[deliverable/binutils-gdb.git] / gdb / common / common-exceptions.h

/* Exception (throw catch) mechanism, for GDB, the GNU debugger.

   Copyright (C) 1986-2018 Free Software Foundation, Inc.

   This file is part of GDB.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 3 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT 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
   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */

#ifndef COMMON_EXCEPTIONS_H
#define COMMON_EXCEPTIONS_H

#include <setjmp.h>
#include <new>

/* Reasons for calling throw_exceptions().  NOTE: all reason values
   must be different from zero.  enum value 0 is reserved for internal
   use as the return value from an initial setjmp().  */

enum return_reason
  {
    /* User interrupt.  */
    RETURN_QUIT = -2,
    /* Any other error.  */
    RETURN_ERROR
  };

#define RETURN_MASK(reason)	(1 << (int)(-reason))

typedef enum
{
  RETURN_MASK_QUIT = RETURN_MASK (RETURN_QUIT),
  RETURN_MASK_ERROR = RETURN_MASK (RETURN_ERROR),
  RETURN_MASK_ALL = (RETURN_MASK_QUIT | RETURN_MASK_ERROR)
} return_mask;

/* Describe all exceptions.  */

enum errors {
  GDB_NO_ERROR,

  /* Any generic error, the corresponding text is in
     exception.message.  */
  GENERIC_ERROR,

  /* Something requested was not found.  */
  NOT_FOUND_ERROR,

  /* Thread library lacks support necessary for finding thread local
     storage.  */
  TLS_NO_LIBRARY_SUPPORT_ERROR,

  /* Load module not found while attempting to find thread local storage.  */
  TLS_LOAD_MODULE_NOT_FOUND_ERROR,

  /* Thread local storage has not been allocated yet.  */
  TLS_NOT_ALLOCATED_YET_ERROR,

  /* Something else went wrong while attempting to find thread local
     storage.  The ``struct gdb_exception'' message field provides
     more detail.  */
  TLS_GENERIC_ERROR,

  /* Problem parsing an XML document.  */
  XML_PARSE_ERROR,

  /* Error accessing memory.  */
  MEMORY_ERROR,

  /* Value not available.  E.g., a register was not collected in a
     traceframe.  */
  NOT_AVAILABLE_ERROR,

  /* Value was optimized out.  Note: if the value was a register, this
     means the register was not saved in the frame.  */
  OPTIMIZED_OUT_ERROR,

  /* DW_OP_entry_value resolving failed.  */
  NO_ENTRY_VALUE_ERROR,

  /* Target throwing an error has been closed.  Current command should be
     aborted as the inferior state is no longer valid.  */
  TARGET_CLOSE_ERROR,

  /* An undefined command was executed.  */
  UNDEFINED_COMMAND_ERROR,

  /* Requested feature, method, mechanism, etc. is not supported.  */
  NOT_SUPPORTED_ERROR,

  /* The number of candidates generated during line completion has
     reached the user's specified limit.  This isn't an error, this exception
     is used to halt searching for more completions, but for consistency
     "_ERROR" is appended to the name.  */
  MAX_COMPLETIONS_REACHED_ERROR,

  /* Add more errors here.  */
  NR_ERRORS
};

struct gdb_exception
{
  enum return_reason reason;
  enum errors error;
  const char *message;
};

/* The different exception mechanisms that TRY/CATCH can map to.  */

/* Make GDB exceptions use setjmp/longjmp behind the scenes.  */
#define GDB_XCPT_SJMP 1

/* Make GDB exceptions use try/catch behind the scenes.  */
#define GDB_XCPT_TRY 2

/* Specify this mode to build with TRY/CATCH mapped directly to raw
   try/catch.  GDB won't work correctly, but building that way catches
   code tryin to break/continue out of the try block, along with
   spurious code between the TRY and the CATCH block.  */
#define GDB_XCPT_RAW_TRY 3

#define GDB_XCPT GDB_XCPT_TRY

/* Functions to drive the sjlj-based exceptions state machine.  Though
   declared here by necessity, these functions should be considered
   internal to the exceptions subsystem and not used other than via
   the TRY/CATCH (or TRY_SJLJ/CATCH_SJLJ) macros defined below.  */

extern jmp_buf *exceptions_state_mc_init (void);
extern int exceptions_state_mc_action_iter (void);
extern int exceptions_state_mc_action_iter_1 (void);
extern int exceptions_state_mc_catch (struct gdb_exception *, int);

/* Same, but for the C++ try/catch-based TRY/CATCH mechanism.  */

#if GDB_XCPT != GDB_XCPT_SJMP
extern void *exception_try_scope_entry (void);
extern void exception_try_scope_exit (void *saved_state);
extern void exception_rethrow (void) ATTRIBUTE_NORETURN;
#endif

/* Macro to wrap up standard try/catch behavior.

