# Copyright (C) 2009 The Android Open Source Project
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#      http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
# Module database functions.
#

# The list of default C++ extensions supported by GCC.
default-c++-extensions := .cc .cp .cxx .cpp .CPP .c++ .C

# =============================================================================
#
# Modules database
#
# The following declarations are used to manage the list of modules
# defined in application's Android.mk files.
#
# Technical note:
#    We use __build_modules to hold the list of all modules corresponding
#    to a given application.
#
#    For each module 'foo', __build_modules.foo.<field> is used
#    to store module-specific information.
#
#        type         -> type of module (e.g. 'static', 'shared', ...)
#        depends      -> list of other modules this module depends on
#
#    Also, LOCAL_XXXX values defined for a module are recorded in XXXX, e.g.:
#
#        PATH   -> recorded LOCAL_PATH for the module
#        CFLAGS -> recorded LOCAL_CFLAGS for the module
#        ...
#
#    Some of these are created by build scripts like BUILD_STATIC_LIBRARY:
#
#        MAKEFILE -> The Android.mk where the module is defined.
#        LDFLAGS  -> Final linker flags
#        OBJECTS  -> List of module objects
#        BUILT_MODULE -> location of module built file (e.g. obj/<app>/<abi>/libfoo.so)
#
#    Note that some modules are never installed (e.g. static libraries).
#
# =============================================================================

# The list of LOCAL_XXXX variables that are recorded for each module definition
# These are documented by docs/ANDROID-MK.TXT. Exception is LOCAL_MODULE
#
modules-LOCALS := \
    ALLOW_UNDEFINED_SYMBOLS \
    ASMFLAGS \
    BUILT_MODULE_NOT_COPIED \
    CFLAGS \
    CONLYFLAGS \
    CPPFLAGS \
    CPP_EXTENSION \
    CPP_FEATURES \
    CXXFLAGS \
    C_INCLUDES \
    DISABLE_FORMAT_STRING_CHECKS \
    DISABLE_NO_EXECUTE \
    DISABLE_RELRO \
    EXPORT_ASMFLAGS \
    EXPORT_CFLAGS \
    EXPORT_CONLYFLAGS \
    EXPORT_CPPFLAGS \
    EXPORT_C_INCLUDES \
    EXPORT_LDFLAGS \
    EXPORT_LDLIBS \
    FILTER_ASM \
    LDFLAGS \
    LDLIBS \
    MODULE \
    MODULE_FILENAME \
    PATH \
    PCH \
    SHARED_LIBRARIES \
    SHORT_COMMANDS \
    SRC_FILES \
    STATIC_LIBRARIES \
    THIN_ARCHIVE \
    WHOLE_STATIC_LIBRARIES \

# The following are generated by the build scripts themselves

# LOCAL_MAKEFILE will contain the path to the Android.mk defining the module
modules-LOCALS += MAKEFILE

# LOCAL_LDFLAGS will contain the set of final linker flags for the module
modules-LOCALS += LDFLAGS

# LOCAL_OBJECTS will contain the list of object files generated from the
# module's sources, if any.
modules-LOCALS += OBJECTS

# LOCAL_BUILT_MODULE will contain the location of the symbolic version of
# the generated module (i.e. the one containing all symbols used during
# native debugging). It is generally under $PROJECT/obj/local/
modules-LOCALS += BUILT_MODULE

# LOCAL_OBJS_DIR will contain the location where the object files for
# this module will be stored. Usually $PROJECT/obj/local/<module>/obj
modules-LOCALS += OBJS_DIR

# LOCAL_INSTALLED will contain the location of the installed version
# of the module. Usually $PROJECT/libs/<abi>/<prefix><module><suffix>
# where <prefix> and <suffix> depend on the module class.
modules-LOCALS += INSTALLED

# LOCAL_MODULE_CLASS will contain the type of the module
# (e.g. STATIC_LIBRARY, SHARED_LIBRARY, etc...)
modules-LOCALS += MODULE_CLASS

# the list of managed fields per module
modules-fields = depends \
                 $(modules-LOCALS)

# -----------------------------------------------------------------------------
# Function : modules-clear
# Arguments: None
# Returns  : None
# Usage    : $(call modules-clear)
# Rationale: clears the list of defined modules known by the build system
# -----------------------------------------------------------------------------
modules-clear = \
    $(foreach __mod,$(__build_modules),\
        $(foreach __field,$(modules-fields),\
            $(eval __build_modules.$(__mod).$(__field) := $(empty))\
        )\
    )\
    $(eval __build_modules := $(empty_set)) \
    $(eval __build_top_modules := $(empty)) \
    $(eval __build_import_list := $(empty)) \
    $(eval __build_import_depth := $(empty))

