1523 lines
46 KiB
Python
1523 lines
46 KiB
Python
import imp
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import os
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import marshal
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import struct
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import sys
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from cStringIO import StringIO
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from compiler import ast, parse, walk, syntax
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from compiler import pyassem, misc, future, symbols
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from compiler.consts import SC_LOCAL, SC_GLOBAL, SC_FREE, SC_CELL
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from compiler.consts import (CO_VARARGS, CO_VARKEYWORDS, CO_NEWLOCALS,
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CO_NESTED, CO_GENERATOR, CO_FUTURE_DIVISION,
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CO_FUTURE_ABSIMPORT, CO_FUTURE_WITH_STATEMENT)
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from compiler.pyassem import TupleArg
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# XXX The version-specific code can go, since this code only works with 2.x.
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# Do we have Python 1.x or Python 2.x?
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try:
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VERSION = sys.version_info[0]
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except AttributeError:
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VERSION = 1
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callfunc_opcode_info = {
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# (Have *args, Have **args) : opcode
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(0,0) : "CALL_FUNCTION",
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(1,0) : "CALL_FUNCTION_VAR",
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(0,1) : "CALL_FUNCTION_KW",
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(1,1) : "CALL_FUNCTION_VAR_KW",
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}
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LOOP = 1
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EXCEPT = 2
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TRY_FINALLY = 3
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END_FINALLY = 4
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def compileFile(filename, display=0):
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f = open(filename, 'U')
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buf = f.read()
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f.close()
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mod = Module(buf, filename)
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try:
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mod.compile(display)
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except SyntaxError:
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raise
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else:
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f = open(filename + "c", "wb")
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mod.dump(f)
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f.close()
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def compile(source, filename, mode, flags=None, dont_inherit=None):
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"""Replacement for builtin compile() function"""
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if flags is not None or dont_inherit is not None:
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raise RuntimeError, "not implemented yet"
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if mode == "single":
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gen = Interactive(source, filename)
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elif mode == "exec":
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gen = Module(source, filename)
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elif mode == "eval":
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gen = Expression(source, filename)
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else:
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raise ValueError("compile() 3rd arg must be 'exec' or "
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"'eval' or 'single'")
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gen.compile()
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return gen.code
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class AbstractCompileMode:
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mode = None # defined by subclass
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def __init__(self, source, filename):
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self.source = source
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self.filename = filename
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self.code = None
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def _get_tree(self):
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tree = parse(self.source, self.mode)
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misc.set_filename(self.filename, tree)
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syntax.check(tree)
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return tree
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def compile(self):
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pass # implemented by subclass
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def getCode(self):
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return self.code
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class Expression(AbstractCompileMode):
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mode = "eval"
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def compile(self):
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tree = self._get_tree()
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gen = ExpressionCodeGenerator(tree)
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self.code = gen.getCode()
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class Interactive(AbstractCompileMode):
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mode = "single"
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def compile(self):
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tree = self._get_tree()
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gen = InteractiveCodeGenerator(tree)
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self.code = gen.getCode()
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class Module(AbstractCompileMode):
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mode = "exec"
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def compile(self, display=0):
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tree = self._get_tree()
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gen = ModuleCodeGenerator(tree)
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if display:
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import pprint
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print pprint.pprint(tree)
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self.code = gen.getCode()
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def dump(self, f):
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f.write(self.getPycHeader())
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marshal.dump(self.code, f)
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MAGIC = imp.get_magic()
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def getPycHeader(self):
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# compile.c uses marshal to write a long directly, with
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# calling the interface that would also generate a 1-byte code
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# to indicate the type of the value. simplest way to get the
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# same effect is to call marshal and then skip the code.
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mtime = os.path.getmtime(self.filename)
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mtime = struct.pack('<i', mtime)
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return self.MAGIC + mtime
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class LocalNameFinder:
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"""Find local names in scope"""
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def __init__(self, names=()):
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self.names = misc.Set()
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self.globals = misc.Set()
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for name in names:
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self.names.add(name)
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# XXX list comprehensions and for loops
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def getLocals(self):
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for elt in self.globals.elements():
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if self.names.has_elt(elt):
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self.names.remove(elt)
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return self.names
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def visitDict(self, node):
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pass
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def visitGlobal(self, node):
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for name in node.names:
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self.globals.add(name)
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def visitFunction(self, node):
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self.names.add(node.name)
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def visitLambda(self, node):
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pass
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def visitImport(self, node):
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for name, alias in node.names:
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self.names.add(alias or name)
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def visitFrom(self, node):
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for name, alias in node.names:
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self.names.add(alias or name)
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def visitClass(self, node):
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self.names.add(node.name)
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def visitAssName(self, node):
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self.names.add(node.name)
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def is_constant_false(node):
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if isinstance(node, ast.Const):
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if not node.value:
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return 1
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return 0
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class CodeGenerator:
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"""Defines basic code generator for Python bytecode
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This class is an abstract base class. Concrete subclasses must
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define an __init__() that defines self.graph and then calls the
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__init__() defined in this class.
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The concrete class must also define the class attributes
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NameFinder, FunctionGen, and ClassGen. These attributes can be
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defined in the initClass() method, which is a hook for
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initializing these methods after all the classes have been
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defined.
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"""
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optimized = 0 # is namespace access optimized?
