Open64: osprey-gcc-4.2.0/gcc/except.h Source File

00001 /* Exception Handling interface routines.
00002    Copyright (C) 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005
00003    Free Software Foundation, Inc.
00004    Contributed by Mike Stump <mrs@cygnus.com>.
00005 
00006 This file is part of GCC.
00007 
00008 GCC is free software; you can redistribute it and/or modify it under
00009 the terms of the GNU General Public License as published by the Free
00010 Software Foundation; either version 2, or (at your option) any later
00011 version.
00012 
00013 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
00014 WARRANTY; without even the implied warranty of MERCHANTABILITY or
00015 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
00016 for more details.
00017 
00018 You should have received a copy of the GNU General Public License
00019 along with GCC; see the file COPYING.  If not, write to the Free
00020 Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
00021 02110-1301, USA.  */
00022 
00023 
00024 struct function;
00025 
00026 /* Per-function EH data.  Used only in except.c, but GC and others
00027    manipulate pointers to the opaque type.  */
00028 struct eh_status;
00029 
00030 /* Internal structure describing a region.  */
00031 struct eh_region;
00032 
00033 /* Test: is exception handling turned on?  */
00034 extern int doing_eh (int);
00035 
00036 /* Note that the current EH region (if any) may contain a throw, or a
00037    call to a function which itself may contain a throw.  */
00038 extern void note_eh_region_may_contain_throw (struct eh_region *);
00039 extern void note_current_region_may_contain_throw (void);
00040 
00041 /* Invokes CALLBACK for every exception handler label.  Only used by old
00042    loop hackery; should not be used by new code.  */
00043 extern void for_each_eh_label (void (*) (rtx));
00044 
00045 /* Invokes CALLBACK for every exception region in the current function.  */
00046 extern void for_each_eh_region (void (*) (struct eh_region *));
00047 
00048 /* Determine if the given INSN can throw an exception.  */
00049 extern bool can_throw_internal_1 (int, bool);
00050 extern bool can_throw_internal (rtx);
00051 extern bool can_throw_external_1 (int, bool);
00052 extern bool can_throw_external (rtx);
00053 
00054 /* Set TREE_NOTHROW and cfun->all_throwers_are_sibcalls.  */
00055 extern unsigned int set_nothrow_function_flags (void);
00056 
00057 /* After initial rtl generation, call back to finish generating
00058    exception support code.  */
00059 extern void finish_eh_generation (void);
00060 
00061 extern void init_eh (void);
00062 extern void init_eh_for_function (void);
00063 
00064 extern rtx reachable_handlers (rtx);
00065 extern void maybe_remove_eh_handler (rtx);
00066 
00067 extern void convert_from_eh_region_ranges (void);
00068 extern unsigned int convert_to_eh_region_ranges (void);
00069 extern void find_exception_handler_labels (void);
00070 extern bool current_function_has_exception_handlers (void);
00071 extern void output_function_exception_table (void);
00072 
00073 extern void expand_builtin_unwind_init (void);
00074 extern rtx expand_builtin_eh_return_data_regno (tree);
00075 extern rtx expand_builtin_extract_return_addr (tree);
00076 extern void expand_builtin_init_dwarf_reg_sizes (tree);
00077 extern rtx expand_builtin_frob_return_addr (tree);
00078 extern rtx expand_builtin_dwarf_sp_column (void);
00079 extern void expand_builtin_eh_return (tree, tree);
00080 extern void expand_eh_return (void);
00081 extern rtx expand_builtin_extend_pointer (tree);
00082 extern rtx get_exception_pointer (struct function *);
00083 extern rtx get_exception_filter (struct function *);
00084 typedef tree (*duplicate_eh_regions_map) (tree, void *);
00085 extern int duplicate_eh_regions (struct function *, duplicate_eh_regions_map,
00086          void *, int, int);
00087 
00088 extern void sjlj_emit_function_exit_after (rtx);
