[multiple changes]

2016-06-14  Hristian Kirtchev  <kirtchev@adacore.com>

	* lib.adb: Minor reformatting.
	* sem_util.adb (Is_OK_Volatile_Context): Do
	include Address in the supported attributes.

2016-06-14  Hristian Kirtchev  <kirtchev@adacore.com>

	* exp_ch4.adb (Expand_N_Case_Expression):
	Code cleanup. Finalize any transient controlled
	objects on exit from a case expression alternative.
	(Expand_N_If_Expression): Code cleanup.
	(Process_Actions): Removed.
	(Process_If_Case_Statements): New routine.
	(Process_Transient_Object): Change the name of formal Rel_Node to
	N and update all occurrences. Update the comment on usage. When
	the type of the context is Boolean, the proper insertion point
	for the finalization call is after the last declaration.

2016-06-14  Ed Schonberg  <schonberg@adacore.com>

	* lib-xref.ads, lib-xref.adb (Has_Deferred_Reference): new
	predicate to determine whether an entity appears in a context
	for which a Deferred_Reference was created, because it is not
	possible to determine when reference is analyzed whether it
	appears in a context in which the entity is modified.
	* sem_ch5.adb (Analyze_Statement): Do not emit a useless warning
	on assignment for an entity that has a deferred_reference.

2016-06-14  Javier Miranda  <miranda@adacore.com>

	* sem_res.adb (Resolve_Actuals): Generate a reference to actuals that
	come from source. Previously the reference was generated only if the
	call comes from source but the call may be rewritten by the expander
	thus causing the notification of spurious warnings.

2016-06-14  Arnaud Charlet  <charlet@adacore.com>

	* gnat1drv.adb: Remove further references to AAMP.
	* checks.adb (Apply_Scalar_Range_Check): Take
	Check_Float_Overflow info account.
	* live.ads, live.adb Added subprogram headers and
	start-of-processing-for comments.
	* sem_ch12.adb (Instantiate_Package_Body): Do not suppress
	checks when instantiating runtime units in CodePeer mode.

From-SVN: r237432

gcc/ada/ChangeLog

+2016-06-14  Hristian Kirtchev  <kirtchev@adacore.com>
+
+	* lib.adb: Minor reformatting.
+	* sem_util.adb (Is_OK_Volatile_Context): Do
+	include Address in the supported attributes.
+
+2016-06-14  Hristian Kirtchev  <kirtchev@adacore.com>
+
+	* exp_ch4.adb (Expand_N_Case_Expression):
+	Code cleanup. Finalize any transient controlled
+	objects on exit from a case expression alternative.
+	(Expand_N_If_Expression): Code cleanup.
+	(Process_Actions): Removed.
+	(Process_If_Case_Statements): New routine.
+	(Process_Transient_Object): Change the name of formal Rel_Node to
+	N and update all occurrences. Update the comment on usage. When
+	the type of the context is Boolean, the proper insertion point
+	for the finalization call is after the last declaration.
+
+2016-06-14  Ed Schonberg  <schonberg@adacore.com>
+
+	* lib-xref.ads, lib-xref.adb (Has_Deferred_Reference): new
+	predicate to determine whether an entity appears in a context
+	for which a Deferred_Reference was created, because it is not
+	possible to determine when reference is analyzed whether it
+	appears in a context in which the entity is modified.
+	* sem_ch5.adb (Analyze_Statement): Do not emit a useless warning
+	on assignment for an entity that has a deferred_reference.
+
+2016-06-14  Javier Miranda  <miranda@adacore.com>
+
+	* sem_res.adb (Resolve_Actuals): Generate a reference to actuals that
+	come from source. Previously the reference was generated only if the
+	call comes from source but the call may be rewritten by the expander
+	thus causing the notification of spurious warnings.
+
+2016-06-14  Arnaud Charlet  <charlet@adacore.com>
+
+	* gnat1drv.adb: Remove further references to AAMP.
+	* checks.adb (Apply_Scalar_Range_Check): Take
+	Check_Float_Overflow info account.
+	* live.ads, live.adb Added subprogram headers and
+	start-of-processing-for comments.
+	* sem_ch12.adb (Instantiate_Package_Body): Do not suppress
+	checks when instantiating runtime units in CodePeer mode.
+
 2016-06-14  Arnaud Charlet  <charlet@adacore.com>
 