# -----------------------------------------------------------------------------
# Function : modules-clear-local-vars
# Arguments: None
# Returns  : None
# Usage    : $(call modules-clear-localvars)
# Rationale: clears all module-specific LOCAL_XXX variables, with the exception
#            of LOCAL_PATH. Typically used to implement $(CLEAR_VARS)
# -----------------------------------------------------------------------------
modules-clear-local-vars = \
    $(call clear-vars, $(filter-out LOCAL_PATH,$(modules-LOCALS:%=LOCAL_%)))\
	$(eval LOCAL_PATH := $$(strip $$(LOCAL_PATH)))

# -----------------------------------------------------------------------------
# Function : modules-get-list
# Arguments: None
# Returns  : The list of all recorded modules
# Usage    : $(call modules-get-list)
# -----------------------------------------------------------------------------
modules-get-list = $(__build_modules)

# -----------------------------------------------------------------------------
# Function : modules-get-top-list
# Arguments: None
# Returns  : The list of all recorded non-imported modules
# Usage    : $(call modules-get-top-list)
# -----------------------------------------------------------------------------
modules-get-top-list = $(__build_top_modules)

# -----------------------------------------------------------------------------
# Function : module-add
# Arguments: 1: module name
# Returns  : None
# Usage    : $(call module-add,<modulename>)
# Rationale: add a new module. If it is already defined, print an error message
#            and abort. This will record all LOCAL_XXX variables for the module.
# -----------------------------------------------------------------------------
module-add = \
  $(call assert-defined,LOCAL_MAKEFILE LOCAL_BUILT_MODULE LOCAL_OBJS_DIR LOCAL_MODULE_CLASS)\
  $(if $(call set_is_member,$(__build_modules),$1),\
    $(call -build-info,Trying to define local module '$1' in $(LOCAL_MAKEFILE).)\
    $(call -build-info,But this module was already defined by $(__build_modules.$1.MAKEFILE).)\
    $(call -build-error,Aborting.)\
  )\
  $(eval __build_modules := $(call set_insert,$(__build_modules),$1))\
  $(if $(strip $(__build_import_depth)),,\
    $(eval __build_top_modules := $(call set_insert,$(__build_top_modules),$1))\
  )\
  $(if $(call module-class-is-installable,$(LOCAL_MODULE_CLASS)),\
    $(eval LOCAL_INSTALLED := $(BUILD_INSTALL_DIR)/$(notdir $(LOCAL_BUILT_MODULE))),\
    $(eval LOCAL_INSTALLED := $(LOCAL_BUILT_MODULE))\
  )\
  $(foreach __field,STATIC_LIBRARIES WHOLE_STATIC_LIBRARIES SHARED_LIBRARIES,\
    $(eval LOCAL_$(__field) := $(call strip-lib-prefix,$(LOCAL_$(__field)))))\
  $(foreach __local,$(modules-LOCALS),\
    $(eval __build_modules.$1.$(__local) := $(LOCAL_$(__local)))\
  )\
  $(call module-handle-c++-features,$1)


# Retrieve the class of module $1
module-get-class = $(__build_modules.$1.MODULE_CLASS)

# Retrieve built location of module $1
module-get-built = $(__build_modules.$1.BUILT_MODULE)

# Returns $(true) is module $1 is installable
# An installable module is one that will be copied to $PROJECT/libs/<abi>/
# (e.g. shared libraries).
#
module-is-installable = $(call module-class-is-installable,$(call module-get-class,$1))

# -----------------------------------------------------------------------------
# Function : module-get-export
# Arguments: 1: module name
#            2: export variable name without LOCAL_EXPORT_ prefix (e.g. 'CFLAGS')
# Returns  : Exported value
# Usage    : $(call module-get-export,<modulename>,<varname>)
# Rationale: Return the recorded value of LOCAL_EXPORT_$2, if any, for module $1
# -----------------------------------------------------------------------------
module-get-export = $(__build_modules.$1.EXPORT_$2)

# -----------------------------------------------------------------------------
# Function : module-get-listed-export
# Arguments: 1: list of module names
#            2: export variable name without LOCAL_EXPORT_ prefix (e.g. 'CFLAGS')
# Returns  : Exported values
# Usage    : $(call module-get-listed-export,<module-list>,<varname>)
# Rationale: Return the recorded value of LOCAL_EXPORT_$2, if any, for modules
#            listed in $1.
# -----------------------------------------------------------------------------
module-get-listed-export = $(strip \
    $(foreach __listed_module,$1,\
        $(call module-get-export,$(__listed_module),$2)\
    ))

# -----------------------------------------------------------------------------
# Function : modules-restore-locals
# Arguments: 1: module name
# Returns  : None
# Usage    : $(call module-restore-locals,<modulename>)
# Rationale: Restore the recorded LOCAL_XXX definitions for a given module.
# -----------------------------------------------------------------------------
module-restore-locals = \
    $(foreach __local,$(modules-LOCALS),\
        $(eval LOCAL_$(__local) := $(__build_modules.$1.$(__local)))\
    )

