X-Git-Url: https://oss.titaniummirror.com/gitweb?a=blobdiff_plain;f=gcc%2Fada%2Fs-mastop.ads;fp=gcc%2Fada%2Fs-mastop.ads;h=0000000000000000000000000000000000000000;hb=6fed43773c9b0ce596dca5686f37ac3fc0fa11c0;hp=6bfc789c0a04cdc3ba5778706bde554b82d88451;hpb=27b11d56b743098deb193d510b337ba22dc52e5c;p=msp430-gcc.git diff --git a/gcc/ada/s-mastop.ads b/gcc/ada/s-mastop.ads deleted file mode 100644 index 6bfc789c..00000000 --- a/gcc/ada/s-mastop.ads +++ /dev/null @@ -1,165 +0,0 @@ ------------------------------------------------------------------------------- --- -- --- GNAT COMPILER COMPONENTS -- --- -- --- SYSTEM.MACHINE_STATE_OPERATIONS -- --- -- --- S p e c -- --- -- --- $Revision: 1.1 $ --- -- --- Copyright (C) 1999-2001 Ada Core Technologies, 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 2, 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, 59 Temple Place - Suite 330, Boston, -- --- MA 02111-1307, USA. -- --- -- --- 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. -- --- -- --- GNAT was originally developed by the GNAT team at New York University. -- --- It is now maintained by Ada Core Technologies Inc (http://www.gnat.com). -- --- -- ------------------------------------------------------------------------------- - -pragma Polling (Off); --- We must turn polling off for this unit, because otherwise we get --- elaboration circularities with System.Exception_Tables. - -with System.Storage_Elements; -with System.Exceptions; - -package System.Machine_State_Operations is - - subtype Code_Loc is System.Address; - -- Code location used in building exception tables and for call - -- addresses when propagating an exception (also traceback table) - -- Values of this type are created by using Label'Address or - -- extracted from machine states using Get_Code_Loc. - - type Machine_State is new System.Address; - -- The table based exception handling approach (see a-except.adb) isolates - -- the target dependent aspects using an abstract data type interface - -- to the type Machine_State, which is represented as a System.Address - -- value (presumably implemented as a pointer to an appropriate record - -- structure). - - function Machine_State_Length return System.Storage_Elements.Storage_Offset; - -- Function to determine the length of the Storage_Array needed to hold - -- a machine state. The machine state will always be maximally aligned. - -- The value returned is a constant that will be used to allocate space - -- for a machine state value. - - function Allocate_Machine_State return Machine_State; - -- Allocate the required space for a Machine_State - - procedure Free_Machine_State (M : in out Machine_State); - -- Free the dynamic memory taken by Machine_State - - -- The initial value of type Machine_State is created by the low level - -- routine that actually raises an exception using the special builtin - -- _builtin_machine_state. This value will typically encode the value - -- of the program counter, and relevant registers. The following - -- operations are defined on Machine_State values: - - function Get_Code_Loc (M : Machine_State) return Code_Loc; - -- This function extracts the program counter value from a machine - -- state, which the caller uses for searching the exception tables, - -- and also for recording entries in the traceback table. The call - -- returns a value of Null_Loc if the machine state represents the - -- outer level, or some other frame for which no information can be - -- provided. - - procedure Pop_Frame - (M : Machine_State; - Info : System.Exceptions.Subprogram_Info_Type); - -- This procedure pops the machine state M so that it represents the - -- call point, as though the current subprogram had returned. It - -- changes only the value referenced by M, and does not affect - -- the current stack environment. - -- - -- The Info parameter represents information generated by the backend - -- (see description of Subprogram_Info node in sinfo.ads). This - -- information is stored as static data during compilation. The - -- caller then passes this information to Pop_Frame, which will - -- use it to determine what must be changed in the machine state - -- (e.g. which save-over-call registers must be restored, and from - -- where on the stack frame they must be restored). - -- - -- A value of No_Info for Info means either that the backend provided - -- no information for current frame, or that the current frame is an - -- other language frame for which no information exists, or that this - -- is an outer level subprogram. In any case, Pop_Frame sets the code - -- location to Null_Address when it pops past such a frame, and this - -- is taken as an indication that the exception is unhandled. - - -- Note: at the current time, Info, if present is always a copy of - -- the entry point of the procedure, as found by searching the - -- subprogram table. For the case where a procedure is indeed in - -- the table (either it is an Ada procedure, or a foreign procedure - -- which is registered using pragma Propagate_Exceptions), then the - -- entry point information will indeed be correct. It may well be - -- possible for Pop_Frame to avoid using the Info parameter (for - -- example if it consults auxiliary Dwarf tables to do its job). - -- This is desirable if it can be done, because it means that it - -- will work fine to propagate exceptions through unregistered - -- foreign procedures. What will happen is that the search in the - -- Ada subprogram table will find a junk entry. Even if this junk - -- entry has an exception table, none of them will apply to the - -- current location, so they will be ignored, and then Pop_Frame - -- will be called to pop the frame. The Info parameter for this - -- call will be junk, but if it is not used that does not matter. - -- Note that the address recorded in the traceback table is of - -- the exception location, so the traceback will be correct even - -- in this case. - - procedure Enter_Handler - (M : Machine_State; - Handler : System.Exceptions.Handler_Loc); - -- When Propagate_Handler locates an applicable exception handler, it - -- calls Enter_Handler, passing it two parameters. The first is the - -- machine state that corresponds to what is required for entry to - -- the handler, as computed by repeated Pop_Frame calls to reach the - -- handler to be entered. The second is the code location for the - -- handler itself which is the address of the label at the start of - -- the handler code. - -- - -- Note: The machine state M is likely stored on the part of the - -- stack that will be popped by the call, so care must be taken - -- not to pop the stack until the Machine_State is entirely read. - -- The value passed as Handler was obtained from elaboration of - -- an N_Handler_Loc node by the backend. - - function Fetch_Code (Loc : Code_Loc) return Code_Loc; - -- Some architectures (notably VMS) use a descriptor to describe - -- a subprogram address. This function computes the actual starting - -- address of the code from Loc. - -- Do not add pragma Inline, see 9116-002. - -- ??? This function will go away when 'Code_Address is fixed on VMS. - - procedure Set_Machine_State (M : Machine_State); - -- This routine sets M from the current machine state. It is called - -- when an exception is initially signalled to initialize the state. - - procedure Set_Signal_Machine_State - (M : Machine_State; - Context : System.Address); - -- This routine sets M from the machine state that corresponds to the - -- point in the code where a signal was raised. The parameter Context - -- is a pointer to a structure created by the operating system when a - -- signal is raised, and made available to the signal handler. The - -- format of this context block, and the manner in which it is made - -- available to the handler, are implementation dependent. - -end System.Machine_State_Operations;