[multiple changes]

2012-10-03  Ed Schonberg  <schonberg@adacore.com>

	* sem_ch6.adb (New_Overloaded_Entity): call
	Append_Inherited_Subprogram when appropriate.
	* sem_dim.adb (Analyze_Dimension_Call): Do not perform dimensional
	analysis if call has previous semantic error.
	* sem_util.ads, sem_util.adb (Append_Inherited_Subprogram):
	new subprogram to handle properly the visibility of inherited
	operations that are primitives of a type extension, when the
	parent type and operations are declared in the same visible part.

2012-10-03  Robert Dewar  <dewar@adacore.com>

	* checks.adb (Minimize_Eliminate_Overflow_Checks): Properly
	handle case of top level expression within type conversion
	* gnat1drv.adb (Adjust_Global_Switches): Set SUPPRESSED as
	default for overflow checking for -gnatg mode (includes run-time).
	* sem_res.adb (Resolve_Type_Conversion): Avoid bogus warnings
	about redundant conversions from MINIMIZED/EXTENDED mode checking

From-SVN: r192029

gcc/ada/ChangeLog

@@ -1,3 +1,23 @@
+2012-10-03  Ed Schonberg  <schonberg@adacore.com>
+
+	* sem_ch6.adb (New_Overloaded_Entity): call
+	Append_Inherited_Subprogram when appropriate.
+	* sem_dim.adb (Analyze_Dimension_Call): Do not perform dimensional
+	analysis if call has previous semantic error.
+	* sem_util.ads, sem_util.adb (Append_Inherited_Subprogram):
+	new subprogram to handle properly the visibility of inherited
+	operations that are primitives of a type extension, when the
+	parent type and operations are declared in the same visible part.
+
+2012-10-03  Robert Dewar  <dewar@adacore.com>
+
+	* checks.adb (Minimize_Eliminate_Overflow_Checks): Properly
+	handle case of top level expression within type conversion
+	* gnat1drv.adb (Adjust_Global_Switches): Set SUPPRESSED as
+	default for overflow checking for -gnatg mode (includes run-time).
+	* sem_res.adb (Resolve_Type_Conversion): Avoid bogus warnings
+	about redundant conversions from MINIMIZED/EXTENDED mode checking
+
 2012-10-03  Javier Miranda  <miranda@adacore.com>
 
 	* exp_ch4.adb (Expand_N_Allocator_Expression): Minor code

gcc/ada/checks.adb

@@ -7404,6 +7404,16 @@ package body Checks is
 
       elsif Top_Level
         and then not (Bignum_Operands or Long_Long_Integer_Operands)
+
+        --  One further refinement. If we are at the top level, but our parent
+        --  is a type conversion, then go into bignum or long long integer node
+        --  since the result will be converted to that type directly without
+        --  going through the result type, and we may avoid an overflow. This
+        --  is the case for example of Long_Long_Integer (A ** 4), where A is
+        --  of type Integer, and the result A ** 4 fits in Long_Long_Integer
+        --  but does not fit in Integer.
+
+        and then Nkind (Parent (N)) /= N_Type_Conversion
       then
          --  Here we will keep the original types, but we do need an overflow
          --  check, so we will set Do_Overflow_Check to True (actually it is
@@ -7561,12 +7571,6 @@ package body Checks is
 
       if Nkind (N) = N_Op_Expon and then Etype (Right_Opnd (N)) = LLIB then
          Convert_To_And_Rewrite (Standard_Natural, Right_Opnd (N));
-
-         --  Now Long_Long_Integer_Operands may have to be reset if that was
-         --  the only long long integer operand, i.e. we now have long long
-         --  integer operands only if the left operand is long long integer.
-
-         Long_Long_Integer_Operands := Etype (Left_Opnd (N)) = LLIB;
       end if;
 
       --  Here we will do the operation in Long_Long_Integer. We do this even

gcc/ada/gnat1drv.adb

@@ -334,6 +334,12 @@ procedure Gnat1drv is
       if Opt.Suppress_Options.Overflow_Checks_General /= Not_Set then
          null;
 
+      --  By default suppress overflow checks in -gnatg mode
+
+      elsif GNAT_Mode then
+         Suppress_Options.Overflow_Checks_General    := Suppressed;
+         Suppress_Options.Overflow_Checks_Assertions := Suppressed;
+
       --  If we have backend divide and overflow checks, then by default
       --  overflow checks are minimized, which is a reasonable setting.
 

