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Copy pathasdl_c.py
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executable file
·2496 lines (2215 loc) · 80.7 KB
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#! /usr/bin/env python
"""Generate C code from an ASDL description."""
import sys
import textwrap
import types
from argparse import ArgumentParser
from contextlib import contextmanager
from pathlib import Path
import asdl
TABSIZE = 4
MAX_COL = 80
AUTOGEN_MESSAGE = "// File automatically generated by {}.\n\n"
builtin_type_to_c_type = {
"identifier": "PyUnicode_Type",
"string": "PyUnicode_Type",
"int": "PyLong_Type",
"constant": "PyBaseObject_Type",
}
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.
"""
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 reflow_c_string(s, depth):
return '"%s"' % s.replace('\n', '\\n"\n%s"' % (' ' * depth * TABSIZE))
def is_simple(sum_type):
"""Return True if a sum is a simple.
A sum is simple if its types have no fields and itself
doesn't have any attributes. Instances of these types are
cached at C level, and they act like singletons when propagating
parser generated nodes into Python level, e.g.
unaryop = Invert | Not | UAdd | USub
"""
return not (
sum_type.attributes or
any(constructor.fields for constructor in sum_type.types)
)
def asdl_of(name, obj):
if isinstance(obj, asdl.Product) or isinstance(obj, asdl.Constructor):
fields = ", ".join(map(str, obj.fields))
if fields:
fields = "({})".format(fields)
return "{}{}".format(name, fields)
else:
if is_simple(obj):
types = " | ".join(type.name for type in obj.types)
else:
sep = "\n{}| ".format(" " * (len(name) + 1))
types = sep.join(
asdl_of(type.name, type) for type in obj.types
)
return "{} = {}".format(name, types)
class EmitVisitor(asdl.VisitorBase):
"""Visit that emits lines"""
def __init__(self, file, metadata = None):
self.file = file
self._metadata = metadata
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:
if line:
line = (" " * TABSIZE * depth) + line
self.file.write(line + "\n")
@property
def metadata(self):
if self._metadata is None:
raise ValueError(
"%s was expecting to be annotated with metadata"
% type(self).__name__
)
return self._metadata
@metadata.setter
def metadata(self, value):
self._metadata = value
class MetadataVisitor(asdl.VisitorBase):
ROOT_TYPE = "AST"
def __init__(self, *args, **kwargs):
super().__init__(*args, **kwargs)
# Metadata:
# - simple_sums: Tracks the list of compound type
# names where all the constructors
# belonging to that type lack of any
# fields.
# - identifiers: All identifiers used in the AST declarations
# - singletons: List of all constructors that originates from
# simple sums.
# - types: List of all top level type names
#
self.metadata = types.SimpleNamespace(
simple_sums=set(),
identifiers=set(),
singletons=set(),
types={self.ROOT_TYPE},
)
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):
self.metadata.types.add(name)
simple_sum = is_simple(sum)
if simple_sum:
self.metadata.simple_sums.add(name)
for constructor in sum.types:
if simple_sum:
self.metadata.singletons.add(constructor.name)
self.visitConstructor(constructor)
self.visitFields(sum.attributes)
def visitConstructor(self, constructor):
self.metadata.types.add(constructor.name)
self.visitFields(constructor.fields)
def visitProduct(self, product, name):
self.metadata.types.add(name)
self.visitFields(product.attributes)
self.visitFields(product.fields)
def visitFields(self, fields):
for field in fields:
self.visitField(field)
def visitField(self, field):
self.metadata.identifiers.add(field.name)
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 SequenceDefVisitor(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):
return
self.emit_sequence_constructor(name, depth)
def emit_sequence_constructor(self, name,depth):
ctype = get_c_type(name)
self.emit("""\
typedef struct {
_ASDL_SEQ_HEAD
%(ctype)s typed_elements[1];
} asdl_%(name)s_seq;""" % locals(), reflow=False, depth=depth)
self.emit("", depth)
self.emit("asdl_%(name)s_seq *_Py_asdl_%(name)s_seq_new(Py_ssize_t size, PyArena *arena);" % locals(), depth)
self.emit("", depth)
def visitProduct(self, product, name, depth):
self.emit_sequence_constructor(name, depth)
class StructVisitor(EmitVisitor):
"""Visitor to generate typedefs 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)
