SConscript revision 12246:9ffa51416f39
1# -*- mode:python -*- 2 3# Copyright (c) 2016 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 tlb.hh 77 types.hh 78 utility.hh 79 vtophys.hh 80 '''), 81 env.subst('${TARGET_ISA}')) 82 83if env['BUILD_GPU']: 84 env.SwitchingHeaders( 85 Split(''' 86 gpu_decoder.hh 87 gpu_isa.hh 88 gpu_types.hh 89 '''), 90 env.subst('${TARGET_GPU_ISA}')) 91 92################################################################# 93# 94# Include architecture-specific files. 95# 96################################################################# 97 98# 99# Build a SCons scanner for ISA files 100# 101import SCons.Scanner 102import SCons.Tool 103 104scanner = SCons.Scanner.Classic("ISAScan", 105 [".isa", ".ISA"], 106 "SRCDIR", 107 r'^\s*##include\s+"([\w/.-]*)"') 108 109env.Append(SCANNERS=scanner) 110 111# Tell scons that when it sees a cc.inc file, it should scan it for includes. 112SCons.Tool.SourceFileScanner.add_scanner('.cc.inc', SCons.Tool.CScanner) 113 114# 115# Now create a Builder object that uses isa_parser.py to generate C++ 116# output from the ISA description (*.isa) files. 117# 118 119parser_py = File('isa_parser.py') 120micro_asm_py = File('micro_asm.py') 121 122# import ply here because SCons screws with sys.path when performing actions. 123import ply 124 125def run_parser(target, source, env): 126 # Add the current directory to the system path so we can import files. 127 sys.path[0:0] = [ parser_py.dir.abspath ] 128 import isa_parser 129 130 parser = isa_parser.ISAParser(target[0].dir.abspath) 131 parser.parse_isa_desc(source[0].abspath) 132 133desc_action = MakeAction(run_parser, Transform("ISA DESC", 1)) 134 135IsaDescBuilder = Builder(action=desc_action) 136 137 138# ISAs should use this function to set up an IsaDescBuilder and not try to 139# set one up manually. 140def ISADesc(desc, decoder_splits=1, exec_splits=1): 141 '''Set up a builder for an ISA description. 142 143 The decoder_splits and exec_splits parameters let us determine what 144 files the isa parser is actually going to generate. This needs to match 145 what files are actually generated, and there's no specific check for that 146 right now. 147 148 If the parser itself is responsible for generating a list of its products 149 and their dependencies, then using that output to set up the right 150 dependencies. This is what we used to do. The problem is that scons 151 fundamentally doesn't support using a build product to affect its graph 152 of possible products, dependencies, builders, etc. There are a couple ways 153 to work around that limitation. 154 155 One option is to compute dependencies while the build phase of scons is 156 running. That method can be quite complicated and cumbersome, because we 157 have to make sure our modifications are made before scons tries to 158 consume them. There's also no guarantee that this mechanism will work since 159 it subverts scons expectations and changes things behind its back. This 160 was implemented previously and constrained the builds parallelism 161 significantly. 162 163 Another option would be to recursively call scons to have it update the 164 list of products/dependencies during the setup phase of this invocation of 165 scons. The problem with that is that it would be very difficult to make 166 the sub-invocation of scons observe the options passed to the primary one 167 in all possible cases, or to even determine conclusively what the name of 168 the scons executable is in the first place. 169 170 Possible future changes to the isa parser might make it easier to 171 determine what files it would generate, perhaps because there was a more 172 direct correspondence between input files and output files. Or, if the 173 parser could run quickly and determine what its output files would be 174 without having do actually generate those files, then it could be run 175 unconditionally without slowing down all builds or touching the output 176 files unnecessarily. 177 ''' 178 generated_dir = File(desc).dir.up().Dir('generated') 179 def gen_file(name): 180 return generated_dir.File(name) 181 182 gen = [] 183 def add_gen(name): 184 gen.append(gen_file(name)) 185 186 # Tell scons about the various files the ISA parser will generate. 187 add_gen('decoder-g.cc.inc') 188 add_gen('decoder-ns.cc.inc') 189 add_gen('decode-method.cc.inc') 190 191 add_gen('decoder.hh') 192 add_gen('decoder-g.hh.inc') 193 add_gen('decoder-ns.hh.inc') 194 195 add_gen('exec-g.cc.inc') 196 add_gen('exec-ns.cc.inc') 197 198 add_gen('max_inst_regs.hh') 199 200 201 # These generated files are also top level sources. 202 def source_gen(name): 203 add_gen(name) 204 Source(gen_file(name)) 205 206 source_gen('decoder.cc') 207 208 if decoder_splits == 1: 209 source_gen('inst-constrs.cc') 210 else: 211 for i in range(1, decoder_splits + 1): 212 source_gen('inst-constrs-%d.cc' % i) 213 214 if exec_splits == 1: 215 source_gen('generic_cpu_exec.cc') 216 else: 217 for i in range(1, exec_splits + 1): 218 source_gen('generic_cpu_exec_%d.cc' % i) 219 220 # Actually create the builder. 221 sources = [desc, parser_py, micro_asm_py] 222 IsaDescBuilder(target=gen, source=sources, env=env) 223 return gen 224 225Export('ISADesc') 226 227DebugFlag('IntRegs') 228DebugFlag('FloatRegs') 229DebugFlag('VecRegs') 230DebugFlag('CCRegs') 231DebugFlag('MiscRegs') 232CompoundFlag('Registers', [ 'IntRegs', 'FloatRegs', 'CCRegs', 'MiscRegs' ]) 233