   The double loop lets us correctly handle code "break"ing out of the
   try catch block.  (It works as the "break" only exits the inner
   "while" loop, the outer for loop detects this handling it
   correctly.)  Of course "return" and "goto" are not so lucky.

   For instance:

   *INDENT-OFF*

   TRY
     {
     }
   CATCH (e, RETURN_MASK_ERROR)
     {
       switch (e.reason)
         {
           case RETURN_ERROR: ...
         }
     }
   END_CATCH

  Note that the SJLJ version of the macros are actually named
  TRY_SJLJ/CATCH_SJLJ in order to make it possible to call them even
  when TRY/CATCH are mapped to C++ try/catch.  The SJLJ variants are
  needed in some cases where gdb exceptions need to cross third-party
  library code compiled without exceptions support (e.g.,
  readline).  */

#define TRY_SJLJ \
     { \
       jmp_buf *buf = \
	 exceptions_state_mc_init (); \
       setjmp (*buf); \
     } \
     while (exceptions_state_mc_action_iter ()) \
       while (exceptions_state_mc_action_iter_1 ())

#define CATCH_SJLJ(EXCEPTION, MASK)				\
  {							\
    struct gdb_exception EXCEPTION;				\
    if (exceptions_state_mc_catch (&(EXCEPTION), MASK))

#define END_CATCH_SJLJ				\
  }

#if GDB_XCPT == GDB_XCPT_SJMP

/* If using SJLJ-based exceptions for all exceptions, then provide
   standard aliases.  */

#define TRY TRY_SJLJ
#define CATCH CATCH_SJLJ
#define END_CATCH END_CATCH_SJLJ

#endif /* GDB_XCPT_SJMP */

#if GDB_XCPT == GDB_XCPT_TRY || GDB_XCPT == GDB_XCPT_RAW_TRY

/* Prevent error/quit during TRY from calling cleanups established
   prior to here.  This pops out the scope in either case of normal
   exit or exception exit.  */
struct exception_try_scope
{
  exception_try_scope ()
  {
    saved_state = exception_try_scope_entry ();
  }
  ~exception_try_scope ()
  {
    exception_try_scope_exit (saved_state);
  }

  void *saved_state;
};

#if GDB_XCPT == GDB_XCPT_TRY

/* We still need to wrap TRY/CATCH in C++ so that cleanups and C++
   exceptions can coexist.

   The TRY blocked is wrapped in a do/while(0) so that break/continue
   within the block works the same as in C.

   END_CATCH makes sure that even if the CATCH block doesn't want to
   catch the exception, we stop at every frame in the unwind chain to
   run its cleanups, which may e.g., have pointers to stack variables
   that are going to be destroyed.

   There's an outer scope around the whole TRY/END_CATCH in order to
   cause a compilation error if you forget to add the END_CATCH at the
   end a TRY/CATCH construct.  */

#define TRY								\
  {									\
    try									\
      {									\
	exception_try_scope exception_try_scope_instance;		\
	do								\
	  {

#define CATCH(EXCEPTION, MASK)						\
	  } while (0);							\
	}								\
    catch (struct gdb_exception ## _ ## MASK &EXCEPTION)

#define END_CATCH				\
    catch (...)					\
      {						\
	exception_rethrow ();			\
      }						\
  }

#else

#define TRY try
#define CATCH(EXCEPTION, MASK) \
  catch (struct gdb_exception ## _ ## MASK &EXCEPTION)
#define END_CATCH

#endif

/* The exception types client code may catch.  They're just shims
   around gdb_exception that add nothing but type info.  Which is used
   is selected depending on the MASK argument passed to CATCH.  */

struct gdb_exception_RETURN_MASK_ALL : public gdb_exception
{
};

struct gdb_exception_RETURN_MASK_ERROR : public gdb_exception_RETURN_MASK_ALL
{
};

struct gdb_exception_RETURN_MASK_QUIT : public gdb_exception_RETURN_MASK_ALL
{
};