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 in self.metadata.simple_sums:
self.emit("asdl_int_seq *%(name)s;" % locals(), depth)
else:
_type = field.type
self.emit("asdl_%(_type)s_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)
for field in product.attributes:
# rudimentary attribute handling
type = str(field.type)
assert type in asdl.builtin_types, type
self.emit("%s %s;" % (type, field.name), depth + 1);
self.emit("};", depth)
self.emit("", depth)
def ast_func_name(name):
return f"_PyAST_{name}"
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 info, 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 in self.metadata.simple_sums:
ctype = "asdl_int_seq *"
else:
ctype = f"asdl_{f.type}_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"
self.emit("%s %s(%s);" % (ctype, ast_func_name(name), argstr), False)
def visitProduct(self, prod, name):
self.emit_function(name, get_c_type(name),
self.get_args(prod.fields),
self.get_args(prod.attributes),
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)" % (ast_func_name(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)
for argtype, argname, opt in attrs:
emit("p->%s = %s;" % (argname, argname), 1)
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(struct ast_state *state, PyObject* obj, %s* out, const char* field, PyArena* arena);"
self.emit(code % (name, get_c_type(name)), 0)
visitSum = visitProduct
class Obj2ModVisitor(PickleVisitor):
attribute_special_defaults = {
"end_lineno": "lineno",
"end_col_offset": "col_offset",
}
@contextmanager
def recursive_call(self, node, level):
self.emit('if (_Py_EnterRecursiveCall(" while traversing \'%s\' node")) {' % node, level, reflow=False)
self.emit('goto failed;', level + 1)
self.emit('}', level)
yield
self.emit('_Py_LeaveRecursiveCall();', level)
def funcHeader(self, name):
ctype = get_c_type(name)
self.emit("int", 0)
self.emit("obj2ast_%s(struct ast_state *state, PyObject* obj, %s* out, const char* field, 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, "
"state->%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 typeCheck(self, name):
self.emit("tp = state->%s_type;" % name, 1)
self.emit("isinstance = PyObject_IsInstance(obj, tp);", 1)
self.emit("if (isinstance == -1) {", 1)
self.emit("return 1;", 2)
self.emit("}", 1)
self.emit("if (!isinstance && field != NULL) {", 1)
error = "field '%%s' was expecting node of type '%s', got '%%T'" % name
self.emit("PyErr_Format(PyExc_TypeError, \"%s\", field, obj);" % error, 2, reflow=False)
self.emit("return 1;", 2)
self.emit("}", 1)
def complexSum(self, sum, name):
self.funcHeader(name)
self.emit("PyObject *tmp = NULL;", 1)
self.emit("PyObject *tp;", 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)
self.typeCheck(name)
for a in sum.attributes:
self.visitField(a, name, sum=sum, depth=1)
for t in sum.types:
self.emit("tp = state->%s_type;" % (t.name,), 1)
self.emit("isinstance = PyObject_IsInstance(obj, tp);", 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 for f in t.fields] + [a.name for a in sum.attributes]
self.emit("*out = %s(%s);" % (ast_func_name(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(struct ast_state *state, PyObject* obj, %s* out, const char* field, 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)
for a in prod.attributes:
self.visitFieldDeclaration(a, name, prod=prod, depth=1)
self.emit("", 0)
for f in prod.fields:
self.visitField(f, name, prod=prod, depth=1)
for a in prod.attributes:
self.visitField(a, name, prod=prod, depth=1)
args = [f.name for f in prod.fields]
args.extend([a.name for a in prod.attributes])
self.emit("*out = %s(%s);" % (ast_func_name(name), self.buildArgs(args)), 1)
self.emit("if (*out == NULL) goto failed;", 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:
_type = field.type
self.emit(f"asdl_{field.type}_seq* {field.name};", depth)
else:
ctype = get_c_type(field.type)
self.emit("%s %s;" % (ctype, field.name), depth)
def isNumeric(self, field):
return get_c_type(field.type) in ("int", "bool")
def isSimpleType(self, field):
return field.type in self.metadata.simple_sums or self.isNumeric(field)
def visitField(self, field, name, sum=None, prod=None, depth=0):
ctype = get_c_type(field.type)
line = "if (PyObject_GetOptionalAttr(obj, state->%s, &tmp) < 0) {"
self.emit(line % field.name, depth)
self.emit("return -1;", depth+1)
self.emit("}", depth)
if field.seq:
self.emit("if (tmp == NULL) {", depth)