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__initialized = None
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class_name = None # provide default for instance variable
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def __init__(self):
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if self.__initialized is None:
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self.initClass()
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self.__class__.__initialized = 1
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self.checkClass()
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self.locals = misc.Stack()
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self.setups = misc.Stack()
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self.last_lineno = None
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self._setupGraphDelegation()
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self._div_op = "BINARY_DIVIDE"
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# XXX set flags based on future features
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futures = self.get_module().futures
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for feature in futures:
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if feature == "division":
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self.graph.setFlag(CO_FUTURE_DIVISION)
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self._div_op = "BINARY_TRUE_DIVIDE"
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elif feature == "absolute_import":
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self.graph.setFlag(CO_FUTURE_ABSIMPORT)
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elif feature == "with_statement":
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self.graph.setFlag(CO_FUTURE_WITH_STATEMENT)
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def initClass(self):
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"""This method is called once for each class"""
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def checkClass(self):
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"""Verify that class is constructed correctly"""
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try:
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assert hasattr(self, 'graph')
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assert getattr(self, 'NameFinder')
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assert getattr(self, 'FunctionGen')
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assert getattr(self, 'ClassGen')
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except AssertionError, msg:
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intro = "Bad class construction for %s" % self.__class__.__name__
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raise AssertionError, intro
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def _setupGraphDelegation(self):
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self.emit = self.graph.emit
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self.newBlock = self.graph.newBlock
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self.startBlock = self.graph.startBlock
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self.nextBlock = self.graph.nextBlock
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self.setDocstring = self.graph.setDocstring
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def getCode(self):
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"""Return a code object"""
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return self.graph.getCode()
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def mangle(self, name):
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if self.class_name is not None:
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return misc.mangle(name, self.class_name)
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else:
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return name
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def parseSymbols(self, tree):
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s = symbols.SymbolVisitor()
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walk(tree, s)
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return s.scopes
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def get_module(self):
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raise RuntimeError, "should be implemented by subclasses"
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# Next five methods handle name access
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def isLocalName(self, name):
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return self.locals.top().has_elt(name)
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def storeName(self, name):
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self._nameOp('STORE', name)
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def loadName(self, name):
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self._nameOp('LOAD', name)
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def delName(self, name):
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self._nameOp('DELETE', name)
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def _nameOp(self, prefix, name):
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name = self.mangle(name)
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scope = self.scope.check_name(name)
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if scope == SC_LOCAL:
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if not self.optimized:
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self.emit(prefix + '_NAME', name)
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else:
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self.emit(prefix + '_FAST', name)
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elif scope == SC_GLOBAL:
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if not self.optimized:
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self.emit(prefix + '_NAME', name)
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else:
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self.emit(prefix + '_GLOBAL', name)
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elif scope == SC_FREE or scope == SC_CELL:
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self.emit(prefix + '_DEREF', name)
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else:
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raise RuntimeError, "unsupported scope for var %s: %d" % \
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(name, scope)
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def _implicitNameOp(self, prefix, name):
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"""Emit name ops for names generated implicitly by for loops
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The interpreter generates names that start with a period or