#endif /* GDB_XCPT_TRY || GDB_XCPT_RAW_TRY */

/* An exception type that inherits from both std::bad_alloc and a gdb
   exception.  This is necessary because operator new can only throw
   std::bad_alloc, and OTOH, we want exceptions thrown due to memory
   allocation error to be caught by all the CATCH/RETURN_MASK_ALL
   spread around the codebase.  */

struct gdb_quit_bad_alloc
  : public gdb_exception_RETURN_MASK_QUIT,
    public std::bad_alloc
{
  explicit gdb_quit_bad_alloc (gdb_exception ex)
    : std::bad_alloc ()
  {
    gdb_exception *self = this;

    *self = ex;
  }
};

/* *INDENT-ON* */

/* Throw an exception (as described by "struct gdb_exception"),
   landing in the inner most containing exception handler established
   using TRY/CATCH.  */
extern void throw_exception (struct gdb_exception exception)
     ATTRIBUTE_NORETURN;

/* Throw an exception by executing a LONG JUMP to the inner most
   containing exception handler established using TRY_SJLJ.  Necessary
   in some cases where we need to throw GDB exceptions across
   third-party library code (e.g., readline).  */
extern void throw_exception_sjlj (struct gdb_exception exception)
     ATTRIBUTE_NORETURN;

/* Convenience wrappers around throw_exception that throw GDB
   errors.  */
extern void throw_verror (enum errors, const char *fmt, va_list ap)
     ATTRIBUTE_NORETURN ATTRIBUTE_PRINTF (2, 0);
extern void throw_vquit (const char *fmt, va_list ap)
     ATTRIBUTE_NORETURN ATTRIBUTE_PRINTF (1, 0);
extern void throw_error (enum errors error, const char *fmt, ...)
     ATTRIBUTE_NORETURN ATTRIBUTE_PRINTF (2, 3);
extern void throw_quit (const char *fmt, ...)
     ATTRIBUTE_NORETURN ATTRIBUTE_PRINTF (1, 2);

/* A pre-defined non-exception.  */
extern const struct gdb_exception exception_none;

