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LibJS/Bytecode: Leave BlockDeclarationInstantiation in C++

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Instead of implementing this AO in bytecode, we now have an instruction
for it that simply invokes the C++ implementation.

This allows us to simplify Bytecode::Generator quite a bit by removing
all the variable scope tracking.
This commit is contained in:
Andreas Kling 2023-06-16 16:34:47 +02:00
parent 4684d3fe54
commit ac246d764d
6 changed files with 56 additions and 91 deletions
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30
Userland/Libraries/LibJS/Bytecode/Generator.cpp
View file

@ -87,30 +87,24 @@ Label Generator::nearest_continuable_scope() const
return m_continuable_scopes.last().bytecode_target;
}
void Generator::begin_variable_scope(BindingMode mode, SurroundingScopeKind kind)
void Generator::block_declaration_instantiation(ScopeNode const& scope_node)
{
m_variable_scopes.append({ kind, mode, {} });
if (mode != BindingMode::Global) {
start_boundary(mode == BindingMode::Lexical ? BlockBoundaryType::LeaveLexicalEnvironment : BlockBoundaryType::LeaveVariableEnvironment);
emit<Bytecode::Op::CreateEnvironment>(
mode == BindingMode::Lexical
? Bytecode::Op::EnvironmentMode::Lexical
: Bytecode::Op::EnvironmentMode::Var);
}
start_boundary(BlockBoundaryType::LeaveLexicalEnvironment);
emit<Bytecode::Op::BlockDeclarationInstantiation>(scope_node);
}
void Generator::begin_variable_scope()
{
start_boundary(BlockBoundaryType::LeaveLexicalEnvironment);
emit<Bytecode::Op::CreateEnvironment>(Bytecode::Op::EnvironmentMode::Lexical);
}
void Generator::end_variable_scope()
{
auto mode = m_variable_scopes.take_last().mode;
if (mode != BindingMode::Global) {
end_boundary(mode == BindingMode::Lexical ? BlockBoundaryType::LeaveLexicalEnvironment : BlockBoundaryType::LeaveVariableEnvironment);
end_boundary(BlockBoundaryType::LeaveLexicalEnvironment);
if (!m_current_basic_block->is_terminated()) {
emit<Bytecode::Op::LeaveEnvironment>(
mode == BindingMode::Lexical
? Bytecode::Op::EnvironmentMode::Lexical
: Bytecode::Op::EnvironmentMode::Var);
}
if (!m_current_basic_block->is_terminated()) {
emit<Bytecode::Op::LeaveEnvironment>(Bytecode::Op::EnvironmentMode::Lexical);
}
}