| #! /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 |
| import subprocess |
| |
| 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. |
| """ |
| # 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: %r" % (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=True): |
| # 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=True): |
| 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=False) |
| self.emit("%s _Py_%s(%s);" % (ctype, name, argstr), False) |
| |
| def visitProduct(self, prod, name): |
| self.emit_function(name, get_c_type(name), |
| self.get_args(prod.fields), [], union=False) |
| |
| |
| class FunctionVisitor(PrototypeVisitor): |
| """Visitor to generate constructor functions for AST.""" |
| |
| def emit_function(self, name, ctype, args, attrs, union=True): |
| def emit(s, depth=0, reflow=True): |
| 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: |
| if not opt and 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=False) |
| emit('return NULL;', 2) |
| emit('}', 1) |
| |
| emit("p = (%s)PyArena_Malloc(arena, sizeof(*p));" % ctype, 1); |
| emit("if (!p)", 1) |
| emit("return NULL;", 2) |
| 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=True): |
| 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=True): |
| 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 Obj2ModPrototypeVisitor(PickleVisitor): |
| def visitProduct(self, prod, name): |
| code = "static int obj2ast_%s(PyObject* obj, %s* out, PyArena* arena);" |
| self.emit(code % (name, get_c_type(name)), 0) |
| |
| visitSum = visitProduct |
| |
| |
| class Obj2ModVisitor(PickleVisitor): |
| def funcHeader(self, name): |
| ctype = get_c_type(name) |
| self.emit("int", 0) |
| self.emit("obj2ast_%s(PyObject* obj, %s* out, PyArena* arena)" % (name, ctype), 0) |
| self.emit("{", 0) |
| self.emit("int isinstance;", 1) |
| self.emit("", 0) |
| |
| def sumTrailer(self, name, add_label=False): |
| self.emit("", 0) |
| # there's really nothing more we can do if this fails ... |
| error = "expected some sort of %s, but got %%R" % name |
| format = "PyErr_Format(PyExc_TypeError, \"%s\", obj);" |
| self.emit(format % error, 1, reflow=False) |
| if add_label: |
| self.emit("failed:", 1) |
| self.emit("Py_XDECREF(tmp);", 1) |
| self.emit("return 1;", 1) |
| self.emit("}", 0) |
| self.emit("", 0) |
| |
| def simpleSum(self, sum, name): |
| self.funcHeader(name) |
| for t in sum.types: |
| line = ("isinstance = PyObject_IsInstance(obj, " |
| "(PyObject *)%s_type);") |
| self.emit(line % (t.name,), 1) |
| self.emit("if (isinstance == -1) {", 1) |
| self.emit("return 1;", 2) |
| self.emit("}", 1) |
| self.emit("if (isinstance) {", 1) |
| self.emit("*out = %s;" % t.name, 2) |
| self.emit("return 0;", 2) |
| self.emit("}", 1) |
| self.sumTrailer(name) |
| |
| def buildArgs(self, fields): |
| return ", ".join(fields + ["arena"]) |
| |
| def complexSum(self, sum, name): |
| self.funcHeader(name) |
| self.emit("PyObject *tmp = NULL;", 1) |
| for a in sum.attributes: |
| self.visitAttributeDeclaration(a, name, sum=sum) |
| self.emit("", 0) |
| # XXX: should we only do this for 'expr'? |
| self.emit("if (obj == Py_None) {", 1) |
| self.emit("*out = NULL;", 2) |
| self.emit("return 0;", 2) |
| self.emit("}", 1) |
| for a in sum.attributes: |
| self.visitField(a, name, sum=sum, depth=1) |
| for t in sum.types: |
| line = "isinstance = PyObject_IsInstance(obj, (PyObject*)%s_type);" |
| self.emit(line % (t.name,), 1) |
| self.emit("if (isinstance == -1) {", 1) |
| self.emit("return 1;", 2) |
| self.emit("}", 1) |
| self.emit("if (isinstance) {", 1) |
| for f in t.fields: |
