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authorJing Yu <jingyu@google.com>2010-07-22 14:03:48 -0700
committerJing Yu <jingyu@google.com>2010-07-22 14:03:48 -0700
commitb094d6c4bf572654a031ecc4afe675154c886dc5 (patch)
tree89394c56b05e13a5413ee60237d65b0214fd98e2 /gcc-4.4.3/gcc/ada/symbols-processing-vms-ia64.adb
parentdc34721ac3bf7e3c406fba8cfe9d139393345ec5 (diff)
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commit gcc-4.4.3 which is used to build gcc-4.4.3 Android toolchain in master.
The source is based on fsf gcc-4.4.3 and contains local patches which are recorded in gcc-4.4.3/README.google. Change-Id: Id8c6d6927df274ae9749196a1cc24dbd9abc9887
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+------------------------------------------------------------------------------
+-- --
+-- GNAT COMPILER COMPONENTS --
+-- --
+-- S Y M B O L S . P R O C E S S I N G --
+-- --
+-- B o d y --
+-- --
+-- Copyright (C) 2004-2007, 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. --
+-- --
+------------------------------------------------------------------------------
+
+-- This is the VMS/IA64 version of this package
+
+with Ada.IO_Exceptions;
+
+with Ada.Unchecked_Deallocation;
+
+separate (Symbols)
+package body Processing is
+
+ type String_Array is array (Positive range <>) of String_Access;
+ type Strings_Ptr is access String_Array;
+
+ procedure Free is
+ new Ada.Unchecked_Deallocation (String_Array, Strings_Ptr);
+
+ type Section_Header is record
+ Shname : Integer;
+ Shtype : Integer;
+ Shoffset : Integer;
+ Shsize : Integer;
+ Shlink : Integer;
+ end record;
+
+ type Section_Header_Array is array (Natural range <>) of Section_Header;
+ type Section_Header_Ptr is access Section_Header_Array;
+
+ procedure Free is
+ new Ada.Unchecked_Deallocation (Section_Header_Array, Section_Header_Ptr);
+
+ -------------
+ -- Process --
+ -------------
+
+ procedure Process
+ (Object_File : String;
+ Success : out Boolean)
+ is
+ B : Byte;
+ W : Integer;
+
+ Str : String (1 .. 1000) := (others => ' ');
+ Str_Last : Natural;
+
+ Strings : Strings_Ptr;
+
+ Shoff : Integer;
+ Shnum : Integer;
+ Shentsize : Integer;
+
+ Shname : Integer;
+ Shtype : Integer;
+ Shoffset : Integer;
+ Shsize : Integer;
+ Shlink : Integer;
+
+ Symtab_Index : Natural := 0;
+ String_Table_Index : Natural := 0;
+
+ End_Symtab : Integer;
+
+ Stname : Integer;
+ Stinfo : Character;
+ Sttype : Integer;
+ Stbind : Integer;
+ Stshndx : Integer;
+
+ Section_Headers : Section_Header_Ptr;
+
+ Offset : Natural := 0;
+ OK : Boolean := True;
+
+ procedure Get_Byte (B : out Byte);
+ -- Read one byte from the object file
+
+ procedure Get_Half (H : out Integer);
+ -- Read one half work from the object file
+
+ procedure Get_Word (W : out Integer);
+ -- Read one full word from the object file
+
+ procedure Reset;
+ -- Restart reading the object file
+
+ procedure Skip_Half;
+ -- Read and disregard one half word from the object file
+
+ --------------
+ -- Get_Byte --
+ --------------
+
+ procedure Get_Byte (B : out Byte) is
+ begin
+ Byte_IO.Read (File, B);
+ Offset := Offset + 1;
+ end Get_Byte;
+
+ --------------
+ -- Get_Half --
+ --------------
+
+ procedure Get_Half (H : out Integer) is
+ C1, C2 : Character;
+ begin
+ Get_Byte (C1); Get_Byte (C2);
+ H :=
+ Integer'(Character'Pos (C2)) * 256 + Integer'(Character'Pos (C1));
+ end Get_Half;
+
+ --------------
+ -- Get_Word --
+ --------------
+
+ procedure Get_Word (W : out Integer) is
+ H1, H2 : Integer;
+ begin
+ Get_Half (H1); Get_Half (H2);
+ W := H2 * 256 * 256 + H1;
+ end Get_Word;
+
+ -----------
+ -- Reset --
+ -----------
+
+ procedure Reset is
+ begin
+ Offset := 0;
+ Byte_IO.Reset (File);
+ end Reset;
+
+ ---------------
+ -- Skip_Half --
+ ---------------
+
+ procedure Skip_Half is
+ B : Byte;
+ pragma Unreferenced (B);
+ begin
+ Byte_IO.Read (File, B);
+ Byte_IO.Read (File, B);
+ Offset := Offset + 2;
+ end Skip_Half;
+
+ -- Start of processing for Process
+
+ 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;
+
+ -- Skip ELF identification