#endif /* COMMON_EXCEPTIONS_H */
Commit	Line	Data
ff55e1b5 GB	1	/* Exception (throw catch) mechanism, for GDB, the GNU debugger.
ff55e1b5 GB	2
e2882c85	3	Copyright (C) 1986-2018 Free Software Foundation, Inc.
ff55e1b5 GB	4
	5	This file is part of GDB.
	6
	7	This program is free software; you can redistribute it and/or modify
	8	it under the terms of the GNU General Public License as published by
	9	the Free Software Foundation; either version 3 of the License, or
	10	(at your option) any later version.
	11
	12	This program is distributed in the hope that it will be useful,
	13	but WITHOUT ANY WARRANTY; without even the implied warranty of
	14	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	15	GNU General Public License for more details.
	16
	17	You should have received a copy of the GNU General Public License
	18	along with this program. If not, see <http://www.gnu.org/licenses/>. */
	19
	20	#ifndef COMMON_EXCEPTIONS_H
	21	#define COMMON_EXCEPTIONS_H
	22
173981bc	23	#include <setjmp.h>
503b1c39	24	#include <new>
ff55e1b5 GB	25
ff55e1b5 GB	26	/* Reasons for calling throw_exceptions(). NOTE: all reason values
65630365 PA	27	must be different from zero. enum value 0 is reserved for internal
65630365 PA	28	use as the return value from an initial setjmp(). */
ff55e1b5 GB	29
	30	enum return_reason
	31	{
	32	/* User interrupt. */
	33	RETURN_QUIT = -2,
	34	/* Any other error. */
	35	RETURN_ERROR
	36	};
	37
	38	#define RETURN_MASK(reason) (1 << (int)(-reason))
	39
	40	typedef enum
	41	{
	42	RETURN_MASK_QUIT = RETURN_MASK (RETURN_QUIT),
	43	RETURN_MASK_ERROR = RETURN_MASK (RETURN_ERROR),
	44	RETURN_MASK_ALL = (RETURN_MASK_QUIT \| RETURN_MASK_ERROR)
	45	} return_mask;
	46
	47	/* Describe all exceptions. */
	48
	49	enum errors {
	50	GDB_NO_ERROR,
	51
	52	/* Any generic error, the corresponding text is in
	53	exception.message. */
	54	GENERIC_ERROR,
	55
	56	/* Something requested was not found. */
	57	NOT_FOUND_ERROR,
	58
	59	/* Thread library lacks support necessary for finding thread local
	60	storage. */
	61	TLS_NO_LIBRARY_SUPPORT_ERROR,
	62
	63	/* Load module not found while attempting to find thread local storage. */
	64	TLS_LOAD_MODULE_NOT_FOUND_ERROR,
	65
	66	/* Thread local storage has not been allocated yet. */
	67	TLS_NOT_ALLOCATED_YET_ERROR,
	68
	69	/* Something else went wrong while attempting to find thread local
	70	storage. The ``struct gdb_exception'' message field provides
	71	more detail. */
	72	TLS_GENERIC_ERROR,
	73
	74	/* Problem parsing an XML document. */
	75	XML_PARSE_ERROR,
	76
	77	/* Error accessing memory. */
	78	MEMORY_ERROR,
	79
	80	/* Value not available. E.g., a register was not collected in a
	81	traceframe. */
	82	NOT_AVAILABLE_ERROR,
	83
	84	/* Value was optimized out. Note: if the value was a register, this
	85	means the register was not saved in the frame. */
	86	OPTIMIZED_OUT_ERROR,
	87
216f72a1	88	/* DW_OP_entry_value resolving failed. */
ff55e1b5 GB	89	NO_ENTRY_VALUE_ERROR,
	90
	91	/* Target throwing an error has been closed. Current command should be
	92	aborted as the inferior state is no longer valid. */
	93	TARGET_CLOSE_ERROR,
	94
	95	/* An undefined command was executed. */
	96	UNDEFINED_COMMAND_ERROR,
	97
	98	/* Requested feature, method, mechanism, etc. is not supported. */
	99	NOT_SUPPORTED_ERROR,
	100
ef0b411a GB	101	/* The number of candidates generated during line completion has
	102	reached the user's specified limit. This isn't an error, this exception
	103	is used to halt searching for more completions, but for consistency
	104	"_ERROR" is appended to the name. */
	105	MAX_COMPLETIONS_REACHED_ERROR,
	106
ff55e1b5 GB	107	/* Add more errors here. */
	108	NR_ERRORS
	109	};
	110
	111	struct gdb_exception
	112	{
	113	enum return_reason reason;
	114	enum errors error;
	115	const char *message;
	116	};
	117
eec461d0 PA	118	/* The different exception mechanisms that TRY/CATCH can map to. */
eec461d0 PA	119
ddb6d633	120	/* Make GDB exceptions use setjmp/longjmp behind the scenes. */