# Dump all module information. Only use this for debugging
modules-dump-database = \
    $(info Modules [$(TARGET_ARCH_ABI)]: $(__build_modules)) \
    $(foreach __mod,$(__build_modules),\
        $(info $(space4)$(__mod):)\
        $(foreach __field,$(modules-fields),\
            $(eval __fieldval := $(strip $(__build_modules.$(__mod).$(__field))))\
            $(if $(__fieldval),\
                $(if $(filter 1,$(words $(__fieldval))),\
                    $(info $(space4)$(space4)$(__field): $(__fieldval)),\
                    $(info $(space4)$(space4)$(__field): )\
                    $(foreach __fielditem,$(__fieldval),\
                        $(info $(space4)$(space4)$(space4)$(__fielditem))\
                    )\
                )\
            )\
        )\
    )\
    $(info Top modules: $(__build_top_modules))\
    $(info --- end of modules list)


# -----------------------------------------------------------------------------
# Function : module-add-static-depends
# Arguments: 1: module name
#            2: list/set of static library modules this module depends on.
# Returns  : None
# Usage    : $(call module-add-static-depends,<modulename>,<list of module names>)
# Rationale: Record that a module depends on a set of static libraries.
#            Use module-get-static-dependencies to retrieve final list.
# -----------------------------------------------------------------------------
module-add-static-depends = \
    $(call module-add-depends-any,$1,$2,depends) \

# -----------------------------------------------------------------------------
# Function : module-add-shared-depends
# Arguments: 1: module name
#            2: list/set of shared library modules this module depends on.
# Returns  : None
# Usage    : $(call module-add-shared-depends,<modulename>,<list of module names>)
# Rationale: Record that a module depends on a set of shared libraries.
#            Use modulge-get-shared-dependencies to retrieve final list.
# -----------------------------------------------------------------------------
module-add-shared-depends = \
    $(call module-add-depends-any,$1,$2,depends) \

# Used internally by module-add-static-depends and module-add-shared-depends
# NOTE: this function must not modify the existing dependency order when new depends are added.
#
module-add-depends-any = \
    $(eval __build_modules.$1.$3 += $(filter-out $(__build_modules.$1.$3),$2))


# -----------------------------------------------------------------------------
# Returns non-empty if a module is a static library
# Arguments: 1: module name
# Returns     : non-empty iff the module is a static library.
# Usage       : $(if $(call module-is-static-library,<name>),...)
# -----------------------------------------------------------------------------
module-is-static-library = $(strip \
  $(filter STATIC_LIBRARY PREBUILT_STATIC_LIBRARY,\
    $(call module-get-class,$1)))

# -----------------------------------------------------------------------------
# Returns non-empty if a module is a shared library
# Arguments: 1: module name
# Returns     : non-empty iff the module is a shared library.
# Usage       : $(if $(call module-is-shared-library,<name>),...)
# -----------------------------------------------------------------------------
module-is-shared-library = $(strip \
  $(filter SHARED_LIBRARY PREBUILT_SHARED_LIBRARY,\
    $(call module-get-class,$1)))

# -----------------------------------------------------------------------------
# Filter a list of module names to retain only the static libraries.
# Arguments: 1: module name list
# Returns     : input list modules which are static libraries.
# -----------------------------------------------------------------------------
module-filter-static-libraries = $(call filter-by,$1,module-is-static-library)

# -----------------------------------------------------------------------------
# Filter a list of module names to retain only the shared libraries.
# Arguments: 1: module name list
# Returns     : input list modules which are shared libraries.
# -----------------------------------------------------------------------------
module-filter-shared-libraries = $(call filter-by,$1,module-is-shared-library)

# -----------------------------------------------------------------------------
# Return the LOCAL_STATIC_LIBRARIES for a given module.
# Arguments: 1: module name
# Returns     : List of static library modules.
# -----------------------------------------------------------------------------
module-get-static-libs = $(__build_modules.$1.STATIC_LIBRARIES)

# -----------------------------------------------------------------------------
# Return the LOCAL_WHOLE_STATIC_LIBRARIES for a given module.
# Arguments: 1: module name
# Returns     : List of whole static library modules.
# -----------------------------------------------------------------------------
module-get-whole-static-libs = $(__build_modules.$1.WHOLE_STATIC_LIBRARIES)

# -----------------------------------------------------------------------------
# Return all static libraries for a given module.
# Arguments: 1: module name
# Returns     : List of static library modules (whole or not).
# -----------------------------------------------------------------------------
module-get-all-static-libs = $(strip \
  $(__build_modules.$1.STATIC_LIBRARIES) \
  $(__build_modules.$1.WHOLE_STATIC_LIBRARIES))