+
+ while Offset < 16 loop
+ Get_Byte (B);
+ end loop;
+
+ -- Skip e_type
+
+ Skip_Half;
+
+ -- Skip e_machine
+
+ Skip_Half;
+
+ -- Skip e_version
+
+ Get_Word (W);
+
+ -- Skip e_entry
+
+ for J in 1 .. 8 loop
+ Get_Byte (B);
+ end loop;
+
+ -- Skip e_phoff
+
+ for J in 1 .. 8 loop
+ Get_Byte (B);
+ end loop;
+
+ Get_Word (Shoff);
+
+ -- Skip upper half of Shoff
+
+ for J in 1 .. 4 loop
+ Get_Byte (B);
+ end loop;
+
+ -- Skip e_flags
+
+ Get_Word (W);
+
+ -- Skip e_ehsize
+
+ Skip_Half;
+
+ -- Skip e_phentsize
+
+ Skip_Half;
+
+ -- Skip e_phnum
+
+ Skip_Half;
+
+ Get_Half (Shentsize);
+
+ Get_Half (Shnum);
+
+ Section_Headers := new Section_Header_Array (0 .. Shnum - 1);
+
+ -- Go to Section Headers
+
+ while Offset < Shoff loop
+ Get_Byte (B);
+ end loop;
+
+ -- Reset Symtab_Index
+
+ Symtab_Index := 0;
+
+ for J in Section_Headers'Range loop
+
+ -- Get the data for each Section Header
+
+ Get_Word (Shname);
+ Get_Word (Shtype);
+
+ for K in 1 .. 16 loop
+ Get_Byte (B);
+ end loop;
+
+ Get_Word (Shoffset);
+ Get_Word (W);
+
+ Get_Word (Shsize);
+ Get_Word (W);
+
+ Get_Word (Shlink);
+
+ while (Offset - Shoff) mod Shentsize /= 0 loop
+ Get_Byte (B);
+ end loop;
+
+ -- If this is the Symbol Table Section Header, record its index
+
+ if Shtype = 2 then
+ Symtab_Index := J;
+ end if;
+
+ Section_Headers (J) := (Shname, Shtype, Shoffset, Shsize, Shlink);
+ end loop;
+
+ if Symtab_Index = 0 then
+ Success := False;
+ return;
+ end if;
+
+ End_Symtab :=
+ Section_Headers (Symtab_Index).Shoffset +
+ Section_Headers (Symtab_Index).Shsize;
+
+ String_Table_Index := Section_Headers (Symtab_Index).Shlink;
+ Strings :=
+ new String_Array (1 .. Section_Headers (String_Table_Index).Shsize);
+
+ -- Go get the String Table section for the Symbol Table
+
+ Reset;
+
+ while Offset < Section_Headers (String_Table_Index).Shoffset loop
+ Get_Byte (B);
+ end loop;
+
+ Offset := 0;
+
+ Get_Byte (B); -- zero
+
+ while Offset < Section_Headers (String_Table_Index).Shsize loop
+ Str_Last := 0;
+
+ loop
+ Get_Byte (B);
+ if B /= ASCII.NUL then
+ Str_Last := Str_Last + 1;
+ Str (Str_Last) := B;
+
+ else
+ Strings (Offset - Str_Last - 1) :=
+ new String'(Str (1 .. Str_Last));
+ exit;
+ end if;
+ end loop;
+ end loop;
+
+ -- Go get the Symbol Table
+
+ Reset;
+
+ while Offset < Section_Headers (Symtab_Index).Shoffset loop
+ Get_Byte (B);
+ end loop;
+
+ while Offset < End_Symtab loop
+ Get_Word (Stname);
+ Get_Byte (Stinfo);
+ Get_Byte (B);
+ Get_Half (Stshndx);
+ for J in 1 .. 4 loop
+ Get_Word (W);
+ end loop;
+
+ Sttype := Integer'(Character'Pos (Stinfo)) mod 16;
+ Stbind := Integer'(Character'Pos (Stinfo)) / 16;
+
+ if (Sttype = 1 or else Sttype = 2)
+ and then Stbind /= 0
+ and then Stshndx /= 0
+ then
+ -- Check if this is a symbol from a generic body
+
+ OK := True;
+
+ for J in Strings (Stname)'First .. Strings (Stname)'Last - 2 loop
+ if Strings (Stname) (J) = 'G'
+ and then Strings (Stname) (J + 1) = 'P'
+ and then Strings (Stname) (J + 2) in '0' .. '9'
+ then
+ OK := False;
+ exit;
+ end if;
+ end loop;
+
+ if OK then
+ declare
+ S_Data : Symbol_Data;
+ begin
+ S_Data.Name := new String'(Strings (Stname).all);
+
+ if Sttype = 1 then
+ S_Data.Kind := Data;
+
+ else
+ S_Data.Kind := Proc;
+ end if;
+
+ -- Put the new symbol in the table
+
+ Symbol_Table.Append (Complete_Symbols, S_Data);
+ end;
+ end if;
+ end if;
+ end loop;
+
+ -- The object file has been processed, close it
+
+ Close (File);
+
+ -- Free the allocated memory
+
+ Free (Section_Headers);
+
+ for J in Strings'Range loop
+ if Strings (J) /= null then
+ Free (Strings (J));
+ end if;
+ end loop;
+
+ Free (Strings);
+
+ exception
+ -- For any exception, output an error message, close the object file
+ -- and return with Success = False.
+
+ when Ada.IO_Exceptions.End_Error =>
+ Close (File);
+
+ when X : others =>
+ Put_Line ("unexpected exception raised while processing """
+ & Object_File & """");
+ Put_Line (Exception_Information (X));
+ Close (File);
+ Success := False;
+ end Process;
+
+end Processing;