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------------------------------------------------------------------------------

--                                                                          --

--                         GNAT COMPILER COMPONENTS                         --

--                                                                          --

--                              P A R _ S C O                               --

--                                                                          --

--                                 B o d y                                  --

--                                                                          --

--             Copyright (C) 2009, 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- --

-- ware  Foundation;  either version 3,  or (at your option) any later ver- --

-- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --

-- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --

-- or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License --

-- for  more details.  You should have  received  a copy of the GNU General --

-- Public License  distributed with GNAT; see file COPYING3.  If not, go to --

-- http://www.gnu.org/licenses for a complete copy of the license.          --

--                                                                          --

-- GNAT was originally developed  by the GNAT team at  New York University. --

-- Extensive contributions were provided by Ada Core Technologies Inc.      --

--                                                                          --

------------------------------------------------------------------------------

with Atree;    use Atree;

with Debug;    use Debug;

with Lib;      use Lib;

with Lib.Util; use Lib.Util;

with Namet;    use Namet;

with Nlists;   use Nlists;

with Opt;      use Opt;

with Output;   use Output;

with Put_SCOs;

with SCOs;     use SCOs;

with Sinfo;    use Sinfo;

with Sinput;   use Sinput;

with Snames;   use Snames;

with Table;

with GNAT.HTable;      use GNAT.HTable;

with GNAT.Heap_Sort_G;

package body Par_SCO is

   -----------------------

   -- Unit Number Table --

   -----------------------

   --  This table parallels the SCO_Unit_Table, keeping track of the unit

   --  numbers corresponding to the entries made in this table, so that before

   --  writing out the SCO information to the ALI file, we can fill in the

   --  proper dependency numbers and file names.

   --  Note that the zero'th entry is here for convenience in sorting the

   --  table, the real lower bound is 1.

   package SCO_Unit_Number_Table is new Table.Table (

     Table_Component_Type => Unit_Number_Type,

     Table_Index_Type     => SCO_Unit_Index,

     Table_Low_Bound      => 0, -- see note above on sort

     Table_Initial        => 20,

     Table_Increment      => 200,

     Table_Name           => "SCO_Unit_Number_Entry");

   --------------------------

   -- Condition Hash Table --

   --------------------------

   --  We need to be able to get to conditions quickly for handling the calls

   --  to Set_SCO_Condition efficiently. For this purpose we identify the

   --  conditions in the table by their starting sloc, and use the following

   --  hash table to map from these starting sloc values to SCO_Table indexes.

   type Header_Num is new Integer range 0 .. 996;

   --  Type for hash table headers

   function Hash (F : Source_Ptr) return Header_Num;

   --  Function to Hash source pointer value

   function Equal (F1, F2 : Source_Ptr) return Boolean;

   --  Function to test two keys for equality

   package Condition_Hash_Table is new Simple_HTable

     (Header_Num, Int, 0, Source_Ptr, Hash, Equal);

   --  The actual hash table

   --------------------------

   -- Internal Subprograms --

   --------------------------

   function Has_Decision (N : Node_Id) return Boolean;

   --  N is the node for a subexpression. Returns True if the subexpression

   --  contains a nested decision (i.e. either is a logical operator, or

   --  contains a logical operator in its subtree).

   function Is_Logical_Operator (N : Node_Id) return Boolean;

   --  N is the node for a subexpression. This procedure just tests N to see

   --  if it is a logical operator (including short circuit conditions, but

   --  excluding OR and AND) and returns True if so, False otherwise, it does

   --  no other processing.

   procedure Process_Decisions (N : Node_Id; T : Character);

   --  If N is Empty, has no effect. Otherwise scans the tree for the node N,

   --  to output any decisions it contains. T is one of IEPWX (for context of

   --  expresion: if/exit when/pragma/while/expression). If T is other than X,

   --  then a decision is always present (at the very least a simple decision

   --  is present at the top level).

   procedure Process_Decisions (L : List_Id; T : Character);

   --  Calls above procedure for each element of the list L

   procedure Set_Table_Entry

     (C1   : Character;

      C2   : Character;

      From : Source_Ptr;

      To   : Source_Ptr;

      Last : Boolean);

   --  Append an entry to SCO_Table with fields set as per arguments

   procedure Traverse_Declarations_Or_Statements  (L : List_Id);

   procedure Traverse_Generic_Package_Declaration (N : Node_Id);

   procedure Traverse_Handled_Statement_Sequence  (N : Node_Id);

   procedure Traverse_Package_Body                (N : Node_Id);

   procedure Traverse_Package_Declaration         (N : Node_Id);

   procedure Traverse_Subprogram_Body             (N : Node_Id);

