site_scons/gem5_scons/builders/config_file.py

# Copyright (c) 2013, 2015-2020 ARM Limited
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# Copyright (c) 2011 Advanced Micro Devices, Inc.
# Copyright (c) 2009 The Hewlett-Packard Development Company
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from gem5_scons import Transform, MakeAction

###################################################
#
# Define a SCons builder for configuration flag headers.
#
###################################################

def ConfigFile(env):
    # This function generates a config header file that #defines the
    # variable symbol to the current variable setting (0 or 1).  The source
    # operands are the name of the variable and a Value node containing the
    # value of the variable.
    def build_config_file(target, source, env):
        (variable, value) = [s.get_contents().decode('utf-8') for s in source]
        with open(str(target[0].abspath), 'w') as f:
            print('#define', variable, value, file=f)
        return None

    # Combine the two functions into a scons Action object.
    config_action = MakeAction(build_config_file, Transform("CONFIG H", 2))

    # The emitter munges the source & target node lists to reflect what
    # we're really doing.
    def config_emitter(target, source, env):
        # extract variable name from Builder arg
        variable = str(target[0])
        # True target is config header file
        target = env.Dir('config').File(variable.lower() + '.hh')
        val = env[variable]
        if isinstance(val, bool):
            # Force value to 0/1
            val = int(val)
        elif isinstance(val, str):
            val = '"' + val + '"'

        # Sources are variable name & value (packaged in SCons Value nodes)
        return [target], [env.Value(variable), env.Value(val)]

    config_builder = env.Builder(emitter=config_emitter, action=config_action)

    env.Append(BUILDERS = { 'ConfigFile' : config_builder })