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LibJS: Add BytecodeGenerator helpers for reference get/put

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This allows code sharing between all AST nodes that want to get and/or
put through a reference.
This commit is contained in:
Andreas Kling 2021-10-25 15:16:22 +02:00
parent b63d17e2f8
commit 1dc60b028f
2 changed files with 64 additions and 0 deletions
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61
Userland/Libraries/LibJS/Bytecode/Generator.cpp
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@ -93,4 +93,65 @@ void Generator::end_breakable_scope()
{
m_breakable_scopes.take_last();
}
void Generator::emit_load_from_reference(JS::ASTNode const& node)
{
if (is<Identifier>(node)) {
auto& identifier = static_cast<Identifier const&>(node);
emit<Bytecode::Op::GetVariable>(intern_identifier(identifier.string()));
return;
}
if (is<MemberExpression>(node)) {
auto& expression = static_cast<MemberExpression const&>(node);
expression.object().generate_bytecode(*this);
auto object_reg = allocate_register();
emit<Bytecode::Op::Store>(object_reg);
if (expression.is_computed()) {
expression.property().generate_bytecode(*this);
emit<Bytecode::Op::GetByValue>(object_reg);
} else {
auto identifier_table_ref = intern_identifier(verify_cast<Identifier>(expression.property()).string());
emit<Bytecode::Op::GetById>(identifier_table_ref);
}
return;
}
VERIFY_NOT_REACHED();
}
void Generator::emit_store_to_reference(JS::ASTNode const& node)
{
if (is<Identifier>(node)) {
auto& identifier = static_cast<Identifier const&>(node);
emit<Bytecode::Op::SetVariable>(intern_identifier(identifier.string()));
return;
}
if (is<MemberExpression>(node)) {
// NOTE: The value is in the accumulator, so we have to store that away first.
auto value_reg = allocate_register();
emit<Bytecode::Op::Store>(value_reg);
auto& expression = static_cast<MemberExpression const&>(node);
expression.object().generate_bytecode(*this);
auto object_reg = allocate_register();
emit<Bytecode::Op::Store>(object_reg);
if (expression.is_computed()) {
expression.property().generate_bytecode(*this);
auto property_reg = allocate_register();
emit<Bytecode::Op::Store>(property_reg);
emit<Bytecode::Op::Load>(value_reg);
emit<Bytecode::Op::PutByValue>(object_reg, property_reg);
} else {
emit<Bytecode::Op::Load>(value_reg);
auto identifier_table_ref = intern_identifier(verify_cast<Identifier>(expression.property()).string());
emit<Bytecode::Op::PutById>(object_reg, identifier_table_ref);
}
return;
}
VERIFY_NOT_REACHED();
}
}