Lichen (annotate translator.py in e67ebeaf5626)

Lichen

Annotated translator.py

988:cfdcae64b86f 1032:7b9b59b4501f

1028:e67ebeaf5626

987:80a84e8695d5

5 months ago

Paul Boddie

Merged changes from the default branch.

trailing-data

paul@113	1	#!/usr/bin/env python
paul@113	2
paul@113	3	"""
paul@113	4	Translate programs.
paul@113	5
paul@828	6	Copyright (C) 2015, 2016, 2017, 2018 Paul Boddie <paul@boddie.org.uk>
paul@113	7
paul@113	8	This program is free software; you can redistribute it and/or modify it under
paul@113	9	the terms of the GNU General Public License as published by the Free Software
paul@113	10	Foundation; either version 3 of the License, or (at your option) any later
paul@113	11	version.
paul@113	12
paul@113	13	This program is distributed in the hope that it will be useful, but WITHOUT
paul@113	14	ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
paul@113	15	FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
paul@113	16	details.
paul@113	17
paul@113	18	You should have received a copy of the GNU General Public License along with
paul@113	19	this program. If not, see <http://www.gnu.org/licenses/>.
paul@113	20	"""
paul@113	21
paul@791	22	from common import AccessLocation, CommonModule, CommonOutput, Location, \
paul@609	23	first, get_builtin_class, init_item, is_newer, \
paul@609	24	predefined_constants
paul@618	25	from encoders import encode_access_instruction, encode_access_instruction_arg, \
paul@636	26	encode_function_pointer, encode_literal_instantiator, \
paul@636	27	encode_instantiator_pointer, encode_path, encode_symbol, \
paul@828	28	encode_type_attribute, is_type_attribute, \
paul@828	29	type_ops, typename_ops
paul@545	30	from errors import InspectError, TranslateError
paul@113	31	from os.path import exists, join
paul@113	32	from os import makedirs
paul@749	33	from referencing import Reference, combine_types
paul@636	34	from results import Result
paul@636	35	from transresults import TrConstantValueRef, TrInstanceRef, \
paul@636	36	TrLiteralSequenceRef, TrResolvedNameRef, \
paul@685	37	AliasResult, AttrResult, Expression, InstantiationResult, \
paul@636	38	InvocationResult, LogicalOperationResult, \
paul@636	39	LogicalResult, NegationResult, PredefinedConstantRef, \
paul@636	40	ReturnRef
paul@482	41	from StringIO import StringIO
paul@113	42	import compiler
paul@556	43	import sys
paul@113	44
paul@113	45	class Translator(CommonOutput):
paul@113	46
paul@113	47	"A program translator."
paul@113	48
paul@113	49	def __init__(self, importer, deducer, optimiser, output):
paul@113	50	self.importer = importer
paul@113	51	self.deducer = deducer
paul@113	52	self.optimiser = optimiser
paul@113	53	self.output = output
paul@113	54
paul@633	55	def to_output(self, reset=False, debug=False, gc_sections=False):
paul@609	56
paul@609	57	"Write a program to the configured output directory."
paul@609	58
paul@609	59	# Make a directory for the final sources.
paul@609	60
paul@113	61	output = join(self.output, "src")
paul@113	62
paul@113	63	if not exists(output):
paul@113	64	makedirs(output)
paul@113	65
paul@609	66	# Clean the output directory of irrelevant data.
paul@609	67
paul@617	68	self.check_output("debug=%r gc_sections=%r" % (debug, gc_sections))
paul@113	69
paul@113	70	for module in self.importer.modules.values():
paul@609	71	output_filename = join(output, "%s.c" % module.name)
paul@609	72
paul@609	73	# Do not generate modules in the native package. They are provided
paul@609	74	# by native functionality source files.
paul@609	75
paul@354	76	parts = module.name.split(".")
paul@609	77
paul@633	78	if parts[0] != "native" and \
paul@633	79	(reset or is_newer(module.filename, output_filename)):
paul@633	80
paul@161	81	tm = TranslatedModule(module.name, self.importer, self.deducer, self.optimiser)
paul@609	82	tm.translate(module.filename, output_filename)
paul@113	83
paul@636	84
paul@629	85
paul@113	86	def make_expression(expr):
paul@113	87
paul@113	88	"Make a new expression from the existing 'expr'."
paul@113	89
paul@636	90	if isinstance(expr, Result):
paul@113	91	return expr
paul@113	92	else:
paul@113	93	return Expression(str(expr))
paul@113	94
paul@552	95
paul@552	96
paul@113	97	# The actual translation process itself.
paul@113	98
paul@113	99	class TranslatedModule(CommonModule):
paul@113	100
paul@113	101	"A module translator."
paul@113	102
paul@113	103	def __init__(self, name, importer, deducer, optimiser):
paul@113	104	CommonModule.__init__(self, name, importer)
paul@113	105	self.deducer = deducer
paul@113	106	self.optimiser = optimiser
paul@113	107
paul@113	108	# Output stream.
paul@113	109
paul@482	110	self.out_toplevel = self.out = None
paul@113	111	self.indent = 0
paul@113	112	self.tabstop = " "
paul@113	113
paul@113	114	# Recorded namespaces.
paul@113	115
paul@113	116	self.namespaces = []
paul@113	117	self.in_conditional = False
paul@858	118	self.in_parameter_list = False
paul@113	119
paul@144	120	# Exception raising adjustments.
paul@144	121
paul@144	122	self.in_try_finally = False
paul@189	123	self.in_try_except = False
paul@144	124
paul@237	125	# Attribute access and accessor counting.
paul@113	126
paul@113	127	self.attr_accesses = {}
paul@237	128	self.attr_accessors = {}
paul@113	129
paul@482	130	# Special variable usage.
paul@482	131
paul@482	132	self.temp_usage = {}
paul@482	133
paul@593	134	# Initialise some data used for attribute access generation.
paul@593	135
paul@593	136	self.init_substitutions()
paul@593	137
paul@113	138	def __repr__(self):
paul@113	139	return "TranslatedModule(%r, %r)" % (self.name, self.importer)
paul@113	140
paul@113	141	def translate(self, filename, output_filename):
paul@113	142
paul@113	143	"""
paul@113	144	Parse the file having the given 'filename', writing the translation to
paul@113	145	the given 'output_filename'.
paul@113	146	"""
paul@113	147
paul@113	148	self.parse_file(filename)
paul@113	149
paul@113	150	# Collect function namespaces for separate processing.
