mirror of
https://github.com/python/cpython.git
synced 2024-11-25 09:39:56 +01:00
2236 lines
75 KiB
Python
Executable File
2236 lines
75 KiB
Python
Executable File
#! /usr/bin/env python
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"""Generate C code from an ASDL description."""
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import sys
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import textwrap
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import types
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from argparse import ArgumentParser
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from contextlib import contextmanager
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from pathlib import Path
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import asdl
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TABSIZE = 4
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MAX_COL = 80
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AUTOGEN_MESSAGE = "// File automatically generated by {}.\n\n"
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builtin_type_to_c_type = {
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"identifier": "PyUnicode_Type",
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"string": "PyUnicode_Type",
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"int": "PyLong_Type",
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"constant": "PyBaseObject_Type",
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}
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def get_c_type(name):
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"""Return a string for the C name of the type.
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This function special cases the default types provided by asdl.
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"""
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if name in asdl.builtin_types:
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return name
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else:
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return "%s_ty" % name
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def reflow_lines(s, depth):
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"""Reflow the line s indented depth tabs.
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Return a sequence of lines where no line extends beyond MAX_COL
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when properly indented. The first line is properly indented based
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exclusively on depth * TABSIZE. All following lines -- these are
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the reflowed lines generated by this function -- start at the same
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column as the first character beyond the opening { in the first
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line.
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"""
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size = MAX_COL - depth * TABSIZE
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if len(s) < size:
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return [s]
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lines = []
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cur = s
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padding = ""
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while len(cur) > size:
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i = cur.rfind(' ', 0, size)
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# XXX this should be fixed for real
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if i == -1 and 'GeneratorExp' in cur:
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i = size + 3
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assert i != -1, "Impossible line %d to reflow: %r" % (size, s)
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lines.append(padding + cur[:i])
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if len(lines) == 1:
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# find new size based on brace
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j = cur.find('{', 0, i)
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if j >= 0:
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j += 2 # account for the brace and the space after it
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size -= j
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padding = " " * j
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else:
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j = cur.find('(', 0, i)
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if j >= 0:
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j += 1 # account for the paren (no space after it)
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size -= j
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padding = " " * j
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cur = cur[i+1:]
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else:
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lines.append(padding + cur)
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return lines
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def reflow_c_string(s, depth):
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return '"%s"' % s.replace('\n', '\\n"\n%s"' % (' ' * depth * TABSIZE))
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def is_simple(sum_type):
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"""Return True if a sum is a simple.
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A sum is simple if its types have no fields and itself
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doesn't have any attributes. Instances of these types are
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cached at C level, and they act like singletons when propagating
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parser generated nodes into Python level, e.g.
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unaryop = Invert | Not | UAdd | USub
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"""
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return not (
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sum_type.attributes or
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any(constructor.fields for constructor in sum_type.types)
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)
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def asdl_of(name, obj):
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if isinstance(obj, asdl.Product) or isinstance(obj, asdl.Constructor):
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fields = ", ".join(map(str, obj.fields))
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if fields:
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fields = "({})".format(fields)
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return "{}{}".format(name, fields)
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else:
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if is_simple(obj):
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types = " | ".join(type.name for type in obj.types)
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else:
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sep = "\n{}| ".format(" " * (len(name) + 1))
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types = sep.join(
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asdl_of(type.name, type) for type in obj.types
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)
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return "{} = {}".format(name, types)
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class EmitVisitor(asdl.VisitorBase):
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"""Visit that emits lines"""
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def __init__(self, file, metadata = None):
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self.file = file
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self._metadata = metadata
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super(EmitVisitor, self).__init__()
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def emit(self, s, depth, reflow=True):
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# XXX reflow long lines?
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if reflow:
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lines = reflow_lines(s, depth)
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else:
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lines = [s]
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for line in lines:
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if line:
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line = (" " * TABSIZE * depth) + line
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self.file.write(line + "\n")
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@property
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def metadata(self):
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if self._metadata is None:
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raise ValueError(
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"%s was expecting to be annotated with metadata"
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% type(self).__name__
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)
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return self._metadata
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@metadata.setter
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def metadata(self, value):
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self._metadata = value
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class MetadataVisitor(asdl.VisitorBase):
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ROOT_TYPE = "AST"
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def __init__(self, *args, **kwargs):
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super().__init__(*args, **kwargs)
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# Metadata:
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# - simple_sums: Tracks the list of compound type
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# names where all the constructors
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# belonging to that type lack of any
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# fields.
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# - identifiers: All identifiers used in the AST declarations
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# - singletons: List of all constructors that originates from
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# simple sums.
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# - types: List of all top level type names
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#
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self.metadata = types.SimpleNamespace(
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simple_sums=set(),
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identifiers=set(),
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singletons=set(),
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types={self.ROOT_TYPE},
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)
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def visitModule(self, mod):
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for dfn in mod.dfns:
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self.visit(dfn)
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def visitType(self, type):
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self.visit(type.value, type.name)
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def visitSum(self, sum, name):
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self.metadata.types.add(name)
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simple_sum = is_simple(sum)
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if simple_sum:
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self.metadata.simple_sums.add(name)
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for constructor in sum.types:
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if simple_sum:
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self.metadata.singletons.add(constructor.name)
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self.visitConstructor(constructor)
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self.visitFields(sum.attributes)
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def visitConstructor(self, constructor):
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self.metadata.types.add(constructor.name)
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self.visitFields(constructor.fields)
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def visitProduct(self, product, name):
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self.metadata.types.add(name)
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self.visitFields(product.attributes)
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self.visitFields(product.fields)
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def visitFields(self, fields):
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for field in fields:
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self.visitField(field)
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def visitField(self, field):
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self.metadata.identifiers.add(field.name)
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class TypeDefVisitor(EmitVisitor):
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def visitModule(self, mod):
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for dfn in mod.dfns:
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self.visit(dfn)
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def visitType(self, type, depth=0):
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self.visit(type.value, type.name, depth)
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def visitSum(self, sum, name, depth):
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if is_simple(sum):
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self.simple_sum(sum, name, depth)
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else:
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self.sum_with_constructors(sum, name, depth)
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def simple_sum(self, sum, name, depth):
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enum = []
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for i in range(len(sum.types)):
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type = sum.types[i]
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enum.append("%s=%d" % (type.name, i + 1))
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enums = ", ".join(enum)
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ctype = get_c_type(name)
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s = "typedef enum _%s { %s } %s;" % (name, enums, ctype)
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self.emit(s, depth)
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self.emit("", depth)
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def sum_with_constructors(self, sum, name, depth):
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ctype = get_c_type(name)
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s = "typedef struct _%(name)s *%(ctype)s;" % locals()
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self.emit(s, depth)
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self.emit("", depth)
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def visitProduct(self, product, name, depth):
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ctype = get_c_type(name)
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s = "typedef struct _%(name)s *%(ctype)s;" % locals()
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self.emit(s, depth)
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self.emit("", depth)
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class SequenceDefVisitor(EmitVisitor):
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def visitModule(self, mod):
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for dfn in mod.dfns:
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self.visit(dfn)
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def visitType(self, type, depth=0):
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self.visit(type.value, type.name, depth)
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def visitSum(self, sum, name, depth):
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if is_simple(sum):
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return
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self.emit_sequence_constructor(name, depth)
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def emit_sequence_constructor(self, name,depth):
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ctype = get_c_type(name)
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self.emit("""\
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typedef struct {
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_ASDL_SEQ_HEAD
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%(ctype)s typed_elements[1];
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} asdl_%(name)s_seq;""" % locals(), reflow=False, depth=depth)
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self.emit("", depth)
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self.emit("asdl_%(name)s_seq *_Py_asdl_%(name)s_seq_new(Py_ssize_t size, PyArena *arena);" % locals(), depth)
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self.emit("", depth)
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def visitProduct(self, product, name, depth):
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self.emit_sequence_constructor(name, depth)
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class StructVisitor(EmitVisitor):
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"""Visitor to generate typedefs for AST."""
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def visitModule(self, mod):
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for dfn in mod.dfns:
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self.visit(dfn)
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def visitType(self, type, depth=0):
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self.visit(type.value, type.name, depth)
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def visitSum(self, sum, name, depth):
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if not is_simple(sum):
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self.sum_with_constructors(sum, name, depth)
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def sum_with_constructors(self, sum, name, depth):
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def emit(s, depth=depth):
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self.emit(s % sys._getframe(1).f_locals, depth)
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enum = []
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for i in range(len(sum.types)):
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type = sum.types[i]
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enum.append("%s_kind=%d" % (type.name, i + 1))
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emit("enum _%(name)s_kind {" + ", ".join(enum) + "};")
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emit("struct _%(name)s {")
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emit("enum _%(name)s_kind kind;", depth + 1)
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emit("union {", depth + 1)
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for t in sum.types:
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self.visit(t, depth + 2)
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emit("} v;", depth + 1)
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for field in sum.attributes:
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# rudimentary attribute handling
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type = str(field.type)
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assert type in asdl.builtin_types, type
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emit("%s %s;" % (type, field.name), depth + 1);
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emit("};")
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emit("")
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def visitConstructor(self, cons, depth):
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if cons.fields:
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self.emit("struct {", depth)
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for f in cons.fields:
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self.visit(f, depth + 1)
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self.emit("} %s;" % cons.name, depth)
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self.emit("", depth)
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def visitField(self, field, depth):
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# XXX need to lookup field.type, because it might be something
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# like a builtin...
