mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-26 11:47:31 +00:00
184 lines
6.8 KiB
C++
184 lines
6.8 KiB
C++
/* Exception Handling interface routines.
|
|
Copyright (C) 1996, 1997, 1998, 1999, 2000, 2001, 2002
|
|
Free Software Foundation, Inc.
|
|
Contributed by Mike Stump <mrs@cygnus.com>.
|
|
|
|
This file is part of GCC.
|
|
|
|
GCC 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 2, or (at your option) any later
|
|
version.
|
|
|
|
GCC 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 GCC; see the file COPYING. If not, write to the Free
|
|
Software Foundation, 59 Temple Place - Suite 330, Boston, MA
|
|
02111-1307, USA. */
|
|
|
|
|
|
#ifndef GCC_VARRAY_H
|
|
struct varray_head_tag;
|
|
#define varray_type struct varray_head_tag *
|
|
#endif
|
|
|
|
struct function;
|
|
|
|
struct inline_remap;
|
|
|
|
/* Per-function EH data. Used only in except.c, but GC and others
|
|
manipulate pointers to the opaque type. */
|
|
struct eh_status;
|
|
|
|
/* Internal structure describing a region. */
|
|
struct eh_region;
|
|
|
|
/* Test: is exception handling turned on? */
|
|
extern int doing_eh PARAMS ((int));
|
|
|
|
/* Start an exception handling region. All instructions emitted after
|
|
this point are considered to be part of the region until an
|
|
expand_eh_region_end variant is invoked. */
|
|
extern void expand_eh_region_start PARAMS ((void));
|
|
|
|
/* End an exception handling region for a cleanup. HANDLER is an
|
|
expression to expand for the cleanup. */
|
|
extern void expand_eh_region_end_cleanup PARAMS ((tree));
|
|
|
|
/* End an exception handling region for a try block, and prepares
|
|
for subsequent calls to expand_start_catch. */
|
|
extern void expand_start_all_catch PARAMS ((void));
|
|
|
|
/* Begin a catch clause. TYPE is an object to be matched by the
|
|
runtime, or a list of such objects, or null if this is a catch-all
|
|
clause. */
|
|
extern void expand_start_catch PARAMS ((tree));
|
|
|
|
/* End a catch clause. Control will resume after the try/catch block. */
|
|
extern void expand_end_catch PARAMS ((void));
|
|
|
|
/* End a sequence of catch handlers for a try block. */
|
|
extern void expand_end_all_catch PARAMS ((void));
|
|
|
|
/* End an exception region for an exception type filter. ALLOWED is a
|
|
TREE_LIST of TREE_VALUE objects to be matched by the runtime.
|
|
FAILURE is a function to invoke if a mismatch occurs. */
|
|
extern void expand_eh_region_end_allowed PARAMS ((tree, tree));
|
|
|
|
/* End an exception region for a must-not-throw filter. FAILURE is a
|
|
function to invoke if an uncaught exception propagates this far. */
|
|
extern void expand_eh_region_end_must_not_throw PARAMS ((tree));
|
|
|
|
/* End an exception region for a throw. No handling goes on here,
|
|
but it's the easiest way for the front-end to indicate what type
|
|
is being thrown. */
|
|
extern void expand_eh_region_end_throw PARAMS ((tree));
|
|
|
|
/* End a fixup region. Within this region the cleanups for the immediately
|
|
enclosing region are _not_ run. This is used for goto cleanup to avoid
|
|
destroying an object twice. */
|
|
extern void expand_eh_region_end_fixup PARAMS ((tree));
|
|
|
|
/* Note that the current EH region (if any) may contain a throw, or a
|
|
call to a function which itself may contain a throw. */
|
|
extern void note_eh_region_may_contain_throw PARAMS ((void));
|
|
|
|
/* Invokes CALLBACK for every exception handler label. Only used by old
|
|
loop hackery; should not be used by new code. */
|
|
extern void for_each_eh_label PARAMS ((void (*) (rtx)));
|
|
|
|
