Operator>
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void unary_operation(Configuration&);
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template<typename V, typename T>
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MakeUnsigned<T> checked_unsigned_truncate(V);
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template<typename V, typename T>
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MakeSigned<T> checked_signed_truncate(V);
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template<typename T>
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T read_value(ReadonlyBytes data);
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Vector<Value> pop_values(Configuration& configuration, size_t count);
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ALWAYS_INLINE bool trap_if_not(bool value, StringView reason)
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{
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if (!value)
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m_trap = Trap { reason };
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return !m_trap.has<Empty>();
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}
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Variant<Trap, JS::Completion, Empty> m_trap;
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StackInfo m_stack_info;
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};
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struct DebuggerBytecodeInterpreter : public BytecodeInterpreter {
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virtual ~DebuggerBytecodeInterpreter() override = default;
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Function<bool(Configuration&, InstructionPointer&, Instruction const&)> pre_interpret_hook;
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Function<bool(Configuration&, InstructionPointer&, Instruction const&, Interpreter const&)> post_interpret_hook;
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private:
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virtual void interpret(Configuration&, InstructionPointer&, Instruction const&) override;
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};
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}
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