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dollar sign. The symbol table ignores these names because
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they aren't present in the program text.
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"""
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if self.optimized:
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self.emit(prefix + '_FAST', name)
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else:
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self.emit(prefix + '_NAME', name)
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# The set_lineno() function and the explicit emit() calls for
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# SET_LINENO below are only used to generate the line number table.
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# As of Python 2.3, the interpreter does not have a SET_LINENO
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# instruction. pyassem treats SET_LINENO opcodes as a special case.
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def set_lineno(self, node, force=False):
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"""Emit SET_LINENO if necessary.
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The instruction is considered necessary if the node has a
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lineno attribute and it is different than the last lineno
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emitted.
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Returns true if SET_LINENO was emitted.
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There are no rules for when an AST node should have a lineno
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attribute. The transformer and AST code need to be reviewed
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and a consistent policy implemented and documented. Until
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then, this method works around missing line numbers.
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"""
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lineno = getattr(node, 'lineno', None)
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if lineno is not None and (lineno != self.last_lineno
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or force):
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self.emit('SET_LINENO', lineno)
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self.last_lineno = lineno
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return True
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return False
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# The first few visitor methods handle nodes that generator new
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# code objects. They use class attributes to determine what
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# specialized code generators to use.
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NameFinder = LocalNameFinder
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FunctionGen = None
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ClassGen = None
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def visitModule(self, node):
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self.scopes = self.parseSymbols(node)
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self.scope = self.scopes[node]
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self.emit('SET_LINENO', 0)
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if node.doc:
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self.emit('LOAD_CONST', node.doc)
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self.storeName('__doc__')
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lnf = walk(node.node, self.NameFinder(), verbose=0)
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self.locals.push(lnf.getLocals())
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self.visit(node.node)
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self.emit('LOAD_CONST', None)
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self.emit('RETURN_VALUE')
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def visitExpression(self, node):
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self.set_lineno(node)
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self.scopes = self.parseSymbols(node)
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self.scope = self.scopes[node]
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self.visit(node.node)
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self.emit('RETURN_VALUE')
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def visitFunction(self, node):
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self._visitFuncOrLambda(node, isLambda=0)
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if node.doc:
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self.setDocstring(node.doc)
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self.storeName(node.name)
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def visitLambda(self, node):
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self._visitFuncOrLambda(node, isLambda=1)
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def _visitFuncOrLambda(self, node, isLambda=0):
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if not isLambda and node.decorators:
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for decorator in node.decorators.nodes:
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self.visit(decorator)
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ndecorators = len(node.decorators.nodes)
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else:
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ndecorators = 0
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gen = self.FunctionGen(node, self.scopes, isLambda,
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self.class_name, self.get_module())
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walk(node.code, gen)
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gen.finish()
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self.set_lineno(node)
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for default in node.defaults:
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self.visit(default)
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self._makeClosure(gen, len(node.defaults))
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for i in range(ndecorators):
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self.emit('CALL_FUNCTION', 1)
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def visitClass(self, node):
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gen = self.ClassGen(node, self.scopes,
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self.get_module())
