python, hg: tow outside the environment.

they've served us well, and can ride off into the sunset.

1 files changed, 0 insertions, 782 deletions

diff --git a/sys/src/cmd/python/Parser/asdl_c.py b/sys/src/cmd/python/Parser/asdl_c.py
deleted file mode 100755
index 2974d7b15..000000000
--- a/sys/src/cmd/python/Parser/asdl_c.py
+++ /dev/null
@@ -1,782 +0,0 @@
-#! /usr/bin/env python
-"""Generate C code from an ASDL description."""
-
-# TO DO
-# handle fields that have a type but no name
-
-import os, sys, traceback
-
-import asdl
-
-TABSIZE = 8
-MAX_COL = 80
-
-def get_c_type(name):
-    """Return a string for the C name of the type.
-
-    This function special cases the default types provided by asdl:
-    identifier, string, int, bool.
-    """
-    # XXX ack!  need to figure out where Id is useful and where string
-    if isinstance(name, asdl.Id):
-        name = name.value
-    if name in asdl.builtin_types:
-        return name
-    else:
-        return "%s_ty" % name
-
-def reflow_lines(s, depth):
-    """Reflow the line s indented depth tabs.
-
-    Return a sequence of lines where no line extends beyond MAX_COL
-    when properly indented.  The first line is properly indented based
-    exclusively on depth * TABSIZE.  All following lines -- these are
-    the reflowed lines generated by this function -- start at the same
-    column as the first character beyond the opening { in the first
-    line.
-    """
-    size = MAX_COL - depth * TABSIZE
-    if len(s) < size:
-        return [s]
-
-    lines = []
-    cur = s
-    padding = ""
-    while len(cur) > size:
-        i = cur.rfind(' ', 0, size)
-        # XXX this should be fixed for real
-        if i == -1 and 'GeneratorExp' in cur:
-            i = size + 3
-        assert i != -1, "Impossible line %d to reflow: %s" % (size, `s`)
-        lines.append(padding + cur[:i])
-        if len(lines) == 1:
-            # find new size based on brace
-            j = cur.find('{', 0, i)
-            if j >= 0:
-                j += 2 # account for the brace and the space after it
-                size -= j
-                padding = " " * j
-            else:
-                j = cur.find('(', 0, i)
-                if j >= 0:
-                    j += 1 # account for the paren (no space after it)
-                    size -= j
-                    padding = " " * j
-        cur = cur[i+1:]
-    else:
-        lines.append(padding + cur)
-    return lines
-
-def is_simple(sum):
-    """Return True if a sum is a simple.
-
-    A sum is simple if its types have no fields, e.g.
-    unaryop = Invert | Not | UAdd | USub
-    """
-
-    for t in sum.types:
-        if t.fields:
-            return False
-    return True
-
-class EmitVisitor(asdl.VisitorBase):
-    """Visit that emits lines"""
-
-    def __init__(self, file):
-        self.file = file
-        super(EmitVisitor, self).__init__()
-
-    def emit(self, s, depth, reflow=1):
-        # XXX reflow long lines?
-        if reflow:
-            lines = reflow_lines(s, depth)
-        else:
-            lines = [s]
-        for line in lines:
-            line = (" " * TABSIZE * depth) + line + "\n"
-            self.file.write(line)
-
-class TypeDefVisitor(EmitVisitor):
-    def visitModule(self, mod):
-        for dfn in mod.dfns:
-            self.visit(dfn)
-
-    def visitType(self, type, depth=0):
-        self.visit(type.value, type.name, depth)
-
-    def visitSum(self, sum, name, depth):
-        if is_simple(sum):
-            self.simple_sum(sum, name, depth)
-        else:
-            self.sum_with_constructors(sum, name, depth)
-
-    def simple_sum(self, sum, name, depth):
-        enum = []
-        for i in range(len(sum.types)):
-            type = sum.types[i]
-            enum.append("%s=%d" % (type.name, i + 1))
-        enums = ", ".join(enum)
-        ctype = get_c_type(name)
-        s = "typedef enum _%s { %s } %s;" % (name, enums, ctype)
-        self.emit(s, depth)
-        self.emit("", depth)
-
-    def sum_with_constructors(self, sum, name, depth):
-        ctype = get_c_type(name)
-        s = "typedef struct _%(name)s *%(ctype)s;" % locals()
-        self.emit(s, depth)
-        self.emit("", depth)
-
-    def visitProduct(self, product, name, depth):
-        ctype = get_c_type(name)
-        s = "typedef struct _%(name)s *%(ctype)s;" % locals()
-        self.emit(s, depth)
-        self.emit("", depth)
-
-class StructVisitor(EmitVisitor):
-    """Visitor to generate typdefs for AST."""
