/* Exception Handling interface routines.
- Copyright (C) 1996 Free Software Foundation, Inc.
+ Copyright (C) 1996, 1997, 1998, 1999, 2000, 2001, 2002
+ 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 GET_CODE
-#define rtx int *
+#ifndef GCC_VARRAY_H
+struct varray_head_tag;
+#define varray_type struct varray_head_tag *
#endif
-#ifdef TREE_CODE
+struct function;
-struct label_node {
- union {
- rtx rlabel;
- tree tlabel;
- } u;
- struct label_node *chain;
-};
+struct inline_remap;
-/* 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;
+/* Per-function EH data. Used only in except.c, but GC and others
+ manipulate pointers to the opaque type. */
+struct eh_status;
- tree finalization;
-};
+/* Internal structure describing a region. */
+struct eh_region;
-struct eh_node {
- struct eh_entry *entry;
- struct eh_node *chain;
-};
+/* Test: is exception handling turned on? */
+extern int doing_eh PARAMS ((int));
-struct eh_stack {
- struct eh_node *top;
-};
+/* 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));
-struct eh_queue {
- struct eh_node *head;
- struct eh_node *tail;
-};
+/* 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 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));
+/* Begin a catch clause. TYPE is an object to be matched by the
+ runtime, or a list of such objects, or null if this is a catch-all
+ clause. */
+extern void expand_start_catch PARAMS ((tree));
-extern struct eh_stack ehstack;
-extern struct eh_queue ehqueue;
-extern rtx catch_clauses;
-extern tree protect_list;
+/* End a catch clause. Control will resume after the try/catch block. */
+extern void expand_end_catch PARAMS ((void));
-#endif
+/* End a sequence of catch handlers for a try block. */
+extern void expand_end_all_catch PARAMS ((void));
-struct function;
+/* 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 occurs. */
+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));
+
+/* 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 PARAMS ((void (*) (rtx)));
+
+/* Determine if the given INSN can throw an exception. */
+extern bool can_throw_internal PARAMS ((rtx));
+extern bool can_throw_external PARAMS ((rtx));
+
+/* Set current_function_nothrow and cfun->all_throwers_are_sibcalls. */
+extern void set_nothrow_function_flags PARAMS ((void));
-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));
+/* 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 struct label_node *caught_return_label_stack;
-extern struct label_node *false_label_stack;
+extern rtx reachable_handlers PARAMS ((rtx));
+extern void maybe_remove_eh_handler PARAMS ((rtx));
-extern rtx exception_handler_labels;
+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 bool current_function_has_exception_handlers PARAMS ((void));
+extern void output_function_exception_table PARAMS ((void));
-/* The rtx for the saved PC value. */
+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 void expand_builtin_init_dwarf_reg_sizes PARAMS ((tree));
+extern rtx expand_builtin_frob_return_addr PARAMS ((tree));
+extern rtx expand_builtin_dwarf_fp_regnum PARAMS ((void));
+extern void expand_builtin_eh_return PARAMS ((tree, tree));
+extern void expand_eh_return PARAMS ((void));
+extern rtx get_exception_pointer PARAMS ((struct function *));
+extern int duplicate_eh_regions PARAMS ((struct function *,
+ struct inline_remap *));
-extern rtx eh_saved_pc_rtx;
+extern void sjlj_emit_function_exit_after PARAMS ((rtx));
-extern void exception_optimize PROTO((void));
+
+/* 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) PARAMS ((void));
+
+/* Return true if type A catches type B. */
+extern int (*lang_eh_type_covers) PARAMS ((tree a, tree b));
+
+/* Map a type to a runtime object to match type. */
+extern tree (*lang_eh_runtime_type) PARAMS ((tree));
+
+#ifndef GCC_VARRAY_H
+#undef varray_type
+#endif
+
+
+/* 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 (IA64_UNWIND_INFO) \
+ || (DWARF2_UNWIND_INFO \
+ && defined (EH_RETURN_STACKADJ_RTX) \
+ && (defined (EH_RETURN_HANDLER_RTX) \
+ || defined (HAVE_eh_return)))))
+#define MUST_USE_SJLJ_EXCEPTIONS 1
+#else
+#define MUST_USE_SJLJ_EXCEPTIONS 0
+#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
+# 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"
+# endif
+# endif
+#else
+# define USING_SJLJ_EXCEPTIONS MUST_USE_SJLJ_EXCEPTIONS
+#endif
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