/* Exception Handling interface routines.
- Copyright (C) 1996, 1997, 1998, 1999, 2000 Free Software Foundation, Inc.
+ Copyright (C) 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005
+ 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 2, 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 COPYING. If not, write to the Free
+Software Foundation, 59 Temple Place - Suite 330, Boston, MA
+02111-1307, USA. */
-#ifndef TREE_CODE
-union tree_node;
-#define tree union tree_node *
-#endif
-
-#ifndef RTX_CODE
-struct rtx_def;
-#define rtx struct rtx_def *
-#endif
-
-#ifndef _VARRAY_H_
-struct varray_head_tag;
-#define varray_type struct varray_head_tag *
-#endif
-
+struct function;
/* Per-function EH data. Used only in except.c, but GC and others
manipulate pointers to the opaque type. */
struct eh_region;
/* Test: is exception handling turned on? */
-extern int doing_eh PARAMS ((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 PARAMS ((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 PARAMS ((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 PARAMS ((void));
+extern int doing_eh (int);
-/* Begin a catch clause. TYPE is an object to be matched by the
- runtime, or null if this is a catch-all clause. */
-extern void expand_start_catch PARAMS ((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);
-/* End a catch clause. Control will resume after the try/catch block. */
-extern void expand_end_catch PARAMS ((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));
-/* End a sequence of catch handlers for a try block. */
-extern void expand_end_all_catch PARAMS ((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 ocurrs. */
-extern void expand_eh_region_end_allowed PARAMS ((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 PARAMS ((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 PARAMS ((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 PARAMS ((tree));
-
-/* Begin a region that will contain entries created with
- add_partial_entry. */
-extern void begin_protect_partials PARAMS ((void));
-
-/* Create a new exception region and add the handler for the region
- onto a list. These regions will be ended (and their handlers emitted)
- when end_protect_partials is invoked. */
-extern void add_partial_entry PARAMS ((tree));
-
-/* End all of the pending exception regions that have handlers added with
- add_partial_entry. */
-extern void end_protect_partials PARAMS ((void));
-
-
-/* A list of labels used for exception handlers. */
-extern rtx exception_handler_labels;
+/* 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 PARAMS ((rtx));
-extern bool can_throw_external PARAMS ((rtx));
+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);
-/* Return nonzero if nothing in this function can throw. */
-extern bool nothrow_function_p PARAMS ((void));
+/* 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 PARAMS ((void));
-
-extern void init_eh PARAMS ((void));
-extern void init_eh_for_function PARAMS ((void));
-
-extern rtx reachable_handlers PARAMS ((rtx));
-extern void maybe_remove_eh_handler PARAMS ((rtx));
-
-extern void convert_from_eh_region_ranges PARAMS ((void));
-extern void convert_to_eh_region_ranges PARAMS ((void));
-extern void find_exception_handler_labels PARAMS ((void));
-extern void output_function_exception_table PARAMS ((void));
-
-extern void expand_builtin_unwind_init PARAMS ((void));
-extern rtx expand_builtin_eh_return_data_regno PARAMS ((tree));
-extern rtx expand_builtin_extract_return_addr PARAMS ((tree));
-extern rtx expand_builtin_frob_return_addr PARAMS ((tree));
-extern void expand_builtin_eh_return PARAMS ((tree, tree));
-extern void expand_eh_return PARAMS ((void));
-
-extern rtx get_exception_pointer PARAMS ((void));
-
-struct function;
-struct inline_remap;
-extern int duplicate_eh_regions PARAMS ((struct function *,
- struct inline_remap *));
-
-extern void sjlj_emit_function_exit_after PARAMS ((rtx));
-
-
-/* Nonzero to protect cleanup actions with must-not-throw regions. */
-extern tree protect_cleanup_actions;
+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 *);
+typedef tree (*duplicate_eh_regions_map) (tree, void *);
+extern int duplicate_eh_regions (struct function *, duplicate_eh_regions_map, void *, int);
+
+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);
+extern void verify_eh_tree (struct function *);
+extern void dump_eh_tree (FILE *, struct function *);
+
+/* 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. */
-int (*lang_eh_type_covers) PARAMS ((tree a, tree b));
+extern int (*lang_eh_type_covers) (tree a, tree b);
/* Map a type to a runtime object to match type. */
-tree (*lang_eh_runtime_type) PARAMS ((tree));
-
-#ifndef TREE_CODE
-#undef tree
-#endif
-
-#ifndef RTX_CODE
-#undef rtx
-#endif
-
-#ifndef _VARRAY_H_
-#undef varray_type
-#endif
+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. */
-#if !defined (EH_RETURN_DATA_REGNO) \
- || !defined(EH_RETURN_STACKADJ_RTX) \
- || ! (defined(EH_RETURN_HANDLER_RTX) \
- || defined(HAVE_eh_return)) \
- || ! (defined(DWARF2_UNWIND_INFO) \
- || defined(IA64_UNWIND_INFO))
-#define MUST_USE_SJLJ_EXCEPTIONS 1
-#else
-#define MUST_USE_SJLJ_EXCEPTIONS 0
+#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
# ifndef EH_RETURN_DATA_REGNO
#error "EH_RETURN_DATA_REGNO required"
# endif
-# ifndef EH_RETURN_STACKADJ_RTX
- #error "EH_RETURN_STACKADJ_RTX 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"
+# 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
+
+struct throw_stmt_node GTY(())
+{
+ tree 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 *);
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