Multiple return values working!

ast.cpp

@@ -139,6 +139,7 @@ struct Ast_Builtin: Ast_Expr{
 //
 
 struct Ast_Return: Ast{
+  Ast_Type *resolved_type;
   Array<Ast_Expr *> expr;
 };
 

ccodegen.cpp

@@ -30,7 +30,7 @@ string_scope_name(Allocator *a, Ast_Scope *scope){
   String string = {};
   if(!should_gen_scope_name) return string;
   if(scope->parent_scope) string = string_scope_name(a, scope->parent_scope);
-  if(scope->name.str) string_fmt(a, "%Q%Q_", string, scope->name);
+  if(scope->name.str) string = string_fmt(a, "%Q%Q_", string, scope->name);
   return string;
 }
 
@@ -41,6 +41,18 @@ gen_scope_name(Ast_Scope *scope){
   gen("%.*s", (int)string.len, string.str);
 }
 
+function String
+unique_name(Allocator *allocator, Ast *ast){
+  Scratch scratch;
+  B32 temp = should_gen_scope_name;
+  should_gen_scope_name = true;
+  String result = string_scope_name(scratch, ast->parent_scope);
+  should_gen_scope_name = temp;
+  assert(result.len);
+  result = string_fmt(allocator, "%Q%d", result, ast->pos->line);
+  return result;
+}
+
 // @todo: Gen complicated decl
 //array 10 ( pointer (pointer array 5 int a))
 // int (*(*(a[5])))[10]
@@ -68,6 +80,10 @@ string_simple_decl_prefix(Allocator *a, Ast_Type *ast, bool scope_names){
       string = string_fmt(a, "Slice%llu ", ast->type_id);
       return string;
     }break;
+    case TYPE_TUPLE:{
+      String string = string_fmt(a, "Tuple%llu ", ast->type_id);
+      return string;
+    }break;
     case TYPE_STRUCT: {
       auto constant = (Ast_Decl *)ast->ast;
       auto name = constant->name;
@@ -213,10 +229,7 @@ gen_lambda(Intern_String name, Ast_Lambda *lambda, B32 generate_block = true){
   if(name == pctx->intern("main"_s) || name == pctx->intern("WinMain"_s)){
     is_foreign = true;
   }
-  if(lambda->resolved_type->func.ret->kind == TYPE_TUPLE){
-    gen("TUPLE ");
-  }
-  else gen_simple_decl(lambda->resolved_type->func.ret, name, lambda->parent_scope, !is_foreign);
+  gen_simple_decl(lambda->resolved_type->func.ret, name, lambda->parent_scope, !is_foreign);
   gen("(");
   For(lambda->args){
     gen_var(it, DONT_EMIT_VALUE, true);
@@ -382,10 +395,17 @@ gen_ast(Ast *ast){
 
     CASE(RETURN, Return){
       gen("return ");
-      For(node->expr){
-        gen(" ");
-        gen_expr(it); // @todo multiple_returns
+      if(is_tuple(node->resolved_type)) {
+        gen("(");
+        gen_simple_decl(node->resolved_type);
+        gen("){");
       }
+      For(node->expr){
+        gen_expr(it); // @todo multiple_returns
+        if(!node->expr.is_last(&it))
+          gen(", ");
+      }
+      if(is_tuple(node->resolved_type)) gen("}");
       gen(";");
       BREAK();
     }
@@ -528,11 +548,20 @@ gen_ast(Ast *ast){
     }
 
     CASE(VAR_UNPACK, Var_Unpack){
-      For(node->vars) {
-        gen_ast(it);
-      }
+      For(node->vars) {gen_ast(it);}
+
+      Scratch scratch;
+      gen_simple_decl(node->resolved_type);
+      String var_name = unique_name(scratch, node);
+      gen("%Q", var_name);
       gen(" = ");
       gen_expr(node->expr);
+      gen(";");
+
+      int i = 0;
+      For(node->vars) {
+        gen("%Q = %Q.m%d;", it->name, var_name, i);
+      }
       BREAK();
     }
 

typechecking.cpp

@@ -435,6 +435,7 @@ resolve_stmt(Ast *ast, Ast_Type *ret){
       value = convert_untyped_to_typed(node->pos, value, ret);
       if(value.type && value.type != ret)
         compiler_error(node->pos, "Return statement has different type then returned value, expecting: %s got instead %s", docname(ret), docname(type));
+      node->resolved_type = value.type;
       BREAK();
     }