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/* Exception Handling interface routines.
Copyright (C) 1996, 1997, 1998, 1999, 2000, 2001
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 TREE_CODE
union tree_node;
#define tree union tree_node *
#endif
#ifndef RTX_CODE
struct rtx_def;
#define rtx struct rtx_def *
#endif
#ifndef GCC_VARRAY_H
struct varray_head_tag;
#define varray_type struct varray_head_tag *
#endif
/* 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 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 ocurrs. */
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));
/* Begin a region that will contain entries created with
add_partial_entry. */
extern void begin_protect_partials PARAMS ((void));
/* Create a new exception region and add the handler for the region
onto a list. These regions will be ended (and their handlers emitted)
when end_protect_partials is invoked. */
extern void add_partial_entry PARAMS ((tree));
/* End all of the pending exception regions that have handlers added with
add_partial_entry. */
extern void end_protect_partials PARAMS ((void));
/* A list of labels used for exception handlers. */
extern rtx exception_handler_labels;
/* Determine if the given INSN can throw an exception. */
extern bool can_throw_internal PARAMS ((rtx));
extern bool can_throw_external PARAMS ((rtx));
/* Return nonzero if nothing in this function can throw. */
extern bool nothrow_function_p 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 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_fp_regnum 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 *));
struct function;
struct inline_remap;
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 propogated 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 TREE_CODE
#undef tree
#endif
#ifndef RTX_CODE
#undef rtx
#endif
#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_STACKADJ_RTX) \
&& (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
# ifndef EH_RETURN_STACKADJ_RTX
#error "EH_RETURN_STACKADJ_RTX 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
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