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walk(node.code, gen)
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gen.finish()
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self.set_lineno(node)
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self.emit('LOAD_CONST', node.name)
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for base in node.bases:
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self.visit(base)
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self.emit('BUILD_TUPLE', len(node.bases))
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self._makeClosure(gen, 0)
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self.emit('CALL_FUNCTION', 0)
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self.emit('BUILD_CLASS')
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self.storeName(node.name)
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# The rest are standard visitor methods
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# The next few implement control-flow statements
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def visitIf(self, node):
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end = self.newBlock()
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numtests = len(node.tests)
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for i in range(numtests):
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test, suite = node.tests[i]
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if is_constant_false(test):
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# XXX will need to check generator stuff here
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continue
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self.set_lineno(test)
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self.visit(test)
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nextTest = self.newBlock()
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self.emit('JUMP_IF_FALSE', nextTest)
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self.nextBlock()
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self.emit('POP_TOP')
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self.visit(suite)
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self.emit('JUMP_FORWARD', end)
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self.startBlock(nextTest)
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self.emit('POP_TOP')
|
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if node.else_:
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self.visit(node.else_)
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self.nextBlock(end)
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def visitWhile(self, node):
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self.set_lineno(node)
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loop = self.newBlock()
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else_ = self.newBlock()
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after = self.newBlock()
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self.emit('SETUP_LOOP', after)
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self.nextBlock(loop)
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self.setups.push((LOOP, loop))
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self.set_lineno(node, force=True)
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self.visit(node.test)
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self.emit('JUMP_IF_FALSE', else_ or after)
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|
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self.nextBlock()
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self.emit('POP_TOP')
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self.visit(node.body)
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self.emit('JUMP_ABSOLUTE', loop)
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self.startBlock(else_) # or just the POPs if not else clause
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self.emit('POP_TOP')
|
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self.emit('POP_BLOCK')
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self.setups.pop()
|
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if node.else_:
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self.visit(node.else_)
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self.nextBlock(after)
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|
|
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def visitFor(self, node):
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start = self.newBlock()
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anchor = self.newBlock()
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after = self.newBlock()
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self.setups.push((LOOP, start))
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|
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self.set_lineno(node)
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self.emit('SETUP_LOOP', after)
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self.visit(node.list)
|
|
self.emit('GET_ITER')
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|
|
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self.nextBlock(start)
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self.set_lineno(node, force=1)
|
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self.emit('FOR_ITER', anchor)
|
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self.visit(node.assign)
|
|
self.visit(node.body)
|
|
self.emit('JUMP_ABSOLUTE', start)
|
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self.nextBlock(anchor)
|
|
self.emit('POP_BLOCK')
|
|
self.setups.pop()
|
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if node.else_:
|
|
self.visit(node.else_)
|
|
self.nextBlock(after)
|
|
|
|
def visitBreak(self, node):
|
|
if not self.setups:
|
|
raise SyntaxError, "'break' outside loop (%s, %d)" % \
|
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(node.filename, node.lineno)
|
|
self.set_lineno(node)
|
|
self.emit('BREAK_LOOP')
|
|
|
|
def visitContinue(self, node):
|
|
if not self.setups:
|
|
raise SyntaxError, "'continue' outside loop (%s, %d)" % \
|
|
(node.filename, node.lineno)
|
|
kind, block = self.setups.top()
|
|
if kind == LOOP:
|
|
self.set_lineno(node)
|
|
self.emit('JUMP_ABSOLUTE', block)
|
|
self.nextBlock()
|
|
elif kind == EXCEPT or kind == TRY_FINALLY:
|
|
self.set_lineno(node)
|
|
# find the block that starts the loop
|
|
top = len(self.setups)
|
|
while top > 0:
|
|
top = top - 1
|
|
kind, loop_block = self.setups[top]
|
|
if kind == LOOP:
|
|
break
|
|
if kind != LOOP:
|
|
raise SyntaxError, "'continue' outside loop (%s, %d)" % \
|
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(node.filename, node.lineno)
|
|
self.emit('CONTINUE_LOOP', loop_block)
|
|
self.nextBlock()
|
|
elif kind == END_FINALLY:
|
|
