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verified gcc-4.6.4.tar.bz2.sig;
imported gcc-4.6.4 source tree from verified upstream tarball.

downloading a git-generated archive based on the 'upstream' tag
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if you have obtained the source via the command 'git clone',
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1 files changed, 107 insertions, 0 deletions

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+------------------------------------------------------------------------------
+--                                                                          --
+--                         GNAT COMPILER COMPONENTS                         --
+--                                                                          --
+--                      SYSTEM.MACHINE_STATE_OPERATIONS                     --
+--                                                                          --
+--                                 S p e c                                  --
+--                                                                          --
+--          Copyright (C) 1999-2009, 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.      --
+--                                                                          --
+------------------------------------------------------------------------------
+
+pragma Compiler_Unit;
+
+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;
+
+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);
+   --  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.
+
+   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.
+   --
+   --  ??? This function will go away when 'Code_Address is fixed on VMS.
+   --
+   --  Do not add pragma Inline to this function: there is a curious
+   --  interaction between rtsfind and front-end inlining. The exception
+   --  declaration in s-auxdec calls rtsfind, which forces several other system
+   --  packages to be compiled. Some of those have a pragma Inline, and we
+   --  compile the corresponding bodies so that inlining can take place. One
+   --  of these packages is s-mastop, which depends on s-auxdec, which is still
+   --  being compiled: we have not seen all the declarations in it yet, so we
+   --  get confused semantic errors.
+
+   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.
+
+end System.Machine_State_Operations;