SConscript revision 13610 
1# -*- mode:python -*-
2
3# Copyright (c) 2016-2017 ARM Limited
4# All rights reserved.
5#
6# The license below extends only to copyright in the software and shall
7# not be construed as granting a license to any other intellectual
8# property including but not limited to intellectual property relating
9# to a hardware implementation of the functionality of the software
10# licensed hereunder.  You may use the software subject to the license
11# terms below provided that you ensure that this notice is replicated
12# unmodified and in its entirety in all distributions of the software,
13# modified or unmodified, in source code or in binary form.
14#
15# Copyright (c) 2006 The Regents of The University of Michigan
16# All rights reserved.
17#
18# Redistribution and use in source and binary forms, with or without
19# modification, are permitted provided that the following conditions are
20# met: redistributions of source code must retain the above copyright
21# notice, this list of conditions and the following disclaimer;
22# redistributions in binary form must reproduce the above copyright
23# notice, this list of conditions and the following disclaimer in the
24# documentation and/or other materials provided with the distribution;
25# neither the name of the copyright holders nor the names of its
26# contributors may be used to endorse or promote products derived from
27# this software without specific prior written permission.
28#
29# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
30# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
31# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
32# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
33# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
34# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
35# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
36# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
37# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
38# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
39# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
40#
41# Authors: Steve Reinhardt
42
43import sys
44import os
45import re
46
47from gem5_scons import Transform
48
49Import('*')
50
51#################################################################
52#
53# ISA "switch header" generation.
54#
55# Auto-generate arch headers that include the right ISA-specific
56# header based on the setting of THE_ISA preprocessor variable.
57#
58#################################################################
59
60env.SwitchingHeaders(
61    Split('''
62        decoder.hh
63        interrupts.hh
64        isa.hh
65        isa_traits.hh
66        kernel_stats.hh
67        locked_mem.hh
68        microcode_rom.hh
69        mmapped_ipr.hh
70        mt.hh
71        process.hh
72        pseudo_inst.hh
73        registers.hh
74        remote_gdb.hh
75        stacktrace.hh
76        types.hh
77        utility.hh
78        vtophys.hh
79        '''),
80    env.subst('${TARGET_ISA}'))
81
82if env['BUILD_GPU']:
83    env.SwitchingHeaders(
84        Split('''
85            gpu_decoder.hh
86            gpu_isa.hh
87            gpu_types.hh
88            '''),
89        env.subst('${TARGET_GPU_ISA}'))
90
91#################################################################
92#
93# Include architecture-specific files.
94#
95#################################################################
96
97#
98# Build a SCons scanner for ISA files
99#
100import SCons.Scanner
101import SCons.Tool
102
103scanner = SCons.Scanner.Classic("ISAScan",
104                                [".isa", ".ISA"],
105                                 "SRCDIR",
106                                r'^\s*##include\s+"([\w/.-]*)"')
107
108env.Append(SCANNERS=scanner)
109
110# Tell scons that when it sees a cc.inc file, it should scan it for includes.
111SCons.Tool.SourceFileScanner.add_scanner('.cc.inc', SCons.Tool.CScanner)
112
113#
114# Now create a Builder object that uses isa_parser.py to generate C++
115# output from the ISA description (*.isa) files.
116#
117
118parser_py = File('isa_parser.py')
119micro_asm_py = File('micro_asm.py')
120
121# import ply here because SCons screws with sys.path when performing actions.
122import ply
123
124def run_parser(target, source, env):
125    # Add the current directory to the system path so we can import files.
126    sys.path[0:0] = [ parser_py.dir.abspath ]
127    import isa_parser
128
129    parser = isa_parser.ISAParser(target[0].dir.abspath)
130    parser.parse_isa_desc(source[0].abspath)
131
132desc_action = MakeAction(run_parser, Transform("ISA DESC", 1))
133
134IsaDescBuilder = Builder(action=desc_action)
135
136
137# ISAs should use this function to set up an IsaDescBuilder and not try to
138# set one up manually.
139def ISADesc(desc, decoder_splits=1, exec_splits=1):
140    '''Set up a builder for an ISA description.
141
142    The decoder_splits and exec_splits parameters let us determine what
143    files the isa parser is actually going to generate. This needs to match
144    what files are actually generated, and there's no specific check for that
145    right now.
146
147    If the parser itself is responsible for generating a list of its products
148    and their dependencies, then using that output to set up the right
149    dependencies. This is what we used to do. The problem is that scons
150    fundamentally doesn't support using a build product to affect its graph
151    of possible products, dependencies, builders, etc. There are a couple ways
152    to work around that limitation.
153
154    One option is to compute dependencies while the build phase of scons is
155    running. That method can be quite complicated and cumbersome, because we
156    have to make sure our modifications are made before scons tries to
157    consume them. There's also no guarantee that this mechanism will work since
158    it subverts scons expectations and changes things behind its back. This
159    was implemented previously and constrained the builds parallelism
160    significantly.
161
162    Another option would be to recursively call scons to have it update the
163    list of products/dependencies during the setup phase of this invocation of
164    scons. The problem with that is that it would be very difficult to make
165    the sub-invocation of scons observe the options passed to the primary one
166    in all possible cases, or to even determine conclusively what the name of
167    the scons executable is in the first place.
168
169    Possible future changes to the isa parser might make it easier to
170    determine what files it would generate, perhaps because there was a more
171    direct correspondence between input files and output files. Or, if the
172    parser could run quickly and determine what its output files would be
173    without having do actually generate those files, then it could be run
174    unconditionally without slowing down all builds or touching the output
175    files unnecessarily.
176    '''
177    generated_dir = File(desc).dir.up().Dir('generated')
178    def gen_file(name):
179        return generated_dir.File(name)
180
181    gen = []
182    def add_gen(name):
183        gen.append(gen_file(name))
184
185    # Tell scons about the various files the ISA parser will generate.
186    add_gen('decoder-g.cc.inc')
187    add_gen('decoder-ns.cc.inc')
188    add_gen('decode-method.cc.inc')
189
190    add_gen('decoder.hh')
191    add_gen('decoder-g.hh.inc')
192    add_gen('decoder-ns.hh.inc')
193
194    add_gen('exec-g.cc.inc')
195    add_gen('exec-ns.cc.inc')
196
197    add_gen('max_inst_regs.hh')
198
199
200    # These generated files are also top level sources.
201    def source_gen(name):
202        add_gen(name)
203        Source(gen_file(name))
204
205    source_gen('decoder.cc')
206
207    if decoder_splits == 1:
208        source_gen('inst-constrs.cc')
209    else:
210        for i in range(1, decoder_splits + 1):
211            source_gen('inst-constrs-%d.cc' % i)
212
213    if exec_splits == 1:
214        source_gen('generic_cpu_exec.cc')
215    else:
216        for i in range(1, exec_splits + 1):
217            source_gen('generic_cpu_exec_%d.cc' % i)
218
219    # Actually create the builder.
220    sources = [desc, parser_py, micro_asm_py]
221    IsaDescBuilder(target=gen, source=sources, env=env)
222    return gen
223
224Export('ISADesc')
225
226DebugFlag('IntRegs')
227DebugFlag('FloatRegs')
228DebugFlag('VecRegs')
229DebugFlag('VecPredRegs')
230DebugFlag('CCRegs')
231DebugFlag('MiscRegs')
232CompoundFlag('Registers', [ 'IntRegs', 'FloatRegs', 'VecRegs', 'VecPredRegs',
233                            'CCRegs', 'MiscRegs' ])
234