 	* exp_ch3.adb (Expand_N_Object_Declaration): Only consider

gcc/ada/checks.adb

@@ -3077,15 +3077,11 @@ package body Checks is
       --  Floating-point case
       --  In the floating-point case, we only do range checks if the type is
       --  constrained. We definitely do NOT want range checks for unconstrained
-      --  types, since we want to have infinities
+      --  types, since we want to have infinities, except when
+      --  Check_Float_Overflow is set.
 
       elsif Is_Floating_Point_Type (S_Typ) then
-
-      --  Normally, we only do range checks if the type is constrained. We do
-      --  NOT want range checks for unconstrained types, since we want to have
-      --  infinities.
-
-         if Is_Constrained (S_Typ) then
+         if Is_Constrained (S_Typ) or else Check_Float_Overflow then
             Enable_Range_Check (Expr);
          end if;
 

gcc/ada/gnat1drv.adb

@@ -634,11 +634,9 @@ procedure Gnat1drv is
       if Debug_Flag_Dot_LL then
          Back_End_Handles_Limited_Types := True;
 
-      --  If no debug flag, usage off for AAMP, SCIL cases
+      --  If no debug flag, usage off for SCIL cases
 
-      elsif AAMP_On_Target
-        or else Generate_SCIL
-      then
+      elsif Generate_SCIL then
          Back_End_Handles_Limited_Types := False;
 
       --  Otherwise normal gcc back end, for now still turn flag off by
@@ -667,20 +665,16 @@ procedure Gnat1drv is
          --  back end some day, it would not be true for this test, but it
          --  would be non-GCC, so this is a bit troublesome ???
 
-         Front_End_Inlining := AAMP_On_Target or Generate_C_Code;
+         Front_End_Inlining := Generate_C_Code;
       end if;
 
       --  Set back-end inlining indication
 
       Back_End_Inlining :=
 
-        --  No back-end inlining available on AAMP
-
-        not AAMP_On_Target
-
         --  No back-end inlining available on C generation
 
-        and then not Generate_C_Code
+        not Generate_C_Code
 
         --  No back-end inlining in GNATprove mode, since it just confuses
         --  the formal verification process.

gcc/ada/lib-xref.adb

@@ -1218,6 +1218,21 @@ package body Lib.Xref is
       return E;
    end Get_Key;
 
+   ----------------------------
+   -- Has_Deferred_Reference --
+   ----------------------------
+
+   function Has_Deferred_Reference (Ent : Entity_Id) return Boolean is
+   begin
+      for J in Deferred_References.First .. Deferred_References.Last loop
+         if Deferred_References.Table (J).E = Ent then
+            return True;
+         end if;
+      end loop;
+
+      return False;
+   end Has_Deferred_Reference;
+
    ----------
    -- Hash --
    ----------

gcc/ada/lib-xref.ads

@@ -613,6 +613,11 @@ package Lib.Xref is
    procedure Process_Deferred_References;
    --  This procedure is called from Frontend to process these table entries
 
+   function Has_Deferred_Reference (Ent : Entity_Id) return Boolean;
+   --  This function determines whether an entity has a pending reference, in
+   --  order to suppress premature warnings about useless assignments. See
+   --  comments in Analyze_Assignment in sem-ch5.adb.
+
    -----------------------------
    -- SPARK Xrefs Information --
    -----------------------------

gcc/ada/lib.adb

@@ -70,10 +70,12 @@ package body Lib is
      (S                : Source_Ptr;
       Unwind_Instances : Boolean;
       Unwind_Subunits  : Boolean) return Unit_Number_Type;
-   --  Common code for Get_Code_Unit (get unit of instantiation for
-   --  location) Get_Source_Unit (get unit of template for location) and
-   --  Get_Top_Level_Code_Unit (same as Get_Code_Unit but not stopping at
-   --  subunits).
+   --  Common processing for routines Get_Code_Unit, Get_Source_Unit, and
+   --  Get_Top_Level_Code_Unit. Unwind_Instances is True when the unit for the
+   --  top-level instantiation should be returned instead of the unit for the
+   --  template, in the case of an instantiation. Unwind_Subunits is True when
+   --  the corresponding top-level unit should be returned instead of a
+   --  subunit, in the case of a subunit.
 
