/* Exception Handling interface routines.
|
/* Exception Handling interface routines.
|
Copyright (C) 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005,
|
Copyright (C) 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005,
|
2007 Free Software Foundation, Inc.
|
2007 Free Software Foundation, Inc.
|
Contributed by Mike Stump <mrs@cygnus.com>.
|
Contributed by Mike Stump <mrs@cygnus.com>.
|
|
|
This file is part of GCC.
|
This file is part of GCC.
|
|
|
GCC is free software; you can redistribute it and/or modify it under
|
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
|
the terms of the GNU General Public License as published by the Free
|
Software Foundation; either version 3, or (at your option) any later
|
Software Foundation; either version 3, or (at your option) any later
|
version.
|
version.
|
|
|
GCC is distributed in the hope that it will be useful, but WITHOUT ANY
|
GCC is distributed in the hope that it will be useful, but WITHOUT ANY
|
WARRANTY; without even the implied warranty of MERCHANTABILITY or
|
WARRANTY; without even the implied warranty of MERCHANTABILITY or
|
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
|
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
|
for more details.
|
for more details.
|
|
|
You should have received a copy of the GNU General Public License
|
You should have received a copy of the GNU General Public License
|
along with GCC; see the file COPYING3. If not see
|
along with GCC; see the file COPYING3. If not see
|
<http://www.gnu.org/licenses/>. */
|
<http://www.gnu.org/licenses/>. */
|
|
|
|
|
struct function;
|
struct function;
|
|
|
/* Per-function EH data. Used only in except.c, but GC and others
|
/* Per-function EH data. Used only in except.c, but GC and others
|
manipulate pointers to the opaque type. */
|
manipulate pointers to the opaque type. */
|
struct eh_status;
|
struct eh_status;
|
|
|
/* Internal structure describing a region. */
|
/* Internal structure describing a region. */
|
struct eh_region;
|
struct eh_region;
|
|
|
/* Test: is exception handling turned on? */
|
/* Test: is exception handling turned on? */
|
extern int doing_eh (int);
|
extern int doing_eh (int);
|
|
|
/* Note that the current EH region (if any) may contain a throw, or a
|
/* Note that the current EH region (if any) may contain a throw, or a
|
call to a function which itself may contain a throw. */
|
call to a function which itself may contain a throw. */
|
extern void note_eh_region_may_contain_throw (struct eh_region *);
|
extern void note_eh_region_may_contain_throw (struct eh_region *);
|
extern void note_current_region_may_contain_throw (void);
|
extern void note_current_region_may_contain_throw (void);
|
|
|
/* Invokes CALLBACK for every exception handler label. Only used by old
|
/* Invokes CALLBACK for every exception handler label. Only used by old
|
loop hackery; should not be used by new code. */
|
loop hackery; should not be used by new code. */
|
extern void for_each_eh_label (void (*) (rtx));
|
extern void for_each_eh_label (void (*) (rtx));
|
|
|
/* Invokes CALLBACK for every exception region in the current function. */
|
/* Invokes CALLBACK for every exception region in the current function. */
|
extern void for_each_eh_region (void (*) (struct eh_region *));
|
extern void for_each_eh_region (void (*) (struct eh_region *));
|
|
|
/* Determine if the given INSN can throw an exception. */
|
/* Determine if the given INSN can throw an exception. */
|
extern bool can_throw_internal_1 (int, bool);
|
extern bool can_throw_internal_1 (int, bool);
|
extern bool can_throw_internal (rtx);
|
extern bool can_throw_internal (rtx);
|
extern bool can_throw_external_1 (int, bool);
|
extern bool can_throw_external_1 (int, bool);
|
extern bool can_throw_external (rtx);
|
extern bool can_throw_external (rtx);
|
|
|
/* Set TREE_NOTHROW and cfun->all_throwers_are_sibcalls. */
|
/* Set TREE_NOTHROW and cfun->all_throwers_are_sibcalls. */
|
extern unsigned int set_nothrow_function_flags (void);
|
extern unsigned int set_nothrow_function_flags (void);
|
|
|
/* After initial rtl generation, call back to finish generating
|
/* After initial rtl generation, call back to finish generating
|
exception support code. */
|
exception support code. */
|
extern void finish_eh_generation (void);
|
extern void finish_eh_generation (void);
|
|
|
extern void init_eh (void);
|
extern void init_eh (void);
|
