-- --
-- B o d y --
-- --
--- Copyright (C) 1999-2009, AdaCore --
+-- Copyright (C) 1999-2011, AdaCore --
-- --
-- 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- --
+-- 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 COPYING. If not, write --
--- to the Free Software Foundation, 51 Franklin Street, Fifth Floor, --
--- Boston, MA 02110-1301, USA. --
+-- or FITNESS FOR A PARTICULAR PURPOSE. --
-- --
--- As a special exception, if other files instantiate generics from this --
--- unit, or you link this unit with other files to produce an executable, --
--- this unit does not by itself cause the resulting executable to be --
--- covered by the GNU General Public License. This exception does not --
--- however invalidate any other reasons why the executable file might be --
--- covered by the GNU Public License. --
+-- As a special exception under Section 7 of GPL version 3, you are granted --
+-- additional permissions described in the GCC Runtime Library Exception, --
+-- version 3.1, as published by the Free Software Foundation. --
+-- --
+-- You should have received a copy of the GNU General Public License and --
+-- a copy of the GCC Runtime Library Exception along with this program; --
+-- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
+-- <http://www.gnu.org/licenses/>. --
-- --
-- GNAT was originally developed by the GNAT team at New York University. --
-- Extensive contributions were provided by Ada Core Technologies Inc. --
-- --
------------------------------------------------------------------------------
--- Run-time symbolic traceback support
+-- This is the default implementation for platforms where the full capability
+-- is not supported. It returns tracebacks as lists of LF separated strings of
+-- the form "0x..." corresponding to the addresses.
-with System.Soft_Links;
with Ada.Exceptions.Traceback; use Ada.Exceptions.Traceback;
+with System.Address_Image;
package body GNAT.Traceback.Symbolic is
- pragma Linker_Options ("-laddr2line");
- pragma Linker_Options ("-lbfd");
- pragma Linker_Options ("-liberty");
-
- package TSL renames System.Soft_Links;
-
- -- To perform the raw addresses to symbolic form translation we rely on a
- -- libaddr2line symbolizer which examines debug info from a provided
- -- executable file name, and an absolute path is needed to ensure the file
- -- is always found. This is "__gnat_locate_exec_on_path (gnat_argv [0])"
- -- for our executable file, a fairly heavy operation so we cache the
- -- result.
-
- Exename : System.Address;
- -- Pointer to the name of the executable file to be used on all
- -- invocations of the libaddr2line symbolization service.
-
- Exename_Resolved : Boolean := False;
- -- Flag to indicate whether we have performed the executable file name
- -- resolution already. Relying on a not null Exename for this purpose
- -- would be potentially inefficient as this is what we will get if the
- -- resolution attempt fails.
-
------------------------
-- Symbolic_Traceback --
------------------------
- function Symbolic_Traceback (Traceback : Tracebacks_Array) return String is
-
- procedure convert_addresses
- (filename : System.Address;
- addrs : System.Address;
- n_addrs : Integer;
- buf : System.Address;
- len : System.Address);
- pragma Import (C, convert_addresses, "convert_addresses");
- -- This is the procedure version of the Ada-aware addr2line. It places
- -- in BUF a string representing the symbolic translation of the N_ADDRS
- -- raw addresses provided in ADDRS, looked up in debug information from
- -- FILENAME. LEN points to an integer which contains the size of the
- -- BUF buffer at input and the result length at output.
- --
- -- This procedure is provided by libaddr2line on targets that support
- -- it. A dummy version is in adaint.c for other targets so that build
- -- of shared libraries doesn't generate unresolved symbols.
- --
- -- Note that this procedure is *not* thread-safe.
-
- type Argv_Array is array (0 .. 0) of System.Address;
- gnat_argv : access Argv_Array;
- pragma Import (C, gnat_argv, "gnat_argv");
-
- function locate_exec_on_path
- (c_exename : System.Address) return System.Address;
- pragma Import (C, locate_exec_on_path, "__gnat_locate_exec_on_path");
-
- Res : String (1 .. 256 * Traceback'Length);
- Len : Integer;
-
- use type System.Address;
-
+ function Symbolic_Traceback (Traceback : Tracebacks_Array) return String
+ is
begin
- -- The symbolic translation of an empty set of addresses is an empty
- -- string.
-
if Traceback'Length = 0 then
return "";
- end if;
-
- -- If our input set of raw addresses is not empty, resort to the
- -- libaddr2line service to symbolize it all.
-
- -- Compute, cache and provide the absolute path to our executable file
- -- name as the binary file where the relevant debug information is to be
- -- found. If the executable file name resolution fails, we have no
- -- sensible basis to invoke the symbolizer at all.
-
- -- Protect all this against concurrent accesses explicitly, as the
- -- underlying services are potentially thread unsafe.
-
- TSL.Lock_Task.all;
-
- if not Exename_Resolved then
- Exename := locate_exec_on_path (gnat_argv (0));
- Exename_Resolved := True;
- end if;
- if Exename /= System.Null_Address then
- Len := Res'Length;
- convert_addresses
- (Exename, Traceback'Address, Traceback'Length,
- Res (1)'Address, Len'Address);
- end if;
-
- TSL.Unlock_Task.all;
-
- -- Return what the addr2line symbolizer has produced if we have called
- -- it (the executable name resolution succeeded), or an empty string
- -- otherwise.
-
- if Exename /= System.Null_Address then
- return Res (1 .. Len);
else
- return "";
+ declare
+ Img : String := System.Address_Image (Traceback (Traceback'First));
+
+ Result : String (1 .. (Img'Length + 3) * Traceback'Length);
+ Last : Natural := 0;
+
+ begin
+ for J in Traceback'Range loop
+ Img := System.Address_Image (Traceback (J));
+ Result (Last + 1 .. Last + 2) := "0x";
+ Last := Last + 2;
+ Result (Last + 1 .. Last + Img'Length) := Img;
+ Last := Last + Img'Length + 1;
+ Result (Last) := ASCII.LF;
+ end loop;
+
+ return Result (1 .. Last);
+ end;
end if;
-
end Symbolic_Traceback;
- function Symbolic_Traceback (E : Exception_Occurrence) return String is
+ function Symbolic_Traceback (E : Exception_Occurrence) return String
+ is
begin
return Symbolic_Traceback (Tracebacks (E));
end Symbolic_Traceback;
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