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931b554f68
The average wasm function rarely goes over these bounds for the labels (32 nested control structures), and 8 frames is just enough to clear most initialization code/start section without allocating anything.
77 lines
2.5 KiB
C++
77 lines
2.5 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 <AK/MemoryStream.h>
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#include <LibWasm/AbstractMachine/Configuration.h>
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#include <LibWasm/AbstractMachine/Interpreter.h>
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#include <LibWasm/Printer/Printer.h>
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namespace Wasm {
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void Configuration::unwind(Badge<CallFrameHandle>, CallFrameHandle const& frame_handle)
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{
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m_frame_stack.take_last();
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m_depth--;
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m_ip = frame_handle.ip;
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}
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Result Configuration::call(Interpreter& interpreter, 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::from_string("Attempt to call nonexistent function by address");
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if (auto* wasm_function = function->get_pointer<WasmFunction>()) {
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Vector<Value> locals = move(arguments);
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locals.ensure_capacity(locals.size() + wasm_function->code().func().locals().size());
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for (auto& local : wasm_function->code().func().locals()) {
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for (size_t i = 0; i < local.n(); ++i)
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locals.append(Value(local.type()));
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}
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set_frame(Frame {
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wasm_function->module(),
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move(locals),
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wasm_function->code().func().body(),
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wasm_function->type().results().size(),
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});
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m_ip = 0;
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return execute(interpreter);
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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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return host_function.function()(*this, arguments);
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}
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Result Configuration::execute(Interpreter& interpreter)
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{
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interpreter.interpret(*this);
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if (interpreter.did_trap())
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return interpreter.trap();
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Vector<Value> results { value_stack().span().slice_from_end(frame().arity()) };
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value_stack().shrink(value_stack().size() - results.size(), true);
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results.reverse();
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label_stack().take_last();
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return Result { move(results) };
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}
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void Configuration::dump_stack()
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{
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auto print_value = []<typename... Ts>(CheckedFormatString<Ts...> format, Ts... vs) {
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AllocatingMemoryStream memory_stream;
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Printer { memory_stream }.print(vs...);
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auto buffer = ByteBuffer::create_uninitialized(memory_stream.used_buffer_size()).release_value_but_fixme_should_propagate_errors();
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memory_stream.read_until_filled(buffer).release_value_but_fixme_should_propagate_errors();
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dbgln(format.view(), StringView(buffer).trim_whitespace());
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};
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for (auto const& value : value_stack()) {
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print_value(" {}", value);
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}
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}
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}
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