eec461d0 PA	121	#define GDB_XCPT_SJMP 1
eec461d0 PA	122
6290672f	123	/* Make GDB exceptions use try/catch behind the scenes. */
eec461d0 PA	124	#define GDB_XCPT_TRY 2
	125
	126	/* Specify this mode to build with TRY/CATCH mapped directly to raw
	127	try/catch. GDB won't work correctly, but building that way catches
	128	code tryin to break/continue out of the try block, along with
	129	spurious code between the TRY and the CATCH block. */
	130	#define GDB_XCPT_RAW_TRY 3
	131
ddb6d633	132	#define GDB_XCPT GDB_XCPT_TRY
eec461d0	133
89525768 PA	134	/* Functions to drive the sjlj-based exceptions state machine. Though
	135	declared here by necessity, these functions should be considered
	136	internal to the exceptions subsystem and not used other than via
	137	the TRY/CATCH (or TRY_SJLJ/CATCH_SJLJ) macros defined below. */
ff55e1b5	138
173981bc	139	extern jmp_buf *exceptions_state_mc_init (void);
ff55e1b5 GB	140	extern int exceptions_state_mc_action_iter (void);
ff55e1b5 GB	141	extern int exceptions_state_mc_action_iter_1 (void);
492d29ea	142	extern int exceptions_state_mc_catch (struct gdb_exception *, int);
89525768 PA	143
	144	/* Same, but for the C++ try/catch-based TRY/CATCH mechanism. */
	145
	146	#if GDB_XCPT != GDB_XCPT_SJMP
72df25b2 PA	147	extern void *exception_try_scope_entry (void);
72df25b2 PA	148	extern void exception_try_scope_exit (void *saved_state);
f7c6f423	149	extern void exception_rethrow (void) ATTRIBUTE_NORETURN;
72df25b2	150	#endif
ff55e1b5 GB	151
	152	/* Macro to wrap up standard try/catch behavior.
	153
	154	The double loop lets us correctly handle code "break"ing out of the
	155	try catch block. (It works as the "break" only exits the inner
	156	"while" loop, the outer for loop detects this handling it
	157	correctly.) Of course "return" and "goto" are not so lucky.
	158
	159	For instance:
	160
	161	INDENT-OFF
	162
492d29ea	163	TRY
ff55e1b5 GB	164	{
ff55e1b5 GB	165	}
492d29ea	166	CATCH (e, RETURN_MASK_ERROR)
ff55e1b5	167	{
492d29ea PA	168	switch (e.reason)
	169	{
	170	case RETURN_ERROR: ...
	171	}
ff55e1b5	172	}
492d29ea	173	END_CATCH
ff55e1b5	174
89525768 PA	175	Note that the SJLJ version of the macros are actually named
	176	TRY_SJLJ/CATCH_SJLJ in order to make it possible to call them even
	177	when TRY/CATCH are mapped to C++ try/catch. The SJLJ variants are
	178	needed in some cases where gdb exceptions need to cross third-party
	179	library code compiled without exceptions support (e.g.,
	180	readline). */
ff55e1b5	181
89525768	182	#define TRY_SJLJ \
ff55e1b5	183	{ \
173981bc	184	jmp_buf *buf = \
492d29ea	185	exceptions_state_mc_init (); \
173981bc	186	setjmp (*buf); \
ff55e1b5 GB	187	} \
	188	while (exceptions_state_mc_action_iter ()) \
	189	while (exceptions_state_mc_action_iter_1 ())
	190
89525768	191	#define CATCH_SJLJ(EXCEPTION, MASK) \
492d29ea PA	192	{ \
	193	struct gdb_exception EXCEPTION; \
	194	if (exceptions_state_mc_catch (&(EXCEPTION), MASK))
	195
89525768	196	#define END_CATCH_SJLJ \
492d29ea PA	197	}
492d29ea PA	198
89525768 PA	199	#if GDB_XCPT == GDB_XCPT_SJMP
	200
	201	/* If using SJLJ-based exceptions for all exceptions, then provide
	202	standard aliases. */
	203
	204	#define TRY TRY_SJLJ
	205	#define CATCH CATCH_SJLJ
	206	#define END_CATCH END_CATCH_SJLJ
	207
eec461d0 PA	208	#endif /* GDB_XCPT_SJMP */
	209
	210	#if GDB_XCPT == GDB_XCPT_TRY \|\| GDB_XCPT == GDB_XCPT_RAW_TRY
72df25b2 PA	211
	212	/* Prevent error/quit during TRY from calling cleanups established
	213	prior to here. This pops out the scope in either case of normal
	214	exit or exception exit. */
	215	struct exception_try_scope
	216	{
	217	exception_try_scope ()
	218	{
	219	saved_state = exception_try_scope_entry ();
	220	}
	221	~exception_try_scope ()
	222	{
	223	exception_try_scope_exit (saved_state);
	224	}
	225
	226	void *saved_state;
	227	};
	228
eec461d0	229	#if GDB_XCPT == GDB_XCPT_TRY
9c6595ab	230
