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------------------------------------------------------------------------------ -- -- -- GNAT COMPILER COMPONENTS -- -- -- -- ADA.EXCEPTIONS.EXCEPTION_DATA -- -- -- -- B o d y -- -- -- -- Copyright (C) 1992-2011, 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. -- -- -- -- 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. -- -- -- ------------------------------------------------------------------------------ with System.Storage_Elements; use System.Storage_Elements; separate (Ada.Exceptions) package body Exception_Data is -- This unit implements the Exception_Information related services for -- both the Ada standard requirements and the GNAT.Exception_Traces -- facility. -- There are common parts between the contents of Exception_Information -- (the regular Ada interface) and Tailored_Exception_Information (what -- the automatic backtracing output includes). The overall structure is -- sketched below: -- -- Exception_Information -- | -- +-------+--------+ -- | | -- Basic_Exc_Info & Basic_Exc_Tback -- (B_E_I) (B_E_TB) -- o-- -- (B_E_I) | Exception_Name: <exception name> (as in Exception_Name) -- | Message: <message> (or a null line if no message) -- | PID=nnnn (if != 0) -- o-- -- (B_E_TB) | Call stack traceback locations: -- | <0xyyyyyyyy 0xyyyyyyyy ...> -- o-- -- Tailored_Exception_Information -- | -- +----------+----------+ -- | | -- Basic_Exc_Info & Tailored_Exc_Tback -- | -- +-----------+------------+ -- | | -- Basic_Exc_Tback Or Tback_Decorator -- if no decorator set otherwise -- Functions returning String imply secondary stack use, which is a heavy -- mechanism requiring run-time support. Besides, some of the routines we -- provide here are to be used by the default Last_Chance_Handler, at the -- critical point where the runtime is about to be finalized. Since most -- of the items we have at hand are of bounded length, we also provide a -- procedural interface able to incrementally append the necessary bits to -- a preallocated buffer or output them straight to stderr. -- The procedural interface is composed of two major sections: a neutral -- section for basic types like Address, Character, Natural or String, and -- an exception oriented section for the e.g. Basic_Exception_Information. -- This is the Append_Info family of procedures below. -- Output to stderr is commanded by passing an empty buffer to update, and -- care is taken not to overflow otherwise. -------------------------------------------- -- Procedural Interface - Neutral section -- -------------------------------------------- procedure Append_Info_Address (A : Address; Info : in out String; Ptr : in out Natural); procedure Append_Info_Character (C : Character; Info : in out String; Ptr : in out Natural); procedure Append_Info_Nat (N : Natural; Info : in out String; Ptr : in out Natural); procedure Append_Info_NL (Info : in out String; Ptr : in out Natural); pragma Inline (Append_Info_NL); procedure Append_Info_String (S : String; Info : in out String; Ptr : in out Natural); ------------------------------------------------------- -- Procedural Interface - Exception oriented section -- ------------------------------------------------------- procedure Append_Info_Exception_Name (Id : Exception_Id; Info : in out String; Ptr : in out Natural); procedure Append_Info_Exception_Name (X : Exception_Occurrence; Info : in out String; Ptr : in out Natural); procedure Append_Info_Exception_Message (X : Exception_Occurrence; Info : in out String; Ptr : in out Natural); procedure Append_Info_Basic_Exception_Information (X : Exception_Occurrence; Info : in out String; Ptr : in out Natural); procedure Append_Info_Basic_Exception_Traceback (X : Exception_Occurrence; Info : in out String; Ptr : in out Natural); procedure Append_Info_Exception_Information (X : Exception_Occurrence; Info : in out String; Ptr : in out Natural); -- The "functional" interface to the exception information not involving -- a traceback decorator uses preallocated intermediate buffers to avoid -- the use of secondary stack. Preallocation requires preliminary length -- computation, for which a series of functions are introduced: --------------------------------- -- Length evaluation utilities -- --------------------------------- function Basic_Exception_Info_Maxlength (X : Exception_Occurrence) return Natural; function Basic_Exception_Tback_Maxlength (X : Exception_Occurrence) return Natural; function Exception_Info_Maxlength (X : Exception_Occurrence) return Natural; function Exception_Name_Length (Id : Exception_Id) return Natural; function Exception_Name_Length (X : Exception_Occurrence) return Natural; function Exception_Message_Length (X : Exception_Occurrence) return Natural; -------------------------- -- Functional Interface -- -------------------------- function Basic_Exception_Traceback (X : Exception_Occurrence) return String; -- Returns an image of the complete call chain associated with an -- exception occurrence in its most basic form, that is as a raw sequence -- of hexadecimal binary addresses. function Tailored_Exception_Traceback (X : Exception_Occurrence) return String; -- Returns an image of the complete call chain associated with an -- exception occurrence, either in its basic form if no decorator is -- in place, or as formatted by the decorator otherwise. ----------------------------------------------------------------------- -- Services for the default Last_Chance_Handler and the task wrapper -- ----------------------------------------------------------------------- pragma Export (Ada, Append_Info_Exception_Message, "__gnat_append_info_e_msg"); pragma Export (Ada, Append_Info_Exception_Information, "__gnat_append_info_e_info"); pragma Export (Ada, Exception_Message_Length, "__gnat_exception_msg_len"); ------------------------- -- Append_Info_Address -- ------------------------- procedure Append_Info_Address (A : Address; Info : in out String; Ptr : in out Natural) is S : String (1 .. 18); P : Natural; N : Integer_Address; H : constant array (Integer range 0 .. 15) of Character := "0123456789abcdef"; begin P := S'Last; N := To_Integer (A); loop S (P) := H (Integer (N mod 16)); P := P - 1; N := N / 16; exit when N = 0; end loop; S (P - 1) := '0'; S (P) := 'x'; Append_Info_String (S (P - 1 .. S'Last), Info, Ptr); end Append_Info_Address; --------------------------- -- Append_Info_Character -- --------------------------- procedure Append_Info_Character (C : Character; Info : in out String; Ptr : in out Natural) is begin if Info'Length = 0 then To_Stderr (C); elsif Ptr < Info'Last then Ptr := Ptr + 1; Info (Ptr) := C; end if; end Append_Info_Character; --------------------- -- Append_Info_Nat -- --------------------- procedure Append_Info_Nat (N : Natural; Info : in out String; Ptr : in out Natural) is begin if N > 9 then Append_Info_Nat (N / 10, Info, Ptr); end if; Append_Info_Character (Character'Val (Character'Pos ('0') + N mod 10), Info, Ptr); end Append_Info_Nat; -------------------- -- Append_Info_NL -- -------------------- procedure Append_Info_NL (Info : in out String; Ptr : in out Natural) is begin Append_Info_Character (ASCII.LF, Info, Ptr); end Append_Info_NL; ------------------------ -- Append_Info_String -- ------------------------ procedure Append_Info_String (S : String; Info : in out String; Ptr : in out Natural) is begin if Info'Length = 0 then To_Stderr (S); else declare Last : constant Natural := Integer'Min (Ptr + S'Length, Info'Last); begin Info (Ptr + 1 .. Last) := S; Ptr := Last; end; end if; end Append_Info_String; --------------------------------------------- -- Append_Info_Basic_Exception_Information -- --------------------------------------------- -- To ease the maximum length computation, we define and pull out a couple -- of string constants: BEI_Name_Header : constant String := "Exception name: "; BEI_Msg_Header : constant String := "Message: "; BEI_PID_Header : constant String := "PID: "; procedure Append_Info_Basic_Exception_Information (X : Exception_Occurrence; Info : in out String; Ptr : in out Natural) is Name : String (1 .. Exception_Name_Length (X)); -- Buffer in which to fetch the exception name, in order to check -- whether this is an internal _ABORT_SIGNAL or a regular occurrence. Name_Ptr : Natural := Name'First - 1; begin -- Output exception name and message except for _ABORT_SIGNAL, where -- these two lines are omitted. Append_Info_Exception_Name (X, Name, Name_Ptr); if Name (Name'First) /= '_' then Append_Info_String (BEI_Name_Header, Info, Ptr); Append_Info_String (Name, Info, Ptr); Append_Info_NL (Info, Ptr); if Exception_Message_Length (X) /= 0 then Append_Info_String (BEI_Msg_Header, Info, Ptr); Append_Info_Exception_Message (X, Info, Ptr); Append_Info_NL (Info, Ptr); end if; end if; -- Output PID line if non-zero if X.Pid /= 0 then Append_Info_String (BEI_PID_Header, Info, Ptr); Append_Info_Nat (X.Pid, Info, Ptr); Append_Info_NL (Info, Ptr); end if; end Append_Info_Basic_Exception_Information; ------------------------------------------- -- Basic_Exception_Information_Maxlength -- ------------------------------------------- function