/* Determine if the given INSN can throw an exception. */
|
|
extern bool can_throw_internal PARAMS ((rtx));
|
|
extern bool can_throw_external PARAMS ((rtx));
|
|
|
|
/* Set current_function_nothrow and cfun->all_throwers_are_sibcalls. */
|
|
extern void set_nothrow_function_flags PARAMS ((void));
|
|
|
|
/* After initial rtl generation, call back to finish generating
|
|
exception support code. */
|
|
extern void finish_eh_generation PARAMS ((void));
|
|
|
|
extern void init_eh PARAMS ((void));
|
|
extern void init_eh_for_function PARAMS ((void));
|
|
|
|
extern rtx reachable_handlers PARAMS ((rtx));
|
|
extern void maybe_remove_eh_handler PARAMS ((rtx));
|
|
|
|
extern void convert_from_eh_region_ranges PARAMS ((void));
|
|
extern void convert_to_eh_region_ranges PARAMS ((void));
|
|
extern void find_exception_handler_labels PARAMS ((void));
|
|
extern bool current_function_has_exception_handlers PARAMS ((void));
|
|
extern void output_function_exception_table PARAMS ((void));
|
|
|
|
extern void expand_builtin_unwind_init PARAMS ((void));
|
|
extern rtx expand_builtin_eh_return_data_regno PARAMS ((tree));
|
|
extern rtx expand_builtin_extract_return_addr PARAMS ((tree));
|
|
extern void expand_builtin_init_dwarf_reg_sizes PARAMS ((tree));
|
|
extern rtx expand_builtin_frob_return_addr PARAMS ((tree));
|
|
extern rtx expand_builtin_dwarf_sp_column PARAMS ((void));
|
|
extern void expand_builtin_eh_return PARAMS ((tree, tree));
|
|
extern void expand_eh_return PARAMS ((void));
|
|
extern rtx get_exception_pointer PARAMS ((struct function *));
|
|
extern int duplicate_eh_regions PARAMS ((struct function *,
|
|
struct inline_remap *));
|
|
|
|
extern void sjlj_emit_function_exit_after PARAMS ((rtx));
|
|
|
|
|
|
/* If non-NULL, this is a function that returns an expression to be
|
|
executed if an unhandled exception is propagated out of a cleanup
|
|
region. For example, in C++, an exception thrown by a destructor
|
|
during stack unwinding is required to result in a call to
|
|
`std::terminate', so the C++ version of this function returns a
|
|
CALL_EXPR for `std::terminate'. */
|
|
extern tree (*lang_protect_cleanup_actions) PARAMS ((void));
|
|
|
|
/* Return true if type A catches type B. */
|
|
extern int (*lang_eh_type_covers) PARAMS ((tree a, tree b));
|
|
|
|
/* Map a type to a runtime object to match type. */
|
|
extern tree (*lang_eh_runtime_type) PARAMS ((tree));
|
|
|
|
#ifndef GCC_VARRAY_H
|
|
#undef varray_type
|
|
#endif
|
|
|
|
|
|
/* Just because the user configured --with-sjlj-exceptions=no doesn't
|
|
mean that we can use call frame exceptions. Detect that the target
|
|
has appropriate support. */
|
|
|
|
#if ! (defined (EH_RETURN_DATA_REGNO) \
|
|
&& (defined (IA64_UNWIND_INFO) \
|
|
|| (DWARF2_UNWIND_INFO \
|
|
&& (defined (EH_RETURN_HANDLER_RTX) \
|
|
|| defined (HAVE_eh_return)))))
|
|
#define MUST_USE_SJLJ_EXCEPTIONS 1
|
|
#else
|
|
#define MUST_USE_SJLJ_EXCEPTIONS 0
|
|
#endif
|
|
|
|
#ifdef CONFIG_SJLJ_EXCEPTIONS
|
|
# if CONFIG_SJLJ_EXCEPTIONS == 1
|
|
# define USING_SJLJ_EXCEPTIONS 1
|
|
# endif
|
|
# if CONFIG_SJLJ_EXCEPTIONS == 0
|
|
# define USING_SJLJ_EXCEPTIONS 0
|
|
# ifndef EH_RETURN_DATA_REGNO
|
|
#error "EH_RETURN_DATA_REGNO required"
|
|
# endif
|
|
# if !defined(EH_RETURN_HANDLER_RTX) && !defined(HAVE_eh_return)
|
|
#error "EH_RETURN_HANDLER_RTX or eh_return required"
|
|
# endif
|
|
# if !defined(DWARF2_UNWIND_INFO) && !defined(IA64_UNWIND_INFO)
|
|
#error "{DWARF2,IA64}_UNWIND_INFO required"
|
|
# endif
|
|
# endif
|
|
#else
|
|
# define USING_SJLJ_EXCEPTIONS MUST_USE_SJLJ_EXCEPTIONS
|
|
#endif
|