Source

Pyrex / Pyrex / Compiler / Nodes.py

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#
#   Pyrex - Parse tree nodes
#

import string, sys

import Code
from Errors import error, InternalError
import Naming
import PyrexTypes
from PyrexTypes import py_object_type, c_int_type, error_type, \
	CTypedefType, CFuncType
from Symtab import ModuleScope, LocalScope, \
	StructOrUnionScope, PyClassScope, CClassScope
from Pyrex.Utils import open_new_file, replace_suffix
import Options

from DebugFlags import debug_disposal_code

class Node:
	#  pos         (string, int, int)   Source file position
	#  is_name     boolean              Is a NameNode
	#  is_literal  boolean              Is a ConstNode
	
	is_name = 0
	is_literal = 0
	
	def __init__(self, pos, **kw):
		self.pos = pos
		self.__dict__.update(kw)
	
	gil_message = "Operation"
	
	def gil_check(self, env):
		if env.nogil:
			self.gil_error()
	
	def gil_error(self):
		error(self.pos, "%s not allowed without gil" % self.gil_message)
	
	#
	#  There are 3 phases of parse tree processing, applied in order to
	#  all the statements in a given scope-block:
	#
	#  (1) analyse_declarations
	#        Make symbol table entries for all declarations at the current
	#        level, both explicit (def, cdef, etc.) and implicit (assignment
	#        to an otherwise undeclared name).
	#
	#		(2)	analyse_expressions
	#         Determine the result types of expressions and fill in the
	#         'type' attribute of each ExprNode. Insert coercion nodes into the
	#         tree where needed to convert to and from Python objects. 
	#         Allocate temporary locals for intermediate results.
	#
	#   (3) generate_code
	#         Emit C code for all declarations, statements and expressions.
	#         Recursively applies the 3 processing phases to the bodies of
	#         functions.
	#
	
	def analyse_declarations(self, env):
		pass
	
	def analyse_expressions(self, env):
		raise InternalError("analyse_expressions not implemented for %s" % \
			self.__class__.__name__)
	
	def generate_code(self, code):
		raise InternalError("generate_code not implemented for %s" % \
			self.__class__.__name__)


class BlockNode:
	#  Mixin class for nodes representing a declaration block.
	pass

#	def generate_const_definitions(self, env, code):
#		if env.const_entries:
#			code.putln("")
#			for entry in env.const_entries:
#				if not entry.is_interned:
#					code.put_var_declaration(entry, static = 1)
	
#	def generate_interned_name_decls(self, env, code):
#		#  Flush accumulated interned names from the global scope
#		#  and generate declarations for them.
#		genv = env.global_scope()
#		intern_map = genv.intern_map
#		names = genv.interned_names
#		if names:
#			code.putln("")
#			for name in names:
#				code.putln(
#					"static PyObject *%s;" % intern_map[name])
#			del names[:]
	
#	def generate_py_string_decls(self, env, code):
#		entries = env.pystring_entries
#		if entries:
#			code.putln("")
#			for entry in entries:
#				code.putln(
#					"static PyObject *%s;" % entry.pystring_cname)


class StatListNode(Node):
	# stats     a list of StatNode
	
	def analyse_declarations(self, env):
		#print "StatListNode.analyse_declarations" ###
		for stat in self.stats:
			stat.analyse_declarations(env)
	
	def analyse_expressions(self, env):
		#print "StatListNode.analyse_expressions" ###
		for stat in self.stats:
			stat.analyse_expressions(env)
	
	def generate_function_definitions(self, env, code):
		#print "StatListNode.generate_function_definitions" ###
		for stat in self.stats:
			stat.generate_function_definitions(env, code)
			
	def generate_execution_code(self, code):
		#print "StatListNode.generate_execution_code" ###
		for stat in self.stats:
			code.mark_pos(stat.pos)
			stat.generate_execution_code(code)
	

class StatNode(Node):
	#
	#  Code generation for statements is split into the following subphases:
	#
	#  (1) generate_function_definitions
	#        Emit C code for the definitions of any structs,
	#        unions, enums and functions defined in the current
	#        scope-block.
	#
	#  (2) generate_execution_code
	#        Emit C code for executable statements.
	#
	
	def generate_function_definitions(self, env, code):
		pass
	
	def generate_execution_code(self, code):
		raise InternalError("generate_execution_code not implemented for %s" % \
			self.__class__.__name__)


class CDefExternNode(StatNode):
	#  include_file   string or None
	#  body           StatNode
	
	def analyse_declarations(self, env):
		if self.include_file:
			env.add_include_file(self.include_file)
		old_cinclude_flag = env.in_cinclude
		env.in_cinclude = 1
		self.body.analyse_declarations(env)
		env.in_cinclude = old_cinclude_flag
	
	def analyse_expressions(self, env):
		pass
	
	def generate_execution_code(self, code):
		pass
		

class CDeclaratorNode(Node):
	# Part of a C declaration.
	#
	# Processing during analyse_declarations phase:
	#
	#   analyse
	#      Returns (name, type) pair where name is the
	#      CNameDeclaratorNode of the name being declared 
	#      and type is the type it is being declared as.
	#
	#  calling_convention  string   Calling convention of CFuncDeclaratorNode
	#                               for which this is a base 
	
	calling_convention = ""


class CNameDeclaratorNode(CDeclaratorNode):
	#  name   string           The Pyrex name being declared
	#  cname  string or None   C name, if specified
	
	def analyse(self, base_type, env):
		return self, base_type


class CPtrDeclaratorNode(CDeclaratorNode):
	# base     CDeclaratorNode
	
	def analyse(self, base_type, env):
		if base_type.is_pyobject:
			error(self.pos,
				"Pointer base type cannot be a Python object")
		ptr_type = PyrexTypes.c_ptr_type(base_type)
		return self.base.analyse(ptr_type, env)
		

class CArrayDeclaratorNode(CDeclaratorNode):
	# base        CDeclaratorNode
	# dimension   ExprNode
	
	def analyse(self, base_type, env):
		if self.dimension:
			self.dimension.analyse_const_expression(env)
			if not self.dimension.type.is_int:
				error(self.dimension.pos, "Array dimension not integer")
			size = self.dimension.result()
		else:
			size = None
		if not base_type.is_complete():
			error(self.pos,
				"Array element type '%s' is incomplete" % base_type)
		if base_type.is_pyobject:
			error(self.pos,
				"Array element cannot be a Python object")
		if base_type.is_cfunction:
			error(self.pos,
				"Array element cannot be a function")
		array_type = PyrexTypes.c_array_type(base_type, size)
		return self.base.analyse(array_type, env)


class CFuncDeclaratorNode(CDeclaratorNode):
	# base             CDeclaratorNode
	# args             [CArgDeclNode]
	# has_varargs      boolean
	# exception_value  ConstNode
	# exception_check  boolean    True if PyErr_Occurred check needed
	# nogil            boolean    Can be called without gil
	# with_gil         boolean    Acquire gil around function body

	def analyse(self, return_type, env):
		func_type_args = []
		for arg_node in self.args:
			name_declarator, type = arg_node.analyse(env)
			name = name_declarator.name
			if name_declarator.cname:
				error(self.pos, 
					"Function argument cannot have C name specification")
			# Turn *[] argument into **
			if type.is_array:
				type = PyrexTypes.c_ptr_type(type.base_type)
			# Catch attempted C-style func(void) decl
			if type.is_void:
				error(arg_node.pos, "Function argument cannot be void")
			func_type_args.append(
				PyrexTypes.CFuncTypeArg(name, type, arg_node.pos))
			if arg_node.default:
				error(arg_node.pos, "C function argument cannot have default value")
		exc_val = None
		exc_check = 0
		if return_type.is_pyobject \
			and (self.exception_value or self.exception_check):
				error(self.pos,
					"Exception clause not allowed for function returning Python object")
		else:
			if self.exception_value:
				self.exception_value.analyse_const_expression(env)
				exc_val = self.exception_value.result()
				if not return_type.assignable_from(self.exception_value.type):
					error(self.exception_value.pos,
						"Exception value incompatible with function return type")
			exc_check = self.exception_check
		if return_type.is_array:
			error(self.pos,
				"Function cannot return an array")
		if return_type.is_cfunction:
			error(self.pos,
				"Function cannot return a function")
		func_type = PyrexTypes.CFuncType(
			return_type, func_type_args, self.has_varargs, 
			exception_value = exc_val, exception_check = exc_check,
			calling_convention = self.base.calling_convention,
			nogil = self.nogil, with_gil = self.with_gil)
		return self.base.analyse(func_type, env)


class CArgDeclNode(Node):
	# Item in a function declaration argument list.
	#
	# base_type      CBaseTypeNode
	# declarator     CDeclaratorNode
	# not_none       boolean            Tagged with 'not None'
	# default        ExprNode or None
	# default_entry  Symtab.Entry       Entry for the variable holding the default value
	# is_self_arg    boolean            Is the "self" arg of an extension type method
	# is_kw_only     boolean            Is a keyword-only argument

	is_self_arg = 0
	
	def analyse(self, env):
		#print "CArgDeclNode.analyse: is_self_arg =", self.is_self_arg ###
		base_type = self.base_type.analyse(env)
		return self.declarator.analyse(base_type, env)


class CBaseTypeNode(Node):
	# Abstract base class for C base type nodes.
	#
	# Processing during analyse_declarations phase:
	#
	#   analyse
	#     Returns the type.
	
	pass


class CSimpleBaseTypeNode(CBaseTypeNode):
	# name             string
	# module_path      [string]     Qualifying name components
	# is_basic_c_type  boolean
	# signed           boolean
	# longness         integer
	# is_self_arg      boolean      Is self argument of C method

	def analyse(self, env):
		# Return type descriptor.
		#print "CSimpleBaseTypeNode.analyse: is_self_arg =", self.is_self_arg ###
		type = None
		if self.is_basic_c_type:
			type = PyrexTypes.simple_c_type(self.signed, self.longness, self.name)
			if not type:
				error(self.pos, "Unrecognised type modifier combination")
		elif self.name == "object" and not self.module_path:
			type = py_object_type
		elif self.name is None:
			if self.is_self_arg and env.is_c_class_scope:
				#print "CSimpleBaseTypeNode.analyse: defaulting to parent type" ###
				type = env.parent_type
			else:
				type = py_object_type
		else:
			scope = env.find_imported_module(self.module_path, self.pos)
			if scope:
				entry = scope.find(self.name, self.pos)
				if entry and entry.is_type:
					type = entry.type
				else:
					error(self.pos, "'%s' is not a type identifier" % self.name)
		if type:
			return type
		else:
			return PyrexTypes.error_type


class CComplexBaseTypeNode(CBaseTypeNode):
	# base_type   CBaseTypeNode
	# declarator  CDeclaratorNode
	
	def analyse(self, env):
		base = self.base_type.analyse(env)
		_, type = self.declarator.analyse(base, env)
		return type


class CVarDefNode(StatNode):
	#  C variable definition or forward/extern function declaration.
	#
	#  visibility    'private' or 'public' or 'extern'
	#  base_type     CBaseTypeNode
	#  declarators   [CDeclaratorNode]
	#  in_pxd        boolean
	#  api           boolean
	
	def analyse_declarations(self, env, dest_scope = None):
		if not dest_scope:
			dest_scope = env
		base_type = self.base_type.analyse(env)
		for declarator in self.declarators:
			name_declarator, type = declarator.analyse(base_type, env)
			if not type.is_complete():
				if not (self.visibility == 'extern' and type.is_array):
					error(declarator.pos,
						"Variable type '%s' is incomplete" % type)
			if self.visibility == 'extern' and type.is_pyobject:
				error(declarator.pos,
					"Python object cannot be declared extern")
			name = name_declarator.name
			cname = name_declarator.cname
			if type.is_cfunction:
				entry = dest_scope.declare_cfunction(name, type, declarator.pos,
					cname = cname, visibility = self.visibility, in_pxd = self.in_pxd,
					api = self.api)
			else:
				if self.in_pxd and self.visibility <> 'extern':
					error(self.pos, 
						"Only 'extern' C variable declaration allowed in .pxd file")					
				dest_scope.declare_var(name, type, declarator.pos,
					cname = cname, visibility = self.visibility, is_cdef = 1)
	
	def analyse_expressions(self, env):
		pass
	
	def generate_execution_code(self, code):
		pass


class CStructOrUnionDefNode(StatNode):
	#  name          string
	#  cname         string or None
	#  module_path   [string]
	#  kind          "struct" or "union"
	#  typedef_flag  boolean
	#  visibility    "public" or "private"
	#  in_pxd        boolean
	#  attributes    [CVarDefNode] or None
	#  entry         Entry
	
