/* Exception Handling interface routines.
- Copyright (C) 1996 Free Software Foundation, Inc.
+ Copyright (C) 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005,
+ 2007 Free Software Foundation, Inc.
Contributed by Mike Stump <mrs@cygnus.com>.
-This file is part of GNU CC.
+This file is part of GCC.
-GNU CC 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 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.
-GNU CC 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.
+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 GNU CC; see the file COPYING. If not, write to
-the Free Software Foundation, 59 Temple Place - Suite 330,
-Boston, MA 02111-1307, USA. */
+along with GCC; see the file COPYING3. If not see
+<http://www.gnu.org/licenses/>. */
-#ifndef GET_CODE
-#define rtx int *
-#endif
-
-#ifdef TREE_CODE
-
-struct label_node {
- union {
- rtx rlabel;
- tree tlabel;
- } u;
- struct label_node *chain;
-};
-
-/* A entry for the exception handling stack EHSTACK or the exception
- handling queue EHQUEUE. */
-struct eh_entry {
- rtx start_label;
- rtx end_label;
- rtx exception_handler_label;
-
- tree finalization;
-};
-
-struct eh_node {
- struct eh_entry *entry;
- struct eh_node *chain;
-};
-
-struct eh_stack {
- struct eh_node *top;
-};
-
-struct eh_queue {
- struct eh_node *head;
- struct eh_node *tail;
-};
-
-
-extern void push_label_entry PROTO((struct label_node **labelstack, rtx rlabel, tree tlabel));
-extern rtx pop_label_entry PROTO((struct label_node **labelstack));
-extern tree top_label_entry PROTO((struct label_node **labelstack));
-
-extern struct eh_stack ehstack;
-extern struct eh_queue ehqueue;
-extern rtx catch_clauses;
-extern tree protect_list;
-
-#endif
-
struct function;
-extern void init_eh PROTO((void));
-extern void init_eh_for_function PROTO((void));
-extern void save_eh_status PROTO((struct function *p));
-extern void restore_eh_status PROTO((struct function *p));
-extern void add_eh_table_entry PROTO((int));
-extern int exception_table_p PROTO((void));
-extern void output_exception_table PROTO((void));
-extern rtx eh_outer_context PROTO((rtx));
-extern void emit_unwinder PROTO((void));
-extern void end_eh_unwinder PROTO((void));
-extern void find_handler_labels PROTO((void));
-extern void check_handler_labels PROTO((void));
-
-
-extern struct label_node *caught_return_label_stack;
-extern struct label_node *false_label_stack;
-
-extern rtx exception_handler_labels;
+/* 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, bool);
+extern bool can_throw_internal (rtx);
+extern bool can_throw_external_1 (int, bool);
+extern bool can_throw_external (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 (struct function *);
+extern rtx get_exception_filter (struct function *);
+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);
+
+/* tree-eh.c */
+extern void add_stmt_to_eh_region_fn (struct function *, tree, int);
+extern bool remove_stmt_from_eh_region_fn (struct function *, tree);
+extern int lookup_stmt_eh_region_fn (struct function *, tree);
+extern int lookup_stmt_eh_region (tree);
+extern bool verify_eh_edges (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
-/* The rtx for the saved PC value. */
+#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
-extern rtx eh_saved_pc_rtx;
+struct throw_stmt_node GTY(())
+{
+ tree stmt;
+ int region_nr;
+};
-extern void exception_optimize PROTO((void));
+extern struct htab *get_eh_throw_stmt_table (struct function *);
+extern void set_eh_throw_stmt_table (struct function *, struct htab *);
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