gcc/ada/sem_ch6.adb

@@ -8063,7 +8063,12 @@ package body Sem_Ch6 is
 
       Set_Homonym (S, E);
 
-      Append_Entity (S, Current_Scope);
+      if Is_Inherited_Operation (S) then
+         Append_Inherited_Subprogram (S);
+      else
+         Append_Entity (S, Current_Scope);
+      end if;
+
       Set_Public_Status (S);
 
       if Debug_Flag_E then

gcc/ada/sem_dim.adb

@@ -1508,10 +1508,12 @@ package body Sem_Dim is
 
    begin
       --  Aspect is an Ada 2012 feature. Note that there is no need to check
-      --  dimensions for calls that don't come from source.
+      --  dimensions for calls that don't come from source, or those that may
+      --  have semantic errors.
 
       if Ada_Version < Ada_2012
         or else not Comes_From_Source (N)
+        or else Error_Posted (N)
       then
          return;
       end if;

gcc/ada/sem_res.adb

@@ -9624,6 +9624,13 @@ package body Sem_Res is
             then
                null;
 
+            --  Never warn on conversion to Long_Long_Integer'Base since
+            --  that is most likely an artifact of the extended overflow
+            --  checking and comes from complex expanded code.
+
+            elsif Orig_T = Base_Type (Standard_Long_Long_Integer) then
+               null;
+
             --  Here we give the redundant conversion warning. If it is an
             --  entity, give the name of the entity in the message. If not,
             --  just mention the expression.

gcc/ada/sem_util.adb

@@ -279,6 +279,63 @@ package body Sem_Util is
       return Alignment (E) * System_Storage_Unit;
    end Alignment_In_Bits;
 
+   ---------------------------------
+   -- Append_Inherited_Subprogram --
+   ---------------------------------
+
+   procedure Append_Inherited_Subprogram (S : Entity_Id) is
+      Par : constant Entity_Id := Alias (S);
+      --  The parent subprogram
+
+      Scop : constant Entity_Id := Scope (Par);
+      --  The scope of definition of the parent subprogram
+
+      Typ : constant Entity_Id := Defining_Entity (Parent (S));
+      --  The derived type of which S is a primitive operation
+
+      Decl   : Node_Id;
+      Next_E : Entity_Id;
+
+   begin
+      if Ekind (Current_Scope) = E_Package
+        and then In_Private_Part (Current_Scope)
+        and then Has_Private_Declaration (Typ)
+        and then Is_Tagged_Type (Typ)
+        and then Scop = Current_Scope
+      then
+         --  The inherited operation is available at the earliest place after
+         --  the derived type declaration ( RM 7.3.1 (6/1)). This is only
+         --  relevant for type extensions. If the parent operation appears
+         --  after the type extension, the operation is not visible.
+
+         Decl := First
+                   (Visible_Declarations
+                     (Specification (Unit_Declaration_Node (Current_Scope))));
+         while Present (Decl) loop
+            if Nkind (Decl) = N_Private_Extension_Declaration
+              and then Defining_Entity (Decl) = Typ
+            then
+               if Sloc (Decl) > Sloc (Par) then
+                  Next_E := Next_Entity (Par);
+                  Set_Next_Entity (Par, S);
+                  Set_Next_Entity (S, Next_E);
+                  return;
+
+               else
+                  exit;
+               end if;
+            end if;
+
+            Next (Decl);
+         end loop;
+      end if;
+
+      --  If partial view is not a type extension, or it appears before the
+      --  subprogram declaration, insert normally at end of entity list.
+
+      Append_Entity (S, Current_Scope);
+   end Append_Inherited_Subprogram;
+
    -----------------------------------------
    -- Apply_Compile_Time_Constraint_Error --
    -----------------------------------------

gcc/ada/sem_util.ads

@@ -63,6 +63,12 @@ package Sem_Util is
    --  Otherwise Uint_0 is returned, indicating that the alignment of the
    --  entity is not yet known to the compiler.
 
+   procedure Append_Inherited_Subprogram (S : Entity_Id);
+   --  If the parent of the operation is declared in the visible part of
+   --  the current scope, the inherited operation is visible even though the
+   --  derived type that inherits the operation may be completed in the private
+   --  part of the current package.
+
    procedure Apply_Compile_Time_Constraint_Error
      (N      : Node_Id;
       Msg    : String;