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Diffstat (limited to 'gcc/ada/symbols-vms.adb')
| -rw-r--r-- | gcc/ada/symbols-vms.adb | 743 |
1 files changed, 743 insertions, 0 deletions
diff --git a/gcc/ada/symbols-vms.adb b/gcc/ada/symbols-vms.adb new file mode 100644 index 00000000000..c623e42b383 --- /dev/null +++ b/gcc/ada/symbols-vms.adb @@ -0,0 +1,743 @@ +------------------------------------------------------------------------------ +-- -- +-- GNAT COMPILER COMPONENTS -- +-- -- +-- S Y M B O L S -- +-- -- +-- B o d y -- +-- -- +-- Copyright (C) 2003 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 2, 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 COPYING. If not, write -- +-- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, -- +-- MA 02111-1307, USA. -- +-- -- +-- GNAT was originally developed by the GNAT team at New York University. -- +-- Extensive contributions were provided by Ada Core Technologies Inc. -- +-- -- +------------------------------------------------------------------------------ + +-- This is the VMS version of this package + +with Ada.Exceptions; use Ada.Exceptions; +with Ada.Sequential_IO; +with Ada.Text_IO; use Ada.Text_IO; + +package body Symbols is + + Case_Sensitive : constant String := "case_sensitive="; + Symbol_Vector : constant String := "SYMBOL_VECTOR=("; + Equal_Data : constant String := "=DATA)"; + Equal_Procedure : constant String := "=PROCEDURE)"; + Gsmatch : constant String := "gsmatch=equal,"; + + Symbol_File_Name : String_Access := null; + -- Name of the symbol file + + Sym_Policy : Policy := Autonomous; + -- The symbol policy. Set by Initialize + + Major_ID : Integer := 1; + -- The Major ID. May be modified by Initialize if Library_Version is + -- specified or if it is read from the reference symbol file. + + Soft_Major_ID : Boolean := True; + -- False if library version is specified in procedure Initialize. + -- When True, Major_ID may be modified if found in the reference symbol + -- file. + + Minor_ID : Natural := 0; + -- The Minor ID. May be modified if read from the reference symbol file + + Soft_Minor_ID : Boolean := True; + -- False if symbol policy is Autonomous, if library version is specified + -- in procedure Initialize and is not the same as the major ID read from + -- the reference symbol file. When True, Minor_ID may be increased in + -- Compliant symbol policy. + + subtype Byte is Character; + -- Object files are stream of bytes, but some of these bytes, those for + -- the names of the symbols, are ASCII characters. + + package Byte_IO is new Ada.Sequential_IO (Byte); + use Byte_IO; + + type Number is mod 2**16; + -- 16 bits unsigned number for number of characters + + GSD : constant Number := 10; + -- Code for the Global Symbol Definition section + + C_SYM : constant Number := 1; + -- Code for a Symbol subsection + + V_DEF_Mask : constant Number := 2**1; + V_NORM_Mask : constant Number := 2**6; + + File : Byte_IO.File_Type; + -- Each object file is read as a stream of bytes (characters) + + B : Byte; + + Number_Of_Characters : Natural := 0; + -- The number of characters of each section + + -- The following variables are used by procedure Process when reading an + -- object file. + + Code : Number := 0; + Length : Natural := 0; + + Dummy : Number; + + Nchars : Natural := 0; + Flags : Number := 0; + + Symbol : String (1 .. 255); + LSymb : Natural; + + function Equal (Left, Right : Symbol_Data) return Boolean; + -- Test for equality of symbols + + procedure Get (N : out Number); + -- Read two bytes from the object file LSB first as unsigned 16 bit number + + procedure Get (N : out Natural); + -- Read two bytes from the object file, LSByte first, as a Natural + + + function Image (N : Integer) return String; + -- Returns the image of N, without the initial space + + ----------- + -- Equal -- + ----------- + + function Equal (Left, Right : Symbol_Data) return Boolean is + begin + return Left.Name /= null and then + Right.Name /= null and then + Left.Name.all = Right.Name.all and then + Left.Kind = Right.Kind and then + Left.Present = Right.Present; + end Equal; + + --------- + -- Get -- + --------- + + procedure Get (N : out Number) is + C : Byte; + LSByte : Number; + begin + Read (File, C); + LSByte := Byte'Pos (C); + Read (File, C); + N := LSByte + (256 * Byte'Pos (C)); + end Get; + + procedure Get (N : out Natural) is + Result : Number; + begin + Get (Result); + N := Natural (Result); + end Get; + + ----------- + -- Image -- + ----------- + + function Image (N : Integer) return String is + Result : constant String := N'Img; + begin + if Result (Result'First) = ' ' then + return Result (Result'First + 1 .. Result'Last); + + else + return Result; + end if; + end Image; + + ---------------- + -- Initialize -- + ---------------- + + procedure Initialize + (Symbol_File : String; + Reference : String; + Symbol_Policy : Policy; + Quiet : Boolean; + Version : String; + Success : out Boolean) + is + File : Ada.Text_IO.File_Type; + Line : String (1 .. 1_000); + Last : Natural; + + begin + -- Record the symbol file name + + Symbol_File_Name := new String'(Symbol_File); + + -- Record the policy + + Sym_Policy := Symbol_Policy; + + -- Record the version (Major ID) + + if Version = "" then + Major_ID := 1; + Soft_Major_ID := True; + + else + begin + Major_ID := Integer'Value (Version); + Soft_Major_ID := False; + + if Major_ID <= 0 then + raise Constraint_Error; + end if; + + exception + when Constraint_Error => + if not Quiet then + Put_Line ("Version """ & Version & """ is illegal."); + Put_Line ("On VMS, version must be a positive number"); + end if; + + Success := False; + return; + end; + end if; + + Minor_ID := 0; + Soft_Minor_ID := Sym_Policy /= Autonomous; + + -- Empty the symbol tables + + Symbol_Table.Set_Last (Original_Symbols, 0); + Symbol_Table.Set_Last (Complete_Symbols, 0); + + -- Assume that everything will be fine + + Success := True; + + -- If policy is not autonomous, attempt to read the reference file + + if Sym_Policy /= Autonomous then + begin + Open (File, In_File, Reference); + + exception + when Ada.Text_IO.Name_Error => + return; + + when X : others => + if not Quiet then + Put_Line ("could not open """ & Reference & """"); + Put_Line (Exception_Message (X)); + end if; + + Success := False; + return; + end; + + -- Read line by line + + while not End_Of_File (File) loop + Get_Line (File, Line, Last); + + -- Ignore empty lines + + if Last = 0 then + null; + + -- Ignore lines starting with "case_sensitive=" + + elsif Last > Case_Sensitive'Length + and then Line (1 .. Case_Sensitive'Length) = Case_Sensitive + then + null; + + -- Line starting with "SYMBOL_VECTOR=(" + + elsif Last > Symbol_Vector'Length + and then Line (1 .. Symbol_Vector'Length) = Symbol_Vector + then + + -- SYMBOL_VECTOR=(<symbol>=DATA) + + if Last > Symbol_Vector'Length + Equal_Data'Length and then + Line (Last - Equal_Data'Length + 1 .. Last) = Equal_Data + then + Symbol_Table.Increment_Last (Original_Symbols); + Original_Symbols.Table + (Symbol_Table.Last (Original_Symbols)) := + (Name => + new String'(Line (Symbol_Vector'Length + 1 .. + Last - Equal_Data'Length)), + Kind => Data, + Present => True); + + -- SYMBOL_VECTOR=(<symbol>=PROCEDURE) + + elsif Last > Symbol_Vector'Length + Equal_Procedure'Length + and then + Line (Last - Equal_Procedure'Length + 1 .. Last) = + Equal_Procedure + then + Symbol_Table.Increment_Last (Original_Symbols); + Original_Symbols.Table + (Symbol_Table.Last (Original_Symbols)) := + (Name => + new String'(Line (Symbol_Vector'Length + 1 .. + Last - Equal_Procedure'Length)), + Kind => Proc, + Present => True); + + -- Anything else is incorrectly formatted + + else + if not Quiet then + Put_Line ("symbol file """ & Reference & + """ is incorrectly formatted:"); + Put_Line ("""" & Line (1 .. Last) & """"); + end if; + + Close (File); + Success := False; + return; + end if; + + -- Lines with "gsmatch=equal,<Major_ID>,<Minor_Id> + + elsif Last > Gsmatch'Length + and then Line (1 .. Gsmatch'Length) = Gsmatch + then + declare + Start : Positive := Gsmatch'Length + 1; + Finish : Positive := Start; + OK : Boolean := True; + ID : Integer; + + begin + loop + if Line (Finish) not in '0' .. '9' + or else Finish >= Last - 1 + then + OK := False; + exit; + end if; + + exit when Line (Finish + 1) = ','; + + Finish := Finish + 1; + end loop; + + if OK then + ID := Integer'Value (Line (Start .. Finish)); + OK := ID /= 0; + + -- If Soft_Major_ID is True, it means that + -- Library_Version was not specified. + + if Soft_Major_ID then + Major_ID := ID; + + -- If