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ctype = get_c_type(field.type)
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name = field.name
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if field.seq:
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if field.type in self.metadata.simple_sums:
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self.emit("asdl_int_seq *%(name)s;" % locals(), depth)
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else:
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_type = field.type
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self.emit("asdl_%(_type)s_seq *%(name)s;" % locals(), depth)
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else:
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self.emit("%(ctype)s %(name)s;" % locals(), depth)
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def visitProduct(self, product, name, depth):
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self.emit("struct _%(name)s {" % locals(), depth)
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for f in product.fields:
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self.visit(f, depth + 1)
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for field in product.attributes:
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# rudimentary attribute handling
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type = str(field.type)
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assert type in asdl.builtin_types, type
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self.emit("%s %s;" % (type, field.name), depth + 1);
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self.emit("};", depth)
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self.emit("", depth)
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def ast_func_name(name):
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return f"_PyAST_{name}"
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class PrototypeVisitor(EmitVisitor):
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"""Generate function prototypes for the .h file"""
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def visitModule(self, mod):
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for dfn in mod.dfns:
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self.visit(dfn)
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def visitType(self, type):
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self.visit(type.value, type.name)
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def visitSum(self, sum, name):
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if is_simple(sum):
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pass # XXX
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else:
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for t in sum.types:
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self.visit(t, name, sum.attributes)
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def get_args(self, fields):
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"""Return list of C argument info, one for each field.
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Argument info is 3-tuple of a C type, variable name, and flag
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that is true if type can be NULL.
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"""
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args = []
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unnamed = {}
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for f in fields:
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if f.name is None:
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name = f.type
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c = unnamed[name] = unnamed.get(name, 0) + 1
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if c > 1:
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name = "name%d" % (c - 1)
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else:
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name = f.name
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# XXX should extend get_c_type() to handle this
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if f.seq:
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if f.type in self.metadata.simple_sums:
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ctype = "asdl_int_seq *"
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else:
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ctype = f"asdl_{f.type}_seq *"
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else:
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ctype = get_c_type(f.type)
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args.append((ctype, name, f.opt or f.seq))
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return args
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def visitConstructor(self, cons, type, attrs):
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args = self.get_args(cons.fields)
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attrs = self.get_args(attrs)
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ctype = get_c_type(type)
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self.emit_function(cons.name, ctype, args, attrs)
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def emit_function(self, name, ctype, args, attrs, union=True):
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args = args + attrs
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if args:
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argstr = ", ".join(["%s %s" % (atype, aname)
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for atype, aname, opt in args])
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argstr += ", PyArena *arena"
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else:
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argstr = "PyArena *arena"
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self.emit("%s %s(%s);" % (ctype, ast_func_name(name), argstr), False)
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def visitProduct(self, prod, name):
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self.emit_function(name, get_c_type(name),
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self.get_args(prod.fields),
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self.get_args(prod.attributes),
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union=False)
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class FunctionVisitor(PrototypeVisitor):
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"""Visitor to generate constructor functions for AST."""
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def emit_function(self, name, ctype, args, attrs, union=True):
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def emit(s, depth=0, reflow=True):
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self.emit(s, depth, reflow)
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argstr = ", ".join(["%s %s" % (atype, aname)
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for atype, aname, opt in args + attrs])
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if argstr:
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argstr += ", PyArena *arena"
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else:
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argstr = "PyArena *arena"
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self.emit("%s" % ctype, 0)
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emit("%s(%s)" % (ast_func_name(name), argstr))
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emit("{")
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emit("%s p;" % ctype, 1)
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for argtype, argname, opt in args:
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if not opt and argtype != "int":
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emit("if (!%s) {" % argname, 1)
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emit("PyErr_SetString(PyExc_ValueError,", 2)
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msg = "field '%s' is required for %s" % (argname, name)
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emit(' "%s");' % msg,
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2, reflow=False)
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emit('return NULL;', 2)
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emit('}', 1)
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emit("p = (%s)_PyArena_Malloc(arena, sizeof(*p));" % ctype, 1);
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emit("if (!p)", 1)
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emit("return NULL;", 2)
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if union:
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self.emit_body_union(name, args, attrs)
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else:
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self.emit_body_struct(name, args, attrs)
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emit("return p;", 1)
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emit("}")
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emit("")
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def emit_body_union(self, name, args, attrs):
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def emit(s, depth=0, reflow=True):
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self.emit(s, depth, reflow)
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emit("p->kind = %s_kind;" % name, 1)
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for argtype, argname, opt in args:
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emit("p->v.%s.%s = %s;" % (name, argname, argname), 1)
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for argtype, argname, opt in attrs:
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emit("p->%s = %s;" % (argname, argname), 1)
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def emit_body_struct(self, name, args, attrs):
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def emit(s, depth=0, reflow=True):
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self.emit(s, depth, reflow)
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for argtype, argname, opt in args:
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emit("p->%s = %s;" % (argname, argname), 1)
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for argtype, argname, opt in attrs:
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emit("p->%s = %s;" % (argname, argname), 1)
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class PickleVisitor(EmitVisitor):
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def visitModule(self, mod):
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for dfn in mod.dfns:
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self.visit(dfn)
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def visitType(self, type):
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self.visit(type.value, type.name)
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def visitSum(self, sum, name):
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pass
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def visitProduct(self, sum, name):
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pass