# -----------------------------------------------------------------------------
# Return the list of LOCAL_SHARED_LIBRARIES for a given module.
# Arguments: 1: module name
# Returns     : List of shared library modules.
# -----------------------------------------------------------------------------
module-get-shared-libs = $(__build_modules.$1.SHARED_LIBRARIES)

# -----------------------------------------------------------------------------
# Return the list of all libraries a modules depends directly on.
# This is the concatenation of its LOCAL_STATIC_LIBRARIES,
# LOCAL_WHOLE_STATIC_LIBRARIES, and LOCAL_SHARED_LIBRARIES variables.
# Arguments: 1: module name
# Returns     : List of library modules (static or shared).
# -----------------------------------------------------------------------------
module-get-direct-libs = $(strip \
  $(__build_modules.$1.STATIC_LIBRARIES) \
  $(__build_modules.$1.WHOLE_STATIC_LIBRARIES) \
  $(__build_modules.$1.SHARED_LIBRARIES))


# -----------------------------------------------------------------------------
# Computes the full closure of a module and its dependencies. Order is
# defined by a breadth-first walk of the graph.
# $1 will be the first item in the result.
#
# Arguments: 1: module name
# Returns     : List of all modules $1 depends on.
#
# Note: Do not use this to determine build dependencies. The returned list
#       is much too large for this. For example consider the following
#       dependency graph:
#
#   main.exe -> libA.a -> libfoo.so -> libB.a
#
#       This function will return all four modules in the result, while
#       at link time building main.exe only requires the first three.
#
# -----------------------------------------------------------------------------
module-get-all-dependencies = $(call -build-mod-get-closure,$1,module-get-depends)

# -----------------------------------------------------------------------------
# Compute the list of all static and shared libraries required to link a
# given module.
#
# Note that the result is topologically ordered, i.e. if library A depends
# on library B, then A will always appear after B in the result.
#
# Arguments: 1: module name
# Returns     : List of all library $1 depends at link time.
#
# Note: This doesn't differentiate between regular and whole static
#       libraries. Use module-extract-whole-static-libs to filter the
#       result returned by this function.
# -----------------------------------------------------------------------------
module-get-link-libs = $(strip \
  $(eval _build_mod_link_module := $1) \
  $(call -build-mod-get-topological-depends,$1,-build-mod-link-deps))

# Special dependency function used by module-get-link-libs.
# The rules to follow are the following:
#  - if $1 is the link module, or if it is a static library, then all
#    direct dependencies.
#  - otherwise, the module is a shared library, don't add build deps.
-build-mod-link-deps = \
  $(if $(call seq,$1,$(_build_mod_link_module))$(call module-is-static-library,$1),\
    $(call module-get-direct-libs,$1))

# -----------------------------------------------------------------------------
# This function is used to extract the list of static libraries that need
# to be linked as whole, i.e. placed in a special section on the final
# link command.
# Arguments: $1: module name.
#            $2: list of all static link-time libraries (regular or whole).
# Returns  : list of static libraries from '$2' that need to be linked
#            as whole.
# -----------------------------------------------------------------------------
module-extract-whole-static-libs = $(strip \
  $(eval _build_mod_whole_all := $(call map,module-get-whole-static-libs,$1 $2))\
  $(eval _build_mod_whole_result := $(filter $(_build_mod_whole_all),$2))\
  $(_build_mod_whole_result))

# Used to recompute all dependencies once all module information has been recorded.
#
modules-compute-dependencies = \
    $(foreach __module,$(__build_modules),\
        $(call module-compute-depends,$(__module))\
    )

module-compute-depends = \
    $(call module-add-static-depends,$1,$(__build_modules.$1.STATIC_LIBRARIES))\
    $(call module-add-static-depends,$1,$(__build_modules.$1.WHOLE_STATIC_LIBRARIES))\
    $(call module-add-shared-depends,$1,$(__build_modules.$1.SHARED_LIBRARIES))\

module-get-installed = $(__build_modules.$1.INSTALLED)

module-get-depends = $(__build_modules.$1.depends)

# -----------------------------------------------------------------------------
# Function : modules-get-all-installable
# Arguments: 1: list of module names
# Returns  : List of all the installable modules $1 depends on transitively.
# Usage    : $(call modules-all-get-installable,<list of module names>)
# Rationale: This computes the closure of all installable module dependencies starting from $1
# -----------------------------------------------------------------------------
# For now, only the closure of LOCAL_SHARED_LIBRARIES is enough
modules-get-all-installable = $(strip \
    $(foreach __alldep,$(call module-get-all-dependencies,$1),\
        $(if $(call module-is-installable,$(__alldep)),$(__alldep))\
    ))

# Return the C++ extension(s) of a given module
# $1: module name
module-get-c++-extensions = $(strip \
    $(if $(__build_modules.$1.CPP_EXTENSION),\
        $(__build_modules.$1.CPP_EXTENSION),\
        $(default-c++-extensions)\
    ))