-
-    def visitModule(self, mod):
-        for dfn in mod.dfns:
-            self.visit(dfn)
-
-    def visitType(self, type, depth=0):
-        self.visit(type.value, type.name, depth)
-
-    def visitSum(self, sum, name, depth):
-        if not is_simple(sum):
-            self.sum_with_constructors(sum, name, depth)
-
-    def sum_with_constructors(self, sum, name, depth):
-        def emit(s, depth=depth):
-            self.emit(s % sys._getframe(1).f_locals, depth)
-        enum = []
-        for i in range(len(sum.types)):
-            type = sum.types[i]
-            enum.append("%s_kind=%d" % (type.name, i + 1))
-
-        emit("enum _%(name)s_kind {" + ", ".join(enum) + "};")
-
-        emit("struct _%(name)s {")
-        emit("enum _%(name)s_kind kind;", depth + 1)
-        emit("union {", depth + 1)
-        for t in sum.types:
-            self.visit(t, depth + 2)
-        emit("} v;", depth + 1)
-        for field in sum.attributes:
-            # rudimentary attribute handling
-            type = str(field.type)
-            assert type in asdl.builtin_types, type
-            emit("%s %s;" % (type, field.name), depth + 1);
-        emit("};")
-        emit("")
-
-    def visitConstructor(self, cons, depth):
-        if cons.fields:
-            self.emit("struct {", depth)
-            for f in cons.fields:
-                self.visit(f, depth + 1)
-            self.emit("} %s;" % cons.name, depth)
-            self.emit("", depth)
-        else:
-            # XXX not sure what I want here, nothing is probably fine
-            pass
-
-    def visitField(self, field, depth):
-        # XXX need to lookup field.type, because it might be something
-        # like a builtin...
-        ctype = get_c_type(field.type)
-        name = field.name
-        if field.seq:
-            if field.type.value in ('cmpop',):
-                self.emit("asdl_int_seq *%(name)s;" % locals(), depth)
-            else:
-                self.emit("asdl_seq *%(name)s;" % locals(), depth)
-        else:
-            self.emit("%(ctype)s %(name)s;" % locals(), depth)
-
-    def visitProduct(self, product, name, depth):
-        self.emit("struct _%(name)s {" % locals(), depth)
-        for f in product.fields:
-            self.visit(f, depth + 1)
-        self.emit("};", depth)
-        self.emit("", depth)
-
-class PrototypeVisitor(EmitVisitor):
-    """Generate function prototypes for the .h file"""
-
-    def visitModule(self, mod):
-        for dfn in mod.dfns:
-            self.visit(dfn)
-
-    def visitType(self, type):
-        self.visit(type.value, type.name)
-
-    def visitSum(self, sum, name):
-        if is_simple(sum):
-            pass # XXX
-        else:
-            for t in sum.types:
-                self.visit(t, name, sum.attributes)
-
-    def get_args(self, fields):
-        """Return list of C argument into, one for each field.
-
-        Argument info is 3-tuple of a C type, variable name, and flag
-        that is true if type can be NULL.
