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);
/* 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 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 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);
+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
# define USING_SJLJ_EXCEPTIONS MUST_USE_SJLJ_EXCEPTIONS
#endif
-struct throw_stmt_node GTY(())
-{
+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 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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