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added if expr

This commit is contained in:
pca006132 2021-08-05 16:52:41 +08:00
parent 29286210b5
commit 095f28468b
1 changed files with 23 additions and 0 deletions
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23
nac3core/src/codegen/expr.rs
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@ -383,6 +383,29 @@ impl<'ctx> CodeGenContext<'ctx> {
.unwrap()
.into() // as there should be at least 1 element, it should never be none
}
ExprKind::IfExp { test, body, orelse } => {
let test = if let BasicValueEnum::IntValue(test) = self.gen_expr(test) {
test
} else {
unreachable!()
};
let current = self.builder.get_insert_block().unwrap().get_parent().unwrap();
let then_bb = self.ctx.append_basic_block(current, "then");
let else_bb = self.ctx.append_basic_block(current, "else");
let cont_bb = self.ctx.append_basic_block(current, "cont");
self.builder.build_conditional_branch(test, then_bb, else_bb);
self.builder.position_at_end(then_bb);
let a = self.gen_expr(body);
self.builder.build_unconditional_branch(cont_bb);
self.builder.position_at_end(else_bb);
let b = self.gen_expr(orelse);
self.builder.build_unconditional_branch(cont_bb);
self.builder.position_at_end(cont_bb);
let phi = self.builder.build_phi(a.get_type(), "ifexpr");
phi.add_incoming(&[(&a, then_bb), (&b, else_bb)]);
phi.as_basic_value()
}
_ => unimplemented!(),
}
}