Basic_Exception_Info_Maxlength (X : Exception_Occurrence) return Natural is begin return BEI_Name_Header'Length + Exception_Name_Length (X) + 1 + BEI_Msg_Header'Length + Exception_Message_Length (X) + 1 + BEI_PID_Header'Length + 15; end Basic_Exception_Info_Maxlength; ------------------------------------------- -- Append_Info_Basic_Exception_Traceback -- ------------------------------------------- -- As for Basic_Exception_Information: BETB_Header : constant String := "Call stack traceback locations:"; procedure Append_Info_Basic_Exception_Traceback (X : Exception_Occurrence; Info : in out String; Ptr : in out Natural) is begin if X.Num_Tracebacks = 0 then return; end if; Append_Info_String (BETB_Header, Info, Ptr); Append_Info_NL (Info, Ptr); for J in 1 .. X.Num_Tracebacks loop Append_Info_Address (TBE.PC_For (X.Tracebacks (J)), Info, Ptr); exit when J = X.Num_Tracebacks; Append_Info_Character (' ', Info, Ptr); end loop; Append_Info_NL (Info, Ptr); end Append_Info_Basic_Exception_Traceback; ----------------------------------------- -- Basic_Exception_Traceback_Maxlength -- ----------------------------------------- function Basic_Exception_Tback_Maxlength (X : Exception_Occurrence) return Natural is Space_Per_Traceback : constant := 2 + 16 + 1; -- Space for "0x" + HHHHHHHHHHHHHHHH + " " begin return BETB_Header'Length + 1 + X.Num_Tracebacks * Space_Per_Traceback + 1; end Basic_Exception_Tback_Maxlength; --------------------------------------- -- Append_Info_Exception_Information -- --------------------------------------- procedure Append_Info_Exception_Information (X : Exception_Occurrence; Info : in out String; Ptr : in out Natural) is begin Append_Info_Basic_Exception_Information (X, Info, Ptr); Append_Info_Basic_Exception_Traceback (X, Info, Ptr); end Append_Info_Exception_Information; ------------------------------ -- Exception_Info_Maxlength -- ------------------------------ function Exception_Info_Maxlength (X : Exception_Occurrence) return Natural is begin return Basic_Exception_Info_Maxlength (X) + Basic_Exception_Tback_Maxlength (X); end Exception_Info_Maxlength; ----------------------------------- -- Append_Info_Exception_Message -- ----------------------------------- procedure Append_Info_Exception_Message (X : Exception_Occurrence; Info : in out String; Ptr : in out Natural) is begin if X.Id = Null_Id then raise Constraint_Error; end if; declare Len : constant Natural := Exception_Message_Length (X); Msg : constant String (1 .. Len) := X.Msg (1 .. Len); begin Append_Info_String (Msg, Info, Ptr); end; end Append_Info_Exception_Message; -------------------------------- -- Append_Info_Exception_Name -- -------------------------------- procedure Append_Info_Exception_Name (Id : Exception_Id; Info : in out String; Ptr : in out Natural) is begin if Id = Null_Id then raise Constraint_Error; end if; declare Len : constant Natural := Exception_Name_Length (Id); Name : constant String (1 .. Len) := To_Ptr (Id.Full_Name) (1 .. Len); begin Append_Info_String (Name, Info, Ptr); end; end Append_Info_Exception_Name; procedure Append_Info_Exception_Name (X : Exception_Occurrence; Info : in out String; Ptr : in out Natural) is begin Append_Info_Exception_Name (X.Id, Info, Ptr); end Append_Info_Exception_Name; --------------------------- -- Exception_Name_Length -- --------------------------- function Exception_Name_Length (Id : Exception_Id) return Natural is begin -- What is stored in the internal Name buffer includes a terminating -- null character that we never care about. return Id.Name_Length - 1; end Exception_Name_Length; function Exception_Name_Length (X : Exception_Occurrence) return Natural is begin return Exception_Name_Length (X.Id); end Exception_Name_Length; ------------------------------ -- Exception_Message_Length -- ------------------------------ function Exception_Message_Length (X : Exception_Occurrence) return Natural is begin return X.Msg_Length; end Exception_Message_Length; ------------------------------- -- Basic_Exception_Traceback -- ------------------------------- function Basic_Exception_Traceback (X : Exception_Occurrence) return String is Info : aliased String (1 .. Basic_Exception_Tback_Maxlength (X)); Ptr : Natural := Info'First - 1; begin Append_Info_Basic_Exception_Traceback (X, Info, Ptr); return Info (Info'First .. Ptr); end Basic_Exception_Traceback; --------------------------- -- Exception_Information -- --------------------------- function Exception_Information (X : Exception_Occurrence) return String is Info : String (1 .. Exception_Info_Maxlength (X)); Ptr : Natural := Info'First - 1; begin Append_Info_Exception_Information (X, Info, Ptr); return Info (Info'First .. Ptr); end Exception_Information; ------------------------- -- Set_Exception_C_Msg -- ------------------------- procedure Set_Exception_C_Msg (Id : Exception_Id; Msg1 : System.Address; Line : Integer := 0; Column : Integer := 0; Msg2 : System.Address := System.Null_Address) is Excep : constant EOA := Get_Current_Excep.all; Remind : Integer; Ptr : Natural; procedure Append_Number (Number : Integer); -- Append given number to Excep.Msg ------------------- -- Append_Number -- ------------------- procedure Append_Number (Number : Integer) is Val : Integer; Size : Integer; begin if Number <= 0 then return; end if; -- Compute the number of needed characters Size := 1; Val := Number; while Val > 0 loop Val := Val / 10; Size := Size + 1; end loop; -- If enough characters are available, put the line number if Excep.Msg_Length <= Exception_Msg_Max_Length - Size then Excep.Msg (Excep.Msg_Length + 1) := ':'; Excep.Msg_Length := Excep.Msg_Length + Size; Val := Number; Size := 0; while Val > 0 loop Remind := Val rem 10; Val := Val / 10; Excep.Msg (Excep.Msg_Length - Size) := Character'Val (Remind + Character'Pos ('0')); Size := Size + 1; end loop; end if; end Append_Number; -- Start of processing for Set_Exception_C_Msg begin Excep.Exception_Raised := False; Excep.Id := Id; Excep.Num_Tracebacks := 0; Excep.Pid := Local_Partition_ID; Excep.Msg_Length := 0; while To_Ptr (Msg1) (Excep.Msg_Length + 1) /= ASCII.NUL and then Excep.Msg_Length < Exception_Msg_Max_Length loop Excep.Msg_Length := Excep.Msg_Length + 1; Excep.Msg (Excep.Msg_Length) := To_Ptr (Msg1) (Excep.Msg_Length); end loop; Append_Number (Line); Append_Number (Column); -- Append second message if present if Msg2 /= System.Null_Address and then Excep.Msg_Length + 1 < Exception_Msg_Max_Length then Excep.Msg_Length := Excep.Msg_Length + 1; Excep.Msg (Excep.Msg_Length) := ' '; Ptr := 1; while To_Ptr (Msg2) (Ptr) /= ASCII.NUL and then Excep.Msg_Length < Exception_Msg_Max_Length loop Excep.Msg_Length := Excep.Msg_Length + 1; Excep.Msg (Excep.Msg_Length) := To_Ptr (Msg2) (Ptr); Ptr := Ptr + 1; end loop; end if; end Set_Exception_C_Msg; ----------------------- -- Set_Exception_Msg -- ----------------------- procedure Set_Exception_Msg (Id : Exception_Id; Message : String) is Len : constant Natural := Natural'Min (Message'Length, Exception_Msg_Max_Length); First : constant Integer := Message'First; Excep : constant EOA := Get_Current_Excep.all; begin Excep.Exception_Raised := False; Excep.Msg_Length := Len; Excep.Msg (1 .. Len) := Message (First .. First + Len - 1); Excep.Id := Id; Excep.Num_Tracebacks := 0; Excep.Pid := Local_Partition_ID; end Set_Exception_Msg; ---------------------------------- -- Tailored_Exception_Traceback -- ---------------------------------- function Tailored_Exception_Traceback (X : Exception_Occurrence) return String is -- We reference the decorator *wrapper* here and not the decorator -- itself. The purpose of the local variable Wrapper is to prevent a -- potential race condition in the code below. The atomicity of this -- assignment is enforced by pragma Atomic in System.Soft_Links. -- The potential race condition here, if no local variable was used, -- relates to the test upon the wrapper's value and the call, which -- are not performed atomically. With the local variable, potential -- changes of the wrapper's global value between the test and the -- call become inoffensive. Wrapper : constant Traceback_Decorator_Wrapper_Call := Traceback_Decorator_Wrapper; begin if Wrapper = null then return Basic_Exception_Traceback (X); else return Wrapper.all (X.Tracebacks'Address, X.Num_Tracebacks); end if; end Tailored_Exception_Traceback; ------------------------------------ -- Tailored_Exception_Information -- ------------------------------------ function Tailored_Exception_Information (X : Exception_Occurrence) return String is -- The tailored exception information is the basic information -- associated with the tailored call chain backtrace. Tback_Info : constant String := Tailored_Exception_Traceback (X); Tback_Len : constant Natural := Tback_Info'Length; Info : String (1 .. Basic_Exception_Info_Maxlength (X) + Tback_Len); Ptr : Natural := Info'First - 1; begin Append_Info_Basic_Exception_Information (X, Info, Ptr); Append_Info_String (Tback_Info, Info, Ptr); return Info (Info'First .. Ptr); end Tailored_Exception_Information; end Exception_Data;
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