xref: /gem5/src/arch/SConscript

# -*- mode:python -*-

# Copyright (c) 2006 The Regents of The University of Michigan
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are
# met: redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer;
# redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in the
# documentation and/or other materials provided with the distribution;
# neither the name of the copyright holders nor the names of its
# contributors may be used to endorse or promote products derived from
# this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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import os.path

# Import build environment variable from SConstruct.
Import('env')

#
# ISA "switch header" generation.
#
# Auto-generate arch headers that include the right ISA-specific
# header based on the setting of THE_ISA preprocessor variable.

# List of headers to generate
isa_switch_hdrs = Split('''
	isa_traits.hh
        ''')

# Generate the header.  target[0] is the full path of the output
# header to generate.  'source' is a dummy variable, since we get the
# list of ISAs from env['ALL_ISA_LIST'].
def gen_switch_hdr(target, source, env):
    fname = str(target[0])
    basename = os.path.basename(fname)
    f = open(fname, 'w')
    f.write('#include "arch/isa_specific.hh"\n')
    cond = '#if'
    for isa in env['ALL_ISA_LIST']:
        f.write('%s THE_ISA == %s_ISA\n#include "arch/%s/%s"\n'
                % (cond, isa.upper(), isa, basename))
        cond = '#elif'
    f.write('#else\n#error "THE_ISA not set"\n#endif\n')
    f.close()
    return 0

# String to print when generating header
def gen_switch_hdr_string(target, source, env):
    return "Generating ISA switch header " + str(target[0])

# Build SCons Action object. 'varlist' specifies env vars that this
# action depdnds on; when env['ALL_ISA_LIST'] changes these actions
# should get re-executed.
switch_hdr_action = Action(gen_switch_hdr, gen_switch_hdr_string,
                           varlist=['ALL_ISA_LIST'])

# Instantiate actions for each header
for hdr in isa_switch_hdrs:
    env.Command(hdr, [], switch_hdr_action)