--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/make/altsrc.make	Tue Feb 08 17:20:45 2011 -0500
@@ -0,0 +1,92 @@
+#
+# Copyright (c) 2011, Oracle and/or its affiliates. All rights reserved.
+# DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+#
+# This code is free software; you can redistribute it and/or modify it
+# under the terms of the GNU General Public License version 2 only, as
+# published by the Free Software Foundation.
+#
+# This code 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
+# version 2 for more details (a copy is included in the LICENSE file that
+# accompanied this code).
+#
+# You should have received a copy of the GNU General Public License version
+# 2 along with this work; if not, write to the Free Software Foundation,
+# Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+#
+# Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+# or visit www.oracle.com if you need additional information or have any
+# questions.
+#  
+#
+
+# This file defines variables and macros which are used in the makefiles to 
+# allow distributions to augment or replace common hotspot code with 
+# distribution-specific source files.
+
+# Requires: GAMMADIR
+# Provides:
+#   variables: HS_COMMON_SRC, HS_ALT_SRC, HS_COMMON_SRC_REL, and HS_ALT_SRC_REL
+#   functions: altsrc-equiv, if-has-altsrc, altsrc, altsrc-replace
+
+HS_COMMON_SRC_REL=src
+
+# This needs to be changed to a more generic location, but we keep it as this 
+# for now for compatibility
+HS_ALT_SRC_REL=src/closed
+
+HS_COMMON_SRC=$(GAMMADIR)/$(HS_COMMON_SRC_REL)
+HS_ALT_SRC=$(GAMMADIR)/$(HS_ALT_SRC_REL)
+
+
+## altsrc-equiv 
+# 
+# Convert a common source path to an alternative source path
+#
+# Parameter: An absolute path into the common sources
+# Result: The matching path to the alternate-source location
+#
+altsrc-equiv=$(subst $(HS_COMMON_SRC)/,$(HS_ALT_SRC)/,$(1))
+
+
+## if-has-altsrc
+#
+# Conditional macro to test for the existence of an alternate source path
+#
+# Parameter: An absolute path into the common sources
+# Parameter: Result if the alternative-source location exists
+# Parameter: Result if the alternative-source location does not exist
+# Result: expands to parameter 2 or 3 depending on existence of alternate source
+#
+if-has-altsrc=$(if $(wildcard $(call altsrc-equiv,$(1))),$(2),$(3))
+
+
+## altsrc
+#
+# Converts common source path to alternate source path if the alternate 
+# path exists, otherwise evaluates to nul (empty string)
+# 
+# Parameter: An absolute path into the common sources
+# Result: The equivalent path to the alternate-source location, if such a 
+#         location exists on the filesystem.  Otherwise it expands to empty.
+# 
+altsrc=$(call if-has-altsrc,$(1),$(call altsrc-equiv,$(1)))
+
+## commonsrc
+# 
+# Returns parameter.
+#
+commonsrc=$(1)
+
+
+## altsrc-replace
+#
+# Converts a common source path to an alternate source path if the alternate
+# source path exists.  Otherwise it evaluates to the input common source path.
+#
+# Parameter: An absolute path into the common sources
+# Result: A path to either the common or alternate sources
+#
+altsrc-replace=$(call if-has-altsrc,$(1),$(call altsrc-equiv,$(1)),$(1))