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# -*- mode:python -*-
# Copyright (c) 2006 The Regents of The University of Michigan
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are
# met: redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer;
# redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in the
# documentation and/or other materials provided with the distribution;
# neither the name of the copyright holders nor the names of its
# contributors may be used to endorse or promote products derived from
# this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#
# Authors: Steve Reinhardt
import os.path, sys
# Import build environment variable from SConstruct.
Import('env')
# Right now there are no source files immediately in this directory
sources = []
#################################################################
#
# ISA "switch header" generation.
#
# Auto-generate arch headers that include the right ISA-specific
# header based on the setting of THE_ISA preprocessor variable.
#
#################################################################
# List of headers to generate
isa_switch_hdrs = Split('''
arguments.hh
constants.hh
faults.hh
isa_traits.hh
process.hh
regfile.hh
stacktrace.hh
tlb.hh
types.hh
utility.hh
vtophys.hh
''')
# Generate the header. target[0] is the full path of the output
# header to generate. 'source' is a dummy variable, since we get the
# list of ISAs from env['ALL_ISA_LIST'].
def gen_switch_hdr(target, source, env):
fname = str(target[0])
basename = os.path.basename(fname)
f = open(fname, 'w')
f.write('#include "arch/isa_specific.hh"\n')
cond = '#if'
for isa in env['ALL_ISA_LIST']:
f.write('%s THE_ISA == %s_ISA\n#include "arch/%s/%s"\n'
% (cond, isa.upper(), isa, basename))
cond = '#elif'
f.write('#else\n#error "THE_ISA not set"\n#endif\n')
f.close()
return 0
# String to print when generating header
def gen_switch_hdr_string(target, source, env):
return "Generating ISA switch header " + str(target[0])
# Build SCons Action object. 'varlist' specifies env vars that this
# action depends on; when env['ALL_ISA_LIST'] changes these actions
# should get re-executed.
switch_hdr_action = Action(gen_switch_hdr, gen_switch_hdr_string,
varlist=['ALL_ISA_LIST'])
# Instantiate actions for each header
for hdr in isa_switch_hdrs:
env.Command(hdr, [], switch_hdr_action)
#################################################################
#
# Include architecture-specific files.
#
#################################################################
#
# Build a SCons scanner for ISA files
#
import SCons.Scanner
isa_scanner = SCons.Scanner.Classic("ISAScan",
[".isa", ".ISA"],
"SRCDIR",
r'^\s*##include\s+"([\w/.-]*)"')
env.Append(SCANNERS = isa_scanner)
#
# Now create a Builder object that uses isa_parser.py to generate C++
# output from the ISA description (*.isa) files.
#
# Convert to File node to fix path
isa_parser = File('isa_parser.py')
cpu_models_file = File('../cpu/cpu_models.py')
# This sucks in the defintions of the CpuModel objects.
execfile(cpu_models_file.srcnode().abspath)
# Several files are generated from the ISA description.
# We always get the basic decoder and header file.
isa_desc_gen_files = Split('decoder.cc decoder.hh')
# We also get an execute file for each selected CPU model.
isa_desc_gen_files += [CpuModel.dict[cpu].filename
for cpu in env['CPU_MODELS']]
# Also include the CheckerCPU as one of the models if it is being
# enabled via command line.
if env['USE_CHECKER']:
isa_desc_gen_files += [CpuModel.dict['CheckerCPU'].filename]
# The emitter patches up the sources & targets to include the
# autogenerated files as targets and isa parser itself as a source.
def isa_desc_emitter(target, source, env):
return (isa_desc_gen_files, [isa_parser, cpu_models_file] + source)
# Pieces are in place, so create the builder.
python = sys.executable # use same Python binary used to run scons
isa_desc_builder = Builder(action=python + ' $SOURCES $TARGET.dir $CPU_MODELS',
emitter = isa_desc_emitter)
env.Append(BUILDERS = { 'ISADesc' : isa_desc_builder })
#
# Now include other ISA-specific sources from the ISA subdirectories.
#
isa = env['TARGET_ISA'] # someday this may be a list of ISAs
# Let the target architecture define what additional sources it needs
sources += SConscript(os.path.join(isa, 'SConscript'), exports = 'env')
Return('sources')
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