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Diffstat (limited to 'gcc/ada/a-exexpr.adb')
| -rw-r--r-- | gcc/ada/a-exexpr.adb | 439 |
1 files changed, 0 insertions, 439 deletions
diff --git a/gcc/ada/a-exexpr.adb b/gcc/ada/a-exexpr.adb deleted file mode 100644 index 91fb5f5..0000000 --- a/gcc/ada/a-exexpr.adb +++ /dev/null @@ -1,439 +0,0 @@ ------------------------------------------------------------------------------- --- -- --- GNAT COMPILER COMPONENTS -- --- -- --- A D A . E X C E P T I O N S . E X C E P T I O N _ P R O P A G A T I O N -- --- -- --- B o d y -- --- -- --- Copyright (C) 1992-2016, 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 is the version using the GCC EH mechanism - -with Ada.Unchecked_Conversion; -with Ada.Unchecked_Deallocation; - -with System.Storage_Elements; use System.Storage_Elements; -with System.Exceptions.Machine; use System.Exceptions.Machine; - -separate (Ada.Exceptions) -package body Exception_Propagation is - - use Exception_Traces; - - Foreign_Exception : aliased System.Standard_Library.Exception_Data; - pragma Import (Ada, Foreign_Exception, - "system__exceptions__foreign_exception"); - -- Id for foreign exceptions - - -------------------------------------------------------------- - -- GNAT Specific Entities To Deal With The GCC EH Circuitry -- - -------------------------------------------------------------- - - procedure GNAT_GCC_Exception_Cleanup - (Reason : Unwind_Reason_Code; - Excep : not null GNAT_GCC_Exception_Access); - pragma Convention (C, GNAT_GCC_Exception_Cleanup); - -- Procedure called when a GNAT GCC exception is free. - - procedure Propagate_GCC_Exception - (GCC_Exception : not null GCC_Exception_Access); - pragma No_Return (Propagate_GCC_Exception); - -- Propagate a GCC exception - - procedure Reraise_GCC_Exception - (GCC_Exception : not null GCC_Exception_Access); - pragma No_Return (Reraise_GCC_Exception); - pragma Export (C, Reraise_GCC_Exception, "__gnat_reraise_zcx"); - -- Called to implement raise without exception, ie reraise. Called - -- directly from gigi. - - function Setup_Current_Excep - (GCC_Exception : not null GCC_Exception_Access) return EOA; - pragma Export (C, Setup_Current_Excep, "__gnat_setup_current_excep"); - -- Write Get_Current_Excep.all from GCC_Exception. Called by the - -- personality routine. - - procedure Unhandled_Except_Handler - (GCC_Exception : not null GCC_Exception_Access); - pragma No_Return (Unhandled_Except_Handler); - pragma Export (C, Unhandled_Except_Handler, - "__gnat_unhandled_except_handler"); - -- Called for handle unhandled exceptions, ie the last chance handler - -- on platforms (such as SEH) that never returns after throwing an - -- exception. Called directly by gigi. - - function CleanupUnwind_Handler - (UW_Version : Integer; - UW_Phases : Unwind_Action; - UW_Eclass : Exception_Class; - UW_Exception : not null GCC_Exception_Access; - UW_Context : System.Address; - UW_Argument : System.Address) return Unwind_Reason_Code; - pragma Import (C, CleanupUnwind_Handler, - "__gnat_cleanupunwind_handler"); - -- Hook called at each step of the forced unwinding we perform to trigger - -- cleanups found during the propagation of an unhandled exception. - - -- GCC runtime functions used. These are C non-void functions, actually, - -- but we ignore the return values. See raise.c as to why we are using - -- __gnat stubs for these. - - procedure Unwind_RaiseException - (UW_Exception : not null GCC_Exception_Access); - pragma Import (C, Unwind_RaiseException, "__gnat_Unwind_RaiseException"); - - procedure Unwind_ForcedUnwind - (UW_Exception : not null GCC_Exception_Access; - UW_Handler : System.Address; - UW_Argument : System.Address); - pragma Import (C, Unwind_ForcedUnwind, "__gnat_Unwind_ForcedUnwind"); - - procedure Set_Exception_Parameter - (Excep : EOA; - GCC_Exception : not null GCC_Exception_Access); - pragma Export - (C, Set_Exception_Parameter, "__gnat_set_exception_parameter"); - -- Called inserted by gigi to set the exception choice parameter from the - -- gcc occurrence. - - procedure Set_Foreign_Occurrence (Excep : EOA; Mo : System.Address); - -- Utility routine to initialize occurrence Excep from a foreign exception - -- whose machine occurrence is Mo. The message is empty, the backtrace - -- is empty too and the exception identity is Foreign_Exception. - - -- Hooks called when entering/leaving an exception handler for a given - -- occurrence, aimed at handling the stack of active