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def visitConstructor(self, cons, name):
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pass
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def visitField(self, sum):
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pass
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class Obj2ModPrototypeVisitor(PickleVisitor):
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def visitProduct(self, prod, name):
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code = "static int obj2ast_%s(struct ast_state *state, PyObject* obj, %s* out, PyArena* arena);"
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self.emit(code % (name, get_c_type(name)), 0)
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visitSum = visitProduct
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class Obj2ModVisitor(PickleVisitor):
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attribute_special_defaults = {
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"end_lineno": "lineno",
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"end_col_offset": "col_offset",
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}
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@contextmanager
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def recursive_call(self, node, level):
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self.emit('if (_Py_EnterRecursiveCall(" while traversing \'%s\' node")) {' % node, level, reflow=False)
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self.emit('goto failed;', level + 1)
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self.emit('}', level)
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yield
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self.emit('_Py_LeaveRecursiveCall();', level)
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def funcHeader(self, name):
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ctype = get_c_type(name)
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self.emit("int", 0)
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self.emit("obj2ast_%s(struct ast_state *state, PyObject* obj, %s* out, PyArena* arena)" % (name, ctype), 0)
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self.emit("{", 0)
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self.emit("int isinstance;", 1)
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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 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)
|
|
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, 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 %%.200s\", _PyType_Name(Py_TYPE(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, arena);" %
|
|
field.type, 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, arena);" %
|
|
(field.type, 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, struct validator *vstate, 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, struct validator *vstate, %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.file.write(textwrap.dedent('''
|
|
static int
|
|
add_ast_annotations(struct ast_state *state)
|
|
{
|
|
bool cond;
|
|
'''))
|
|
for dfn in mod.dfns:
|
|
self.visit(dfn)
|
|
self.file.write(textwrap.dedent('''
|
|
return 1;
|
|
}
|
|
'''))
|
|
|
|
def visitProduct(self, prod, name):
|
|
self.emit_annotations(name, prod.fields)
|
|
|
|
def visitSum(self, sum, name):
|
|
for t in sum.types:
|
|
self.visitConstructor(t, name)
|
|
|
|
def visitConstructor(self, cons, name):
|
|
self.emit_annotations(cons.name, cons.fields)
|
|
|
|
def emit_annotations(self, name, fields):
|
|
self.emit(f"PyObject *{name}_annotations = PyDict_New();", 1)
|
|
self.emit(f"if (!{name}_annotations) return 0;", 1)
|
|
for field in fields:
|
|
self.emit("{", 1)
|
|
if field.type in builtin_type_to_c_type:
|
|
self.emit(f"PyObject *type = (PyObject *)&{builtin_type_to_c_type[field.type]};", 2)
|
|
else:
|
|
self.emit(f"PyObject *type = state->{field.type}_type;", 2)
|
|
if field.opt:
|
|
self.emit("type = _Py_union_type_or(type, Py_None);", 2)
|
|
self.emit("cond = type != NULL;", 2)
|
|
self.emit_annotations_error(name, 2)
|
|
elif field.seq:
|
|
self.emit("type = Py_GenericAlias((PyObject *)&PyList_Type, type);", 2)
|
|
self.emit("cond = type != NULL;", 2)
|
|
self.emit_annotations_error(name, 2)
|
|
else:
|
|
self.emit("Py_INCREF(type);", 2)
|
|
self.emit(f"cond = PyDict_SetItemString({name}_annotations, \"{field.name}\", type) == 0;", 2)
|
|
self.emit("Py_DECREF(type);", 2)
|
|
self.emit_annotations_error(name, 2)
|
|
self.emit("}", 1)
|
|
self.emit(f'cond = PyObject_SetAttrString(state->{name}_type, "_field_types", {name}_annotations) == 0;', 1)
|
|
self.emit_annotations_error(name, 1)
|
|
self.emit(f'cond = PyObject_SetAttrString(state->{name}_type, "__annotations__", {name}_annotations) == 0;', 1)
|
|
self.emit_annotations_error(name, 1)
|
|
self.emit(f"Py_DECREF({name}_annotations);", 1)
|
|
|
|
def emit_annotations_error(self, name, depth):
|
|
self.emit("if (!cond) {", depth)
|
|
self.emit(f"Py_DECREF({name}_annotations);", depth + 1)
|
|
self.emit("return 0;", depth + 1)
|
|
self.emit("}", depth)
|
|
|
|
|
|
class PyTypesVisitor(PickleVisitor):
|
|
|
|
def visitModule(self, mod):
|
|
self.emit("""
|
|
|
|
typedef struct {
|
|
PyObject_HEAD
|
|
PyObject *dict;
|
|
} AST_object;
|
|
|
|
static void
|
|
ast_dealloc(AST_object *self)
|
|
{
|
|
/* 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(AST_object *self, visitproc visit, void *arg)
|
|
{
|
|
Py_VISIT(Py_TYPE(self));
|
|
Py_VISIT(self->dict);
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
ast_clear(AST_object *self)
|
|
{
|
|
Py_CLEAR(self->dict);
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
ast_type_init(PyObject *self, PyObject *args, PyObject *kw)
|
|
{
|
|
struct ast_state *state = get_ast_state();
|
|
if (state == NULL) {
|
|
return -1;
|
|
}
|
|
|
|
Py_ssize_t i, numfields = 0;
|
|
int res = -1;
|
|
PyObject *key, *value, *fields, *attributes = NULL, *remaining_fields = NULL;
|
|
if (PyObject_GetOptionalAttr((PyObject*)Py_TYPE(self), state->_fields, &fields) < 0) {
|
|
goto cleanup;
|
|
}
|
|
if (fields) {
|
|
numfields = PySequence_Size(fields);
|
|
if (numfields == -1) {
|
|
goto cleanup;
|
|
}
|
|
remaining_fields = PySet_New(fields);
|
|
}
|
|
else {
|
|
remaining_fields = PySet_New(NULL);
|
|
}
|
|
if (remaining_fields == NULL) {
|
|
goto cleanup;
|
|
}
|
|
|
|
res = 0; /* if no error occurs, this stays 0 to the end */
|
|
if (numfields < PyTuple_GET_SIZE(args)) {
|
|
PyErr_Format(PyExc_TypeError, "%.400s constructor takes at most "
|
|
"%zd positional argument%s",
|
|
_PyType_Name(Py_TYPE(self)),
|
|
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));
|
|
if (PySet_Discard(remaining_fields, name) < 0) {
|
|
res = -1;
|
|
Py_DECREF(name);
|
|
goto cleanup;
|
|
}
|
|
Py_DECREF(name);
|
|
if (res < 0) {
|
|
goto cleanup;
|
|
}
|
|
}
|
|
if (kw) {
|
|
i = 0; /* needed by PyDict_Next */
|
|
while (PyDict_Next(kw, &i, &key, &value)) {
|
|
int contains = PySequence_Contains(fields, key);
|
|
if (contains == -1) {
|
|
res = -1;
|
|
goto cleanup;
|
|
}
|
|
else if (contains == 1) {
|
|
int p = PySet_Discard(remaining_fields, key);
|
|
if (p == -1) {
|
|
res = -1;
|
|
goto cleanup;
|
|
}
|
|
if (p == 0) {
|
|
PyErr_Format(PyExc_TypeError,
|
|
"%.400s got multiple values for argument '%U'",
|
|
Py_TYPE(self)->tp_name, key);
|
|
res = -1;
|
|
goto cleanup;
|
|
}
|
|
}
|
|
else {
|
|
// Lazily initialize "attributes"
|
|
if (attributes == NULL) {
|
|
attributes = PyObject_GetAttr((PyObject*)Py_TYPE(self), state->_attributes);
|
|
if (attributes == NULL) {
|
|
res = -1;
|
|
goto cleanup;
|
|
}
|
|
}
|
|
int contains = PySequence_Contains(attributes, key);
|
|
if (contains == -1) {
|
|
res = -1;
|
|
goto cleanup;
|
|
}
|
|
else if (contains == 0) {
|
|
if (PyErr_WarnFormat(
|
|
PyExc_DeprecationWarning, 1,
|
|
"%.400s.__init__ got an unexpected keyword argument '%U'. "
|
|
"Support for arbitrary keyword arguments is deprecated "
|
|
"and will be removed in Python 3.15.",
|
|
Py_TYPE(self)->tp_name, key
|
|
) < 0) {
|
|
res = -1;
|
|
goto cleanup;
|
|
}
|
|
}
|
|
}
|
|
res = PyObject_SetAttr(self, key, value);
|
|
if (res < 0) {
|
|
goto cleanup;
|
|
}
|
|
}
|
|
}
|
|
Py_ssize_t size = PySet_Size(remaining_fields);
|
|
PyObject *field_types = NULL, *remaining_list = NULL;
|
|
if (size > 0) {
|
|
if (PyObject_GetOptionalAttr((PyObject*)Py_TYPE(self), &_Py_ID(_field_types),
|
|
&field_types) < 0) {
|
|
res = -1;
|
|
goto cleanup;
|
|
}
|
|
if (field_types == NULL) {
|
|
// Probably a user-defined subclass of AST that lacks _field_types.
|
|
// This will continue to work as it did before 3.13; i.e., attributes
|
|
// that are not passed in simply do not exist on the instance.
|
|
goto cleanup;
|
|
}
|
|
remaining_list = PySequence_List(remaining_fields);
|
|
if (!remaining_list) {
|
|
goto set_remaining_cleanup;
|
|
}
|
|
for (Py_ssize_t i = 0; i < size; i++) {
|
|
PyObject *name = PyList_GET_ITEM(remaining_list, i);
|
|
PyObject *type = PyDict_GetItemWithError(field_types, name);
|
|
if (!type) {
|
|
if (PyErr_Occurred()) {
|
|
goto set_remaining_cleanup;
|
|
}
|
|
else {
|
|
if (PyErr_WarnFormat(
|
|
PyExc_DeprecationWarning, 1,
|
|
"Field '%U' is missing from %.400s._field_types. "
|
|
"This will become an error in Python 3.15.",
|
|
name, Py_TYPE(self)->tp_name
|
|
) < 0) {
|
|
goto set_remaining_cleanup;
|
|
}
|
|
}
|
|
}
|
|
else if (_PyUnion_Check(type)) {
|
|
// optional field
|
|
// do nothing, we'll have set a None default on the class
|
|
}
|
|
else if (Py_IS_TYPE(type, &Py_GenericAliasType)) {
|
|
// list field
|
|
PyObject *empty = PyList_New(0);
|
|
if (!empty) {
|
|
goto set_remaining_cleanup;
|
|
}
|
|
res = PyObject_SetAttr(self, name, empty);
|
|
Py_DECREF(empty);
|
|
if (res < 0) {
|
|
goto set_remaining_cleanup;
|
|
}
|
|
}
|
|
else if (type == state->expr_context_type) {
|
|
// special case for expr_context: default to Load()
|
|
res = PyObject_SetAttr(self, name, state->Load_singleton);
|
|
if (res < 0) {
|
|
goto set_remaining_cleanup;
|
|
}
|
|
}
|
|
else {
|
|
// simple field (e.g., identifier)
|
|
if (PyErr_WarnFormat(
|
|
PyExc_DeprecationWarning, 1,
|
|
"%.400s.__init__ missing 1 required positional argument: '%U'. "
|
|
"This will become an error in Python 3.15.",
|
|
Py_TYPE(self)->tp_name, name
|
|
) < 0) {
|
|
goto set_remaining_cleanup;
|
|
}
|
|
}
|
|
}
|
|
Py_DECREF(remaining_list);
|
|
Py_DECREF(field_types);
|
|
}
|
|
cleanup:
|
|
Py_XDECREF(attributes);
|
|
Py_XDECREF(fields);
|
|
Py_XDECREF(remaining_fields);
|
|
return res;
|
|
set_remaining_cleanup:
|
|
Py_XDECREF(remaining_list);
|
|
Py_XDECREF(field_types);
|
|
res = -1;
|
|
goto cleanup;
|
|
}
|
|
|
|
/* Pickling support */
|
|
static PyObject *
|
|
ast_type_reduce(PyObject *self, PyObject *unused)
|
|
{
|
|
struct ast_state *state = get_ast_state();
|
|
if (state == NULL) {
|
|
return NULL;
|
|
}
|
|
|
|
PyObject *dict = NULL, *fields = NULL, *positional_args = NULL;
|
|
if (PyObject_GetOptionalAttr(self, state->__dict__, &dict) < 0) {
|
|
return NULL;
|
|
}
|
|
PyObject *result = NULL;
|
|
if (dict) {
|
|
// Unpickling (or copying) works as follows:
|
|
// - Construct the object with only positional arguments
|
|
// - Set the fields from the dict
|
|
// We have two constraints:
|
|
// - We must set all the required fields in the initial constructor call,
|
|
// or the unpickling or deepcopying of the object will trigger DeprecationWarnings.