# Return the list of C++ sources of a given module
#
module-get-c++-sources = \
    $(eval __files := $(__build_modules.$1.SRC_FILES:%.neon=%)) \
    $(eval __files := $(__files:%.arm=%)) \
    $(eval __extensions := $(call module-get-c++-extensions,$1))\
    $(filter $(foreach __extension,$(__extensions),%$(__extension)),$(__files))

# Returns true if a module has C++ sources
#
module-has-c++-sources = $(strip $(call module-get-c++-sources,$1))


# Add C++ dependencies to any module that has C++ sources.
# $1: list of C++ runtime static libraries (if any)
# $2: list of C++ runtime shared libraries (if any)
#
modules-add-c++-dependencies = \
    $(foreach __module,$(__build_modules),\
        $(if $(call module-has-c++-sources,$(__module)),\
            $(call -build-log,Module '$(__module)' has C++ sources)\
            $(call module-add-c++-deps,$(__module),$1,$2),\
        )\
    )


# Return the compiler flags used to compile a C++ module
# Order matters and should match the one used by the build command
module-get-c++-flags = $(strip \
    $(__build_modules.$1.CFLAGS) \
    $(__build_modules.$1.CPPFLAGS) \
    $(__build_modules.$1.CXXFLAGS))

# This function is used to remove certain flags from a module compiler flags
# $1: Module name
# $2: List of flags to remove
#
module-filter-out-compiler-flags = \
    $(eval __build_modules.$1.CFLAGS     := $(filter-out $2,$(__build_modules.$1.CFLAGS)))\
    $(eval __build_modules.$1.CONLYFLAGS := $(filter-out $2,$(__build_modules.$1.CONLYFLAGS)))\
    $(eval __build_modules.$1.CPPFLAGS   := $(filter-out $2,$(__build_modules.$1.CPPFLAGS)))\
    $(eval __build_modules.$1.CXXFLAGS   := $(filter-out $2,$(__build_modules.$1.CXXFLAGS)))\
    $(eval __build_modules.$1.ASMFLAGS   := $(filter-out $2,$(__build_modules.$1.ASMFLAGS)))

# Return true if a module's compiler flags enable rtti
# We just look at -frtti and -fno-rtti on the command-line
# and keep the last one of these flags.
module-flags-have-rtti = $(strip \
        $(filter -frtti,\
            $(lastword $(filter -frtti -fno-rtti,$(call module-get-c++-flags,$1)))\
        )\
    )

# Same with C++ exception support (i.e. -fexceptions and -fno-exceptions)
#
module-flags-have-exceptions = $(strip \
        $(filter -fexceptions,\
            $(lastword $(filter -fexceptions -fno-execeptions,$(call module-get-c++-flags,$1)))\
        )\
    )

# Handle the definition of LOCAL_CPP_FEATURES, i.e.:
#
#  - If it is defined, check that it only contains valid values
#  - If it is undefined, try to compute its value automatically by
#    looking at the C++ compiler flags used to build the module
#
# After this, we remove all features flags from the module's command-line
# And add only the correct ones back in LOCAL_CPP_FLAGS
#
module-handle-c++-features = \
    $(if $(strip $(__build_modules.$1.CPP_FEATURES)),\
        $(eval __cxxbad := $(filter-out rtti exceptions,$(__build_modules.$1.CPP_FEATURES)))\
        $(if $(__cxxbad),\
            $(call -build-info,WARNING: Ignoring invalid values in LOCAL_CPP_FEATURES definition in $(__build_modules.$1.MAKEFILE): $(__cxxbad))\
            $(eval __build_modules.$1.CPP_FEATURES := $(strip $(filter-out $(__cxxbad),$(__build_modules.$1.CPP_FEATURES))))\
        )\
    ,\
        $(eval __build_modules.$1.CPP_FEATURES := $(strip \
            $(if $(call module-flags-have-rtti,$1),rtti) \
            $(if $(call module-flags-have-exceptions,$1),exceptions) \
        )) \
    )\
    $(call module-filter-out-compiler-flags,$1,-frtti -fno-rtti -fexceptions -fno-exceptions)\

# Returns true if a module or its dependencies have specific C++ features
# (i.e. RTTI or Exceptions)
#
# $1: module name
# $2: list of features (e.g. 'rtti' or 'exceptions')
#
module-has-c++-features = $(strip \
    $(eval __cxxdeps  := $(call module-get-all-dependencies,$1))\
    $(eval __cxxflags := $(foreach __cxxdep,$(__cxxdeps),$(__build_modules.$(__cxxdep).CPP_FEATURES)))\
    $(if $(filter $2,$(__cxxflags)),true,)\
    )

