4d9246ac9d
This adds very basic support for module instantiation/allocation, as well as a stub for an interpreter (and executions APIs). The 'wasm' utility is further expanded to instantiate, and attempt executing the first non-imported function in the module. Note that as the execution is a stub, the expected result is a zero. Regardless, this will allow future commits to implement the JS WebAssembly API. :^)
77 lines
2.3 KiB
C++
77 lines
2.3 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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#include <LibWasm/AbstractMachine/Configuration.h>
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#include <LibWasm/AbstractMachine/Interpreter.h>
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namespace Wasm {
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Optional<Label> Configuration::nth_label(size_t i)
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{
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for (auto& entry : m_stack.entries()) {
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if (auto ptr = entry.get_pointer<NonnullOwnPtr<Label>>()) {
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if (i == 0)
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return **ptr;
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--i;
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}
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}
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return {};
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}
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Result Configuration::call(FunctionAddress address, Vector<Value> arguments)
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{
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auto* function = m_store.get(address);
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if (!function)
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return Trap {};
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if (auto* wasm_function = function->get_pointer<WasmFunction>()) {
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Vector<Value> locals;
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locals.ensure_capacity(arguments.size() + wasm_function->code().locals().size());
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for (auto& value : arguments)
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locals.append(Value { value });
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for (auto& type : wasm_function->code().locals())
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locals.empend(type, 0ull);
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auto frame = make<Frame>(
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wasm_function->module(),
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move(locals),
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wasm_function->code().body(),
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wasm_function->type().results().size());
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set_frame(move(frame));
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return execute();
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}
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// It better be a host function, else something is really wrong.
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auto& host_function = function->get<HostFunction>();
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auto result = bit_cast<HostFunctionType>(host_function.ptr())(m_store, arguments);
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auto count = host_function.type().results().size();
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if (count == 0)
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return Result { Vector<Value> {} };
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if (count == 1)
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return Result { Vector<Value> { Value { host_function.type().results().first(), result } } };
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TODO();
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}
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Result Configuration::execute()
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{
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Interpreter interpreter;
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interpreter.interpret(*this);
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Vector<NonnullOwnPtr<Value>> results;
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for (size_t i = 0; i < m_current_frame->arity(); ++i)
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results.append(move(stack().pop().get<NonnullOwnPtr<Value>>()));
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auto label = stack().pop();
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// ASSERT: label == current frame
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if (!label.has<NonnullOwnPtr<Label>>())
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return Trap {};
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Vector<Value> results_moved;
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results_moved.ensure_capacity(results.size());
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for (auto& entry : results)
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results_moved.unchecked_append(move(*entry));
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return Result { move(results_moved) };
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}
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}
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