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------------------------------------------------------------------------------ -- -- -- GNAT COMPILER COMPONENTS -- -- -- -- A D A . E X C E P T I O N S -- -- -- -- 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. -- -- -- ------------------------------------------------------------------------------ -- This version of Ada.Exceptions fully supports both Ada 95 and Ada 2005. -- It is used in all situations except for the build of the compiler and -- other basic tools. For these latter builds, we use an Ada 95-only version. -- The reason for this splitting off of a separate version is that bootstrap -- compilers often will be used that do not support Ada 2005 features, and -- Ada.Exceptions is part of the compiler sources. pragma Style_Checks (All_Checks); -- No subprogram ordering check, due to logical grouping pragma Polling (Off); -- We must turn polling off for this unit, because otherwise we get -- elaboration circularities with System.Exception_Tables. with System; use System; with System.Exceptions; use System.Exceptions; with System.Exceptions_Debug; use System.Exceptions_Debug; with System.Standard_Library; use System.Standard_Library; with System.Soft_Links; use System.Soft_Links; with System.WCh_Con; use System.WCh_Con; with System.WCh_StW; use System.WCh_StW; package body Ada.Exceptions is pragma Suppress (All_Checks); -- We definitely do not want exceptions occurring within this unit, or -- we are in big trouble. If an exceptional situation does occur, better -- that it not be raised, since raising it can cause confusing chaos. ----------------------- -- Local Subprograms -- ----------------------- -- Note: the exported subprograms in this package body are called directly -- from C clients using the given external name, even though they are not -- technically visible in the Ada sense. function Code_Address_For_AAA return System.Address; function Code_Address_For_ZZZ return System.Address; -- Return start and end of procedures in this package -- -- These procedures are used to provide exclusion bounds in -- calls to Call_Chain at exception raise points from this unit. The -- purpose is to arrange for the exception tracebacks not to include -- frames from routines involved in the raise process, as these are -- meaningless from the user's standpoint. -- -- For these bounds to be meaningful, we need to ensure that the object -- code for the routines involved in processing a raise is located after -- the object code Code_Address_For_AAA and before the object code -- Code_Address_For_ZZZ. This will indeed be the case as long as the -- following rules are respected: -- -- 1) The bodies of the subprograms involved in processing a raise -- are located after the body of Code_Address_For_AAA and before the -- body of Code_Address_For_ZZZ. -- -- 2) No pragma Inline applies to any of these subprograms, as this -- could delay the corresponding assembly output until the end of -- the unit. procedure Call_Chain (Excep : EOA); -- Store up to Max_Tracebacks in Excep, corresponding to the current -- call chain. function Image (Index : Integer) return String; -- Return string image corresponding to Index procedure To_Stderr (S : String); pragma Export (Ada, To_Stderr, "__gnat_to_stderr"); -- Little routine to output string to stderr that is also used -- in the tasking run time. procedure To_Stderr (C : Character); pragma Inline (To_Stderr); pragma Export (Ada, To_Stderr, "__gnat_to_stderr_char"); -- Little routine to output a character to stderr, used by some of -- the separate units below. package Exception_Data is --------------------------------- -- Exception messages routines -- --------------------------------- procedure Set_Exception_C_Msg (Id : Exception_Id; Msg1 : System.Address; Line : Integer := 0; Column : Integer := 0; Msg2 : System.Address := System.Null_Address); -- This routine is called to setup the exception referenced by the -- Current_Excep field in the TSD to contain the indicated Id value -- and message. Msg1 is a null terminated string which is generated -- as the exception message. If line is non-zero, then a colon and -- the decimal representation of this integer is appended to the -- message. Ditto for Column. When Msg2 is non-null, a space and this -- additional null terminated string is added to the message. procedure Set_Exception_Msg (Id : Exception_Id; Message : String); -- This routine is called to setup the exception referenced by the -- Current_Excep field in the TSD to contain the indicated Id value -- and message. Message is a string which is generated as the -- exception message. -------------------------------------- -- Exception information subprogram -- -------------------------------------- function Exception_Information (X : Exception_Occurrence) return String; -- The format of the exception information is as follows: -- -- Exception_Name: <exception name> (as in Exception_Name) -- Message: <message> (only if Exception_Message is empty) -- PID=nnnn (only if != 0) -- Call stack traceback locations: (only if at least one location) -- <0xyyyyyyyy 0xyyyyyyyy ...