paul@113	151
paul@113	152	self.record_namespaces(self.astnode)
paul@113	153
paul@113	154	# Reset the lambda naming (in order to obtain the same names again) and
paul@113	155	# translate the program.
paul@113	156
paul@113	157	self.reset_lambdas()
paul@113	158
paul@482	159	self.out_toplevel = self.out = open(output_filename, "w")
paul@113	160	try:
paul@128	161	self.start_output()
paul@128	162
paul@113	163	# Process namespaces, writing the translation.
paul@113	164
paul@113	165	for path, node in self.namespaces:
paul@113	166	self.process_namespace(path, node)
paul@113	167
paul@113	168	# Process the module namespace including class namespaces.
paul@113	169
paul@113	170	self.process_namespace([], self.astnode)
paul@113	171
paul@113	172	finally:
paul@113	173	self.out.close()
paul@113	174
paul@113	175	def have_object(self):
paul@113	176
paul@113	177	"Return whether a namespace is a recorded object."
paul@113	178
paul@113	179	return self.importer.objects.get(self.get_namespace_path())
paul@113	180
paul@156	181	def get_builtin_class(self, name):
paul@156	182
paul@156	183	"Return a reference to the actual object providing 'name'."
paul@156	184
paul@538	185	return self.importer.get_object(get_builtin_class(name))
paul@156	186
paul@156	187	def is_method(self, path):
paul@156	188
paul@156	189	"Return whether 'path' is a method."
paul@156	190
paul@113	191	class_name, method_name = path.rsplit(".", 1)
paul@267	192	return self.importer.classes.has_key(class_name) and class_name or None
paul@113	193
paul@208	194	def in_method(self):
paul@208	195
paul@208	196	"Return whether the current namespace provides a method."
paul@208	197
paul@208	198	return self.in_function and self.is_method(self.get_namespace_path())
paul@208	199
paul@113	200	# Namespace recording.
paul@113	201
paul@113	202	def record_namespaces(self, node):
paul@113	203
paul@113	204	"Process the program structure 'node', recording namespaces."
paul@113	205
paul@113	206	for n in node.getChildNodes():
paul@113	207	self.record_namespaces_in_node(n)
paul@113	208
paul@113	209	def record_namespaces_in_node(self, node):
paul@113	210
paul@113	211	"Process the program structure 'node', recording namespaces."
paul@113	212
paul@113	213	# Function namespaces within modules, classes and other functions.
paul@113	214	# Functions appearing within conditional statements are given arbitrary
paul@113	215	# names.
paul@113	216
paul@113	217	if isinstance(node, compiler.ast.Function):
paul@113	218	self.record_function_node(node, (self.in_conditional or self.in_function) and self.get_lambda_name() or node.name)
paul@113	219
paul@113	220	elif isinstance(node, compiler.ast.Lambda):
paul@113	221	self.record_function_node(node, self.get_lambda_name())
paul@113	222
paul@113	223	# Classes are visited, but may be ignored if inside functions.
paul@113	224
paul@113	225	elif isinstance(node, compiler.ast.Class):
paul@113	226	self.enter_namespace(node.name)
paul@113	227	if self.have_object():
paul@113	228	self.record_namespaces(node)
paul@113	229	self.exit_namespace()
paul@113	230
paul@113	231	# Conditional nodes are tracked so that function definitions may be
paul@113	232	# handled. Since "for" loops are converted to "while" loops, they are
paul@113	233	# included here.
paul@113	234
paul@113	235	elif isinstance(node, (compiler.ast.For, compiler.ast.If, compiler.ast.While)):
paul@113	236	in_conditional = self.in_conditional
paul@113	237	self.in_conditional = True
paul@113	238	self.record_namespaces(node)
paul@113	239	self.in_conditional = in_conditional
paul@113	240
paul@113	241	# All other nodes are processed depth-first.
paul@113	242
paul@113	243	else:
paul@113	244	self.record_namespaces(node)
paul@113	245
paul@113	246	def record_function_node(self, n, name):
paul@113	247
paul@113	248	"""
paul@113	249	Record the given function, lambda, if expression or list comprehension
paul@113	250	node 'n' with the given 'name'.
paul@113	251	"""
paul@113	252
paul@113	253	self.in_function = True
paul@113	254	self.enter_namespace(name)
paul@113	255
paul@113	256	if self.have_object():
paul@113	257
paul@113	258	# Record the namespace path and the node itself.
paul@113	259
paul@113	260	self.namespaces.append((self.namespace_path[:], n))
paul@113	261	self.record_namespaces_in_node(n.code)
paul@113	262
paul@113	263	self.exit_namespace()
paul@113	264	self.in_function = False
paul@113	265
paul@113	266	# Constant referencing.
paul@113	267
paul@405	268	def get_literal_instance(self, n, name=None):
paul@113	269
paul@113	270	"""
paul@405	271	For node 'n', return a reference for the type of the given 'name', or if
paul@405	272	'name' is not specified, deduce the type from the value.
paul@113	273	"""
paul@113	274
paul@366	275	# Handle stray None constants (Sliceobj seems to produce them).
paul@366	276
paul@405	277	if name is None and n.value is None:
paul@366	278	return self.process_name_node(compiler.ast.Name("None"))
paul@366	279
paul@113	280	if name in ("dict", "list", "tuple"):
paul@405	281	ref = self.get_builtin_class(name)
paul@113	282	return self.process_literal_sequence_node(n, name, ref, TrLiteralSequenceRef)
paul@113	283	else:
paul@537	284	value, typename, encoding = self.get_constant_value(n.value, n.literals)
paul@538	285	ref = self.get_builtin_class(typename)
paul@397	286	value_type = ref.get_origin()
paul@397	287
paul@113	288	path = self.get_namespace_path()
paul@406	289
paul@406	290	# Obtain the local numbering of the constant and thus the
paul@406	291	# locally-qualified name.
paul@406	292
paul@406	293	local_number = self.importer.all_constants[path][(value, value_type, encoding)]
paul@113	294	constant_name = "$c%d" % local_number
paul@113	295	objpath = self.get_object_path(constant_name)
paul@406	296
paul@406	297	# Obtain the unique identifier for the constant.
paul@406	298
paul@113	299	number = self.optimiser.constant_numbers[objpath]
paul@394	300	return TrConstantValueRef(constant_name, ref.instance_of(), value, number)
paul@113	301
paul@113	302	# Namespace translation.