	def analyse_declarations(self, env):
		scope = None
		if self.attributes is not None:
			scope = StructOrUnionScope()
		if self.module_path:
			home_scope = env.find_imported_module(self.module_path, self.pos)
			if not home_scope:
				return
		else:
			home_scope = env
		self.entry = home_scope.declare_struct_or_union(
			self.name, self.kind, scope, self.typedef_flag, self.pos,
			self.cname, visibility = self.visibility)
		if self.attributes is not None:
			if self.in_pxd and not env.in_cinclude:
				self.entry.defined_in_pxd = 1
			for attr in self.attributes:
				attr.analyse_declarations(env, scope)
	
	def analyse_expressions(self, env):
		pass
	
	def generate_execution_code(self, code):
		pass


class CEnumDefNode(StatNode):
	#  name           string or None
	#  cname          string or None
	#  items          [CEnumDefItemNode]
	#  typedef_flag   boolean
	#  visibility     "public" or "private"
	#  in_pxd         boolean
	#  entry          Entry
	
	def analyse_declarations(self, env):
		self.entry = env.declare_enum(self.name, self.pos,
			cname = self.cname, typedef_flag = self.typedef_flag,
			visibility = self.visibility)
		if self.items is not None:
			if self.in_pxd and not env.in_cinclude:
				self.entry.defined_in_pxd = 1
			for item in self.items:
				item.analyse_declarations(env, self.entry)

	def analyse_expressions(self, env):
		pass
	
	def generate_execution_code(self, code):
		pass


class CEnumDefItemNode(StatNode):
	#  name     string
	#  cname    string or None
	#  value    ExprNode or None
	
	def analyse_declarations(self, env, enum_entry):
		value_node = self.value
		if value_node:
			value_node.analyse_const_expression(env)
			type = value_node.type
			if type.is_int or type.is_enum:
				value = value_node.result()
			else:
				error(self.pos,
					"Type '%s' is not a valid enum value" % type)
				value = "<error>"
		else:
			value = self.name
		entry = env.declare_const(self.name, enum_entry.type, 
			value, self.pos, cname = self.cname)
		enum_entry.enum_values.append(entry)


class CTypeDefNode(StatNode):
	#  base_type    CBaseTypeNode
	#  declarator   CDeclaratorNode
	#  visibility   "public" or "private"
	#  in_pxd       boolean
	
	def analyse_declarations(self, env):
		base = self.base_type.analyse(env)
		name_declarator, type = self.declarator.analyse(base, env)
		name = name_declarator.name
		cname = name_declarator.cname
		entry = env.declare_typedef(name, type, self.pos,
			cname = cname, visibility = self.visibility)
		if self.in_pxd and not env.in_cinclude:
			entry.defined_in_pxd = 1
	
	def analyse_expressions(self, env):
		pass
	
	def generate_execution_code(self, code):
		pass


class FuncDefNode(StatNode, BlockNode):
	#  Base class for function definition nodes.
	#
	#  return_type     PyrexType
	#  #filename        string        C name of filename string const
	#  entry           Symtab.Entry
	
	def analyse_expressions(self, env):
		pass
	
	def need_gil_acquisition(self, lenv):
		return 0
				
	def generate_function_definitions(self, env, code):
		# Generate C code for header and body of function
		genv = env.global_scope()
		lenv = LocalScope(name = self.entry.name, outer_scope = genv)
		lenv.return_type = self.return_type
		type = self.entry.type
		if type.is_cfunction:
			lenv.nogil = type.nogil and not type.with_gil
		code.init_labels()
		self.declare_arguments(lenv)
		self.body.analyse_declarations(lenv)
		self.body.analyse_expressions(lenv)
		# Code for nested function definitions would go here
		# if we supported them, which we probably won't.
		# ----- Top-level constants used by this function
		#self.generate_interned_name_decls(lenv, code)
		#self.generate_py_string_decls(lenv, code)
		#self.generate_const_definitions(lenv, code)
		# ----- Function header
		code.putln("")
		self.generate_function_header(code,
			with_pymethdef = env.is_py_class_scope)
		# ----- Local variable declarations
		self.generate_argument_declarations(lenv, code)
		code.put_var_declarations(lenv.var_entries)
		init = ""
		if not self.return_type.is_void:
			code.putln(
				"%s%s;" % 
					(self.return_type.declaration_code(
						Naming.retval_cname),
					init))
		code.put_var_declarations(lenv.temp_entries)
		self.generate_keyword_list(code)
		# ----- Extern library function declarations
		lenv.generate_library_function_declarations(code)
		# ----- GIL acquisition
		acquire_gil = self.need_gil_acquisition(lenv)
		if acquire_gil:
			code.putln("PyGILState_STATE _save = PyGILState_Ensure();")
		# ----- Fetch arguments
		self.generate_argument_parsing_code(code)
		self.generate_argument_increfs(lenv, code)
		# ----- Initialise local variables
		for entry in lenv.var_entries:
			if entry.type.is_pyobject and entry.init_to_none and entry.used:
				code.put_init_var_to_py_none(entry)
		# ----- Check and convert arguments
		self.generate_argument_conversion_code(code)
		self.generate_argument_type_tests(code)
		# ----- Function body
		self.body.generate_execution_code(code)
		# ----- Default return value
		code.putln("")
		if self.return_type.is_pyobject:
			#if self.return_type.is_extension_type:
			#	lhs = "(PyObject *)%s" % Naming.retval_cname
			#else:
			lhs = Naming.retval_cname
			code.put_init_to_py_none(lhs, self.return_type)
		else:
			val = self.return_type.default_value
			if val:
				code.putln("%s = %s;" % (Naming.retval_cname, val))
		#code.putln("goto %s;" % code.return_label)
		# ----- Error cleanup
		if code.error_label in code.labels_used:
			code.put_goto(code.return_label)
			code.put_label(code.error_label)
			code.put_var_xdecrefs(lenv.temp_entries)
			default_retval = self.return_type.default_value
			err_val = self.error_value()
			exc_check = self.caller_will_check_exceptions()
			if err_val or exc_check:
				code.putln(
					'__Pyx_AddTraceback("%s");' % 
						self.entry.qualified_name)
				val = err_val or default_retval
				if val:
					code.putln(
						"%s = %s;" % (
							Naming.retval_cname, 
							val))
			else:
				code.use_utility_code(unraisable_exception_utility_code)
				code.putln(
					'__Pyx_WriteUnraisable("%s");' % 
						self.entry.qualified_name)
				#if not self.return_type.is_void:
				if default_retval:
					code.putln(
						"%s = %s;" % (
							Naming.retval_cname,
							default_retval))
							#self.return_type.default_value))
		# ----- Return cleanup
		code.put_label(code.return_label)
		code.put_var_decrefs(lenv.var_entries, used_only = 1)
		#code.put_var_decrefs(lenv.arg_entries)
		self.generate_argument_decrefs(lenv, code)
		self.put_stararg_decrefs(code)
		if acquire_gil:
			code.putln("PyGILState_Release(_save);")
		if not self.return_type.is_void:
			code.putln("return %s;" % Naming.retval_cname)
		code.putln("}")
	
	def put_stararg_decrefs(self, code):
		pass

	def declare_argument(self, env, arg, readonly = 0):
		if arg.type.is_void:
			error(arg.pos, "Invalid use of 'void'")
		elif not arg.type.is_complete() and not arg.type.is_array:
			error(arg.pos,
				"Argument type '%s' is incomplete" % arg.type)
		return env.declare_arg(arg.name, arg.type, arg.pos,
			readonly = readonly)
	
	def generate_argument_increfs(self, env, code):
		# Turn writable borrowed argument refs into owned refs.
		# This is necessary, because if the argument is assigned to,
		# it will be decrefed.
		for entry in env.arg_entries:
			if not entry.is_readonly:
				code.put_var_incref(entry)
	
	def generate_argument_decrefs(self, env, code):
		for entry in env.arg_entries:
			if not entry.is_readonly:
				code.put_var_decref(entry)

	def generate_execution_code(self, code):
		pass


class CFuncDefNode(FuncDefNode):
	#  C function definition.
	#
	#  visibility    'private' or 'public' or 'extern'
	#  base_type     CBaseTypeNode
	#  declarator    CDeclaratorNode
	#  body          StatListNode
	#  api           boolean
	#
	#  with_gil      boolean    Acquire GIL around body
	#  type          CFuncType
	
	def unqualified_name(self):
		return self.entry.name
		
	def analyse_declarations(self, env):
		base_type = self.base_type.analyse(env)
		name_declarator, type = self.declarator.analyse(base_type, env)
		if not type.is_cfunction:
			error(self.pos, 
				"Suite attached to non-function declaration")
		# Remember the actual type according to the function header
		# written here, because the type in the symbol table entry
		# may be different if we're overriding a C method inherited
		# from the base type of an extension type.
		self.type = type
		name = name_declarator.name
		cname = name_declarator.cname
		self.entry = env.declare_cfunction(
			name, type, self.pos, 
			cname = cname, visibility = self.visibility,
			defining = self.body is not None,
			api = self.api)
		self.return_type = type.return_type
	
	def declare_arguments(self, env):
		type = self.type
		without_gil = type.nogil and not type.with_gil
		for arg in type.args:
			if not arg.name:
				error(arg.pos, "Missing argument name")
			self.declare_argument(env, arg,
				readonly = without_gil and arg.type.is_pyobject)
			
	def need_gil_acquisition(self, lenv):
		type = self.type
		with_gil = type.with_gil
		if type.nogil and not with_gil:
#			for arg in type.args:
#				if arg.type.is_pyobject:
#					error(self.pos,
#						"Function with Python argument cannot be declared nogil")
			if type.return_type.is_pyobject:
				error(self.pos,
					"Function with Python return type cannot be declared nogil")
			for entry in lenv.var_entries + lenv.temp_entries:
				#print "CFuncDefNode.need_gil_acquisition:", entry.name, entry.cname, "readonly =", entry.is_readonly ###
				if entry.type.is_pyobject and not entry.is_readonly:
					error(self.pos, "Function declared nogil has Python locals or temporaries")
		return with_gil

	def generate_function_header(self, code, with_pymethdef):
		arg_decls = []
		type = self.type
		visibility = self.entry.visibility
		for arg in type.args:
			arg_decls.append(arg.declaration_code())
		if type.has_varargs:
			arg_decls.append("...")
		if not arg_decls:
			arg_decls = ["void"]
		entity = type.function_header_code(self.entry.func_cname,
			string.join(arg_decls, ","))
		if visibility == 'public':
			dll_linkage = "DL_EXPORT"
		else:
			dll_linkage = None
		header = self.return_type.declaration_code(entity,
			dll_linkage = dll_linkage)
		if visibility <> 'private':
			storage_class = "%s " % Naming.extern_c_macro
		else:
			storage_class = "static "
		code.putln("%s%s {" % (
			storage_class,
			header))

	def generate_argument_declarations(self, env, code):
		# Arguments already declared in function header
		pass
	
	def generate_keyword_list(self, code):
		pass
		
	def generate_argument_parsing_code(self, code):
		pass
	
	def generate_argument_conversion_code(self, code):
		pass
	
	def generate_argument_type_tests(self, code):
		pass
	
	def error_value(self):
		if self.return_type.is_pyobject:
			return "0"
		else:
			#return None
			return self.entry.type.exception_value
			
	def caller_will_check_exceptions(self):
		return self.entry.type.exception_check


class PyArgDeclNode(Node):
	# Argument which must be a Python object (used
	# for * and ** arguments).
	#
	# name   string
	# entry  Symtab.Entry
	
	pass
	

class DefNode(FuncDefNode):
	# A Python function definition.
	#
	# name          string                 the Python name of the function
	# args          [CArgDeclNode]         formal arguments
	# star_arg      PyArgDeclNode or None  * argument
	# starstar_arg  PyArgDeclNode or None  ** argument
	# doc           string or None
	# body          StatListNode
	#
	#  The following subnode is constructed internally
	#  when the def statement is inside a Python class definition.
	#
	#  assmt   AssignmentNode   Function construction/assignment
	
	assmt = None
	num_kwonly_args = 0
	reqd_kw_flags_cname = "0"
	has_star_or_kwonly_args = 0
	