> (is recorded) -- -- The lines are separated by a ASCII.LF character. -- The nnnn is the partition Id given as decimal digits. -- The 0x... line represents traceback program counter locations, in -- execution order with the first one being the exception location. It -- is present only -- -- The Exception_Name and Message lines are omitted in the abort -- signal case, since this is not really an exception. -- !! If the format of the generated string is changed, please note -- !! that an equivalent modification to the routine String_To_EO must -- !! be made to preserve proper functioning of the stream attributes. --------------------------------------- -- Exception backtracing subprograms -- --------------------------------------- -- What is automatically output when exception tracing is on is the -- usual exception information with the call chain backtrace possibly -- tailored by a backtrace decorator. Modifying Exception_Information -- itself is not a good idea because the decorated output is completely -- out of control and would break all our code related to the streaming -- of exceptions. We then provide an alternative function to compute -- the possibly tailored output, which is equivalent if no decorator is -- currently set: function Tailored_Exception_Information (X : Exception_Occurrence) return String; -- Exception information to be output in the case of automatic tracing -- requested through GNAT.Exception_Traces. -- -- This is the same as Exception_Information if no backtrace decorator -- is currently in place. Otherwise, this is Exception_Information with -- the call chain raw addresses replaced by the result of a call to the -- current decorator provided with the call chain addresses. pragma Export (Ada, Tailored_Exception_Information, "__gnat_tailored_exception_information"); -- This is currently used by System.Tasking.Stages end Exception_Data; package Exception_Traces is use Exception_Data; -- Imports Tailored_Exception_Information ---------------------------------------------- -- Run-Time Exception Notification Routines -- ---------------------------------------------- -- These subprograms provide a common run-time interface to trigger the -- actions required when an exception is about to be propagated (e.g. -- user specified actions or output of exception information). They are -- exported to be usable by the Ada exception handling personality -- routine when the GCC 3 mechanism is used. procedure Notify_Handled_Exception; pragma Export (C, Notify_Handled_Exception, "__gnat_notify_handled_exception"); -- This routine is called for a handled occurrence is about to be -- propagated. procedure Notify_Unhandled_Exception; pragma Export (C, Notify_Unhandled_Exception, "__gnat_notify_unhandled_exception"); -- This routine is called when an unhandled occurrence is about to be -- propagated. procedure Unhandled_Exception_Terminate; pragma No_Return (Unhandled_Exception_Terminate); -- This procedure is called to terminate execution following an -- unhandled exception. The exception information, including -- traceback if available is output, and execution is then -- terminated. Note that at the point where this routine is -- called, the stack has typically been destroyed. end Exception_Traces; package Exception_Propagation is use Exception_Traces; -- Imports Notify_Unhandled_Exception and -- Unhandled_Exception_Terminate ------------------------------------ -- Exception propagation routines -- ------------------------------------ procedure Propagate_Exception; pragma No_Return (Propagate_Exception); -- This procedure propagates the exception represented by the occurrence -- referenced by Current_Excep in the TSD for the current task. end Exception_Propagation; package Stream_Attributes is -------------------------------- -- Stream attributes routines -- -------------------------------- function EId_To_String (X : Exception_Id) return String; function String_To_EId (S : String) return Exception_Id; -- Functions for implementing Exception_Id stream attributes function EO_To_String (X : Exception_Occurrence) return String; function String_To_EO (S : String) return Exception_Occurrence; -- Functions for implementing Exception_Occurrence stream -- attributes end Stream_Attributes; procedure Raise_Current_Excep (E : Exception_Id); pragma No_Return (Raise_Current_Excep); pragma Export (C, Raise_Current_Excep, "__gnat_raise_nodefer_with_msg"); -- This is a simple wrapper to Exception_Propagation.Propagate_Exception. -- -- This external name for Raise_Current_Excep is historical, and probably -- should be changed but for now we keep it, because gdb and gigi know -- about it. procedure Raise_Exception_No_Defer (E : Exception_Id; Message : String := ""); pragma Export (Ada, Raise_Exception_No_Defer, "ada__exceptions__raise_exception_no_defer"); pragma No_Return (Raise_Exception_No_Defer); -- Similar to Raise_Exception, but with no abort deferral procedure Raise_With_Msg (E : Exception_Id); pragma No_Return (Raise_With_Msg); pragma Export (C, Raise_With_Msg, "__gnat_raise_with_msg"); -- Raises an exception with given exception id value. A message -- is associated with the raise, and has already been stored in the -- exception occurrence referenced by the Current_Excep in the TSD. -- Abort is deferred before the raise call. procedure Raise_With_Location_And_Msg (E : Exception_Id; F : System.Address; L : Integer; C : Integer := 0; M : System.Address := System.Null_Address); pragma No_Return (Raise_With_Location_And_Msg); -- Raise an exception with given exception id value. A filename and line -- number is associated with the raise and is stored in the exception -- occurrence and in addition a column and a string message M may be -- appended to this (if not null/0). procedure Raise_Constraint_Error (File : System.Address; Line : Integer); pragma No_Return (Raise_Constraint_Error); pragma Export (C, Raise_Constraint_Error, "__gnat_raise_constraint_error"); -- Raise constraint error with file:line information procedure Raise_Constraint_Error_Msg (File : System.Address; Line : Integer; Column : Integer; Msg : System.Address); pragma No_Return (Raise_Constraint_Error_Msg); pragma