| /* 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; |
| |
| /* 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); |
| |
| /* 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)); |
| |
| /* Invokes CALLBACK for every exception region in the current function. */ |
| extern void for_each_eh_region (void (*) (struct eh_region *)); |
| |
| /* 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 TREE_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 check_handled (tree, tree); |
| |
| extern void sjlj_emit_function_exit_after (rtx); |
| /* APPLE LOCAL begin LLVM */ |
| extern void default_init_unwind_resume_libfunc (void); |
| /* APPLE LOCAL end LLVM */ |
| |
| 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 (TARGET_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(TARGET_UNWIND_INFO) |
| #error "{DWARF2,TARGET}_UNWIND_INFO required" |
| # endif |
| # endif |
| #else |
| # define USING_SJLJ_EXCEPTIONS MUST_USE_SJLJ_EXCEPTIONS |
| #endif |