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/* Exception Handling interface routines.
Copyright (C) 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004
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. */
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 (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 (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 (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 (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 (tree);
/* End a catch clause. Control will resume after the try/catch block. */
extern void expand_end_catch (void);
/* End a sequence of catch handlers for a try block. */
extern void expand_end_all_catch (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 (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 (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 (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 (tree);
/* End some sort of EH region, depending on the argument. */
extern void expand_eh_handler (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 (struct eh_region *);
extern void note_current_region_may_contain_throw (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 (void (*) (rtx));
/* Determine if the given INSN can throw an exception. */
extern bool can_throw_internal_1 (int);
extern bool can_throw_internal (rtx);
extern bool can_throw_external_1 (int);
extern bool can_throw_external (rtx);
/* Set current_function_nothrow and cfun->all_throwers_are_sibcalls. */
extern void set_nothrow_function_flags (void);
/* After initial rtl generation, call back to finish generating
exception support code. */
extern void finish_eh_generation (void);
extern void init_eh (void);
extern void init_eh_for_function (void);
extern rtx reachable_handlers (rtx);
extern void maybe_remove_eh_handler (rtx);
extern void convert_from_eh_region_ranges (void);
extern void convert_to_eh_region_ranges (void);
extern void find_exception_handler_labels (void);
extern bool current_function_has_exception_handlers (void);
extern void output_function_exception_table (void);
extern void expand_builtin_unwind_init (void);
extern rtx expand_builtin_eh_return_data_regno (tree);
extern rtx expand_builtin_extract_return_addr (tree);
extern void expand_builtin_init_dwarf_reg_sizes (tree);
extern rtx expand_builtin_frob_return_addr (tree);
extern rtx expand_builtin_dwarf_sp_column (void);
extern void expand_builtin_eh_return (tree, tree);
extern void expand_eh_return (void);
extern rtx expand_builtin_extend_pointer (tree);
extern rtx get_exception_pointer (struct function *);
extern rtx get_exception_filter (struct function *);
extern int duplicate_eh_regions (struct function *, struct inline_remap *);
extern int check_handled (tree, tree);
extern void sjlj_emit_function_exit_after (rtx);
extern struct eh_region *gen_eh_region_cleanup (struct eh_region *,
struct eh_region *);
extern struct eh_region *gen_eh_region_try (struct eh_region *);
extern struct eh_region *gen_eh_region_catch (struct eh_region *, tree);
extern struct eh_region *gen_eh_region_allowed (struct eh_region *, tree);
extern struct eh_region *gen_eh_region_must_not_throw (struct eh_region *);
extern int get_eh_region_number (struct eh_region *);
extern bool get_eh_region_may_contain_throw (struct eh_region *);
extern tree get_eh_region_tree_label (struct eh_region *);
extern void set_eh_region_tree_label (struct eh_region *, tree);
extern void foreach_reachable_handler (int, bool,
void (*) (struct eh_region *, void *),
void *);
extern void collect_eh_region_array (void);
extern void expand_resx_expr (tree);
/* tree-eh.c */
extern int lookup_stmt_eh_region (tree);
/* 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) (void);
/* Return true if type A catches type B. */
extern int (*lang_eh_type_covers) (tree a, tree b);
/* Map a type to a runtime object to match type. */
extern tree (*lang_eh_runtime_type) (tree);
/* 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. */
#ifndef MUST_USE_SJLJ_EXCEPTIONS
# 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
#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
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