-        """
-        args = []
-        unnamed = {}
-        for f in fields:
-            if f.name is None:
-                name = f.type
-                c = unnamed[name] = unnamed.get(name, 0) + 1
-                if c > 1:
-                    name = "name%d" % (c - 1)
-            else:
-                name = f.name
-            # XXX should extend get_c_type() to handle this
-            if f.seq:
-                if f.type.value in ('cmpop',):
-                    ctype = "asdl_int_seq *"
-                else:
-                    ctype = "asdl_seq *"
-            else:
-                ctype = get_c_type(f.type)
-            args.append((ctype, name, f.opt or f.seq))
-        return args
-
-    def visitConstructor(self, cons, type, attrs):
-        args = self.get_args(cons.fields)
-        attrs = self.get_args(attrs)
-        ctype = get_c_type(type)
-        self.emit_function(cons.name, ctype, args, attrs)
-
-    def emit_function(self, name, ctype, args, attrs, union=1):
-        args = args + attrs
-        if args:
-            argstr = ", ".join(["%s %s" % (atype, aname)
-                                for atype, aname, opt in args])
-            argstr += ", PyArena *arena"
-        else:
-            argstr = "PyArena *arena"
-        margs = "a0"
-        for i in range(1, len(args)+1):
-            margs += ", a%d" % i
-        self.emit("#define %s(%s) _Py_%s(%s)" % (name, margs, name, margs), 0,
-                reflow = 0)
-        self.emit("%s _Py_%s(%s);" % (ctype, name, argstr), 0)
-
-    def visitProduct(self, prod, name):
-        self.emit_function(name, get_c_type(name),
-                           self.get_args(prod.fields), [], union=0)
-
-class FunctionVisitor(PrototypeVisitor):
-    """Visitor to generate constructor functions for AST."""
-
-    def emit_function(self, name, ctype, args, attrs, union=1):
-        def emit(s, depth=0, reflow=1):
-            self.emit(s, depth, reflow)
-        argstr = ", ".join(["%s %s" % (atype, aname)
-                            for atype, aname, opt in args + attrs])
-        if argstr:
-            argstr += ", PyArena *arena"
-        else:
-            argstr = "PyArena *arena"
-        self.emit("%s" % ctype, 0)
-        emit("%s(%s)" % (name, argstr))
-        emit("{")
-        emit("%s p;" % ctype, 1)
-        for argtype, argname, opt in args:
-            # XXX hack alert: false is allowed for a bool
-            if not opt and not (argtype == "bool" or argtype == "int"):
-                emit("if (!%s) {" % argname, 1)
-                emit("PyErr_SetString(PyExc_ValueError,", 2)
-                msg = "field %s is required for %s" % (argname, name)
-                emit('                "%s");' % msg,
-                     2, reflow=0)
-                emit('return NULL;', 2)
-                emit('}', 1)
-
-        emit("p = (%s)PyArena_Malloc(arena, sizeof(*p));" % ctype, 1);
-        emit("if (!p) {", 1)
-        emit("PyErr_NoMemory();", 2)
-        emit("return NULL;", 2)
-        emit("}", 1)
-        if union:
-            self.emit_body_union(name, args, attrs)
-        else:
-            self.emit_body_struct(name, args, attrs)
-        emit("return p;", 1)
-        emit("}")
-        emit("")
-
-    def emit_body_union(self, name, args, attrs):
-        def emit(s, depth=0, reflow=1):
-            self.emit(s, depth, reflow)
-        emit("p->kind = %s_kind;" % name, 1)
-        for argtype, argname, opt in args:
-            emit("p->v.%s.%s = %s;" % (name, argname, argname), 1)
-        for argtype, argname, opt in attrs:
-            emit("p->%s = %s;" % (argname, argname), 1)
-
-    def emit_body_struct(self, name, args, attrs):
-        def emit(s, depth=0, reflow=1):
-            self.emit(s, depth, reflow)
-        for argtype, argname, opt in args:
-            emit("p->%s = %s;" % (argname, argname), 1)
-        assert not attrs
-
-class PickleVisitor(EmitVisitor):
