SConscript revision 2292 
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# Right now there are no source files immediately in this directory
35sources = []
36
37#################################################################
38#
39# ISA "switch header" generation.
40#
41# Auto-generate arch headers that include the right ISA-specific
42# header based on the setting of THE_ISA preprocessor variable.
43#
44#################################################################
45
46# List of headers to generate
47isa_switch_hdrs = Split('''
48	isa_traits.hh
49	tlb.hh
50	process.hh
51	arguments.hh
52	stacktrace.hh
53	vtophys.hh
54	faults.hh
55        ''')
56
57# Generate the header.  target[0] is the full path of the output
58# header to generate.  'source' is a dummy variable, since we get the
59# list of ISAs from env['ALL_ISA_LIST'].
60def gen_switch_hdr(target, source, env):
61    fname = str(target[0])
62    basename = os.path.basename(fname)
63    f = open(fname, 'w')
64    f.write('#include "arch/isa_specific.hh"\n')
65    cond = '#if'
66    for isa in env['ALL_ISA_LIST']:
67        f.write('%s THE_ISA == %s_ISA\n#include "arch/%s/%s"\n'
68                % (cond, isa.upper(), isa, basename))
69        cond = '#elif'
70    f.write('#else\n#error "THE_ISA not set"\n#endif\n')
71    f.close()
72    return 0
73
74# String to print when generating header
75def gen_switch_hdr_string(target, source, env):
76    return "Generating ISA switch header " + str(target[0])
77
78# Build SCons Action object. 'varlist' specifies env vars that this
79# action depends on; when env['ALL_ISA_LIST'] changes these actions
80# should get re-executed.
81switch_hdr_action = Action(gen_switch_hdr, gen_switch_hdr_string,
82                           varlist=['ALL_ISA_LIST'])
83
84# Instantiate actions for each header
85for hdr in isa_switch_hdrs:
86    env.Command(hdr, [], switch_hdr_action)
87
88#################################################################
89#
90# Include architecture-specific files.
91#
92#################################################################
93
94#
95# Build a SCons scanner for ISA files
96#
97import SCons.Scanner
98
99def ISAScan():
100   return SCons.Scanner.Classic("ISAScan",
101                                "$ISASUFFIXES",
102                                "SRCDIR",
103                                '^[ \t]*##[ \t]*include[ \t]*"([^>"]+)"')
104
105def ISAPath(env, dir, target=None, source=None, a=None):
106   return (Dir(env['SRCDIR']), Dir('.'))   
107
108iscan = Scanner(function = ISAScan().scan, skeys = [".isa", ".ISA"],
109                path_function = ISAPath)
110env.Append(SCANNERS = iscan)
111
112#
113# Now create a Builder object that uses isa_parser.py to generate C++
114# output from the ISA description (*.isa) files.
115#
116
117# Convert to File node to fix path
118isa_parser = File('isa_parser.py')
119cpu_models_file = File('#m5/cpu/cpu_models.py')
120
121# This sucks in the defintions of the CpuModel objects.
122execfile(cpu_models_file.srcnode().abspath)
123
124# Several files are generated from the ISA description.
125# We always get the basic decoder and header file.
126isa_desc_gen_files = Split('decoder.cc decoder.hh')
127# We also get an execute file for each selected CPU model.
128isa_desc_gen_files += [CpuModel.dict[cpu].filename
129                       for cpu in env['CPU_MODELS']]
130
131# The emitter patches up the sources & targets to include the
132# autogenerated files as targets and isa parser itself as a source.
133def isa_desc_emitter(target, source, env):
134    return (isa_desc_gen_files, [isa_parser, cpu_models_file] + source)
135
136# Pieces are in place, so create the builder.
137isa_desc_builder = Builder(action='$SOURCES $TARGET.dir $CPU_MODELS',
138                           source_scanner = iscan,
139                           emitter = isa_desc_emitter)
140
141env.Append(BUILDERS = { 'ISADesc' : isa_desc_builder })
142
143#
144# Now include other ISA-specific sources from the ISA subdirectories.
145#
146
147isa = env['TARGET_ISA'] # someday this may be a list of ISAs
148
149# Let the target architecture define what additional sources it needs
150sources += SConscript(os.path.join(isa, 'SConscript'),
151                      exports = 'env', duplicate = False)
152
153Return('sources')
154