|
|
// - We must not include child nodes in the positional args, because
|
|
// that may trigger runaway recursion during copying (gh-120108).
|
|
// To satisfy both constraints, we set all the fields to None in the
|
|
// initial list of positional args, and then set the fields from the dict.
|
|
if (PyObject_GetOptionalAttr((PyObject*)Py_TYPE(self), state->_fields, &fields) < 0) {
|
|
goto cleanup;
|
|
}
|
|
if (fields) {
|
|
Py_ssize_t numfields = PySequence_Size(fields);
|
|
if (numfields == -1) {
|
|
Py_DECREF(dict);
|
|
goto cleanup;
|
|
}
|
|
positional_args = PyList_New(0);
|
|
if (!positional_args) {
|
|
goto cleanup;
|
|
}
|
|
for (Py_ssize_t i = 0; i < numfields; i++) {
|
|
PyObject *name = PySequence_GetItem(fields, i);
|
|
if (!name) {
|
|
goto cleanup;
|
|
}
|
|
PyObject *value;
|
|
int rc = PyDict_GetItemRef(dict, name, &value);
|
|
Py_DECREF(name);
|
|
if (rc < 0) {
|
|
goto cleanup;
|
|
}
|
|
if (!value) {
|
|
break;
|
|
}
|
|
rc = PyList_Append(positional_args, Py_None);
|
|
Py_DECREF(value);
|
|
if (rc < 0) {
|
|
goto cleanup;
|
|
}
|
|
}
|
|
PyObject *args_tuple = PyList_AsTuple(positional_args);
|
|
if (!args_tuple) {
|
|
goto cleanup;
|
|
}
|
|
result = Py_BuildValue("ONN", Py_TYPE(self), args_tuple, dict);
|
|
}
|
|
else {
|
|
result = Py_BuildValue("O()N", Py_TYPE(self), dict);
|
|
}
|
|
}
|
|
else {
|
|
result = Py_BuildValue("O()", Py_TYPE(self));
|
|
}
|
|
cleanup:
|
|
Py_XDECREF(fields);
|
|
Py_XDECREF(positional_args);
|
|
return result;
|
|
}
|
|
|
|
/*
|
|
* Perform the following validations:
|
|
*
|
|
* - All keyword arguments are known 'fields' or 'attributes'.
|
|
* - No field or attribute would be left unfilled after copy.replace().
|
|
*
|
|
* On success, this returns 1. Otherwise, set a TypeError
|
|
* exception and returns -1 (no exception is set if some
|
|
* other internal errors occur).
|
|
*
|
|
* Parameters
|
|
*
|
|
* self The AST node instance.
|
|
* dict The AST node instance dictionary (self.__dict__).
|
|
* fields The list of fields (self._fields).
|
|
* attributes The list of attributes (self._attributes).
|
|
* kwargs Keyword arguments passed to ast_type_replace().
|
|
*
|
|
* The 'dict', 'fields', 'attributes' and 'kwargs' arguments can be NULL.
|
|
*
|
|
* Note: this function can be removed in 3.15 since the verification
|
|
* will be done inside the constructor.
|
|
*/
|
|
static inline int
|
|
ast_type_replace_check(PyObject *self,
|
|
PyObject *dict,
|
|
PyObject *fields,
|
|
PyObject *attributes,
|
|
PyObject *kwargs)
|
|
{
|
|
// While it is possible to make some fast paths that would avoid
|
|
// allocating objects on the stack, this would cost us readability.
|
|
// For instance, if 'fields' and 'attributes' are both empty, and
|
|
// 'kwargs' is not empty, we could raise a TypeError immediately.
|
|
PyObject *expecting = PySet_New(fields);
|
|
if (expecting == NULL) {
|
|
return -1;
|
|
}
|
|
if (attributes) {
|
|
if (_PySet_Update(expecting, attributes) < 0) {
|
|
Py_DECREF(expecting);
|
|
return -1;
|
|
}
|
|
}
|
|
// Any keyword argument that is neither a field nor attribute is rejected.
|
|
// We first need to check whether a keyword argument is accepted or not.
|
|
// If all keyword arguments are accepted, we compute the required fields
|
|
// and attributes. A field or attribute is not needed if:
|
|
//
|
|
// 1) it is given in 'kwargs', or
|
|
// 2) it already exists on 'self'.
|
|
if (kwargs) {
|
|
Py_ssize_t pos = 0;
|
|
PyObject *key, *value;
|
|
while (PyDict_Next(kwargs, &pos, &key, &value)) {
|
|
int rc = PySet_Discard(expecting, key);
|
|
if (rc < 0) {
|
|
Py_DECREF(expecting);
|
|
return -1;
|
|
}
|
|
if (rc == 0) {
|
|
PyErr_Format(PyExc_TypeError,
|
|
"%.400s.__replace__ got an unexpected keyword "
|
|
"argument '%U'.", Py_TYPE(self)->tp_name, key);
|
|
Py_DECREF(expecting);
|
|
return -1;
|
|
}
|
|
}
|
|
}
|
|
// check that the remaining fields or attributes would be filled
|
|
if (dict) {
|
|
Py_ssize_t pos = 0;
|
|
PyObject *key, *value;
|
|
while (PyDict_Next(dict, &pos, &key, &value)) {
|
|
// Mark fields or attributes that are found on the instance
|
|
// as non-mandatory. If they are not given in 'kwargs', they
|
|
// will be shallow-coied; otherwise, they would be replaced
|
|
// (not in this function).
|
|
if (PySet_Discard(expecting, key) < 0) {
|
|
Py_DECREF(expecting);
|
|
return -1;
|
|
}
|
|
}
|
|
if (attributes) {
|
|
// Some attributes may or may not be present at runtime.
|
|
// In particular, now that we checked whether 'kwargs'
|
|
// is correct or not, we allow any attribute to be missing.
|
|
//
|
|
// Note that fields must still be entirely determined when
|
|
// calling the constructor later.
|
|
PyObject *unused = PyObject_CallMethodOneArg(expecting,
|
|
&_Py_ID(difference_update),
|
|
attributes);
|
|
if (unused == NULL) {
|
|
Py_DECREF(expecting);
|
|
return -1;
|
|
}
|
|
Py_DECREF(unused);
|
|
}
|
|
}
|
|
// Now 'expecting' contains the fields or attributes
|
|
// that would not be filled inside ast_type_replace().
|
|
Py_ssize_t m = PySet_GET_SIZE(expecting);
|
|
if (m > 0) {
|
|
PyObject *names = PyList_New(m);
|
|
if (names == NULL) {
|
|
Py_DECREF(expecting);
|
|
return -1;
|
|
}
|
|
Py_ssize_t i = 0, pos = 0;
|
|
PyObject *item;
|
|
Py_hash_t hash;
|
|
while (_PySet_NextEntry(expecting, &pos, &item, &hash)) {
|
|
PyObject *name = PyObject_Repr(item);
|
|
if (name == NULL) {
|
|
Py_DECREF(expecting);
|
|
Py_DECREF(names);
|
|
return -1;
|
|
}
|
|
// steal the reference 'name'
|
|
PyList_SET_ITEM(names, i++, name);
|
|
}
|
|
Py_DECREF(expecting);
|
|
if (PyList_Sort(names) < 0) {
|
|
Py_DECREF(names);
|
|
return -1;
|
|
}
|
|
PyObject *sep = PyUnicode_FromString(", ");
|
|
if (sep == NULL) {
|
|
Py_DECREF(names);
|
|
return -1;
|
|
}
|
|
PyObject *str_names = PyUnicode_Join(sep, names);
|
|
Py_DECREF(sep);
|
|
Py_DECREF(names);
|
|
if (str_names == NULL) {
|
|
return -1;
|
|
}
|
|
PyErr_Format(PyExc_TypeError,
|
|
"%.400s.__replace__ missing %ld keyword argument%s: %U.",
|
|
Py_TYPE(self)->tp_name, m, m == 1 ? "" : "s", str_names);
|
|
Py_DECREF(str_names);
|
|
return -1;
|
|
}
|
|
else {
|
|
Py_DECREF(expecting);
|
|
return 1;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Python equivalent:
|
|
*
|
|
* for key in keys:
|
|
* if hasattr(self, key):
|
|
* payload[key] = getattr(self, key)
|
|
*
|
|
* The 'keys' argument is a sequence corresponding to
|
|
* the '_fields' or the '_attributes' of an AST node.