paul@113	303
paul@113	304	def process_namespace(self, path, node):
paul@113	305
paul@113	306	"""
paul@113	307	Process the namespace for the given 'path' defined by the given 'node'.
paul@113	308	"""
paul@113	309
paul@113	310	self.namespace_path = path
paul@113	311
paul@113	312	if isinstance(node, (compiler.ast.Function, compiler.ast.Lambda)):
paul@113	313	self.in_function = True
paul@113	314	self.process_function_body_node(node)
paul@113	315	else:
paul@113	316	self.in_function = False
paul@192	317	self.function_target = 0
paul@828	318	self.max_function_target = 0
paul@828	319	self.context_index = 0
paul@828	320	self.max_context_index = 0
paul@858	321	self.accessor_index = 0
paul@858	322	self.max_accessor_index = 0
paul@113	323	self.start_module()
paul@113	324	self.process_structure(node)
paul@113	325	self.end_module()
paul@113	326
paul@113	327	def process_structure(self, node):
paul@113	328
paul@113	329	"Process the given 'node' or result."
paul@113	330
paul@144	331	# Handle processing requests on results.
paul@144	332
paul@636	333	if isinstance(node, Result):
paul@113	334	return node
paul@144	335
paul@144	336	# Handle processing requests on nodes.
paul@144	337
paul@113	338	else:
paul@144	339	l = CommonModule.process_structure(self, node)
paul@144	340
paul@144	341	# Return indications of return statement usage.
paul@144	342
paul@144	343	if l and isinstance(l[-1], ReturnRef):
paul@144	344	return l[-1]
paul@144	345	else:
paul@144	346	return None
paul@113	347
paul@113	348	def process_structure_node(self, n):
paul@113	349
paul@113	350	"Process the individual node 'n'."
paul@113	351
paul@113	352	# Plain statements emit their expressions.
paul@113	353
paul@113	354	if isinstance(n, compiler.ast.Discard):
paul@113	355	expr = self.process_structure_node(n.expr)
paul@113	356	self.statement(expr)
paul@113	357
paul@314	358	# Module import declarations.
paul@314	359
paul@314	360	elif isinstance(n, compiler.ast.From):
paul@314	361	self.process_from_node(n)
paul@314	362
paul@113	363	# Nodes using operator module functions.
paul@113	364
paul@113	365	elif isinstance(n, compiler.ast.Operator):
paul@113	366	return self.process_operator_node(n)
paul@113	367
paul@113	368	elif isinstance(n, compiler.ast.AugAssign):
paul@113	369	self.process_augassign_node(n)
paul@113	370
paul@113	371	elif isinstance(n, compiler.ast.Compare):
paul@113	372	return self.process_compare_node(n)
paul@113	373
paul@113	374	elif isinstance(n, compiler.ast.Slice):
paul@113	375	return self.process_slice_node(n)
paul@113	376
paul@113	377	elif isinstance(n, compiler.ast.Sliceobj):
paul@113	378	return self.process_sliceobj_node(n)
paul@113	379
paul@113	380	elif isinstance(n, compiler.ast.Subscript):
paul@113	381	return self.process_subscript_node(n)
paul@113	382
paul@113	383	# Classes are visited, but may be ignored if inside functions.
paul@113	384
paul@113	385	elif isinstance(n, compiler.ast.Class):
paul@113	386	self.process_class_node(n)
paul@113	387
paul@113	388	# Functions within namespaces have any dynamic defaults initialised.
paul@113	389
paul@113	390	elif isinstance(n, compiler.ast.Function):
paul@113	391	self.process_function_node(n)
paul@113	392
paul@113	393	# Lambdas are replaced with references to separately-generated
paul@113	394	# functions.
paul@113	395
paul@113	396	elif isinstance(n, compiler.ast.Lambda):
paul@113	397	return self.process_lambda_node(n)
paul@113	398
paul@113	399	# Assignments.
paul@113	400
paul@113	401	elif isinstance(n, compiler.ast.Assign):
paul@113	402
paul@113	403	# Handle each assignment node.
paul@113	404
paul@113	405	for node in n.nodes:
paul@113	406	self.process_assignment_node(node, n.expr)
paul@113	407
paul@113	408	# Accesses.
paul@113	409
paul@113	410	elif isinstance(n, compiler.ast.Getattr):
paul@113	411	return self.process_attribute_access(n)
paul@113	412
paul@113	413	# Names.
paul@113	414
paul@113	415	elif isinstance(n, compiler.ast.Name):
paul@113	416	return self.process_name_node(n)
paul@113	417
paul@113	418	# Loops and conditionals.
paul@113	419
paul@113	420	elif isinstance(n, compiler.ast.For):
paul@113	421	self.process_for_node(n)
paul@113	422
paul@113	423	elif isinstance(n, compiler.ast.While):
paul@113	424	self.process_while_node(n)
paul@113	425
paul@113	426	elif isinstance(n, compiler.ast.If):
paul@113	427	self.process_if_node(n)
paul@113	428
paul@113	429	elif isinstance(n, (compiler.ast.And, compiler.ast.Or)):
paul@113	430	return self.process_logical_node(n)
paul@113	431
paul@113	432	elif isinstance(n, compiler.ast.Not):
paul@113	433	return self.process_not_node(n)
paul@113	434
paul@113	435	# Exception control-flow tracking.
paul@113	436
paul@113	437	elif isinstance(n, compiler.ast.TryExcept):
paul@113	438	self.process_try_node(n)
paul@113	439
paul@113	440	elif isinstance(n, compiler.ast.TryFinally):
paul@113	441	self.process_try_finally_node(n)
paul@113	442
paul@113	443	# Control-flow modification statements.
paul@113	444
paul@113	445	elif isinstance(n, compiler.ast.Break):
paul@128	446	self.writestmt("break;")
paul@113	447
paul@113	448	elif isinstance(n, compiler.ast.Continue):
paul@128	449	self.writestmt("continue;")
paul@113	450
paul@144	451	elif isinstance(n, compiler.ast.Raise):
paul@144	452	self.process_raise_node(n)
paul@144	453
paul@113	454	elif isinstance(n, compiler.ast.Return):
paul@144	455	return self.process_return_node(n)
paul@113	456
paul@173	457	# Print statements.
paul@173	458
paul@173	459	elif isinstance(n, (compiler.ast.Print, compiler.ast.Printnl)):
paul@173	460	self.statement(self.process_print_node(n))
paul@173	461
paul@113	462	# Invocations.
