183 lines
6.7 KiB
C++
183 lines
6.7 KiB
C++
/* Exception Handling interface routines.
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Copyright (C) 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005
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Free Software Foundation, Inc.
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Contributed by Mike Stump <mrs@cygnus.com>.
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This file is part of GCC.
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GCC is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free
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Software Foundation; either version 2, or (at your option) any later
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version.
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GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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for more details.
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You should have received a copy of the GNU General Public License
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along with GCC; see the file COPYING. If not, write to the Free
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Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301, USA. */
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struct function;
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/* Per-function EH data. Used only in except.c, but GC and others
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manipulate pointers to the opaque type. */
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struct eh_status;
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/* Internal structure describing a region. */
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struct eh_region;
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/* Test: is exception handling turned on? */
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extern int doing_eh (int);
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/* Note that the current EH region (if any) may contain a throw, or a
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call to a function which itself may contain a throw. */
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extern void note_eh_region_may_contain_throw (struct eh_region *);
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extern void note_current_region_may_contain_throw (void);
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/* Invokes CALLBACK for every exception handler label. Only used by old
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loop hackery; should not be used by new code. */
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extern void for_each_eh_label (void (*) (rtx));
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/* Invokes CALLBACK for every exception region in the current function. */
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extern void for_each_eh_region (void (*) (struct eh_region *));
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/* Determine if the given INSN can throw an exception. */
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extern bool can_throw_internal_1 (int, bool);
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extern bool can_throw_internal (rtx);
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extern bool can_throw_external_1 (int, bool);
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extern bool can_throw_external (rtx);
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/* Set TREE_NOTHROW and cfun->all_throwers_are_sibcalls. */
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extern unsigned int set_nothrow_function_flags (void);
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/* After initial rtl generation, call back to finish generating
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exception support code. */
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extern void finish_eh_generation (void);
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extern void init_eh (void);
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extern void init_eh_for_function (void);
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extern rtx reachable_handlers (rtx);
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extern void maybe_remove_eh_handler (rtx);
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extern void convert_from_eh_region_ranges (void);
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extern unsigned int convert_to_eh_region_ranges (void);
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extern void find_exception_handler_labels (void);
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extern bool current_function_has_exception_handlers (void);
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extern void output_function_exception_table (void);
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extern void expand_builtin_unwind_init (void);
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extern rtx expand_builtin_eh_return_data_regno (tree);
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extern rtx expand_builtin_extract_return_addr (tree);
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extern void expand_builtin_init_dwarf_reg_sizes (tree);
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extern rtx expand_builtin_frob_return_addr (tree);
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extern rtx expand_builtin_dwarf_sp_column (void);
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extern void expand_builtin_eh_return (tree, tree);
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extern void expand_eh_return (void);
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extern rtx expand_builtin_extend_pointer (tree);
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extern rtx get_exception_pointer (struct function *);
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extern rtx get_exception_filter (struct function *);
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typedef tree (*duplicate_eh_regions_map) (tree, void *);
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extern int duplicate_eh_regions (struct function *, duplicate_eh_regions_map,
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void *, int, int);
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extern void sjlj_emit_function_exit_after (rtx);
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extern void default_init_unwind_resume_libfunc (void);
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extern struct eh_region *gen_eh_region_cleanup (struct eh_region *,
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struct eh_region *);
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extern struct eh_region *gen_eh_region_try (struct eh_region *);
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extern struct eh_region *gen_eh_region_catch (struct eh_region *, tree);
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extern struct eh_region *gen_eh_region_allowed (struct eh_region *, tree);
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extern struct eh_region *gen_eh_region_must_not_throw (struct eh_region *);
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extern int get_eh_region_number (struct eh_region *);
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extern bool get_eh_region_may_contain_throw (struct eh_region *);
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extern tree get_eh_region_tree_label (struct eh_region *);
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extern void set_eh_region_tree_label (struct eh_region *, tree);
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extern void foreach_reachable_handler (int, bool,
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void (*) (struct eh_region *, void *),
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void *);
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extern void collect_eh_region_array (void);
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extern void expand_resx_expr (tree);
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extern void verify_eh_tree (struct function *);
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extern void dump_eh_tree (FILE *, struct function *);
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extern bool eh_region_outer_p (struct function *, int, int);
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extern int eh_region_outermost (struct function *, int, int);
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/* tree-eh.c */
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extern void add_stmt_to_eh_region_fn (struct function *, tree, int);
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extern bool remove_stmt_from_eh_region_fn (struct function *, tree);
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extern int lookup_stmt_eh_region_fn (struct function *, tree);
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extern int lookup_stmt_eh_region (tree);
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extern bool verify_eh_edges (tree);
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/* If non-NULL, this is a function that returns an expression to be
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executed if an unhandled exception is propagated out of a cleanup
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region. For example, in C++, an exception thrown by a destructor
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during stack unwinding is required to result in a call to
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`std::terminate', so the C++ version of this function returns a
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CALL_EXPR for `std::terminate'. */
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extern tree (*lang_protect_cleanup_actions) (void);
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/* Return true if type A catches type B. */
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extern int (*lang_eh_type_covers) (tree a, tree b);
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/* Map a type to a runtime object to match type. */
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extern tree (*lang_eh_runtime_type) (tree);
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/* Just because the user configured --with-sjlj-exceptions=no doesn't
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mean that we can use call frame exceptions. Detect that the target
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has appropriate support. */
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#ifndef MUST_USE_SJLJ_EXCEPTIONS
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# if !(defined (EH_RETURN_DATA_REGNO) \
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&& (defined (TARGET_UNWIND_INFO) \
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|| (DWARF2_UNWIND_INFO \
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&& (defined (EH_RETURN_HANDLER_RTX) \
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|| defined (HAVE_eh_return)))))
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# define MUST_USE_SJLJ_EXCEPTIONS 1
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# else
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# define MUST_USE_SJLJ_EXCEPTIONS 0
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# endif
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#endif
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#ifdef CONFIG_SJLJ_EXCEPTIONS
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# if CONFIG_SJLJ_EXCEPTIONS == 1
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# define USING_SJLJ_EXCEPTIONS 1
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# endif
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# if CONFIG_SJLJ_EXCEPTIONS == 0
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# define USING_SJLJ_EXCEPTIONS 0
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# ifndef EH_RETURN_DATA_REGNO
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#error "EH_RETURN_DATA_REGNO required"
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# endif
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# if !defined(EH_RETURN_HANDLER_RTX) && !defined(HAVE_eh_return)
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#error "EH_RETURN_HANDLER_RTX or eh_return required"
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# endif
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# if !defined(DWARF2_UNWIND_INFO) && !defined(TARGET_UNWIND_INFO)
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#error "{DWARF2,TARGET}_UNWIND_INFO required"
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# endif
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# endif
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#else
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# define USING_SJLJ_EXCEPTIONS MUST_USE_SJLJ_EXCEPTIONS
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#endif
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struct throw_stmt_node GTY(())
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{
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tree stmt;
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int region_nr;
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};
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extern struct htab *get_eh_throw_stmt_table (struct function *);
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extern void set_eh_throw_stmt_table (struct function *, struct htab *);
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#ifdef ENABLE_CHECKING
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extern void verify_eh_throw_table_statements (void);
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#endif
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