SConscript revision 2139 
1# -*- mode:python -*-
2
3# Copyright (c) 2006 The Regents of The University of Michigan
4# All rights reserved.
5#
6# Redistribution and use in source and binary forms, with or without
7# modification, are permitted provided that the following conditions are
8# met: redistributions of source code must retain the above copyright
9# notice, this list of conditions and the following disclaimer;
10# redistributions in binary form must reproduce the above copyright
11# notice, this list of conditions and the following disclaimer in the
12# documentation and/or other materials provided with the distribution;
13# neither the name of the copyright holders nor the names of its
14# contributors may be used to endorse or promote products derived from
15# this software without specific prior written permission.
16#
17# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
18# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
19# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
20# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
21# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
22# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
23# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
24# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
25# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
27# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28
29import os.path
30
31# Import build environment variable from SConstruct.
32Import('env')
33
34#
35# ISA "switch header" generation.
36#
37# Auto-generate arch headers that include the right ISA-specific
38# header based on the setting of THE_ISA preprocessor variable.
39
40# List of headers to generate
41isa_switch_hdrs = Split('''
42	isa_traits.hh
43        ''')
44
45# Generate the header.  target[0] is the full path of the output
46# header to generate.  'source' is a dummy variable, since we get the
47# list of ISAs from env['ALL_ISA_LIST'].
48def gen_switch_hdr(target, source, env):
49    fname = str(target[0])
50    basename = os.path.basename(fname)
51    f = open(fname, 'w')
52    f.write('#include "arch/isa_specific.hh"\n')
53    cond = '#if'
54    for isa in env['ALL_ISA_LIST']:
55        f.write('%s THE_ISA == %s_ISA\n#include "arch/%s/%s"\n'
56                % (cond, isa.upper(), isa, basename))
57        cond = '#elif'
58    f.write('#else\n#error "THE_ISA not set"\n#endif\n')
59    f.close()
60    return 0
61
62# String to print when generating header
63def gen_switch_hdr_string(target, source, env):
64    return "Generating ISA switch header " + str(target[0])
65
66# Build SCons Action object. 'varlist' specifies env vars that this
67# action depdnds on; when env['ALL_ISA_LIST'] changes these actions
68# should get re-executed.
69switch_hdr_action = Action(gen_switch_hdr, gen_switch_hdr_string,
70                           varlist=['ALL_ISA_LIST'])
71
72# Instantiate actions for each header
73for hdr in isa_switch_hdrs:
74    env.Command(hdr, [], switch_hdr_action)
75