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LibJS: Implement bytecode generation for BreakStatement

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This commit is contained in:
xyanrch 2021-06-10 20:28:43 +08:00 • committed by Ali Mohammad Pur
parent 73cf16f643
commit a0412e0d5e
4 changed files with 31 additions and 3 deletions
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1
Userland/Libraries/LibJS/AST.h
View file

@ -1300,6 +1300,7 @@ public:
virtual Value execute(Interpreter&, GlobalObject&) const override;
const FlyString& target_label() const { return m_target_label; }
virtual void generate_bytecode(Bytecode::Generator&) const override;
private:
FlyString m_target_label;

15
Userland/Libraries/LibJS/Bytecode/ASTCodegen.cpp
View file

@ -376,13 +376,14 @@ void WhileStatement::generate_bytecode(Bytecode::Generator& generator) const
generator.switch_to_basic_block(body_block);
generator.begin_continuable_scope(Bytecode::Label { test_block });
generator.begin_breakable_scope(Bytecode::Label { end_block });
m_body->generate_bytecode(generator);
if (!generator.is_current_block_terminated()) {
generator.emit<Bytecode::Op::Jump>().set_targets(
Bytecode::Label { test_block },
{});
generator.end_continuable_scope();
generator.end_breakable_scope();
generator.switch_to_basic_block(end_block);
generator.emit<Bytecode::Op::Load>(result_reg);
}
@ -418,13 +419,14 @@ void DoWhileStatement::generate_bytecode(Bytecode::Generator& generator) const
generator.switch_to_basic_block(body_block);
generator.begin_continuable_scope(Bytecode::Label { test_block });
generator.begin_breakable_scope(Bytecode::Label { end_block });
m_body->generate_bytecode(generator);
if (!generator.is_current_block_terminated()) {
generator.emit<Bytecode::Op::Jump>().set_targets(
Bytecode::Label { test_block },
{});
generator.end_continuable_scope();
generator.end_breakable_scope();
generator.switch_to_basic_block(end_block);
generator.emit<Bytecode::Op::Load>(result_reg);
}
@ -484,6 +486,7 @@ void ForStatement::generate_bytecode(Bytecode::Generator& generator) const
generator.switch_to_basic_block(*body_block_ptr);
generator.begin_continuable_scope(Bytecode::Label { *update_block_ptr });
generator.begin_breakable_scope(Bytecode::Label { end_block });
m_body->generate_bytecode(generator);
generator.end_continuable_scope();
@ -501,6 +504,7 @@ void ForStatement::generate_bytecode(Bytecode::Generator& generator) const
Bytecode::Label { *test_block_ptr },
{});
generator.end_breakable_scope();
generator.switch_to_basic_block(end_block);
generator.emit<Bytecode::Op::Load>(result_reg);
}
@ -787,4 +791,11 @@ void ThrowStatement::generate_bytecode(Bytecode::Generator& generator) const
generator.emit<Bytecode::Op::Throw>();
}
void BreakStatement::generate_bytecode(Bytecode::Generator& generator) const
{
generator.emit<Bytecode::Op::Jump>().set_targets(
generator.nearest_breakable_scope(),
{});
}
}

14
Userland/Libraries/LibJS/Bytecode/Generator.cpp
View file

@ -62,5 +62,17 @@ void Generator::end_continuable_scope()
{
m_continuable_scopes.take_last();
}
Label Generator::nearest_breakable_scope() const
{
return m_breakable_scopes.last();
}
void Generator::begin_breakable_scope(Label breakable_target)
{
m_breakable_scopes.append(breakable_target);
}
void Generator::end_breakable_scope()
{
m_breakable_scopes.take_last();
}
}

4
Userland/Libraries/LibJS/Bytecode/Generator.h
View file

@ -57,8 +57,11 @@ public:
void begin_continuable_scope(Label continue_target);
void end_continuable_scope();
void begin_breakable_scope(Label breakable_target);
void end_breakable_scope();
[[nodiscard]] Label nearest_continuable_scope() const;
[[nodiscard]] Label nearest_breakable_scope() const;
void switch_to_basic_block(BasicBlock& block)
{
@ -97,6 +100,7 @@ private:
u32 m_next_register { 1 };
u32 m_next_block { 1 };
Vector<Label> m_continuable_scopes;
Vector<Label> m_breakable_scopes;
};
}