-
-    def visitModule(self, mod):
-        for dfn in mod.dfns:
-            self.visit(dfn)
-
-    def visitType(self, type):
-        self.visit(type.value, type.name)
-
-    def visitSum(self, sum, name):
-        pass
-
-    def visitProduct(self, sum, name):
-        pass
-
-    def visitConstructor(self, cons, name):
-        pass
-
-    def visitField(self, sum):
-        pass
-
-class MarshalPrototypeVisitor(PickleVisitor):
-
-    def prototype(self, sum, name):
-        ctype = get_c_type(name)
-        self.emit("static int marshal_write_%s(PyObject **, int *, %s);"
-                  % (name, ctype), 0)
-
-    visitProduct = visitSum = prototype
-
-class PyTypesDeclareVisitor(PickleVisitor):
-
-    def visitProduct(self, prod, name):
-        self.emit("static PyTypeObject *%s_type;" % name, 0)
-        self.emit("static PyObject* ast2obj_%s(void*);" % name, 0)
-        if prod.fields:
-            self.emit("static char *%s_fields[]={" % name,0)
-            for f in prod.fields:
-                self.emit('"%s",' % f.name, 1)
-            self.emit("};", 0)
-
-    def visitSum(self, sum, name):
-        self.emit("static PyTypeObject *%s_type;" % name, 0)
-        if sum.attributes:
-            self.emit("static char *%s_attributes[] = {" % name, 0)
-            for a in sum.attributes:
-                self.emit('"%s",' % a.name, 1)
-            self.emit("};", 0)
-        ptype = "void*"
-        if is_simple(sum):
-            ptype = get_c_type(name)
-            tnames = []
-            for t in sum.types:
-                tnames.append(str(t.name)+"_singleton")
-            tnames = ", *".join(tnames)
-            self.emit("static PyObject *%s;" % tnames, 0)
-        self.emit("static PyObject* ast2obj_%s(%s);" % (name, ptype), 0)
-        for t in sum.types:
-            self.visitConstructor(t, name)
-
-    def visitConstructor(self, cons, name):
-        self.emit("static PyTypeObject *%s_type;" % cons.name, 0)
-        if cons.fields:
-            self.emit("static char *%s_fields[]={" % cons.name, 0)
-            for t in cons.fields:
-                self.emit('"%s",' % t.name, 1)
-            self.emit("};",0)
-
-class PyTypesVisitor(PickleVisitor):
-
-    def visitModule(self, mod):
-        self.emit("""
-static PyTypeObject* make_type(char *type, PyTypeObject* base, char**fields, int num_fields)
-{
-    PyObject *fnames, *result;
-    int i;
-    if (num_fields) {
-        fnames = PyTuple_New(num_fields);
-        if (!fnames) return NULL;
-    } else {
-        fnames = Py_None;
-        Py_INCREF(Py_None);
-    }
-    for(i=0; i < num_fields; i++) {
-        PyObject *field = PyString_FromString(fields[i]);
-        if (!field) {
-            Py_DECREF(fnames);
-            return NULL;
-        }
-        PyTuple_SET_ITEM(fnames, i, field);
-    }
-    result = PyObject_CallFunction((PyObject*)&PyType_Type, "s(O){sOss}",
-                    type, base, "_fields", fnames, "__module__", "_ast");
-    Py_DECREF(fnames);
-    return (PyTypeObject*)result;
-}
-
-static int add_attributes(PyTypeObject* type, char**attrs, int num_fields)
-{
-    int i, result;
-    PyObject *s, *l = PyList_New(num_fields);
-    if (!l) return 0;
-    for(i = 0; i < num_fields; i++) {
-        s = PyString_FromString(attrs[i]);
-        if (!s) {
-            Py_DECREF(l);
-            return 0;
-        }
-        PyList_SET_ITEM(l, i, s);
-    }
-    result = PyObject_SetAttrString((PyObject*)type, "_attributes", l) >= 0;
-    Py_DECREF(l);
-    return result;
-}
-
-static PyObject* ast2obj_list(asdl_seq *seq, PyObject* (*func)(void*))
-{
-    int i, n = asdl_seq_LEN(seq);
-    PyObject *result = PyList_New(n);
-    PyObject *value;
-    if (!result)
-        return NULL;
-    for (i = 0; i < n; i++) {
-        value = func(asdl_seq_GET(seq, i));
-        if (!value) {
-            Py_DECREF(result);
-            return NULL;
-        }