   --  Traverse the corresponding construct, generating SCO table entries

   procedure Write_SCOs_To_ALI_File is new Put_SCOs;

   --  Write SCO information to the ALI file using routines in Lib.Util

   ----------

   -- dsco --

   ----------

   procedure dsco is

   begin

      --  Dump SCO unit table

      Write_Line ("SCO Unit Table");

      Write_Line ("--------------");

      for Index in 1 .. SCO_Unit_Table.Last loop

         declare

            UTE : SCO_Unit_Table_Entry renames SCO_Unit_Table.Table (Index);

         begin

            Write_Str ("  ");

            Write_Int (Int (Index));

            Write_Str (".  Dep_Num = ");

            Write_Int (Int (UTE.Dep_Num));

            Write_Str ("  From = ");

            Write_Int (Int (UTE.From));

            Write_Str ("  To = ");

            Write_Int (Int (UTE.To));

            Write_Str ("  File_Name = """);

            if UTE.File_Name /= null then

               Write_Str (UTE.File_Name.all);

            end if;

            Write_Char ('"');

            Write_Eol;

         end;

      end loop;

      --  Dump SCO Unit number table if it contains any entries

      if SCO_Unit_Number_Table.Last >= 1 then

         Write_Eol;

         Write_Line ("SCO Unit Number Table");

         Write_Line ("---------------------");

         for Index in 1 .. SCO_Unit_Number_Table.Last loop

            Write_Str ("  ");

            Write_Int (Int (Index));

            Write_Str (". Unit_Number = ");

            Write_Int (Int (SCO_Unit_Number_Table.Table (Index)));

            Write_Eol;

         end loop;

      end if;

      --  Dump SCO table itself

      Write_Eol;

      Write_Line ("SCO Table");

      Write_Line ("---------");

      for Index in 1 .. SCO_Table.Last loop

         declare

            T : SCO_Table_Entry renames SCO_Table.Table (Index);

         begin

            Write_Str  ("  ");

            Write_Int  (Index);

            Write_Char ('.');

            if T.C1 /= ' ' then

               Write_Str  ("  C1 = '");

               Write_Char (T.C1);

               Write_Char (''');

            end if;

            if T.C2 /= ' ' then

               Write_Str  ("  C2 = '");

               Write_Char (T.C2);

               Write_Char (''');

            end if;

            if T.From /= No_Source_Location then

               Write_Str ("  From = ");

               Write_Int (Int (T.From.Line));

               Write_Char (':');

               Write_Int (Int (T.From.Col));

            end if;

            if T.To /= No_Source_Location then

               Write_Str ("  To = ");

               Write_Int (Int (T.To.Line));

               Write_Char (':');

               Write_Int (Int (T.To.Col));

            end if;

            if T.Last then

               Write_Str ("  True");

            else

               Write_Str ("  False");

            end if;

            Write_Eol;

         end;

      end loop;

   end dsco;

   -----------

   -- Equal --

   -----------

   function Equal (F1, F2 : Source_Ptr) return Boolean is

   begin

      return F1 = F2;

   end Equal;

   ------------------

   -- Has_Decision --

   ------------------

   function Has_Decision (N : Node_Id) return Boolean is

      function Check_Node (N : Node_Id) return Traverse_Result;

      ----------------

      -- Check_Node --

      ----------------

      function Check_Node (N : Node_Id) return Traverse_Result is

      begin

         if Is_Logical_Operator (N) then

            return Abandon;

         else

            return OK;

         end if;

      end Check_Node;

      function Traverse is new Traverse_Func (Check_Node);

   --  Start of processing for Has_Decision

   begin

      return Traverse (N) = Abandon;

   end Has_Decision;

   ----------

   -- Hash --

   ----------

   function Hash (F : Source_Ptr) return Header_Num is

   begin

      return Header_Num (Nat (F) mod 997);

   end Hash;

   ----------------

   -- Initialize --

   ----------------

   procedure Initialize is

   begin

      SCO_Unit_Number_Table.Init;

      --  Set dummy 0'th entry in place for sort

      SCO_Unit_Number_Table.Increment_Last;

   end Initialize;