the Major ID in the reference file is different + -- from the Library_Version, then the Minor ID will be 0 + -- because there is no point in taking the Minor ID in + -- the reference file, or incrementing it. So, we set + -- Soft_Minor_ID to False, so that we don't modify + -- the Minor_ID later. + + elsif Major_ID /= ID then + Soft_Minor_ID := False; + end if; + + Start := Finish + 2; + Finish := Start; + + loop + if Line (Finish) not in '0' .. '9' then + OK := False; + exit; + end if; + + exit when Finish = Last; + + Finish := Finish + 1; + end loop; + + -- Only set Minor_ID if Soft_Minor_ID is True (see above) + + if OK and then Soft_Minor_ID then + Minor_ID := Integer'Value (Line (Start .. Finish)); + end if; + end if; + + -- If OK is not True, that means the line is not correctly + -- formatted. + + if not OK then + if not Quiet then + Put_Line ("symbol file """ & Reference & + """ is incorrectly formatted"); + Put_Line ("""" & Line (1 .. Last) & """"); + end if; + + Close (File); + Success := False; + return; + end if; + end; + + -- Anything else is incorrectly formatted + + else + if not Quiet then + Put_Line ("unexpected line in symbol file """ & + Reference & """"); + Put_Line ("""" & Line (1 .. Last) & """"); + end if; + + Close (File); + Success := False; + return; + end if; + end loop; + + Close (File); + end if; + end Initialize; + + ------------- + -- Process -- + ------------- + + procedure Process + (Object_File : String; + Success : out Boolean) + is + begin + -- Open the object file with Byte_IO. Return with Success = False if + -- this fails. + + begin + Open (File, In_File, Object_File); + exception + when others => + Put_Line + ("*** Unable to open object file """ & Object_File & """"); + Success := False; + return; + end; + + -- Assume that the object file has a correct format + + Success := True; + + -- Get the different sections one by one from the object file + + while not End_Of_File (File) loop + + Get (Code); + Get (Number_Of_Characters); + Number_Of_Characters := Number_Of_Characters - 4; + + -- If this is not a Global Symbol Definition section, skip to the + -- next section. + + if Code /= GSD then + + for J in 1 .. Number_Of_Characters loop + Read (File, B); + end loop; + + else + + -- Skip over the next 4 bytes + + Get (Dummy); + Get (Dummy); + Number_Of_Characters := Number_Of_Characters - 4; + + -- Get each subsection in turn + + loop + Get (Code); + Get (Nchars); + Get (Dummy); + Get (Flags); + Number_Of_Characters := Number_Of_Characters - 8; + Nchars := Nchars - 8; + + -- If this is a symbol and the V_DEF flag is set, get the + -- symbol. + + if Code = C_SYM and then ((Flags and V_DEF_Mask) /= 0) then + -- First, reach the symbol length + + for J in 1 .. 25 loop + Read (File, B); + Nchars := Nchars - 1; + Number_Of_Characters := Number_Of_Characters - 1; + end loop; + + Length := Byte'Pos (B); + LSymb := 0; + + -- Get the symbol characters + + for J in 1 .. Nchars loop + Read (File, B); + Number_Of_Characters := Number_Of_Characters - 1; + if Length > 0 then + LSymb := LSymb + 1; + Symbol (LSymb) := B; + Length := Length - 1; + end if; + end loop; + + -- Create the new Symbol + + declare + S_Data : Symbol_Data; + begin + S_Data.Name := new String'(Symbol (1 .. LSymb)); + + -- The symbol kind (Data or Procedure) depends on the + -- V_NORM flag. + + if (Flags and V_NORM_Mask) = 0 then + S_Data.Kind := Data; + + else + S_Data.Kind := Proc; + end if; + + -- Put the new symbol in the table + + Symbol_Table.Increment_Last (Complete_Symbols); + Complete_Symbols.Table + (Symbol_Table.Last (Complete_Symbols)) := S_Data; + end; + + else + -- As it is not a symbol subsection, skip to the next + -- subsection. + + for J in 1 .. Nchars loop + Read (File, B); + Number_Of_Characters := Number_Of_Characters - 1; + end loop; + end if; + + -- Exit the GSD section when number of characters reaches 0 + + exit when Number_Of_Characters = 0; + end loop; + end if; + end loop; + + -- The object file has been processed, close it + + Close (File); + + exception + -- For any exception, output an error message, close the object file + -- and return with Success = False. + + when X : others => + Put_Line ("unexpected exception raised while processing """ + & Object_File & """"); + Put_Line (Exception_Information (X)); + Close (File); + Success := False; + end Process; + + -------------- + -- Finalize -- + -------------- + + procedure Finalize + (Quiet : Boolean; + Success : out Boolean) + is + File : Ada.Text_IO.File_Type; + -- The symbol file + + S_Data : Symbol_Data; + -- A symbol + + Cur : Positive := 1; + -- Most probable index in the Complete_Symbols of the current symbol + -- in Original_Symbol. + + Found : Boolean; + + begin + -- Nothing to be done if Initialize has never been called + + if Symbol_File_Name = null then + Success := False; + + else + + -- First find if the symbols in the reference symbol file are also + -- in the object files. Note that this is not done if the policy is + -- Autonomous, because no reference symbol file has been read. + + -- Expect the first symbol in the symbol file to also be the first + -- in Complete_Symbols. + + Cur := 1; + + for Index_1 in 1 .. Symbol_Table.Last (Original_Symbols) loop + S_Data := Original_Symbols.Table (Index_1); + Found := False; + + First_Object_Loop : + for Index_2 in Cur .. Symbol_Table.Last (Complete_Symbols) loop + if Equal (S_Data, Complete_Symbols.Table (Index_2)) then + Cur := Index_2 + 1; + Complete_Symbols.Table (Index_2).Present := False; + Found := True; + exit First_Object_Loop; + end if; + end loop First_Object_Loop; + + -- If the symbol could not be found between Cur and Last, try + -- before Cur. + + if not Found then + Second_Object_Loop : + for Index_2 in 1 .. Cur - 1 loop + if Equal (S_Data, Complete_Symbols.Table (Index_2)) then + Cur := Index_2 + 1; + Complete_Symbols.Table (Index_2).Present := False; + Found := True; + exit Second_Object_Loop; + end if; + end loop Second_Object_Loop; + end if; + + -- If the symbol is not found, mark it as such in the table + + if not Found then + if (not Quiet) or else Sym_Policy = Controlled then + Put_Line ("symbol """ & S_Data.Name.all & + """ is no longer present in the object files"); + end if; + + if Sym_Policy = Controlled then + Success := False; + return; + + elsif Soft_Minor_ID then + Minor_ID := Minor_ID + 1; + Soft_Minor_ID := False; + end if; + + Original_Symbols.Table (Index_1).Present := False; + Free (Original_Symbols.Table (Index_1).Name); + + if Soft_Minor_ID then + Minor_ID := Minor_ID + 1; + Soft_Minor_ID := False; + end if; + end if; + end loop; + + -- Append additional symbols, if any, to the Original_Symbols table + + for Index in 1 .. Symbol_Table.Last (Complete_Symbols) loop + S_Data := Complete_Symbols.Table (Index); + + if S_Data.Present then + + if Sym_Policy = Controlled then + Put_Line ("symbol """ & S_Data.Name.all & + """ is not in the reference symbol file"); + Success := False; + return; + + elsif Soft_Minor_ID then + Minor_ID := Minor_ID + 1; + Soft_Minor_ID := False; + end if; + + Symbol_Table.Increment_Last (Original_Symbols); + Original_Symbols.Table (Symbol_Table.Last (Original_Symbols)) := + S_Data; + Complete_Symbols.Table (Index).Present := False; + end if; + end loop; + + -- Create the symbol file + + Create (File, Ada.Text_IO.Out_File, Symbol_File_Name.all); + + Put (File, Case_Sensitive); + Put_Line (File, "yes"); + + -- Put a line in the symbol file for each symbol in the symbol table + + for Index in 1 .. Symbol_Table.Last (Original_Symbols) loop + if Original_Symbols.Table (Index).Present then + Put (File, Symbol_Vector); + Put (File, Original_Symbols.Table (Index).Name.all); + + if Original_Symbols.Table (Index).Kind = Data then + Put_Line (File, Equal_Data); + + else + Put_Line (File, Equal_Procedure); + end if; + + Free (Original_Symbols.Table (Index).Name); + end if; + end loop; + + Put (File, Case_Sensitive); + Put_Line (File, "NO"); + + -- Put the version IDs + + Put (File, Gsmatch); + Put (File, Image (Major_ID)); + Put (File, ','); + Put_Line (File, Image (Minor_ID)); + + -- And we are done + + Close (File); + + -- Reset both tables + + Symbol_Table.Set_Last (Original_Symbols, 0); + Symbol_Table.Set_Last (Complete_Symbols, 0); + + -- Clear the symbol file name + + Free (Symbol_File_Name); + + Success := True; + end if; + + exception + when X : others => + Put_Line ("unexpected exception raised while finalizing """ + & Symbol_File_Name.all & """"); + Put_Line (Exception_Information (X)); + Success := False; + end Finalize; + +end Symbols; |