# -*- 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 sys

Import('*')

#################################################################
#
# 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('''
        faults.hh
        interrupts.hh
        isa.hh
        isa_traits.hh
        kernel_stats.hh
        locked_mem.hh
        microcode_rom.hh
        mmapped_ipr.hh
        mt.hh
        process.hh
        predecoder.hh
        registers.hh
        remote_gdb.hh
        stacktrace.hh
        tlb.hh
        types.hh
        utility.hh
        vtophys.hh
        ''')

# Set up this directory to support switching headers
make_switching_dir('arch', isa_switch_hdrs, env)

#################################################################
#
# 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.
#

# 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):
    cpu_models = list(env['CPU_MODELS'])
    if env['USE_CHECKER']:
        cpu_models.append('CheckerCPU')

    # Several files are generated from the ISA description.
    # We always get the basic decoder and header file.
    target = [ 'decoder.cc', 'decoder.hh', 'max_inst_regs.hh' ]
    # We also get an execute file for each selected CPU model.
    target += [CpuModel.dict[cpu].filename for cpu in cpu_models]

    return target, source + [ Value(m) for m in cpu_models ]

ARCH_DIR = Dir('.')

# import ply here because SCons screws with sys.path when performing actions.
import ply

def isa_desc_action_func(target, source, env):
    # Add the current directory to the system path so we can import files
    sys.path[0:0] = [ ARCH_DIR.srcnode().abspath ]
    import isa_parser

    models = [ s.get_contents() for s in source[1:] ]
    cpu_models = [CpuModel.dict[cpu] for cpu in models]
    parser = isa_parser.ISAParser(target[0].dir.abspath, cpu_models)
    parser.parse_isa_desc(source[0].abspath)
isa_desc_action = MakeAction(isa_desc_action_func, Transform("ISA DESC", 1))

# Also include the CheckerCPU as one of the models if it is being
# enabled via command line.
isa_desc_builder = Builder(action=isa_desc_action, emitter=isa_desc_emitter)

env.Append(BUILDERS = { 'ISADesc' : isa_desc_builder })

TraceFlag('IntRegs')
TraceFlag('FloatRegs')
TraceFlag('MiscRegs')
CompoundFlag('Registers', [ 'IntRegs', 'FloatRegs', 'MiscRegs' ])