   -------------------------

   -- Is_Logical_Operator --

   -------------------------

   function Is_Logical_Operator (N : Node_Id) return Boolean is

   begin

      return Nkind_In (N, N_Op_Xor,

                          N_Op_Not,

                          N_And_Then,

                          N_Or_Else);

   end Is_Logical_Operator;

   -----------------------

   -- Process_Decisions --

   -----------------------

   --  Version taking a list

   procedure Process_Decisions (L : List_Id; T : Character) is

      N : Node_Id;

   begin

      if L /= No_List then

         N := First (L);

         while Present (N) loop

            Process_Decisions (N, T);

            Next (N);

         end loop;

      end if;

   end Process_Decisions;

   --  Version taking a node

   procedure Process_Decisions (N : Node_Id; T : Character) is

      function Process_Node (N : Node_Id) return Traverse_Result;

      --  Processes one node in the traversal, looking for logical operators,

      --  and if one is found, outputs the appropriate table entries.

      procedure Output_Decision_Operand (N : Node_Id);

      --  The node N is the top level logical operator of a decision, or it is

      --  one of the operands of a logical operator belonging to a single

      --  complex decision. This routine outputs the sequence of table entries

      --  corresponding to the node. Note that we do not process the sub-

      --  operands to look for further decisions, that processing is done in

      --  Process_Decision_Operand, because we can't get decisions mixed up in

      --  the global table. Call has no effect if N is Empty.

      procedure Output_Element (N : Node_Id; T : Character);

      --  Node N is an operand of a logical operator that is not itself a

      --  logical operator, or it is a simple decision. This routine outputs

      --  the table entry for the element, with C1 set to T (' ' for one of

      --  the elements of a complex decision, or 'I'/'W'/'E' for a simple

      --  decision (from an IF, WHILE, or EXIT WHEN). Last is set to False,

      --  and an entry is made in the condition hash table.

      procedure Process_Decision_Operand (N : Node_Id);

      --  This is called on node N, the top level node of a decision, or on one

      --  of its operands or suboperands after generating the full output for

      --  the complex decision. It process the suboperands of the decision

      --  looking for nested decisions.

      -----------------------------

      -- Output_Decision_Operand --

      -----------------------------

      procedure Output_Decision_Operand (N : Node_Id) is

         C : Character;

         L : Node_Id;

      begin

         if No (N) then

            return;

         --  Logical operator

         elsif Is_Logical_Operator (N) then

            if Nkind (N) = N_Op_Not then

               C := '!';

               L := Empty;

            else

               L := Left_Opnd (N);

               if Nkind (N) = N_Op_Xor then

                  C := '^';

               elsif Nkind_In (N, N_Op_Or, N_Or_Else) then

                  C := '|';

               else

                  C := '&';

               end if;

            end if;

            Set_Table_Entry (C, ' ', No_Location, No_Location, False);

            Output_Decision_Operand (L);

            Output_Decision_Operand (Right_Opnd (N));

         --  Not a logical operator

         else

            Output_Element (N, ' ');

         end if;

      end Output_Decision_Operand;

      --------------------

      -- Output_Element --

      --------------------

      procedure Output_Element (N : Node_Id; T : Character) is

         FSloc : Source_Ptr;

         LSloc : Source_Ptr;

      begin

         Sloc_Range (N, FSloc, LSloc);

         Set_Table_Entry (T, 'c', FSloc, LSloc, False);

         Condition_Hash_Table.Set (FSloc, SCO_Table.Last);

      end Output_Element;

      ------------------------------

      -- Process_Decision_Operand --

      ------------------------------

      procedure Process_Decision_Operand (N : Node_Id) is

      begin

         if Is_Logical_Operator (N) then

            if Nkind (N) /= N_Op_Not then

               Process_Decision_Operand (Left_Opnd (N));

            end if;

            Process_Decision_Operand (Right_Opnd (N));

         else

            Process_Decisions (N, 'X');

         end if;

      end Process_Decision_Operand;

      ------------------

      -- Process_Node --

      ------------------

      function Process_Node (N : Node_Id) return Traverse_Result is

      begin

         case Nkind (N) is

               --  Logical operators, output table entries and then process

               --  operands recursively to deal with nested conditions.

            when N_And_Then                    |

                 N_Or_Else                     |

                 N_Op_Not                      =>

               declare

                  T : Character;

               begin

                  --  If outer level, then type comes from call, otherwise it

                  --  is more deeply nested and counts as X for expression.

                  if N = Process_Decisions.N then

                     T := Process_Decisions.T;

                  else

                     T := 'X';

                  end if;