Export (C, Raise_Constraint_Error_Msg, "__gnat_raise_constraint_error_msg"); -- Raise constraint error with file:line:col + msg information procedure Raise_Program_Error (File : System.Address; Line : Integer); pragma No_Return (Raise_Program_Error); pragma Export (C, Raise_Program_Error, "__gnat_raise_program_error"); -- Raise program error with file:line information procedure Raise_Program_Error_Msg (File : System.Address; Line : Integer; Msg : System.Address); pragma No_Return (Raise_Program_Error_Msg); pragma Export (C, Raise_Program_Error_Msg, "__gnat_raise_program_error_msg"); -- Raise program error with file:line + msg information procedure Raise_Storage_Error (File : System.Address; Line : Integer); pragma No_Return (Raise_Storage_Error); pragma Export (C, Raise_Storage_Error, "__gnat_raise_storage_error"); -- Raise storage error with file:line information procedure Raise_Storage_Error_Msg (File : System.Address; Line : Integer; Msg : System.Address); pragma No_Return (Raise_Storage_Error_Msg); pragma Export (C, Raise_Storage_Error_Msg, "__gnat_raise_storage_error_msg"); -- Raise storage error with file:line + reason msg information -- The exception raising process and the automatic tracing mechanism rely -- on some careful use of flags attached to the exception occurrence. The -- graph below illustrates the relations between the Raise_ subprograms -- and identifies the points where basic flags such as Exception_Raised -- are initialized. -- -- (i) signs indicate the flags initialization points. R stands for Raise, -- W for With, and E for Exception. -- -- R_No_Msg R_E R_Pe R_Ce R_Se -- | | | | | -- +--+ +--+ +---+ | +---+ -- | | | | | -- R_E_No_Defer(i) R_W_Msg(i) R_W_Loc -- | | | | -- +------------+ | +-----------+ +--+ -- | | | | -- | | | Set_E_C_Msg(i) -- | | | -- Raise_Current_Excep procedure Reraise; pragma No_Return (Reraise); pragma Export (C, Reraise, "__gnat_reraise"); -- Reraises the exception referenced by the Current_Excep field of -- the TSD (all fields of this exception occurrence are set). Abort -- is deferred before the reraise operation. procedure Transfer_Occurrence (Target : Exception_Occurrence_Access; Source : Exception_Occurrence); pragma Export (C, Transfer_Occurrence, "__gnat_transfer_occurrence"); -- Called from System.Tasking.RendezVous.Exceptional_Complete_RendezVous -- to setup Target from Source as an exception to be propagated in the -- caller task. Target is expected to be a pointer to the fixed TSD -- occurrence for this task. ----------------------------- -- Run-Time Check Routines -- ----------------------------- -- These routines raise a specific exception with a reason message -- attached. The parameters are the file name and line number in each -- case. The names are keyed to the codes defined in types.ads and -- a-types.h (for example, the name Rcheck_05 refers to the Reason -- RT_Exception_Code'Val (5)). procedure Rcheck_00 (File : System.Address; Line : Integer); procedure Rcheck_01 (File : System.Address; Line : Integer); procedure Rcheck_02 (File : System.Address; Line : Integer); procedure Rcheck_03 (File : System.Address; Line : Integer); procedure Rcheck_04 (File : System.Address; Line : Integer); procedure Rcheck_05 (File : System.Address; Line : Integer); procedure Rcheck_06 (File : System.Address; Line : Integer); procedure Rcheck_07 (File : System.Address; Line : Integer); procedure Rcheck_08 (File : System.Address; Line : Integer); procedure Rcheck_09 (File : System.Address; Line : Integer); procedure Rcheck_10 (File : System.Address; Line : Integer); procedure Rcheck_11 (File : System.Address; Line : Integer); procedure Rcheck_12 (File : System.Address; Line : Integer); procedure Rcheck_13 (File : System.Address; Line : Integer); procedure Rcheck_14 (File : System.Address; Line : Integer); procedure Rcheck_15 (File : System.Address; Line : Integer); procedure Rcheck_16 (File : System.Address; Line : Integer); procedure Rcheck_17 (File : System.Address; Line : Integer); procedure Rcheck_18 (File : System.Address; Line : Integer); procedure Rcheck_19 (File : System.Address; Line : Integer); procedure Rcheck_20 (File : System.Address; Line : Integer); procedure Rcheck_21 (File : System.Address; Line : Integer); procedure Rcheck_23 (File : System.Address; Line : Integer); procedure Rcheck_24 (File : System.Address; Line : Integer); procedure Rcheck_25 (File : System.Address; Line : Integer); procedure Rcheck_26 (File : System.Address; Line : Integer); procedure Rcheck_27 (File : System.Address; Line : Integer); procedure Rcheck_28 (File : System.Address; Line : Integer); procedure Rcheck_29 (File : System.Address; Line : Integer); procedure Rcheck_30 (File : System.Address; Line : Integer); procedure Rcheck_31 (File : System.Address; Line : Integer); procedure Rcheck_32 (File : System.Address; Line : Integer); procedure Rcheck_33 (File : System.Address; Line : Integer); procedure Rcheck_34 (File : System.Address; Line : Integer); procedure Rcheck_00_Ext (File : System.Address; Line, Column : Integer); procedure Rcheck_05_Ext (File : System.Address; Line, Column, Index, First, Last : Integer); procedure Rcheck_06_Ext (File : System.Address; Line, Column, Index, First, Last : Integer); procedure Rcheck_12_Ext (File : System.Address; Line, Column, Index, First, Last : Integer); procedure Rcheck_22 (File : System.Address; Line : Integer); -- This routine is separated out because it has quite different behavior -- from the others. This is the "finalize/adjust raised exception". This -- subprogram is always called with abort deferred, unlike all other -- Rcheck_* routines, it needs to call