Virgin import of gcc from EGCS 1.1.2

1 files changed, 385 insertions, 0 deletions

diff --git a/contrib/gcc/except.h b/contrib/gcc/except.h
new file mode 100644
index 0000000..c08d0c5
--- /dev/null
+++ b/contrib/gcc/except.h
@@ -0,0 +1,385 @@
+/* Exception Handling interface routines.
+   Copyright (C) 1996, 1997 Free Software Foundation, Inc.
+   Contributed by Mike Stump <mrs@cygnus.com>.
+
+This file is part of GNU CC.
+
+GNU CC 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 version.
+
+GNU CC is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GNU CC; see the file COPYING.  If not, write to
+the Free Software Foundation, 59 Temple Place - Suite 330,
+Boston, MA 02111-1307, USA.  */
+
+#if !defined(NULL_RTX) && !defined(rtx)
+typedef struct rtx_def *_except_rtx;
+#define rtx _except_rtx
+#endif
+
+#ifdef TREE_CODE
+
+/* A stack of labels. CHAIN points to the next entry in the stack.  */
+
+struct label_node {
+  union {
+    rtx rlabel;
+    tree tlabel;
+  } u;
+  struct label_node *chain;
+};
+
+/* An eh_entry is used to describe one exception handling 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.
+
+   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 outer_context;
+  rtx exception_handler_label;
+  tree finalization;
+  int label_used;
+};
+
+/* A list of EH_ENTRYs. ENTRY is the entry; CHAIN points to the next
+   entry in the list, or is NULL if this is the last entry.  */
+
+struct eh_node {
+  struct eh_entry *entry;
+  struct eh_node *chain;
+};
+
+/* A stack of EH_ENTRYs. TOP is the topmost entry on the stack. TOP is
+   NULL if the stack is empty.  */
+
+struct eh_stack {
+  struct eh_node *top;
+};
+
+/* A queue of EH_ENTRYs. HEAD is the front of the queue; TAIL is the
+   end (the latest entry). HEAD and TAIL are NULL if the queue is
+   empty.  */
+
+struct eh_queue {
+  struct eh_node *head;
+  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.  */
+
+extern void expand_eh_region_start		PROTO((void));
+
+/* Just like expand_eh_region_start, except if a cleanup action is
+   entered on the cleanup chain, the TREE_PURPOSE of the element put
+   on the chain is DECL.  DECL should be the associated VAR_DECL, if
+   any, otherwise it should be NULL_TREE.  */
+
+extern void expand_eh_region_start_for_decl	PROTO((tree));
+
+/* Start an exception handling region for the given cleanup action.
+   All instructions emitted after this point are considered to be part
+   of the region until expand_eh_region_end () is invoked.  CLEANUP is
+   the cleanup action to perform.  The return value is true if the
+   exception region was optimized away.  If that case,
+   expand_eh_region_end does not need to be called for this cleanup,
+   nor should it be.
+
+   This routine notices one particular common case in C++ code
+   generation, and optimizes it so as to not need the exception
+   region.  */
+
+extern int expand_eh_region_start_tree		PROTO((tree, tree));
+
+/* End an exception handling region.  The information about the region
+   is found on the top of ehstack.
+
+   HANDLER is either the cleanup for the exception region, or if we're
+   marking the end of a try block, HANDLER is integer_zero_node.
+
+   HANDLER will be transformed to rtl when expand_leftover_cleanups ()
+   is invoked.  */
+
+extern void expand_eh_region_end		PROTO((tree));
+
+/* Push RLABEL or TLABEL onto LABELSTACK. Only one of RLABEL or TLABEL
+   should be set; the other must be NULL.  */
+
+extern void push_label_entry			PROTO((struct label_node **labelstack, rtx rlabel, tree tlabel));
+
+/* Pop the topmost entry from LABELSTACK and return its value as an
+   rtx node. If LABELSTACK is empty, return NULL.  */
+
+extern rtx pop_label_entry			PROTO((struct label_node **labelstack));
+
+/* Return the topmost entry of LABELSTACK as a tree node, or return
+   NULL_TREE if LABELSTACK is empty.  */
+
+extern tree top_label_entry			PROTO((struct label_node **labelstack));
+
+/* A set of insns for the catch clauses in the current function. They
+   will be emitted at the end of the current function.  */
+
+extern rtx catch_clauses;
+
+#endif
+
+/* Test: is exception handling turned on? */
+
+extern int doing_eh				       PROTO ((int));
+
+/* Toplevel initialization for EH.  */
+
+void set_exception_lang_code                    PROTO((short));
+void set_exception_version_code                 PROTO((short));
+
+/* 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));
+
+/* Generate an exception label. Use instead of gen_label_rtx */
+
+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
+
+/* Returns a non-zero value if we need to output an exception table.  */
+
+extern int exception_table_p			PROTO((void));
+
+/* Outputs the exception table if we have one.  */
+
+extern void output_exception_table		PROTO((void));
+
+/* Given a return address in ADDR, determine the address we should use
+   to find the corresponding EH region.  */
+
+extern rtx eh_outer_context			PROTO((rtx addr));
+
+/* Called at the start of a block of try statements for which there is
+   a supplied catch handler.  */
+
+extern void expand_start_try_stmts 		PROTO((void));
+
+/* Called at the start of a block of catch statements. It terminates the
+   previous set of try statements.  */
+
+extern void expand_start_all_catch		PROTO((void));
+
+/* Called at the end of a block of catch statements.  */
+
+extern void expand_end_all_catch		PROTO((void));
+
+#ifdef TREE_CODE
+/* Create a new exception region and add the handler for the region
+   onto a list. These regions will be ended (and their handlers
+   emitted) when end_protect_partials is invoked.  */
+
+extern void add_partial_entry			PROTO((tree handler));
+#endif
+
+/* End all of the pending exception regions that have handlers added with
+   push_protect_entry ().  */
+
+extern void end_protect_partials		PROTO((void));
+
+/* An internal throw.  */
+
+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 to get EH context for the current
+   function. */
+
+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 void check_exception_handler_labels	PROTO((void));
+
+/* A stack used to keep track of the label used to resume normal program
+   flow out of the current exception handler region.  */
+
+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;
+
+/* A list of labels used for exception handlers. It is created by
+   find_exception_handler_labels for the optimization passes.  */
+
+extern rtx exception_handler_labels;
+
+/* 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));
+
+/* Get the dynamic cleanup chain.  */
+extern rtx get_dynamic_cleanup_chain		PROTO((void));
+
+/* Throw an exception.  */
+
+extern void emit_throw				PROTO((void));
+
+/* One to use setjmp/longjmp method of generating code.  */
+
+extern int exceptions_via_longjmp;
+
+/* One to enable asynchronous exception support.  */
+
+extern int asynchronous_exceptions;
+
+/* One to protect cleanup actions with a handler that calls
+   __terminate, zero otherwise.  */
+
+extern int protect_cleanup_actions_with_terminate;
+
+#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));
+rtx expand_builtin_eh_stub		PROTO((void));
+rtx expand_builtin_eh_stub_old          PROTO((void));
+#ifdef TREE_CODE
+rtx expand_builtin_frob_return_addr	PROTO((tree));
+rtx expand_builtin_extract_return_addr	PROTO((tree));
+void expand_builtin_set_return_addr_reg PROTO((tree));
+void expand_builtin_set_eh_regs		PROTO((tree, tree));
+rtx expand_builtin_dwarf_reg_size	PROTO((tree, rtx));
+#endif
+
+
+/* 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