                  --  Output header for sequence

                  Set_Table_Entry (T, ' ', No_Location, No_Location, False);

                  --  Output the decision

                  Output_Decision_Operand (N);

                  --  Change Last in last table entry to True to mark end

                  SCO_Table.Table (SCO_Table.Last).Last := True;

                  --  Process any embedded decisions

                  Process_Decision_Operand (N);

                  return Skip;

               end;

            --  Conditional expression, processed like an if statement

            when N_Conditional_Expression      =>

               declare

                  Cond : constant Node_Id := First (Expressions (N));

                  Thnx : constant Node_Id := Next (Cond);

                  Elsx : constant Node_Id := Next (Thnx);

               begin

                  Process_Decisions (Cond, 'I');

                  Process_Decisions (Thnx, 'X');

                  Process_Decisions (Elsx, 'X');

                  return Skip;

               end;

            --  All other cases, continue scan

            when others =>

               return OK;

         end case;

      end Process_Node;

      procedure Traverse is new Traverse_Proc (Process_Node);

   --  Start of processing for Process_Decisions

   begin

      if No (N) then

         return;

      end if;

      --  See if we have simple decision at outer level and if so then

      --  generate the decision entry for this simple decision. A simple

      --  decision is a boolean expression (which is not a logical operator

      --  or short circuit form) appearing as the operand of an IF, WHILE

      --  or EXIT WHEN construct.

      if T /= 'X' and then not Is_Logical_Operator (N) then

         Output_Element (N, T);

         --  Change Last in last table entry to True to mark end of

         --  sequence, which is this case is only one element long.

         SCO_Table.Table (SCO_Table.Last).Last := True;

      end if;

      Traverse (N);

   end Process_Decisions;

   -----------

   -- pscos --

   -----------

   procedure pscos is

      procedure Write_Info_Char (C : Character) renames Write_Char;

      --  Write one character;

      procedure Write_Info_Initiate (Key : Character) renames Write_Char;

      --  Start new one and write one character;

      procedure Write_Info_Nat (N : Nat);

      --  Write value of N

      procedure Write_Info_Terminate renames Write_Eol;

      --  Terminate current line

      --------------------

      -- Write_Info_Nat --

      --------------------

      procedure Write_Info_Nat (N : Nat) is

      begin

         Write_Int (N);

      end Write_Info_Nat;

      procedure Debug_Put_SCOs is new Put_SCOs;

      --  Start of processing for pscos

   begin

      Debug_Put_SCOs;

   end pscos;

   ----------------

   -- SCO_Output --

   ----------------

   procedure SCO_Output is

   begin

      if Debug_Flag_Dot_OO then

         dsco;

      end if;

      --  Sort the unit tables based on dependency numbers

      Unit_Table_Sort : declare

         function Lt (Op1, Op2 : Natural) return Boolean;

         --  Comparison routine for sort call

         procedure Move (From : Natural; To : Natural);

         --  Move routine for sort call

         --------

         -- Lt --

         --------

         function Lt (Op1, Op2 : Natural) return Boolean is

         begin

            return

              Dependency_Num

                (SCO_Unit_Number_Table.Table (SCO_Unit_Index (Op1)))

                     <

              Dependency_Num

                (SCO_Unit_Number_Table.Table (SCO_Unit_Index (Op2)));

         end Lt;

         ----------

         -- Move --

         ----------

         procedure Move (From : Natural; To : Natural) is

         begin

            SCO_Unit_Table.Table (SCO_Unit_Index (To)) :=

              SCO_Unit_Table.Table (SCO_Unit_Index (From));

            SCO_Unit_Number_Table.Table (SCO_Unit_Index (To)) :=

              SCO_Unit_Number_Table.Table (SCO_Unit_Index (From));

         end Move;

         package Sorting is new GNAT.Heap_Sort_G (Move, Lt);

      --  Start of processing for Unit_Table_Sort

      begin

         Sorting.Sort (Integer (SCO_Unit_Table.Last));

      end Unit_Table_Sort;

      --  Loop through entries in the unit table to set file name and

      --  dependency number entries.

      for J in 1 .. SCO_Unit_Table.Last loop

         declare

            U   : constant Unit_Number_Type := SCO_Unit_Number_Table.Table (J);

            UTE : SCO_Unit_Table_Entry renames SCO_Unit_Table.Table (J);

         begin

            Get_Name_String (Reference_Name (Source_Index (U)));

            UTE.File_Name := new String'(Name_Buffer (1 .. Name_Len));