msg = "'continue' not allowed inside 'finally' clause (%s, %d)"
|
|
raise SyntaxError, msg % (node.filename, node.lineno)
|
|
|
|
def visitTest(self, node, jump):
|
|
end = self.newBlock()
|
|
for child in node.nodes[:-1]:
|
|
self.visit(child)
|
|
self.emit(jump, end)
|
|
self.nextBlock()
|
|
self.emit('POP_TOP')
|
|
self.visit(node.nodes[-1])
|
|
self.nextBlock(end)
|
|
|
|
def visitAnd(self, node):
|
|
self.visitTest(node, 'JUMP_IF_FALSE')
|
|
|
|
def visitOr(self, node):
|
|
self.visitTest(node, 'JUMP_IF_TRUE')
|
|
|
|
def visitIfExp(self, node):
|
|
endblock = self.newBlock()
|
|
elseblock = self.newBlock()
|
|
self.visit(node.test)
|
|
self.emit('JUMP_IF_FALSE', elseblock)
|
|
self.emit('POP_TOP')
|
|
self.visit(node.then)
|
|
self.emit('JUMP_FORWARD', endblock)
|
|
self.nextBlock(elseblock)
|
|
self.emit('POP_TOP')
|
|
self.visit(node.else_)
|
|
self.nextBlock(endblock)
|
|
|
|
def visitCompare(self, node):
|
|
self.visit(node.expr)
|
|
cleanup = self.newBlock()
|
|
for op, code in node.ops[:-1]:
|
|
self.visit(code)
|
|
self.emit('DUP_TOP')
|
|
self.emit('ROT_THREE')
|
|
self.emit('COMPARE_OP', op)
|
|
self.emit('JUMP_IF_FALSE', cleanup)
|
|
self.nextBlock()
|
|
self.emit('POP_TOP')
|
|
# now do the last comparison
|
|
if node.ops:
|
|
op, code = node.ops[-1]
|
|
self.visit(code)
|
|
self.emit('COMPARE_OP', op)
|
|
if len(node.ops) > 1:
|
|
end = self.newBlock()
|
|
self.emit('JUMP_FORWARD', end)
|
|
self.startBlock(cleanup)
|
|
self.emit('ROT_TWO')
|
|
self.emit('POP_TOP')
|
|
self.nextBlock(end)
|
|
|
|
# list comprehensions
|
|
__list_count = 0
|
|
|
|
def visitListComp(self, node):
|
|
self.set_lineno(node)
|
|
# setup list
|
|
append = "$append%d" % self.__list_count
|
|
self.__list_count = self.__list_count + 1
|
|
self.emit('BUILD_LIST', 0)
|
|
self.emit('DUP_TOP')
|
|
self.emit('LOAD_ATTR', 'append')
|
|
self._implicitNameOp('STORE', append)
|
|
|
|
stack = []
|
|
for i, for_ in zip(range(len(node.quals)), node.quals):
|
|
start, anchor = self.visit(for_)
|
|
cont = None
|
|
for if_ in for_.ifs:
|
|
if cont is None:
|
|
cont = self.newBlock()
|
|
self.visit(if_, cont)
|
|
stack.insert(0, (start, cont, anchor))
|
|
|
|
self._implicitNameOp('LOAD', append)
|
|
self.visit(node.expr)
|
|
self.emit('CALL_FUNCTION', 1)
|
|
self.emit('POP_TOP')
|
|
|
|
for start, cont, anchor in stack:
|
|
if cont:
|
|
skip_one = self.newBlock()
|
|
self.emit('JUMP_FORWARD', skip_one)
|
|
self.startBlock(cont)
|
|
self.emit('POP_TOP')
|
|
self.nextBlock(skip_one)
|
|
self.emit('JUMP_ABSOLUTE', start)
|
|
self.startBlock(anchor)
|
|
self._implicitNameOp('DELETE', append)
|
|
|
|
self.__list_count = self.__list_count - 1
|
|
|
|
def visitListCompFor(self, node):
|
|
start = self.newBlock()
|
|
anchor = self.newBlock()
|
|
|
|
self.visit(node.list)
|
|
self.emit('GET_ITER')
|
|
self.nextBlock(start)
|
|
self.set_lineno(node, force=True)
|
|
self.emit('FOR_ITER', anchor)
|
|
self.nextBlock()
|
|
self.visit(node.assign)
|
|
return start, anchor
|
|
|
|
def visitListCompIf(self, node, branch):
|
|
self.set_lineno(node, force=True)
|
|
self.visit(node.test)
|
|
self.emit('JUMP_IF_FALSE', branch)
|
|
self.newBlock()
|
|
self.emit('POP_TOP')
|
|
|
|
def _makeClosure(self, gen, args):
|
|
frees = gen.scope.get_free_vars()
|
|
if frees:
|
|
for name in frees:
|
|
self.emit('LOAD_CLOSURE', name)
|
|
self.emit('BUILD_TUPLE', len(frees))
|
|
self.emit('LOAD_CONST', gen)
|
|
self.emit('MAKE_CLOSURE', args)
|
|
else:
|
|
self.emit('LOAD_CONST', gen)
|
|
self.emit('MAKE_FUNCTION', args)
|
|
|
|
def visitGenExpr(self, node):
|
|
gen = GenExprCodeGenerator(node, self.scopes, self.class_name,
|
|
self.get_module())
|
|
walk(node.code, gen)
|
|
gen.finish()
|
|
self.set_lineno(node)
|
|
self._makeClosure(gen, 0)
|
|
# precomputation of outmost iterable
|
|
self.visit(node.code.quals[0].iter)
|
|
self.emit('GET_ITER')
|
|
self.emit('CALL_FUNCTION', 1)
|
|
|
|
def visitGenExprInner(self, node):
|
|
self.set_lineno(node)
|
|
# setup list
|
|
|
|
stack = []
|
|
for i, for_ in zip(range(len(node.quals)), node.quals):
|
|
start, anchor = self.visit(for_)
|
|
cont = None
|
|
for if_ in for_.ifs:
|
|
if cont is None:
|
|
cont = self.newBlock()
|
|
self.visit(if_, cont)
|
|
stack.insert(0, (start, cont, anchor))
|
|
|
|
self.visit(node.expr)
|
|
self.emit('YIELD_VALUE')
|
|
|
|
for start, cont, anchor in stack:
|
|
if cont:
|
|
skip_one = self.newBlock()
|
|
self.emit('JUMP_FORWARD', skip_one)
|
|
self.startBlock(cont)
|
|
self.emit('POP_TOP')
|
|
self.nextBlock(skip_one)
|
|
self.emit('JUMP_ABSOLUTE', start)
|
|
self.startBlock(anchor)
|
|
self.emit('LOAD_CONST', None)
|
|
|
|
def visitGenExprFor(self, node):
|
|
start = self.newBlock()
|
|
anchor = self.newBlock()
|
|
|
|
if node.is_outmost:
|
|
self.loadName('[outmost-iterable]')
|
|
else:
|
|
self.visit(node.iter)
|
|
self.emit('GET_ITER')
|
|
|
|
self.nextBlock(start)
|
|
self.set_lineno(node, force=True)
|
|
self.emit('FOR_ITER', anchor)
|
|
self.nextBlock()
|
|
self.visit(node.assign)
|
|
return start, anchor
|
|
|
|
def visitGenExprIf(self, node, branch):
|
|
self.set_lineno(node, force=True)
|
|
self.visit(node.test)
|
|
self.emit('JUMP_IF_FALSE', branch)
|
|
self.newBlock()
|
|
self.emit('POP_TOP')
|
|
|
|
# exception related
|
|
|
|
def visitAssert(self, node):
|
|
# XXX would be interesting to implement this via a
|
|
# transformation of the AST before this stage
|
|
if __debug__:
|
|
end = self.newBlock()
|
|
self.set_lineno(node)
|
|
# XXX AssertionError appears to be special case -- it is always
|
|
# loaded as a global even if there is a local name. I guess this
|
|
# is a sort of renaming op.
|
|
self.nextBlock()
|
|
self.visit(node.test)
|
|
self.emit('JUMP_IF_TRUE', end)
|
|
self.nextBlock()
|
|
self.emit('POP_TOP')
|
|
self.emit('LOAD_GLOBAL', 'AssertionError')
|
|
if node.fail:
|
|
self.visit(node.fail)
|
|
self.emit('RAISE_VARARGS', 2)
|
|
else:
|
|
self.emit('RAISE_VARARGS', 1)
|
|
self.nextBlock(end)
|
|
self.emit('POP_TOP')
|
|
|
|
def visitRaise(self, node):
|
|
self.set_lineno(node)
|
|
n = 0
|
|
if node.expr1:
|
|
self.visit(node.expr1)
|
|
n = n + 1
|
|
if node.expr2:
|
|
self.visit(node.expr2)
|
|
n = n + 1
|
|
if node.expr3:
|
|
self.visit(node.expr3)
|
|
n = n + 1
|
|
self.emit('RAISE_VARARGS', n)
|
|
|
|
def visitTryExcept(self, node):
|
|
body = self.newBlock()
|
|
handlers = self.newBlock()
|
|
end = self.newBlock()
|
|
if node.else_:
|
|
lElse = self.newBlock()
|
|
else:
|
|
lElse = end
|
|
self.set_lineno(node)
|
|
self.emit('SETUP_EXCEPT', handlers)
|
|
self.nextBlock(body)
|
|
self.setups.push((EXCEPT, body))
|
|
self.visit(node.body)
|
|
self.emit('POP_BLOCK')
|
|
self.setups.pop()
|
|
self.emit('JUMP_FORWARD', lElse)
|
|
self.startBlock(handlers)
|
|
|
|
last = len(node.handlers) - 1
|
|
for i in range(len(node.handlers)):
|
|
expr, target, body = node.handlers[i]
|
|
self.set_lineno(expr)
|
|
if expr:
|
|
self.emit('DUP_TOP')
|
|
self.visit(expr)
|
|
self.emit('COMPARE_OP', 'exception match')
|
|
next = self.newBlock()
|
|