# Add standard C++ dependencies to a given module
#
# $1: module name
# $2: list of C++ runtime static libraries (if any)
# $3: list of C++ runtime shared libraries (if any)
#
module-add-c++-deps = \
    $(if $(call strip,$2),$(call -build-log,Add dependency '$(call strip,$2)' to module '$1'))\
    $(eval __build_modules.$1.STATIC_LIBRARIES += $(2))\
    $(if $(call strip,$3),$(call -build-log,Add dependency '$(call strip,$3)' to module '$1'))\
    $(eval __build_modules.$1.SHARED_LIBRARIES += $(3))

# -----------------------------------------------------------------------------
# Function : check-user-define
# Arguments: 1: name of variable that must be defined by the user
#            2: name of Makefile where the variable should be defined
#            3: name/description of the Makefile where the check is done, which
#               must be included by $2
# Returns  : None
# -----------------------------------------------------------------------------
check-user-define = $(if $(strip $($1)),,\
  $(call -build-error,Missing $1 before including $3 in $2))

# -----------------------------------------------------------------------------
# This is used to check that LOCAL_MODULE is properly defined by an Android.mk
# file before including one of the $(BUILD_SHARED_LIBRARY), etc... files.
#
# Function : check-user-LOCAL_MODULE
# Arguments: 1: name/description of the included build Makefile where the
#               check is done
# Returns  : None
# Usage    : $(call check-user-LOCAL_MODULE, BUILD_SHARED_LIBRARY)
# -----------------------------------------------------------------------------
check-defined-LOCAL_MODULE = \
  $(call check-user-define,LOCAL_MODULE,$(LOCAL_MAKEFILE),$(1)) \
  $(if $(call seq,$(words $(LOCAL_MODULE)),1),,\
    $(call -build-info,LOCAL_MODULE definition in $(LOCAL_MAKEFILE) must not contain space)\
    $(call -build-error,Please correct error. Aborting)\
  )

# -----------------------------------------------------------------------------
# This is used to check that LOCAL_MODULE_FILENAME, if defined, is correct.
#
# Function : check-user-LOCAL_MODULE_FILENAME
# Returns  : None
# Usage    : $(call check-user-LOCAL_MODULE_FILENAME)
# -----------------------------------------------------------------------------
check-LOCAL_MODULE_FILENAME = \
  $(if $(strip $(LOCAL_MODULE_FILENAME)),\
    $(if $(call seq,$(words $(LOCAL_MODULE_FILENAME)),1),,\
        $(call -build-info,$(LOCAL_MAKEFILE):$(LOCAL_MODULE): LOCAL_MODULE_FILENAME must not contain spaces)\
        $(call -build-error,Plase correct error. Aborting)\
    )\
    $(if $(filter %$(TARGET_LIB_EXTENSION) %$(TARGET_SONAME_EXTENSION),$(LOCAL_MODULE_FILENAME)),\
        $(call -build-info,$(LOCAL_MAKEFILE):$(LOCAL_MODULE): LOCAL_MODULE_FILENAME should not include file extensions)\
    )\
  )

# -----------------------------------------------------------------------------
# Function  : handle-module-filename
# Arguments : 1: default file prefix
#             2: file suffix
# Returns   : None
# Usage     : $(call handle-module-filename,<prefix>,<suffix>)
# Rationale : To be used to check and or set the module's filename through
#             the LOCAL_MODULE_FILENAME variable.
# -----------------------------------------------------------------------------
handle-module-filename = $(eval $(call ev-handle-module-filename,$1,$2))

#
# Check that LOCAL_MODULE_FILENAME is properly defined
# - with one single item
# - without a library file extension
# - with no directory separators
#
define ev-check-module-filename
ifneq (1,$$(words $$(LOCAL_MODULE_FILENAME)))
    $$(call -build-info,$$(LOCAL_MAKEFILE):$$(LOCAL_MODULE): LOCAL_MODULE_FILENAME must not contain any space)
    $$(call -build-error,Aborting)
endif
ifneq (,$$(filter %$$(TARGET_LIB_EXTENSION) %$$(TARGET_SONAME_EXTENSION),$$(LOCAL_MODULE_FILENAME)))
    $$(call -build-info,$$(LOCAL_MAKEFILE):$$(LOCAL_MODULE): LOCAL_MODULE_FILENAME must not contain a file extension)
    $$(call -build-error,Aborting)
endif
ifneq (1,$$(words $$(subst /, ,$$(LOCAL_MODULE_FILENAME))))
    $$(call -build-info,$$(LOCAL_MAKEFILE):$$(LOCAL_MODULE): LOCAL_MODULE_FILENAME must not contain directory separators)
    $$(call -build-error,Aborting)
endif
endef