|
|
*
|
|
* This returns -1 if an error occurs and 0 otherwise.
|
|
*
|
|
* Parameters
|
|
*
|
|
* payload A dictionary to fill.
|
|
* keys A sequence of keys or NULL for an empty sequence.
|
|
* dict The AST node instance dictionary (must not be NULL).
|
|
*/
|
|
static inline int
|
|
ast_type_replace_update_payload(PyObject *payload,
|
|
PyObject *keys,
|
|
PyObject *dict)
|
|
{
|
|
assert(dict != NULL);
|
|
if (keys == NULL) {
|
|
return 0;
|
|
}
|
|
Py_ssize_t n = PySequence_Size(keys);
|
|
if (n == -1) {
|
|
return -1;
|
|
}
|
|
for (Py_ssize_t i = 0; i < n; i++) {
|
|
PyObject *key = PySequence_GetItem(keys, i);
|
|
if (key == NULL) {
|
|
return -1;
|
|
}
|
|
PyObject *value;
|
|
if (PyDict_GetItemRef(dict, key, &value) < 0) {
|
|
Py_DECREF(key);
|
|
return -1;
|
|
}
|
|
if (value == NULL) {
|
|
Py_DECREF(key);
|
|
// If a field or attribute is not present at runtime, it should
|
|
// be explicitly given in 'kwargs'. If not, the constructor will
|
|
// issue a warning (which becomes an error in 3.15).
|
|
continue;
|
|
}
|
|
int rc = PyDict_SetItem(payload, key, value);
|
|
Py_DECREF(key);
|
|
Py_DECREF(value);
|
|
if (rc < 0) {
|
|
return -1;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/* copy.replace() support (shallow copy) */
|
|
static PyObject *
|
|
ast_type_replace(PyObject *self, PyObject *args, PyObject *kwargs)
|
|
{
|
|
if (!_PyArg_NoPositional("__replace__", args)) {
|
|
return NULL;
|
|
}
|
|
|
|
struct ast_state *state = get_ast_state();
|
|
if (state == NULL) {
|
|
return NULL;
|
|
}
|
|
|
|
PyObject *result = NULL;
|
|
// known AST class fields and attributes
|
|
PyObject *fields = NULL, *attributes = NULL;
|
|
// current instance dictionary
|
|
PyObject *dict = NULL;
|
|
// constructor positional and keyword arguments
|
|
PyObject *empty_tuple = NULL, *payload = NULL;
|
|
|
|
PyObject *type = (PyObject *)Py_TYPE(self);
|
|
if (PyObject_GetOptionalAttr(type, state->_fields, &fields) < 0) {
|
|
goto cleanup;
|
|
}
|
|
if (PyObject_GetOptionalAttr(type, state->_attributes, &attributes) < 0) {
|
|
goto cleanup;
|
|
}
|
|
if (PyObject_GetOptionalAttr(self, state->__dict__, &dict) < 0) {
|
|
goto cleanup;
|
|
}
|
|
if (ast_type_replace_check(self, dict, fields, attributes, kwargs) < 0) {
|
|
goto cleanup;
|
|
}
|
|
empty_tuple = PyTuple_New(0);
|
|
if (empty_tuple == NULL) {
|
|
goto cleanup;
|
|
}
|
|
payload = PyDict_New();
|
|
if (payload == NULL) {
|
|
goto cleanup;
|
|
}
|
|
if (dict) { // in case __dict__ is missing (for some obscure reason)
|
|
// copy the instance's fields (possibly NULL)
|
|
if (ast_type_replace_update_payload(payload, fields, dict) < 0) {
|
|
goto cleanup;
|
|
}
|
|
// copy the instance's attributes (possibly NULL)
|
|
if (ast_type_replace_update_payload(payload, attributes, dict) < 0) {
|
|
goto cleanup;
|
|
}
|
|
}
|
|
if (kwargs && PyDict_Update(payload, kwargs) < 0) {
|
|
goto cleanup;
|
|
}
|
|
result = PyObject_Call(type, empty_tuple, payload);
|
|
cleanup:
|
|
Py_XDECREF(payload);
|
|
Py_XDECREF(empty_tuple);
|
|
Py_XDECREF(dict);
|
|
Py_XDECREF(attributes);
|
|
Py_XDECREF(fields);
|
|
return result;
|
|
}
|
|
|
|
static PyMemberDef ast_type_members[] = {
|
|
{"__dictoffset__", Py_T_PYSSIZET, offsetof(AST_object, dict), Py_READONLY},
|
|
{NULL} /* Sentinel */
|
|
};
|
|
|
|
static PyMethodDef ast_type_methods[] = {
|
|
{"__reduce__", ast_type_reduce, METH_NOARGS, NULL},
|
|
{"__replace__", _PyCFunction_CAST(ast_type_replace), METH_VARARGS | METH_KEYWORDS,
|
|
PyDoc_STR("__replace__($self, /, **fields)\\n--\\n\\n"
|
|
"Return a copy of the AST node with new values "
|
|
"for the specified fields.")},
|
|
{NULL}
|
|
};
|
|
|
|
static PyGetSetDef ast_type_getsets[] = {
|
|
{"__dict__", PyObject_GenericGetDict, PyObject_GenericSetDict},
|
|
{NULL}
|
|
};
|
|
|
|
static PyType_Slot AST_type_slots[] = {
|
|
{Py_tp_dealloc, ast_dealloc},
|
|
{Py_tp_getattro, PyObject_GenericGetAttr},
|
|
{Py_tp_setattro, PyObject_GenericSetAttr},
|
|
{Py_tp_traverse, ast_traverse},
|
|
{Py_tp_clear, ast_clear},
|
|
{Py_tp_members, ast_type_members},
|
|
{Py_tp_methods, ast_type_methods},
|
|
{Py_tp_getset, ast_type_getsets},
|
|
{Py_tp_init, ast_type_init},
|
|
{Py_tp_alloc, PyType_GenericAlloc},
|
|
{Py_tp_new, PyType_GenericNew},
|
|
{Py_tp_free, PyObject_GC_Del},
|
|
{0, 0},
|
|
};
|
|
|
|
static PyType_Spec AST_type_spec = {
|
|
"ast.AST",
|
|
sizeof(AST_object),
|
|
0,
|
|
Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE | Py_TPFLAGS_HAVE_GC,
|
|
AST_type_slots
|
|
};
|
|
|
|
static PyObject *
|
|
make_type(struct ast_state *state, const char *type, PyObject* base,
|
|
const char* const* fields, int num_fields, const char *doc)
|
|
{
|
|
PyObject *fnames, *result;
|
|
int i;
|
|
fnames = PyTuple_New(num_fields);
|
|
if (!fnames) return NULL;
|
|
for (i = 0; i < num_fields; i++) {
|
|
PyObject *field = PyUnicode_InternFromString(fields[i]);
|
|
if (!field) {
|
|
Py_DECREF(fnames);
|
|
return NULL;
|
|
}
|
|
PyTuple_SET_ITEM(fnames, i, field);
|
|
}
|
|
result = PyObject_CallFunction((PyObject*)&PyType_Type, "s(O){OOOOOOOs}",
|
|
type, base,
|
|
state->_fields, fnames,
|
|
state->__match_args__, fnames,
|
|
state->__module__,
|
|
state->ast,
|
|
state->__doc__, doc);
|
|
Py_DECREF(fnames);
|
|
return result;
|
|
}
|
|
|
|
static int
|
|
add_attributes(struct ast_state *state, PyObject *type, const char * const *attrs, int num_fields)
|
|
{
|
|
int i, result;
|
|
PyObject *s, *l = PyTuple_New(num_fields);
|
|
if (!l)
|
|
return -1;
|
|
for (i = 0; i < num_fields; i++) {
|
|
s = PyUnicode_InternFromString(attrs[i]);
|
|
if (!s) {
|
|
Py_DECREF(l);
|
|
return -1;
|
|
}
|
|
PyTuple_SET_ITEM(l, i, s);
|
|
}
|
|
result = PyObject_SetAttr(type, state->_attributes, l);
|
|
Py_DECREF(l);
|
|
return result;
|
|
}
|
|
|
|
/* Conversion AST -> Python */
|
|
|
|
static PyObject* ast2obj_list(struct ast_state *state, struct validator *vstate, asdl_seq *seq,
|
|
PyObject* (*func)(struct ast_state *state, struct validator *vstate, void*))
|
|
{
|
|
Py_ssize_t 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(state, vstate, asdl_seq_GET_UNTYPED(seq, i));
|
|
if (!value) {
|
|
Py_DECREF(result);
|
|
return NULL;
|
|
}
|
|
PyList_SET_ITEM(result, i, value);
|
|
}
|
|
return result;
|
|
}
|
|
|
|
static PyObject* ast2obj_object(struct ast_state *Py_UNUSED(state), struct validator *Py_UNUSED(vstate), void *o)
|
|
{
|
|
PyObject *op = (PyObject*)o;
|
|
if (!op) {
|
|
op = Py_None;
|
|
}
|
|
return Py_NewRef(op);
|
|
}
|
|
