s-rident.ads: Add No_Default_Initialization restriction

2008-04-08  Robert Dewar  <dewar@adacore.com>
	    Gary Dismukes  <dismukes@adacore.com>

	* s-rident.ads: Add No_Default_Initialization restriction

	* exp_tss.adb: 
	(Has_Non_Null_Base_Init_Proc): Handle No_Default_Initialization case
	(Set_TSS): Handle No_Default_Initialization case

	* exp_ch6.adb (Expand_N_Subprogram_Body): Handle restriction
	No_Default_Initialization
	(Expand_N_Subprogram_Body): Remove redundant initialization of out
	parameters when Normalize_Scalars is active.
	(Add_Final_List_Actual_To_Build_In_Place_Call): Add formal Sel_Comp
	Fix casing error in formal parameter name in call
	(Register_Predefined_DT_Entry): Replace occurrences of RE_Address by
	(Expand_Call, Propagate_Tag): Call Kill_Current_Values when processing a
	dispatching call on VM targets.

From-SVN: r134028

gcc/ada/exp_tss.adb

@@ -6,7 +6,7 @@
 --                                                                          --
 --                                 B o d y                                  --
 --                                                                          --
---          Copyright (C) 1992-2007, Free Software Foundation, Inc.         --
+--          Copyright (C) 1992-2008, Free Software Foundation, Inc.         --
 --                                                                          --
 -- GNAT is free software;  you can  redistribute it  and/or modify it under --
 -- terms of the  GNU General Public License as published  by the Free Soft- --
@@ -28,6 +28,8 @@ with Einfo;    use Einfo;
 with Elists;   use Elists;
 with Exp_Util; use Exp_Util;
 with Lib;      use Lib;
+with Restrict; use Restrict;
+with Rident;   use Rident;
 with Sem_Util; use Sem_Util;
 with Sinfo;    use Sinfo;
 
@@ -159,11 +161,16 @@ package body Exp_Tss is
    -- Has_Non_Null_Base_Init_Proc --
    ---------------------------------
 
+   --  Note: if a base Init_Proc is present, and No_Default_Initialization is
+   --  present, then we must avoid testing for a null init proc, since there
+   --  is no init proc present in this case.
+
    function Has_Non_Null_Base_Init_Proc (Typ : Entity_Id) return Boolean is
       BIP : constant Entity_Id := Base_Init_Proc (Typ);
-
    begin
-      return Present (BIP) and then not Is_Null_Init_Proc (BIP);
+      return Present (BIP)
+        and then (Restriction_Active (No_Default_Initialization)
+                    or else not Is_Null_Init_Proc (BIP));
    end Has_Non_Null_Base_Init_Proc;
 
    ---------------
@@ -306,20 +313,31 @@ package body Exp_Tss is
    -------------
 
    procedure Set_TSS (Typ : Entity_Id; TSS : Entity_Id) is
-      Subprog_Body : constant Node_Id := Unit_Declaration_Node (TSS);
-
    begin
-      --  Case of insertion location is in unit defining the type
+      --  Make sure body of subprogram is frozen
 
-      if In_Same_Code_Unit (Typ, TSS) then
-         Append_Freeze_Action (Typ, Subprog_Body);
+      --  Skip this for Init_Proc with No_Default_Initialization, since the
+      --  Init proc is a dummy void entity in this case to be ignored.
 
-      --  Otherwise, we are using an already existing TSS in another unit
+      if Is_Init_Proc (TSS)
+        and then Restriction_Active (No_Default_Initialization)
+      then
+         null;
 
-      else
+      --  Skip this if not in the same code unit (since it means we are using
+      --  an already existing TSS in another unit)
+
+      elsif not In_Same_Code_Unit (Typ, TSS) then
          null;
+
+      --  Otherwise make sure body is frozen
+
+      else
+         Append_Freeze_Action (Typ, Unit_Declaration_Node (TSS));
       end if;
 
+      --  Set TSS entry
+
       Copy_TSS (TSS, Typ);
    end Set_TSS;
 

gcc/ada/s-rident.ads

@@ -6,7 +6,7 @@
 --                                                                          --
 --                                 S p e c                                  --
 --                                                                          --
---          Copyright (C) 1992-2006, Free Software Foundation, Inc.          --
+--          Copyright (C) 1992-2008, Free Software Foundation, Inc.         --
 --                                                                          --
 -- GNAT is free software;  you can  redistribute it  and/or modify it under --
 -- terms of the  GNU General Public License as published  by the Free Soft- --
@@ -56,7 +56,9 @@ package System.Rident is
 
    type Restriction_Id is
 
-      --  The following cases are checked for consistency in the binder
+      --  The following cases are checked for consistency in the binder. The
+      --  binder will check that every unit either has the restriction set, or
+      --  does not violate the restriction.
 