paul@113	463
paul@113	464	elif isinstance(n, compiler.ast.CallFunc):
paul@113	465	return self.process_invocation_node(n)
paul@113	466
paul@113	467	elif isinstance(n, compiler.ast.Keyword):
paul@113	468	return self.process_structure_node(n.expr)
paul@113	469
paul@113	470	# Constant usage.
paul@113	471
paul@113	472	elif isinstance(n, compiler.ast.Const):
paul@405	473	return self.get_literal_instance(n)
paul@113	474
paul@113	475	elif isinstance(n, compiler.ast.Dict):
paul@113	476	return self.get_literal_instance(n, "dict")
paul@113	477
paul@113	478	elif isinstance(n, compiler.ast.List):
paul@113	479	return self.get_literal_instance(n, "list")
paul@113	480
paul@113	481	elif isinstance(n, compiler.ast.Tuple):
paul@113	482	return self.get_literal_instance(n, "tuple")
paul@113	483
paul@113	484	# All other nodes are processed depth-first.
paul@113	485
paul@113	486	else:
paul@144	487	return self.process_structure(n)
paul@113	488
paul@113	489	def process_assignment_node(self, n, expr):
paul@113	490
paul@113	491	"Process the individual node 'n' to be assigned the contents of 'expr'."
paul@113	492
paul@113	493	# Names and attributes are assigned the entire expression.
paul@113	494
paul@113	495	if isinstance(n, compiler.ast.AssName):
paul@113	496	name_ref = self.process_name_node(n, self.process_structure_node(expr))
paul@113	497	self.statement(name_ref)
paul@113	498
paul@238	499	# Employ guards after assignments if required.
paul@238	500
paul@238	501	if expr and name_ref.is_name():
paul@238	502	self.generate_guard(name_ref.name)
paul@238	503
paul@113	504	elif isinstance(n, compiler.ast.AssAttr):
paul@124	505	in_assignment = self.in_assignment
paul@124	506	self.in_assignment = self.process_structure_node(expr)
paul@124	507	self.statement(self.process_attribute_access(n))
paul@124	508	self.in_assignment = in_assignment
paul@113	509
paul@113	510	# Lists and tuples are matched against the expression and their
paul@113	511	# items assigned to expression items.
paul@113	512
paul@113	513	elif isinstance(n, (compiler.ast.AssList, compiler.ast.AssTuple)):
paul@113	514	self.process_assignment_node_items(n, expr)
paul@113	515
paul@113	516	# Slices and subscripts are permitted within assignment nodes.
paul@113	517
paul@113	518	elif isinstance(n, compiler.ast.Slice):
paul@113	519	self.statement(self.process_slice_node(n, expr))
paul@113	520
paul@113	521	elif isinstance(n, compiler.ast.Subscript):
paul@113	522	self.statement(self.process_subscript_node(n, expr))
paul@113	523
paul@124	524	def process_attribute_access(self, n):
paul@113	525
paul@368	526	"Process the given attribute access node 'n'."
paul@113	527
paul@113	528	# Obtain any completed chain and return the reference to it.
paul@113	529
paul@113	530	attr_expr = self.process_attribute_chain(n)
paul@113	531	if self.have_access_expression(n):
paul@113	532	return attr_expr
paul@113	533
paul@113	534	# Where the start of the chain of attributes has been reached, process
paul@113	535	# the complete access.
paul@113	536
paul@113	537	name_ref = attr_expr and attr_expr.is_name() and attr_expr
paul@603	538	name = name_ref and self.get_name_for_tracking(name_ref.name, name_ref) or None
paul@113	539
paul@553	540	location = self.get_access_location(name, self.attrs)
paul@113	541	refs = self.get_referenced_attributes(location)
paul@113	542
paul@113	543	# Generate access instructions.
paul@113	544
paul@113	545	subs = {
paul@491	546	"<expr>" : attr_expr,
paul@757	547	"<name>" : attr_expr,
paul@491	548	"<assexpr>" : self.in_assignment,
paul@482	549	}
paul@482	550
paul@593	551	subs.update(self.temp_subs)
paul@593	552	subs.update(self.op_subs)
paul@482	553
paul@113	554	output = []
paul@482	555	substituted = set()
paul@482	556
paul@591	557	# The context set or retrieved will be that used by any enclosing
paul@591	558	# invocation.
paul@591	559
paul@858	560	accessor_index = self.accessor_index
paul@828	561	context_index = self.context_index
paul@618	562	context_identity = None
paul@776	563	context_identity_verified = False
paul@752	564	final_identity = None
paul@828	565	accessor_test = False
paul@858	566	accessor_stored = False
paul@591	567
paul@482	568	# Obtain encoded versions of each instruction, accumulating temporary
paul@482	569	# variables.
paul@113	570
paul@653	571	for instruction in self.deducer.access_instructions[location]:
paul@618	572
paul@618	573	# Intercept a special instruction identifying the context.
paul@618	574
paul@776	575	if instruction[0] in ("<context_identity>", "<context_identity_verified>"):
paul@858	576	context_identity, _substituted = \
paul@858	577	encode_access_instruction_arg(instruction[1], subs, instruction[0],
paul@858	578	accessor_index, context_index)
paul@776	579	context_identity_verified = instruction[0] == "<context_identity_verified>"
paul@618	580	continue
paul@618	581
paul@752	582	# Intercept a special instruction identifying the target. The value
paul@752	583	# is not encoded since it is used internally.
paul@752	584
paul@776	585	elif instruction[0] == "<final_identity>":
paul@752	586	final_identity = instruction[1]
paul@752	587	continue
paul@752	588
paul@828	589	# Modify test instructions.
paul@828	590
paul@828	591	elif instruction[0] in typename_ops or instruction[0] in type_ops:
paul@828	592	instruction = ("__to_error", instruction)
paul@828	593	accessor_test = True
paul@828	594
paul@858	595	# Intercept accessor storage.
paul@858	596
paul@858	597	elif instruction[0] == "<set_accessor>":
paul@858	598	accessor_stored = True
paul@858	599
paul@618	600	# Collect the encoded instruction, noting any temporary variables
paul@618	601	# required by it.
paul@618	602
paul@858	603	encoded, _substituted = encode_access_instruction(instruction, subs,
paul@858	604	accessor_index, context_index)
paul@482	605	output.append(encoded)
paul@482	606	substituted.update(_substituted)
paul@482	607
paul@482	608	# Record temporary name usage.
