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LibJS/Bytecode: Implement initializers for array binding patterns

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Luke Wilde 2022-07-17 19:25:23 +01:00 • committed by Linus Groh
parent 0151dc562a
commit fe2efbb2fc
1 changed files with 17 additions and 0 deletions
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17
Userland/Libraries/LibJS/Bytecode/ASTCodegen.cpp
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@ -1270,6 +1270,8 @@ static Bytecode::CodeGenerationErrorOr<void> generate_array_binding_pattern_byte
VERIFY(name.has<Empty>());
if (is_rest) {
VERIFY(!initializer);
if (first) {
// The iterator has not been called, and is thus known to be not exhausted
generator.emit<Bytecode::Op::Load>(iterator_reg);
@ -1358,6 +1360,21 @@ static Bytecode::CodeGenerationErrorOr<void> generate_array_binding_pattern_byte
// pattern if necessary.
generator.switch_to_basic_block(create_binding_block);
if (initializer) {
auto& value_is_undefined_block = generator.make_block();
auto& value_is_not_undefined_block = generator.make_block();
generator.emit<Bytecode::Op::JumpUndefined>().set_targets(
Bytecode::Label { value_is_undefined_block },
Bytecode::Label { value_is_not_undefined_block });
generator.switch_to_basic_block(value_is_undefined_block);
TRY(initializer->generate_bytecode(generator));
generator.emit<Bytecode::Op::Jump>(Bytecode::Label { value_is_not_undefined_block });
generator.switch_to_basic_block(value_is_not_undefined_block);
}
TRY(assign_accumulator_to_alias(alias));
first = false;