01efddb0b8
Optimize common case of uniq-words where the word is not actually duplicated. Reduces make startup overhead. Change-Id: I1bee13bbd08a7b01248f4452283a64a724663d02
258 lines
7.4 KiB
Makefile
258 lines
7.4 KiB
Makefile
#
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# Copyright (C) 2007 The Android Open Source Project
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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#
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#
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# Clears a list of variables using ":=".
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#
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# E.g.,
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# $(call clear-var-list,A B C)
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# would be the same as:
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# A :=
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# B :=
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# C :=
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#
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# $(1): list of variable names to clear
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#
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define clear-var-list
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$(foreach v,$(1),$(eval $(v):=))
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endef
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#
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# Copies a list of variables into another list of variables.
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# The target list is the same as the source list, but has
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# a dotted prefix affixed to it.
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#
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# E.g.,
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# $(call copy-var-list, PREFIX, A B)
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# would be the same as:
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# PREFIX.A := $(A)
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# PREFIX.B := $(B)
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#
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# $(1): destination prefix
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# $(2): list of variable names to copy
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#
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define copy-var-list
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$(foreach v,$(2),$(eval $(strip $(1)).$(v):=$($(v))))
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endef
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#
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# Moves a list of variables into another list of variables.
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# The variable names differ by a prefix. After moving, the
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# source variable is cleared.
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#
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# NOTE: Spaces are not allowed around the prefixes.
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#
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# E.g.,
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# $(call move-var-list,SRC,DST,A B)
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# would be the same as:
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# DST.A := $(SRC.A)
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# SRC.A :=
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# DST.B := $(SRC.B)
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# SRC.B :=
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#
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# $(1): source prefix
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# $(2): destination prefix
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# $(3): list of variable names to move
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#
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define move-var-list
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$(foreach v,$(3), \
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$(eval $(2).$(v) := $($(1).$(v))) \
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$(eval $(1).$(v) :=) \
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)
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endef
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#
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# $(1): haystack
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# $(2): needle
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#
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# Guarantees that needle appears at most once in haystack,
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# without changing the order of other elements in haystack.
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# If needle appears multiple times, only the first occurrance
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# will survive.
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#
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# How it works:
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#
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# - Stick everything in haystack into a single word,
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# with "|||" separating the words.
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# - Replace occurrances of "|||$(needle)|||" with "||| |||",
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# breaking haystack back into multiple words, with spaces
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# where needle appeared.
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# - Add needle between the first and second words of haystack.
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# - Replace "|||" with spaces, breaking haystack back into
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# individual words.
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#
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empty :=
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space := $(empty) $(empty)
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define uniq-word
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$(strip \
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$(if $(filter-out 0 1,$(words $(filter $(2),$(1)))), \
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$(eval h := |||$(subst $(space),|||,$(strip $(1)))|||) \
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$(eval h := $(subst |||$(strip $(2))|||,|||$(space)|||,$(h))) \
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$(eval h := $(word 1,$(h)) $(2) $(wordlist 2,9999,$(h))) \
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$(subst |||,$(space),$(h)) \
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, \
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$(1) \
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))
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endef
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INHERIT_TAG := @inherit:
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#
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# Walks through the list of variables, each qualified by the prefix,
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# and finds instances of words beginning with INHERIT_TAG. Scrape
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# off INHERIT_TAG from each matching word, and return the sorted,
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# unique set of those words.