paul@482	609
paul@482	610	for sub in substituted:
paul@593	611	if self.temp_subs.has_key(sub):
paul@593	612	self.record_temp(self.temp_subs[sub])
paul@482	613
paul@752	614	# Get full final identity details.
paul@752	615
paul@752	616	if final_identity and not refs:
paul@843	617	refs = set([self.importer.identify(final_identity)])
paul@752	618
paul@113	619	del self.attrs[0]
paul@858	620	return AttrResult(output, refs, location,
paul@858	621	context_identity, context_identity_verified,
paul@858	622	accessor_test, accessor_stored)
paul@113	623
paul@593	624	def init_substitutions(self):
paul@593	625
paul@593	626	"""
paul@593	627	Initialise substitutions, defining temporary variable mappings, some of
paul@593	628	which are also used as substitutions, together with operation mappings
paul@593	629	used as substitutions in instructions defined by the optimiser.
paul@593	630	"""
paul@593	631
paul@593	632	self.temp_subs = {
paul@593	633
paul@593	634	# Substitutions used by instructions.
paul@593	635
paul@593	636	"<private_context>" : "__tmp_private_context",
paul@593	637	"<target_accessor>" : "__tmp_target_value",
paul@593	638
paul@593	639	# Mappings to be replaced by those given below.
paul@593	640
paul@858	641	"<accessor>" : "__tmp_values",
paul@593	642	"<context>" : "__tmp_contexts",
paul@601	643	"<test_context_revert>" : "__tmp_contexts",
paul@595	644	"<test_context_static>" : "__tmp_contexts",
paul@593	645	"<set_context>" : "__tmp_contexts",
paul@593	646	"<set_private_context>" : "__tmp_private_context",
paul@858	647	"<set_accessor>" : "__tmp_values",
paul@593	648	"<set_target_accessor>" : "__tmp_target_value",
paul@593	649	}
paul@593	650
paul@593	651	self.op_subs = {
paul@858	652	"<accessor>" : "__get_accessor",
paul@593	653	"<context>" : "__get_context",
paul@601	654	"<test_context_revert>" : "__test_context_revert",
paul@595	655	"<test_context_static>" : "__test_context_static",
paul@593	656	"<set_context>" : "__set_context",
paul@593	657	"<set_private_context>" : "__set_private_context",
paul@593	658	"<set_accessor>" : "__set_accessor",
paul@593	659	"<set_target_accessor>" : "__set_target_accessor",
paul@593	660	}
paul@593	661
paul@113	662	def get_referenced_attributes(self, location):
paul@113	663
paul@113	664	"""
paul@113	665	Convert 'location' to the form used by the deducer and retrieve any
paul@553	666	identified attributes.
paul@113	667	"""
paul@113	668
paul@747	669	# Determine whether any deduced references refer to the accessed
paul@747	670	# attribute.
paul@747	671
paul@791	672	attrnames = location.attrnames
paul@747	673	attrnames = attrnames and attrnames.split(".")
paul@747	674	remaining = attrnames and len(attrnames) > 1
paul@747	675
paul@751	676	access_location = self.deducer.const_accesses.get(location)
paul@751	677
paul@747	678	if remaining and not access_location:
paul@843	679	return set()
paul@843	680
paul@843	681	return self.deducer.get_references_for_access(access_location or location)
paul@113	682
paul@553	683	def get_referenced_attribute_invocations(self, location):
paul@553	684
paul@553	685	"""
paul@553	686	Convert 'location' to the form used by the deducer and retrieve any
paul@553	687	identified attribute invocation details.
paul@553	688	"""
paul@553	689
paul@553	690	access_location = self.deducer.const_accesses.get(location)
paul@553	691	return self.deducer.reference_invocations_unsuitable.get(access_location or location)
paul@553	692
paul@736	693	def get_accessor_kinds(self, location):
paul@736	694
paul@736	695	"Return the accessor kinds for 'location'."
paul@736	696
paul@736	697	return self.deducer.accessor_kinds.get(location)
paul@234	698
paul@553	699	def get_access_location(self, name, attrnames=None):
paul@113	700
paul@113	701	"""
paul@553	702	Using the current namespace, the given 'name', and the 'attrnames'
paul@553	703	employed in an access, return the access location.
paul@113	704	"""
paul@113	705
paul@113	706	path = self.get_path_for_access()
paul@113	707
paul@113	708	# Get the location used by the deducer and optimiser and find any
paul@113	709	# recorded access.
paul@113	710
paul@553	711	attrnames = attrnames and ".".join(self.attrs)
paul@113	712	access_number = self.get_access_number(path, name, attrnames)
paul@113	713	self.update_access_number(path, name, attrnames)
paul@791	714	return AccessLocation(path, name, attrnames, access_number)
paul@113	715
paul@113	716	def get_access_number(self, path, name, attrnames):
paul@113	717	access = name, attrnames
paul@113	718	if self.attr_accesses.has_key(path) and self.attr_accesses[path].has_key(access):
paul@113	719	return self.attr_accesses[path][access]
paul@113	720	else:
paul@113	721	return 0
paul@113	722
paul@113	723	def update_access_number(self, path, name, attrnames):
paul@113	724	access = name, attrnames
paul@113	725	if name:
paul@113	726	init_item(self.attr_accesses, path, dict)
paul@144	727	init_item(self.attr_accesses[path], access, lambda: 0)
paul@144	728	self.attr_accesses[path][access] += 1
paul@113	729
paul@237	730	def get_accessor_location(self, name):
paul@237	731
paul@237	732	"""
paul@237	733	Using the current namespace and the given 'name', return the accessor
paul@237	734	location.
paul@237	735	"""
paul@237	736
paul@237	737	path = self.get_path_for_access()
paul@237	738
paul@237	739	# Get the location used by the deducer and optimiser and find any
paul@237	740	# recorded accessor.
paul@237	741
paul@791	742	version = self.get_accessor_number(path, name)
paul@237	743	self.update_accessor_number(path, name)
paul@791	744	return Location(path, name, None, version)
paul@237	745
paul@237	746	def get_accessor_number(self, path, name):
paul@237	747	if self.attr_accessors.has_key(path) and self.attr_accessors[path].has_key(name):
paul@237	748	return self.attr_accessors[path][name]
paul@237	749	else:
paul@237	750	return 0
paul@237	751
paul@237	752	def update_accessor_number(self, path, name):
paul@237	753	if name:
paul@237	754	init_item(self.attr_accessors, path, dict)
paul@237	755	init_item(self.attr_accessors[path], name, lambda: 0)
paul@237	756	self.attr_accessors[path][name] += 1
paul@237	757
paul@113	758	def process_class_node(self, n):
paul@113	759
paul@113	760	"Process the given class node 'n'."
