add python function writer, takes Appendix v3.0B pseudocode functions

and generates executable python

diff --git a/src/openpower/decoder/pseudo/pyfnwriter.py b/src/openpower/decoder/pseudo/pyfnwriter.py
new file mode 100644 (file)
index 0000000..c6e37b4
--- /dev/null
+++ b/src/openpower/decoder/pseudo/pyfnwriter.py
@@ -0,0 +1,72 @@
+# python code-writer for OpenPOWER ISA pseudo-code parsing
+
+import os
+import sys
+import shutil
+import subprocess
+from openpower.decoder.pseudo.functionreader import ISAFunctions
+from openpower.decoder.power_pseudo import convert_to_pure_python
+
+
+def get_isafn_src_dir():
+    fdir = os.path.abspath(os.path.dirname(__file__))
+    fdir = os.path.split(fdir)[0]
+    return os.path.join(fdir, "isafunctions")
+
+
+header = """\
+# auto-generated by pyfnwriter.py, do not edit or commit
+
+from openpower.decoder.isa.caller import inject
+from openpower.decoder.helpers import (EXTS, EXTS64, EXTZ64, ROTL64, ROTL32,
+                                 MASK, MASK32,
+                                 ne, eq, gt, ge, lt, le, ltu, gtu, length,
+                                 trunc_divs, trunc_rems, MULS, DIVS, MODS,
+                                 EXTS128, undefined,
+                                 DOUBLE, SINGLE,
+                                 FPADD32, FPSUB32, FPMUL32, FPDIV32,
+                                 FPADD64, FPSUB64, FPMUL64, FPDIV64,
+                                )
+from openpower.decoder.selectable_int import SelectableInt
+from openpower.decoder.selectable_int import selectconcat as concat
+
+# %s
+"""
+
+
+class PyISAFnWriter(ISAFunctions):
+    def __init__(self):
+        ISAFunctions.__init__(self)
+        self.pages_written = []
+
+    def write_pysource(self, pagename):
+        self.pages_written.append(pagename)
+        function = self.fns[pagename]
+        isadir = get_isafn_src_dir()
+        fname = os.path.join(isadir, "%s.py" % pagename)
+        with open(fname, "w") as f:
+            f.write(header % function['desc'])  # write out header
+            # go through all instructions
+            pcode = function['pcode']
+            print(pcode)
+            pycode = convert_to_pure_python(pcode)
+            f.write(pycode)
+
+
+def pyfnwriter():
+    isa = PyISAFnWriter()
+    write_isa_class = True
+    if len(sys.argv) == 1:  # quick way to do it
+        print(dir(isa))
+        sources = isa.fns.keys()
+    else:
+        sources = sys.argv[1:]
+        if sources[0] == "noall": # don't rewrite all.py
+            write_isa_class = False
+            sources.pop(0)
+    print ("sources", write_isa_class, sources)
+    for source in sources:
+        isa.write_pysource(source)
+
+if __name__ == '__main__':
+    pyfnwriter()