#
# Check the definition of LOCAL_MODULE_FILENAME. If none exists,
# infer it from the LOCAL_MODULE name.
#
# $1: default file prefix
# $2: default file suffix
#
define ev-handle-module-filename
LOCAL_MODULE_FILENAME := $$(strip $$(LOCAL_MODULE_FILENAME))
ifndef LOCAL_MODULE_FILENAME
    LOCAL_MODULE_FILENAME := $1$$(LOCAL_MODULE)
endif
$$(eval $$(call ev-check-module-filename))
LOCAL_MODULE_FILENAME := $$(LOCAL_MODULE_FILENAME)$2
endef

handle-prebuilt-module-filename = $(eval $(call ev-handle-prebuilt-module-filename,$1))

#
# Check the definition of LOCAL_MODULE_FILENAME for a _prebuilt_ module.
# If none exists, infer it from $(LOCAL_SRC_FILES)
#
# $1: default file suffix
#
define ev-handle-prebuilt-module-filename
LOCAL_MODULE_FILENAME := $$(strip $$(LOCAL_MODULE_FILENAME))
ifndef LOCAL_MODULE_FILENAME
    LOCAL_MODULE_FILENAME := $$(notdir $(LOCAL_SRC_FILES))
    LOCAL_MODULE_FILENAME := $$(LOCAL_MODULE_FILENAME:%$$(TARGET_LIB_EXTENSION)=%)
    LOCAL_MODULE_FILENAME := $$(LOCAL_MODULE_FILENAME:%$$(TARGET_SONAME_EXTENSION)=%)
endif
LOCAL_MODULE_FILENAME := $$(LOCAL_MODULE_FILENAME)$1
$$(eval $$(call ev-check-module-filename))
endef


# -----------------------------------------------------------------------------
# Function  : handle-module-built
# Returns   : None
# Usage     : $(call handle-module-built)
# Rationale : To be used to automatically compute the location of the generated
#             binary file, and the directory where to place its object files.
# -----------------------------------------------------------------------------
handle-module-built = \
    $(eval LOCAL_BUILT_MODULE := $(TARGET_OUT)/$(LOCAL_MODULE_FILENAME))\
    $(eval LOCAL_OBJS_DIR     := $(TARGET_OBJS)/$(LOCAL_MODULE))

# -----------------------------------------------------------------------------
# Compute the real path of a prebuilt file.
#
# Function : local-prebuilt-path
# Arguments: 1: prebuilt path (as listed in $(LOCAL_SRC_FILES))
# Returns  : full path. If $1 begins with a /, the path is considered
#            absolute and returned as-is. Otherwise, $(LOCAL_PATH)/$1 is
#            returned instead.
# Usage    : $(call local-prebuilt-path,$(LOCAL_SRC_FILES))
# -----------------------------------------------------------------------------
local-prebuilt-path = $(call local-source-file-path,$1)

# -----------------------------------------------------------------------------
# This is used to strip any lib prefix from LOCAL_MODULE, then check that
# the corresponding module name is not already defined.
#
# Function : check-user-LOCAL_MODULE
# Arguments: 1: path of Android.mk where this LOCAL_MODULE is defined
# Returns  : None
# Usage    : $(call check-LOCAL_MODULE,$(LOCAL_MAKEFILE))
# -----------------------------------------------------------------------------
check-LOCAL_MODULE = \
  $(eval LOCAL_MODULE := $$(call strip-lib-prefix,$$(LOCAL_MODULE)))

#
#  Module imports
#

# List of module import directories.
__build_import_dirs :=

# Add an optional single directory to the list of import paths
#
import-add-path-optional = \
  $(if $(strip $(wildcard $1)),\
    $(call -build-log,Adding import directory: $1)\
    $(eval __build_import_dirs += $1)\
  )\

# Add a directory to the list of import paths
# This will warn if the directory does not exist
#
import-add-path = \
  $(if $(strip $(wildcard $1)),\
    $(call -build-log,Adding import directory: $1)\
    $(eval __build_import_dirs += $1)\
  ,\
    $(call -build-info,WARNING: Ignoring unknown import directory: $1)\
  )\

import-find-module = $(strip \
      $(eval __imported_module :=)\
      $(foreach __import_dir,$(__build_import_dirs),\
        $(if $(__imported_module),,\
          $(call -build-log,  Probing $(__import_dir)/$1/Android.mk)\
          $(if $(strip $(wildcard $(__import_dir)/$1/Android.mk)),\
            $(eval __imported_module := $(__import_dir)/$1)\
          )\
        )\
      )\
      $(__imported_module)\
    )

BUILD_MODULE_PATH_VARNAME := $(strip $(BUILD_MODULE_PATH_VARNAME))
ifndef BUILD_MODULE_PATH_VARNAME
    BUILD_MODULE_PATH_VARNAME := BUILD_MODULE_PATH
endif