	def __init__(self, pos, **kwds):
		FuncDefNode.__init__(self, pos, **kwds)
		n = 0
		for arg in self.args:
			if arg.kw_only:
				n += 1
		self.num_kwonly_args = n
		if self.star_arg or self.starstar_arg or n > 0:
			self.has_star_or_kwonly_args = 1
	
	def analyse_declarations(self, env):
		for arg in self.args:
			base_type = arg.base_type.analyse(env)
			name_declarator, type = \
				arg.declarator.analyse(base_type, env)
			arg.name = name_declarator.name
			if name_declarator.cname:
				error(self.pos,
					"Python function argument cannot have C name specification")
			arg.type = type.as_argument_type()
			arg.hdr_type = None
			arg.needs_conversion = 0
			arg.needs_type_test = 0
			arg.is_generic = 1
			if arg.not_none and not arg.type.is_extension_type:
				error(self.pos,
					"Only extension type arguments can have 'not None'")
		self.declare_pyfunction(env)
		self.analyse_signature(env)
		self.return_type = self.entry.signature.return_type()
#		if self.has_star_or_kwonly_args:
#			env.use_utility_code(get_starargs_utility_code)
	
	def analyse_signature(self, env):
		any_type_tests_needed = 0
		sig = self.entry.signature
		nfixed = sig.num_fixed_args()
		for i in range(nfixed):
			if i < len(self.args):
				arg = self.args[i]
				arg.is_generic = 0
				if sig.is_self_arg(i):
					arg.is_self_arg = 1
					arg.hdr_type = arg.type = env.parent_type
					arg.needs_conversion = 0
				else:
					arg.hdr_type = sig.fixed_arg_type(i)
					if not arg.type.same_as(arg.hdr_type):
						if arg.hdr_type.is_pyobject and arg.type.is_pyobject:
							arg.needs_type_test = 1
							any_type_tests_needed = 1
						else:
							arg.needs_conversion = 1
				if arg.needs_conversion:
					arg.hdr_cname = Naming.arg_prefix + arg.name
				else:
					arg.hdr_cname = Naming.var_prefix + arg.name
			else:
				self.bad_signature()
				return
		if nfixed < len(self.args):
			if not sig.has_generic_args:
				self.bad_signature()
			for arg in self.args:
				if arg.is_generic and arg.type.is_extension_type:
					arg.needs_type_test = 1
					any_type_tests_needed = 1
#		if any_type_tests_needed:
#			env.use_utility_code(arg_type_test_utility_code)
	
	def bad_signature(self):
		sig = self.entry.signature
		expected_str = "%d" % sig.num_fixed_args()
		if sig.has_generic_args:
			expected_str = expected_str + " or more"
		name = self.name
		if name.startswith("__") and name.endswith("__"):
			desc = "Special method"
		else:
			desc = "Method"
		error(self.pos,
			"%s %s has wrong number of arguments "
			"(%d declared, %s expected)" % (
				desc, self.name, len(self.args), expected_str))
	
	def declare_pyfunction(self, env):
		#print "DefNode.declare_pyfunction:", self.name, "in", env ###
		name = self.name
		entry = env.declare_pyfunction(self.name, self.pos)
		self.entry = entry
		prefix = env.scope_prefix
		entry.func_cname = \
			Naming.func_prefix + prefix + name
		entry.pymethdef_cname = \
			Naming.pymethdef_prefix + prefix + name
		if not entry.is_special:
			entry.doc = self.doc
			entry.doc_cname = \
				Naming.funcdoc_prefix + prefix + name
		
	def declare_arguments(self, env):
		for arg in self.args:
			if not arg.name:
				error(arg.pos, "Missing argument name")
			if arg.needs_conversion:
				arg.entry = env.declare_var(arg.name, arg.type, arg.pos)
				if arg.type.is_pyobject:
					arg.entry.init = "0"
				arg.entry.init_to_none = 0
			else:
				arg.entry = self.declare_argument(env, arg)
			arg.entry.used = 1
			arg.entry.is_self_arg = arg.is_self_arg
			if arg.hdr_type:
				if arg.is_self_arg or \
					(arg.type.is_extension_type and not arg.hdr_type.is_extension_type):
						arg.entry.is_declared_generic = 1
		self.declare_python_arg(env, self.star_arg)
		self.declare_python_arg(env, self.starstar_arg)

	def declare_python_arg(self, env, arg):
		if arg:
			entry = env.declare_var(arg.name, 
				PyrexTypes.py_object_type, arg.pos)
			entry.used = 1
			entry.init = "0"
			entry.init_to_none = 0
			entry.xdecref_cleanup = 1
			arg.entry = entry
			
	def analyse_expressions(self, env):
		self.analyse_default_values(env)
		if env.is_py_class_scope:
			self.synthesize_assignment_node(env)
	
	def analyse_default_values(self, env):
		for arg in self.args:
			if arg.default:
				if arg.is_generic:
					arg.default.analyse_types(env)
					arg.default = arg.default.coerce_to(arg.type, env)
					arg.default.allocate_temps(env)
					arg.default_entry = env.add_default_value(arg.type)
					arg.default_entry.used = 1
				else:
					error(arg.pos,
						"This argument cannot have a default value")
					arg.default = None
	
	def synthesize_assignment_node(self, env):
		import ExprNodes
		self.assmt = SingleAssignmentNode(self.pos,
			lhs = ExprNodes.NameNode(self.pos, name = self.name),
			rhs = ExprNodes.UnboundMethodNode(self.pos, 
				class_cname = env.class_obj_cname,
				function = ExprNodes.PyCFunctionNode(self.pos,
					pymethdef_cname = self.entry.pymethdef_cname)))
		self.assmt.analyse_declarations(env)
		self.assmt.analyse_expressions(env)
			
	def generate_function_header(self, code, with_pymethdef):
		arg_code_list = []
		sig = self.entry.signature
		if sig.has_dummy_arg:
			arg_code_list.append(
				"PyObject *%s" % Naming.self_cname)
		for arg in self.args:
			if not arg.is_generic:
				if arg.is_self_arg:
					arg_code_list.append("PyObject *%s" % arg.hdr_cname)
				else:
					arg_code_list.append(
						arg.hdr_type.declaration_code(arg.hdr_cname))
		if sig.has_generic_args:
			arg_code_list.append(
				"PyObject *%s, PyObject *%s"
					% (Naming.args_cname, Naming.kwds_cname))
		arg_code = ", ".join(arg_code_list)
		dc = self.return_type.declaration_code(self.entry.func_cname)
		header = "static %s(%s)" % (dc, arg_code)
		code.putln("%s; /*proto*/" % header)
		if self.entry.doc:
			code.putln(
				'static char %s[] = "%s";' % (
					self.entry.doc_cname,
					self.entry.doc))
		if with_pymethdef:
			code.put(
				"static PyMethodDef %s = " % 
					self.entry.pymethdef_cname)
			code.put_pymethoddef(self.entry, ";")
		code.putln("%s {" % header)

	def generate_argument_declarations(self, env, code):
		for arg in self.args:
			if arg.is_generic: # or arg.needs_conversion:
				code.put_var_declaration(arg.entry)
	
	def generate_keyword_list(self, code):
		if self.entry.signature.has_generic_args:
			reqd_kw_flags = []
			has_reqd_kwds = False
			code.put(
				"static char *%s[] = {" %
					Naming.kwdlist_cname)
			for arg in self.args:
				if arg.is_generic:
					code.put(
						'"%s",' % 
							arg.name)
					if arg.kw_only and not arg.default:
						has_reqd_kwds = 1
						flag = "1"
					else:
						flag = "0"
					reqd_kw_flags.append(flag)
			code.putln(
				"0};")
			if has_reqd_kwds:
				flags_name = Naming.reqd_kwds_cname
				self.reqd_kw_flags_cname = flags_name
				code.putln(
					"static char %s[] = {%s};" % (
						flags_name,
						",".join(reqd_kw_flags)))
	
	def generate_argument_parsing_code(self, code):
		# Generate PyArg_ParseTuple call for generic
		# arguments, if any.
		has_kwonly_args = self.num_kwonly_args > 0
		has_star_or_kw_args = self.star_arg is not None \
			or self.starstar_arg is not None or has_kwonly_args
		if not self.entry.signature.has_generic_args:
			if has_star_or_kw_args:
				error(self.pos, "This method cannot have * or keyword arguments")
		else:
			arg_addrs = []
			arg_formats = []
			default_seen = 0
			for arg in self.args:
				arg_entry = arg.entry
				if arg.is_generic:
					if arg.default:
						code.putln(
							"%s = %s;" % (
								arg_entry.cname,
								arg.default_entry.cname))
						if not default_seen:
							arg_formats.append("|")
						default_seen = 1
					elif default_seen and not arg.kw_only:
						error(arg.pos, "Non-default argument following default argument")
					arg_addrs.append("&" + arg_entry.cname)
					format = arg_entry.type.parsetuple_format
					if format:
						arg_formats.append(format)
					else:
						error(arg.pos, 
							"Cannot convert Python object argument to type '%s'" 
								% arg.type)
			error_return_code = "return %s;" % self.error_value()
			argformat = '"%s"' % string.join(arg_formats, "")
			if has_star_or_kw_args:
				self.generate_stararg_getting_code(code)
			pt_arglist = [Naming.args_cname, Naming.kwds_cname, argformat,
					Naming.kwdlist_cname] + arg_addrs
			pt_argstring = string.join(pt_arglist, ", ")
			code.put(
				'if (!PyArg_ParseTupleAndKeywords(%s)) ' %
					pt_argstring)
			if has_star_or_kw_args:
				code.putln("{")
				code.put_xdecref(Naming.args_cname, py_object_type)
				code.put_xdecref(Naming.kwds_cname, py_object_type)
				self.generate_arg_xdecref(self.star_arg, code)
				self.generate_arg_xdecref(self.starstar_arg, code)
				code.putln(error_return_code)
				code.putln("}")
			else:
				code.putln(error_return_code)
		
	def put_stararg_decrefs(self, code):
		if self.has_star_or_kwonly_args:
			code.put_xdecref(Naming.args_cname, py_object_type)
			code.put_xdecref(Naming.kwds_cname, py_object_type)
	
	def generate_arg_xdecref(self, arg, code):
		if arg:
			code.put_var_xdecref(arg.entry)
	
	def arg_address(self, arg):
		if arg:
			return "&%s" % arg.entry.cname
		else:
			return 0

	def generate_stararg_getting_code(self, code):
		num_kwonly = self.num_kwonly_args
		nargs = len(self.args) - num_kwonly - self.entry.signature.num_fixed_args()
		star_arg_addr = self.arg_address(self.star_arg)
		starstar_arg_addr = self.arg_address(self.starstar_arg)
		code.use_utility_code(get_starargs_utility_code)
		code.putln(
			"if (__Pyx_GetStarArgs(&%s, &%s, %s, %s, %s, %s, %s) < 0) return %s;" % (
				Naming.args_cname,
				Naming.kwds_cname,
				Naming.kwdlist_cname,
				nargs,
				star_arg_addr,
				starstar_arg_addr,
				self.reqd_kw_flags_cname,
				self.error_value()))
	
	def generate_argument_conversion_code(self, code):
		# Generate code to convert arguments from
		# signature type to declared type, if needed.
		for arg in self.args:
			if arg.needs_conversion:
				self.generate_arg_conversion(arg, code)

	def generate_arg_conversion(self, arg, code):
		# Generate conversion code for one argument.
		old_type = arg.hdr_type
		new_type = arg.type
		if old_type.is_pyobject:
			self.generate_arg_conversion_from_pyobject(arg, code)
		elif new_type.is_pyobject:
			self.generate_arg_conversion_to_pyobject(arg, code)
		else:
			if new_type.assignable_from(old_type):
				code.putln(
					"%s = %s;" % (arg.entry.cname, arg.hdr_cname))
			else:
				error(arg.pos,
					"Cannot convert argument from '%s' to '%s'" %
						(old_type, new_type))
	
	def generate_arg_conversion_from_pyobject(self, arg, code):
		new_type = arg.type
		func = new_type.from_py_function
		if func:
			code.putln("%s = %s(%s); if (PyErr_Occurred()) %s" % (
				arg.entry.cname,
				func,
				arg.hdr_cname,
				code.error_goto(arg.pos)))
		else:
			error(arg.pos, 
				"Cannot convert Python object argument to type '%s'" 
					% new_type)
	