extern void init_eh_for_function (void);
|
extern void init_eh_for_function (void);
|
|
|
extern rtx reachable_handlers (rtx);
|
extern rtx reachable_handlers (rtx);
|
extern void maybe_remove_eh_handler (rtx);
|
extern void maybe_remove_eh_handler (rtx);
|
|
|
extern void convert_from_eh_region_ranges (void);
|
extern void convert_from_eh_region_ranges (void);
|
extern unsigned int convert_to_eh_region_ranges (void);
|
extern unsigned int convert_to_eh_region_ranges (void);
|
extern void find_exception_handler_labels (void);
|
extern void find_exception_handler_labels (void);
|
extern bool current_function_has_exception_handlers (void);
|
extern bool current_function_has_exception_handlers (void);
|
extern void output_function_exception_table (void);
|
extern void output_function_exception_table (void);
|
|
|
extern void expand_builtin_unwind_init (void);
|
extern void expand_builtin_unwind_init (void);
|
extern rtx expand_builtin_eh_return_data_regno (tree);
|
extern rtx expand_builtin_eh_return_data_regno (tree);
|
extern rtx expand_builtin_extract_return_addr (tree);
|
extern rtx expand_builtin_extract_return_addr (tree);
|
extern void expand_builtin_init_dwarf_reg_sizes (tree);
|
extern void expand_builtin_init_dwarf_reg_sizes (tree);
|
extern rtx expand_builtin_frob_return_addr (tree);
|
extern rtx expand_builtin_frob_return_addr (tree);
|
extern rtx expand_builtin_dwarf_sp_column (void);
|
extern rtx expand_builtin_dwarf_sp_column (void);
|
extern void expand_builtin_eh_return (tree, tree);
|
extern void expand_builtin_eh_return (tree, tree);
|
extern void expand_eh_return (void);
|
extern void expand_eh_return (void);
|
extern rtx expand_builtin_extend_pointer (tree);
|
extern rtx expand_builtin_extend_pointer (tree);
|
extern rtx get_exception_pointer (struct function *);
|
extern rtx get_exception_pointer (struct function *);
|
extern rtx get_exception_filter (struct function *);
|
extern rtx get_exception_filter (struct function *);
|
typedef tree (*duplicate_eh_regions_map) (tree, void *);
|
typedef tree (*duplicate_eh_regions_map) (tree, void *);
|
extern int duplicate_eh_regions (struct function *, duplicate_eh_regions_map,
|
extern int duplicate_eh_regions (struct function *, duplicate_eh_regions_map,
|
void *, int, int);
|
void *, int, int);
|
|
|
extern void sjlj_emit_function_exit_after (rtx);
|
extern void sjlj_emit_function_exit_after (rtx);
|
extern void default_init_unwind_resume_libfunc (void);
|
extern void default_init_unwind_resume_libfunc (void);
|
|
|
extern struct eh_region *gen_eh_region_cleanup (struct eh_region *,
|
extern struct eh_region *gen_eh_region_cleanup (struct eh_region *,
|
struct eh_region *);
|
struct eh_region *);
|
extern struct eh_region *gen_eh_region_try (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_catch (struct eh_region *, tree);
|
extern struct eh_region *gen_eh_region_allowed (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 struct eh_region *gen_eh_region_must_not_throw (struct eh_region *);
|
extern int get_eh_region_number (struct eh_region *);
|
extern int get_eh_region_number (struct eh_region *);
|
extern bool get_eh_region_may_contain_throw (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 tree get_eh_region_tree_label (struct eh_region *);
|
extern void set_eh_region_tree_label (struct eh_region *, tree);
|
extern void set_eh_region_tree_label (struct eh_region *, tree);
|
|
|
extern void foreach_reachable_handler (int, bool,
|
extern void foreach_reachable_handler (int, bool,
|
void (*) (struct eh_region *, void *),
|
void (*) (struct eh_region *, void *),
|
void *);
|
void *);
|
|
|
extern void collect_eh_region_array (void);
|
extern void collect_eh_region_array (void);
|
extern void expand_resx_expr (tree);
|
extern void expand_resx_expr (tree);
|
extern void verify_eh_tree (struct function *);
|
extern void verify_eh_tree (struct function *);
|
extern void dump_eh_tree (FILE *, struct function *);
|
extern void dump_eh_tree (FILE *, struct function *);
|
extern bool eh_region_outer_p (struct function *, int, int);
|
extern bool eh_region_outer_p (struct function *, int, int);
|
extern int eh_region_outermost (struct function *, int, int);
|
extern int eh_region_outermost (struct function *, int, int);
|
|
|
/* tree-eh.c */
|
/* tree-eh.c */
|
extern void add_stmt_to_eh_region_fn (struct function *, tree, int);
|
extern void add_stmt_to_eh_region_fn (struct function *, tree, int);
