/* Exception Handling interface routines. Copyright (C) 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2007, 2008 Free Software Foundation, Inc. Contributed by Mike Stump . 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 3, 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 COPYING3. If not see . */ 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 *); /* 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, bool); extern bool can_throw_internal (const_rtx); extern bool can_throw_external_1 (int, bool); extern bool can_throw_external (const_rtx); /* Set TREE_NOTHROW and cfun->all_throwers_are_sibcalls. */ extern unsigned int 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 unsigned int 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 (const char *); 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 (void); extern rtx get_exception_filter (void); typedef tree (*duplicate_eh_regions_map) (tree, void *); extern int duplicate_eh_regions (struct function *, duplicate_eh_regions_map, void *, int, int); extern void sjlj_emit_function_exit_after (rtx); extern void default_init_unwind_resume_libfunc (void); 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); extern void verify_eh_tree (struct function *); extern void dump_eh_tree (FILE *, struct function *); extern bool eh_region_outer_p (struct function *, int, int); extern int eh_region_outermost (struct function *, int, int); /* 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 gimple (*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 0 # else # define MUST_USE_SJLJ_EXCEPTIONS 1 # 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 # if !defined(EH_RETURN_DATA_REGNO) #error "EH_RETURN_DATA_REGNO required" # endif # if ! (defined(TARGET_UNWIND_INFO) || DWARF2_UNWIND_INFO) #error "{DWARF2,TARGET}_UNWIND_INFO required" # endif # if !defined(TARGET_UNWIND_INFO) \ && !(defined(EH_RETURN_HANDLER_RTX) || defined(HAVE_eh_return)) #error "EH_RETURN_HANDLER_RTX or eh_return required" # endif /* Usually the above error checks will have already triggered an error, but backends may set MUST_USE_SJLJ_EXCEPTIONS for their own reasons. */ # if MUST_USE_SJLJ_EXCEPTIONS #error "Must use SJLJ exceptions but configured not to" # endif # endif #else # define USING_SJLJ_EXCEPTIONS MUST_USE_SJLJ_EXCEPTIONS #endif struct throw_stmt_node GTY(()) { gimple stmt; int region_nr; }; extern struct htab *get_eh_throw_stmt_table (struct function *); extern void set_eh_throw_stmt_table (struct function *, struct htab *);