	def generate_arg_conversion_to_pyobject(self, arg, code):
		old_type = arg.hdr_type
		func = old_type.to_py_function
		if func:
			code.putln("%s = %s(%s); if (!%s) %s" % (
				arg.entry.cname,
				func,
				arg.hdr_cname,
				arg.entry.cname,
				code.error_goto(arg.pos)))
		else:
			error(arg.pos,
				"Cannot convert argument of type '%s' to Python object"
					% old_type)

	def generate_argument_type_tests(self, code):
		# Generate type tests for args whose signature
		# type is PyObject * and whose declared type is
		# a subtype thereof.
		for arg in self.args:
			if arg.needs_type_test:
				self.generate_arg_type_test(arg, code)
	
	def generate_arg_type_test(self, arg, code):
		# Generate type test for one argument.
		if arg.type.typeobj_is_available():
			typeptr_cname = arg.type.typeptr_cname
			arg_code = "((PyObject *)%s)" % arg.entry.cname
			code.use_utility_code(arg_type_test_utility_code)
			code.putln(
				'if (!__Pyx_ArgTypeTest(%s, %s, %d, "%s")) %s' % (
					arg_code, 
					typeptr_cname,
					not arg.not_none,
					arg.name,
					code.error_goto(arg.pos)))
		else:
			error(arg.pos, "Cannot test type of extern C class "
				"without type object name specification")
	
	def generate_execution_code(self, code):
		# Evaluate and store argument default values
		for arg in self.args:
			default = arg.default
			if default:
				default.generate_evaluation_code(code)
				default.make_owned_reference(code)
				code.putln(
					"%s = %s;" % (
						arg.default_entry.cname,
						default.result_as(arg.default_entry.type)))
				default.generate_post_assignment_code(code)
#				if default.is_temp and default.type.is_pyobject:
#					code.putln(
#						"%s = 0;" %
#							default.result())
		# For Python class methods, create and store function object
		if self.assmt:
			self.assmt.generate_execution_code(code)
	
	def error_value(self):
		return self.entry.signature.error_value
	
	def caller_will_check_exceptions(self):
		return 1
			

class PyClassDefNode(StatNode, BlockNode):
	#  A Python class definition.
	#
	#  name     string          Name of the class
	#  doc      string or None
	#  body     StatNode        Attribute definition code
	#  entry    Symtab.Entry
	#  scope    PyClassScope
	#
	#  The following subnodes are constructed internally:
	#
	#  dict     DictNode   Class dictionary
	#  classobj ClassNode  Class object
	#  target   NameNode   Variable to assign class object to
	
	def __init__(self, pos, name, bases, doc, body):
		StatNode.__init__(self, pos)
		self.name = name
		self.doc = doc
		self.body = body
		import ExprNodes
		self.dict = ExprNodes.DictNode(pos, key_value_pairs = [])
		if self.doc:
			doc_node = ExprNodes.StringNode(pos, value = self.doc)
		else:
			doc_node = None
		self.classobj = ExprNodes.ClassNode(pos,
			name = ExprNodes.StringNode(pos, value = name), 
			bases = bases, dict = self.dict, doc = doc_node)
		self.target = ExprNodes.NameNode(pos, name = name)
	
	def analyse_declarations(self, env):
		self.target.analyse_target_declaration(env)
	
	def analyse_expressions(self, env):
		self.dict.analyse_expressions(env)
		self.classobj.analyse_expressions(env)
		genv = env.global_scope()
		cenv = PyClassScope(name = self.name, outer_scope = genv)
		cenv.class_dict_cname = self.dict.result()
		cenv.class_obj_cname = self.classobj.result()
		self.scope = cenv
		self.body.analyse_declarations(cenv)
		self.body.analyse_expressions(cenv)
		self.target.analyse_target_expression(env, self.classobj)
		self.dict.release_temp(env)
		#self.classobj.release_temp(env)
		#self.target.release_target_temp(env)
	
	def generate_function_definitions(self, env, code):
		#self.generate_py_string_decls(self.scope, code)
		self.body.generate_function_definitions(
			self.scope, code)
	
	def generate_execution_code(self, code):
		self.dict.generate_evaluation_code(code)
		self.classobj.generate_evaluation_code(code)
		self.body.generate_execution_code(code)
		self.target.generate_assignment_code(self.classobj, code)
		self.dict.generate_disposal_code(code)


class CClassDefNode(StatNode):
	#  An extension type definition.
	#
	#  visibility         'private' or 'public' or 'extern'
	#  typedef_flag       boolean
	#  api                boolean
	#  module_name        string or None    For import of extern type objects
	#  class_name         string            Unqualified name of class
	#  as_name            string or None    Name to declare as in this scope
	#  base_class_module  string or None    Module containing the base class
	#  base_class_name    string or None    Name of the base class
	#  objstruct_name     string or None    Specified C name of object struct
	#  typeobj_name       string or None    Specified C name of type object
	#  in_pxd             boolean           Is in a .pxd file
	#  doc                string or None
	#  body               StatNode or None
	#  entry              Symtab.Entry
	#  base_type          PyExtensionType or None
	
	entry = None
	
	def analyse_declarations(self, env):
		#print "CClassDefNode.analyse_declarations:", self.class_name
		#print "...visibility =", self.visibility
		#print "...module_name =", self.module_name
		if env.in_cinclude and not self.objstruct_name:
			error(self.pos, "Object struct name specification required for "
				"C class defined in 'extern from' block")
		self.base_type = None
		if self.base_class_name:
			if self.base_class_module:
				base_class_scope = env.find_module(self.base_class_module, self.pos)
			else:
				base_class_scope = env
			if base_class_scope:
				base_class_entry = base_class_scope.find(self.base_class_name, self.pos)
				if base_class_entry:
					if not base_class_entry.is_type:
						error(self.pos, "'%s' is not a type name" % self.base_class_name)
					elif not base_class_entry.type.is_extension_type:
						error(self.pos, "'%s' is not an extension type" % self.base_class_name)
					elif not base_class_entry.type.is_complete():
						error(self.pos, "Base class '%s' is incomplete" % self.base_class_name)
					else:
						self.base_type = base_class_entry.type
		has_body = self.body is not None
		if self.module_name and self.visibility <> 'extern':
			module_path = self.module_name.split(".")
			home_scope = env.find_imported_module(module_path, self.pos)
			if not home_scope:
				return
		else:
			home_scope = env
		self.entry = home_scope.declare_c_class(
			name = self.class_name, 
			pos = self.pos,
			defining = has_body and self.in_pxd,
			implementing = has_body and not self.in_pxd,
			module_name = self.module_name,
			base_type = self.base_type,
			objstruct_cname = self.objstruct_name,
			typeobj_cname = self.typeobj_name,
			visibility = self.visibility,
			typedef_flag = self.typedef_flag,
			api = self.api)
		if home_scope is not env and self.visibility == 'extern':
			env.add_imported_entry(self.class_name, self.entry, pos)
		scope = self.entry.type.scope
		if self.doc:
			scope.doc = self.doc
		if has_body:
			self.body.analyse_declarations(scope)
			if self.in_pxd:
				scope.defined = 1
			else:
				scope.implemented = 1
		env.allocate_vtable_names(self.entry)
		
	def analyse_expressions(self, env):
		if self.body:
			self.body.analyse_expressions(env)
	
	def generate_function_definitions(self, env, code):
		if self.entry and self.body:
#			self.body.generate_function_definitions(
#				self.entry.type.scope, code)
			self.body.generate_function_definitions(env, code)
	
	def generate_execution_code(self, code):
		# This is needed to generate evaluation code for
		# default values of method arguments.
		if self.body:
			self.body.generate_execution_code(code)


class PropertyNode(StatNode):
	#  Definition of a property in an extension type.
	#
	#  name   string
	#  doc    string or None    Doc string
	#  body   StatListNode
	
	def analyse_declarations(self, env):
		#print "PropertyNode.analyse_declarations:", env ###
		entry = env.declare_property(self.name, self.doc, self.pos)
		if entry:
			#if self.doc:
			#	doc_entry = env.get_string_const(self.doc)
			#	entry.doc_cname = doc_entry.cname
			self.body.analyse_declarations(entry.scope)
		
	def analyse_expressions(self, env):
		self.body.analyse_expressions(env)
	
	def generate_function_definitions(self, env, code):
		self.body.generate_function_definitions(env, code)

	def generate_execution_code(self, code):
		pass


class GlobalNode(StatNode):
	# Global variable declaration.
	#
	# names    [string]
	
	def analyse_declarations(self, env):
		for name in self.names:
			env.declare_global(name, self.pos)

	def analyse_expressions(self, env):
		pass
	
	def generate_execution_code(self, code):
		pass


class ExprStatNode(StatNode):
	#  Expression used as a statement.
	#
	#  expr   ExprNode
	
	def analyse_expressions(self, env):
		self.expr.analyse_expressions(env)
		self.expr.release_temp(env)
	
	def generate_execution_code(self, code):
		self.expr.generate_evaluation_code(code)
		if not self.expr.is_temp and self.expr.result():
			code.putln("%s;" % self.expr.result())
		self.expr.generate_disposal_code(code)


class AssignmentNode(StatNode):
	#  Abstract base class for assignment nodes.
	#
	#  The analyse_expressions and generate_execution_code
	#  phases of assignments are split into two sub-phases
	#  each, to enable all the right hand sides of a
	#  parallel assignment to be evaluated before assigning
	#  to any of the left hand sides.

	def analyse_expressions(self, env):
		self.analyse_types(env)
		self.allocate_rhs_temps(env)
		self.allocate_lhs_temps(env)

	def generate_execution_code(self, code):
		self.generate_rhs_evaluation_code(code)
		self.generate_assignment_code(code)


class SingleAssignmentNode(AssignmentNode):
	#  The simplest case:
	#
	#    a = b
	#
	#  lhs      ExprNode      Left hand side
	#  rhs      ExprNode      Right hand side

	def analyse_declarations(self, env):
		self.lhs.analyse_target_declaration(env)
	
	def analyse_types(self, env, use_temp = 0):
		self.rhs.analyse_types(env)
		self.lhs.analyse_target_types(env)
		self.lhs.gil_assignment_check(env)
		self.rhs = self.rhs.coerce_to(self.lhs.type, env)
		if use_temp:
			self.rhs = self.rhs.coerce_to_temp(env)
	
	def allocate_rhs_temps(self, env):
		self.rhs.allocate_temps(env)

	def allocate_lhs_temps(self, env):
		self.lhs.allocate_target_temps(env, self.rhs)

	def generate_rhs_evaluation_code(self, code):
		self.rhs.generate_evaluation_code(code)
	
	def generate_assignment_code(self, code):
		self.lhs.generate_assignment_code(self.rhs, code)


class AugmentedAssignmentNode(SingleAssignmentNode):
	#  An in-place operation:
	#
	#    a op= b
	#
	#  lhs       ExprNode      Left hand side
	#  operator  string
	#  rhs       ExprNode      Right hand side

	def analyse_types(self, env):
		op = self.operator
		self.rhs.analyse_types(env)
		self.lhs.analyse_inplace_types(env)
		type = self.lhs.type
		if type.is_pyobject:
			type = py_object_type
		else:
			if type.is_ptr and (op == '+=' or op == '-='):
				type = c_int_type
			elif op == "**=":
				error(self.pos, "**= operator not supported for non-Python types")
				return
		self.rhs = self.rhs.coerce_to(type, env)

	def allocate_lhs_temps(self, env):
		self.lhs.allocate_inplace_target_temps(env, self.rhs)

	def generate_assignment_code(self, code):
		self.lhs.generate_inplace_assignment_code(self.operator, self.rhs, code)


class CascadedAssignmentNode(AssignmentNode):
	#  An assignment with multiple left hand sides:
	#
	#    a = b = c
	#
	#  lhs_list   [ExprNode]   Left hand sides
	#  rhs        ExprNode     Right hand sides
	#
	#  Used internally:
	#
	#  coerced_rhs_list   [ExprNode]   RHS coerced to type of each LHS
	
	def analyse_declarations(self, env):
		for lhs in self.lhs_list:
			lhs.analyse_target_declaration(env)
	
	def analyse_types(self, env, use_temp = 0):
		self.rhs.analyse_types(env)
		if use_temp:
			self.rhs = self.rhs.coerce_to_temp(env)
		else:
			self.rhs = self.rhs.coerce_to_simple(env)
		from ExprNodes import CloneNode
		self.coerced_rhs_list = []
		for lhs in self.lhs_list:
			lhs.analyse_target_types(env)
			lhs.gil_assignment_check(env)
			rhs = CloneNode(self.rhs)
			rhs = rhs.coerce_to(lhs.type, env)
			self.coerced_rhs_list.append(rhs)

