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LibJS: Don't generate code after we've encountered a terminating op

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This commit is contained in:
Gunnar Beutner 2021-06-09 19:57:18 +02:00 committed by Andreas Kling
parent d198e41f74
commit 6af7e74a25
1 changed files with 33 additions and 24 deletions
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57
Userland/Libraries/LibJS/Bytecode/ASTCodegen.cpp
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@ -23,8 +23,11 @@ void ASTNode::generate_bytecode(Bytecode::Generator&) const
void ScopeNode::generate_bytecode(Bytecode::Generator& generator) const
{
generator.emit<Bytecode::Op::EnterScope>(*this);
for (auto& child : children())
for (auto& child : children()) {
child.generate_bytecode(generator);
if (generator.is_current_block_terminated())
break;
}
}
void EmptyStatement::generate_bytecode(Bytecode::Generator&) const
@ -329,13 +332,15 @@ void WhileStatement::generate_bytecode(Bytecode::Generator& generator) const
generator.switch_to_basic_block(body_block);
generator.begin_continuable_scope(Bytecode::Label { test_block });
m_body->generate_bytecode(generator);
generator.emit<Bytecode::Op::Jump>().set_targets(
Bytecode::Label { test_block },
{});
generator.end_continuable_scope();
if (!generator.is_current_block_terminated()) {
generator.emit<Bytecode::Op::Jump>().set_targets(
Bytecode::Label { test_block },
{});
generator.end_continuable_scope();
generator.switch_to_basic_block(end_block);
generator.emit<Bytecode::Op::Load>(result_reg);
generator.switch_to_basic_block(end_block);
generator.emit<Bytecode::Op::Load>(result_reg);
}
}
void DoWhileStatement::generate_bytecode(Bytecode::Generator& generator) const
@ -369,13 +374,15 @@ void DoWhileStatement::generate_bytecode(Bytecode::Generator& generator) const
generator.switch_to_basic_block(body_block);
generator.begin_continuable_scope(Bytecode::Label { test_block });
m_body->generate_bytecode(generator);
generator.emit<Bytecode::Op::Jump>().set_targets(
Bytecode::Label { test_block },
{});
generator.end_continuable_scope();
if (!generator.is_current_block_terminated()) {
generator.emit<Bytecode::Op::Jump>().set_targets(
Bytecode::Label { test_block },
{});
generator.end_continuable_scope();
generator.switch_to_basic_block(end_block);
generator.emit<Bytecode::Op::Load>(result_reg);
generator.switch_to_basic_block(end_block);
generator.emit<Bytecode::Op::Load>(result_reg);
}
}
void ForStatement::generate_bytecode(Bytecode::Generator& generator) const
@ -435,21 +442,23 @@ void ForStatement::generate_bytecode(Bytecode::Generator& generator) const
m_body->generate_bytecode(generator);
generator.end_continuable_scope();
if (m_update) {
if (!generator.is_current_block_terminated()) {
if (m_update) {
generator.emit<Bytecode::Op::Jump>().set_targets(
Bytecode::Label { *update_block_ptr },
{});
generator.switch_to_basic_block(*update_block_ptr);
m_update->generate_bytecode(generator);
}
generator.emit<Bytecode::Op::Jump>().set_targets(
Bytecode::Label { *update_block_ptr },
Bytecode::Label { *test_block_ptr },
{});
generator.switch_to_basic_block(*update_block_ptr);
m_update->generate_bytecode(generator);
generator.switch_to_basic_block(end_block);
generator.emit<Bytecode::Op::Load>(result_reg);
}
generator.emit<Bytecode::Op::Jump>().set_targets(
Bytecode::Label { *test_block_ptr },
{});
generator.switch_to_basic_block(end_block);
generator.emit<Bytecode::Op::Load>(result_reg);
}
void ObjectExpression::generate_bytecode(Bytecode::Generator& generator) const