BUILD_MODULE_PATH := $(strip $($(BUILD_MODULE_PATH_VARNAME)))
ifdef BUILD_MODULE_PATH
  ifneq ($(words $(BUILD_MODULE_PATH)),1)
    $(call -build-info,ERROR: You $(BUILD_MODULE_PATH_VARNAME) variable contains spaces)
    $(call -build-info,Please fix the error and start again.)
    $(call -build-error,Aborting)
  endif
endif

modules-reset-imports = \
  $(eval __build_import_dirs :=)\
  $(foreach __import_path,$(subst $(BUILD_HOST_DIRSEP),$(space),$(BUILD_MODULE_PATH)),\
    $(call import-add-path,$(__import_path))\
   )

# described in docs/IMPORT-MODULE.TXT
# $1: tag name for the lookup
#
# Small technical note on __build_import_depth: we use this variable to
# record the depth of recursive import-module calls. The variable is
# initially empty, and we append a "x" to it each time import-module is
# called. I.e. for three recursive calls to import-module, we would get
# the values:
#
#   first call:   x
#   second call:  xx
#   third call:   xxx
#
# This is used in module-add to add the top-level modules (i.e. those
# that are not added with import-module) to __build_top_modules, corresponding
# to the default list of wanted modules (see setup-toolchain.mk).
#
import-module = \
    $(eval __import_tag := $(strip $1))\
    $(if $(call seq,$(words $(__import_tag)),1),,\
      $(call -build-info,$(LOCAL_MAKEFILE): Cannot import module with spaces in tag: '$(__import_tag)')\
    )\
    $(if $(call set_is_member,$(__build_import_list),$(__import_tag)),\
      $(call -build-log,Skipping duplicate import for module with tag '$(__import_tag)')\
    ,\
      $(call -build-log,Looking for imported module with tag '$(__import_tag)')\
      $(eval __imported_path := $(call import-find-module,$(__import_tag)))\
      $(if $(__imported_path),\
        $(call -build-log,    Found in $(__imported_path))\
        $(eval __build_import_depth := $(__build_import_depth)x) \
        $(eval __build_import_list := $(call set_insert,$(__build_import_list),$(__import_tag)))\
        $(eval include $(__imported_path)/Android.mk)\
        $(eval __build_import_depth := $(__build_import_depth:%x=%))\
      ,\
        $(call -build-info,$(LOCAL_MAKEFILE): Cannot find module with tag '$(__import_tag)' in import path)\
        $(call -build-info,Are you sure your $(BUILD_MODULE_PATH_VARNAME) variable is properly defined ?)\
        $(call -build-info,The following directories were searched:)\
        $(for __import_dir,$(__build_import_dirs),\
          $(call -build-info,    $(__import_dir))\
        )\
        $(call -build-error,Aborting.)\
      )\
   )

# Only used for debugging
#
import-debug = \
    $(info IMPORT DIRECTORIES:)\
    $(foreach __dir,$(__build_import_dirs),\
      $(info -- $(__dir))\
    )\

#
#  Module classes
#
_build_module_classes :=

# Register a new module class
# $1: class name (e.g. STATIC_LIBRARY)
# $2: optional file prefix (e.g. 'lib')
# $3: optional file suffix (e.g. '.so')
#
module-class-register = \
    $(eval _build_module_classes += $1) \
    $(eval _build_module_class.$1.FILE_PREFIX := $2) \
    $(eval _build_module_class.$1.FILE_SUFFIX := $3) \
    $(eval _build_module_class.$1.INSTALLABLE := $(false)) \

# Same a module-class-register, for installable modules
#
# An installable module is one that will be copied to $PROJECT/libs/<abi>/
# during the build.
#
# $1: class name
# $2: optional file prefix
# $3: optional file suffix
#
module-class-register-installable = \
    $(call module-class-register,$1,$2,$3) \
    $(eval _build_module_class.$1.INSTALLABLE := $(true))

# Returns $(true) if $1 is a valid/registered LOCAL_MODULE_CLASS value
#
module-class-check = $(call set_is_member,$(_build_module_classes),$1)

# Returns $(true) if $1 corresponds to an installable module class
#
module-class-is-installable = $(if $(_build_module_class.$1.INSTALLABLE),$(true),$(false))

#
# Register valid module classes
#

# static libraries:
# <foo> -> lib<foo>.a by default
$(call module-class-register,STATIC_LIBRARY,lib,$(TARGET_LIB_EXTENSION))

# shared libraries:
# <foo> -> lib<foo>.so
# a shared library is installable.
$(call module-class-register-installable,SHARED_LIBRARY,lib,$(TARGET_SONAME_EXTENSION))

# executable
# <foo> -> <foo>
# an executable is installable.
$(call module-class-register-installable,EXECUTABLE,,)

# prebuilt shared library
# <foo> -> <foo>  (we assume it is already well-named)
# it is installable
$(call module-class-register-installable,PREBUILT_SHARED_LIBRARY,,)

# prebuilt static library
# <foo> -> <foo> (we assume it is already well-named)
$(call module-class-register,PREBUILT_STATIC_LIBRARY,,)