/* Exception Handling interface routines.
- Copyright (C) 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005
- Free Software Foundation, Inc.
+ Copyright (C) 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005,
+ 2007, 2008 Free Software Foundation, Inc.
Contributed by Mike Stump <mrs@cygnus.com>.
This file is part of GCC.
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
+Software Foundation; either version 3, or (at your option) any later
version.
GCC is distributed in the hope that it will be useful, but WITHOUT ANY
for more details.
You should have received a copy of the GNU General Public License
-along with GCC; see the file COPYING. If not, write to the Free
-Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
-02110-1301, USA. */
+along with GCC; see the file COPYING3. If not see
+<http://www.gnu.org/licenses/>. */
+#include "sbitmap.h"
+#include "vecprim.h"
struct function;
-/* Per-function EH data. Used only in except.c, but GC and others
- manipulate pointers to the opaque type. */
-struct eh_status;
+/* Describes one exception region. */
+struct GTY(()) eh_region
+{
+ /* The immediately surrounding region. */
+ struct eh_region *outer;
+
+ /* The list of immediately contained regions. */
+ struct eh_region *inner;
+ struct eh_region *next_peer;
+
+ /* List of regions sharing label. */
+ struct eh_region *next_region_sharing_label;
+
+ /* An identifier for this region. */
+ int region_number;
+
+ /* When a region is deleted, its parents inherit the REG_EH_REGION
+ numbers already assigned. */
+ bitmap aka;
+
+ /* Each region does exactly one thing. */
+ enum eh_region_type
+ {
+ ERT_UNKNOWN = 0,
+ ERT_CLEANUP,
+ ERT_TRY,
+ ERT_CATCH,
+ ERT_ALLOWED_EXCEPTIONS,
+ ERT_MUST_NOT_THROW,
+ ERT_THROW
+ } type;
+
+ /* Holds the action to perform based on the preceding type. */
+ union eh_region_u {
+ /* A list of catch blocks, a surrounding try block,
+ and the label for continuing after a catch. */
+ struct eh_region_u_try {
+ struct eh_region *eh_catch;
+ struct eh_region *last_catch;
+ } GTY ((tag ("ERT_TRY"))) eh_try;
+
+ /* The list through the catch handlers, the list of type objects
+ matched, and the list of associated filters. */
+ struct eh_region_u_catch {
+ struct eh_region *next_catch;
+ struct eh_region *prev_catch;
+ tree type_list;
+ tree filter_list;
+ } GTY ((tag ("ERT_CATCH"))) eh_catch;
+
+ /* A tree_list of allowed types. */
+ struct eh_region_u_allowed {
+ tree type_list;
+ int filter;
+ } GTY ((tag ("ERT_ALLOWED_EXCEPTIONS"))) allowed;
+
+ /* The type given by a call to "throw foo();", or discovered
+ for a throw. */
+ struct eh_region_u_throw {
+ tree type;
+ } GTY ((tag ("ERT_THROW"))) eh_throw;
+
+ /* Retain the cleanup expression even after expansion so that
+ we can match up fixup regions. */
+ struct eh_region_u_cleanup {
+ struct eh_region *prev_try;
+ } GTY ((tag ("ERT_CLEANUP"))) cleanup;
+ } GTY ((desc ("%0.type"))) u;
+
+ /* Entry point for this region's handler before landing pads are built. */
+ rtx label;
+ tree tree_label;
+
+ /* Entry point for this region's handler from the runtime eh library. */
+ rtx landing_pad;
+
+ /* Entry point for this region's handler from an inner region. */
+ rtx post_landing_pad;
+
+ /* The RESX insn for handing off control to the next outermost handler,
+ if appropriate. */
+ rtx resume;
+
+ /* True if something in this region may throw. */
+ unsigned may_contain_throw : 1;
+};
+
+typedef struct eh_region *eh_region;
+DEF_VEC_P(eh_region);
+DEF_VEC_ALLOC_P(eh_region, gc);
+DEF_VEC_ALLOC_P(eh_region, heap);
+
+/* Per-function EH data. Used to save exception status for each
+ function. */
+struct GTY(()) eh_status
+{
+ /* The tree of all regions for this function. */
+ struct eh_region *region_tree;
+
+ /* The same information as an indexable array. */
+ VEC(eh_region,gc) *region_array;
+ int last_region_number;
+
+ htab_t GTY((param_is (struct throw_stmt_node))) throw_stmt_table;
+};
-/* 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_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);
+extern bool can_throw_internal_1 (int, bool, bool);
+extern bool can_throw_internal (const_rtx);
+extern bool can_throw_external_1 (int, bool, bool);
+extern bool can_throw_external (const_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 remove_eh_region (int);
+extern void remove_eh_region_and_replace_by_outer_of (int, int);
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 (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 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 *);
+extern rtx get_exception_pointer (void);
+extern rtx get_exception_filter (void);
typedef tree (*duplicate_eh_regions_map) (tree, void *);
-extern int duplicate_eh_regions (struct function *, duplicate_eh_regions_map, void *, int);
+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_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_no_tree_label (int);
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,
+extern void foreach_reachable_handler (int, bool, bool,
void (*) (struct eh_region *, void *),
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);
+void debug_eh_tree (struct function *);
+extern int eh_region_outermost (struct function *, int, int);
+extern void add_type_for_runtime (tree);
+extern tree lookup_type_for_runtime (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
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);
+extern gimple (*lang_protect_cleanup_actions) (void);
/* Return true if type A catches type B. */
extern int (*lang_eh_type_covers) (tree a, tree b);
has appropriate support. */
#ifndef MUST_USE_SJLJ_EXCEPTIONS
-# if !(defined (EH_RETURN_DATA_REGNO) \
+# 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
+ || defined (HAVE_eh_return))))
# define MUST_USE_SJLJ_EXCEPTIONS 0
+# else
+# define MUST_USE_SJLJ_EXCEPTIONS 1
# endif
#endif
# endif
# if CONFIG_SJLJ_EXCEPTIONS == 0
# define USING_SJLJ_EXCEPTIONS 0
-# ifndef EH_RETURN_DATA_REGNO
+# if !defined(EH_RETURN_DATA_REGNO)
#error "EH_RETURN_DATA_REGNO required"
# endif
-# if !defined(EH_RETURN_HANDLER_RTX) && !defined(HAVE_eh_return)
+# if ! (defined(TARGET_UNWIND_INFO) || DWARF2_UNWIND_INFO)
+ #error "{DWARF2,TARGET}_UNWIND_INFO required"
+# endif
+# if !defined(TARGET_UNWIND_INFO) \
+ && !(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"
+/* Usually the above error checks will have already triggered an
+ error, but backends may set MUST_USE_SJLJ_EXCEPTIONS for their own
+ reasons. */
+# if MUST_USE_SJLJ_EXCEPTIONS
+ #error "Must use SJLJ exceptions but configured not to"
# endif
# endif
#else
# define USING_SJLJ_EXCEPTIONS MUST_USE_SJLJ_EXCEPTIONS
#endif
-struct throw_stmt_node GTY(())
-{
- tree stmt;
+struct GTY(()) throw_stmt_node {
+ gimple 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 *);
-
-#ifdef ENABLE_CHECKING
-extern void verify_eh_throw_table_statements (void);
-#endif
+extern void remove_unreachable_regions (sbitmap, sbitmap);
+extern VEC(int,heap) * label_to_region_map (void);
+extern int num_eh_regions (void);
+extern struct eh_region *redirect_eh_edge_to_label (struct edge_def *, tree, bool, bool, int);
+extern int get_next_region_sharing_label (int);
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