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LibJS/Bytecode: Implement destructuring assignment

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This commit is contained in:
Luke Wilde 2022-07-17 19:24:37 +01:00 • committed by Linus Groh
parent f99f5d740e
commit 0151dc562a
1 changed files with 14 additions and 3 deletions
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17
Userland/Libraries/LibJS/Bytecode/ASTCodegen.cpp
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@ -521,6 +521,8 @@ Bytecode::CodeGenerationErrorOr<void> Identifier::generate_bytecode(Bytecode::Ge
return {};
}
static Bytecode::CodeGenerationErrorOr<void> generate_binding_pattern_bytecode(Bytecode::Generator& generator, BindingPattern const& pattern, Bytecode::Op::SetVariable::InitializationMode, Bytecode::Register const& value_reg);
Bytecode::CodeGenerationErrorOr<void> AssignmentExpression::generate_bytecode(Bytecode::Generator& generator) const
{
if (m_op == AssignmentOp::Assignment) {
@ -600,7 +602,18 @@ Bytecode::CodeGenerationErrorOr<void> AssignmentExpression::generate_bytecode(By
},
// 2. Let assignmentPattern be the AssignmentPattern that is covered by LeftHandSideExpression.
[&](NonnullRefPtr<BindingPattern> const& pattern) -> Bytecode::CodeGenerationErrorOr<void> {
TODO();
// 3. Let rref be the result of evaluating AssignmentExpression.
// 4. Let rval be ? GetValue(rref).
TRY(m_rhs->generate_bytecode(generator));
auto value_register = generator.allocate_register();
generator.emit<Bytecode::Op::Store>(value_register);
// 5. Perform ? DestructuringAssignmentEvaluation of assignmentPattern with argument rval.
TRY(generate_binding_pattern_bytecode(generator, pattern, Bytecode::Op::SetVariable::InitializationMode::Set, value_register));
// 6. Return rval.
generator.emit<Bytecode::Op::Load>(value_register);
return {};
});
}
@ -1107,8 +1120,6 @@ Bytecode::CodeGenerationErrorOr<void> FunctionExpression::generate_bytecode(Byte
return {};
}
static Bytecode::CodeGenerationErrorOr<void> generate_binding_pattern_bytecode(Bytecode::Generator& generator, BindingPattern const& pattern, Bytecode::Op::SetVariable::InitializationMode, Bytecode::Register const& value_reg);
static Bytecode::CodeGenerationErrorOr<void> generate_object_binding_pattern_bytecode(Bytecode::Generator& generator, BindingPattern const& pattern, Bytecode::Op::SetVariable::InitializationMode initialization_mode, Bytecode::Register const& value_reg)
{
Vector<Bytecode::Register> excluded_property_names;