      (Simple_Barriers,                         -- GNAT (Ravenscar)
       No_Abort_Statements,                     -- (RM D.7(5), H.4(3))
@@ -111,7 +113,12 @@ package System.Rident is
       Static_Priorities,                       -- GNAT
       Static_Storage_Size,                     -- GNAT
 
-      --  The following cases do not require partition-wide checks
+      --  The following require consistency checking with special rules. See
+      --  individual routines in unit Bcheck for details of what is required.
+
+      No_Default_Initialization,               -- GNAT
+
+      --  The following cases do not require consistency checking
 
       Immediate_Reclamation,                   -- (RM H.4(10))
       No_Implementation_Attributes,            -- Ada 2005 AI-257
@@ -123,29 +130,28 @@ package System.Rident is
 
       --  The following cases require a parameter value
 
-      --  The following entries are fully checked at compile/bind time,
-      --  which means that the compiler can in general tell the minimum
-      --  value which could be used with a restrictions pragma. The binder
-      --  can deduce the appropriate minimum value for the partition by
-      --  taking the maximum value required by any unit.
+      --  The following entries are fully checked at compile/bind time, which
+      --  means that the compiler can in general tell the minimum value which
+      --  could be used with a restrictions pragma. The binder can deduce the
+      --  appropriate minimum value for the partition by taking the maximum
+      --  value required by any unit.
 
       Max_Protected_Entries,                   -- (RM D.7(14))
       Max_Select_Alternatives,                 -- (RM D.7(12))
       Max_Task_Entries,                        -- (RM D.7(13), H.4(3))
 
-      --  The following entries are also fully checked at compile/bind
-      --  time, and the compiler can also at least in some cases tell
-      --  the minimum value which could be used with a restriction pragma.
-      --  The difference is that the contributions are additive, so the
-      --  binder deduces this value by adding the unit contributions.
+      --  The following entries are also fully checked at compile/bind time,
+      --  and the compiler can also at least in some cases tell the minimum
+      --  value which could be used with a restriction pragma. The difference
+      --  is that the contributions are additive, so the binder deduces this
+      --  value by adding the unit contributions.
 
       Max_Tasks,                               -- (RM D.7(19), H.4(3))
 
-      --  The following entries are checked at compile time only for
-      --  zero/nonzero entries. This means that the compiler can tell
-      --  at compile time if a restriction value of zero is (would be)
-      --  violated, but that is all. The compiler cannot distinguish
-      --  between different non-zero values.
+      --  The following entries are checked at compile time only for zero/
+      --  nonzero entries. This means that the compiler can tell at compile
+      --  time if a restriction value of zero is (would be) violated, but that
+      --  the compiler cannot distinguish between different non-zero values.
 
       Max_Asynchronous_Select_Nesting,         -- (RM D.7(18), H.4(3))
       Max_Entry_Queue_Length,                  -- GNAT
@@ -237,9 +243,9 @@ package System.Rident is
    -- Restriction Status Declarations --
    -------------------------------------
 
-   --  The following declarations are used to record the current status
-   --  or restrictions (for the current unit, or related units, at compile
-   --  time, and for all units in a partition at bind time or run time).
+   --  The following declarations are used to record the current status or
+   --  restrictions (for the current unit, or related units, at compile time,
+   --  and for all units in a partition at bind time or run time).
 
    type Restriction_Flags  is array (All_Restrictions)           of Boolean;
    type Restriction_Values is array (All_Parameter_Restrictions) of Natural;
@@ -247,11 +253,10 @@ package System.Rident is
 
    type Restrictions_Info is record
       Set : Restriction_Flags;
-      --  An entry is True in the Set array if a restrictions pragma has
-      --  been encountered for the given restriction. If the value is
-      --  True for a parameter restriction, then the corresponding entry
-      --  in the Value array gives the minimum value encountered for any
-      --  such restriction.
+      --  An entry is True in the Set array if a restrictions pragma has been
+      --  encountered for the given restriction. If the value is True for a
+      --  parameter restriction, then the corresponding entry in the Value
+      --  array gives the minimum value encountered for any such restriction.
 
       Value : Restriction_Values;
       --  If the entry for a parameter restriction in Set is True (i.e. a
@@ -261,23 +266,23 @@ package System.Rident is
       --  pragma specifying a value greater than Int'Last is simply ignored.
 
       Violated : Restriction_Flags;
-      --  An entry is True in the violations array if the compiler has
-      --  detected a violation of the restriction. For a parameter
-      --  restriction, the Count and Unknown arrays have additional
-      --  information.
+      --  An entry is True in the violations array if the compiler has detected
+      --  a violation of the restriction. For a parameter restriction, the
+      --  Count and Unknown arrays have additional information.
 
       Count : Restriction_Values;
-      --  If an entry for a parameter restriction is True in Violated,
-      --  the corresponding entry in the Count array may record additional
+      --  If an entry for a parameter restriction is True in Violated, the
+      --  corresponding entry in the Count array may record additional
       --  information. If the actual minimum count is known (by taking
       --  maximums, or sums, depending on the restriction), it will be
       --  recorded in this array. If not, then the value will remain zero.
+      --  The value is also zero for a non-violated restriction.
 
       Unknown : Parameter_Flags;
-      --  If an entry for a parameter restriction is True in Violated,
-      --  the corresponding entry in the Unknown array may record additional
+      --  If an entry for a parameter restriction is True in Violated, the
+      --  corresponding entry in the Unknown array may record additional
       --  information. If the actual count is not known by the compiler (but
-      --  is known to be non-zero), then the entry in Unknown will be True.
+      --  is nown to be non-zero), then the entry in Unknown will be True.
       --  This indicates that the value in Count is not known to be exact,
       --  and the actual violation count may be higher.