This patch corrects a problem in the compiler whereby the determination of
scope levels during the generation of accessibility checks for function calls
within range constraints leads to a compiler crash due to the type not being
fully analyzed at the point in which its scope depth must be obtained.
Tested on x86_64-pc-linux-gnu, committed on trunk
gcc/ada/
* sem_util.adb
(Innermost_Master_Scope_Depth): Detect and handle case where scope
depth is not set on an enclosing scope.diff --git a/gcc/ada/sem_util.adb b/gcc/ada/sem_util.adb
--- a/gcc/ada/sem_util.adb
+++ b/gcc/ada/sem_util.adb
@@ -316,8 +316,20 @@ package body Sem_Util is
-- Ignore transient scopes made during expansion
if Comes_From_Source (Node_Par) then
- return
- Scope_Depth (Encl_Scop) + Master_Lvl_Modifier;
+ -- Note that in some rare cases the scope depth may not be
+ -- set, for example, when we are in the middle of analyzing
+ -- a type and the enclosing scope is said type. So, instead,
+ -- continue to move up the parent chain since the scope
+ -- depth of the type's parent is the same as that of the
+ -- type.
+
+ if not Scope_Depth_Set (Encl_Scop) then
+ pragma Assert (Nkind (Parent (Encl_Scop))
+ = N_Full_Type_Declaration);
+ else
+ return
+ Scope_Depth (Encl_Scop) + Master_Lvl_Modifier;
+ end if;
end if;
-- For a return statement within a function, return
