-/* Copyright (C) 1997 Free Software Foundation, Inc.
- This file is part of GNU CC. */
+/* EH stuff
+ Copyright (C) 1997, 1998, 1999, 2000 Free Software Foundation, Inc.
+
+This file is part of GNU CC.
+
+This program 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.
+
+This program 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 this program; if not, write to the Free Software
+Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
+
/* This file contains the structures required for the language
independant exception handling model. Both the static compiler and
the runtime library share this file. */
-/* The compiler flag NEW_EH_MODEL is used to determine whether the
+/* The runtime flag flag_new_exceptions is used to determine whether the
compiler supports the new runtime typechecking mechanism or not. Under
the new model, runtime info is contained in the exception table, and
the __throw() library routine determines which handler to call based
checking of runtime conditions. If the handler wasn't suppose to
get the exception, it performs a re-throw. */
-#include "gansidecl.h"
-
-
-#ifndef NEW_EH_MODEL
-
-struct eh_context
-{
- void **dynamic_handler_chain;
- /* This is language dependent part of the eh context. */
- void *info;
-};
-
-#else
/* The handler_label field MUST be the first field in this structure. The
__throw() library routine expects uses __eh_stub() from except.c, which
- simply dereferences the context pointer to get the handler */
+ simply dereferences the context pointer to get the handler.
+ The routine get_dynamic_handler_chain() also has a dependancy on
+ the location of 'dynamic_handler_chain'. If its location is changed,
+ that routine must be modified as well. */
struct eh_context
{
void **dynamic_handler_chain;
/* This is language dependent part of the eh context. */
void *info;
+ /* This is used to remember where we threw for re-throws */
+ void *table_index; /* address of exception table entry to rethrow from */
};
-#endif
-
-
#ifndef EH_TABLE_LOOKUP
-#ifndef NEW_EH_MODEL
-
-typedef struct exception_table
+typedef struct old_exception_table
{
void *start_region;
void *end_region;
void *exception_handler;
-} exception_table;
-
-typedef exception_table exception_descriptor;
-
-#else
+} old_exception_table;
typedef struct exception_table
{
short version;
} exception_lang_info;
+/* This value in the first field of the exception descriptor
+ identifies the descriptor as the new model format. This value would never
+ be present in this location under the old model */
+
+#define NEW_EH_RUNTIME ((void *) -2)
+
/* Each function has an exception_descriptor which contains the
language info, and a table of exception ranges and handlers */
typedef struct exception_descriptor
{
+ void *runtime_id_field;
exception_lang_info lang;
exception_table table[1];
} exception_descriptor;
+struct __eh_info; /* forward declaration */
/* A pointer to a matching function is initialized at runtime by the
specific language if run-time exceptions are supported.
3 - exception table region is in (exception descriptor *)
*/
-typedef void * (*__eh_matcher) PROTO ((void *, void *, void *));
+typedef void * (*__eh_matcher) PARAMS ((struct __eh_info *, void *,
+ struct exception_descriptor *));
+
+/* This value is to be checked as a 'match all' case in the runtime field. */
+
+#define CATCH_ALL_TYPE ((void *) -1)
/* This is the runtime exception information. This forms the minimum required
information for an exception info pointer in an eh_context structure. */
+
typedef struct __eh_info
{
__eh_matcher match_function;
- void *coerced_value;
short language;
short version;
} __eh_info;
EH_LANG_Mips_Assembler = 0x8001
};
-#endif
-
#endif /* EH_TABLE_LOOKUP */
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