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[/] [openrisc/] [trunk/] [gnu-stable/] [gcc-4.5.1/] [gcc/] [unwind-generic.h] - Blame information for rev 859

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1 280 jeremybenn
/* Exception handling and frame unwind runtime interface routines.
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   Copyright (C) 2001, 2003, 2004, 2006, 2008, 2009 Free Software Foundation, Inc.
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   This file is part of GCC.
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   GCC is free software; you can redistribute it and/or modify it
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   under the terms of the GNU General Public License as published by
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   the Free Software Foundation; either version 3, or (at your option)
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   any later version.
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   GCC is distributed in the hope that it will be useful, but WITHOUT
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   ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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   or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
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   License for more details.
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   Under Section 7 of GPL version 3, you are granted additional
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   permissions described in the GCC Runtime Library Exception, version
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   3.1, as published by the Free Software Foundation.
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   You should have received a copy of the GNU General Public License and
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   a copy of the GCC Runtime Library Exception along with this program;
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   see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
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   <http://www.gnu.org/licenses/>.  */
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/* This is derived from the C++ ABI for IA-64.  Where we diverge
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   for cross-architecture compatibility are noted with "@@@".  */
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#ifndef _UNWIND_H
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#define _UNWIND_H
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#ifndef HIDE_EXPORTS
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#pragma GCC visibility push(default)
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#endif
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#ifdef __cplusplus
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extern "C" {
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#endif
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/* Level 1: Base ABI  */
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/* @@@ The IA-64 ABI uses uint64 throughout.  Most places this is
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   inefficient for 32-bit and smaller machines.  */
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typedef unsigned _Unwind_Word __attribute__((__mode__(__unwind_word__)));
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typedef signed _Unwind_Sword __attribute__((__mode__(__unwind_word__)));
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#if defined(__ia64__) && defined(__hpux__)
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typedef unsigned _Unwind_Ptr __attribute__((__mode__(__word__)));
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#else
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typedef unsigned _Unwind_Ptr __attribute__((__mode__(__pointer__)));
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#endif
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typedef unsigned _Unwind_Internal_Ptr __attribute__((__mode__(__pointer__)));
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/* @@@ The IA-64 ABI uses a 64-bit word to identify the producer and
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   consumer of an exception.  We'll go along with this for now even on
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   32-bit machines.  We'll need to provide some other option for
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   16-bit machines and for machines with > 8 bits per byte.  */
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typedef unsigned _Unwind_Exception_Class __attribute__((__mode__(__DI__)));
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/* The unwind interface uses reason codes in several contexts to
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   identify the reasons for failures or other actions.  */
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typedef enum
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{
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  _URC_NO_REASON = 0,
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  _URC_FOREIGN_EXCEPTION_CAUGHT = 1,
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  _URC_FATAL_PHASE2_ERROR = 2,
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  _URC_FATAL_PHASE1_ERROR = 3,
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  _URC_NORMAL_STOP = 4,
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  _URC_END_OF_STACK = 5,
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  _URC_HANDLER_FOUND = 6,
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  _URC_INSTALL_CONTEXT = 7,
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  _URC_CONTINUE_UNWIND = 8
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} _Unwind_Reason_Code;
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/* The unwind interface uses a pointer to an exception header object
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   as its representation of an exception being thrown. In general, the
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   full representation of an exception object is language- and
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   implementation-specific, but it will be prefixed by a header
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   understood by the unwind interface.  */
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struct _Unwind_Exception;
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typedef void (*_Unwind_Exception_Cleanup_Fn) (_Unwind_Reason_Code,
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                                              struct _Unwind_Exception *);
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struct _Unwind_Exception
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{
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  _Unwind_Exception_Class exception_class;
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  _Unwind_Exception_Cleanup_Fn exception_cleanup;
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  _Unwind_Word private_1;
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  _Unwind_Word private_2;
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  /* @@@ The IA-64 ABI says that this structure must be double-word aligned.