self.emit("tmp = PyList_New(0);", depth+1)
self.emit("if (tmp == NULL) {", depth+1)
self.emit("return -1;", depth+2)
self.emit("}", depth+1)
self.emit("}", depth)
self.emit("{", depth)
else:
if not field.opt:
self.emit("if (tmp == NULL) {", depth)
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:
self.emit("if (tmp == NULL || tmp == Py_None) {", depth)
self.emit("Py_CLEAR(tmp);", depth+1)
if self.isNumeric(field):
if field.name in self.attribute_special_defaults:
self.emit(
"%s = %s;" % (field.name, self.attribute_special_defaults[field.name]),
depth+1,
)
else:
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)
self.emit("else {", 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("if (!PyList_Check(tmp)) {", depth+1)
self.emit("PyErr_Format(PyExc_TypeError, \"%s field \\\"%s\\\" must "
"be a list, not a %%T\", tmp);" %
(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 = _Py_asdl_int_seq_new(len, arena);" % field.name, depth+1)
else:
self.emit("%s = _Py_asdl_%s_seq_new(len, arena);" % (field.name, field.type), 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 val;" % ctype, depth+2)
self.emit("PyObject *tmp2 = Py_NewRef(PyList_GET_ITEM(tmp, i));", depth+2)
with self.recursive_call(name, depth+2):
self.emit("res = obj2ast_%s(state, tmp2, &val, \"%s\", arena);" %
(field.type, field.name), depth+2, reflow=False)
self.emit("Py_DECREF(tmp2);", depth+2)
self.emit("if (res != 0) goto failed;", depth+2)
self.emit("if (len != PyList_GET_SIZE(tmp)) {", depth+2)
self.emit("PyErr_SetString(PyExc_RuntimeError, \"%s field \\\"%s\\\" "
"changed size during iteration\");" %
(name, field.name),
depth+3, reflow=False)
self.emit("goto failed;", depth+3)
self.emit("}", depth+2)
self.emit("asdl_seq_SET(%s, i, val);" % field.name, depth+2)
self.emit("}", depth+1)
else:
with self.recursive_call(name, depth+1):
self.emit("res = obj2ast_%s(state, tmp, &%s, \"%s\", arena);" %
(field.type, field.name, field.name), depth+1)
self.emit("if (res != 0) goto failed;", depth+1)
self.emit("Py_CLEAR(tmp);", depth+1)
self.emit("}", depth)
class SequenceConstructorVisitor(EmitVisitor):
def visitModule(self, mod):
for dfn in mod.dfns:
self.visit(dfn)
def visitType(self, type):
self.visit(type.value, type.name)
def visitProduct(self, prod, name):
self.emit_sequence_constructor(name, get_c_type(name))
def visitSum(self, sum, name):
if not is_simple(sum):
self.emit_sequence_constructor(name, get_c_type(name))
def emit_sequence_constructor(self, name, type):
self.emit(f"GENERATE_ASDL_SEQ_CONSTRUCTOR({name}, {type})", depth=0)
class PyTypesDeclareVisitor(PickleVisitor):
def visitProduct(self, prod, name):
self.emit("static PyObject* ast2obj_%s(struct ast_state *state, void*);" % name, 0)
if prod.attributes:
self.emit("static const char * const %s_attributes[] = {" % name, 0)
for a in prod.attributes:
self.emit('"%s",' % a.name, 1)
self.emit("};", 0)
if prod.fields:
self.emit("static const char * const %s_fields[]={" % name,0)
for f in prod.fields:
self.emit('"%s",' % f.name, 1)
self.emit("};", 0)
def visitSum(self, sum, name):
if sum.attributes:
self.emit("static const char * const %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)
self.emit("static PyObject* ast2obj_%s(struct ast_state *state, %s);" % (name, ptype), 0)
for t in sum.types:
self.visitConstructor(t, name)
def visitConstructor(self, cons, name):
if cons.fields:
self.emit("static const char * const %s_fields[]={" % cons.name, 0)
for t in cons.fields:
self.emit('"%s",' % t.name, 1)
self.emit("};",0)
class AnnotationsVisitor(PickleVisitor):
def visitModule(self, mod):
self.nodes = []
for dfn in mod.dfns:
self.visit(dfn)
builtins = list(dict.fromkeys(builtin_type_to_c_type.values()))
self.file.write(textwrap.dedent('''
static int
add_ast_annotations(struct ast_state *state)
{
enum {
FIELD_OPTIONAL = 1,
FIELD_SEQUENCE = 2,
FIELD_BUILTIN = 4,
};
PyTypeObject *const builtin_types[] = {
'''))
for c_type in builtins:
self.emit(f"&{c_type},", 2)
self.file.write(textwrap.dedent('''\
};
// Offsets refer to this interpreter's AST state, not global types.
static_assert(sizeof(struct ast_state) <= UINT16_MAX,
"ast_state offsets must fit in uint16_t");
static const struct {
uint16_t name_offset;
uint16_t type_offset; // An index into builtin_types for builtins.
uint8_t flags;
} fields[] = {
#''').removesuffix('#')) # Use d-string if it accepted.
