static tree get_eh_caught PROTO((void));
static tree get_eh_handlers PROTO((void));
static tree do_pop_exception PROTO((void));
+static void process_start_catch_block PROTO((tree, tree));
+static void process_start_catch_block_old PROTO((tree, tree));
+static tree build_eh_type_type_ref PROTO((tree));
#if 0
/* This is the startup, and finish stuff per exception table. */
fields[0] = build_lang_field_decl (FIELD_DECL,
get_identifier ("match_function"), ptr_type_node);
fields[1] = build_lang_field_decl (FIELD_DECL,
- get_identifier ("coerced_value"), ptr_type_node);
- fields[2] = build_lang_field_decl (FIELD_DECL,
get_identifier ("language"), short_integer_type_node);
- fields[3] = build_lang_field_decl (FIELD_DECL,
+ fields[2] = build_lang_field_decl (FIELD_DECL,
get_identifier ("version"), short_integer_type_node);
/* N.B.: The fourth field LEN is expected to be
the number of fields - 1, not the total number of fields. */
- finish_builtin_type (t1, "__eh_info", fields, 3, ptr_type_node);
+ finish_builtin_type (t1, "__eh_info", fields, 2, ptr_type_node);
t = make_lang_type (RECORD_TYPE);
fields[0] = build_lang_field_decl (FIELD_DECL,
get_identifier ("eh_info"), t1);
return build1 (ADDR_EXPR, ptr_type_node, exp);
}
+/* Build the address of a runtime type for use in the runtime matching
+ field of the new exception model */
+
+static tree
+build_eh_type_type_ref (type)
+ tree type;
+{
+ char *typestring;
+ tree exp;
+ int susp;
+
+ if (type == error_mark_node)
+ return error_mark_node;
+
+ /* peel back references, so they match. */
+ if (TREE_CODE (type) == REFERENCE_TYPE)
+ type = TREE_TYPE (type);
+
+ /* Peel off cv qualifiers. */
+ type = TYPE_MAIN_VARIANT (type);
+
+ push_obstacks_nochange ();
+ end_temporary_allocation ();
+
+ if (flag_rtti)
+ {
+ exp = get_tinfo_fn (type);
+ TREE_USED (exp) = 1;
+ mark_inline_for_output (exp);
+ exp = build1 (ADDR_EXPR, ptr_type_node, exp);
+ }
+ else
+ {
+ typestring = build_overload_name (type, 1, 1);
+ exp = combine_strings (build_string (strlen (typestring)+1, typestring));
+ exp = build1 (ADDR_EXPR, ptr_type_node, exp);
+ }
+ pop_obstacks ();
+ return (exp);
+}
+
+
/* Build a type value for use at runtime for a exp that is thrown or
matched against by the exception handling system. */
return term;
}
-/* call this to start a catch block. Typename is the typename, and identifier
+/* Call this to start a catch block. Typename is the typename, and identifier
is the variable to place the object in or NULL if the variable doesn't
matter. If typename is NULL, that means its a "catch (...)" or catch
everything. In that case we don't need to do any type checking.