paul@113	761
paul@320	762	class_name = self.get_object_path(n.name)
paul@320	763
paul@320	764	# Where a class is set conditionally or where the name may refer to
paul@320	765	# different values, assign the name.
paul@320	766
paul@320	767	ref = self.importer.identify(class_name)
paul@320	768
paul@320	769	if not ref.static():
paul@626	770	self.process_assignment_for_object(n.name,
paul@626	771	make_expression("__ATTRVALUE(&%s)" % encode_path(class_name)))
paul@320	772
paul@113	773	self.enter_namespace(n.name)
paul@113	774
paul@113	775	if self.have_object():
paul@113	776	self.write_comment("Class: %s" % class_name)
paul@113	777
paul@257	778	self.initialise_inherited_members(class_name)
paul@257	779
paul@113	780	self.process_structure(n)
paul@257	781	self.write_comment("End class: %s" % class_name)
paul@113	782
paul@113	783	self.exit_namespace()
paul@113	784
paul@257	785	def initialise_inherited_members(self, class_name):
paul@257	786
paul@257	787	"Initialise members of 'class_name' inherited from its ancestors."
paul@257	788
paul@257	789	for name, path in self.importer.all_class_attrs[class_name].items():
paul@257	790	target = "%s.%s" % (class_name, name)
paul@257	791
paul@257	792	# Ignore attributes with definitions.
paul@257	793
paul@257	794	ref = self.importer.identify(target)
paul@257	795	if ref:
paul@257	796	continue
paul@257	797
paul@320	798	# Ignore special type attributes.
paul@320	799
paul@320	800	if is_type_attribute(name):
paul@320	801	continue
paul@320	802
paul@257	803	# Reference inherited attributes.
paul@257	804
paul@257	805	ref = self.importer.identify(path)
paul@257	806	if ref and not ref.static():
paul@257	807	parent, attrname = path.rsplit(".", 1)
paul@257	808
paul@257	809	self.writestmt("__store_via_object(&%s, %s, __load_via_object(&%s, %s));" % (
paul@624	810	encode_path(class_name), name,
paul@624	811	encode_path(parent), attrname
paul@257	812	))
paul@257	813
paul@314	814	def process_from_node(self, n):
paul@314	815
paul@314	816	"Process the given node 'n', importing from another module."
paul@314	817
paul@314	818	path = self.get_namespace_path()
paul@314	819
paul@314	820	# Attempt to obtain the referenced objects.
paul@314	821
paul@314	822	for name, alias in n.names:
paul@314	823	if name == "*":
paul@314	824	raise InspectError("Only explicitly specified names can be imported from modules.", path, n)
paul@314	825
paul@314	826	# Obtain the path of the assigned name.
paul@314	827
paul@314	828	objpath = self.get_object_path(alias or name)
paul@314	829
paul@314	830	# Obtain the identity of the name.
paul@314	831
paul@314	832	ref = self.importer.identify(objpath)
paul@314	833
paul@314	834	# Where the name is not static, assign the value.
paul@314	835
paul@314	836	if ref and not ref.static() and ref.get_name():
paul@314	837	self.writestmt("%s;" %
paul@314	838	TrResolvedNameRef(alias or name, Reference("<var>", None, objpath),
paul@314	839	expr=TrResolvedNameRef(name, ref)))
paul@314	840
paul@113	841	def process_function_body_node(self, n):
paul@113	842
paul@113	843	"""
paul@113	844	Process the given function, lambda, if expression or list comprehension
paul@113	845	node 'n', generating the body.
paul@113	846	"""
paul@113	847
paul@113	848	function_name = self.get_namespace_path()
paul@113	849	self.start_function(function_name)
paul@113	850
paul@113	851	# Process the function body.
paul@113	852
paul@113	853	in_conditional = self.in_conditional
paul@113	854	self.in_conditional = False
paul@192	855	self.function_target = 0
paul@828	856	self.max_function_target = 0
paul@828	857	self.context_index = 0
paul@828	858	self.max_context_index = 0
paul@858	859	self.accessor_index = 0
paul@858	860	self.max_accessor_index = 0
paul@113	861
paul@670	862	# Volatile locals for exception handling.
paul@670	863
paul@670	864	self.volatile_locals = set()
paul@670	865
paul@237	866	# Process any guards defined for the parameters.
paul@237	867
paul@237	868	for name in self.importer.function_parameters.get(function_name):
paul@238	869	self.generate_guard(name)
paul@237	870
paul@816	871	# Also support self in methods, since some mix-in methods may only work
paul@816	872	# with certain descendant classes.
paul@816	873
paul@816	874	if self.in_method():
paul@816	875	self.generate_guard("self")
paul@816	876
paul@819	877	# Make assignments for .name entries in the parameters, provided this is
paul@819	878	# a method.
paul@819	879
paul@819	880	if self.in_method():
paul@819	881	for name in self.importer.function_attr_initialisers.get(function_name) or []:
paul@819	882	self.process_assignment_node(
paul@819	883	compiler.ast.AssAttr(compiler.ast.Name("self"), name, "OP_ASSIGN"),
paul@819	884	compiler.ast.Name(name))
paul@819	885
paul@237	886	# Produce the body and any additional return statement.
paul@237	887
paul@986	888	expr = self.process_statement_node(n.code) or \
paul@669	889	self.in_method() and \
paul@669	890	function_name.rsplit(".", 1)[-1] == "__init__" and \
paul@669	891	TrResolvedNameRef("self", self.importer.function_locals[function_name]["self"]) or \
paul@669	892	PredefinedConstantRef("None")
paul@669	893
paul@144	894	if not isinstance(expr, ReturnRef):
paul@128	895	self.writestmt("return %s;" % expr)
paul@113	896
paul@113	897	self.in_conditional = in_conditional
paul@113	898
paul@144	899	self.end_function(function_name)
paul@113	900
paul@238	901	def generate_guard(self, name):
paul@238	902
paul@238	903	"""
paul@238	904	Get the accessor details for 'name', found in the current namespace, and
paul@238	905	generate any guards defined for it.
paul@238	906	"""
paul@238	907
paul@238	908	# Obtain the location, keeping track of assignment versions.
