feat: added support for recursive calls

Author: Zffu

examples/fib.qf

@@ -0,0 +1,8 @@
+func fib(si32 i) si32 {
+	if(i <= 1_si32) {
+		ret 1
+	}
+
+	var si32 test = fib(i - 1_si32) + fib(i - 2_si32)
+	ret test
+}

ir/src/conv/func.rs

@@ -92,7 +92,7 @@ pub fn parse_ir_body(ctx: &IRContext, func: &mut IRFunction, nodes: Vec<Box<ASTT
 }
 
 pub fn parse_ir_function_call(ctx: &IRContext, f: &IRFunction, node: Box<ASTTreeNode>, owner: Option<IRPointer>, grab_result: bool) -> PositionlessResult<Option<IRValueRef>> {
-	if let ASTTreeNode::FunctionCall { func, args } = *node {
+	if let ASTTreeNode::FunctionCall { func: ff, args } = *node {
 		let mut arguments = vec![];
 
 		if owner.as_ref().is_some() {
@@ -103,9 +103,16 @@ pub fn parse_ir_function_call(ctx: &IRContext, f: &IRFunction, node: Box<ASTTree
 			arguments.push(parse_ir_value(Some(&f), ctx, v, None, false)?);
 		}
 
-		let func = ctx.get_function(func.hash)?;
 
-		let ret = func.call(ctx, arguments, grab_result)?;
+		let ret;
+
+		if ff.hash == f.hash {
+			ret = f.call(ctx, arguments, grab_result)?;
+		} else {
+			let func = ctx.get_function(ff.hash)?;
+
+			ret = func.call(ctx, arguments, grab_result)?;
+		}
 
 		if !grab_result || ret.is_none() {
 			return Ok(None);