	def allocate_rhs_temps(self, env):
		self.rhs.allocate_temps(env)
	
	def allocate_lhs_temps(self, env):
		for lhs, rhs in zip(self.lhs_list, self.coerced_rhs_list):
			rhs.allocate_temps(env)
			lhs.allocate_target_temps(env, rhs)
			#lhs.release_target_temp(env)
			#rhs.release_temp(env)
		self.rhs.release_temp(env)
	
	def generate_rhs_evaluation_code(self, code):
		self.rhs.generate_evaluation_code(code)
	
	def generate_assignment_code(self, code):
		for i in range(len(self.lhs_list)):
			lhs = self.lhs_list[i]
			rhs = self.coerced_rhs_list[i]
			rhs.generate_evaluation_code(code)
			lhs.generate_assignment_code(rhs, code)
			# Assignment has disposed of the cloned RHS
		self.rhs.generate_disposal_code(code)

class ParallelAssignmentNode(AssignmentNode):
	#  A combined packing/unpacking assignment:
	#
	#    a, b, c =  d, e, f
	#
	#  This has been rearranged by the parser into
	#
	#    a = d ; b = e ; c = f
	#
	#  but we must evaluate all the right hand sides
	#  before assigning to any of the left hand sides.
	#
	#  stats     [AssignmentNode]   The constituent assignments
	
	def analyse_declarations(self, env):
		for stat in self.stats:
			stat.analyse_declarations(env)
	
	def analyse_expressions(self, env):
		for stat in self.stats:
			stat.analyse_types(env, use_temp = 1)
			stat.allocate_rhs_temps(env)
		for stat in self.stats:
			stat.allocate_lhs_temps(env)
	
	def generate_execution_code(self, code):
		for stat in self.stats:
			stat.generate_rhs_evaluation_code(code)
		for stat in self.stats:
			stat.generate_assignment_code(code)


class PrintStatNode(StatNode):
	#  print statement
	#
	#  args              [ExprNode]
	#  ends_with_comma   boolean
	
	def analyse_expressions(self, env):
		for i in range(len(self.args)):
			arg = self.args[i]
			arg.analyse_types(env)
			arg = arg.coerce_to_pyobject(env)
			arg.allocate_temps(env)
			arg.release_temp(env)
			self.args[i] = arg
#		env.use_utility_code(printing_utility_code)
		self.gil_check(env)

	gil_message = "Python print statement"
	
	def generate_execution_code(self, code):
		for arg in self.args:
			arg.generate_evaluation_code(code)
			code.use_utility_code(printing_utility_code)
			code.putln(
				"if (__Pyx_PrintItem(%s) < 0) %s" % (
					arg.py_result(),
					code.error_goto(self.pos)))
			arg.generate_disposal_code(code)
		if not self.ends_with_comma:
			code.use_utility_code(printing_utility_code)
			code.putln(
				"if (__Pyx_PrintNewline() < 0) %s" %
					code.error_goto(self.pos))


class DelStatNode(StatNode):
	#  del statement
	#
	#  args     [ExprNode]
	
	def analyse_declarations(self, env):
		for arg in self.args:
			arg.analyse_target_declaration(env)
	
	def analyse_expressions(self, env):
		for arg in self.args:
			arg.analyse_target_expression(env, None)
			if not arg.type.is_pyobject:
				error(arg.pos, "Deletion of non-Python object")
			else:
				self.gil_check(env)
	
	gil_message = "Deleting Python object"
	
	def generate_execution_code(self, code):
		for arg in self.args:
			if arg.type.is_pyobject:
				arg.generate_deletion_code(code)
			# else error reported earlier


class PassStatNode(StatNode):
	#  pass statement
	
	def analyse_expressions(self, env):
		pass
	
	def generate_execution_code(self, code):
		pass


class BreakStatNode(StatNode):

	def analyse_expressions(self, env):
		pass
	
	def generate_execution_code(self, code):
		if not code.break_label:
			error(self.pos, "break statement not inside loop")
		else:
			#code.putln(
			#	"goto %s;" %
			#		code.break_label)
			code.put_goto(code.break_label)


class ContinueStatNode(StatNode):

	def analyse_expressions(self, env):
		pass
	
	def generate_execution_code(self, code):
		if code.in_try_finally:
			error(self.pos, "continue statement inside try of try...finally")
		elif not code.continue_label:
			error(self.pos, "continue statement not inside loop")
		else:
			#code.putln(
			#	"goto %s;" %
			#		code.continue_label)
			code.put_goto(code.continue_label)


class ReturnStatNode(StatNode):
	#  return statement
	#
	#  value         ExprNode or None
	#  return_type   PyrexType
	#  temps_in_use  [Entry]            Temps in use at time of return
	
	def analyse_expressions(self, env):
		return_type = env.return_type
		self.return_type = return_type
		self.temps_in_use = env.temps_in_use()
		if not return_type:
			error(self.pos, "Return not inside a function body")
			return
		if self.value:
			self.value.analyse_types(env)
			if return_type.is_void or return_type.is_returncode:
				error(self.value.pos, 
					"Return with value in void function")
			else:
				self.value = self.value.coerce_to(env.return_type, env)
			self.value.allocate_temps(env)
			self.value.release_temp(env)
		else:
			if (not return_type.is_void
				and not return_type.is_pyobject
				and not return_type.is_returncode):
					error(self.pos, "Return value required")
		if return_type.is_pyobject:
			self.gil_check(env)
	
	gil_message = "Returning Python object"
	
	def generate_execution_code(self, code):
		if not self.return_type:
			# error reported earlier
			return
		if self.value:
			self.value.generate_evaluation_code(code)
			self.value.make_owned_reference(code)
			code.putln(
				"%s = %s;" % (
					Naming.retval_cname,
					self.value.result_as(self.return_type)))
			self.value.generate_post_assignment_code(code)
		else:
			if self.return_type.is_pyobject:
				code.put_init_to_py_none(Naming.retval_cname, self.return_type)
			elif self.return_type.is_returncode:
				code.putln(
					"%s = %s;" % (
						Naming.retval_cname,
						self.return_type.default_value))
		for entry in self.temps_in_use:
			code.put_var_decref_clear(entry)
		#code.putln(
		#	"goto %s;" %
		#		code.return_label)
		code.put_goto(code.return_label)


class RaiseStatNode(StatNode):
	#  raise statement
	#
	#  exc_type    ExprNode or None
	#  exc_value   ExprNode or None
	#  exc_tb      ExprNode or None
	
	def analyse_expressions(self, env):
		if self.exc_type:
			self.exc_type.analyse_types(env)
			self.exc_type = self.exc_type.coerce_to_pyobject(env)
			self.exc_type.allocate_temps(env)
		if self.exc_value:
			self.exc_value.analyse_types(env)
			self.exc_value = self.exc_value.coerce_to_pyobject(env)
			self.exc_value.allocate_temps(env)
		if self.exc_tb:
			self.exc_tb.analyse_types(env)
			self.exc_tb = self.exc_tb.coerce_to_pyobject(env)
			self.exc_tb.allocate_temps(env)
		if self.exc_type:
			self.exc_type.release_temp(env)
		if self.exc_value:
			self.exc_value.release_temp(env)
		if self.exc_tb:
			self.exc_tb.release_temp(env)
#		env.use_utility_code(raise_utility_code)
		self.gil_check(env)
	
	gil_message = "Raising exception"
	
	def generate_execution_code(self, code):
		if self.exc_type:
			self.exc_type.generate_evaluation_code(code)
			type_code = self.exc_type.py_result()
		else:
			type_code = 0
		if self.exc_value:
			self.exc_value.generate_evaluation_code(code)
			value_code = self.exc_value.py_result()
		else:
			value_code = "0"
		if self.exc_tb:
			self.exc_tb.generate_evaluation_code(code)
			tb_code = self.exc_tb.py_result()
		else:
			tb_code = "0"
		if self.exc_type or self.exc_value or self.exc_tb:
			code.use_utility_code(raise_utility_code)
			code.putln(
				"__Pyx_Raise(%s, %s, %s);" % (
					type_code,
					value_code,
					tb_code))
		else:
			code.putln(
				"__Pyx_ReRaise();")
		if self.exc_type:
			self.exc_type.generate_disposal_code(code)
		if self.exc_value:
			self.exc_value.generate_disposal_code(code)
		if self.exc_tb:
			self.exc_tb.generate_disposal_code(code)
		code.putln(
			code.error_goto(self.pos))


class ReraiseStatNode(StatNode):

	def analyse_expressions(self, env):
#		env.use_utility_code(raise_utility_code)
		self.gil_check(env)
	
	gil_message = "Raising exception"

	def generate_execution_code(self, code):
		vars = code.exc_vars
		if vars:
			code.use_utility_code(raise_utility_code)
			code.putln("__Pyx_Raise(%s, %s, %s);" % tuple(vars))
			code.putln(code.error_goto(self.pos))
		else:
			error(self.pos, "Reraise not inside except clause")
		

class AssertStatNode(StatNode):
	#  assert statement
	#
	#  cond    ExprNode
	#  value   ExprNode or None
	
	def analyse_expressions(self, env):
		self.cond = self.cond.analyse_boolean_expression(env)
		if self.value:
			self.value.analyse_types(env)
			self.value = self.value.coerce_to_pyobject(env)
			self.value.allocate_temps(env)
		self.cond.release_temp(env)
		if self.value:
			self.value.release_temp(env)
		self.gil_check(env)
	
	gil_message = "Raising exception"
	
	def generate_execution_code(self, code):
		code.putln("#ifndef PYREX_WITHOUT_ASSERTIONS")
		self.cond.generate_evaluation_code(code)
		code.putln(
			"if (!%s) {" %
				self.cond.result())
		if self.value:
			self.value.generate_evaluation_code(code)
		if self.value:
			code.putln(
				"PyErr_SetObject(PyExc_AssertionError, %s);" %
					self.value.py_result())
		else:
			code.putln(
				"PyErr_SetNone(PyExc_AssertionError);")
		code.putln(
				code.error_goto(self.pos))
		code.putln(
			"}")
		self.cond.generate_disposal_code(code)
		# Disposal code for value not needed because exception always raised
		#if self.value:
		#	self.value.generate_disposal_code(code)
		code.putln("#endif")

class IfStatNode(StatNode):
	#  if statement
	#
	#  if_clauses   [IfClauseNode]
	#  else_clause  StatNode or None
	
	def analyse_declarations(self, env):
		for if_clause in self.if_clauses:
			if_clause.analyse_declarations(env)
		if self.else_clause:
			self.else_clause.analyse_declarations(env)
	
	def analyse_expressions(self, env):
		for if_clause in self.if_clauses:
			if_clause.analyse_expressions(env)
		if self.else_clause:
			self.else_clause.analyse_expressions(env)
	
	def generate_execution_code(self, code):
		end_label = code.new_label()
		for if_clause in self.if_clauses:
			if_clause.generate_execution_code(code, end_label)
		if self.else_clause:
			code.putln("/*else*/ {")
			self.else_clause.generate_execution_code(code)
			code.putln("}")
		code.put_label(end_label)


class IfClauseNode(Node):
	#  if or elif clause in an if statement
	#
	#  condition   ExprNode
	#  body        StatNode
	
	def analyse_declarations(self, env):
		self.condition.analyse_declarations(env)
		self.body.analyse_declarations(env)
	
	def analyse_expressions(self, env):
		self.condition = \
			self.condition.analyse_temp_boolean_expression(env)
		self.condition.release_temp(env)
		self.body.analyse_expressions(env)
	
	def generate_execution_code(self, code, end_label):
		self.condition.generate_evaluation_code(code)
		code.putln(
			"if (%s) {" %
				self.condition.result())
		self.body.generate_execution_code(code)
		#code.putln(
		#	"goto %s;" %
		#		end_label)
		code.put_goto(end_label)
		code.putln("}")
		
	
class WhileStatNode(StatNode):
	#  while statement
	#
	#  condition    ExprNode
	#  body         StatNode
	#  else_clause  StatNode
	
	def analyse_declarations(self, env):
		self.body.analyse_declarations(env)
		if self.else_clause:
			self.else_clause.analyse_declarations(env)
	
	def analyse_expressions(self, env):
		self.condition = \
			self.condition.analyse_temp_boolean_expression(env)
		self.condition.release_temp(env)
		#env.recycle_pending_temps() # TEMPORARY
		self.body.analyse_expressions(env)
		if self.else_clause:
			self.else_clause.analyse_expressions(env)
	
