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LibWasm: Stub out/implement parsing of all ElementSection segments

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Previously, this was parsing only one kind because I mistakenly assumed
that they all had the same shape, now it can parse two kinds, and will
return NotImplemented for the rest.
This commit is contained in:
Ali Mohammad Pur 2021-05-01 22:49:17 +04:30 • committed by Linus Groh
parent 4d9246ac9d
commit a5194274af
5 changed files with 235 additions and 81 deletions
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29
Userland/Libraries/LibWasm/AbstractMachine/AbstractMachine.cpp
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@ -91,7 +91,7 @@ InstantiationResult AbstractMachine::instantiate(const Module& module, Vector<Ex
m_module_instance.types() = section.types();
});
// TODO: Validate stuff
// FIXME: Validate stuff
Vector<Value> global_values;
ModuleInstance auxiliary_instance;
@ -125,29 +125,10 @@ InstantiationResult AbstractMachine::instantiate(const Module& module, Vector<Ex
return result.error();
}
module.for_each_section_of_type<ElementSection>([&](const ElementSection& element_section) {
auto frame = make<Frame>(
m_module_instance,
Vector<Value> {},
element_section.function().offset(),
1);
Configuration config { m_store };
config.set_frame(move(frame));
auto result = config.execute();
// What if this traps?
VERIFY(!result.is_trap());
size_t offset = 0;
result.values().first().value().visit(
[&](const auto& value) { offset = value; },
[&](const FunctionAddress&) { VERIFY_NOT_REACHED(); },
[&](const ExternAddress&) { VERIFY_NOT_REACHED(); });
// FIXME: Module::get(*Index)
auto table_address = m_module_instance.tables().at(element_section.function().table().value());
if (auto table_instance = m_store.get(table_address)) {
auto& init = element_section.function().init();
for (size_t i = 0; i < init.size(); ++i)
table_instance->elements()[offset + i] = Reference { Reference::Func { init[i].value() } }; // HACK!
}
module.for_each_section_of_type<ElementSection>([&](const ElementSection&) {
// FIXME: Implement me
// https://webassembly.github.io/spec/core/bikeshed/#element-segments%E2%91%A0
// https://webassembly.github.io/spec/core/bikeshed/#instantiation%E2%91%A1 step 9
});
module.for_each_section_of_type<DataSection>([&](const DataSection& data_section) {