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     Taking that literally does not make much sense generically.  Instead we
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     provide the maximum alignment required by any type for the machine.  */
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} __attribute__((__aligned__));
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/* The ACTIONS argument to the personality routine is a bitwise OR of one
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   or more of the following constants.  */
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typedef int _Unwind_Action;
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#define _UA_SEARCH_PHASE        1
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#define _UA_CLEANUP_PHASE       2
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#define _UA_HANDLER_FRAME       4
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#define _UA_FORCE_UNWIND        8
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#define _UA_END_OF_STACK        16
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/* The target can override this macro to define any back-end-specific
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   attributes required for the lowest-level stack frame.  */
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#ifndef LIBGCC2_UNWIND_ATTRIBUTE
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#define LIBGCC2_UNWIND_ATTRIBUTE
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#endif
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/* This is an opaque type used to refer to a system-specific data
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   structure used by the system unwinder. This context is created and
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   destroyed by the system, and passed to the personality routine
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   during unwinding.  */
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struct _Unwind_Context;
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/* Raise an exception, passing along the given exception object.  */
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extern _Unwind_Reason_Code LIBGCC2_UNWIND_ATTRIBUTE
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_Unwind_RaiseException (struct _Unwind_Exception *);
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/* Raise an exception for forced unwinding.  */
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typedef _Unwind_Reason_Code (*_Unwind_Stop_Fn)
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     (int, _Unwind_Action, _Unwind_Exception_Class,
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      struct _Unwind_Exception *, struct _Unwind_Context *, void *);
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extern _Unwind_Reason_Code LIBGCC2_UNWIND_ATTRIBUTE
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_Unwind_ForcedUnwind (struct _Unwind_Exception *, _Unwind_Stop_Fn, void *);
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/* Helper to invoke the exception_cleanup routine.  */
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extern void _Unwind_DeleteException (struct _Unwind_Exception *);
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/* Resume propagation of an existing exception.  This is used after
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   e.g. executing cleanup code, and not to implement rethrowing.  */
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extern void LIBGCC2_UNWIND_ATTRIBUTE
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_Unwind_Resume (struct _Unwind_Exception *);
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/* @@@ Resume propagation of a FORCE_UNWIND exception, or to rethrow
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   a normal exception that was handled.  */
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extern _Unwind_Reason_Code LIBGCC2_UNWIND_ATTRIBUTE
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_Unwind_Resume_or_Rethrow (struct _Unwind_Exception *);
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/* @@@ Use unwind data to perform a stack backtrace.  The trace callback
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   is called for every stack frame in the call chain, but no cleanup
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   actions are performed.  */
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typedef _Unwind_Reason_Code (*_Unwind_Trace_Fn)
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     (struct _Unwind_Context *, void *);
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extern _Unwind_Reason_Code LIBGCC2_UNWIND_ATTRIBUTE
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_Unwind_Backtrace (_Unwind_Trace_Fn, void *);
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/* These functions are used for communicating information about the unwind
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   context (i.e. the unwind descriptors and the user register state) between
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   the unwind library and the personality routine and landing pad.  Only
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   selected registers may be manipulated.  */
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extern _Unwind_Word _Unwind_GetGR (struct _Unwind_Context *, int);
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extern void _Unwind_SetGR (struct _Unwind_Context *, int, _Unwind_Word);
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extern _Unwind_Ptr _Unwind_GetIP (struct _Unwind_Context *);
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extern _Unwind_Ptr _Unwind_GetIPInfo (struct _Unwind_Context *, int *);
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extern void _Unwind_SetIP (struct _Unwind_Context *, _Unwind_Ptr);
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/* @@@ Retrieve the CFA of the given context.  */
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extern _Unwind_Word _Unwind_GetCFA (struct _Unwind_Context *);
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extern void *_Unwind_GetLanguageSpecificData (struct _Unwind_Context *);
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extern _Unwind_Ptr _Unwind_GetRegionStart (struct _Unwind_Context *);
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/* The personality routine is the function in the C++ (or other language)
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   runtime library which serves as an interface between the system unwind
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   library and language-specific exception handling semantics.  It is
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   specific to the code fragment described by an unwind info block, and
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   it is always referenced via the pointer in the unwind info block, and
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   hence it has no ABI-specified name.