	def generate_execution_code(self, code):
		old_loop_labels = code.new_loop_labels()
		code.putln(
			"while (1) {")
		self.condition.generate_evaluation_code(code)
		code.putln(
			"if (!%s) break;" %
				self.condition.result())
		self.body.generate_execution_code(code)
		code.put_label(code.continue_label)
		code.putln("}")
		break_label = code.break_label
		code.set_loop_labels(old_loop_labels)
		if self.else_clause:
			code.putln("/*else*/ {")
			self.else_clause.generate_execution_code(code)
			code.putln("}")
		code.put_label(break_label)


class ForInStatNode(StatNode):
	#  for statement
	#
	#  target        ExprNode
	#  iterator      IteratorNode
	#  body          StatNode
	#  else_clause   StatNode
	#  item          NextNode       used internally
	
	def analyse_declarations(self, env):
		self.target.analyse_target_declaration(env)
		self.body.analyse_declarations(env)
		if self.else_clause:
			self.else_clause.analyse_declarations(env)
	
	def analyse_expressions(self, env):
		import ExprNodes
		self.iterator.analyse_expressions(env)
		self.target.analyse_target_types(env)
		self.item = ExprNodes.NextNode(self.iterator, env)
		self.item = self.item.coerce_to(self.target.type, env)
		self.item.allocate_temps(env)
		self.target.allocate_target_temps(env, self.item)
		#self.item.release_temp(env)
		#self.target.release_target_temp(env)
		self.body.analyse_expressions(env)
		if self.else_clause:
			self.else_clause.analyse_expressions(env)
		self.iterator.release_temp(env)

	def generate_execution_code(self, code):
		old_loop_labels = code.new_loop_labels()
		self.iterator.generate_evaluation_code(code)
		code.putln(
			"for (;;) {")
		self.item.generate_evaluation_code(code)
		self.target.generate_assignment_code(self.item, code)
		self.body.generate_execution_code(code)
		code.put_label(code.continue_label)
		code.putln(
			"}")
		break_label = code.break_label
		code.set_loop_labels(old_loop_labels)
		if self.else_clause:
			code.putln("/*else*/ {")
			self.else_clause.generate_execution_code(code)
			code.putln("}")
		code.put_label(break_label)
		self.iterator.generate_disposal_code(code)


class IntegerForStatNode(StatNode):
	#  for expr rel name rel expr
	#
	#  bound1        ExprNode
	#  relation1     string
	#  target        NameNode
	#  relation2     string
	#  bound2        ExprNode
	#  body          StatNode
	#  else_clause   StatNode or None
	#
	#  Used internally:
	#
	#  is_py_target       bool
	#  loopvar_name       string
	#  py_loopvar_node    PyTempNode or None
	
	def analyse_declarations(self, env):
		self.target.analyse_target_declaration(env)
		self.body.analyse_declarations(env)
		if self.else_clause:
			self.else_clause.analyse_declarations(env)

	def analyse_expressions(self, env):
		import ExprNodes
		self.target.analyse_target_types(env)
		self.bound1.analyse_types(env)
		self.bound2.analyse_types(env)
		self.bound1 = self.bound1.coerce_to_integer(env)
		self.bound2 = self.bound2.coerce_to_integer(env)
		if not (self.bound2.is_name or self.bound2.is_literal):
			self.bound2 = self.bound2.coerce_to_temp(env)
		target_type = self.target.type
		if not (target_type.is_pyobject or target_type.is_int):
			error(self.target.pos,
				"Integer for-loop variable must be of type int or Python object")
		#if not (target_type.is_pyobject
		#	or target_type.assignable_from(PyrexTypes.c_int_type)):
		#		error(self.target.pos,
		#			"Cannot assign integer to variable of type '%s'" % target_type)
		if target_type.is_int:
			self.is_py_target = 0
			self.loopvar_name = self.target.entry.cname
			self.py_loopvar_node = None
		else:
			self.is_py_target = 1
			c_loopvar_node = ExprNodes.TempNode(self.pos, 
				PyrexTypes.c_long_type, env)
			c_loopvar_node.allocate_temps(env)
			self.loopvar_name = c_loopvar_node.result()
			self.py_loopvar_node = \
				ExprNodes.CloneNode(c_loopvar_node).coerce_to_pyobject(env)
		self.bound1.allocate_temps(env)
		self.bound2.allocate_temps(env)
		if self.is_py_target:
			self.py_loopvar_node.allocate_temps(env)
			self.target.allocate_target_temps(env, self.py_loopvar_node)
			#self.target.release_target_temp(env)
			#self.py_loopvar_node.release_temp(env)
		self.body.analyse_expressions(env)
		if self.is_py_target:
			c_loopvar_node.release_temp(env)
		if self.else_clause:
			self.else_clause.analyse_expressions(env)
		self.bound1.release_temp(env)
		self.bound2.release_temp(env)
			
	def generate_execution_code(self, code):
		old_loop_labels = code.new_loop_labels()
		self.bound1.generate_evaluation_code(code)
		self.bound2.generate_evaluation_code(code)
		offset, incop = self.relation_table[self.relation1]
		code.putln(
			"for (%s = %s%s; %s %s %s; %s%s) {" % (
				self.loopvar_name,
				self.bound1.result(), offset,
				self.loopvar_name, self.relation2, self.bound2.result(),
				incop, self.loopvar_name))
		if self.py_loopvar_node:
			self.py_loopvar_node.generate_evaluation_code(code)
			self.target.generate_assignment_code(self.py_loopvar_node, code)
		self.body.generate_execution_code(code)
		code.put_label(code.continue_label)
		code.putln("}")
		break_label = code.break_label
		code.set_loop_labels(old_loop_labels)
		if self.else_clause:
			code.putln("/*else*/ {")
			self.else_clause.generate_execution_code(code)
			code.putln("}")
		code.put_label(break_label)
		self.bound1.generate_disposal_code(code)
		self.bound2.generate_disposal_code(code)
	
	relation_table = {
		# {relop : (initial offset, increment op)}
		'<=': ("",   "++"),
		'<' : ("+1", "++"),
		'>=': ("",   "--"),
		'>' : ("-1", "--")
	}


class TryExceptStatNode(StatNode):
	#  try .. except statement
	#
	#  body             StatNode
	#  except_clauses   [ExceptClauseNode]
	#  else_clause      StatNode or None
	#  cleanup_list     [Entry]            temps to clean up on error
	
	def analyse_declarations(self, env):
		self.body.analyse_declarations(env)
		for except_clause in self.except_clauses:
			except_clause.analyse_declarations(env)
		if self.else_clause:
			self.else_clause.analyse_declarations(env)
		self.gil_check(env)
	
	def analyse_expressions(self, env):
		self.body.analyse_expressions(env)
		self.cleanup_list = env.free_temp_entries[:]
		for except_clause in self.except_clauses:
			except_clause.analyse_expressions(env)
		if self.else_clause:
			self.else_clause.analyse_expressions(env)
		self.gil_check(env)
	
	gil_message = "Try-except statement"
	
	def generate_execution_code(self, code):
		old_error_label = code.new_error_label()
		our_error_label = code.error_label
		end_label = code.new_label()
		code.putln(
			"/*try:*/ {")
		self.body.generate_execution_code(code)
		code.putln(
			"}")
		code.error_label = old_error_label
		if self.else_clause:
			code.putln(
				"/*else:*/ {")
			self.else_clause.generate_execution_code(code)
			code.putln(
				"}")
		code.put_goto(end_label)
		code.put_label(our_error_label)
		code.put_var_xdecrefs_clear(self.cleanup_list)
		default_clause_seen = 0
		for except_clause in self.except_clauses:
			if not except_clause.pattern:
				default_clause_seen = 1
			else:
				if default_clause_seen:
					error(except_clause.pos, "Default except clause not last")
			except_clause.generate_handling_code(code, end_label)
		if not default_clause_seen:
			code.put_goto(code.error_label)
		code.put_label(end_label)


class ExceptClauseNode(Node):
	#  Part of try ... except statement.
	#
	#  pattern        ExprNode
	#  target         ExprNode or None
	#  body           StatNode
	#  match_flag     string             result of exception match
	#  exc_value      ExcValueNode       used internally
	#  function_name  string             qualified name of enclosing function
	#  exc_vars       (string * 3)       local exception variables
	
	def analyse_declarations(self, env):
		if self.target:
			self.target.analyse_target_declaration(env)
		self.body.analyse_declarations(env)
	
	def analyse_expressions(self, env):
		import ExprNodes
		genv = env.global_scope()
		self.function_name = env.qualified_name
		if self.pattern:
			self.pattern.analyse_expressions(env)
			self.pattern = self.pattern.coerce_to_pyobject(env)
			self.match_flag = env.allocate_temp(PyrexTypes.c_int_type)
			self.pattern.release_temp(env)
			env.release_temp(self.match_flag)
		self.exc_vars = [env.allocate_temp(py_object_type) for i in xrange(3)]
		if self.target:
			self.exc_value = ExprNodes.ExcValueNode(self.pos, env, self.exc_vars[1])
			self.exc_value.allocate_temps(env)
			self.target.analyse_target_expression(env, self.exc_value)
		self.body.analyse_expressions(env)
		for var in self.exc_vars:
			env.release_temp(var)
#		env.use_utility_code(get_exception_utility_code)

	def generate_handling_code(self, code, end_label):
		code.mark_pos(self.pos)
		if self.pattern:
			self.pattern.generate_evaluation_code(code)
			code.putln(
				"%s = PyErr_ExceptionMatches(%s);" % (
					self.match_flag,
					self.pattern.py_result()))
			self.pattern.generate_disposal_code(code)
			code.putln(
				"if (%s) {" %
					self.match_flag)
		else:
			code.putln(
				"/*except:*/ {")
		code.putln(
			'__Pyx_AddTraceback("%s");' % (self.function_name))
		# We always have to fetch the exception value even if
		# there is no target, because this also normalises the 
		# exception and stores it in the thread state.
		exc_args = "&%s, &%s, &%s" % tuple(self.exc_vars)
		code.use_utility_code(get_exception_utility_code)
		code.putln("if (__Pyx_GetException(%s) < 0) %s" % (exc_args,
			code.error_goto(self.pos)))
		if self.target:
			self.exc_value.generate_evaluation_code(code)
			self.target.generate_assignment_code(self.exc_value, code)
		old_exc_vars = code.exc_vars
		code.exc_vars = self.exc_vars
		self.body.generate_execution_code(code)
		code.exc_vars = old_exc_vars
		for var in self.exc_vars:
			code.putln("Py_DECREF(%s); %s = 0;" % (var, var))
		code.put_goto(end_label)
		code.putln(
			"}")


class TryFinallyStatNode(StatNode):
	#  try ... finally statement
	#
	#  body             StatNode
	#  finally_clause   StatNode
	#
	#  cleanup_list     [Entry]      temps to clean up on error
	#
	#  The plan is that we funnel all continue, break
	#  return and error gotos into the beginning of the
	#  finally block, setting a variable to remember which
	#  one we're doing. At the end of the finally block, we
	#  switch on the variable to figure out where to go.
	#  In addition, if we're doing an error, we save the
	#  exception on entry to the finally block and restore
	#  it on exit.
	
	preserve_exception = 1
	
	disallow_continue_in_try_finally = 0
	# There doesn't seem to be any point in disallowing
	# continue in the try block, since we have no problem
	# handling it.
	
