2001-02-07  Andrew Haley  <aph@redhat.com>

	* gcj.texi (Configure-time Options): Add -fcheck-references.
	* expr.c (build_java_indirect_ref): New function.
	(java_check_reference): New function.
	(build_java_array_length_access): Use build_java_indirect_ref to
	check for null references.
	(build_java_arrayaccess): Likewise.
	(build_get_class): Likewise.
	(build_field_ref): Likewise.
	(invoke_build_dtable): Likewise.
	(build_invokeinterface): Likewise.
	* lang.c (lang_f_options): Add flag_check_references.
	* jvspec.c (jvgenmain_spec): Add flag_check_references.
	* java-tree.h (flag_check_references): New variable.
	* lang.c (flag_check_references): Likewise.
	* parse.y (patch_invoke): Use java_check_reference.
	(patch_assignment): Allow for extra nesting in
	_Jv_CheckArrayStore.

From-SVN: r40782