arch: Move the ISA parser into a package.

This will make splitting the parser into components easier, since it
will keep help keep everything together and organized.

Change-Id: I737641e124b6da8b1b18a49de9110c8424d8cc4f
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/35277
Reviewed-by: Gabe Black <gabeblack@google.com>
Maintainer: Gabe Black <gabeblack@google.com>
Tested-by: kokoro <noreply+kokoro@google.com>

src/arch/SConscript

@@ -105,15 +105,17 @@ SCons.Tool.SourceFileScanner.add_scanner('.cc.inc', SCons.Tool.CScanner)
 # output from the ISA description (*.isa) files.
 #
 
-parser_py = File('isa_parser.py')
+parser_files = Glob('isa_parser/*.py')
 micro_asm_py = File('micro_asm.py')
 
 # import ply here because SCons screws with sys.path when performing actions.
 import ply
 
+arch_dir = Dir('.')
+
 def run_parser(target, source, env):
     # Add the current directory to the system path so we can import files.
-    sys.path[0:0] = [ parser_py.dir.abspath ]
+    sys.path[0:0] = [ arch_dir.abspath ]
     import isa_parser
 
     parser = isa_parser.ISAParser(target[0].dir.abspath)
@@ -207,7 +209,7 @@ def ISADesc(desc, decoder_splits=1, exec_splits=1):
             source_gen('generic_cpu_exec_%d.cc' % i)
 
     # Actually create the builder.
-    sources = [desc, parser_py, micro_asm_py]
+    sources = [desc, micro_asm_py] + parser_files
     IsaDescBuilder(target=gen, source=sources, env=env)
     return gen
 

src/arch/isa_parser/__init__.py

@@ -0,0 +1,26 @@
+# Copyright 2020 Google, Inc.
+#
+# 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.
+
+from .isa_parser import ISAParser