72df25b2	231	/* We still need to wrap TRY/CATCH in C++ so that cleanups and C++
a87c1427 PA	232	exceptions can coexist.
	233
	234	The TRY blocked is wrapped in a do/while(0) so that break/continue
	235	within the block works the same as in C.
	236
	237	END_CATCH makes sure that even if the CATCH block doesn't want to
	238	catch the exception, we stop at every frame in the unwind chain to
	239	run its cleanups, which may e.g., have pointers to stack variables
	240	that are going to be destroyed.
	241
	242	There's an outer scope around the whole TRY/END_CATCH in order to
	243	cause a compilation error if you forget to add the END_CATCH at the
	244	end a TRY/CATCH construct. */
	245
72df25b2	246	#define TRY \
a87c1427 PA	247	{ \
	248	try \
	249	{ \
	250	exception_try_scope exception_try_scope_instance; \
	251	do \
	252	{
72df25b2 PA	253
72df25b2 PA	254	#define CATCH(EXCEPTION, MASK) \
a87c1427 PA	255	} while (0); \
	256	} \
	257	catch (struct gdb_exception ## _ ## MASK &EXCEPTION)
72df25b2 PA	258
72df25b2 PA	259	#define END_CATCH \
a87c1427 PA	260	catch (...) \
	261	{ \
	262	exception_rethrow (); \
	263	} \
72df25b2	264	}
eec461d0	265
9c6595ab PA	266	#else
	267
	268	#define TRY try
	269	#define CATCH(EXCEPTION, MASK) \
	270	catch (struct gdb_exception ## _ ## MASK &EXCEPTION)
	271	#define END_CATCH
	272
	273	#endif
72df25b2 PA	274
	275	/* The exception types client code may catch. They're just shims
	276	around gdb_exception that add nothing but type info. Which is used
	277	is selected depending on the MASK argument passed to CATCH. */
	278
	279	struct gdb_exception_RETURN_MASK_ALL : public gdb_exception
	280	{
	281	};
	282
	283	struct gdb_exception_RETURN_MASK_ERROR : public gdb_exception_RETURN_MASK_ALL
	284	{
	285	};
	286
	287	struct gdb_exception_RETURN_MASK_QUIT : public gdb_exception_RETURN_MASK_ALL
	288	{
	289	};
	290
eec461d0	291	#endif /* GDB_XCPT_TRY \|\| GDB_XCPT_RAW_TRY */
72df25b2	292
503b1c39 PA	293	/* An exception type that inherits from both std::bad_alloc and a gdb
	294	exception. This is necessary because operator new can only throw
	295	std::bad_alloc, and OTOH, we want exceptions thrown due to memory
	296	allocation error to be caught by all the CATCH/RETURN_MASK_ALL
	297	spread around the codebase. */
	298
	299	struct gdb_quit_bad_alloc
	300	: public gdb_exception_RETURN_MASK_QUIT,
	301	public std::bad_alloc
	302	{
	303	explicit gdb_quit_bad_alloc (gdb_exception ex)
	304	: std::bad_alloc ()
	305	{
	306	gdb_exception *self = this;
	307
	308	*self = ex;
	309	}
	310	};
	311
ff55e1b5 GB	312	/* INDENT-ON */
ff55e1b5 GB	313
ddb6d633 PA	314	/* Throw an exception (as described by "struct gdb_exception"),
	315	landing in the inner most containing exception handler established
	316	using TRY/CATCH. */
ff55e1b5 GB	317	extern void throw_exception (struct gdb_exception exception)
ff55e1b5 GB	318	ATTRIBUTE_NORETURN;
89525768 PA	319
89525768 PA	320	/* Throw an exception by executing a LONG JUMP to the inner most
ddb6d633 PA	321	containing exception handler established using TRY_SJLJ. Necessary
	322	in some cases where we need to throw GDB exceptions across
	323	third-party library code (e.g., readline). */
89525768 PA	324	extern void throw_exception_sjlj (struct gdb_exception exception)
	325	ATTRIBUTE_NORETURN;
	326
	327	/* Convenience wrappers around throw_exception that throw GDB
	328	errors. */
ff55e1b5 GB	329	extern void throw_verror (enum errors, const char *fmt, va_list ap)
	330	ATTRIBUTE_NORETURN ATTRIBUTE_PRINTF (2, 0);
	331	extern void throw_vquit (const char *fmt, va_list ap)
	332	ATTRIBUTE_NORETURN ATTRIBUTE_PRINTF (1, 0);
	333	extern void throw_error (enum errors error, const char *fmt, ...)
	334	ATTRIBUTE_NORETURN ATTRIBUTE_PRINTF (2, 3);
	335	extern void throw_quit (const char *fmt, ...)
	336	ATTRIBUTE_NORETURN ATTRIBUTE_PRINTF (1, 2);
	337
ad6aff7d PA	338	/* A pre-defined non-exception. */
	339	extern const struct gdb_exception exception_none;
	340
ff55e1b5	341	#endif /* COMMON_EXCEPTIONS_H */