|
extern bool remove_stmt_from_eh_region_fn (struct function *, tree);
|
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_fn (struct function *, tree);
|
extern int lookup_stmt_eh_region (tree);
|
extern int lookup_stmt_eh_region (tree);
|
extern bool verify_eh_edges (tree);
|
extern bool verify_eh_edges (tree);
|
|
|
/* If non-NULL, this is a function that returns an expression to be
|
/* If non-NULL, this is a function that returns an expression to be
|
executed if an unhandled exception is propagated out of a cleanup
|
executed if an unhandled exception is propagated out of a cleanup
|
region. For example, in C++, an exception thrown by a destructor
|
region. For example, in C++, an exception thrown by a destructor
|
during stack unwinding is required to result in a call to
|
during stack unwinding is required to result in a call to
|
`std::terminate', so the C++ version of this function returns a
|
`std::terminate', so the C++ version of this function returns a
|
CALL_EXPR for `std::terminate'. */
|
CALL_EXPR for `std::terminate'. */
|
extern tree (*lang_protect_cleanup_actions) (void);
|
extern tree (*lang_protect_cleanup_actions) (void);
|
|
|
/* Return true if type A catches type B. */
|
/* Return true if type A catches type B. */
|
extern int (*lang_eh_type_covers) (tree a, tree b);
|
extern int (*lang_eh_type_covers) (tree a, tree b);
|
|
|
/* Map a type to a runtime object to match type. */
|
/* Map a type to a runtime object to match type. */
|
extern tree (*lang_eh_runtime_type) (tree);
|
extern tree (*lang_eh_runtime_type) (tree);
|
|
|
|
|
/* Just because the user configured --with-sjlj-exceptions=no doesn't
|
/* Just because the user configured --with-sjlj-exceptions=no doesn't
|
mean that we can use call frame exceptions. Detect that the target
|
mean that we can use call frame exceptions. Detect that the target
|
has appropriate support. */
|
has appropriate support. */
|
|
|
#ifndef MUST_USE_SJLJ_EXCEPTIONS
|
#ifndef MUST_USE_SJLJ_EXCEPTIONS
|
# if !(defined (EH_RETURN_DATA_REGNO) \
|
# if !(defined (EH_RETURN_DATA_REGNO) \
|
&& (defined (TARGET_UNWIND_INFO) \
|
&& (defined (TARGET_UNWIND_INFO) \
|
|| (DWARF2_UNWIND_INFO \
|
|| (DWARF2_UNWIND_INFO \
|
&& (defined (EH_RETURN_HANDLER_RTX) \
|
&& (defined (EH_RETURN_HANDLER_RTX) \
|
|| defined (HAVE_eh_return)))))
|
|| defined (HAVE_eh_return)))))
|
# define MUST_USE_SJLJ_EXCEPTIONS 1
|
# define MUST_USE_SJLJ_EXCEPTIONS 1
|
# else
|
# else
|
# define MUST_USE_SJLJ_EXCEPTIONS 0
|
# define MUST_USE_SJLJ_EXCEPTIONS 0
|
# endif
|
# endif
|
#endif
|
#endif
|
|
|
#ifdef CONFIG_SJLJ_EXCEPTIONS
|
#ifdef CONFIG_SJLJ_EXCEPTIONS
|
# if CONFIG_SJLJ_EXCEPTIONS == 1
|
# if CONFIG_SJLJ_EXCEPTIONS == 1
|
# define USING_SJLJ_EXCEPTIONS 1
|
# define USING_SJLJ_EXCEPTIONS 1
|
# endif
|
# endif
|
# if CONFIG_SJLJ_EXCEPTIONS == 0
|
# if CONFIG_SJLJ_EXCEPTIONS == 0
|
# define USING_SJLJ_EXCEPTIONS 0
|
# define USING_SJLJ_EXCEPTIONS 0
|
# ifndef EH_RETURN_DATA_REGNO
|
# ifndef EH_RETURN_DATA_REGNO
|
#error "EH_RETURN_DATA_REGNO required"
|
#error "EH_RETURN_DATA_REGNO required"
|
# endif
|
# endif
|
# if !defined(EH_RETURN_HANDLER_RTX) && !defined(HAVE_eh_return)
|
# if !defined(EH_RETURN_HANDLER_RTX) && !defined(HAVE_eh_return)
|
#error "EH_RETURN_HANDLER_RTX or eh_return required"
|
#error "EH_RETURN_HANDLER_RTX or eh_return required"
|
# endif
|
# endif
|
# if !defined(DWARF2_UNWIND_INFO) && !defined(TARGET_UNWIND_INFO)
|
# if !defined(DWARF2_UNWIND_INFO) && !defined(TARGET_UNWIND_INFO)
|
#error "{DWARF2,TARGET}_UNWIND_INFO required"
|
#error "{DWARF2,TARGET}_UNWIND_INFO required"
|
# endif
|
# endif
|
# endif
|
# endif
|
#else
|
#else
|
# define USING_SJLJ_EXCEPTIONS MUST_USE_SJLJ_EXCEPTIONS
|
# define USING_SJLJ_EXCEPTIONS MUST_USE_SJLJ_EXCEPTIONS
|
#endif
|
#endif
|
|
|
struct throw_stmt_node GTY(())
|
struct throw_stmt_node GTY(())
|
{
|
{
|
tree stmt;
|
tree stmt;
|
int region_nr;
|
int region_nr;
|
};
|
};
|
|
|
extern struct htab *get_eh_throw_stmt_table (struct function *);
|
extern struct htab *get_eh_throw_stmt_table (struct function *);
|
extern void set_eh_throw_stmt_table (struct function *, struct htab *);
|
extern void set_eh_throw_stmt_table (struct function *, struct htab *);
|
|
|
#ifdef ENABLE_CHECKING
|
#ifdef ENABLE_CHECKING
|
extern void verify_eh_throw_table_statements (void);
|
extern void verify_eh_throw_table_statements (void);
|
#endif
|
#endif
|
|
|