            UTE.Dep_Num := Dependency_Num (U);

         end;

      end loop;

      --  Now the tables are all setup for output to the ALI file

      Write_SCOs_To_ALI_File;

   end SCO_Output;

   ----------------

   -- SCO_Record --

   ----------------

   procedure SCO_Record (U : Unit_Number_Type) is

      Lu   : Node_Id;

      From : Nat;

   begin

      --  Ignore call if not generating code and generating SCO's

      if not (Generate_SCO and then Operating_Mode = Generate_Code) then

         return;

      end if;

      --  Ignore call if this unit already recorded

      for J in 1 .. SCO_Unit_Number_Table.Last loop

         if U = SCO_Unit_Number_Table.Table (J) then

            return;

         end if;

      end loop;

      --  Otherwise record starting entry

      From := SCO_Table.Last + 1;

      --  Get Unit (checking case of subunit)

      Lu := Unit (Cunit (U));

      if Nkind (Lu) = N_Subunit then

         Lu := Proper_Body (Lu);

      end if;

      --  Traverse the unit

      if Nkind (Lu) = N_Subprogram_Body then

         Traverse_Subprogram_Body (Lu);

      elsif Nkind (Lu) = N_Package_Declaration then

         Traverse_Package_Declaration (Lu);

      elsif Nkind (Lu) = N_Package_Body then

         Traverse_Package_Body (Lu);

      elsif Nkind (Lu) = N_Generic_Package_Declaration then

         Traverse_Generic_Package_Declaration (Lu);

      --  For anything else, the only issue is default expressions for

      --  parameters, where we have to worry about possible embedded decisions

      --  but nothing else.

      else

         Process_Decisions (Lu, 'X');

      end if;

      --  Make entry for new unit in unit tables, we will fill in the file

      --  name and dependency numbers later.

      SCO_Unit_Table.Append (

        (Dep_Num   => 0,

         File_Name => null,

         From      => From,

         To        => SCO_Table.Last));

      SCO_Unit_Number_Table.Append (U);

   end SCO_Record;

   -----------------------

   -- Set_SCO_Condition --

   -----------------------

   procedure Set_SCO_Condition (First_Loc : Source_Ptr; Typ : Character) is

      Index : constant Nat := Condition_Hash_Table.Get (First_Loc);

   begin

      if Index /= 0 then

         SCO_Table.Table (Index).C2 := Typ;

      end if;

   end Set_SCO_Condition;

   ---------------------

   -- Set_Table_Entry --

   ---------------------

   procedure Set_Table_Entry

     (C1   : Character;

      C2   : Character;

      From : Source_Ptr;

      To   : Source_Ptr;

      Last : Boolean)

   is

      function To_Source_Location (S : Source_Ptr) return Source_Location;

      --  Converts Source_Ptr value to Source_Location (line/col) format

      ------------------------

      -- To_Source_Location --

      ------------------------

      function To_Source_Location (S : Source_Ptr) return Source_Location is

      begin

         if S = No_Location then

            return No_Source_Location;

         else

            return

              (Line => Get_Logical_Line_Number (S),

               Col  => Get_Column_Number (S));

         end if;

      end To_Source_Location;

   --  Start of processing for Set_Table_Entry

   begin

      Add_SCO

        (C1   => C1,

         C2   => C2,

         From => To_Source_Location (From),

         To   => To_Source_Location (To),

         Last => Last);

   end Set_Table_Entry;

   -----------------------------------------

   -- Traverse_Declarations_Or_Statements --

   -----------------------------------------

   procedure Traverse_Declarations_Or_Statements (L : List_Id) is

      N     : Node_Id;

      Dummy : Source_Ptr;

      type SC_Entry is record

         From : Source_Ptr;

         To   : Source_Ptr;

         Typ  : Character;

      end record;

      --  Used to store a single entry in the following array

      SC_Array : array (Nat range 1 .. 10_000) of SC_Entry;

      SC_Last  : Nat;

      --  Used to store statement components for a CS entry to be output

      --  as a result of the call to this procedure. SC_Last is the last

      --  entry stored, so the current statement sequence is represented

      --  by SC_Array (1 .. SC_Last). Extend_Statement_Sequence adds an

      --  entry to this array, and Set_Statement_Entry clears it, copying

      --  the entries to the main SCO output table. The reason that we do

      --  the temporary caching of results in this array is that we want

      --  the SCO table entries for a given CS line to be contiguous, and