/* Exception Handling interface routines.
- Copyright (C) 1996 Free Software Foundation, Inc.
+ Copyright (C) 1996, 1997 Free Software Foundation, Inc.
Contributed by Mike Stump <mrs@cygnus.com>.
This file is part of GNU CC.
the Free Software Foundation, 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
-
-#ifndef GET_CODE
-#define rtx int *
+#if !defined(NULL_RTX) && !defined(rtx)
+typedef struct rtx_def *_except_rtx;
+#define rtx _except_rtx
#endif
+/* The label generated by expand_builtin_eh_return. */
+
+extern rtx eh_return_stub_label;
+
#ifdef TREE_CODE
/* A stack of labels. CHAIN points to the next entry in the stack. */
/* An eh_entry is used to describe one exception handling region.
- START_LABEL is the label corresponding to the start of the region.
-
- END_LABEL is the label corresponding to the end of the region.
+ OUTER_CONTEXT is the label used for rethrowing into the outer context.
EXCEPTION_HANDLER_LABEL is the label corresponding to the handler
for this region.
+ LABEL_USED indicates whether a CATCH block has already used this
+ label or not. New ones are needed for additional catch blocks if
+ it has.
+
+ FALSE_LABEL is used when either setjmp/longjmp exceptions are in
+ use, or old style table exceptions. It contains the label for
+ branching to the next runtime type check as handlers are processed.
+
FINALIZATION is the tree codes for the handler, or is NULL_TREE if
one hasn't been generated yet, or is integer_zero_node to mark the
end of a group of try blocks. */
struct eh_entry {
- rtx start_label;
- rtx end_label;
+ rtx outer_context;
rtx exception_handler_label;
-
tree finalization;
+ int label_used;
+ rtx false_label;
};
/* A list of EH_ENTRYs. ENTRY is the entry; CHAIN points to the next
struct eh_node *tail;
};
-
/* Start an exception handling region. All instructions emitted after
this point are considered to be part of the region until
expand_eh_region_end () is invoked. */
#endif
-struct function;
+/* Test: is exception handling turned on? */
+
+extern int doing_eh PROTO ((int));
/* Toplevel initialization for EH. */
+void set_exception_lang_code PROTO((int));
+void set_exception_version_code PROTO((int));
+
+/* A list of handlers asocciated with an exception region. HANDLER_LABEL
+ is the the label that control should be transfered to if the data
+ in TYPE_INFO matches an exception. a value of NULL_TREE for TYPE_INFO
+ means This is a cleanup, and must always be called. A value of
+ CATCH_ALL_TYPE works like a cleanup, but a call to the runtime matcher
+ is still performed to avoid being caught by a different language
+ exception. NEXT is a pointer to the next handler for this region.
+ NULL means there are no more. */
+
+typedef struct handler_info
+{
+ rtx handler_label;
+ void *type_info;
+ struct handler_info *next;
+} handler_info;
+
+
+/* Add a new eh_entry for this function, The parameter specifies what
+ exception region number NOTE insns use to delimit this range.
