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/*
* Copyright (c) 2021, Ali Mohammad Pur <mpfard@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <LibWasm/AbstractMachine/Configuration.h>
#include <LibWasm/AbstractMachine/Interpreter.h>
namespace Wasm {
Optional<Label> Configuration::nth_label(size_t i)
{
for (size_t index = m_stack.size(); index > 0; --index) {
auto& entry = m_stack.entries()[index - 1];
if (auto ptr = entry.get_pointer<Label>()) {
if (i == 0)
return *ptr;
--i;
}
}
return {};
}
Result Configuration::call(FunctionAddress address, Vector<Value> arguments)
{
auto* function = m_store.get(address);
if (!function)
return Trap {};
if (auto* wasm_function = function->get_pointer<WasmFunction>()) {
Vector<Value> locals;
locals.ensure_capacity(arguments.size() + wasm_function->code().locals().size());
for (auto& value : arguments)
locals.append(Value { value });
for (auto& type : wasm_function->code().locals())
locals.empend(type, 0ull);
auto frame = make<Frame>(
wasm_function->module(),
move(locals),
wasm_function->code().body(),
wasm_function->type().results().size());
set_frame(move(frame));
return execute();
}
// It better be a host function, else something is really wrong.
auto& host_function = function->get<HostFunction>();
return host_function.function()(*this, arguments);
}
Result Configuration::execute()
{
Interpreter interpreter;
interpreter.pre_interpret_hook = pre_interpret_hook;
interpreter.post_interpret_hook = post_interpret_hook;
interpreter.interpret(*this);
if (interpreter.did_trap())
return Trap {};
Vector<Value> results;
results.ensure_capacity(m_current_frame->arity());
for (size_t i = 0; i < m_current_frame->arity(); ++i)
results.append(move(stack().pop().get<Value>()));
auto label = stack().pop();
// ASSERT: label == current frame
if (!label.has<Label>())
return Trap {};
return Result { move(results) };
}
void Configuration::dump_stack()
{
for (const auto& entry : stack().entries()) {
entry.visit(
[](const Value& v) {
v.value().visit([]<typename T>(const T& v) {
if constexpr (IsIntegral<T> || IsFloatingPoint<T>)
dbgln(" {}", v);
else
dbgln(" *{}", v.value());
});
},
[](const NonnullOwnPtr<Frame>& f) {
dbgln(" frame({})", f->arity());
for (auto& local : f->locals()) {
local.value().visit([]<typename T>(const T& v) {
if constexpr (IsIntegral<T> || IsFloatingPoint<T>)
dbgln(" {}", v);
else
dbgln(" *{}", v.value());
});
}
},
[](const Label& l) {
dbgln(" label({}) -> {}", l.arity(), l.continuation());
});
}
}
}
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