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LibJS: Add conditional expression bytecode generation

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Or, by its more common name, the ternary operator :^)
This commit is contained in:
Luke 2021-06-08 04:54:34 +01:00 • committed by Linus Groh
parent 6da587b59b
commit de3ee701ce
2 changed files with 20 additions and 0 deletions
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19
Userland/Libraries/LibJS/Bytecode/ASTCodegen.cpp
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@ -430,4 +430,23 @@ Optional<Bytecode::Register> DebuggerStatement::generate_bytecode(Bytecode::Gene
return {};
}
Optional<Bytecode::Register> ConditionalExpression::generate_bytecode(Bytecode::Generator& generator) const
{
auto result_reg = generator.allocate_register();
auto test_reg = m_test->generate_bytecode(generator);
auto& alternate_jump = generator.emit<Bytecode::Op::JumpIfFalse>(*test_reg);
auto consequent_reg = m_consequent->generate_bytecode(generator);
generator.emit<Bytecode::Op::LoadRegister>(result_reg, *consequent_reg);
auto& end_jump = generator.emit<Bytecode::Op::Jump>();
alternate_jump.set_target(generator.make_label());
auto alternative_reg = m_alternate->generate_bytecode(generator);
generator.emit<Bytecode::Op::LoadRegister>(result_reg, *alternative_reg);
end_jump.set_target(generator.make_label());
return result_reg;
}
}