00089 extern void default_init_unwind_resume_libfunc (void);
00090 
00091 extern struct eh_region *gen_eh_region_cleanup (struct eh_region *,
00092             struct eh_region *);
00093 extern struct eh_region *gen_eh_region_try (struct eh_region *);
00094 extern struct eh_region *gen_eh_region_catch (struct eh_region *, tree);
00095 extern struct eh_region *gen_eh_region_allowed (struct eh_region *, tree);
00096 extern struct eh_region *gen_eh_region_must_not_throw (struct eh_region *);
00097 extern int get_eh_region_number (struct eh_region *);
00098 extern bool get_eh_region_may_contain_throw (struct eh_region *);
00099 extern tree get_eh_region_tree_label (struct eh_region *);
00100 extern void set_eh_region_tree_label (struct eh_region *, tree);
00101 
00102 extern void foreach_reachable_handler (int, bool,
00103                void (*) (struct eh_region *, void *),
00104                void *);
00105 
00106 extern void collect_eh_region_array (void);
00107 extern void expand_resx_expr (tree);
00108 extern void verify_eh_tree (struct function *);
00109 extern void dump_eh_tree (FILE *, struct function *);
00110 extern bool eh_region_outer_p (struct function *, int, int);
00111 extern int eh_region_outermost (struct function *, int, int);
00112 
00113 /* tree-eh.c */
00114 extern void add_stmt_to_eh_region_fn (struct function *, tree, int);
00115 extern bool remove_stmt_from_eh_region_fn (struct function *, tree);
00116 extern int lookup_stmt_eh_region_fn (struct function *, tree);
00117 extern int lookup_stmt_eh_region (tree);
00118 extern bool verify_eh_edges (tree);
00119 
00120 /* If non-NULL, this is a function that returns an expression to be
00121    executed if an unhandled exception is propagated out of a cleanup
00122    region.  For example, in C++, an exception thrown by a destructor
00123    during stack unwinding is required to result in a call to
00124    `std::terminate', so the C++ version of this function returns a
00125    CALL_EXPR for `std::terminate'.  */
00126 extern tree (*lang_protect_cleanup_actions) (void);
00127 
00128 /* Return true if type A catches type B.  */
00129 extern int (*lang_eh_type_covers) (tree a, tree b);
00130 
00131 /* Map a type to a runtime object to match type.  */
00132 extern tree (*lang_eh_runtime_type) (tree);
00133 
00134 
00135 /* Just because the user configured --with-sjlj-exceptions=no doesn't
00136    mean that we can use call frame exceptions.  Detect that the target
00137    has appropriate support.  */
00138 
00139 #ifndef MUST_USE_SJLJ_EXCEPTIONS
00140 # if !(defined (EH_RETURN_DATA_REGNO)     \
00141        && (defined (TARGET_UNWIND_INFO)     \
00142      || (DWARF2_UNWIND_INFO     \
00143          && (defined (EH_RETURN_HANDLER_RTX)  \
00144        || defined (HAVE_eh_return)))))
00145 #  define MUST_USE_SJLJ_EXCEPTIONS  1
00146 # else
00147 #  define MUST_USE_SJLJ_EXCEPTIONS  0
00148 # endif
00149 #endif
00150 
00151 #ifdef CONFIG_SJLJ_EXCEPTIONS
00152 # if CONFIG_SJLJ_EXCEPTIONS == 1
00153 #  define USING_SJLJ_EXCEPTIONS   1
00154 # endif
00155 # if CONFIG_SJLJ_EXCEPTIONS == 0
00156 #  define USING_SJLJ_EXCEPTIONS   0
00157 #  ifndef EH_RETURN_DATA_REGNO
00158     #error "EH_RETURN_DATA_REGNO required"
00159 #  endif
00160 #  if !defined(EH_RETURN_HANDLER_RTX) && !defined(HAVE_eh_return)
00161     #error "EH_RETURN_HANDLER_RTX or eh_return required"
00162 #  endif
00163 #  if !defined(DWARF2_UNWIND_INFO) && !defined(TARGET_UNWIND_INFO)
00164     #error "{DWARF2,TARGET}_UNWIND_INFO required"
00165 #  endif
00166 # endif
00167 #else
00168 # define USING_SJLJ_EXCEPTIONS    MUST_USE_SJLJ_EXCEPTIONS
00169 #endif
00170 
00171 struct throw_stmt_node GTY(())
00172 {
00173   tree stmt;
00174   int region_nr;
00175 };
00176 
00177 extern struct htab *get_eh_throw_stmt_table (struct function *);
00178 extern void set_eh_throw_stmt_table (struct function *, struct htab *);
00179 
00180 #ifdef ENABLE_CHECKING
00181 extern void verify_eh_throw_table_statements (void);
00182 #endif