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#
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# E.g., given
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# PREFIX.A := A $(INHERIT_TAG)aaa B C
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# PREFIX.B := B $(INHERIT_TAG)aaa C $(INHERIT_TAG)bbb D E
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# Then
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# $(call get-inherited-nodes,PREFIX,A B)
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# returns
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# aaa bbb
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#
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# $(1): variable prefix
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# $(2): list of variables to check
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#
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define get-inherited-nodes
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$(sort \
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$(subst $(INHERIT_TAG),, \
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$(filter $(INHERIT_TAG)%, \
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$(foreach v,$(2),$($(1).$(v))) \
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)))
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endef
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#
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# for each variable ( (prefix + name) * vars ):
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# get list of inherited words; if not empty:
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# for each inherit:
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# replace the first occurrence with (prefix + inherited + var)
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# clear the source var so we can't inherit the value twice
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#
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# $(1): context prefix
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# $(2): name of this node
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# $(3): list of variable names
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#
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define _expand-inherited-values
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$(foreach v,$(3), \
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$(eval ### "Shorthand for the name of the target variable") \
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$(eval _eiv_tv := $(1).$(2).$(v)) \
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$(eval ### "Get the list of nodes that this variable inherits") \
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$(eval _eiv_i := \
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$(sort \
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$(patsubst $(INHERIT_TAG)%,%, \
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$(filter $(INHERIT_TAG)%, $($(_eiv_tv)) \
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)))) \
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$(foreach i,$(_eiv_i), \
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$(eval ### "Make sure that this inherit appears only once") \
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$(eval $(_eiv_tv) := \
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$(call uniq-word,$($(_eiv_tv)),$(INHERIT_TAG)$(i))) \
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$(eval ### "Expand the inherit tag") \
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$(eval $(_eiv_tv) := \
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$(strip \
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$(patsubst $(INHERIT_TAG)$(i),$($(1).$(i).$(v)), \
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$($(_eiv_tv))))) \
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$(eval ### "Clear the child so DAGs don't create duplicate entries" ) \
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$(eval $(1).$(i).$(v) :=) \
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$(eval ### "If we just inherited ourselves, it's a cycle.") \
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$(if $(filter $(INHERIT_TAG)$(2),$($(_eiv_tv))), \
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$(warning Cycle detected between "$(2)" and "$(i)" for context "$(1)") \
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$(error import of "$(2)" failed) \
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) \
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) \
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) \
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$(eval _eiv_tv :=) \
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$(eval _eiv_i :=)
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endef
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#
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# $(1): context prefix
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# $(2): makefile representing this node
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# $(3): list of node variable names
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#
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# _include_stack contains the list of included files, with the most recent files first.
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define _import-node
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$(eval _include_stack := $(2) $$(_include_stack))
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$(call clear-var-list, $(3))
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$(eval LOCAL_PATH := $(patsubst %/,%,$(dir $(2))))
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$(eval MAKEFILE_LIST :=)
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$(eval include $(2))
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$(eval _included := $(filter-out $(2),$(MAKEFILE_LIST)))
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$(eval MAKEFILE_LIST :=)
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$(eval LOCAL_PATH :=)
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$(call copy-var-list, $(1).$(2), $(3))
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$(call clear-var-list, $(3))
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$(eval $(1).$(2).inherited := \
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$(call get-inherited-nodes,$(1).$(2),$(3)))
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$(call _import-nodes-inner,$(1),$($(1).$(2).inherited),$(3))
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$(call _expand-inherited-values,$(1),$(2),$(3))
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$(eval $(1).$(2).inherited :=)
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$(eval _include_stack := $(wordlist 2,9999,$$(_include_stack)))
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endef
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#
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# This will generate a warning for _included above
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# $(if $(_included), \
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# $(eval $(warning product spec file: $(2)))\
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# $(foreach _inc,$(_included),$(eval $(warning $(space)$(space)$(space)includes: $(_inc)))),)
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#
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#
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# $(1): context prefix
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# $(2): list of makefiles representing nodes to import
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# $(3): list of node variable names
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#
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#TODO: Make the "does not exist" message more helpful;
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# should print out the name of the file trying to include it.
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define _import-nodes-inner
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$(foreach _in,$(2), \
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$(if $(wildcard $(_in)), \
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$(if $($(1).$(_in).seen), \
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$(eval ### "skipping already-imported $(_in)") \
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, \
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$(eval $(1).$(_in).seen := true) \
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$(call _import-node,$(1),$(strip $(_in)),$(3)) \
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) \
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, \
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$(error $(1): "$(_in)" does not exist) \
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) \
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)
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endef
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#
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# $(1): output list variable name, like "PRODUCTS" or "DEVICES"
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# $(2): list of makefiles representing nodes to import
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# $(3): list of node variable names
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#
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define import-nodes
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$(if \
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$(foreach _in,$(2), \
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$(eval _node_import_context := _nic.$(1).[[$(_in)]]) \
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$(if $(_include_stack),$(eval $(error ASSERTION FAILED: _include_stack \
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should be empty here: $(_include_stack))),) \
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$(eval _include_stack := ) \
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$(call _import-nodes-inner,$(_node_import_context),$(_in),$(3)) \
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$(call move-var-list,$(_node_import_context).$(_in),$(1).$(_in),$(3)) \
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$(eval _node_import_context :=) \
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$(eval $(1) := $($(1)) $(_in)) \
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$(if $(_include_stack),$(eval $(error ASSERTION FAILED: _include_stack \
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should be empty here: $(_include_stack))),) \
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) \
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,)
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endef
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