	def analyse_declarations(self, env):
		self.body.analyse_declarations(env)
		self.finally_clause.analyse_declarations(env)
	
	def analyse_expressions(self, env):
		self.body.analyse_expressions(env)
		self.cleanup_list = env.free_temp_entries[:]
		self.finally_clause.analyse_expressions(env)
		self.gil_check(env)
	
	gil_message = "Try-finally statement"
	
	def generate_execution_code(self, code):
		old_error_label = code.error_label
		old_labels = code.all_new_labels()
		new_labels = code.get_all_labels()
		new_error_label = code.error_label
		catch_label = code.new_label()
		code.putln(
			"/*try:*/ {")
		if self.disallow_continue_in_try_finally:
			was_in_try_finally = code.in_try_finally
			code.in_try_finally = 1
		self.body.generate_execution_code(code)
		if self.disallow_continue_in_try_finally:
			code.in_try_finally = was_in_try_finally
		code.putln(
			"}")
		code.putln(
			"/*finally:*/ {")
		cases_used = []
		error_label_used = 0
		for i, new_label in enumerate(new_labels):
			if new_label in code.labels_used:
				cases_used.append(i)
				if new_label == new_error_label:
					error_label_used = 1
					error_label_case = i
		if cases_used:
			code.putln(
					"int __pyx_why;")
			if error_label_used and self.preserve_exception:
				code.putln(
					"PyObject *%s, *%s, *%s;" % Naming.exc_vars)
				code.putln(
					"int %s;" % Naming.exc_lineno_name)
			code.use_label(catch_label)
			code.putln(
					"__pyx_why = 0; goto %s;" % catch_label)
			for i in cases_used:
				new_label = new_labels[i]
				#if new_label and new_label <> "<try>":
				if new_label == new_error_label and self.preserve_exception:
					self.put_error_catcher(code, 
						new_error_label, i+1, catch_label)
				else:
					code.putln(
						"%s: __pyx_why = %s; goto %s;" % (
							new_label,
							i+1,
							catch_label))
			code.put_label(catch_label)
		code.set_all_labels(old_labels)
		if error_label_used:
			code.new_error_label()
			finally_error_label = code.error_label
		self.finally_clause.generate_execution_code(code)
		if error_label_used:
			if finally_error_label in code.labels_used and self.preserve_exception:
				over_label = code.new_label()
				code.put_goto(over_label);
				code.put_label(finally_error_label)
				code.putln("if (__pyx_why == %d) {" % (error_label_case + 1))
				for var in Naming.exc_vars:
					code.putln("Py_XDECREF(%s);" % var)
				code.putln("}")
				code.put_goto(old_error_label)
				code.put_label(over_label)
			code.error_label = old_error_label
		if cases_used:
			code.putln(
				"switch (__pyx_why) {")
			for i in cases_used:
				old_label = old_labels[i]
				if old_label == old_error_label and self.preserve_exception:
					self.put_error_uncatcher(code, i+1, old_error_label)
				else:
					code.use_label(old_label)
					code.putln(
						"case %s: goto %s;" % (
							i+1,
							old_label))
			code.putln(
				"}")		
		code.putln(
			"}")

	def put_error_catcher(self, code, error_label, i, catch_label):
		code.putln(
			"%s: {" %
				error_label)
		code.putln(
				"__pyx_why = %s;" %
					i)
		code.put_var_xdecrefs_clear(self.cleanup_list)
		code.putln(
				"PyErr_Fetch(&%s, &%s, &%s);" %
					Naming.exc_vars)
		code.putln(
				"%s = %s;" % (
					Naming.exc_lineno_name, Naming.lineno_cname))
		#code.putln(
		#		"goto %s;" %
		#			catch_label)
		code.put_goto(catch_label)
		code.putln(
			"}")
			
	def put_error_uncatcher(self, code, i, error_label):
		code.putln(
			"case %s: {" %
				i)
		code.putln(
				"PyErr_Restore(%s, %s, %s);" %
					Naming.exc_vars)
		code.putln(
				"%s = %s;" % (
					Naming.lineno_cname, Naming.exc_lineno_name))
		for var in Naming.exc_vars:
			code.putln(
				"%s = 0;" %
					var)
		code.put_goto(error_label)
		code.putln(
			"}")


class GILStatNode(TryFinallyStatNode):
	#  'with gil' or 'with nogil' statement
	#
	#   state   string   'gil' or 'nogil'
		
	preserve_exception = 0

	def __init__(self, pos, state, body):
		self.state = state
		TryFinallyStatNode.__init__(self, pos,
			body = body,
			finally_clause = GILExitNode(pos, state = state))

	def analyse_expressions(self, env):
		was_nogil = env.nogil
		env.nogil = 1
		TryFinallyStatNode.analyse_expressions(self, env)
		env.nogil = was_nogil
	
	def gil_check(self, env):
		pass

	def generate_execution_code(self, code):
		code.putln("/*with %s:*/ {" % self.state)
		if self.state == 'gil':
			code.putln("PyGILState_STATE _save = PyGILState_Ensure();")
		else:
			code.putln("PyThreadState *_save;")
			code.putln("Py_UNBLOCK_THREADS")
		TryFinallyStatNode.generate_execution_code(self, code)
		code.putln("}")


class GILExitNode(StatNode):
	#  Used as the 'finally' block in a GILStatNode
	#
	#  state   string   'gil' or 'nogil'

	def analyse_expressions(self, env):
		pass

	def generate_execution_code(self, code):
		if self.state == 'gil':
			code.putln("PyGILState_Release();")
		else:
			code.putln("Py_BLOCK_THREADS")


class CImportStatNode(StatNode):
	#  cimport statement
	#
	#  module_name   string           Qualified name of module being imported
	#  as_name       string or None   Name specified in "as" clause, if any
	
	def analyse_declarations(self, env):
		module_scope = env.find_module(self.module_name, self.pos)
		if "." in self.module_name:
			names = self.module_name.split(".")
			top_name = names[0]
			top_module_scope = env.context.find_submodule(top_name)
			module_scope = top_module_scope
			for name in names[1:]:
				submodule_scope = module_scope.find_submodule(name)
				module_scope.declare_module(name, submodule_scope, self.pos)
				if not self.as_name:
					env.add_imported_module(submodule_scope)
				module_scope = submodule_scope
			if self.as_name:
				env.declare_module(self.as_name, module_scope, self.pos)
				env.add_imported_module(module_scope)
			else:
				env.declare_module(top_name, top_module_scope, self.pos)
				env.add_imported_module(top_module_scope)
		else:
			name = self.as_name or self.module_name
			env.declare_module(name, module_scope, self.pos)
			env.add_imported_module(module_scope)

	def analyse_expressions(self, env):
		pass
	
	def generate_execution_code(self, code):
		pass
	

class FromCImportStatNode(StatNode):
	#  from ... cimport statement
	#
	#  module_name     string                  Qualified name of module
	#  imported_names  Parsing.ImportedName    Names to be imported
	
	def analyse_declarations(self, env):
		module_scope = env.find_module(self.module_name, self.pos)
		env.add_imported_module(module_scope)
		for imp in self.imported_names:
			kind = imp.kind
			#entry = module_scope.find(imp.name, imp.pos)
			entry = module_scope.lookup(imp.name)
			if entry:
				if kind and not self.declaration_matches(entry, kind):
					entry.redeclared(pos)
			else:
				if kind == 'struct' or kind == 'union':
					entry = module_scope.declare_struct_or_union(imp.name,
						kind = kind, scope = None, typedef_flag = 0, pos = imp.pos)
				elif kind == 'class':
					entry = module_scope.declare_c_class(imp.name, pos = imp.pos,
						module_name = self.module_name)
				else:
					error(imp.pos, "Name '%s' not declared in module '%s'"
						% (imp.name, self.module_name)) 
			if entry:
				local_name = imp.as_name or imp.name
				env.add_imported_entry(local_name, entry, imp.pos)
	
	def declaration_matches(self, entry, kind):
		if not entry.is_type:
			return 0
		type = entry.type
		if kind == 'class':
			if not type.is_extension_type:
				return 0
		else:
			if not type.is_struct_or_union:
				return 0
			if kind <> type.kind:
				return 0
		return 1

	def analyse_expressions(self, env):
		pass
	
	def generate_execution_code(self, code):
		pass


class FromImportStatNode(StatNode):
	#  from ... import statement
	#
	#  module           ImportNode
	#  items            [(string, NameNode)]
	#  #interned_items   [(string, NameNode)]
	#  item             PyTempNode            used internally
	
	def analyse_declarations(self, env):
		for _, target in self.items:
			target.analyse_target_declaration(env)
	
	def analyse_expressions(self, env):
		import ExprNodes
		self.module.analyse_expressions(env)
		self.item = ExprNodes.PyTempNode(self.pos, env)
		self.item.allocate_temp(env)
		#self.interned_items = []
		for name, target in self.items:
			#self.interned_items.append((env.intern(name), target))
			target.analyse_target_expression(env, None)
		self.module.release_temp(env)
		self.item.release_temp(env)
	
	def generate_execution_code(self, code):
		self.module.generate_evaluation_code(code)
		#for cname, target in self.interned_items:
		for name, target in self.items:
			cname = code.intern(name)
			code.putln(
				'%s = PyObject_GetAttr(%s, %s); if (!%s) %s' % (
					self.item.result(), 
					self.module.py_result(),
					cname,
					self.item.result(),
					code.error_goto(self.pos)))
			target.generate_assignment_code(self.item, code)
		self.module.generate_disposal_code(code)

#------------------------------------------------------------------------------------
#
#  Runtime support code
#
#------------------------------------------------------------------------------------

#utility_function_predeclarations = \
#"""
#typedef struct {PyObject **p; char *s;} __Pyx_InternTabEntry; /*proto*/
#typedef struct {PyObject **p; char *s; long n;} __Pyx_StringTabEntry; /*proto*/
#"""

utility_function_predeclarations = \
"""
typedef struct {PyObject **p; int i; char *s; long n;} __Pyx_StringTabEntry; /*proto*/
"""

#get_name_predeclaration = \
#"static PyObject *__Pyx_GetName(PyObject *dict, char *name); /*proto*/"

#get_name_interned_predeclaration = \
#"static PyObject *__Pyx_GetName(PyObject *dict, PyObject *name); /*proto*/"

#------------------------------------------------------------------------------------

printing_utility_code = [
"""
static int __Pyx_PrintItem(PyObject *); /*proto*/
static int __Pyx_PrintNewline(void); /*proto*/
""",r"""
static PyObject *__Pyx_GetStdout(void) {
	PyObject *f = PySys_GetObject("stdout");
	if (!f) {
		PyErr_SetString(PyExc_RuntimeError, "lost sys.stdout");
	}
	return f;
}

static int __Pyx_PrintItem(PyObject *v) {
	PyObject *f;
	
	if (!(f = __Pyx_GetStdout()))
		return -1;
	if (PyFile_SoftSpace(f, 1)) {
		if (PyFile_WriteString(" ", f) < 0)
			return -1;
	}
	if (PyFile_WriteObject(v, f, Py_PRINT_RAW) < 0)
		return -1;
	if (PyString_Check(v)) {
		char *s = PyString_AsString(v);
		Py_ssize_t len = PyString_Size(v);
		if (len > 0 &&
			isspace(Py_CHARMASK(s[len-1])) &&
			s[len-1] != ' ')
				PyFile_SoftSpace(f, 0);
	}
	return 0;
}

static int __Pyx_PrintNewline(void) {
	PyObject *f;
	
	if (!(f = __Pyx_GetStdout()))
		return -1;
	if (PyFile_WriteString("\n", f) < 0)
		return -1;
	PyFile_SoftSpace(f, 0);
	return 0;
}
"""]

#------------------------------------------------------------------------------------

# The following function is based on do_raise() from ceval.c.

raise_utility_code = [
"""
static void __Pyx_Raise(PyObject *type, PyObject *value, PyObject *tb); /*proto*/
""","""
static void __Pyx_Raise(PyObject *type, PyObject *value, PyObject *tb) {
	Py_XINCREF(type);
	Py_XINCREF(value);
	Py_XINCREF(tb);
	/* First, check the traceback argument, replacing None with NULL. */
	if (tb == Py_None) {
		Py_DECREF(tb);
		tb = 0;
	}
	else if (tb != NULL && !PyTraceBack_Check(tb)) {
		PyErr_SetString(PyExc_TypeError,
			"raise: arg 3 must be a traceback or None");
		goto raise_error;
	}
	/* Next, replace a missing value with None */
	if (value == NULL) {
		value = Py_None;
		Py_INCREF(value);
	}
	#if PY_VERSION_HEX < 0x02050000
	if (!PyClass_Check(type))
	#else
	if (!PyType_Check(type))
	#endif
	{
		/* Raising an instance.  The value should be a dummy. */
		if (value != Py_None) {
			PyErr_SetString(PyExc_TypeError,
				"instance exception may not have a separate value");
			goto raise_error;
		}
		/* Normalize to raise <class>, <instance> */
		Py_DECREF(value);
		value = type;
		#if PY_VERSION_HEX < 0x02050000
			if (PyInstance_Check(type)) {
				type = (PyObject*) ((PyInstanceObject*)type)->in_class;
				Py_INCREF(type);
			}
			else {
				PyErr_SetString(PyExc_TypeError,
					"raise: exception must be an old-style class or instance");
				goto raise_error;
			}
		#else
			type = (PyObject*) type->ob_type;
			Py_INCREF(type);
			if (!PyType_IsSubtype((PyTypeObject *)type, (PyTypeObject *)PyExc_BaseException)) {
				PyErr_SetString(PyExc_TypeError,
					"raise: exception class must be a subclass of BaseException");
				goto raise_error;
			}
		#endif
	}
	PyErr_Restore(type, value, tb);
	return;
raise_error:
	Py_XDECREF(value);
	Py_XDECREF(type);
	Py_XDECREF(tb);
	return;
}
"""]