| self.visitFieldDeclaration(f, t.name, sum=sum, depth=2) |
| self.emit("", 0) |
| for f in t.fields: |
| self.visitField(f, t.name, sum=sum, depth=2) |
| args = [f.name.value for f in t.fields] + [a.name.value for a in sum.attributes] |
| self.emit("*out = %s(%s);" % (t.name, self.buildArgs(args)), 2) |
| self.emit("if (*out == NULL) goto failed;", 2) |
| self.emit("return 0;", 2) |
| self.emit("}", 1) |
| self.sumTrailer(name, True) |
| |
| def visitAttributeDeclaration(self, a, name, sum=sum): |
| ctype = get_c_type(a.type) |
| self.emit("%s %s;" % (ctype, a.name), 1) |
| |
| def visitSum(self, sum, name): |
| if is_simple(sum): |
| self.simpleSum(sum, name) |
| else: |
| self.complexSum(sum, name) |
| |
| def visitProduct(self, prod, name): |
| ctype = get_c_type(name) |
| self.emit("int", 0) |
| self.emit("obj2ast_%s(PyObject* obj, %s* out, PyArena* arena)" % (name, ctype), 0) |
| self.emit("{", 0) |
| self.emit("PyObject* tmp = NULL;", 1) |
| for f in prod.fields: |
| self.visitFieldDeclaration(f, name, prod=prod, depth=1) |
| self.emit("", 0) |
| for f in prod.fields: |
| self.visitField(f, name, prod=prod, depth=1) |
| args = [f.name.value for f in prod.fields] |
| self.emit("*out = %s(%s);" % (name, self.buildArgs(args)), 1) |
| self.emit("return 0;", 1) |
| self.emit("failed:", 0) |
| self.emit("Py_XDECREF(tmp);", 1) |
| self.emit("return 1;", 1) |
| self.emit("}", 0) |
| self.emit("", 0) |
| |
| def visitFieldDeclaration(self, field, name, sum=None, prod=None, depth=0): |
| ctype = get_c_type(field.type) |
| if field.seq: |
| if self.isSimpleType(field): |
| self.emit("asdl_int_seq* %s;" % field.name, depth) |
| else: |
| self.emit("asdl_seq* %s;" % field.name, depth) |
| else: |
| ctype = get_c_type(field.type) |
| self.emit("%s %s;" % (ctype, field.name), depth) |
| |
| def isSimpleSum(self, field): |
| # XXX can the members of this list be determined automatically? |
| return field.type.value in ('expr_context', 'boolop', 'operator', |
| 'unaryop', 'cmpop') |
| |
| def isNumeric(self, field): |
| return get_c_type(field.type) in ("int", "bool") |
| |
| def isSimpleType(self, field): |
| return self.isSimpleSum(field) or self.isNumeric(field) |
| |
| def visitField(self, field, name, sum=None, prod=None, depth=0): |
| ctype = get_c_type(field.type) |
| self.emit("if (PyObject_HasAttrString(obj, \"%s\")) {" % field.name, depth) |
| self.emit("int res;", depth+1) |
| if field.seq: |
| self.emit("Py_ssize_t len;", depth+1) |
| self.emit("Py_ssize_t i;", depth+1) |
| self.emit("tmp = PyObject_GetAttrString(obj, \"%s\");" % field.name, depth+1) |
| self.emit("if (tmp == NULL) goto failed;", depth+1) |
| if field.seq: |
| self.emit("if (!PyList_Check(tmp)) {", depth+1) |
| self.emit("PyErr_Format(PyExc_TypeError, \"%s field \\\"%s\\\" must " |
| "be a list, not a %%.200s\", tmp->ob_type->tp_name);" % |
| (name, field.name), |
| depth+2, reflow=False) |
| self.emit("goto failed;", depth+2) |
| self.emit("}", depth+1) |
| self.emit("len = PyList_GET_SIZE(tmp);", depth+1) |
| if self.isSimpleType(field): |
| self.emit("%s = asdl_int_seq_new(len, arena);" % field.name, depth+1) |
| else: |
| self.emit("%s = asdl_seq_new(len, arena);" % field.name, depth+1) |
| self.emit("if (%s == NULL) goto failed;" % field.name, depth+1) |
| self.emit("for (i = 0; i < len; i++) {", depth+1) |
| self.emit("%s value;" % ctype, depth+2) |
| self.emit("res = obj2ast_%s(PyList_GET_ITEM(tmp, i), &value, arena);" % |
| field.type, depth+2, reflow=False) |
| self.emit("if (res != 0) goto failed;", depth+2) |
| self.emit("asdl_seq_SET(%s, i, value);" % field.name, depth+2) |
| self.emit("}", depth+1) |
| else: |