-        PyList_SET_ITEM(result, i, value);
-    }
-    return result;
-}
-
-static PyObject* ast2obj_object(void *o)
-{
-    if (!o)
-        o = Py_None;
-    Py_INCREF((PyObject*)o);
-    return (PyObject*)o;
-}
-#define ast2obj_identifier ast2obj_object
-#define ast2obj_string ast2obj_object
-static PyObject* ast2obj_bool(bool b)
-{
-    return PyBool_FromLong(b);
-}
-
-static PyObject* ast2obj_int(bool b)
-{
-    return PyInt_FromLong(b);
-}
-""", 0, reflow=False)
-
-        self.emit("static int init_types(void)",0)
-        self.emit("{", 0)
-        self.emit("static int initialized;", 1)
-        self.emit("if (initialized) return 1;", 1)
-        self.emit('AST_type = make_type("AST", &PyBaseObject_Type, NULL, 0);', 1)
-        for dfn in mod.dfns:
-            self.visit(dfn)
-        self.emit("initialized = 1;", 1)
-        self.emit("return 1;", 1);
-        self.emit("}", 0)
-
-    def visitProduct(self, prod, name):
-        if prod.fields:
-            fields = name.value+"_fields"
-        else:
-            fields = "NULL"
-        self.emit('%s_type = make_type("%s", AST_type, %s, %d);' %
-                        (name, name, fields, len(prod.fields)), 1)
-        self.emit("if (!%s_type) return 0;" % name, 1)
-
-    def visitSum(self, sum, name):
-        self.emit('%s_type = make_type("%s", AST_type, NULL, 0);' % (name, name), 1)
-        self.emit("if (!%s_type) return 0;" % name, 1)
-        if sum.attributes:
-            self.emit("if (!add_attributes(%s_type, %s_attributes, %d)) return 0;" %
-                            (name, name, len(sum.attributes)), 1)
-        else:
-            self.emit("if (!add_attributes(%s_type, NULL, 0)) return 0;" % name, 1)
-        simple = is_simple(sum)
-        for t in sum.types:
-            self.visitConstructor(t, name, simple)
-
-    def visitConstructor(self, cons, name, simple):
-        if cons.fields:
-            fields = cons.name.value+"_fields"
-        else:
-            fields = "NULL"
-        self.emit('%s_type = make_type("%s", %s_type, %s, %d);' %
-                            (cons.name, cons.name, name, fields, len(cons.fields)), 1)
-        self.emit("if (!%s_type) return 0;" % cons.name, 1)
-        if simple:
-            self.emit("%s_singleton = PyType_GenericNew(%s_type, NULL, NULL);" %
-                             (cons.name, cons.name), 1)
-            self.emit("if (!%s_singleton) return 0;" % cons.name, 1)
-
-class ASTModuleVisitor(PickleVisitor):
-
-    def visitModule(self, mod):
-        self.emit("PyMODINIT_FUNC", 0)
-        self.emit("init_ast(void)", 0)
-        self.emit("{", 0)
-        self.emit("PyObject *m, *d;", 1)
-        self.emit("if (!init_types()) return;", 1)
-        self.emit('m = Py_InitModule3("_ast", NULL, NULL);', 1)
-        self.emit("if (!m) return;", 1)
-        self.emit("d = PyModule_GetDict(m);", 1)
-        self.emit('if (PyDict_SetItemString(d, "AST", (PyObject*)AST_type) < 0) return;', 1)
-        self.emit('if (PyModule_AddIntConstant(m, "PyCF_ONLY_AST", PyCF_ONLY_AST) < 0)', 1)
-        self.emit("return;", 2)
-        # Value of version: "$Revision: 53490 $"
-        self.emit('if (PyModule_AddStringConstant(m, "__version__", "%s") < 0)' % mod.version.value[12:-3], 1)
-        self.emit("return;", 2)
-        for dfn in mod.dfns:
-            self.visit(dfn)
-        self.emit("}", 0)
-
-    def visitProduct(self, prod, name):
-        self.addObj(name)
-
-    def visitSum(self, sum, name):
-        self.addObj(name)
-        for t in sum.types:
-            self.visitConstructor(t, name)
-
-    def visitConstructor(self, cons, name):
-        self.addObj(cons.name)
-
-    def addObj(self, name):
-        self.emit('if (PyDict_SetItemString(d, "%s", (PyObject*)%s_type) < 0) return;' % (name, name), 1)
-
-_SPECIALIZED_SEQUENCES = ('stmt', 'expr')
-
-def find_sequence(fields, doing_specialization):
-    """Return True if any field uses a sequence."""
