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LibJS: Actually generate a lexical env for SwitchStatement in BC

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We had code for this in ScopeNode, but that function was never called
for a SwitchStatement.
This fixes a bunch of scoping tests for switch.
This commit is contained in:
Ali Mohammad Pur
2022-04-03 02:13:51 +04:30
committed by Andreas Kling
parent 0e1943937c
commit 4b5a9bab34
1 changed files with 15 additions and 1 deletions
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16
Userland/Libraries/LibJS/Bytecode/ASTCodegen.cpp
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@@ -32,7 +32,9 @@ Bytecode::CodeGenerationErrorOr<void> ScopeNode::generate_bytecode(Bytecode::Gen
size_t pushed_scope_count = 0;
auto const failing_completion = Completion(Completion::Type::Throw, {}, {});
if (is<BlockStatement>(*this) || is<SwitchStatement>(*this)) {
// Note: SwitchStatement has its own codegen, but still calls into this function to handle the scoping of the switch body.
auto is_switch_statement = is<SwitchStatement>(*this);
if (is<BlockStatement>(*this) || is_switch_statement) {
// Perform the steps of BlockDeclarationInstantiation.
if (has_lexical_declarations()) {
generator.begin_variable_scope(Bytecode::Generator::BindingMode::Lexical, Bytecode::Generator::SurroundingScopeKind::Block);
@@ -59,6 +61,10 @@ Bytecode::CodeGenerationErrorOr<void> ScopeNode::generate_bytecode(Bytecode::Gen
return {};
});
if (is_switch_statement)
return {};
} else if (is<Program>(*this)) {
// Perform the steps of GlobalDeclarationInstantiation.
generator.begin_variable_scope(Bytecode::Generator::BindingMode::Global, Bytecode::Generator::SurroundingScopeKind::Global);
@@ -1615,7 +1621,13 @@ Bytecode::CodeGenerationErrorOr<void> SwitchStatement::generate_bytecode(Bytecod
Vector<Bytecode::BasicBlock&> case_blocks;
Bytecode::BasicBlock* default_block { nullptr };
Bytecode::BasicBlock* next_test_block = &generator.make_block();
auto has_lexical_block = has_lexical_declarations();
// Note: This call ends up calling begin_variable_scope() if has_lexical_block is true, so we need to clean up after it at the end.
TRY(ScopeNode::generate_bytecode(generator));
generator.emit<Bytecode::Op::Jump>().set_targets(Bytecode::Label { *next_test_block }, {});
for (auto& switch_case : m_cases) {
auto& case_block = generator.make_block();
if (switch_case.test()) {
@@ -1661,6 +1673,8 @@ Bytecode::CodeGenerationErrorOr<void> SwitchStatement::generate_bytecode(Bytecod
current_block++;
}
generator.end_breakable_scope();
if (has_lexical_block)
generator.end_variable_scope();
generator.switch_to_basic_block(end_block);
return {};