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      1 # Library Utility Functions
      2 #
      3 # This should be included following 'lib_info.mk'.
      4 
      5 # Function: GetCNAVar variable-name platform-key config arch
      6 #
      7 # Get a per-config-and-arch variable value.
      8 GetCNAVar = $(strip \
      9   $(or $($(2).$(1).$(3).$(4)), \
     10        $($(2).$(1).$(3)), \
     11        $($(2).$(1).$(4)), \
     12        $($(2).$(1))))
     13 
     14 # Function: SelectFunctionDir config arch function-name optimized
     15 #
     16 # Choose the appropriate implementation directory to use for 'function-name' in
     17 # the configuration 'config' and on given arch.
     18 SelectFunctionDir = $(strip \
     19   $(call Set,Tmp.SelectFunctionDir,$(call SelectFunctionDirs,$(1),$(2),$(3),$(4)))\
     20   $(if $(call streq,1,$(words $(Tmp.SelectFunctionDir))),\
     21        $(Tmp.SelectFunctionDir),\
     22        $(error SelectFunctionDir: invalid function name "$(3)" ($(strip\
     23                $(if $(call streq,0,$(words $(Tmp.SelectFunctionDir))),\
     24                     no such function,\
     25                     function implemented in multiple directories!!!))))))
     26 
     27 # Helper functions that select the entire list of subdirs where a function is
     28 # defined with a certain specificity.
     29 SelectFunctionDirs_Opt_ConfigAndArch = $(strip \
     30   $(foreach key,$(AvailableIn.$(3)),\
     31     $(if $(and $(call streq,Optimized,$($(key).Implementation)),\
     32                $(call contains,$($(key).OnlyConfigs),$(1)),\
     33                $(call contains,$($(key).OnlyArchs),$(2))),$(key),)))
     34 SelectFunctionDirs_Opt_Config = $(strip \
     35   $(foreach key,$(AvailableIn.$(3)),\
     36     $(if $(and $(call streq,Optimized,$($(key).Implementation)),\
     37                $(call contains,$($(key).OnlyConfigs),$(1))),$(key),)))
     38 SelectFunctionDirs_Opt_Arch = $(strip \
     39   $(foreach key,$(AvailableIn.$(3)),\
     40     $(if $(and $(call streq,Optimized,$($(key).Implementation)),\
     41                $(call contains,$($(key).OnlyArchs),$(2))),$(key),)))
     42 SelectFunctionDirs_Gen = $(strip \
     43   $(foreach key,$(AvailableIn.$(3)),\
     44     $(if $(call streq,Generic,$($(key).Implementation)),$(key))))
     45 
     46 # Helper function to select the right set of dirs in generic priority order.
     47 SelectFunctions_Gen = \
     48   $(or $(call SelectFunctionDirs_Gen,$(1),$(2),$(3)),\
     49        $(call SelectFunctionDirs_Opt_ConfigAndArch,$(1),$(2),$(3)), \
     50        $(call SelectFunctionDirs_Opt_Config,$(1),$(2),$(3)), \
     51        $(call SelectFunctionDirs_Opt_Arch,$(1),$(2),$(3)))
     52 
     53 # Helper function to select the right set of dirs in optimized priority order.
     54 SelectFunctions_Opt = \
     55   $(or $(call SelectFunctionDirs_Opt_ConfigAndArch,$(1),$(2),$(3)), \
     56        $(call SelectFunctionDirs_Opt_Config,$(1),$(2),$(3)), \
     57        $(call SelectFunctionDirs_Opt_Arch,$(1),$(2),$(3)), \
     58        $(call SelectFunctionDirs_Gen,$(1),$(2),$(3)))
     59 
     60 # Helper function to select the right set of dirs (which should be exactly one)
     61 # for a function.
     62 SelectFunctionDirs = \
     63   $(if $(call streq,1,$(4)),\
     64        $(call SelectFunctions_Opt,$(1),$(2),$(3)),\
     65        $(call SelectFunctions_Gen,$(1),$(2),$(3)))
     66