| self.emit("res = obj2ast_%s(tmp, &%s, arena);" % |
| (field.type, field.name), depth+1) |
| self.emit("if (res != 0) goto failed;", depth+1) |
| |
| self.emit("Py_XDECREF(tmp);", depth+1) |
| self.emit("tmp = NULL;", depth+1) |
| self.emit("} else {", depth) |
| if not field.opt: |
| message = "required field \\\"%s\\\" missing from %s" % (field.name, name) |
| format = "PyErr_SetString(PyExc_TypeError, \"%s\");" |
| self.emit(format % message, depth+1, reflow=False) |
| self.emit("return 1;", depth+1) |
| else: |
| if self.isNumeric(field): |
| self.emit("%s = 0;" % field.name, depth+1) |
| elif not self.isSimpleType(field): |
| self.emit("%s = NULL;" % field.name, depth+1) |
| else: |
| raise TypeError("could not determine the default value for %s" % field.name) |
| self.emit("}", depth) |
| |
| |
| 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 int |
| ast_type_init(PyObject *self, PyObject *args, PyObject *kw) |
| { |
| Py_ssize_t i, numfields = 0; |
| int res = -1; |
| PyObject *key, *value, *fields; |
| fields = PyObject_GetAttrString((PyObject*)Py_TYPE(self), "_fields"); |
| if (!fields) |
| PyErr_Clear(); |
| if (fields) { |
| numfields = PySequence_Size(fields); |
| if (numfields == -1) |
| goto cleanup; |
| } |
| res = 0; /* if no error occurs, this stays 0 to the end */ |
| if (PyTuple_GET_SIZE(args) > 0) { |
| if (numfields != PyTuple_GET_SIZE(args)) { |
| PyErr_Format(PyExc_TypeError, "%.400s constructor takes %s" |
| "%zd positional argument%s", |
| Py_TYPE(self)->tp_name, |
| numfields == 0 ? "" : "either 0 or ", |
| numfields, numfields == 1 ? "" : "s"); |
| res = -1; |
| goto cleanup; |
| } |
| for (i = 0; i < PyTuple_GET_SIZE(args); i++) { |
| /* cannot be reached when fields is NULL */ |
| PyObject *name = PySequence_GetItem(fields, i); |
| if (!name) { |
| res = -1; |
| goto cleanup; |
| } |
| res = PyObject_SetAttr(self, name, PyTuple_GET_ITEM(args, i)); |
| Py_DECREF(name); |
| if (res < 0) |
| goto cleanup; |
| } |
| } |
| if (kw) { |
| i = 0; /* needed by PyDict_Next */ |
| while (PyDict_Next(kw, &i, &key, &value)) { |
| res = PyObject_SetAttr(self, key, value); |
| if (res < 0) |
| goto cleanup; |
| } |
| } |
| cleanup: |
| Py_XDECREF(fields); |
| return res; |
| } |
| |
| /* Pickling support */ |
| static PyObject * |
| ast_type_reduce(PyObject *self, PyObject *unused) |
| { |
| PyObject *res; |
| PyObject *dict = PyObject_GetAttrString(self, "__dict__"); |
| if (dict == NULL) { |
| if (PyErr_ExceptionMatches(PyExc_AttributeError)) |
| PyErr_Clear(); |
| else |
| return NULL; |
| } |
| if (dict) { |
| res = Py_BuildValue("O()O", Py_TYPE(self), dict); |
| Py_DECREF(dict); |
| return res; |
| } |
| return Py_BuildValue("O()", Py_TYPE(self)); |
| } |
| |
| static PyMethodDef ast_type_methods[] = { |
| {"__reduce__", ast_type_reduce, METH_NOARGS, NULL}, |
| {NULL} |
| }; |
| |
| static PyTypeObject AST_type = { |
| PyVarObject_HEAD_INIT(&PyType_Type, 0) |
| "_ast.AST", |
| sizeof(PyObject), |
| 0, |
| 0, /* tp_dealloc */ |
| 0, /* tp_print */ |
| 0, /* tp_getattr */ |
| 0, /* tp_setattr */ |
| 0, /* tp_reserved */ |
| 0, /* tp_repr */ |
| 0, /* tp_as_number */ |
| 0, /* tp_as_sequence */ |
| 0, /* tp_as_mapping */ |
| 0, /* tp_hash */ |
| 0, /* tp_call */ |
| 0, /* tp_str */ |
| PyObject_GenericGetAttr, /* tp_getattro */ |
| PyObject_GenericSetAttr, /* tp_setattro */ |
| 0, /* tp_as_buffer */ |
| Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE, /* tp_flags */ |
| 0, /* tp_doc */ |
| 0, /* tp_traverse */ |
| 0, /* tp_clear */ |
| 0, /* tp_richcompare */ |
| 0, /* tp_weaklistoffset */ |
| 0, /* tp_iter */ |
| 0, /* tp_iternext */ |