expand_start_catch_block (declspecs, declarator)
tree declspecs, declarator;
{
- rtx false_label_rtx;
- tree decl = NULL_TREE;
- tree init;
+ tree decl;
if (processing_template_decl)
{
if (! doing_eh (1))
return;
+ if (flag_new_exceptions)
+ process_start_catch_block (declspecs, declarator);
+ else
+ process_start_catch_block_old (declspecs, declarator);
+}
+
+
+/* This function performs the expand_start_catch_block functionality for
+ exceptions implemented in the old style, where catch blocks were all
+ called, and had to check the runtime information themselves. */
+
+static void
+process_start_catch_block_old (declspecs, declarator)
+ tree declspecs, declarator;
+{
+ rtx false_label_rtx;
+ tree decl = NULL_TREE;
+ tree init;
+
/* Create a binding level for the eh_info and the exception object
cleanup. */
pushlevel (0);
emit_line_note (input_filename, lineno);
}
+/* This function performs the expand_start_catch_block functionality for
+ exceptions implemented in the new style. __throw determines whether
+ a handler needs to be called or not, so the handler itself has to do
+ nothing additionaal. */
+
+static void
+process_start_catch_block (declspecs, declarator)
+ tree declspecs, declarator;
+{
+ rtx false_label_rtx;
+ tree decl = NULL_TREE;
+ tree init;
+
+ /* Create a binding level for the eh_info and the exception object
+ cleanup. */
+ pushlevel (0);
+ expand_start_bindings (0);
+
+
+ if (declspecs)
+ {
+ decl = grokdeclarator (declarator, declspecs, CATCHPARM, 1, NULL_TREE);
+
+ if (decl == NULL_TREE)
+ error ("invalid catch parameter");
+ }
+
+ if (decl)
+ start_catch_handler (build_eh_type_type_ref (TREE_TYPE (decl)));
+ else
+ start_catch_handler (NULL_TREE);
+
+ emit_line_note (input_filename, lineno);
+
+ push_eh_info ();
+
+ if (decl)
+ {
+ tree exp;
+ rtx call_rtx, return_value_rtx;
+ tree init_type;
+
+ /* Make sure we mark the catch param as used, otherwise we'll get
+ a warning about an unused ((anonymous)). */
+ TREE_USED (decl) = 1;
+
+ /* Figure out the type that the initializer is. */
+ init_type = TREE_TYPE (decl);
+ if (TREE_CODE (init_type) != REFERENCE_TYPE
+ && TREE_CODE (init_type) != POINTER_TYPE)
+ init_type = build_reference_type (init_type);
+
+ exp = get_eh_value ();
+
+ /* Since pointers are passed by value, initialize a reference to
+ pointer catch parm with the address of the value slot. */
+ if (TREE_CODE (init_type) == REFERENCE_TYPE
+ && TREE_CODE (TREE_TYPE (init_type)) == POINTER_TYPE)
+ exp = build_unary_op (ADDR_EXPR, exp, 1);
+
+ exp = ocp_convert (init_type , exp, CONV_IMPLICIT|CONV_FORCE_TEMP, 0);
+
+ push_eh_cleanup ();
+
+ /* Create a binding level for the parm. */
+ pushlevel (0);
+ expand_start_bindings (0);
+
+ init = convert_from_reference (exp);
+
+ /* If the constructor for the catch parm exits via an exception, we
+ must call terminate. See eh23.C. */
+ if (TYPE_NEEDS_CONSTRUCTING (TREE_TYPE (decl)))
+ {
+ /* Generate the copy constructor call directly so we can wrap it.
+ See also expand_default_init. */
+ init = ocp_convert (TREE_TYPE (decl), init,
+ CONV_IMPLICIT|CONV_FORCE_TEMP, 0);
+ init = build (TRY_CATCH_EXPR, TREE_TYPE (init), init,
+ build_terminate_handler ());
+ }
+
+ /* Let `cp_finish_decl' know that this initializer is ok. */
+ DECL_INITIAL (decl) = init;
+ decl = pushdecl (decl);
+
+ cp_finish_decl (decl, init, NULL_TREE, 0, LOOKUP_ONLYCONVERTING);
+ }
+ else
+ {
+ push_eh_cleanup ();
+
+ /* Create a binding level for the parm. */
+ pushlevel (0);
+ expand_start_bindings (0);
+
+ /* Fall into the catch all section. */
+ }
+
+ init = build_modify_expr (get_eh_caught (), NOP_EXPR, integer_one_node);
+ expand_expr (init, const0_rtx, VOIDmode, EXPAND_NORMAL);
+
+ emit_line_note (input_filename, lineno);
+}
+
/* Call this to end a catch block. Its responsible for emitting the
/* label we emit to jump to if this catch block didn't match. */
/* This the closing } in the `if (eq) {' of the documentation. */
- emit_label (pop_label_entry (&false_label_stack));
+ if (! flag_new_exceptions)
+ emit_label (pop_label_entry (&false_label_stack));
}
/* An exception spec is implemented more or less like:
int count = 0;
expand_start_all_catch ();
- start_catch_handler (NULL);
expand_start_catch_block (NULL_TREE, NULL_TREE);
/* Build up an array of type_infos. */
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