[multiple changes]

2010-09-10  Robert Dewar  <dewar@adacore.com>

	* sem_ch4.adb: Minor reformatting.
	* exp_ch6.adb: Add comment on testing limited on full type
	* gnat_rm.texi: Add documentation on Pure_Function.

2010-09-10  Vincent Celier  <celier@adacore.com>

	* prj-nmsc.adb (Add_Source): Allow an Ada source to have the same name
	as a source of another project and of another language.

2010-09-10  Robert Dewar  <dewar@adacore.com>

	* exp_ch3.adb (Expand_N_Object_Declaration): Defend against previous
	errors.
	* freeze.adb (Check_Unsigned_Type): Ditto.
	* sem_aggr.adb (Resolve_Aggr_Expr): Ditto.
	* sem_ch3.adb (Convert_Scalar_Bounds): Ditto.
	(Set_Scalar_Range_For_Subtype): Ditto.
	* sem_eval.adb (Subtypes_Statically_Match): Ditto.

From-SVN: r164170

gcc/ada/ChangeLog

@@ -1,3 +1,24 @@
+2010-09-10  Robert Dewar  <dewar@adacore.com>
+
+	* sem_ch4.adb: Minor reformatting.
+	* exp_ch6.adb: Add comment on testing limited on full type
+	* gnat_rm.texi: Add documentation on Pure_Function.
+
+2010-09-10  Vincent Celier  <celier@adacore.com>
+
+	* prj-nmsc.adb (Add_Source): Allow an Ada source to have the same name
+	as a source of another project and of another language.
+
+2010-09-10  Robert Dewar  <dewar@adacore.com>
+
+	* exp_ch3.adb (Expand_N_Object_Declaration): Defend against previous
+	errors.
+	* freeze.adb (Check_Unsigned_Type): Ditto.
+	* sem_aggr.adb (Resolve_Aggr_Expr): Ditto.
+	* sem_ch3.adb (Convert_Scalar_Bounds): Ditto.
+	(Set_Scalar_Range_For_Subtype): Ditto.
+	* sem_eval.adb (Subtypes_Statically_Match): Ditto.
+
 2010-09-10  Robert Dewar  <dewar@adacore.com>
 
 	* repinfo.adb (List_Type_Info): List Small and Range for fixed-point

gcc/ada/exp_ch3.adb

@@ -4994,7 +4994,10 @@ package body Exp_Ch3 is
                  and then No_Initialization (Expr)
                then
                   null;
-               else
+
+               --  Otherwise apply a constraint check now if no prev error
+
+               elsif Nkind (Expr) /= N_Error then
                   Apply_Constraint_Check (Expr, Typ);
 
                   --  If the expression has been marked as requiring a range

gcc/ada/exp_ch6.adb

@@ -4096,7 +4096,8 @@ package body Exp_Ch6 is
    --  Initialize scalar out parameters if Initialize/Normalize_Scalars
 
    --  Reset Pure indication if any parameter has root type System.Address
-   --  or has any parameters of limited types.
+   --  or has any parameters of limited types, where limited means that the
+   --  run-time view is limited (i.e. the full type is limited).
 
    --  Wrap thread body
 
@@ -4289,6 +4290,11 @@ package body Exp_Ch6 is
             F := First_Formal (Spec_Id);
             while Present (F) loop
                if Is_Descendent_Of_Address (Etype (F))
+
+                 --  Note that this test is being made in the body of the
+                 --  subprogram, not the spec, so we are testing the full
+                 --  type for being limited here, as required.
+
                  or else Is_Limited_Type (Etype (F))
                then
                   Set_Is_Pure (Spec_Id, False);

gcc/ada/freeze.adb

@@ -1089,7 +1089,9 @@ package body Freeze is
 
       --  Do not attempt to analyze case where range was in error
 
-      if Error_Posted (Scalar_Range (E)) then
+      if No (Scalar_Range (E))
+        or else Error_Posted (Scalar_Range (E))
+      then
          return;
       end if;
 

gcc/ada/gnat_rm.texi

@@ -4369,6 +4369,14 @@ modifies a global variable (the count).  Memo functions are another
 example (where a table of previous calls is kept and consulted to
 avoid re-computation).
 
