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support if/then/else

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This commit is contained in:
Sebastien Bourdeauducq 2020-03-30 17:33:01 +08:00
parent 38cdab01cb
commit aecf24c857
1 changed files with 38 additions and 5 deletions
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41
src/main.rs
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@ -127,7 +127,7 @@ impl<'ctx> CodeGen<'ctx> {
&mut self,
name: &str,
args: &ast::Parameters,
body: &[ast::Statement],
body: &ast::Suite,
decorator_list: &[ast::Expression],
returns: &Option<ast::Expression>,
is_async: bool,
@ -185,9 +185,8 @@ impl<'ctx> CodeGen<'ctx> {
self.namespace.insert(arg.arg.clone(), alloca);
}
for statement in body.iter() {
self.compile_statement(statement, return_type)?;
}
self.compile_suite(body, return_type)?;
Ok(function)
}
@ -398,7 +397,30 @@ impl<'ctx> CodeGen<'ctx> {
return Err(self.compile_error(CompileErrorKind::Unsupported("assignment target must be an identifier")))
}
}
},
If { test, body, orelse } => {
let test = self.compile_expression(test)?;
if test.get_type() != self.context.bool_type().into() {
return Err(self.compile_error(CompileErrorKind::IncompatibleTypes));
}
let parent = self.builder.get_insert_block().unwrap().get_parent().unwrap();
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(cont_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)?;
@ -422,6 +444,17 @@ impl<'ctx> CodeGen<'ctx> {
Ok(())
}
fn compile_suite(
&mut self,
suite: &ast::Suite,
return_type: Option<types::BasicTypeEnum>
) -> CompileResult<()> {
for statement in suite.iter() {
self.compile_statement(statement, return_type)?;
}
Ok(())
}
fn compile_toplevel(&mut self, statement: &ast::Statement) -> CompileResult<()> {
self.set_source_location(statement.location);
if let ast::StatementType::FunctionDef {