Raise_Exception_No_Defer. -- -- It should probably have a distinguished name ??? pragma Export (C, Rcheck_00, "__gnat_rcheck_00"); pragma Export (C, Rcheck_01, "__gnat_rcheck_01"); pragma Export (C, Rcheck_02, "__gnat_rcheck_02"); pragma Export (C, Rcheck_03, "__gnat_rcheck_03"); pragma Export (C, Rcheck_04, "__gnat_rcheck_04"); pragma Export (C, Rcheck_05, "__gnat_rcheck_05"); pragma Export (C, Rcheck_06, "__gnat_rcheck_06"); pragma Export (C, Rcheck_07, "__gnat_rcheck_07"); pragma Export (C, Rcheck_08, "__gnat_rcheck_08"); pragma Export (C, Rcheck_09, "__gnat_rcheck_09"); pragma Export (C, Rcheck_10, "__gnat_rcheck_10"); pragma Export (C, Rcheck_11, "__gnat_rcheck_11"); pragma Export (C, Rcheck_12, "__gnat_rcheck_12"); pragma Export (C, Rcheck_13, "__gnat_rcheck_13"); pragma Export (C, Rcheck_14, "__gnat_rcheck_14"); pragma Export (C, Rcheck_15, "__gnat_rcheck_15"); pragma Export (C, Rcheck_16, "__gnat_rcheck_16"); pragma Export (C, Rcheck_17, "__gnat_rcheck_17"); pragma Export (C, Rcheck_18, "__gnat_rcheck_18"); pragma Export (C, Rcheck_19, "__gnat_rcheck_19"); pragma Export (C, Rcheck_20, "__gnat_rcheck_20"); pragma Export (C, Rcheck_21, "__gnat_rcheck_21"); pragma Export (C, Rcheck_22, "__gnat_rcheck_22"); pragma Export (C, Rcheck_23, "__gnat_rcheck_23"); pragma Export (C, Rcheck_24, "__gnat_rcheck_24"); pragma Export (C, Rcheck_25, "__gnat_rcheck_25"); pragma Export (C, Rcheck_26, "__gnat_rcheck_26"); pragma Export (C, Rcheck_27, "__gnat_rcheck_27"); pragma Export (C, Rcheck_28, "__gnat_rcheck_28"); pragma Export (C, Rcheck_29, "__gnat_rcheck_29"); pragma Export (C, Rcheck_30, "__gnat_rcheck_30"); pragma Export (C, Rcheck_31, "__gnat_rcheck_31"); pragma Export (C, Rcheck_32, "__gnat_rcheck_32"); pragma Export (C, Rcheck_33, "__gnat_rcheck_33"); pragma Export (C, Rcheck_34, "__gnat_rcheck_34"); pragma Export (C, Rcheck_00_Ext, "__gnat_rcheck_00_ext"); pragma Export (C, Rcheck_05_Ext, "__gnat_rcheck_05_ext"); pragma Export (C, Rcheck_06_Ext, "__gnat_rcheck_06_ext"); pragma Export (C, Rcheck_12_Ext, "__gnat_rcheck_12_ext"); -- None of these procedures ever returns (they raise an exception!). By -- using pragma No_Return, we ensure that any junk code after the call, -- such as normal return epilog stuff, can be eliminated). pragma No_Return (Rcheck_00); pragma No_Return (Rcheck_01); pragma No_Return (Rcheck_02); pragma No_Return (Rcheck_03); pragma No_Return (Rcheck_04); pragma No_Return (Rcheck_05); pragma No_Return (Rcheck_06); pragma No_Return (Rcheck_07); pragma No_Return (Rcheck_08); pragma No_Return (Rcheck_09); pragma No_Return (Rcheck_10); pragma No_Return (Rcheck_11); pragma No_Return (Rcheck_12); pragma No_Return (Rcheck_13); pragma No_Return (Rcheck_14); pragma No_Return (Rcheck_15); pragma No_Return (Rcheck_16); pragma No_Return (Rcheck_17); pragma No_Return (Rcheck_18); pragma No_Return (Rcheck_19); pragma No_Return (Rcheck_20); pragma No_Return (Rcheck_21); pragma No_Return (Rcheck_22); pragma No_Return (Rcheck_23); pragma No_Return (Rcheck_24); pragma No_Return (Rcheck_25); pragma No_Return (Rcheck_26); pragma No_Return (Rcheck_27); pragma No_Return (Rcheck_28); pragma No_Return (Rcheck_29); pragma No_Return (Rcheck_30); pragma No_Return (Rcheck_32); pragma No_Return (Rcheck_33); pragma No_Return (Rcheck_34); pragma No_Return (Rcheck_00_Ext); pragma No_Return (Rcheck_05_Ext); pragma No_Return (Rcheck_06_Ext); pragma No_Return (Rcheck_12_Ext); --------------------------------------------- -- Reason Strings for Run-Time Check Calls -- --------------------------------------------- -- These strings are null-terminated and are used by Rcheck_nn. The -- strings correspond to the definitions for Types.RT_Exception_Code. use ASCII; Rmsg_00 : constant String := "access check failed" & NUL; Rmsg_01 : constant String := "access parameter is null" & NUL; Rmsg_02 : constant String := "discriminant check failed" & NUL; Rmsg_03 : constant String := "divide by zero" & NUL; Rmsg_04 : constant String := "explicit raise" & NUL; Rmsg_05 : constant String := "index check failed" & NUL; Rmsg_06 : constant String := "invalid data" & NUL; Rmsg_07 : constant String := "length check failed" & NUL; Rmsg_08 : constant String := "null Exception_Id" & NUL; Rmsg_09 : constant String := "null-exclusion check failed" & NUL; Rmsg_10 : constant String := "overflow check failed" & NUL; Rmsg_11 : constant String := "partition check failed" & NUL; Rmsg_12 : constant String := "range check failed" & NUL; Rmsg_13 : constant String := "tag check failed" & NUL; Rmsg_14 : constant String := "access before elaboration" & NUL; Rmsg_15 : constant String := "accessibility check failed" & NUL; Rmsg_16 : constant String := "attempt to take address of" & " intrinsic subprogram" & NUL; Rmsg_17 : constant String := "all guards closed" & NUL; Rmsg_18 : constant String := "improper use of generic subtype" & " with predicate" & NUL; Rmsg_19 : constant String := "Current_Task referenced in entry" & " body" & NUL; Rmsg_20 : constant String := "duplicated entry address" & NUL; Rmsg_21 : constant String := "explicit raise" & NUL; Rmsg_22 : constant String := "finalize/adjust raised exception" & NUL; Rmsg_23 : constant String := "implicit return with No_Return" & NUL; Rmsg_24 : constant String := "misaligned address value" & NUL; Rmsg_25 : constant String := "missing return" & NUL; Rmsg_26 : constant String := "overlaid controlled object" & NUL; Rmsg_27 : constant String := "potentially blocking operation" & NUL; Rmsg_28 : constant String := "stubbed subprogram called" & NUL; Rmsg_29 : constant String := "unchecked union restriction" & NUL; Rmsg_30 : constant String := "actual/returned