-    for f in fields:
-        if f.seq:
-            if not doing_specialization:
-                return True
-            if str(f.type) not in _SPECIALIZED_SEQUENCES:
-                return True
-    return False
-
-def has_sequence(types, doing_specialization):
-    for t in types:
-        if find_sequence(t.fields, doing_specialization):
-            return True
-    return False
-
-
-class StaticVisitor(PickleVisitor):
-    CODE = '''Very simple, always emit this static code.  Overide CODE'''
-
-    def visit(self, object):
-        self.emit(self.CODE, 0, reflow=False)
-
-class ObjVisitor(PickleVisitor):
-
-    def func_begin(self, name):
-        ctype = get_c_type(name)
-        self.emit("PyObject*", 0)
-        self.emit("ast2obj_%s(void* _o)" % (name), 0)
-        self.emit("{", 0)
-        self.emit("%s o = (%s)_o;" % (ctype, ctype), 1)
-        self.emit("PyObject *result = NULL, *value = NULL;", 1)
-        self.emit('if (!o) {', 1)
-        self.emit("Py_INCREF(Py_None);", 2)
-        self.emit('return Py_None;', 2)
-        self.emit("}", 1)
-        self.emit('', 0)
-
-    def func_end(self):
-        self.emit("return result;", 1)
-        self.emit("failed:", 0)
-        self.emit("Py_XDECREF(value);", 1)
-        self.emit("Py_XDECREF(result);", 1)
-        self.emit("return NULL;", 1)
-        self.emit("}", 0)
-        self.emit("", 0)
-
-    def visitSum(self, sum, name):
-        if is_simple(sum):
-            self.simpleSum(sum, name)
-            return
-        self.func_begin(name)
-        self.emit("switch (o->kind) {", 1)
-        for i in range(len(sum.types)):
-            t = sum.types[i]
-            self.visitConstructor(t, i + 1, name)
-        self.emit("}", 1)
-        for a in sum.attributes:
-            self.emit("value = ast2obj_%s(o->%s);" % (a.type, a.name), 1)
-            self.emit("if (!value) goto failed;", 1)
-            self.emit('if (PyObject_SetAttrString(result, "%s", value) < 0)' % a.name, 1)
-            self.emit('goto failed;', 2)
-            self.emit('Py_DECREF(value);', 1)
-        self.func_end()
-
-    def simpleSum(self, sum, name):
-        self.emit("PyObject* ast2obj_%s(%s_ty o)" % (name, name), 0)
-        self.emit("{", 0)
-        self.emit("switch(o) {", 1)
-        for t in sum.types:
-            self.emit("case %s:" % t.name, 2)
-            self.emit("Py_INCREF(%s_singleton);" % t.name, 3)
-            self.emit("return %s_singleton;" % t.name, 3)
-        self.emit("}", 1)
-        self.emit("return NULL; /* cannot happen */", 1)
-        self.emit("}", 0)
-
-    def visitProduct(self, prod, name):
-        self.func_begin(name)
-        self.emit("result = PyType_GenericNew(%s_type, NULL, NULL);" % name, 1);
-        self.emit("if (!result) return NULL;", 1)
-        for field in prod.fields:
-            self.visitField(field, name, 1, True)
-        self.func_end()
-
-    def visitConstructor(self, cons, enum, name):
-        self.emit("case %s_kind:" % cons.name, 1)
-        self.emit("result = PyType_GenericNew(%s_type, NULL, NULL);" % cons.name, 2);
-        self.emit("if (!result) goto failed;", 2)
-        for f in cons.fields:
-            self.visitField(f, cons.name, 2, False)
-        self.emit("break;", 2)
-
-    def visitField(self, field, name, depth, product):
-        def emit(s, d):
-            self.emit(s, depth + d)
-        if product:
-            value = "o->%s" % field.name
-        else:
-            value = "o->v.%s.%s" % (name, field.name)
-        self.set(field, value, depth)
-        emit("if (!value) goto failed;", 0)
-        emit('if (PyObject_SetAttrString(result, "%s", value) == -1)' % field.name, 0)
-        emit("goto failed;", 1)
-        emit("Py_DECREF(value);", 0)
-
-    def emitSeq(self, field, value, depth, emit):
