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LibJS: Support object destructuring in the bytecode interpreter

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Matthew Olsson 2021-06-13 12:24:55 -07:00 committed by Andreas Kling
parent f39ab2e60a
commit 1f8e643ef0
1 changed files with 64 additions and 3 deletions
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67
Userland/Libraries/LibJS/Bytecode/ASTCodegen.cpp
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@ -639,6 +639,65 @@ void FunctionExpression::generate_bytecode(Bytecode::Generator& generator) const
generator.emit<Bytecode::Op::NewFunction>(*this);
}
static void generate_binding_pattern_bytecode(Bytecode::Generator& generator, BindingPattern const& pattern, Bytecode::Register const& value, bool object_pattern)
{
for (auto& [name, alias, initializer, is_rest] : pattern.entries) {
if (is_rest)
TODO();
if (object_pattern) {
Bytecode::StringTableIndex name_index;
if (name.has<NonnullRefPtr<Identifier>>()) {
auto identifier = name.get<NonnullRefPtr<Identifier>>()->string();
name_index = generator.intern_string(identifier);
generator.emit<Bytecode::Op::Load>(value);
generator.emit<Bytecode::Op::GetById>(name_index);
} else {
auto expression = name.get<NonnullRefPtr<Expression>>();
expression->generate_bytecode(generator);
generator.emit<Bytecode::Op::GetByValue>(value);
}
if (initializer) {
auto& if_undefined_block = generator.make_block();
auto& if_not_undefined_block = generator.make_block();
generator.emit<Bytecode::Op::JumpUndefined>().set_targets(
Bytecode::Label { if_undefined_block },
Bytecode::Label { if_not_undefined_block });
generator.switch_to_basic_block(if_undefined_block);
initializer->generate_bytecode(generator);
generator.emit<Bytecode::Op::Jump>().set_targets(
Bytecode::Label { if_not_undefined_block },
{});
generator.switch_to_basic_block(if_not_undefined_block);
}
if (alias.has<NonnullRefPtr<BindingPattern>>()) {
auto& binding_pattern = *alias.get<NonnullRefPtr<BindingPattern>>();
auto nested_value_reg = generator.allocate_register();
generator.emit<Bytecode::Op::Store>(nested_value_reg);
generate_binding_pattern_bytecode(generator, binding_pattern, nested_value_reg, binding_pattern.kind == BindingPattern::Kind::Object);
} else if (alias.has<Empty>()) {
if (name.has<NonnullRefPtr<Expression>>()) {
// This needs some sort of SetVariableByValue opcode, as it's a runtime binding
TODO();
}
generator.emit<Bytecode::Op::SetVariable>(name_index);
} else {
auto& identifier = alias.get<NonnullRefPtr<Identifier>>()->string();
generator.emit<Bytecode::Op::SetVariable>(generator.intern_string(identifier));
}
} else {
TODO();
}
}
};
void VariableDeclaration::generate_bytecode(Bytecode::Generator& generator) const
{
for (auto& declarator : m_declarations) {
@ -647,11 +706,13 @@ void VariableDeclaration::generate_bytecode(Bytecode::Generator& generator) cons
else
generator.emit<Bytecode::Op::LoadImmediate>(js_undefined());
declarator.target().visit(
[&](const NonnullRefPtr<Identifier>& id) {
[&](NonnullRefPtr<Identifier> const& id) {
generator.emit<Bytecode::Op::SetVariable>(generator.intern_string(id->string()));
},
[&](const NonnullRefPtr<BindingPattern>&) {
TODO();
[&](NonnullRefPtr<BindingPattern> const& pattern) {
auto value_register = generator.allocate_register();
generator.emit<Bytecode::Op::Store>(value_register);
generate_binding_pattern_bytecode(generator, pattern, value_register, pattern->kind == BindingPattern::Kind::Object);
});
}
}