    --------------------------------------------
    -- Access Functions for Unit Table Fields --
@@ -635,8 +637,11 @@ package body Lib is
 
    function Get_Code_Unit (S : Source_Ptr) return Unit_Number_Type is
    begin
-      return Get_Code_Or_Source_Unit (Top_Level_Location (S),
-        Unwind_Instances => False, Unwind_Subunits => False);
+      return
+        Get_Code_Or_Source_Unit
+          (Top_Level_Location (S),
+           Unwind_Instances => False,
+           Unwind_Subunits  => False);
    end Get_Code_Unit;
 
    function Get_Code_Unit (N : Node_Or_Entity_Id) return Unit_Number_Type is
@@ -652,7 +657,6 @@ package body Lib is
    begin
       if N <= Compilation_Switches.Last then
          return Compilation_Switches.Table (N);
-
       else
          return null;
       end if;
@@ -711,8 +715,9 @@ package body Lib is
 
    function Get_Source_Unit (S : Source_Ptr) return Unit_Number_Type is
    begin
-      return Get_Code_Or_Source_Unit (S,
-        Unwind_Instances => True, Unwind_Subunits => False);
+      return
+        Get_Code_Or_Source_Unit
+          (S, Unwind_Instances => True, Unwind_Subunits => False);
    end Get_Source_Unit;
 
    function Get_Source_Unit (N : Node_Or_Entity_Id) return Unit_Number_Type is
@@ -726,8 +731,11 @@ package body Lib is
 
    function Get_Top_Level_Code_Unit (S : Source_Ptr) return Unit_Number_Type is
    begin
-      return Get_Code_Or_Source_Unit (Top_Level_Location (S),
-        Unwind_Instances => False, Unwind_Subunits => True);
+      return
+        Get_Code_Or_Source_Unit
+          (Top_Level_Location (S),
+           Unwind_Instances => False,
+           Unwind_Subunits  => True);
    end Get_Top_Level_Code_Unit;
 
    function Get_Top_Level_Code_Unit

gcc/ada/live.adb

@@ -6,7 +6,7 @@
 --                                                                          --
 --                                 B o d y                                  --
 --                                                                          --
---          Copyright (C) 2000-2013, Free Software Foundation, Inc.         --
+--          Copyright (C) 2000-2016, 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- --
@@ -36,10 +36,10 @@ package body Live is
 
    --  Name_Set
 
-   --  The Name_Set type is used to store the temporary mark bits
-   --  used by the garbage collection of entities. Using a separate
-   --  array prevents using up any valuable per-node space and possibly
-   --  results in better locality and cache usage.
+   --  The Name_Set type is used to store the temporary mark bits used by the
+   --  garbage collection of entities. Using a separate array prevents using up
+   --  any valuable per-node space and possibly results in better locality and
+   --  cache usage.
 
    type Name_Set is array (Node_Id range <>) of Boolean;
    pragma Pack (Name_Set);
@@ -66,14 +66,13 @@ package body Live is
    --  The Mark phase is split into two phases:
 
    procedure Init_Marked (Root : Node_Id; Marks : out Name_Set);
-   --  For all subprograms, reset Is_Public flag if a pragma Eliminate
-   --  applies to the entity, and set the Marked flag to Is_Public
+   --  For all subprograms, reset Is_Public flag if a pragma Eliminate applies
+   --  to the entity, and set the Marked flag to Is_Public.
 
    procedure Trace_Marked (Root : Node_Id; Marks : in out Name_Set);
-   --  Traverse the tree skipping any unmarked subprogram bodies.
-   --  All visited entities are marked, as well as entities denoted
-   --  by a visited identifier or operator. When an entity is first
-   --  marked it is traced as well.
+   --  Traverse the tree skipping any unmarked subprogram bodies. All visited
+   --  entities are marked, as well as entities denoted by a visited identifier
+   --  or operator. When an entity is first marked it is traced as well.
 