#define ast2obj_constant ast2obj_object
|
|
#define ast2obj_identifier ast2obj_object
|
|
#define ast2obj_string ast2obj_object
|
|
|
|
static PyObject* ast2obj_int(struct ast_state *Py_UNUSED(state), struct validator *Py_UNUSED(vstate), long b)
|
|
{
|
|
return PyLong_FromLong(b);
|
|
}
|
|
|
|
/* Conversion Python -> AST */
|
|
|
|
static int obj2ast_object(struct ast_state *Py_UNUSED(state), PyObject* obj, PyObject** out, PyArena* arena)
|
|
{
|
|
if (obj == Py_None)
|
|
obj = NULL;
|
|
if (obj) {
|
|
if (_PyArena_AddPyObject(arena, obj) < 0) {
|
|
*out = NULL;
|
|
return -1;
|
|
}
|
|
*out = Py_NewRef(obj);
|
|
}
|
|
else {
|
|
*out = NULL;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int obj2ast_constant(struct ast_state *Py_UNUSED(state), PyObject* obj, PyObject** out, PyArena* arena)
|
|
{
|
|
if (_PyArena_AddPyObject(arena, obj) < 0) {
|
|
*out = NULL;
|
|
return -1;
|
|
}
|
|
*out = Py_NewRef(obj);
|
|
return 0;
|
|
}
|
|
|
|
static int obj2ast_identifier(struct ast_state *state, PyObject* obj, PyObject** out, PyArena* arena)
|
|
{
|
|
if (!PyUnicode_CheckExact(obj) && obj != Py_None) {
|
|
PyErr_SetString(PyExc_TypeError, "AST identifier must be of type str");
|
|
return -1;
|
|
}
|
|
return obj2ast_object(state, obj, out, arena);
|
|
}
|
|
|
|
static int obj2ast_string(struct ast_state *state, PyObject* obj, PyObject** out, PyArena* arena)
|
|
{
|
|
if (!PyUnicode_CheckExact(obj) && !PyBytes_CheckExact(obj)) {
|
|
PyErr_SetString(PyExc_TypeError, "AST string must be of type str");
|
|
return -1;
|
|
}
|
|
return obj2ast_object(state, obj, out, arena);
|
|
}
|
|
|
|
static int obj2ast_int(struct ast_state* Py_UNUSED(state), PyObject* obj, int* out, PyArena* arena)
|
|
{
|
|
int i;
|
|
if (!PyLong_Check(obj)) {
|
|
PyErr_Format(PyExc_ValueError, "invalid integer value: %R", obj);
|
|
return -1;
|
|
}
|
|
|
|
i = PyLong_AsInt(obj);
|
|
if (i == -1 && PyErr_Occurred())
|
|
return -1;
|
|
*out = i;
|
|
return 0;
|
|
}
|
|
|
|
static int add_ast_fields(struct ast_state *state)
|
|
{
|
|
PyObject *empty_tuple;
|
|
empty_tuple = PyTuple_New(0);
|
|
if (!empty_tuple ||
|
|
PyObject_SetAttrString(state->AST_type, "_fields", empty_tuple) < 0 ||
|
|
PyObject_SetAttrString(state->AST_type, "__match_args__", empty_tuple) < 0 ||
|
|
PyObject_SetAttrString(state->AST_type, "_attributes", empty_tuple) < 0) {
|
|
Py_XDECREF(empty_tuple);
|
|
return -1;
|
|
}
|
|
Py_DECREF(empty_tuple);
|
|
return 0;
|
|
}
|
|
|
|
""", 0, reflow=False)
|
|
|
|
self.file.write(textwrap.dedent('''
|
|
static int
|
|
init_types(struct ast_state *state)
|
|
{
|
|
if (init_identifiers(state) < 0) {
|
|
return -1;
|
|
}
|
|
state->AST_type = PyType_FromSpec(&AST_type_spec);
|
|
if (!state->AST_type) {
|
|
return -1;
|
|
}
|
|
if (add_ast_fields(state) < 0) {
|
|
return -1;
|
|
}
|
|
'''))
|
|
for dfn in mod.dfns:
|
|
self.visit(dfn)
|
|
self.file.write(textwrap.dedent('''
|
|
if (!add_ast_annotations(state)) {
|
|
return -1;
|
|
}
|
|
return 0;
|
|
}
|
|
'''))
|
|
|
|
def visitProduct(self, prod, name):
|
|
if prod.fields:
|
|
fields = name+"_fields"
|
|
else:
|
|
fields = "NULL"
|
|
self.emit('state->%s_type = make_type(state, "%s", state->AST_type, %s, %d,' %
|
|
(name, name, fields, len(prod.fields)), 1)
|
|
self.emit('%s);' % reflow_c_string(asdl_of(name, prod), 2), 2, reflow=False)
|
|
self.emit("if (!state->%s_type) return -1;" % name, 1)
|
|
if prod.attributes:
|
|
self.emit("if (add_attributes(state, state->%s_type, %s_attributes, %d) < 0) return -1;" %
|
|
(name, name, len(prod.attributes)), 1)
|
|
else:
|
|
self.emit("if (add_attributes(state, state->%s_type, NULL, 0) < 0) return -1;" % name, 1)
|
|
self.emit_defaults(name, prod.fields, 1)
|
|
self.emit_defaults(name, prod.attributes, 1)
|
|
|
|
def visitSum(self, sum, name):
|
|
self.emit('state->%s_type = make_type(state, "%s", state->AST_type, NULL, 0,' %
|
|
(name, name), 1)
|
|
self.emit('%s);' % reflow_c_string(asdl_of(name, sum), 2), 2, reflow=False)
|
|
self.emit("if (!state->%s_type) return -1;" % name, 1)
|
|
if sum.attributes:
|
|
self.emit("if (add_attributes(state, state->%s_type, %s_attributes, %d) < 0) return -1;" %
|
|
(name, name, len(sum.attributes)), 1)
|
|
else:
|
|
self.emit("if (add_attributes(state, state->%s_type, NULL, 0) < 0) return -1;" % name, 1)
|
|
self.emit_defaults(name, sum.attributes, 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+"_fields"
|
|
else:
|
|
fields = "NULL"
|
|
self.emit('state->%s_type = make_type(state, "%s", state->%s_type, %s, %d,' %
|
|
(cons.name, cons.name, name, fields, len(cons.fields)), 1)
|
|
self.emit('%s);' % reflow_c_string(asdl_of(cons.name, cons), 2), 2, reflow=False)
|
|
self.emit("if (!state->%s_type) return -1;" % cons.name, 1)
|
|
self.emit_defaults(cons.name, cons.fields, 1)
|
|
if simple:
|
|
self.emit("state->%s_singleton = PyType_GenericNew((PyTypeObject *)"
|
|
"state->%s_type, NULL, NULL);" %
|
|
(cons.name, cons.name), 1)
|
|
self.emit("if (!state->%s_singleton) return -1;" % cons.name, 1)
|
|
|
|
def emit_defaults(self, name, fields, depth):
|
|
for field in fields:
|
|
if field.opt:
|
|
self.emit('if (PyObject_SetAttr(state->%s_type, state->%s, Py_None) == -1)' %
|
|
(name, field.name), depth)
|
|
self.emit("return -1;", depth+1)
|
|
|
|
|
|
class ASTModuleVisitor(PickleVisitor):
|
|
|
|
def visitModule(self, mod):
|
|
self.emit("static int", 0)
|
|
self.emit("astmodule_exec(PyObject *m)", 0)
|
|
self.emit("{", 0)
|
|
self.emit('struct ast_state *state = get_ast_state();', 1)
|
|
self.emit('if (state == NULL) {', 1)
|
|
self.emit('return -1;', 2)
|
|
self.emit('}', 1)
|
|
self.emit('if (PyModule_AddObjectRef(m, "AST", state->AST_type) < 0) {', 1)
|
|
self.emit('return -1;', 2)
|
|
self.emit('}', 1)
|
|
self.emit('if (PyModule_AddIntMacro(m, PyCF_ALLOW_TOP_LEVEL_AWAIT) < 0) {', 1)
|
|
self.emit("return -1;", 2)
|
|
self.emit('}', 1)
|
|
self.emit('if (PyModule_AddIntMacro(m, PyCF_ONLY_AST) < 0) {', 1)
|
|
self.emit("return -1;", 2)
|
|
self.emit('}', 1)
|
|
self.emit('if (PyModule_AddIntMacro(m, PyCF_TYPE_COMMENTS) < 0) {', 1)
|
|
self.emit("return -1;", 2)
|
|
self.emit('}', 1)
|
|
self.emit('if (PyModule_AddIntMacro(m, PyCF_OPTIMIZED_AST) < 0) {', 1)
|
|
self.emit("return -1;", 2)
|
|
self.emit('}', 1)
|
|
for dfn in mod.dfns:
|
|
self.visit(dfn)
|
|
self.emit("return 0;", 1)
|
|
self.emit("}", 0)
|
|
self.emit("", 0)
|
|
self.emit("""
|
|
static PyModuleDef_Slot astmodule_slots[] = {
|
|
{Py_mod_exec, astmodule_exec},
|
|