self.emit('JUMP_IF_FALSE', next)
|
|
self.nextBlock()
|
|
self.emit('POP_TOP')
|
|
self.emit('POP_TOP')
|
|
if target:
|
|
self.visit(target)
|
|
else:
|
|
self.emit('POP_TOP')
|
|
self.emit('POP_TOP')
|
|
self.visit(body)
|
|
self.emit('JUMP_FORWARD', end)
|
|
if expr:
|
|
self.nextBlock(next)
|
|
else:
|
|
self.nextBlock()
|
|
if expr: # XXX
|
|
self.emit('POP_TOP')
|
|
self.emit('END_FINALLY')
|
|
if node.else_:
|
|
self.nextBlock(lElse)
|
|
self.visit(node.else_)
|
|
self.nextBlock(end)
|
|
|
|
def visitTryFinally(self, node):
|
|
body = self.newBlock()
|
|
final = self.newBlock()
|
|
self.set_lineno(node)
|
|
self.emit('SETUP_FINALLY', final)
|
|
self.nextBlock(body)
|
|
self.setups.push((TRY_FINALLY, body))
|
|
self.visit(node.body)
|
|
self.emit('POP_BLOCK')
|
|
self.setups.pop()
|
|
self.emit('LOAD_CONST', None)
|
|
self.nextBlock(final)
|
|
self.setups.push((END_FINALLY, final))
|
|
self.visit(node.final)
|
|
self.emit('END_FINALLY')
|
|
self.setups.pop()
|
|
|
|
__with_count = 0
|
|
|
|
def visitWith(self, node):
|
|
body = self.newBlock()
|
|
final = self.newBlock()
|
|
exitvar = "$exit%d" % self.__with_count
|
|
valuevar = "$value%d" % self.__with_count
|
|
self.__with_count += 1
|
|
self.set_lineno(node)
|
|
self.visit(node.expr)
|
|
self.emit('DUP_TOP')
|
|
self.emit('LOAD_ATTR', '__exit__')
|
|
self._implicitNameOp('STORE', exitvar)
|
|
self.emit('LOAD_ATTR', '__enter__')
|
|
self.emit('CALL_FUNCTION', 0)
|
|
if node.vars is None:
|
|
self.emit('POP_TOP')
|
|
else:
|
|
self._implicitNameOp('STORE', valuevar)
|
|
self.emit('SETUP_FINALLY', final)
|
|
self.nextBlock(body)
|
|
self.setups.push((TRY_FINALLY, body))
|
|
if node.vars is not None:
|
|
self._implicitNameOp('LOAD', valuevar)
|
|
self._implicitNameOp('DELETE', valuevar)
|
|
self.visit(node.vars)
|
|
self.visit(node.body)
|
|
self.emit('POP_BLOCK')
|
|
self.setups.pop()
|
|
self.emit('LOAD_CONST', None)
|
|
self.nextBlock(final)
|
|
self.setups.push((END_FINALLY, final))
|
|
self.emit('WITH_CLEANUP')
|
|
self.emit('END_FINALLY')
|
|
self.setups.pop()
|
|
self.__with_count -= 1
|
|
|
|
# misc
|
|
|
|
def visitDiscard(self, node):
|
|
self.set_lineno(node)
|
|
self.visit(node.expr)
|
|
self.emit('POP_TOP')
|
|
|
|
def visitConst(self, node):
|
|
self.emit('LOAD_CONST', node.value)
|
|
|
|
def visitKeyword(self, node):
|
|
self.emit('LOAD_CONST', node.name)
|
|
self.visit(node.expr)
|
|
|
|
def visitGlobal(self, node):
|
|
# no code to generate
|
|
pass
|
|
|
|
def visitName(self, node):
|
|
self.set_lineno(node)
|
|
self.loadName(node.name)
|
|
|
|
def visitPass(self, node):
|
|
self.set_lineno(node)
|
|
|
|
def visitImport(self, node):
|
|
self.set_lineno(node)
|
|
level = 0 if self.graph.checkFlag(CO_FUTURE_ABSIMPORT) else -1
|
|
for name, alias in node.names:
|
|
if VERSION > 1:
|
|
self.emit('LOAD_CONST', level)
|
|
self.emit('LOAD_CONST', None)
|
|
self.emit('IMPORT_NAME', name)
|
|
mod = name.split(".")[0]
|
|
if alias:
|
|
self._resolveDots(name)
|
|
self.storeName(alias)
|
|
else:
|
|
self.storeName(mod)
|
|
|
|
def visitFrom(self, node):
|
|
self.set_lineno(node)
|
|
level = node.level
|
|
if level == 0 and not self.graph.checkFlag(CO_FUTURE_ABSIMPORT):
|
|
level = -1
|
|
fromlist = map(lambda (name, alias): name, node.names)
|
|
if VERSION > 1:
|
|
self.emit('LOAD_CONST', level)
|
|
self.emit('LOAD_CONST', tuple(fromlist))
|
|
self.emit('IMPORT_NAME', node.modname)
|
|
for name, alias in node.names:
|
|
if VERSION > 1:
|
|
if name == '*':
|
|
self.namespace = 0
|
|
self.emit('IMPORT_STAR')
|
|
# There can only be one name w/ from ... import *
|
|
assert len(node.names) == 1
|
|
return
|
|
else:
|
|
self.emit('IMPORT_FROM', name)
|
|
self._resolveDots(name)
|
|
self.storeName(alias or name)
|
|
else:
|
|
self.emit('IMPORT_FROM', name)
|
|
self.emit('POP_TOP')
|
|
|
|
def _resolveDots(self, name):
|
|
elts = name.split(".")
|
|
if len(elts) == 1:
|
|
return
|
|
for elt in elts[1:]:
|
|
self.emit('LOAD_ATTR', elt)
|
|
|
|
def visitGetattr(self, node):
|
|
self.visit(node.expr)
|
|
self.emit('LOAD_ATTR', self.mangle(node.attrname))
|
|
|
|
# next five implement assignments
|
|
|
|
def visitAssign(self, node):
|
|
self.set_lineno(node)
|
|
self.visit(node.expr)
|
|
dups = len(node.nodes) - 1
|
|
for i in range(len(node.nodes)):
|
|
elt = node.nodes[i]
|
|
if i < dups:
|
|
self.emit('DUP_TOP')
|
|
if isinstance(elt, ast.Node):
|
|
self.visit(elt)
|
|
|
|
def visitAssName(self, node):
|
|
if node.flags == 'OP_ASSIGN':
|
|
self.storeName(node.name)
|
|
elif node.flags == 'OP_DELETE':
|
|
self.set_lineno(node)
|
|
self.delName(node.name)
|
|
else:
|
|
print "oops", node.flags
|
|
|
|
def visitAssAttr(self, node):
|
|
self.visit(node.expr)
|
|
if node.flags == 'OP_ASSIGN':
|
|
self.emit('STORE_ATTR', self.mangle(node.attrname))
|
|
elif node.flags == 'OP_DELETE':
|
|
self.emit('DELETE_ATTR', self.mangle(node.attrname))
|
|
else:
|
|
print "warning: unexpected flags:", node.flags
|
|
print node
|
|
|
|
def _visitAssSequence(self, node, op='UNPACK_SEQUENCE'):
|
|
if findOp(node) != 'OP_DELETE':
|
|
self.emit(op, len(node.nodes))
|
|
for child in node.nodes:
|
|
self.visit(child)
|
|
|
|
if VERSION > 1:
|
|
visitAssTuple = _visitAssSequence
|
|
visitAssList = _visitAssSequence
|
|
else:
|
|
def visitAssTuple(self, node):
|
|
self._visitAssSequence(node, 'UNPACK_TUPLE')
|
|
|
|
def visitAssList(self, node):
|
|
self._visitAssSequence(node, 'UNPACK_LIST')
|
|
|
|
# augmented assignment
|
|
|
|
def visitAugAssign(self, node):
|
|
self.set_lineno(node)
|
|
aug_node = wrap_aug(node.node)
|
|
self.visit(aug_node, "load")
|
|
self.visit(node.expr)
|
|
self.emit(self._augmented_opcode[node.op])
|
|
self.visit(aug_node, "store")
|
|
|
|
_augmented_opcode = {
|
|
'+=' : 'INPLACE_ADD',
|
|
'-=' : 'INPLACE_SUBTRACT',
|
|
'*=' : 'INPLACE_MULTIPLY',
|
|
'/=' : 'INPLACE_DIVIDE',
|
|
'//=': 'INPLACE_FLOOR_DIVIDE',
|
|
'%=' : 'INPLACE_MODULO',
|
|
'**=': 'INPLACE_POWER',
|
|
'>>=': 'INPLACE_RSHIFT',
|
|
'<<=': 'INPLACE_LSHIFT',
|
|
'&=' : 'INPLACE_AND',
|
|
'^=' : 'INPLACE_XOR',
|
|
'|=' : 'INPLACE_OR',
|
|
}
|
|
|
|
def visitAugName(self, node, mode):
|
|
if mode == "load":
|
|
self.loadName(node.name)
|
|
elif mode == "store":
|
|
self.storeName(node.name)
|
|
|
|
def visitAugGetattr(self, node, mode):
|
|
if mode == "load":
|
|
self.visit(node.expr)
|
|
self.emit('DUP_TOP')
|
|
self.emit('LOAD_ATTR', self.mangle(node.attrname))
|
|
elif mode == "store":
|
|
self.emit('ROT_TWO')
|
|
self.emit('STORE_ATTR', self.mangle(node.attrname))
|
|
|
|
def visitAugSlice(self, node, mode):
|
|
if mode == "load":
|
|
self.visitSlice(node, 1)
|
|
elif mode == "store":
|
|
slice = 0
|
|
if node.lower:
|
|
slice = slice | 1
|
|
if node.upper:
|
|
slice = slice | 2
|
|
if slice == 0:
|
|
self.emit('ROT_TWO')
|
|
elif slice == 3:
|
|
self.emit('ROT_FOUR')
|
|
else:
|
|
self.emit('ROT_THREE')
|
|
self.emit('STORE_SLICE+%d' % slice)
|
|
|
|
def visitAugSubscript(self, node, mode):
|
|
if mode == "load":
|
|
self.visitSubscript(node, 1)
|
|