paul@238	909
paul@238	910	location = self.get_accessor_location(name)
paul@238	911	test = self.deducer.accessor_guard_tests.get(location)
paul@238	912
paul@238	913	# Generate any guard from the deduced information.
paul@238	914
paul@238	915	if test:
paul@238	916	guard, guard_type = test
paul@238	917
paul@238	918	if guard == "specific":
paul@238	919	ref = first(self.deducer.accessor_all_types[location])
paul@238	920	argstr = "&%s" % encode_path(ref.get_origin())
paul@238	921	elif guard == "common":
paul@238	922	ref = first(self.deducer.accessor_all_general_types[location])
paul@624	923	argstr = encode_path(encode_type_attribute(ref.get_origin()))
paul@238	924	else:
paul@238	925	return
paul@238	926
paul@238	927	# Write a test that raises a TypeError upon failure.
paul@238	928
paul@757	929	self.writestmt("if (!__test_%s_%s(__VALUE(%s), %s)) __raise_type_error();" % (
paul@763	930	guard, guard_type, encode_path(name), argstr))
paul@238	931
paul@113	932	def process_function_node(self, n):
paul@113	933
paul@113	934	"""
paul@113	935	Process the given function, lambda, if expression or list comprehension
paul@113	936	node 'n', generating any initialisation statements.
paul@113	937	"""
paul@113	938
paul@113	939	# Where a function is declared conditionally, use a separate name for
paul@113	940	# the definition, and assign the definition to the stated name.
paul@113	941
paul@196	942	original_name = n.name
paul@196	943
paul@113	944	if self.in_conditional or self.in_function:
paul@113	945	name = self.get_lambda_name()
paul@113	946	else:
paul@113	947	name = n.name
paul@113	948
paul@196	949	objpath = self.get_object_path(name)
paul@196	950
paul@113	951	# Obtain details of the defaults.
paul@113	952
paul@285	953	defaults = self.process_function_defaults(n, name, objpath)
paul@113	954	if defaults:
paul@113	955	for default in defaults:
paul@113	956	self.writeline("%s;" % default)
paul@113	957
paul@196	958	# Where a function is set conditionally or where the name may refer to
paul@196	959	# different values, assign the name.
paul@196	960
paul@196	961	ref = self.importer.identify(objpath)
paul@113	962
paul@196	963	if self.in_conditional or self.in_function:
paul@320	964	self.process_assignment_for_object(original_name, compiler.ast.Name(name))
paul@196	965	elif not ref.static():
paul@267	966	context = self.is_method(objpath)
paul@267	967
paul@320	968	self.process_assignment_for_object(original_name,
paul@626	969	make_expression("__ATTRVALUE(&%s)" % encode_path(objpath)))
paul@113	970
paul@285	971	def process_function_defaults(self, n, name, objpath, instance_name=None):
paul@113	972
paul@113	973	"""
paul@113	974	Process the given function or lambda node 'n', initialising defaults
paul@113	975	that are dynamically set. The given 'name' indicates the name of the
paul@285	976	function. The given 'objpath' indicates the origin of the function.
paul@285	977	The given 'instance_name' indicates the name of any separate instance
paul@285	978	of the function created to hold the defaults.
paul@113	979
paul@113	980	Return a list of operations setting defaults on a function instance.
paul@113	981	"""
paul@113	982
paul@113	983	function_name = self.get_object_path(name)
paul@113	984	function_defaults = self.importer.function_defaults.get(function_name)
paul@113	985	if not function_defaults:
paul@113	986	return None
paul@113	987
paul@113	988	# Determine whether any unidentified defaults are involved.
paul@113	989
paul@285	990	for argname, default in function_defaults:
paul@285	991	if not default.static():
paul@285	992	break
paul@285	993	else:
paul@113	994	return None
paul@113	995
paul@285	996	# Handle bound methods.
paul@285	997
paul@285	998	if not instance_name:
paul@523	999	instance_name = "&%s" % encode_path(objpath)
paul@757	1000	else:
paul@757	1001	instance_name = "__VALUE(%s)" % instance_name
paul@285	1002
paul@113	1003	# Where defaults are involved but cannot be identified, obtain a new
paul@113	1004	# instance of the lambda and populate the defaults.
paul@113	1005
paul@113	1006	defaults = []
paul@113	1007
paul@113	1008	# Join the original defaults with the inspected defaults.
paul@113	1009
paul@113	1010	original_defaults = [(argname, default) for (argname, default) in compiler.ast.get_defaults(n) if default]
paul@113	1011
paul@113	1012	for i, (original, inspected) in enumerate(map(None, original_defaults, function_defaults)):
paul@113	1013
paul@113	1014	# Obtain any reference for the default.
paul@113	1015
paul@113	1016	if original:
paul@113	1017	argname, default = original
paul@113	1018	name_ref = self.process_structure_node(default)
paul@113	1019	elif inspected:
paul@113	1020	argname, default = inspected
paul@113	1021	name_ref = TrResolvedNameRef(argname, default)
paul@113	1022	else:
paul@113	1023	continue
paul@113	1024
paul@338	1025	# Generate default initialisers except when constants are employed.
paul@338	1026	# Constants should be used when populating the function structures.
paul@338	1027
paul@338	1028	if name_ref and not isinstance(name_ref, TrConstantValueRef):
paul@285	1029	defaults.append("__SETDEFAULT(%s, %s, %s)" % (instance_name, i, name_ref))
paul@113	1030
paul@113	1031	return defaults
paul@113	1032
paul@113	1033	def process_if_node(self, n):
paul@113	1034
paul@113	1035	"""
paul@113	1036	Process the given "if" node 'n'.
paul@113	1037	"""
paul@113	1038
paul@113	1039	first = True
paul@113	1040	for test, body in n.tests:
paul@986	1041	test_ref = self.process_statement_node(test)
paul@113	1042	self.start_if(first, test_ref)
paul@113	1043
paul@113	1044	in_conditional = self.in_conditional
paul@113	1045	self.in_conditional = True
paul@986	1046	self.process_statement_node(body)
paul@113	1047	self.in_conditional = in_conditional
paul@113	1048
paul@113	1049	self.end_if()
paul@113	1050	first = False
paul@113	1051
paul@113	1052	if n.else_:
paul@113	1053	self.start_else()
paul@986	1054	self.process_statement_node(n.else_)
paul@113	1055	self.end_else()
paul@113	1056
paul@634	1057	print >>self.out
paul@634	1058
paul@113	1059	def process_invocation_node(self, n):
paul@113	1060
paul@113	1061	"Process the given invocation node 'n'."