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   Note that this implies that two different C++ implementations can
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   use different names, and have different contents in the language
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   specific data area.  Moreover, that the language specific data
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   area contains no version info because name of the function invoked
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   provides more effective versioning by detecting at link time the
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   lack of code to handle the different data format.  */
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typedef _Unwind_Reason_Code (*_Unwind_Personality_Fn)
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     (int, _Unwind_Action, _Unwind_Exception_Class,
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      struct _Unwind_Exception *, struct _Unwind_Context *);
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/* @@@ The following alternate entry points are for setjmp/longjmp
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   based unwinding.  */
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struct SjLj_Function_Context;
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extern void _Unwind_SjLj_Register (struct SjLj_Function_Context *);
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extern void _Unwind_SjLj_Unregister (struct SjLj_Function_Context *);
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extern _Unwind_Reason_Code LIBGCC2_UNWIND_ATTRIBUTE
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_Unwind_SjLj_RaiseException (struct _Unwind_Exception *);
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extern _Unwind_Reason_Code LIBGCC2_UNWIND_ATTRIBUTE
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_Unwind_SjLj_ForcedUnwind (struct _Unwind_Exception *, _Unwind_Stop_Fn, void *);
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extern void LIBGCC2_UNWIND_ATTRIBUTE
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_Unwind_SjLj_Resume (struct _Unwind_Exception *);
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extern _Unwind_Reason_Code LIBGCC2_UNWIND_ATTRIBUTE
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_Unwind_SjLj_Resume_or_Rethrow (struct _Unwind_Exception *);
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/* @@@ The following provide access to the base addresses for text
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   and data-relative addressing in the LDSA.  In order to stay link
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   compatible with the standard ABI for IA-64, we inline these.  */
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#ifdef __ia64__
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#include <stdlib.h>
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static inline _Unwind_Ptr
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_Unwind_GetDataRelBase (struct _Unwind_Context *_C)
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{
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  /* The GP is stored in R1.  */
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  return _Unwind_GetGR (_C, 1);
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}
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static inline _Unwind_Ptr
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_Unwind_GetTextRelBase (struct _Unwind_Context *_C __attribute__ ((__unused__)))
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{
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  abort ();
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  return 0;
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}
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/* @@@ Retrieve the Backing Store Pointer of the given context.  */
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extern _Unwind_Word _Unwind_GetBSP (struct _Unwind_Context *);
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#else
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extern _Unwind_Ptr _Unwind_GetDataRelBase (struct _Unwind_Context *);
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extern _Unwind_Ptr _Unwind_GetTextRelBase (struct _Unwind_Context *);
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#endif
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/* @@@ Given an address, return the entry point of the function that
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   contains it.  */
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extern void * _Unwind_FindEnclosingFunction (void *pc);
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#ifndef __SIZEOF_LONG__
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  #error "__SIZEOF_LONG__ macro not defined"
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#endif
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#ifndef __SIZEOF_POINTER__
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  #error "__SIZEOF_POINTER__ macro not defined"
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#endif
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/* leb128 type numbers have a potentially unlimited size.
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   The target of the following definitions of _sleb128_t and _uleb128_t
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   is to have efficient data types large enough to hold the leb128 type
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   numbers used in the unwind code.
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   Mostly these types will simply be defined to long and unsigned long
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   except when a unsigned long data type on the target machine is not
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   capable of storing a pointer.  */
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#if __SIZEOF_LONG__ >= __SIZEOF_POINTER__
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  typedef long _sleb128_t;
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  typedef unsigned long _uleb128_t;
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#elif __SIZEOF_LONG_LONG__ >= __SIZEOF_POINTER__
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  typedef long long _sleb128_t;
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  typedef unsigned long long _uleb128_t;
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#else
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# error "What type shall we use for _sleb128_t?"
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#endif
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#ifdef __cplusplus
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}
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#endif
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#ifndef HIDE_EXPORTS
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#pragma GCC visibility pop
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#endif
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#endif /* unwind.h */

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