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support while loop

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This commit is contained in:
Sebastien Bourdeauducq 2020-03-30 18:23:32 +08:00
parent 43bc7392ff
commit ef01a86c2f
1 changed files with 26 additions and 0 deletions
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26
src/main.rs
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@ -423,6 +423,32 @@ impl<'ctx> CodeGen<'ctx> {
self.builder.build_unconditional_branch(cont_bb);
self.builder.position_at_end(cont_bb);
},
While { test, body, orelse } => {
let parent = self.builder.get_insert_block().unwrap().get_parent().unwrap();
let test_bb = self.context.append_basic_block(parent, "test");
self.builder.build_unconditional_branch(test_bb);
self.builder.position_at_end(test_bb);
let test = self.compile_expression(test)?;
if test.get_type() != self.context.bool_type().into() {
return Err(self.compile_error(CompileErrorKind::IncompatibleTypes));
}
let then_bb = self.context.append_basic_block(parent, "then");
let else_bb = self.context.append_basic_block(parent, "else");
let cont_bb = self.context.append_basic_block(parent, "ifcont");
self.builder.build_conditional_branch(test.into_int_value(), then_bb, else_bb);
self.builder.position_at_end(then_bb);
self.compile_suite(body, return_type)?;
self.builder.build_unconditional_branch(test_bb);
self.builder.position_at_end(else_bb);
if let Some(orelse) = orelse {
self.compile_suite(orelse, return_type)?;
}
self.builder.build_unconditional_branch(cont_bb);
self.builder.position_at_end(cont_bb);
},
Return { value: Some(value) } => {
if let Some(return_type) = return_type {
let value = self.compile_expression(value)?;