    --  Local functions
 
@@ -137,6 +136,10 @@ package body Live is
       function Process (N : Node_Id) return Traverse_Result;
       procedure Traverse is new Traverse_Proc (Process);
 
+      -------------
+      -- Process --
+      -------------
+
       function Process (N : Node_Id) return Traverse_Result is
       begin
          case Nkind (N) is
@@ -233,6 +236,10 @@ package body Live is
       function Process (N : Node_Id) return Traverse_Result;
       procedure Traverse is new Traverse_Proc (Process);
 
+      -------------
+      -- Process --
+      -------------
+
       function Process (N : Node_Id) return Traverse_Result is
       begin
          case Nkind (N) is
@@ -263,6 +270,8 @@ package body Live is
          return OK;
       end Process;
 
+   --  Start of processing for Sweep
+
    begin
       Traverse (Root);
    end Sweep;
@@ -277,6 +286,10 @@ package body Live is
       procedure Process (N : Node_Id);
       procedure Traverse is new Traverse_Proc (Process);
 
+      -------------
+      -- Process --
+      -------------
+
       procedure Process (N : Node_Id) is
          Result : Traverse_Result;
          pragma Warnings (Off, Result);

gcc/ada/live.ads

@@ -6,7 +6,7 @@
 --                                                                          --
 --                                 S p e c                                  --
 --                                                                          --
---          Copyright (C) 2000-2008, Free Software Foundation, Inc.         --
+--          Copyright (C) 2000-2016, 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- --
@@ -23,14 +23,14 @@
 --                                                                          --
 ------------------------------------------------------------------------------
 
---  This package implements a compiler phase that determines the set
---  of live entities. For now entities are considered live when they
---  have at least one execution time reference.
+--  This package implements a compiler phase that determines the set of live
+--  entities. For now entities are considered live when they have at least one
+--  execution time reference.
 
 package Live is
 
    procedure Collect_Garbage_Entities;
-   --  Eliminate unreachable entities using a mark-and-sweep from
-   --  the set of root entities, i.e. those having Is_Public set.
+   --  Eliminate unreachable entities using a mark-and-sweep from the set of
+   --  root entities, i.e. those having Is_Public set.
 
 end Live;

gcc/ada/sem_ch12.adb

@@ -11001,7 +11001,11 @@ package body Sem_Ch12 is
             --  Note that we do NOT apply this criterion to children of GNAT
             --  The latter units must suppress checks explicitly if needed.
 
-            if Is_Predefined_File_Name
+            --  We also do not suppress checks in CodePeer mode where we are
+            --  interested in finding possible runtime errors.
+
+            if not CodePeer_Mode
+              and then Is_Predefined_File_Name
                          (Unit_File_Name (Get_Source_Unit (Gen_Decl)))
             then
                Analyze (Act_Body, Suppress => All_Checks);

gcc/ada/sem_ch5.adb

@@ -830,10 +830,24 @@ package body Sem_Ch5 is
                --  warnings when an assignment is rewritten as another
                --  assignment, and gets tied up with itself.
 
+               --  There may have been a previous reference to a component of
+               --  the variable, which in general removes the Last_Assignment
+               --  field of the variable to indicate a relevant use of the
+               --  previous assignment. However, if the assignment is to a
+               --  subcomponent the reference may not have registered, because
+               --  it is not possible to determine whether the context is an
+               --  assignment. In those cases we generate a Deferred_Reference,
+               --  to be used at the end of compilation to generate the right
+               --  kind of reference, and we suppress a potential warning for
+               --  a useless assignment, which might be premature. This may
+               --  lose a warning in rare cases, but seems preferable to a
+               --  misleading warning.
+
                if Warn_On_Modified_Unread
                  and then Is_Assignable (Ent)
                  and then Comes_From_Source (N)
                  and then In_Extended_Main_Source_Unit (Ent)
+                 and then not Has_Deferred_Reference (Ent)
                then
                   Warn_On_Useless_Assignment (Ent, N);
                end if;

gcc/ada/sem_res.adb

@@ -3704,7 +3704,7 @@ package body Sem_Res is
 
          if Present (A)
            and then Is_Entity_Name (A)
-           and then Comes_From_Source (N)
+           and then Comes_From_Source (A)
          then
             Orig_A := Entity (A);
 

gcc/ada/sem_util.adb

@@ -13643,7 +13643,8 @@ package body Sem_Util is
 
       elsif Nkind (Context) = N_Attribute_Reference
         and then Prefix (Context) = Obj_Ref
-        and then Nam_In (Attribute_Name (Context), Name_Alignment,
+        and then Nam_In (Attribute_Name (Context), Name_Address,
+                                                   Name_Alignment,
                                                    Name_Component_Size,
                                                    Name_First_Bit,
                                                    Name_Last_Bit,