diff --git a/core/definitions.mk b/core/definitions.mk
index e8d05ac..b9845f8 100644
--- a/core/definitions.mk
+++ b/core/definitions.mk
@@ -1579,7 +1579,6 @@
 $(copy-file-to-target-strip-comments)
 endef
 
-
 ###########################################################
 ## On some platforms (MacOS), after copying a static
 ## library, ranlib must be run to update an internal
@@ -1608,6 +1607,37 @@
 
 
 ###########################################################
+## Commands to call Proguard
+###########################################################
+
+# Command to copy the file with acp, if proguard is disabled.
+define proguard-disabled-commands
+@echo Copying: $@
+$(hide) $(ACP) $< $@
+endef
+
+# Command to call Proguard
+# $(1): extra flags for instrumentation.
+define proguard-enabled-commands
+@echo Proguard: $@
+$(hide) $(PROGUARD) -injars $< -outjars $@ $(PRIVATE_PROGUARD_FLAGS) $(1)
+endef
+
+# Figure out the proguard dictionary file of the module that is instrumentationed for.
+define get-instrumentation-proguard-flags
+$(if $(PRIVATE_INSTRUMENTATION_FOR),$(if $(ALL_MODULES.$(PRIVATE_INSTRUMENTATION_FOR).PROGUARD_ENABLED),-applymapping $(call intermediates-dir-for,APPS,$(PRIVATE_INSTRUMENTATION_FOR),,COMMON)/proguard_dictionary))
+endef
+
+define transform-jar-to-proguard
+$(eval _instrumentation_proguard_flags:=$(call get-instrumentation-proguard-flags))
+$(eval _enable_proguard:=$(PRIVATE_PROGUARD_ENABLED)$(_instrumentation_proguard_flags))
+$(if $(_enable_proguard),$(call proguard-enabled-commands,$(_instrumentation_proguard_flags)),$(call proguard-disabled-commands))
+$(eval _instrumentation_proguard_flags:=)
+$(eval _enable_proguard:=)
+endef
+
+
+###########################################################
 ## Stuff source generated from one-off tools
 ###########################################################