{Py_mod_multiple_interpreters, Py_MOD_PER_INTERPRETER_GIL_SUPPORTED},
|
|
{Py_mod_gil, Py_MOD_GIL_NOT_USED},
|
|
{0, NULL}
|
|
};
|
|
|
|
static struct PyModuleDef _astmodule = {
|
|
PyModuleDef_HEAD_INIT,
|
|
.m_name = "_ast",
|
|
// The _ast module uses a per-interpreter state (PyInterpreterState.ast)
|
|
.m_size = 0,
|
|
.m_slots = astmodule_slots,
|
|
};
|
|
|
|
PyMODINIT_FUNC
|
|
PyInit__ast(void)
|
|
{
|
|
return PyModuleDef_Init(&_astmodule);
|
|
}
|
|
""".strip(), 0, reflow=False)
|
|
|
|
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 (PyModule_AddObjectRef(m, \"%s\", "
|
|
"state->%s_type) < 0) {" % (name, name), 1)
|
|
self.emit("return -1;", 2)
|
|
self.emit('}', 1)
|
|
|
|
|
|
class StaticVisitor(PickleVisitor):
|
|
CODE = '''Very simple, always emit this static code. Override 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(struct ast_state *state, struct validator *vstate, 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("PyTypeObject *tp;", 1)
|
|
self.emit('if (!o) {', 1)
|
|
self.emit("Py_RETURN_NONE;", 2)
|
|
self.emit("}", 1)
|
|
self.emit("if (++vstate->recursion_depth > vstate->recursion_limit) {", 1)
|
|
self.emit("PyErr_SetString(PyExc_RecursionError,", 2)
|
|
self.emit('"maximum recursion depth exceeded during ast construction");', 3)
|
|
self.emit("return NULL;", 2)
|
|
self.emit("}", 1)
|
|
|
|
def func_end(self):
|
|
self.emit("vstate->recursion_depth--;", 1)
|
|
self.emit("return result;", 1)
|
|
self.emit("failed:", 0)
|
|
self.emit("vstate->recursion_depth--;", 1)
|
|
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(state, vstate, o->%s);" % (a.type, a.name), 1)
|
|
self.emit("if (!value) goto failed;", 1)
|
|
self.emit('if (PyObject_SetAttr(result, state->%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(struct ast_state *state, struct validator *vstate, %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("return Py_NewRef(state->%s_singleton);" % t.name, 3)
|
|
self.emit("}", 1)
|
|
self.emit("Py_UNREACHABLE();", 1);
|
|
self.emit("}", 0)
|
|
|
|
def visitProduct(self, prod, name):
|
|
self.func_begin(name)
|
|
self.emit("tp = (PyTypeObject *)state->%s_type;" % name, 1)
|
|
self.emit("result = PyType_GenericNew(tp, NULL, NULL);", 1);
|
|
self.emit("if (!result) return NULL;", 1)
|
|
for field in prod.fields:
|
|
self.visitField(field, name, 1, True)
|
|
for a in prod.attributes:
|
|
self.emit("value = ast2obj_%s(state, vstate, o->%s);" % (a.type, a.name), 1)
|
|
self.emit("if (!value) goto failed;", 1)
|
|
self.emit("if (PyObject_SetAttr(result, state->%s, value) < 0)" % a.name, 1)
|
|
self.emit('goto failed;', 2)
|
|
self.emit('Py_DECREF(value);', 1)
|
|
self.func_end()
|
|
|
|
def visitConstructor(self, cons, enum, name):
|
|
self.emit("case %s_kind:" % cons.name, 1)
|
|
self.emit("tp = (PyTypeObject *)state->%s_type;" % cons.name, 2)
|
|
self.emit("result = PyType_GenericNew(tp, NULL, NULL);", 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_SetAttr(result, state->%s, value) == -1)" % field.name, 0)
|
|
emit("goto failed;", 1)
|
|
emit("Py_DECREF(value);", 0)
|
|
|
|
def set(self, field, value, depth):
|
|
if field.seq:
|
|
if field.type in self.metadata.simple_sums:
|
|
# While the sequence elements are stored as void*,
|
|
# simple sums expects an enum
|
|
self.emit("{", depth)
|
|
self.emit("Py_ssize_t 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_{0}(state, vstate, ({0}_ty)asdl_seq_GET({1}, i)));".format(
|
|
field.type,
|
|
value
|
|
),
|
|
depth + 2,
|
|
reflow=False,
|
|
)
|
|
self.emit("}", depth)
|
|
else:
|
|
self.emit("value = ast2obj_list(state, vstate, (asdl_seq*)%s, ast2obj_%s);" % (value, field.type), depth)
|
|
else:
|
|
self.emit("value = ast2obj_%s(state, vstate, %s);" % (field.type, value), depth, reflow=False)
|
|
|
|
|
|
class PartingShots(StaticVisitor):
|
|
|
|
CODE = """
|
|
PyObject* PyAST_mod2obj(mod_ty t)
|
|
{
|
|
struct ast_state *state = get_ast_state();
|
|
if (state == NULL) {
|
|
return NULL;
|
|
}
|
|
|
|
int starting_recursion_depth;
|
|
/* Be careful here to prevent overflow. */
|
|
PyThreadState *tstate = _PyThreadState_GET();
|
|
if (!tstate) {
|
|
return NULL;
|
|
}
|
|
struct validator vstate;
|
|
vstate.recursion_limit = Py_C_RECURSION_LIMIT;
|
|
int recursion_depth = Py_C_RECURSION_LIMIT - tstate->c_recursion_remaining;
|
|
starting_recursion_depth = recursion_depth;
|
|
vstate.recursion_depth = starting_recursion_depth;
|
|
|
|
PyObject *result = ast2obj_mod(state, &vstate, t);
|
|
|
|
/* Check that the recursion depth counting balanced correctly */
|
|
if (result && vstate.recursion_depth != starting_recursion_depth) {
|
|
PyErr_Format(PyExc_SystemError,
|
|
"AST constructor recursion depth mismatch (before=%d, after=%d)",
|
|
starting_recursion_depth, vstate.recursion_depth);
|
|
return NULL;
|
|
}
|
|
return result;
|
|
}
|
|
|
|
/* mode is 0 for "exec", 1 for "eval" and 2 for "single" input */
|
|
mod_ty PyAST_obj2mod(PyObject* ast, PyArena* arena, int mode)
|
|
{
|
|
const char * const req_name[] = {"Module", "Expression", "Interactive"};
|
|
int isinstance;
|
|
|
|
if (PySys_Audit("compile", "OO", ast, Py_None) < 0) {
|
|
return NULL;
|
|
}
|
|
|
|
struct ast_state *state = get_ast_state();
|
|
if (state == NULL) {
|
|
return NULL;
|
|
}
|
|
|
|
PyObject *req_type[3];
|
|
req_type[0] = state->Module_type;
|
|
req_type[1] = state->Expression_type;
|
|
req_type[2] = state->Interactive_type;
|
|
|
|
assert(0 <= mode && mode <= 2);
|
|
|
|
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], _PyType_Name(Py_TYPE(ast)));
|
|
return NULL;
|
|
}
|
|
|
|
mod_ty res = NULL;
|
|
if (obj2ast_mod(state, ast, &res, arena) != 0)
|
|
return NULL;
|
|
else
|
|
return res;
|
|
}
|
|
|
|
int PyAST_Check(PyObject* obj)
|
|
{
|
|
struct ast_state *state = get_ast_state();
|
|
if (state == NULL) {
|
|
return -1;
|
|
}
|
|
return PyObject_IsInstance(obj, state->AST_type);
|
|
}
|
|
"""
|
|
|
|
class ChainOfVisitors:
|
|
def __init__(self, *visitors, metadata = None):
|
|
self.visitors = visitors
|
|
self.metadata = metadata
|
|
|
|
def visit(self, object):
|
|
for v in self.visitors:
|
|
v.metadata = self.metadata
|
|
v.visit(object)
|
|
v.emit("", 0)
|
|
|
|
|
|
def generate_ast_state(module_state, f):
|
|
f.write('struct ast_state {\n')
|
|
f.write(' _PyOnceFlag once;\n')
|
|
f.write(' int finalized;\n')
|
|
for s in module_state:
|
|
f.write(' PyObject *' + s + ';\n')
|
|
f.write('};')
|
|
|
|
|
|
def generate_ast_fini(module_state, f):
|
|
f.write(textwrap.dedent("""