+Note also that the normal rules excluding optimization of subprograms
+in pure units (when parameter types are descended from System.Address,
+or when the full view of a parameter type is limited), do not apply
+for the Pure_Function case. If you explicitly specify Pure_Function,
+the compiler may optimize away calls with identical arguments, and
+if that results in unexpected behavior, the proper action is not to
+use the pragma for subprograms that are not (conceptually) pure.
+
 @findex Pure
 Note: Most functions in a @code{Pure} package are automatically pure, and
 there is no need to use pragma @code{Pure_Function} for such functions.  One

gcc/ada/prj-nmsc.adb

@@ -685,6 +685,7 @@ package body Prj.Nmsc is
             end if;
 
          elsif Prev_Unit /= No_Unit_Index
+           and then Prev_Unit.File_Names (Kind) /= null
            and then not Source.Locally_Removed
          then
             --  Path is set if this is a source we found on the disk, in which

gcc/ada/sem_aggr.adb

@@ -1411,6 +1411,14 @@ package body Sem_Aggr is
          --  Set to False if resolution of the expression failed
 
       begin
+         --  Defend against previous errors
+
+         if Nkind (Expr) = N_Error
+           or else Error_Posted (Expr)
+         then
+            return True;
+         end if;
+
          --  If the array type against which we are resolving the aggregate
          --  has several dimensions, the expressions nested inside the
          --  aggregate must be further aggregates (or strings).

gcc/ada/sem_ch3.adb

@@ -11252,6 +11252,12 @@ package body Sem_Ch3 is
       Rng : Node_Id;
 
    begin
+      --  Defend against previous errors
+
+      if No (Scalar_Range (Derived_Type)) then
+         return;
+      end if;
+
       Lo := Build_Scalar_Bound
               (Type_Low_Bound (Derived_Type),
                Parent_Type, Implicit_Base);
@@ -18294,6 +18300,12 @@ package body Sem_Ch3 is
       Kind : constant Entity_Kind :=  Ekind (Def_Id);
 
    begin
+      --  Defend against previous error
+
+      if Nkind (R) = N_Error then
+         return;
+      end if;
+
       Set_Scalar_Range (Def_Id, R);
 
       --  We need to link the range into the tree before resolving it so

gcc/ada/sem_ch4.adb

@@ -6413,11 +6413,11 @@ package body Sem_Ch4 is
          else
             Analyze (Node_To_Replace);
 
-            --  If the operation has been rewritten into a call, which may
-            --  get subsequently an explicit dereference, preserve the
-            --  type on the original node (selected component or indexed
-            --  component) for subsequent legality tests, e.g. Is_Variable.
-            --  which examines the original node.
+            --  If the operation has been rewritten into a call, which may get
+            --  subsequently an explicit dereference, preserve the type on the
+            --  original node (selected component or indexed component) for
+            --  subsequent legality tests, e.g. Is_Variable. which examines
+            --  the original node.
 
             if Nkind (Node_To_Replace) = N_Function_Call then
                Set_Etype
@@ -6534,7 +6534,6 @@ package body Sem_Ch4 is
            and then N = Prefix (Parent_Node)
          then
             Node_To_Replace := Parent_Node;
-
             Actuals := Expressions (Parent_Node);
 
             Actual := First (Actuals);

gcc/ada/sem_eval.adb

@@ -4680,9 +4680,9 @@ package body Sem_Eval is
          --  If there was an error in either range, then just assume the types
          --  statically match to avoid further junk errors.
 
-         if Error_Posted (Scalar_Range (T1))
-              or else
-            Error_Posted (Scalar_Range (T2))
+         if No (Scalar_Range (T1)) or else No (Scalar_Range (T2))
+           or else Error_Posted (Scalar_Range (T1))
+           or else Error_Posted (Scalar_Range (T2))
          then
             return True;
          end if;