SConscript revision 11696 
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#
29# Authors: Steve Reinhardt
30
31import sys
32import os
33import re
34
35Import('*')
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        decoder.hh
49        interrupts.hh
50        isa.hh
51        isa_traits.hh
52        kernel_stats.hh
53        locked_mem.hh
54        microcode_rom.hh
55        mmapped_ipr.hh
56        mt.hh
57        process.hh
58        pseudo_inst.hh
59        registers.hh
60        remote_gdb.hh
61        stacktrace.hh
62        tlb.hh
63        types.hh
64        utility.hh
65        vtophys.hh
66        ''')
67
68# Set up this directory to support switching headers
69make_switching_dir('arch', isa_switch_hdrs, env)
70
71if env['BUILD_GPU']:
72    gpu_isa_switch_hdrs = Split('''
73            gpu_decoder.hh
74            gpu_isa.hh
75            gpu_types.hh
76            ''')
77
78    make_gpu_switching_dir('arch', gpu_isa_switch_hdrs, env)
79
80#################################################################
81#
82# Include architecture-specific files.
83#
84#################################################################
85
86#
87# Build a SCons scanner for ISA files
88#
89import SCons.Scanner
90
91isa_scanner = SCons.Scanner.Classic("ISAScan",
92                                    [".isa", ".ISA"],
93                                    "SRCDIR",
94                                    r'^\s*##include\s+"([\w/.-]*)"')
95
96env.Append(SCANNERS = isa_scanner)
97
98#
99# Now create a Builder object that uses isa_parser.py to generate C++
100# output from the ISA description (*.isa) files.
101#
102
103isa_parser = File('isa_parser.py')
104
105# The emitter patches up the sources & targets to include the
106# autogenerated files as targets and isa parser itself as a source.
107def isa_desc_emitter(target, source, env):
108    # List the isa parser as a source.
109    source += [
110        isa_parser,
111        Value("ExecContext"),
112        ]
113
114    # Specify different targets depending on if we're running the ISA
115    # parser for its dependency information, or for the generated files.
116    # (As an optimization, the ISA parser detects the useless second run
117    # and skips doing any work, if the first run was performed, since it
118    # always generates all its files). The way we track this in SCons is the
119    # <arch>_isa_outputs value in the environment (env). If it's unset, we
120    # don't know what the dependencies are so we ask for generated/inc.d to
121    # be generated so they can be acquired. If we know what they are, then
122    # it's because we've already processed inc.d and then claim that our
123    # outputs (targets) will be thus.
124    isa = env['TARGET_ISA']
125    key = '%s_isa_outputs' % isa
126    if key in env:
127        targets = [ os.path.join('generated', f) for f in env[key] ]
128    else:
129        targets = [ os.path.join('generated','inc.d') ]
130
131    def prefix(s):
132        return os.path.join(target[0].dir.up().abspath, s)
133
134    return [ prefix(t) for t in targets ], source
135
136ARCH_DIR = Dir('.')
137
138# import ply here because SCons screws with sys.path when performing actions.
139import ply
140
141def isa_desc_action_func(target, source, env):
142    # Add the current directory to the system path so we can import files
143    sys.path[0:0] = [ ARCH_DIR.srcnode().abspath ]
144    import isa_parser
145
146    # Skip over the ISA description itself and the parser to the CPU models.
147    models = [ s.get_contents() for s in source[2:] ]
148    parser = isa_parser.ISAParser(target[0].dir.abspath)
149    parser.parse_isa_desc(source[0].abspath)
150isa_desc_action = MakeAction(isa_desc_action_func, Transform("ISA DESC", 1))
151
152# Also include the CheckerCPU as one of the models if it is being
153# enabled via command line.
154isa_desc_builder = Builder(action=isa_desc_action, emitter=isa_desc_emitter)
155
156env.Append(BUILDERS = { 'ISADesc' : isa_desc_builder })
157
158# The ISA is generated twice: the first time to find out what it generates,
159# and the second time to make scons happy by telling the ISADesc builder
160# what it will make before it builds it.
161def scan_isa_deps(target, source, env):
162    # Process dependency file generated by the ISA parser --
163    # add the listed files to the dependency tree of the build.
164    source = source[0]
165    archbase = source.dir.up().path
166
167    try:
168        depfile = open(source.abspath, 'r')
169    except:
170        print "scan_isa_deps: Can't open ISA deps file '%s' in %s" % \
171              (source.path,os.getcwd())
172        raise
173
174    # Scan through the lines
175    targets = {}
176    for line in depfile:
177        # Read the dependency line with the format
178        # <target file>: [ <dependent file>* ]
179        m = re.match(r'^\s*([^:]+\.([^\.:]+))\s*:\s*(.*)', line)
180        assert(m)
181        targ, extn = m.group(1,2)
182        deps = m.group(3).split()
183
184        files = [ targ ] + deps
185        for f in files:
186            targets[f] = True
187            # Eliminate unnecessary re-generation if we already generated it
188            env.Precious(os.path.join(archbase, 'generated', f))
189
190        files = [ os.path.join(archbase, 'generated', f) for f in files ]
191
192        if extn == 'cc':
193            Source(os.path.join(archbase,'generated', targ))
194    depfile.close()
195    env[env['TARGET_ISA'] + '_isa_outputs'] = targets.keys()
196
197    isa = env.ISADesc(os.path.join(archbase,'isa','main.isa'))
198    for t in targets:
199        env.Depends('#all-isas', isa)
200
201env.Append(BUILDERS = {'ScanISA' :
202                        Builder(action=MakeAction(scan_isa_deps,
203                                                  Transform("NEW DEPS", 1)))})
204
205DebugFlag('IntRegs')
206DebugFlag('FloatRegs')
207DebugFlag('CCRegs')
208DebugFlag('MiscRegs')
209CompoundFlag('Registers', [ 'IntRegs', 'FloatRegs', 'CCRegs', 'MiscRegs' ])
210