elif mode == "store":
|
|
self.emit('ROT_THREE')
|
|
self.emit('STORE_SUBSCR')
|
|
|
|
def visitExec(self, node):
|
|
self.visit(node.expr)
|
|
if node.locals is None:
|
|
self.emit('LOAD_CONST', None)
|
|
else:
|
|
self.visit(node.locals)
|
|
if node.globals is None:
|
|
self.emit('DUP_TOP')
|
|
else:
|
|
self.visit(node.globals)
|
|
self.emit('EXEC_STMT')
|
|
|
|
def visitCallFunc(self, node):
|
|
pos = 0
|
|
kw = 0
|
|
self.set_lineno(node)
|
|
self.visit(node.node)
|
|
for arg in node.args:
|
|
self.visit(arg)
|
|
if isinstance(arg, ast.Keyword):
|
|
kw = kw + 1
|
|
else:
|
|
pos = pos + 1
|
|
if node.star_args is not None:
|
|
self.visit(node.star_args)
|
|
if node.dstar_args is not None:
|
|
self.visit(node.dstar_args)
|
|
have_star = node.star_args is not None
|
|
have_dstar = node.dstar_args is not None
|
|
opcode = callfunc_opcode_info[have_star, have_dstar]
|
|
self.emit(opcode, kw << 8 | pos)
|
|
|
|
def visitPrint(self, node, newline=0):
|
|
self.set_lineno(node)
|
|
if node.dest:
|
|
self.visit(node.dest)
|
|
for child in node.nodes:
|
|
if node.dest:
|
|
self.emit('DUP_TOP')
|
|
self.visit(child)
|
|
if node.dest:
|
|
self.emit('ROT_TWO')
|
|
self.emit('PRINT_ITEM_TO')
|
|
else:
|
|
self.emit('PRINT_ITEM')
|
|
if node.dest and not newline:
|
|
self.emit('POP_TOP')
|
|
|
|
def visitPrintnl(self, node):
|
|
self.visitPrint(node, newline=1)
|
|
if node.dest:
|
|
self.emit('PRINT_NEWLINE_TO')
|
|
else:
|
|
self.emit('PRINT_NEWLINE')
|
|
|
|
def visitReturn(self, node):
|
|
self.set_lineno(node)
|
|
self.visit(node.value)
|
|
self.emit('RETURN_VALUE')
|
|
|
|
def visitYield(self, node):
|
|
self.set_lineno(node)
|
|
self.visit(node.value)
|
|
self.emit('YIELD_VALUE')
|
|
|
|
# slice and subscript stuff
|
|
|
|
def visitSlice(self, node, aug_flag=None):
|
|
# aug_flag is used by visitAugSlice
|
|
self.visit(node.expr)
|
|
slice = 0
|
|
if node.lower:
|
|
self.visit(node.lower)
|
|
slice = slice | 1
|
|
if node.upper:
|
|
self.visit(node.upper)
|
|
slice = slice | 2
|
|
if aug_flag:
|
|
if slice == 0:
|
|
self.emit('DUP_TOP')
|
|
elif slice == 3:
|
|
self.emit('DUP_TOPX', 3)
|
|
else:
|
|
self.emit('DUP_TOPX', 2)
|
|
if node.flags == 'OP_APPLY':
|
|
self.emit('SLICE+%d' % slice)
|
|
elif node.flags == 'OP_ASSIGN':
|
|
self.emit('STORE_SLICE+%d' % slice)
|
|
elif node.flags == 'OP_DELETE':
|
|
self.emit('DELETE_SLICE+%d' % slice)
|
|
else:
|
|
print "weird slice", node.flags
|
|
raise
|
|
|
|
def visitSubscript(self, node, aug_flag=None):
|
|
self.visit(node.expr)
|
|
for sub in node.subs:
|
|
self.visit(sub)
|
|
if len(node.subs) > 1:
|
|
self.emit('BUILD_TUPLE', len(node.subs))
|
|
if aug_flag:
|
|
self.emit('DUP_TOPX', 2)
|
|
if node.flags == 'OP_APPLY':
|
|
self.emit('BINARY_SUBSCR')
|
|
elif node.flags == 'OP_ASSIGN':
|
|
self.emit('STORE_SUBSCR')
|
|
elif node.flags == 'OP_DELETE':
|
|
self.emit('DELETE_SUBSCR')
|
|
|
|
# binary ops
|
|
|
|
def binaryOp(self, node, op):
|
|
self.visit(node.left)
|
|
self.visit(node.right)
|
|
self.emit(op)
|
|
|
|
def visitAdd(self, node):
|
|
return self.binaryOp(node, 'BINARY_ADD')
|
|
|
|
def visitSub(self, node):
|
|
return self.binaryOp(node, 'BINARY_SUBTRACT')
|
|
|
|
def visitMul(self, node):
|
|
return self.binaryOp(node, 'BINARY_MULTIPLY')
|
|
|
|
def visitDiv(self, node):
|
|
return self.binaryOp(node, self._div_op)
|
|
|
|
def visitFloorDiv(self, node):
|
|
return self.binaryOp(node, 'BINARY_FLOOR_DIVIDE')
|
|
|
|
def visitMod(self, node):
|
|
return self.binaryOp(node, 'BINARY_MODULO')
|
|
|
|
def visitPower(self, node):
|
|
return self.binaryOp(node, 'BINARY_POWER')
|
|
|
|
def visitLeftShift(self, node):
|
|
return self.binaryOp(node, 'BINARY_LSHIFT')
|
|
|
|
def visitRightShift(self, node):
|
|
return self.binaryOp(node, 'BINARY_RSHIFT')
|
|
|
|
# unary ops
|
|
|
|
def unaryOp(self, node, op):
|
|
self.visit(node.expr)
|
|
self.emit(op)
|
|
|
|
def visitInvert(self, node):
|
|
return self.unaryOp(node, 'UNARY_INVERT')
|
|
|
|
def visitUnarySub(self, node):
|
|
return self.unaryOp(node, 'UNARY_NEGATIVE')
|
|
|
|
def visitUnaryAdd(self, node):
|
|
return self.unaryOp(node, 'UNARY_POSITIVE')
|
|
|
|
def visitUnaryInvert(self, node):
|
|
return self.unaryOp(node, 'UNARY_INVERT')
|
|
|
|
def visitNot(self, node):
|
|
return self.unaryOp(node, 'UNARY_NOT')
|
|
|
|
def visitBackquote(self, node):
|
|
return self.unaryOp(node, 'UNARY_CONVERT')
|
|
|
|
# bit ops
|
|
|
|
def bitOp(self, nodes, op):
|
|
self.visit(nodes[0])
|
|
for node in nodes[1:]:
|
|
self.visit(node)
|
|
self.emit(op)
|
|
|
|
def visitBitand(self, node):
|
|
return self.bitOp(node.nodes, 'BINARY_AND')
|
|
|
|
def visitBitor(self, node):
|
|
return self.bitOp(node.nodes, 'BINARY_OR')
|
|
|
|
def visitBitxor(self, node):
|
|
return self.bitOp(node.nodes, 'BINARY_XOR')
|
|
|
|
# object constructors
|
|
|
|
def visitEllipsis(self, node):
|
|
self.emit('LOAD_CONST', Ellipsis)
|
|
|
|
def visitTuple(self, node):
|
|
self.set_lineno(node)
|
|
for elt in node.nodes:
|
|
self.visit(elt)
|
|
self.emit('BUILD_TUPLE', len(node.nodes))
|
|
|
|
def visitList(self, node):
|
|
self.set_lineno(node)
|
|
for elt in node.nodes:
|
|
self.visit(elt)
|
|
self.emit('BUILD_LIST', len(node.nodes))
|
|
|
|
def visitSliceobj(self, node):
|
|
for child in node.nodes:
|
|
self.visit(child)
|
|
self.emit('BUILD_SLICE', len(node.nodes))
|
|
|
|
def visitDict(self, node):
|
|
self.set_lineno(node)
|
|
self.emit('BUILD_MAP', 0)
|
|
for k, v in node.items:
|
|
self.emit('DUP_TOP')
|
|
self.visit(k)
|
|
self.visit(v)
|
|
self.emit('ROT_THREE')
|
|
self.emit('STORE_SUBSCR')
|
|
|
|
class NestedScopeMixin:
|
|
"""Defines initClass() for nested scoping (Python 2.2-compatible)"""
|
|
def initClass(self):
|
|
self.__class__.NameFinder = LocalNameFinder
|
|
self.__class__.FunctionGen = FunctionCodeGenerator
|
|
self.__class__.ClassGen = ClassCodeGenerator
|
|
|
|
class ModuleCodeGenerator(NestedScopeMixin, CodeGenerator):
|
|
__super_init = CodeGenerator.__init__
|
|
|
|
scopes = None
|
|
|
|
def __init__(self, tree):
|
|
self.graph = pyassem.PyFlowGraph("<module>", tree.filename)
|
|
self.futures = future.find_futures(tree)
|
|
self.__super_init()
|
|
walk(tree, self)
|
|
|
|
def get_module(self):
|
|
return self
|
|
|
|
class ExpressionCodeGenerator(NestedScopeMixin, CodeGenerator):
|
|
__super_init = CodeGenerator.__init__
|
|
|
|
scopes = None
|
|
futures = ()
|
|
|
|
def __init__(self, tree):
|
|
self.graph = pyassem.PyFlowGraph("<expression>", tree.filename)
|
|
self.__super_init()
|
|
walk(tree, self)
|
|
|
|
def get_module(self):
|
|
return self
|
|
|
|
class InteractiveCodeGenerator(NestedScopeMixin, CodeGenerator):
|
|
|
|
__super_init = CodeGenerator.__init__
|
|
|
|
scopes = None
|
|
futures = ()
|
|
|
|
def __init__(self, tree):
|
|
self.graph = pyassem.PyFlowGraph("<interactive>", tree.filename)
|
|
self.__super_init()
|
|
self.set_lineno(tree)
|
|
walk(tree, self)
|
|
self.emit('RETURN_VALUE')
|
|
|
|
def get_module(self):
|
|
return self
|
|
|
|
def visitDiscard(self, node):