| ast_type_methods, /* tp_methods */ |
| 0, /* tp_members */ |
| 0, /* tp_getset */ |
| 0, /* tp_base */ |
| 0, /* tp_dict */ |
| 0, /* tp_descr_get */ |
| 0, /* tp_descr_set */ |
| 0, /* tp_dictoffset */ |
| (initproc)ast_type_init, /* tp_init */ |
| PyType_GenericAlloc, /* tp_alloc */ |
| PyType_GenericNew, /* tp_new */ |
| PyObject_Del, /* tp_free */ |
| }; |
| |
| |
| static PyTypeObject* make_type(char *type, PyTypeObject* base, char**fields, int num_fields) |
| { |
| PyObject *fnames, *result; |
| int i; |
| fnames = PyTuple_New(num_fields); |
| if (!fnames) return NULL; |
| for (i = 0; i < num_fields; i++) { |
| PyObject *field = PyUnicode_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 = PyTuple_New(num_fields); |
| if (!l) |
| return 0; |
| for (i = 0; i < num_fields; i++) { |
| s = PyUnicode_FromString(attrs[i]); |
| if (!s) { |
| Py_DECREF(l); |
| return 0; |
| } |
| PyTuple_SET_ITEM(l, i, s); |
| } |
| result = PyObject_SetAttrString((PyObject*)type, "_attributes", l) >= 0; |
| Py_DECREF(l); |
| return result; |
| } |
| |
| /* Conversion AST -> Python */ |
| |
| 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_int(long b) |
| { |
| return PyLong_FromLong(b); |
| } |
| |
| /* Conversion Python -> AST */ |
| |
| static int obj2ast_object(PyObject* obj, PyObject** out, PyArena* arena) |
| { |
| if (obj == Py_None) |
| obj = NULL; |
| if (obj) |
| PyArena_AddPyObject(arena, obj); |
| Py_XINCREF(obj); |
| *out = obj; |
| return 0; |
| } |
| |
| #define obj2ast_identifier obj2ast_object |
| #define obj2ast_string obj2ast_object |
| |
| static int obj2ast_int(PyObject* obj, int* out, PyArena* arena) |
| { |
| int i; |
| if (!PyLong_Check(obj)) { |
| PyObject *s = PyObject_Repr(obj); |
| if (s == NULL) return 1; |
| PyErr_Format(PyExc_ValueError, "invalid integer value: %.400s", |
| PyBytes_AS_STRING(s)); |
| Py_DECREF(s); |
| return 1; |
| } |
| |
| i = (int)PyLong_AsLong(obj); |
| if (i == -1 && PyErr_Occurred()) |
| return 1; |
| *out = i; |
| return 0; |
| } |
| |
| static int add_ast_fields(void) |
| { |
| PyObject *empty_tuple, *d; |
| if (PyType_Ready(&AST_type) < 0) |
| return -1; |
| d = AST_type.tp_dict; |
| empty_tuple = PyTuple_New(0); |
| if (!empty_tuple || |
| PyDict_SetItemString(d, "_fields", empty_tuple) < 0 || |
| PyDict_SetItemString(d, "_attributes", empty_tuple) < 0) { |
| Py_XDECREF(empty_tuple); |
| return -1; |
| } |
| Py_DECREF(empty_tuple); |
| return 0; |
| } |
| |
| """, 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("if (add_ast_fields() < 0) return 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("static struct PyModuleDef _astmodule = {", 0) |
| self.emit(' PyModuleDef_HEAD_INIT, "_ast"', 0) |
| self.emit("};", 0) |
| self.emit("PyMODINIT_FUNC", 0) |
| self.emit("PyInit__ast(void)", 0) |
| self.emit("{", 0) |
| self.emit("PyObject *m, *d;", 1) |
| self.emit("if (!init_types()) return NULL;", 1) |
| self.emit('m = PyModule_Create(&_astmodule);', 1) |
| self.emit("if (!m) return NULL;", 1) |
| self.emit("d = PyModule_GetDict(m);", 1) |
| self.emit('if (PyDict_SetItemString(d, "AST", (PyObject*)&AST_type) < 0) return NULL;', 1) |
| self.emit('if (PyModule_AddIntConstant(m, "PyCF_ONLY_AST", PyCF_ONLY_AST) < 0)', 1) |
| self.emit("return NULL;", 2) |
| # Value of version: "$Revision$" |
| self.emit('if (PyModule_AddStringConstant(m, "__version__", "%s") < 0)' |
| % (mod.version,), 1) |
| self.emit("return NULL;", 2) |
| for dfn in mod.dfns: |
| self.visit(dfn) |
| self.emit("return m;", 1) |
| 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 NULL;' % (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("default:" % name, 2) |