#------------------------------------------------------------------------------------

reraise_utility_code = [
"""
static void __Pyx_ReRaise(void); /*proto*/
""","""
static void __Pyx_ReRaise(void) {
	PyThreadState *tstate = PyThreadState_Get();
	PyObject *type = tstate->exc_type;
	PyObject *value = tstate->exc_value;
	PyObject *tb = tstate->exc_traceback;
	Py_XINCREF(type);
	Py_XINCREF(value);
	Py_XINCREF(tb);
	PyErr_Restore(type, value, tb);
}
"""]

#------------------------------------------------------------------------------------

arg_type_test_utility_code = [
"""
static int __Pyx_ArgTypeTest(PyObject *obj, PyTypeObject *type, int none_allowed, char *name); /*proto*/
""","""
static int __Pyx_ArgTypeTest(PyObject *obj, PyTypeObject *type, int none_allowed, char *name) {
	if (!type) {
		PyErr_Format(PyExc_SystemError, "Missing type object");
		return 0;
	}
	if ((none_allowed && obj == Py_None) || PyObject_TypeCheck(obj, type))
		return 1;
	PyErr_Format(PyExc_TypeError,
		"Argument '%s' has incorrect type (expected %s, got %s)",
		name, type->tp_name, obj->ob_type->tp_name);
	return 0;
}
"""]

#------------------------------------------------------------------------------------
#
#  __Pyx_GetStarArgs splits the args tuple and kwds dict into two parts
#  each, one part suitable for passing to PyArg_ParseTupleAndKeywords,
#  and the other containing any extra arguments. On success, replaces
#  the borrowed references *args and *kwds with references to a new
#  tuple and dict, and passes back new references in *args2 and *kwds2.
#  Does not touch any of its arguments on failure.
#
#  Any of *kwds, args2 and kwds2 may be 0 (but not args or kwds). If
#  *kwds == 0, it is not changed. If kwds2 == 0 and *kwds != 0, a new
#  reference to the same dictionary is passed back in *kwds.
#
#  If rqd_kwds is not 0, it is an array of booleans corresponding to the
#  names in kwd_list, indicating required keyword arguments. If any of
#  these are not present in kwds, an exception is raised.
#

get_starargs_utility_code = [
"""
static int __Pyx_GetStarArgs(PyObject **args, PyObject **kwds, char *kwd_list[], \
	Py_ssize_t nargs, PyObject **args2, PyObject **kwds2, char rqd_kwds[]); /*proto*/
""","""
static int __Pyx_GetStarArgs(
	PyObject **args, 
	PyObject **kwds,
	char *kwd_list[], 
	Py_ssize_t nargs,
	PyObject **args2, 
	PyObject **kwds2,
	char rqd_kwds[])
{
	PyObject *x = 0, *args1 = 0, *kwds1 = 0;
	int i;
	char **p;
	
	if (args2)
		*args2 = 0;
	if (kwds2)
		*kwds2 = 0;
	
	if (args2) {
		args1 = PyTuple_GetSlice(*args, 0, nargs);
		if (!args1)
			goto bad;
		*args2 = PyTuple_GetSlice(*args, nargs, PyTuple_GET_SIZE(*args));
		if (!*args2)
			goto bad;
	}
	else if (PyTuple_GET_SIZE(*args) > nargs) {
		int m = nargs;
		int n = PyTuple_GET_SIZE(*args);
		PyErr_Format(PyExc_TypeError,
			"function takes at most %d positional arguments (%d given)",
				m, n);
		goto bad;
	}
	else {
		args1 = *args;
		Py_INCREF(args1);
	}
	
	if (rqd_kwds && !*kwds)
			for (i = 0, p = kwd_list; *p; i++, p++)
				if (rqd_kwds[i])
					goto missing_kwarg;
	
	if (kwds2) {
		if (*kwds) {
			kwds1 = PyDict_New();
			if (!kwds1)
				goto bad;
			*kwds2 = PyDict_Copy(*kwds);
			if (!*kwds2)
				goto bad;
			for (i = 0, p = kwd_list; *p; i++, p++) {
				x = PyDict_GetItemString(*kwds, *p);
				if (x) {
					if (PyDict_SetItemString(kwds1, *p, x) < 0)
						goto bad;
					if (PyDict_DelItemString(*kwds2, *p) < 0)
						goto bad;
				}
				else if (rqd_kwds && rqd_kwds[i])
					goto missing_kwarg;
			}
		}
		else {
			*kwds2 = PyDict_New();
			if (!*kwds2)
				goto bad;
		}
	}
	else {
		kwds1 = *kwds;
		Py_XINCREF(kwds1);
		if (rqd_kwds && *kwds)
			for (i = 0, p = kwd_list; *p; i++, p++)
				if (rqd_kwds[i] && !PyDict_GetItemString(*kwds, *p))
						goto missing_kwarg;
	}
	
	*args = args1;
	*kwds = kwds1;
	return 0;
missing_kwarg:
	PyErr_Format(PyExc_TypeError,
		"required keyword argument '%s' is missing", *p);
bad:
	Py_XDECREF(args1);
	Py_XDECREF(kwds1);
	if (args2) {
		Py_XDECREF(*args2);
	}
	if (kwds2) {
		Py_XDECREF(*kwds2);
	}
	return -1;
}
"""]

#------------------------------------------------------------------------------------

unraisable_exception_utility_code = [
"""
static void __Pyx_WriteUnraisable(char *name); /*proto*/
""","""
static void __Pyx_WriteUnraisable(char *name) {
	PyObject *old_exc, *old_val, *old_tb;
	PyObject *ctx;
	PyErr_Fetch(&old_exc, &old_val, &old_tb);
	ctx = PyString_FromString(name);
	PyErr_Restore(old_exc, old_val, old_tb);
	if (!ctx)
		ctx = Py_None;
	PyErr_WriteUnraisable(ctx);
}
"""]

#------------------------------------------------------------------------------------

traceback_utility_code = [
"""
static void __Pyx_AddTraceback(char *funcname); /*proto*/
""","""
#include "compile.h"
#include "frameobject.h"
#include "traceback.h"

static void __Pyx_AddTraceback(char *funcname) {
	PyObject *py_srcfile = 0;
	PyObject *py_funcname = 0;
	PyObject *py_globals = 0;
	PyObject *empty_tuple = 0;
	PyObject *empty_string = 0;
	PyCodeObject *py_code = 0;
	PyFrameObject *py_frame = 0;
	
	py_srcfile = PyString_FromString(%(FILENAME)s);
	if (!py_srcfile) goto bad;
	py_funcname = PyString_FromString(funcname);
	if (!py_funcname) goto bad;
	py_globals = PyModule_GetDict(%(GLOBALS)s);
	if (!py_globals) goto bad;
	empty_tuple = PyTuple_New(0);
	if (!empty_tuple) goto bad;
	empty_string = PyString_FromString("");
	if (!empty_string) goto bad;
	py_code = PyCode_New(
		0,            /*int argcount,*/
		0,            /*int nlocals,*/
		0,            /*int stacksize,*/
		0,            /*int flags,*/
		empty_string, /*PyObject *code,*/
		empty_tuple,  /*PyObject *consts,*/
		empty_tuple,  /*PyObject *names,*/
		empty_tuple,  /*PyObject *varnames,*/
		empty_tuple,  /*PyObject *freevars,*/
		empty_tuple,  /*PyObject *cellvars,*/
		py_srcfile,   /*PyObject *filename,*/
		py_funcname,  /*PyObject *name,*/
		%(LINENO)s,   /*int firstlineno,*/
		empty_string  /*PyObject *lnotab*/
	);
	if (!py_code) goto bad;
	py_frame = PyFrame_New(
		PyThreadState_Get(), /*PyThreadState *tstate,*/
		py_code,             /*PyCodeObject *code,*/
		py_globals,          /*PyObject *globals,*/
		0                    /*PyObject *locals*/
	);
	if (!py_frame) goto bad;
	py_frame->f_lineno = %(LINENO)s;
	PyTraceBack_Here(py_frame);
bad:
	Py_XDECREF(py_srcfile);
	Py_XDECREF(py_funcname);
	Py_XDECREF(empty_tuple);
	Py_XDECREF(empty_string);
	Py_XDECREF(py_code);
	Py_XDECREF(py_frame);
}
""" % {
	'FILENAME': Naming.filename_cname,
	'LINENO':  Naming.lineno_cname,
	'GLOBALS': Naming.module_cname
}]

#------------------------------------------------------------------------------------

set_vtable_utility_code = [
"""
static int __Pyx_SetVtable(PyObject *dict, void *vtable); /*proto*/
""","""
static int __Pyx_SetVtable(PyObject *dict, void *vtable) {
	PyObject *pycobj = 0;
	int result;
	
	pycobj = PyCObject_FromVoidPtr(vtable, 0);
	if (!pycobj)
		goto bad;
	if (PyDict_SetItemString(dict, "__pyx_vtable__", pycobj) < 0)
		goto bad;
	result = 0;
	goto done;

bad:
	result = -1;
done:
	Py_XDECREF(pycobj);
	return result;
}
"""]

#------------------------------------------------------------------------------------

get_vtable_utility_code = [
"""
static int __Pyx_GetVtable(PyObject *dict, void *vtabptr); /*proto*/
""",r"""
static int __Pyx_GetVtable(PyObject *dict, void *vtabptr) {
	int result;
	PyObject *pycobj;
	
	pycobj = PyMapping_GetItemString(dict, "__pyx_vtable__");
	if (!pycobj)
		goto bad;
	*(void **)vtabptr = PyCObject_AsVoidPtr(pycobj);
	if (!*(void **)vtabptr)
		goto bad;
	result = 0;
	goto done;

bad:
	result = -1;
done:
	Py_XDECREF(pycobj);
	return result;
}
"""]

#------------------------------------------------------------------------------------

#init_intern_tab_utility_code = [
#"""
#static int __Pyx_InternStrings(__Pyx_InternTabEntry *t); /*proto*/
#""","""
#static int __Pyx_InternStrings(__Pyx_InternTabEntry *t) {
#	while (t->p) {
#		*t->p = PyString_InternFromString(t->s);
#		if (!*t->p)
#			return -1;
#		++t;
#	}
#	return 0;
#}
#"""]

#init_intern_tab_utility_code = [
#"""
#static int __Pyx_InternStrings(PyObject **t[]); /*proto*/
#""","""
#static int __Pyx_InternStrings(PyObject **t[]) {
#	while (*t) {
#		PyString_InternInPlace(*t);
#		if (!**t)
#			return -1;
#		++t;
#	}
#	return 0;
#}
#"""]

#------------------------------------------------------------------------------------

init_string_tab_utility_code = [
"""
static int __Pyx_InitStrings(__Pyx_StringTabEntry *t); /*proto*/
""","""
static int __Pyx_InitStrings(__Pyx_StringTabEntry *t) {
	while (t->p) {
		*t->p = PyString_FromStringAndSize(t->s, t->n - 1);
		if (!*t->p)
			return -1;
		if (t->i)
			PyString_InternInPlace(t->p);
		++t;
	}
	return 0;
}
"""]

#------------------------------------------------------------------------------------

get_exception_utility_code = [
"""
static int __Pyx_GetException(PyObject **type, PyObject **value, PyObject **tb); /*proto*/
""","""
static int __Pyx_GetException(PyObject **type, PyObject **value, PyObject **tb) {
	PyThreadState *tstate = PyThreadState_Get();
	PyErr_Fetch(type, value, tb);
	PyErr_NormalizeException(type, value, tb);
	if (PyErr_Occurred())
		goto bad;
	Py_INCREF(*type);
	Py_INCREF(*value);
	Py_INCREF(*tb);
	Py_XDECREF(tstate->exc_type);
	Py_XDECREF(tstate->exc_value);
	Py_XDECREF(tstate->exc_traceback);
	tstate->exc_type = *type;
	tstate->exc_value = *value;
	tstate->exc_traceback = *tb;
	return 0;
bad:
	Py_XDECREF(*type);
	Py_XDECREF(*value);
	Py_XDECREF(*tb);
	return -1;
}
"""]

#------------------------------------------------------------------------------------