occurrences. The - -- calls are generated by gigi in tree_transform/N_Exception_Handler. - - procedure Begin_Handler (GCC_Exception : not null GCC_Exception_Access); - pragma Export (C, Begin_Handler, "__gnat_begin_handler"); - - procedure End_Handler (GCC_Exception : GCC_Exception_Access); - pragma Export (C, End_Handler, "__gnat_end_handler"); - - -------------------------------------------------------------------- - -- Accessors to Basic Components of a GNAT Exception Data Pointer -- - -------------------------------------------------------------------- - - -- As of today, these are only used by the C implementation of the GCC - -- propagation personality routine to avoid having to rely on a C - -- counterpart of the whole exception_data structure, which is both - -- painful and error prone. These subprograms could be moved to a more - -- widely visible location if need be. - - function Is_Handled_By_Others (E : Exception_Data_Ptr) return Boolean; - pragma Export (C, Is_Handled_By_Others, "__gnat_is_handled_by_others"); - pragma Warnings (Off, Is_Handled_By_Others); - - function Language_For (E : Exception_Data_Ptr) return Character; - pragma Export (C, Language_For, "__gnat_language_for"); - - function Foreign_Data_For (E : Exception_Data_Ptr) return Address; - pragma Export (C, Foreign_Data_For, "__gnat_foreign_data_for"); - - function EID_For (GNAT_Exception : not null GNAT_GCC_Exception_Access) - return Exception_Id; - pragma Export (C, EID_For, "__gnat_eid_for"); - - --------------------------------------------------------------------------- - -- Objects to materialize "others" and "all others" in the GCC EH tables -- - --------------------------------------------------------------------------- - - -- Currently, these only have their address taken and compared so there is - -- no real point having whole exception data blocks allocated. Note that - -- there are corresponding declarations in gigi (trans.c) which must be - -- kept properly synchronized. - - Others_Value : constant Character := 'O'; - pragma Export (C, Others_Value, "__gnat_others_value"); - - All_Others_Value : constant Character := 'A'; - pragma Export (C, All_Others_Value, "__gnat_all_others_value"); - - Unhandled_Others_Value : constant Character := 'U'; - pragma Export (C, Unhandled_Others_Value, "__gnat_unhandled_others_value"); - -- Special choice (emitted by gigi) to catch and notify unhandled - -- exceptions on targets which always handle exceptions (such as SEH). - -- The handler will simply call Unhandled_Except_Handler. - - ------------------------- - -- Allocate_Occurrence -- - ------------------------- - - function Allocate_Occurrence return EOA is - Res : GNAT_GCC_Exception_Access; - - begin - Res := New_Occurrence; - Res.Header.Cleanup := GNAT_GCC_Exception_Cleanup'Address; - Res.Occurrence.Machine_Occurrence := Res.all'Address; - - return Res.Occurrence'Access; - end Allocate_Occurrence; - - -------------------------------- - -- GNAT_GCC_Exception_Cleanup -- - -------------------------------- - - procedure GNAT_GCC_Exception_Cleanup - (Reason : Unwind_Reason_Code; - Excep : not null GNAT_GCC_Exception_Access) - is - pragma Unreferenced (Reason); - - procedure Free is new Unchecked_Deallocation - (GNAT_GCC_Exception, GNAT_GCC_Exception_Access); - - Copy : GNAT_GCC_Exception_Access := Excep; - - begin - -- Simply free the memory - - Free (Copy); - end GNAT_GCC_Exception_Cleanup; - - ---------------------------- - -- Set_Foreign_Occurrence -- - ---------------------------- - - procedure Set_Foreign_Occurrence (Excep : EOA; Mo : System.Address) is - begin - Excep.all := ( - Id => Foreign_Exception'Access, - Machine_Occurrence => Mo, - Msg => <>, - Msg_Length => 0, - Exception_Raised => True, - Pid => Local_Partition_ID, - Num_Tracebacks => 0, - Tracebacks => <>); - end Set_Foreign_Occurrence; - - ------------------------- - -- Setup_Current_Excep -- - ------------------------- - - function Setup_Current_Excep - (GCC_Exception : not null GCC_Exception_Access) return EOA - is - Excep : constant EOA := Get_Current_Excep.all; - - begin - -- Setup the exception occurrence - - if GCC_Exception.Class = GNAT_Exception_Class then - - -- From the GCC exception - - declare - GNAT_Occurrence : constant GNAT_GCC_Exception_Access := - To_GNAT_GCC_Exception (GCC_Exception); - begin - Excep.all := GNAT_Occurrence.Occurrence; - return GNAT_Occurrence.Occurrence'Access; - end; - - else - -- A default one - - Set_Foreign_Occurrence (Excep, GCC_Exception.all'Address); - - return Excep; - end if; - end Setup_Current_Excep; - - ------------------- - -- Begin_Handler -- - ------------------- - - procedure Begin_Handler (GCC_Exception : not null GCC_Exception_Access) is - pragma Unreferenced (GCC_Exception); - begin - null; - end Begin_Handler; - - ----------------- - -- End_Handler -- - ----------------- - - procedure End_Handler (GCC_Exception : GCC_Exception_Access) is - begin - if GCC_Exception /= null then - - -- The exception might have been reraised, in this case the cleanup - -- mustn't be called. - - Unwind_DeleteException (GCC_Exception); - end if; - end End_Handler; - - ----------------------------- - -- Reraise_GCC_Exception -- - ----------------------------- - - procedure Reraise_GCC_Exception - (GCC_Exception : not null GCC_Exception_Access) - is - begin - -- Simply propagate it - - Propagate_GCC_Exception (GCC_Exception); - end Reraise_GCC_Exception; - - ----------------------------- - -- Propagate_GCC_Exception -- - ----------------------------- - - -- Call Unwind_RaiseException to actually throw, taking care of handling - -- the two phase scheme it implements. - - procedure Propagate_GCC_Exception - (GCC_Exception : not null GCC_Exception_Access) - is - Excep : EOA; - - begin - -- Perform a standard raise first. If a regular handler is found, it - -- will be entered after all the intermediate cleanups have run. If - -- there is no regular handler, it will return. - - Unwind_RaiseException (GCC_Exception); - - -- If we get here we know the exception is not handled, as otherwise - -- Unwind_RaiseException arranges for the handler to be entered. Take - -- the necessary steps to enable the debugger to gain control while the - -- stack is still intact. - - Excep := Setup_Current_Excep (GCC_Exception); - Notify_Unhandled_Exception (Excep); - - -- Now, un a forced unwind to trigger cleanups. Control should not - -- resume there, if there are cleanups and in any cases as the - -- unwinding hook calls Unhandled_Exception_Terminate when end of - -- stack is reached. - - Unwind_ForcedUnwind - (GCC_Exception, - CleanupUnwind_Handler'Address, - System.Null_Address); - - -- We get here in case of error. The debugger has been notified before - -- the second step above. - - Unhandled_Except_Handler (GCC_Exception); - end Propagate_GCC_Exception; - - ------------------------- - -- Propagate_Exception -- - ------------------------- - - procedure Propagate_Exception (Excep : EOA) is - begin - Propagate_GCC_Exception (To_GCC_Exception (Excep.Machine_Occurrence)); - end Propagate_Exception; - - ----------------------------- - -- Set_Exception_Parameter -- - ----------------------------- - - procedure Set_Exception_Parameter - (Excep : EOA; - GCC_Exception : not null GCC_Exception_Access) - is - begin - -- Setup the exception occurrence - - if GCC_Exception.Class = GNAT_Exception_Class then - - -- From the GCC exception - - declare - GNAT_Occurrence : constant GNAT_GCC_Exception_Access := - To_GNAT_GCC_Exception (GCC_Exception); - begin - Save_Occurrence (Excep.all, GNAT_Occurrence.Occurrence); - end; - - else - -- A default one - - Set_Foreign_Occurrence (Excep, GCC_Exception.all'Address); - end if; - end Set_Exception_Parameter; - - ------------------------------ - -- Unhandled_Except_Handler -- - ------------------------------ - - procedure Unhandled_Except_Handler - (GCC_Exception : not null GCC_Exception_Access) - is - Excep : EOA; - begin - Excep := Setup_Current_Excep (GCC_Exception); - Unhandled_Exception_Terminate (Excep); - end Unhandled_Except_Handler; - - ------------- - -- EID_For -- - ------------- - - function EID_For - (GNAT_Exception : not null GNAT_GCC_Exception_Access) return Exception_Id - is - begin - return GNAT_Exception.Occurrence.Id; - end EID_For; - - ---------------------- - -- Foreign_Data_For -- - ---------------------- - - function Foreign_Data_For - (E : SSL.Exception_Data_Ptr) return Address - is - begin - return E.Foreign_Data; - end Foreign_Data_For; - - -------------------------- - -- Is_Handled_By_Others -- - -------------------------- - - function Is_Handled_By_Others (E : SSL.Exception_Data_Ptr) return Boolean is - begin - return not E.all.Not_Handled_By_Others; - end Is_Handled_By_Others; - - ------------------ - -- Language_For -- - ------------------ - - function Language_For (E : SSL.Exception_Data_Ptr) return Character is - begin - return E.all.Lang; - end Language_For; - -end Exception_Propagation; |