| self.emit('/* should never happen, but just in case ... */', 3) |
| code = "PyErr_Format(PyExc_SystemError, \"unknown %s found\");" % name |
| self.emit(code, 3, reflow=False) |
| self.emit("return NULL;", 3) |
| self.emit("}", 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); |
| } |
| |
| /* mode is 0 for "exec", 1 for "eval" and 2 for "single" input */ |
| mod_ty PyAST_obj2mod(PyObject* ast, PyArena* arena, int mode) |
| { |
| mod_ty res; |
| PyObject *req_type[] = {(PyObject*)Module_type, (PyObject*)Expression_type, |
| (PyObject*)Interactive_type}; |
| char *req_name[] = {"Module", "Expression", "Interactive"}; |
| int isinstance; |
| assert(0 <= mode && mode <= 2); |
| |
| init_types(); |
| |
| isinstance = PyObject_IsInstance(ast, req_type[mode]); |
| if (isinstance == -1) |
| return NULL; |
| if (!isinstance) { |
| PyErr_Format(PyExc_TypeError, "expected %s node, got %.400s", |
| req_name[mode], Py_TYPE(ast)->tp_name); |
| return NULL; |
| } |
| if (obj2ast_mod(ast, &res, arena) != 0) |
| return NULL; |
| else |
| return res; |
| } |
| |
| int PyAST_Check(PyObject* obj) |
| { |
| init_types(); |
| return PyObject_IsInstance(obj, (PyObject*)&AST_type); |
| } |
| """ |
| |
| class ChainOfVisitors: |
| def __init__(self, *visitors): |
| self.visitors = visitors |
| |
| def visit(self, object): |
| for v in self.visitors: |
| v.visit(object) |
| v.emit("", 0) |
| |
| common_msg = "/* File automatically generated by %s. */\n\n" |
| |
| c_file_msg = """ |
| /* |
| __version__ %s. |
| |
| This module must be committed separately after each AST grammar change; |
| The __version__ number is set to the revision number of the commit |
| containing the grammar change. |
| */ |
| |
| """ |
| |
| |
| def get_file_revision(f): |
| """Fish out the last change to a file in hg.""" |
| args = ["hg", "log", "--template", "{node|short}", "--limit", "1", f] |
| p = subprocess.Popen(args, stdout=subprocess.PIPE) |
| out = p.communicate()[0] |
| if p.returncode: |
| print >> sys.stderr, "error return code from hg" |
| sys.exit(1) |
| return out |
| |
| |
| def main(srcfile): |
| argv0 = sys.argv[0] |
| components = argv0.split(os.sep) |
| argv0 = os.sep.join(components[-2:]) |
| auto_gen_msg = common_msg % argv0 |
| mod = asdl.parse(srcfile) |
| if not asdl.check(mod): |
| sys.exit(1) |
| mod.version = get_file_revision(srcfile) |
| if INC_DIR: |
| p = "%s/%s-ast.h" % (INC_DIR, mod.name) |
| f = open(p, "w") |
| f.write(auto_gen_msg) |
| f.write('#include "asdl.h"\n\n') |
| c = ChainOfVisitors(TypeDefVisitor(f), |
| StructVisitor(f), |
| PrototypeVisitor(f), |
| ) |
| c.visit(mod) |
| f.write("PyObject* PyAST_mod2obj(mod_ty t);\n") |
| f.write("mod_ty PyAST_obj2mod(PyObject* ast, PyArena* arena, int mode);\n") |
| f.write("int PyAST_Check(PyObject* obj);\n") |
| f.close() |
| |
| if SRC_DIR: |
| p = os.path.join(SRC_DIR, str(mod.name) + "-ast.c") |
| f = open(p, "w") |
| f.write(auto_gen_msg) |
| f.write(c_file_msg % (mod.version,)) |
| f.write('#include "Python.h"\n') |
| f.write('#include "%s-ast.h"\n' % mod.name) |
| f.write('\n') |
| f.write("static PyTypeObject AST_type;\n") |
| v = ChainOfVisitors( |
| PyTypesDeclareVisitor(f), |
| PyTypesVisitor(f), |
| Obj2ModPrototypeVisitor(f), |
| FunctionVisitor(f), |
| ObjVisitor(f), |
| Obj2ModVisitor(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: |
| sys.stdout.write("Must specify exactly one output file\n") |
| sys.exit(1) |
| for o, v in opts: |
| if o == '-h': |
| INC_DIR = v |
| if o == '-c': |
| SRC_DIR = v |
| if len(args) != 1: |
| sys.stdout.write("Must specify single input file\n") |
| sys.exit(1) |
| main(args[0]) |