|
|
# XXX Discard means it's an expression. Perhaps this is a bad
|
|
# name.
|
|
self.visit(node.expr)
|
|
self.emit('PRINT_EXPR')
|
|
|
|
class AbstractFunctionCode:
|
|
optimized = 1
|
|
lambdaCount = 0
|
|
|
|
def __init__(self, func, scopes, isLambda, class_name, mod):
|
|
self.class_name = class_name
|
|
self.module = mod
|
|
if isLambda:
|
|
klass = FunctionCodeGenerator
|
|
name = "<lambda.%d>" % klass.lambdaCount
|
|
klass.lambdaCount = klass.lambdaCount + 1
|
|
else:
|
|
name = func.name
|
|
|
|
args, hasTupleArg = generateArgList(func.argnames)
|
|
self.graph = pyassem.PyFlowGraph(name, func.filename, args,
|
|
optimized=1)
|
|
self.isLambda = isLambda
|
|
self.super_init()
|
|
|
|
if not isLambda and func.doc:
|
|
self.setDocstring(func.doc)
|
|
|
|
lnf = walk(func.code, self.NameFinder(args), verbose=0)
|
|
self.locals.push(lnf.getLocals())
|
|
if func.varargs:
|
|
self.graph.setFlag(CO_VARARGS)
|
|
if func.kwargs:
|
|
self.graph.setFlag(CO_VARKEYWORDS)
|
|
self.set_lineno(func)
|
|
if hasTupleArg:
|
|
self.generateArgUnpack(func.argnames)
|
|
|
|
def get_module(self):
|
|
return self.module
|
|
|
|
def finish(self):
|
|
self.graph.startExitBlock()
|
|
if not self.isLambda:
|
|
self.emit('LOAD_CONST', None)
|
|
self.emit('RETURN_VALUE')
|
|
|
|
def generateArgUnpack(self, args):
|
|
for i in range(len(args)):
|
|
arg = args[i]
|
|
if isinstance(arg, tuple):
|
|
self.emit('LOAD_FAST', '.%d' % (i * 2))
|
|
self.unpackSequence(arg)
|
|
|
|
def unpackSequence(self, tup):
|
|
if VERSION > 1:
|
|
self.emit('UNPACK_SEQUENCE', len(tup))
|
|
else:
|
|
self.emit('UNPACK_TUPLE', len(tup))
|
|
for elt in tup:
|
|
if isinstance(elt, tuple):
|
|
self.unpackSequence(elt)
|
|
else:
|
|
self._nameOp('STORE', elt)
|
|
|
|
unpackTuple = unpackSequence
|
|
|
|
class FunctionCodeGenerator(NestedScopeMixin, AbstractFunctionCode,
|
|
CodeGenerator):
|
|
super_init = CodeGenerator.__init__ # call be other init
|
|
scopes = None
|
|
|
|
__super_init = AbstractFunctionCode.__init__
|
|
|
|
def __init__(self, func, scopes, isLambda, class_name, mod):
|
|
self.scopes = scopes
|
|
self.scope = scopes[func]
|
|
self.__super_init(func, scopes, isLambda, class_name, mod)
|
|
self.graph.setFreeVars(self.scope.get_free_vars())
|
|
self.graph.setCellVars(self.scope.get_cell_vars())
|
|
if self.scope.generator is not None:
|
|
self.graph.setFlag(CO_GENERATOR)
|
|
|
|
class GenExprCodeGenerator(NestedScopeMixin, AbstractFunctionCode,
|
|
CodeGenerator):
|
|
super_init = CodeGenerator.__init__ # call be other init
|
|
scopes = None
|
|
|
|
__super_init = AbstractFunctionCode.__init__
|
|
|
|
def __init__(self, gexp, scopes, class_name, mod):
|
|
self.scopes = scopes
|
|
self.scope = scopes[gexp]
|
|
self.__super_init(gexp, scopes, 1, class_name, mod)
|
|
self.graph.setFreeVars(self.scope.get_free_vars())
|
|
self.graph.setCellVars(self.scope.get_cell_vars())
|
|
self.graph.setFlag(CO_GENERATOR)
|
|
|
|
class AbstractClassCode:
|
|
|
|
def __init__(self, klass, scopes, module):
|
|
self.class_name = klass.name
|
|
self.module = module
|
|
self.graph = pyassem.PyFlowGraph(klass.name, klass.filename,
|
|
optimized=0, klass=1)
|
|
self.super_init()
|
|
lnf = walk(klass.code, self.NameFinder(), verbose=0)
|
|
self.locals.push(lnf.getLocals())
|
|
self.graph.setFlag(CO_NEWLOCALS)
|
|
if klass.doc:
|
|
self.setDocstring(klass.doc)
|
|
|
|
def get_module(self):
|
|
return self.module
|
|
|
|
def finish(self):
|
|
self.graph.startExitBlock()
|
|
self.emit('LOAD_LOCALS')
|
|
self.emit('RETURN_VALUE')
|
|
|
|
class ClassCodeGenerator(NestedScopeMixin, AbstractClassCode, CodeGenerator):
|
|
super_init = CodeGenerator.__init__
|
|
scopes = None
|
|
|
|
__super_init = AbstractClassCode.__init__
|
|
|
|
def __init__(self, klass, scopes, module):
|
|
self.scopes = scopes
|
|
self.scope = scopes[klass]
|
|
self.__super_init(klass, scopes, module)
|
|
self.graph.setFreeVars(self.scope.get_free_vars())
|
|
self.graph.setCellVars(self.scope.get_cell_vars())
|
|
self.set_lineno(klass)
|
|
self.emit("LOAD_GLOBAL", "__name__")
|
|
self.storeName("__module__")
|
|
if klass.doc:
|
|
self.emit("LOAD_CONST", klass.doc)
|
|
self.storeName('__doc__')
|
|
|
|
def generateArgList(arglist):
|
|
"""Generate an arg list marking TupleArgs"""
|
|
args = []
|
|
extra = []
|
|
count = 0
|
|
for i in range(len(arglist)):
|
|
elt = arglist[i]
|
|
if isinstance(elt, str):
|
|
args.append(elt)
|
|
elif isinstance(elt, tuple):
|
|
args.append(TupleArg(i * 2, elt))
|
|
extra.extend(misc.flatten(elt))
|
|
count = count + 1
|
|
else:
|
|
raise ValueError, "unexpect argument type:", elt
|
|
return args + extra, count
|
|
|
|
def findOp(node):
|
|
"""Find the op (DELETE, LOAD, STORE) in an AssTuple tree"""
|
|
v = OpFinder()
|
|
walk(node, v, verbose=0)
|
|
return v.op
|
|
|
|
class OpFinder:
|
|
def __init__(self):
|
|
self.op = None
|
|
def visitAssName(self, node):
|
|
if self.op is None:
|
|
self.op = node.flags
|
|
elif self.op != node.flags:
|
|
raise ValueError, "mixed ops in stmt"
|
|
visitAssAttr = visitAssName
|
|
visitSubscript = visitAssName
|
|
|
|
class Delegator:
|
|
"""Base class to support delegation for augmented assignment nodes
|
|
|
|
To generator code for augmented assignments, we use the following
|
|
wrapper classes. In visitAugAssign, the left-hand expression node
|
|
is visited twice. The first time the visit uses the normal method
|
|
for that node . The second time the visit uses a different method
|
|
that generates the appropriate code to perform the assignment.
|
|
These delegator classes wrap the original AST nodes in order to
|
|
support the variant visit methods.
|
|
"""
|
|
def __init__(self, obj):
|
|
self.obj = obj
|
|
|
|
def __getattr__(self, attr):
|
|
return getattr(self.obj, attr)
|
|
|
|
class AugGetattr(Delegator):
|
|
pass
|
|
|
|
class AugName(Delegator):
|
|
pass
|
|
|
|
class AugSlice(Delegator):
|
|
pass
|
|
|
|
class AugSubscript(Delegator):
|
|
pass
|
|
|
|
wrapper = {
|
|
ast.Getattr: AugGetattr,
|
|
ast.Name: AugName,
|
|
ast.Slice: AugSlice,
|
|
ast.Subscript: AugSubscript,
|
|
}
|
|
|
|
def wrap_aug(node):
|
|
return wrapper[node.__class__](node)
|
|
|
|
if __name__ == "__main__":
|
|
for file in sys.argv[1:]:
|
|
compileFile(file)
|