|
|
void _PyAST_Fini(PyInterpreterState *interp)
|
|
{
|
|
struct ast_state *state = &interp->ast;
|
|
|
|
"""))
|
|
for s in module_state:
|
|
f.write(" Py_CLEAR(state->" + s + ');\n')
|
|
f.write(textwrap.dedent("""
|
|
Py_CLEAR(_Py_INTERP_CACHED_OBJECT(interp, str_replace_inf));
|
|
|
|
state->finalized = 1;
|
|
state->once = (_PyOnceFlag){0};
|
|
}
|
|
|
|
"""))
|
|
|
|
|
|
def generate_module_def(mod, metadata, f, internal_h):
|
|
# Gather all the data needed for ModuleSpec
|
|
state_strings = {
|
|
"ast",
|
|
"_fields",
|
|
"__match_args__",
|
|
"__doc__",
|
|
"__dict__",
|
|
"__module__",
|
|
"_attributes",
|
|
*metadata.identifiers
|
|
}
|
|
|
|
module_state = state_strings.copy()
|
|
module_state.update(
|
|
"%s_singleton" % singleton
|
|
for singleton in metadata.singletons
|
|
)
|
|
module_state.update(
|
|
"%s_type" % type
|
|
for type in metadata.types
|
|
)
|
|
|
|
state_strings = sorted(state_strings)
|
|
module_state = sorted(module_state)
|
|
|
|
generate_ast_state(module_state, internal_h)
|
|
|
|
print(textwrap.dedent("""
|
|
#include "Python.h"
|
|
#include "pycore_ast.h"
|
|
#include "pycore_ast_state.h" // struct ast_state
|
|
#include "pycore_ceval.h" // _Py_EnterRecursiveCall
|
|
#include "pycore_lock.h" // _PyOnceFlag
|
|
#include "pycore_interp.h" // _PyInterpreterState.ast
|
|
#include "pycore_modsupport.h" // _PyArg_NoPositional()
|
|
#include "pycore_pystate.h" // _PyInterpreterState_GET()
|
|
#include "pycore_setobject.h" // _PySet_NextEntry(), _PySet_Update()
|
|
#include "pycore_unionobject.h" // _Py_union_type_or
|
|
#include "structmember.h"
|
|
#include <stddef.h>
|
|
|
|
struct validator {
|
|
int recursion_depth; /* current recursion depth */
|
|
int recursion_limit; /* recursion limit */
|
|
};
|
|
|
|
// Forward declaration
|
|
static int init_types(struct ast_state *state);
|
|
|
|
static struct ast_state*
|
|
get_ast_state(void)
|
|
{
|
|
PyInterpreterState *interp = _PyInterpreterState_GET();
|
|
struct ast_state *state = &interp->ast;
|
|
assert(!state->finalized);
|
|
if (_PyOnceFlag_CallOnce(&state->once, (_Py_once_fn_t *)&init_types, state) < 0) {
|
|
return NULL;
|
|
}
|
|
return state;
|
|
}
|
|
""").strip(), file=f)
|
|
|
|
generate_ast_fini(module_state, f)
|
|
|
|
f.write('static int init_identifiers(struct ast_state *state)\n')
|
|
f.write('{\n')
|
|
for identifier in state_strings:
|
|
f.write(' if ((state->' + identifier)
|
|
f.write(' = PyUnicode_InternFromString("')
|
|
f.write(identifier + '")) == NULL) return -1;\n')
|
|
f.write(' return 0;\n')
|
|
f.write('};\n\n')
|
|
|
|
def write_header(mod, metadata, f):
|
|
f.write(textwrap.dedent("""
|
|
#ifndef Py_INTERNAL_AST_H
|
|
#define Py_INTERNAL_AST_H
|
|
#ifdef __cplusplus
|
|
extern "C" {
|
|
#endif
|
|
|
|
#ifndef Py_BUILD_CORE
|
|
# error "this header requires Py_BUILD_CORE define"
|
|
#endif
|
|
|
|
#include "pycore_asdl.h" // _ASDL_SEQ_HEAD
|
|
|
|
""").lstrip())
|
|
|
|
c = ChainOfVisitors(
|
|
TypeDefVisitor(f),
|
|
SequenceDefVisitor(f),
|
|
StructVisitor(f),
|
|
metadata=metadata
|
|
)
|
|
c.visit(mod)
|
|
|
|
f.write("// Note: these macros affect function definitions, not only call sites.\n")
|
|
prototype_visitor = PrototypeVisitor(f, metadata=metadata)
|
|
prototype_visitor.visit(mod)
|
|
|
|
f.write(textwrap.dedent("""
|
|
|
|
PyObject* PyAST_mod2obj(mod_ty t);
|
|
mod_ty PyAST_obj2mod(PyObject* ast, PyArena* arena, int mode);
|
|
int PyAST_Check(PyObject* obj);
|
|
|
|
extern int _PyAST_Validate(mod_ty);
|
|
|
|
/* _PyAST_ExprAsUnicode is defined in ast_unparse.c */
|
|
extern PyObject* _PyAST_ExprAsUnicode(expr_ty);
|
|
|
|
/* Return the borrowed reference to the first literal string in the
|
|
sequence of statements or NULL if it doesn't start from a literal string.
|
|
Doesn't set exception. */
|
|
extern PyObject* _PyAST_GetDocString(asdl_stmt_seq *);
|
|
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|
|
#endif /* !Py_INTERNAL_AST_H */
|
|
"""))
|
|
|
|
|
|
def write_internal_h_header(mod, f):
|
|
print(textwrap.dedent("""
|
|
#ifndef Py_INTERNAL_AST_STATE_H
|
|
#define Py_INTERNAL_AST_STATE_H
|
|
|
|
#include "pycore_lock.h" // _PyOnceFlag
|
|
|
|
#ifdef __cplusplus
|
|
extern "C" {
|
|
#endif
|
|
|
|
#ifndef Py_BUILD_CORE
|
|
# error "this header requires Py_BUILD_CORE define"
|
|
#endif
|
|
""").lstrip(), file=f)
|
|
|
|
|
|
def write_internal_h_footer(mod, f):
|
|
print(textwrap.dedent("""
|
|
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|
|
#endif /* !Py_INTERNAL_AST_STATE_H */
|
|
"""), file=f)
|
|
|
|
def write_source(mod, metadata, f, internal_h_file):
|
|
generate_module_def(mod, metadata, f, internal_h_file)
|
|
|
|
v = ChainOfVisitors(
|
|
SequenceConstructorVisitor(f),
|
|
PyTypesDeclareVisitor(f),
|
|
AnnotationsVisitor(f),
|
|
PyTypesVisitor(f),
|
|
Obj2ModPrototypeVisitor(f),
|
|
FunctionVisitor(f),
|
|
ObjVisitor(f),
|
|
Obj2ModVisitor(f),
|
|
ASTModuleVisitor(f),
|
|
PartingShots(f),
|
|
metadata=metadata
|
|
)
|
|
v.visit(mod)
|
|
|
|
def main(input_filename, c_filename, h_filename, internal_h_filename, dump_module=False):
|
|
auto_gen_msg = AUTOGEN_MESSAGE.format("/".join(Path(__file__).parts[-2:]))
|
|
mod = asdl.parse(input_filename)
|
|
if dump_module:
|
|
print('Parsed Module:')
|
|
print(mod)
|
|
if not asdl.check(mod):
|
|
sys.exit(1)
|
|
|
|
metadata_visitor = MetadataVisitor()
|
|
metadata_visitor.visit(mod)
|
|
metadata = metadata_visitor.metadata
|
|
|
|
with c_filename.open("w") as c_file, \
|
|
h_filename.open("w") as h_file, \
|
|
internal_h_filename.open("w") as internal_h_file:
|
|
c_file.write(auto_gen_msg)
|
|
h_file.write(auto_gen_msg)
|
|
internal_h_file.write(auto_gen_msg)
|
|
|
|
write_internal_h_header(mod, internal_h_file)
|
|
write_source(mod, metadata, c_file, internal_h_file)
|
|
write_header(mod, metadata, h_file)
|
|
write_internal_h_footer(mod, internal_h_file)
|
|
|
|
print(f"{c_filename}, {h_filename}, {internal_h_filename} regenerated.")
|
|
|
|
if __name__ == "__main__":
|
|
parser = ArgumentParser()
|
|
parser.add_argument("input_file", type=Path)
|
|
parser.add_argument("-C", "--c-file", type=Path, required=True)
|
|
parser.add_argument("-H", "--h-file", type=Path, required=True)
|
|
parser.add_argument("-I", "--internal-h-file", type=Path, required=True)
|
|
parser.add_argument("-d", "--dump-module", action="store_true")
|
|
|
|
args = parser.parse_args()
|
|
main(args.input_file, args.c_file, args.h_file,
|
|
args.internal_h_file, args.dump_module)
|