class-wide" & " value not transportable" & NUL; Rmsg_31 : constant String := "empty storage pool" & NUL; Rmsg_32 : constant String := "explicit raise" & NUL; Rmsg_33 : constant String := "infinite recursion" & NUL; Rmsg_34 : constant String := "object too large" & NUL; ----------------------- -- Polling Interface -- ----------------------- type Unsigned is mod 2 ** 32; Counter : Unsigned := 0; pragma Warnings (Off, Counter); -- This counter is provided for convenience. It can be used in Poll to -- perform periodic but not systematic operations. procedure Poll is separate; -- The actual polling routine is separate, so that it can easily -- be replaced with a target dependent version. -------------------------- -- Code_Address_For_AAA -- -------------------------- -- This function gives us the start of the PC range for addresses -- within the exception unit itself. We hope that gigi/gcc keep all the -- procedures in their original order! function Code_Address_For_AAA return System.Address is begin -- We are using a label instead of merely using -- Code_Address_For_AAA'Address because on some platforms the latter -- does not yield the address we want, but the address of a stub or of -- a descriptor instead. This is the case at least on Alpha-VMS and -- PA-HPUX. <<Start_Of_AAA>> return Start_Of_AAA'Address; end Code_Address_For_AAA; ---------------- -- Call_Chain -- ---------------- procedure Call_Chain (Excep : EOA) is separate; -- The actual Call_Chain routine is separate, so that it can easily -- be dummied out when no exception traceback information is needed. ------------------------------ -- Current_Target_Exception -- ------------------------------ function Current_Target_Exception return Exception_Occurrence is begin return Null_Occurrence; end Current_Target_Exception; ------------------- -- EId_To_String -- ------------------- function EId_To_String (X : Exception_Id) return String renames Stream_Attributes.EId_To_String; ------------------ -- EO_To_String -- ------------------ -- We use the null string to represent the null occurrence, otherwise -- we output the Exception_Information string for the occurrence. function EO_To_String (X : Exception_Occurrence) return String renames Stream_Attributes.EO_To_String; ------------------------ -- Exception_Identity -- ------------------------ function Exception_Identity (X : Exception_Occurrence) return Exception_Id is begin -- Note that the following test used to be here for the original -- Ada 95 semantics, but these were modified by AI-241 to require -- returning Null_Id instead of raising Constraint_Error. -- if X.Id = Null_Id then -- raise Constraint_Error; -- end if; return X.Id; end Exception_Identity; --------------------------- -- Exception_Information -- --------------------------- function Exception_Information (X : Exception_Occurrence) return String is begin if X.Id = Null_Id then raise Constraint_Error; end if; return Exception_Data.Exception_Information (X); end Exception_Information; ----------------------- -- Exception_Message -- ----------------------- function Exception_Message (X : Exception_Occurrence) return String is begin if X.Id = Null_Id then raise Constraint_Error; end if; return X.Msg (1 .. X.Msg_Length); end Exception_Message; -------------------- -- Exception_Name -- -------------------- function Exception_Name (Id : Exception_Id) return String is begin if Id = null then raise Constraint_Error; end if; return To_Ptr (Id.Full_Name) (1 .. Id.Name_Length - 1); end Exception_Name; function Exception_Name (X : Exception_Occurrence) return String is begin return Exception_Name (X.Id); end Exception_Name; --------------------------- -- Exception_Name_Simple -- --------------------------- function Exception_Name_Simple (X : Exception_Occurrence) return String is Name : constant String := Exception_Name (X); P : Natural; begin P := Name'Length; while P > 1 loop exit when Name (P - 1) = '.'; P := P - 1; end loop; -- Return result making sure lower bound is 1 declare subtype Rname is String (1 .. Name'Length - P + 1); begin return Rname (Name (P .. Name'Length)); end; end Exception_Name_Simple; -------------------- -- Exception_Data -- -------------------- package body Exception_Data is separate; -- This package can be easily dummied out if we do not want the -- basic support for exception messages (such as in Ada 83). --------------------------- -- Exception_Propagation -- --------------------------- package body Exception_Propagation is separate; -- Depending on the actual exception mechanism used (front-end or -- back-end based), the implementation will differ, which is why this -- package is separated. ---------------------- -- Exception_Traces -- ---------------------- package body Exception_Traces is separate; -- Depending on the underlying support for IO the implementation -- will differ. Moreover we would like to dummy out this package -- in case we do not want any exception tracing support. This is -- why this package is separated. ----------- -- Image -- ----------- function Image (Index : Integer) return String is Result : constant String := Integer'Image (Index); begin if Result (1) = ' ' then return Result (2 .. Result'Last); else return Result; end if; end Image; ----------------------- -- Stream Attributes -- ----------------------- package body Stream_Attributes is separate; -- This package can be easily dummied out if we do not want the -- support for streaming Exception_Ids and Exception_Occurrences. ---------------------------- -- Raise_Constraint_Error -- ---------------------------- procedure Raise_Constraint_Error (File : System.Address; Line : Integer) is begin