for name, fields in self.nodes:
for field in fields:
flags = []
if field.opt:
flags.append("FIELD_OPTIONAL")
elif field.seq:
flags.append("FIELD_SEQUENCE")
if field.type in builtin_type_to_c_type:
c_type = builtin_type_to_c_type[field.type]
type_offset = str(builtins.index(c_type))
flags.append("FIELD_BUILTIN")
else:
type_offset = f"offsetof(struct ast_state, {field.type}_type)"
flags = " | ".join(flags) or "0"
self.emit(f"{{offsetof(struct ast_state, {field.name}),", 2)
self.emit(f" {type_offset}, {flags}}},", 2)
self.file.write(textwrap.dedent('''\
};
static const struct {
uint16_t type_offset;
uint16_t first_field;
uint16_t nfields;
} nodes[] = {
#''').removesuffix('#'))
start = 0
for name, fields in self.nodes:
self.emit(f"{{offsetof(struct ast_state, {name}_type), "
f"{start}, {len(fields)}}},", 2)
start += len(fields)
self.file.write(textwrap.dedent('''\
};
char *base = (char *)state;
PyObject *annotations = NULL;
for (size_t i = 0; i < Py_ARRAY_LENGTH(nodes); i++) {
annotations = PyDict_New();
if (annotations == NULL) {
goto error;
}
size_t end = nodes[i].first_field + nodes[i].nfields;
for (size_t j = nodes[i].first_field; j < end; j++) {
PyObject *name = *(PyObject **)(base + fields[j].name_offset);
PyObject *type;
if (fields[j].flags & FIELD_BUILTIN) {
type = (PyObject *)builtin_types[fields[j].type_offset];
}
else {
type = *(PyObject **)(base + fields[j].type_offset);
}
if (fields[j].flags & FIELD_OPTIONAL) {
type = _Py_union_type_or(type, Py_None);
}
else if (fields[j].flags & FIELD_SEQUENCE) {
type = Py_GenericAlias((PyObject *)&PyList_Type, type);
}
else {
Py_INCREF(type);
}
if (type == NULL) {
goto error;
}
int res = PyDict_SetItem(annotations, name, type);
Py_DECREF(type);
if (res < 0) {
goto error;
}
}
PyObject *node = *(PyObject **)(base + nodes[i].type_offset);
if (PyObject_SetAttrString(node, "_field_types", annotations) < 0 ||
PyObject_SetAttrString(node, "__annotations__", annotations) < 0)
{
goto error;
}
Py_CLEAR(annotations);
}
return 1;
error:
Py_XDECREF(annotations);
return 0;
}
'''))
def visitProduct(self, prod, name):
self.nodes.append((name, prod.fields))
def visitSum(self, sum, name):
for t in sum.types:
self.visitConstructor(t, name)
def visitConstructor(self, cons, name):
self.nodes.append((cons.name, cons.fields))
class PyTypesVisitor(PickleVisitor):
def visitModule(self, mod):
self.emit("""
typedef struct {
PyObject_HEAD
PyObject *dict;
} AST_object;
static void
ast_dealloc(PyObject *op)
{
AST_object *self = (AST_object*)op;
/* bpo-31095: UnTrack is needed before calling any callbacks */
PyTypeObject *tp = Py_TYPE(self);
PyObject_GC_UnTrack(self);
Py_CLEAR(self->dict);
freefunc free_func = PyType_GetSlot(tp, Py_tp_free);
assert(free_func != NULL);
free_func(self);
Py_DECREF(tp);
}
static int
ast_traverse(PyObject *op, visitproc visit, void *arg)
{
AST_object *self = (AST_object*)op;
Py_VISIT(Py_TYPE(self));
Py_VISIT(self->dict);
return 0;
}
static int
ast_clear(PyObject *op)
{
AST_object *self = (AST_object*)op;
Py_CLEAR(self->dict);
return 0;
}
/*
* Format the names in the set 'missing' into a natural language list,
* sorted in the order in which they appear in 'fields'.
*
* Similar to format_missing() from 'Python/ceval.c'.
*
* Parameters
*
* missing Set of missing field names to render.
* fields Sequence of AST node field names (self._fields).
*/
static PyObject *
format_missing(PyObject *missing, PyObject *fields)
{
Py_ssize_t num_fields, num_total, num_left;
num_fields = PySequence_Size(fields);
if (num_fields == -1) {
return NULL;
}
num_total = num_left = PySet_GET_SIZE(missing);
PyUnicodeWriter *writer = PyUnicodeWriter_Create(0);
if (writer == NULL) {
goto error;
}
// Iterate all AST node fields in order so that the missing positional
// arguments are rendered in the order in which __init__ expects them.
for (Py_ssize_t i = 0; i < num_fields; i++) {
PyObject *name = PySequence_GetItem(fields, i);
if (name == NULL) {
goto error;
}
int contains = PySet_Contains(missing, name);
if (contains == -1) {
Py_DECREF(name);
goto error;
}
else if (contains == 1) {
const char* fmt = NULL;
if (num_left == 1) {
fmt = "'%U'";
}
else if (num_total == 2) {
fmt = "'%U' and ";
}
else if (num_left == 2) {
fmt = "'%U', and ";
}
else {
fmt = "'%U', ";
}
num_left--;