-        emit("seq = %s;" % value, 0)
-        emit("n = asdl_seq_LEN(seq);", 0)
-        emit("value = PyList_New(n);", 0)
-        emit("if (!value) goto failed;", 0)
-        emit("for (i = 0; i < n; i++) {", 0)
-        self.set("value", field, "asdl_seq_GET(seq, i)", depth + 1)
-        emit("if (!value1) goto failed;", 1)
-        emit("PyList_SET_ITEM(value, i, value1);", 1)
-        emit("value1 = NULL;", 1)
-        emit("}", 0)
-
-    def set(self, field, value, depth):
-        if field.seq:
-            # XXX should really check for is_simple, but that requires a symbol table
-            if field.type.value == "cmpop":
-                # While the sequence elements are stored as void*,
-                # ast2obj_cmpop expects an enum
-                self.emit("{", depth)
-                self.emit("int i, n = asdl_seq_LEN(%s);" % value, depth+1)
-                self.emit("value = PyList_New(n);", depth+1)
-                self.emit("if (!value) goto failed;", depth+1)
-                self.emit("for(i = 0; i < n; i++)", depth+1)
-                # This cannot fail, so no need for error handling
-                self.emit("PyList_SET_ITEM(value, i, ast2obj_cmpop((cmpop_ty)asdl_seq_GET(%s, i)));" % value,
-                          depth+2, reflow=False)
-                self.emit("}", depth)
-            else:
-                self.emit("value = ast2obj_list(%s, ast2obj_%s);" % (value, field.type), depth)
-        else:
-            ctype = get_c_type(field.type)
-            self.emit("value = ast2obj_%s(%s);" % (field.type, value), depth, reflow=False)
-
-
-class PartingShots(StaticVisitor):
-
-    CODE = """
-PyObject* PyAST_mod2obj(mod_ty t)
-{
-    init_types();
-    return ast2obj_mod(t);
-}
-"""
-
-class ChainOfVisitors:
-    def __init__(self, *visitors):
-        self.visitors = visitors
-
-    def visit(self, object):
-        for v in self.visitors:
-            v.visit(object)
-            v.emit("", 0)
-
-def main(srcfile):
-    argv0 = sys.argv[0]
-    components = argv0.split(os.sep)
-    argv0 = os.sep.join(components[-2:])
-    auto_gen_msg = '/* File automatically generated by %s */\n' % argv0
-    mod = asdl.parse(srcfile)
-    if not asdl.check(mod):
-        sys.exit(1)
-    if INC_DIR:
-        p = "%s/%s-ast.h" % (INC_DIR, mod.name)
-        f = open(p, "wb")
-        print >> f, auto_gen_msg
-        print >> f, '#include "asdl.h"\n'
-        c = ChainOfVisitors(TypeDefVisitor(f),
-                            StructVisitor(f),
-                            PrototypeVisitor(f),
-                            )
-        c.visit(mod)
-        print >>f, "PyObject* PyAST_mod2obj(mod_ty t);"
-        f.close()
-
-    if SRC_DIR:
-        p = os.path.join(SRC_DIR, str(mod.name) + "-ast.c")
-        f = open(p, "wb")
-        print >> f, auto_gen_msg
-        print >> f, '#include "Python.h"'
-        print >> f, '#include "%s-ast.h"' % mod.name
-        print >> f
-        print >>f, "static PyTypeObject* AST_type;"
-        v = ChainOfVisitors(
-            PyTypesDeclareVisitor(f),
-            PyTypesVisitor(f),
-            FunctionVisitor(f),
-            ObjVisitor(f),
-            ASTModuleVisitor(f),
-            PartingShots(f),
-            )
-        v.visit(mod)
-        f.close()
-
-if __name__ == "__main__":
-    import sys
-    import getopt
-
-    INC_DIR = ''
-    SRC_DIR = ''
-    opts, args = getopt.getopt(sys.argv[1:], "h:c:")
-    if len(opts) != 1:
-        print "Must specify exactly one output file"
-        sys.exit(1)
-    for o, v in opts:
-        if o == '-h':
-            INC_DIR = v
-        if o == '-c':
-            SRC_DIR = v
-    if len(args) != 1:
-        print "Must specify single input file"
-        sys.exit(1)
-    main(args[0])