Raise_With_Location_And_Msg (Constraint_Error_Def'Access, File, Line); end Raise_Constraint_Error; -------------------------------- -- Raise_Constraint_Error_Msg -- -------------------------------- procedure Raise_Constraint_Error_Msg (File : System.Address; Line : Integer; Column : Integer; Msg : System.Address) is begin Raise_With_Location_And_Msg (Constraint_Error_Def'Access, File, Line, Column, Msg); end Raise_Constraint_Error_Msg; ------------------------- -- Raise_Current_Excep -- ------------------------- procedure Raise_Current_Excep (E : Exception_Id) is begin Debug_Raise_Exception (E => SSL.Exception_Data_Ptr (E)); Exception_Propagation.Propagate_Exception; end Raise_Current_Excep; --------------------- -- Raise_Exception -- --------------------- procedure Raise_Exception (E : Exception_Id; Message : String := "") is EF : Exception_Id := E; begin -- Raise CE if E = Null_ID (AI-446) if E = null then EF := Constraint_Error'Identity; end if; -- Go ahead and raise appropriate exception Exception_Data.Set_Exception_Msg (EF, Message); if not ZCX_By_Default then Abort_Defer.all; end if; Raise_Current_Excep (EF); end Raise_Exception; ---------------------------- -- Raise_Exception_Always -- ---------------------------- procedure Raise_Exception_Always (E : Exception_Id; Message : String := "") is begin Exception_Data.Set_Exception_Msg (E, Message); if not ZCX_By_Default then Abort_Defer.all; end if; Raise_Current_Excep (E); end Raise_Exception_Always; ------------------------------ -- Raise_Exception_No_Defer -- ------------------------------ procedure Raise_Exception_No_Defer (E : Exception_Id; Message : String := "") is begin Exception_Data.Set_Exception_Msg (E, Message); -- Do not call Abort_Defer.all, as specified by the spec Raise_Current_Excep (E); end Raise_Exception_No_Defer; ------------------------------------- -- Raise_From_Controlled_Operation -- ------------------------------------- procedure Raise_From_Controlled_Operation (X : Ada.Exceptions.Exception_Occurrence) is Prefix : constant String := "adjust/finalize raised "; Orig_Msg : constant String := Exception_Message (X); Orig_Prefix_Length : constant Natural := Integer'Min (Prefix'Length, Orig_Msg'Length); Orig_Prefix : String renames Orig_Msg (Orig_Msg'First .. Orig_Msg'First + Orig_Prefix_Length - 1); begin -- Message already has the proper prefix, just re-raise if Orig_Prefix = Prefix then Raise_Exception_No_Defer (E => Program_Error'Identity, Message => Orig_Msg); else declare New_Msg : constant String := Prefix & Exception_Name (X); begin -- No message present, just provide our own if Orig_Msg = "" then Raise_Exception_No_Defer (E => Program_Error'Identity, Message => New_Msg); -- Message present, add informational prefix else Raise_Exception_No_Defer (E => Program_Error'Identity, Message => New_Msg & ": " & Orig_Msg); end if; end; end if; end Raise_From_Controlled_Operation; ------------------------------- -- Raise_From_Signal_Handler -- ------------------------------- procedure Raise_From_Signal_Handler (E : Exception_Id; M : System.Address) is begin Exception_Data.Set_Exception_C_Msg (E, M); if not ZCX_By_Default then Abort_Defer.all; end if; Raise_Current_Excep (E); end Raise_From_Signal_Handler; ------------------------- -- Raise_Program_Error -- ------------------------- procedure Raise_Program_Error (File : System.Address; Line : Integer) is begin Raise_With_Location_And_Msg (Program_Error_Def'Access, File, Line); end Raise_Program_Error; ----------------------------- -- Raise_Program_Error_Msg -- ----------------------------- procedure Raise_Program_Error_Msg (File : System.Address; Line : Integer; Msg : System.Address) is begin Raise_With_Location_And_Msg (Program_Error_Def'Access, File, Line, M => Msg); end Raise_Program_Error_Msg; ------------------------- -- Raise_Storage_Error -- ------------------------- procedure Raise_Storage_Error (File : System.Address; Line : Integer) is begin Raise_With_Location_And_Msg (Storage_Error_Def'Access, File, Line); end Raise_Storage_Error; ----------------------------- -- Raise_Storage_Error_Msg -- ----------------------------- procedure Raise_Storage_Error_Msg (File : System.Address; Line : Integer; Msg : System.Address) is begin Raise_With_Location_And_Msg (Storage_Error_Def'Access, File, Line, M => Msg); end Raise_Storage_Error_Msg; --------------------------------- -- Raise_With_Location_And_Msg -- --------------------------------- procedure Raise_With_Location_And_Msg (E : Exception_Id; F : System.Address; L : Integer; C : Integer := 0; M : System.Address := System.Null_Address) is begin Exception_Data.Set_Exception_C_Msg (E, F, L, C, M); if not ZCX_By_Default then Abort_Defer.all; end if; Raise_Current_Excep (E); end Raise_With_Location_And_Msg; -------------------- -- Raise_With_Msg -- -------------------- procedure Raise_With_Msg (E : Exception_Id) is Excep : constant EOA := Get_Current_Excep.all; begin Excep.Exception_Raised := False; Excep.Id := E; Excep.Num_Tracebacks := 0; Excep.Pid := Local_Partition_ID; -- The following is a common pattern, should be abstracted -- into a procedure call ??? if not ZCX_By_Default then Abort_Defer.all; end if; Raise_Current_Excep (E); end Raise_With_Msg; -------------------------------------- -- Calls to Run-Time Check Routines -- -------------------------------------- procedure Rcheck_00 (File : System.Address; Line : Integer) is begin Raise_Constraint_Error_Msg (File, Line, 0, Rmsg_00'Address); end Rcheck_00; procedure Rcheck_01 (File : System.Address; Line : Integer) is begin Raise_Constraint_Error_Msg (File, Line, 0, Rmsg_01'Address); end Rcheck_01; procedure Rcheck_02 (File : System.Address; Line : Integer) is begin Raise_Constraint_Error_Msg (File, Line, 0, Rmsg_02'Address); end Rcheck_02; procedure Rcheck_03 (File : System.Address; Line : Integer) is begin Raise_Constraint_Error_Msg (File, Line, 0, Rmsg_03'Address); end Rcheck_03; procedure Rcheck_04 (File : System.Address; Line : Integer) is begin Raise_Constraint_Error_Msg (File, Line, 0, Rmsg_04'Address); end Rcheck_04; procedure Rcheck_05 (File : System.Address; Line : Integer) is begin Raise_Constraint_Error_Msg (File, Line, 0, Rmsg_05'Address); end Rcheck_05; procedure Rcheck_06 (File : System.Address; Line : Integer) is begin Raise_Constraint_Error_Msg (File, Line, 0, Rmsg_06'Address); end Rcheck_06; procedure Rcheck_07 (File : System.Address; Line : Integer) is begin Raise_Constraint_Error_Msg (File, Line, 0, Rmsg_07'Address); end Rcheck_07; procedure Rcheck_08 (File : System.Address; Line : Integer) is begin Raise_Constraint_Error_Msg (File, Line, 0, Rmsg_08'Address); end Rcheck_08; procedure Rcheck_09 (File : System.Address; Line : Integer) is begin Raise_Constraint_Error_Msg (File, Line, 0, Rmsg_09'Address); end Rcheck_09; procedure Rcheck_10 (File : System.Address; Line : Integer) is begin Raise_Constraint_Error_Msg (File, Line, 0, Rmsg_10'Address); end Rcheck_10; procedure Rcheck_11 (File : System.Address; Line : Integer) is begin Raise_Constraint_Error_Msg (File, Line, 0, Rmsg_11'Address); end Rcheck_11; procedure Rcheck_12 (File : System.Address; Line : Integer) is begin Raise_Constraint_Error_Msg (File, Line, 0, Rmsg_12'Address); end Rcheck_12; procedure Rcheck_13 (File : System.Address; Line : Integer) is begin Raise_Constraint_Error_Msg (File, Line, 0, Rmsg_13'Address); end Rcheck_13; procedure Rcheck_14 (File : System.Address; Line : Integer) is begin Raise_Program_Error_Msg (File, Line, Rmsg_14'Address); end Rcheck_14; procedure Rcheck_15 (File : System.Address; Line : Integer) is begin Raise_Program_Error_Msg (File, Line, Rmsg_15'Address); end Rcheck_15; procedure Rcheck_16 (File : System.Address; Line : Integer) is begin Raise_Program_Error_Msg (File, Line, Rmsg_16'Address); end Rcheck_16; procedure Rcheck_17 (File : System.Address; Line : Integer) is begin Raise_Program_Error_Msg (File, Line, Rmsg_17'Address); end Rcheck_17; procedure Rcheck_18 (File : System.Address; Line : Integer) is begin Raise_Program_Error_Msg (File, Line, Rmsg_18'Address); end Rcheck_18; procedure Rcheck_19 (File : System.Address; Line : Integer) is begin Raise_Program_Error_Msg (File, Line, Rmsg_19'Address); end Rcheck_19; procedure Rcheck_20 (File : System.Address; Line : Integer) is begin Raise_Program_Error_Msg (File, Line, Rmsg_20'Address); end Rcheck_20; procedure Rcheck_21 (File : System.Address; Line : Integer) is begin Raise_Program_Error_Msg (File, Line, Rmsg_21'Address); end Rcheck_21; procedure Rcheck_23 (File : System.Address; Line : Integer) is begin Raise_Program_Error_Msg (File, Line, Rmsg_23'Address); end Rcheck_23; procedure Rcheck_24 (File : System.Address; Line : Integer) is begin Raise_Program_Error_Msg (File, Line, Rmsg_24'Address); end Rcheck_24; procedure Rcheck_25 (File : System.Address; Line : Integer) is begin Raise_Program_Error_Msg (File, Line, Rmsg_25'Address); end Rcheck_25; procedure Rcheck_26 (File : System.Address; Line : Integer) is begin Raise_Program_Error_Msg (File, Line, Rmsg_26'Address); end Rcheck_26; procedure Rcheck_27 (File : System.Address; Line : Integer) is begin Raise_Program_Error_Msg (File, Line, Rmsg_27'Address); end Rcheck_27; procedure Rcheck_28 (File : System.Address; Line : Integer) is begin Raise_Program_Error_Msg (File, Line, Rmsg_28'Address); end Rcheck_28; procedure Rcheck_29 (File : System.Address; Line : Integer) is begin Raise_Program_Error_Msg (File, Line, Rmsg_29'Address); end Rcheck_29; procedure Rcheck_30 (File : System.Address; Line : Integer) is begin Raise_Program_Error_Msg (File, Line, Rmsg_30'Address); end Rcheck_30; procedure Rcheck_31 (File : System.Address; Line : Integer) is begin Raise_Storage_Error_Msg (File, Line, Rmsg_31'Address); end Rcheck_31; procedure Rcheck_32 (File : System.Address; Line : Integer) is begin Raise_Storage_Error_Msg (File, Line, Rmsg_32'Address); end Rcheck_32; procedure Rcheck_33 (File : System.Address; Line : Integer) is begin Raise_Storage_Error_Msg (File, Line, Rmsg_33'Address); end Rcheck_33; procedure Rcheck_34 (File : System.Address; Line : Integer) is begin Raise_Storage_Error_Msg (File, Line, Rmsg_34'Address); end Rcheck_34; procedure Rcheck_00_Ext (File : System.Address; Line, Column : Integer) is begin Raise_Constraint_Error_Msg (File, Line, Column, Rmsg_00'Address); end Rcheck_00_Ext; procedure Rcheck_05_Ext (File : System.Address; Line, Column, Index, First, Last : Integer) is Msg : constant String := Rmsg_05 (Rmsg_05'First .. Rmsg_05'Last - 1) & ASCII.LF & "index " & Image (Index) & " not in " & Image (First) & ".." & Image (Last) & ASCII.NUL; begin Raise_Constraint_Error_Msg (File, Line, Column, Msg'Address); end Rcheck_05_Ext; procedure Rcheck_06_Ext (File : System.Address; Line, Column, Index, First, Last : Integer) is Msg : constant String := Rmsg_06 (Rmsg_06'First .. Rmsg_06'Last - 1) & ASCII.LF & "value " & Image (Index) & " not in " & Image (First) & ".." & Image (Last) & ASCII.NUL; begin Raise_Constraint_Error_Msg (File, Line, Column, Msg'Address); end Rcheck_06_Ext; procedure Rcheck_12_Ext (File : System.Address; Line, Column, Index, First, Last : Integer) is Msg : constant String := Rmsg_12 (Rmsg_12'First .. Rmsg_12'Last - 1) & ASCII.LF & "value " & Image (Index) & " not in " & Image (First) & ".." & Image (Last) & ASCII.NUL; begin Raise_Constraint_Error_Msg (File, Line, Column, Msg'Address); end Rcheck_12_Ext; --------------- -- Rcheck_22 -- --------------- procedure Rcheck_22 (File : System.Address; Line : Integer) is E : constant Exception_Id := Program_Error_Def'Access; begin -- This is "finalize/adjust raised exception". This subprogram is always -- called with abort deferred, unlike all other Rcheck_* routines, it -- needs to call Raise_Exception_No_Defer. -- This is consistent with Raise_From_Controlled_Operation Exception_Data.Set_Exception_C_Msg (E, File, Line, 0, Rmsg_22'Address); Raise_Current_Excep (E); end Rcheck_22; ------------- -- Reraise -- ------------- procedure Reraise is Excep : constant EOA := Get_Current_Excep.all; begin if not ZCX_By_Default then Abort_Defer.all; end if; Raise_Current_Excep (Excep.Id); end Reraise; ------------------------ -- Reraise_Occurrence -- ------------------------ procedure Reraise_Occurrence (X : Exception_Occurrence) is begin if X.Id /= null then if not ZCX_By_Default then Abort_Defer.all; end if; Save_Occurrence (Get_Current_Excep.all.all, X); Raise_Current_Excep (X.Id); end if; end Reraise_Occurrence; ------------------------------- -- Reraise_Occurrence_Always -- ------------------------------- procedure Reraise_Occurrence_Always (X : Exception_Occurrence) is begin if not ZCX_By_Default then Abort_Defer.all; end if; Save_Occurrence (Get_Current_Excep.all.all, X); Raise_Current_Excep (X.Id); end Reraise_Occurrence_Always; --------------------------------- -- Reraise_Occurrence_No_Defer -- --------------------------------- procedure Reraise_Occurrence_No_Defer (X : Exception_Occurrence) is begin Save_Occurrence (Get_Current_Excep.all.all, X); Raise_Current_Excep (X.Id); end Reraise_Occurrence_No_Defer; --------------------- -- Save_Occurrence -- --------------------- procedure Save_Occurrence (Target : out Exception_Occurrence; Source : Exception_Occurrence) is begin Target.Id := Source.Id; Target.Msg_Length := Source.Msg_Length; Target.Num_Tracebacks := Source.Num_Tracebacks; Target.Pid := Source.Pid; Target.Msg (1 .. Target.Msg_Length) := Source.Msg (1 .. Target.Msg_Length); Target.Tracebacks (1 .. Target.Num_Tracebacks) := Source.Tracebacks (1 .. Target.Num_Tracebacks); end Save_Occurrence; function Save_Occurrence (Source : Exception_Occurrence) return EOA is Target : constant EOA := new Exception_Occurrence; begin Save_Occurrence (Target.all, Source); return Target; end Save_Occurrence; ------------------- -- String_To_EId -- ------------------- function String_To_EId (S : String) return Exception_Id renames Stream_Attributes.String_To_EId; ------------------ -- String_To_EO -- ------------------ function String_To_EO (S : String) return Exception_Occurrence renames Stream_Attributes.String_To_EO; --------------- -- To_Stderr -- --------------- procedure To_Stderr (C : Character) is type int is new Integer; procedure put_char_stderr (C : int); pragma Import (C, put_char_stderr, "put_char_stderr"); begin put_char_stderr (Character'Pos (C)); end To_Stderr; procedure To_Stderr (S : String) is begin for J in S'Range loop if S (J) /= ASCII.CR then To_Stderr (S (J)); end if; end loop; end To_Stderr; ------------------------- -- Transfer_Occurrence -- ------------------------- procedure Transfer_Occurrence (Target : Exception_Occurrence_Access; Source : Exception_Occurrence) is begin Save_Occurrence (Target.all, Source); end Transfer_Occurrence; ------------------------ -- Triggered_By_Abort -- ------------------------ function Triggered_By_Abort return Boolean is Ex : constant Exception_Occurrence_Access := Get_Current_Excep.all; begin return Ex /= null and then Exception_Identity (Ex.all) = Standard'Abort_Signal'Identity; end Triggered_By_Abort; ------------------------- -- Wide_Exception_Name -- ------------------------- WC_Encoding : Character; pragma Import (C, WC_Encoding, "__gl_wc_encoding"); -- Encoding method for source, as exported by binder function Wide_Exception_Name (Id : Exception_Id) return Wide_String is S : constant String := Exception_Name (Id); W : Wide_String (1 .. S'Length); L : Natural; begin String_To_Wide_String (S, W, L, Get_WC_Encoding_Method (WC_Encoding)); return W (1 .. L); end Wide_Exception_Name; function Wide_Exception_Name (X : Exception_Occurrence) return Wide_String is S : constant String := Exception_Name (X); W : Wide_String (1 .. S'Length); L : Natural; begin String_To_Wide_String (S, W, L, Get_WC_Encoding_Method (WC_Encoding)); return W (1 .. L); end Wide_Exception_Name; ---------------------------- -- Wide_Wide_Exception_Name -- ----------------------------- function Wide_Wide_Exception_Name (Id : Exception_Id) return Wide_Wide_String is S : constant String := Exception_Name (Id); W : Wide_Wide_String (1 .. S'Length); L : Natural; begin String_To_Wide_Wide_String (S, W, L, Get_WC_Encoding_Method (WC_Encoding)); return W (1 .. L); end Wide_Wide_Exception_Name; function Wide_Wide_Exception_Name (X : Exception_Occurrence) return Wide_Wide_String is S : constant String := Exception_Name (X); W : Wide_Wide_String (1 .. S'Length); L : Natural; begin String_To_Wide_Wide_String (S, W, L, Get_WC_Encoding_Method (WC_Encoding)); return W (1 .. L); end Wide_Wide_Exception_Name; -------------------------- -- Code_Address_For_ZZZ -- -------------------------- -- This function gives us the end of the PC range for addresses -- within the exception unit itself. We hope that gigi/gcc keeps all the -- procedures in their original order! function Code_Address_For_ZZZ return System.Address is begin <<Start_Of_ZZZ>> return Start_Of_ZZZ'Address; end Code_Address_For_ZZZ; end Ada.Exceptions;
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