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# Library Utility Functions
#
# This should be included following 'lib_info.mk'.
# Function: GetCNAVar variable-name platform-key config arch
#
# Get a per-config-and-arch variable value.
GetCNAVar = $(strip \
$(or $($(2).$(1).$(3).$(4)), \
$($(2).$(1).$(3)), \
$($(2).$(1).$(4)), \
$($(2).$(1))))
# Function: SelectFunctionDir config arch function-name optimized
#
# Choose the appropriate implementation directory to use for 'function-name' in
# the configuration 'config' and on given arch.
SelectFunctionDir = $(strip \
$(call Set,Tmp.SelectFunctionDir,$(call SelectFunctionDirs,$(1),$(2),$(3),$(4)))\
$(if $(call streq,1,$(words $(Tmp.SelectFunctionDir))),\
$(Tmp.SelectFunctionDir),\
$(error SelectFunctionDir: invalid function name "$(3)" ($(strip\
$(if $(call streq,0,$(words $(Tmp.SelectFunctionDir))),\
no such function,\
function implemented in multiple directories!!!))))))
# Helper functions that select the entire list of subdirs where a function is
# defined with a certain specificity.
SelectFunctionDirs_Opt_ConfigAndArch = $(strip \
$(foreach key,$(AvailableIn.$(3)),\
$(if $(and $(call streq,Optimized,$($(key).Implementation)),\
$(call contains,$($(key).OnlyConfigs),$(1)),\
$(call contains,$($(key).OnlyArchs),$(2))),$(key),)))
SelectFunctionDirs_Opt_Config = $(strip \
$(foreach key,$(AvailableIn.$(3)),\
$(if $(and $(call streq,Optimized,$($(key).Implementation)),\
$(call contains,$($(key).OnlyConfigs),$(1))),$(key),)))
SelectFunctionDirs_Opt_Arch = $(strip \
$(foreach key,$(AvailableIn.$(3)),\
$(if $(and $(call streq,Optimized,$($(key).Implementation)),\
$(call contains,$($(key).OnlyArchs),$(2))),$(key),)))
SelectFunctionDirs_Gen = $(strip \
$(foreach key,$(AvailableIn.$(3)),\
$(if $(call streq,Generic,$($(key).Implementation)),$(key))))
# Helper function to select the right set of dirs in generic priority order.
SelectFunctions_Gen = \
$(or $(call SelectFunctionDirs_Gen,$(1),$(2),$(3)),\
$(call SelectFunctionDirs_Opt_ConfigAndArch,$(1),$(2),$(3)), \
$(call SelectFunctionDirs_Opt_Config,$(1),$(2),$(3)), \
$(call SelectFunctionDirs_Opt_Arch,$(1),$(2),$(3)))
# Helper function to select the right set of dirs in optimized priority order.
SelectFunctions_Opt = \
$(or $(call SelectFunctionDirs_Opt_ConfigAndArch,$(1),$(2),$(3)), \
$(call SelectFunctionDirs_Opt_Config,$(1),$(2),$(3)), \
$(call SelectFunctionDirs_Opt_Arch,$(1),$(2),$(3)), \
$(call SelectFunctionDirs_Gen,$(1),$(2),$(3)))
# Helper function to select the right set of dirs (which should be exactly one)
# for a function.
SelectFunctionDirs = \
$(if $(call streq,1,$(4)),\
$(call SelectFunctions_Opt,$(1),$(2),$(3)),\
$(call SelectFunctions_Gen,$(1),$(2),$(3)))
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