+ The integer returned is uniquely identifies this exception range
+ within an internal table. */
+
+int new_eh_region_entry PROTO((int));
+
+/* Add new handler information to an exception range. The first parameter
+ specifies the range number (returned from new_eh_entry()). The second
+ parameter specifies the handler. By default the handler is inserted at
+ the end of the list. A handler list may contain only ONE NULL_TREE
+ typeinfo entry. Regardless where it is positioned, a NULL_TREE entry
+ is always output as the LAST handler in the exception table for a region. */
+
+void add_new_handler PROTO((int, struct handler_info *));
+
+/* Remove a handler label. The handler label is being deleted, so all
+ regions which reference this handler should have it removed from their
+ list of possible handlers. Any region which has the final handler
+ removed can be deleted. */
+
+void remove_handler PROTO((rtx));
+
+/* Create a new handler structure initialized with the handler label and
+ typeinfo fields passed in. */
+
+struct handler_info *get_new_handler PROTO((rtx, void *));
+
+/* Make a duplicate of an exception region by copying all the handlers
+ for an exception region. Return the new handler index. */
+
+int duplicate_handlers PROTO((int, int));
+
+
+/* Get a pointer to the first handler in an exception region's list. */
+
+struct handler_info *get_first_handler PROTO((int));
+
+/* Find all the runtime handlers type matches currently referenced */
+
+int find_all_handler_type_matches PROTO((void ***));
+
extern void init_eh PROTO((void));
/* Initialization for the per-function EH data. */
extern void init_eh_for_function PROTO((void));
-/* Saves the current per-function EH data into P. */
-
-extern void save_eh_status PROTO((struct function *p));
+/* Generate an exception label. Use instead of gen_label_rtx */
-/* Restores the per-function EH data from P. */
-
-extern void restore_eh_status PROTO((struct function *p));
+extern rtx gen_exception_label PROTO((void));
/* Adds an EH table entry for EH entry number N. Called from
final_scan_insn for NOTE_INSN_EH_REGION_BEG. */
extern void add_eh_table_entry PROTO((int n));
+/* Start a catch clause, triggered by runtime value paramter. */
+
+#ifdef TREE_CODE
+extern void start_catch_handler PROTO((tree));
+#endif
+
+/* End an individual catch clause. */
+
+extern void end_catch_handler PROTO((void));
+
/* Returns a non-zero value if we need to output an exception table. */
extern int exception_table_p PROTO((void));
extern void end_protect_partials PROTO((void));
-/* An internal throw with a direct CONTEXT we want to throw
- from. CONTEXT must be a label. */
+/* An internal throw. */
-extern void expand_internal_throw PROTO((rtx context));
+extern void expand_internal_throw PROTO((void));
/* Called from expand_exception_blocks and expand_end_catch_block to
expand and pending handlers. */
extern void expand_leftover_cleanups PROTO((void));
-/* If necessary, emit insns for the start of per-function unwinder for
- the current function. */
+/* If necessary, emit insns to get EH context for the current
+ function. */
-extern void emit_unwinder PROTO((void));
-
-/* If necessary, emit insns for the end of the per-function unwinder
- for the current function. */
-
-extern void end_eh_unwinder PROTO((void));
+extern void emit_eh_context PROTO((void));
/* Builds a list of handler labels and puts them in the global
variable exception_handler_labels. */
extern void find_exception_handler_labels PROTO((void));
+/* Determine if an arbitrary label is an exception label */
+
+extern int is_exception_handler_label PROTO((int));
+
/* Performs sanity checking on the check_exception_handler_labels
list. */
extern struct label_node *caught_return_label_stack;
+/* Keeps track of the label used as the context of a throw to rethrow an
+ exception to the outer exception region. */
+
+extern struct label_node *outer_context_label_stack;
+
/* A random area used for purposes elsewhere. */
extern struct label_node *false_label_stack;
extern rtx exception_handler_labels;
-/* The rtx for the saved PC value. */
-
-extern rtx eh_saved_pc_rtx;
-
/* Performs optimizations for exception handling, such as removing
unnecessary exception regions. Invoked from jump_optimize (). */
extern void exception_optimize PROTO((void));
+/* Return EH context (and set it up once per fn). */
+extern rtx get_eh_context PROTO((void));
+
/* Get the dynamic handler chain. */
extern rtx get_dynamic_handler_chain PROTO((void));
#ifdef TREE_CODE
extern tree protect_with_terminate PROTO((tree));
#endif
+
+extern void expand_fixup_region_start PROTO((void));
+#ifdef TREE_CODE
+extern void expand_fixup_region_end PROTO((tree));
+#endif
+
+/* Various hooks for the DWARF 2 __throw routine. */
+
+void expand_builtin_unwind_init PROTO((void));
+rtx expand_builtin_dwarf_fp_regnum PROTO((void));
+#ifdef TREE_CODE
+rtx expand_builtin_frob_return_addr PROTO((tree));
+rtx expand_builtin_extract_return_addr PROTO((tree));
+rtx expand_builtin_dwarf_reg_size PROTO((tree, rtx));
+void expand_builtin_eh_return PROTO((tree, tree, tree));
+#endif
+void expand_eh_return PROTO((void));
+
+
+/* Checking whether 2 instructions are within the same exception region. */
+
+int in_same_eh_region PROTO((rtx, rtx));
+void free_insn_eh_region PROTO((void));
+void init_insn_eh_region PROTO((rtx, int));
+
+#ifdef rtx
+#undef rtx
+#endif
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