/* Exception Handling interface routines.
Copyright (C) 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005,
- 2007 Free Software Foundation, Inc.
+ 2007, 2008, 2009 Free Software Foundation, Inc.
Contributed by Mike Stump <mrs@cygnus.com>.
This file is part of GCC.
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;
+/* The type of an exception region. */
+enum eh_region_type
+{
+ ERT_UNKNOWN = 0,
+ ERT_CLEANUP,
+ ERT_TRY,
+ ERT_CATCH,
+ ERT_ALLOWED_EXCEPTIONS,
+ ERT_MUST_NOT_THROW,
+ ERT_THROW
+};
+
+/* Describes one exception region. */
+struct GTY(()) eh_region_d
+{
+ /* The immediately surrounding region. */
+ struct eh_region_d *outer;
+
+ /* The list of immediately contained regions. */
+ struct eh_region_d *inner;
+ struct eh_region_d *next_peer;
+
+ /* List of regions sharing label. */
+ struct eh_region_d *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 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_d *eh_catch;
+ struct eh_region_d *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_d *next_catch;
+ struct eh_region_d *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;
+ } 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_d *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_d *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);
+extern void note_eh_region_may_contain_throw (struct eh_region_d *);
/* 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));
/* 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_d *));
/* 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, bool);
extern bool can_throw_internal (const_rtx);
-extern bool can_throw_external_1 (int, bool);
+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 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, int);
extern void sjlj_emit_function_exit_after (rtx);
extern void default_init_unwind_resume_libfunc (void);
-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 *),
+extern struct eh_region_d *gen_eh_region_cleanup (struct eh_region_d *);
+extern struct eh_region_d *gen_eh_region_try (struct eh_region_d *);
+extern struct eh_region_d *gen_eh_region_catch (struct eh_region_d *, tree);
+extern struct eh_region_d *gen_eh_region_allowed (struct eh_region_d *, tree);
+extern struct eh_region_d *gen_eh_region_must_not_throw (struct eh_region_d *);
+extern int get_eh_region_number (struct eh_region_d *);
+extern bool get_eh_region_may_contain_throw (struct eh_region_d *);
+extern tree get_eh_region_no_tree_label (int);
+extern tree get_eh_region_tree_label (struct eh_region_d *);
+extern void set_eh_region_tree_label (struct eh_region_d *, tree);
+
+extern void foreach_reachable_handler (int, bool, bool,
+ void (*) (struct eh_region_d *, 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 *);
-extern bool eh_region_outer_p (struct function *, int, int);
+void debug_eh_tree (struct function *);
extern int eh_region_outermost (struct function *, int, int);
-
-/* 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);
+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 *);
+extern void remove_unreachable_regions (sbitmap, sbitmap);
+extern VEC(int,heap) * label_to_region_map (void);
+extern int num_eh_regions (void);
+extern bitmap must_not_throw_labels (void);
+extern struct eh_region_d *redirect_eh_edge_to_label (struct edge_def *, tree, bool, bool, int);
+extern int get_next_region_sharing_label (int);
OSDN Git Service