paul@113	1062
paul@590	1063	# Process the expression.
paul@590	1064
paul@113	1065	expr = self.process_structure_node(n.node)
paul@590	1066
paul@590	1067	# Obtain details of the invocation expression.
paul@590	1068
paul@113	1069	objpath = expr.get_origin()
paul@554	1070	location = expr.access_location()
paul@745	1071	refs = expr.references()
paul@552	1072
paul@552	1073	# Identified target details.
paul@552	1074
paul@118	1075	target = None
paul@407	1076	target_structure = None
paul@552	1077
paul@552	1078	# Specific function target information.
paul@552	1079
paul@242	1080	function = None
paul@552	1081
paul@552	1082	# Instantiation involvement.
paul@552	1083
paul@317	1084	instantiation = False
paul@159	1085	literal_instantiation = False
paul@552	1086
paul@552	1087	# Invocation requirements.
paul@552	1088
paul@312	1089	context_required = True
paul@587	1090	have_access_context = isinstance(expr, AttrResult)
paul@852	1091
paul@852	1092	# The context identity is merely the thing providing the context.
paul@852	1093	# A verified context is one that does not need further testing for
paul@852	1094	# suitability.
paul@852	1095
paul@618	1096	context_identity = have_access_context and expr.context()
paul@776	1097	context_verified = have_access_context and expr.context_verified()
paul@852	1098
paul@852	1099	# The presence of any test operations in the accessor expression.
paul@852	1100	# With such operations present, the expression cannot be eliminated.
paul@852	1101
paul@828	1102	tests_accessor = have_access_context and expr.tests_accessor()
paul@858	1103	stores_accessor = have_access_context and expr.stores_accessor()
paul@852	1104
paul@852	1105	# Parameter details and parameter list dimensions.
paul@852	1106
paul@552	1107	parameters = None
paul@753	1108	num_parameters = None
paul@753	1109	num_defaults = None
paul@552	1110
paul@552	1111	# Obtain details of the callable and of its parameters.
paul@113	1112
paul@159	1113	# Literals may be instantiated specially.
paul@159	1114
paul@159	1115	if expr.is_name() and expr.name.startswith("$L") and objpath:
paul@317	1116	instantiation = literal_instantiation = objpath
paul@159	1117	target = encode_literal_instantiator(objpath)
paul@312	1118	context_required = False
paul@159	1119
paul@159	1120	# Identified targets employ function pointers directly.
paul@159	1121
paul@159	1122	elif objpath:
paul@113	1123	parameters = self.importer.function_parameters.get(objpath)
paul@749	1124	function_defaults = self.importer.function_defaults.get(objpath)
paul@753	1125	num_parameters = parameters and len(parameters) or 0
paul@753	1126	num_defaults = function_defaults and len(function_defaults) or 0
paul@234	1127
paul@234	1128	# Class invocation involves instantiators.
paul@234	1129
paul@118	1130	if expr.has_kind("<class>"):
paul@317	1131	instantiation = objpath
paul@118	1132	target = encode_instantiator_pointer(objpath)
paul@540	1133	init_ref = self.importer.all_class_attrs[objpath]["__init__"]
paul@540	1134	target_structure = "&%s" % encode_path(init_ref)
paul@312	1135	context_required = False
paul@234	1136
paul@234	1137	# Only plain functions and bound methods employ function pointers.
paul@234	1138
paul@118	1139	elif expr.has_kind("<function>"):
paul@242	1140	function = objpath
paul@234	1141
paul@234	1142	# Test for functions and methods.
paul@234	1143
paul@407	1144	context_required = self.is_method(objpath)
paul@685	1145
paul@736	1146	accessor_kinds = location and self.get_accessor_kinds(location)
paul@685	1147
paul@312	1148	instance_accessor = accessor_kinds and \
paul@312	1149	len(accessor_kinds) == 1 and \
paul@312	1150	first(accessor_kinds) == "<instance>"
paul@234	1151
paul@407	1152	# Only identify certain bound methods or functions.
paul@407	1153
paul@407	1154	if not context_required or instance_accessor:
paul@234	1155	target = encode_function_pointer(objpath)
paul@407	1156
paul@407	1157	# Access bound method defaults even if it is not clear whether
paul@407	1158	# the accessor is appropriate.
paul@407	1159
paul@523	1160	target_structure = "&%s" % encode_path(objpath)
paul@312	1161
paul@749	1162	# Other targets are retrieved at run-time.
paul@749	1163
paul@749	1164	else:
paul@749	1165	if location:
paul@791	1166	attrnames = location.attrnames
paul@749	1167	attrname = attrnames and attrnames.rsplit(".", 1)[-1]
paul@749	1168
paul@830	1169	# Determine common aspects of any identifiable targets.
paul@830	1170
paul@830	1171	if attrname or refs:
paul@749	1172	all_params = set()
paul@749	1173	all_defaults = set()
paul@753	1174	min_params = set()
paul@753	1175	max_params = set()
paul@830	1176
paul@830	1177	# Employ references from the expression or find all
paul@830	1178	# possible attributes for the given attribute name.
paul@830	1179
paul@830	1180	refs = refs or self.get_attributes_for_attrname(attrname)
paul@749	1181
paul@749	1182	# Obtain parameters and defaults for each possible target.
paul@749	1183
paul@830	1184	for ref in refs:
paul@749	1185	origin = ref.get_origin()
paul@749	1186	params = self.importer.function_parameters.get(origin)
paul@753	1187
paul@749	1188	defaults = self.importer.function_defaults.get(origin)
paul@753	1189	if defaults is not None:
paul@749	1190	all_defaults.add(tuple(defaults))
paul@749	1191
paul@753	1192	if params is not None:
paul@753	1193	all_params.add(tuple(params))
paul@753	1194	min_params.add(len(params) - (defaults and len(defaults) or 0))
paul@753	1195	max_params.add(len(params))
paul@753	1196	else:
paul@753	1197	refs = set()
paul@753	1198	break
paul@753	1199
paul@749	1200	# Where the parameters and defaults are always the same,
paul@749	1201	# permit populating them in advance.
paul@749	1202
paul@753	1203	if refs:
paul@753	1204	if self.uses_keyword_arguments(n):
paul@753	1205	if len(all_params) == 1 and (not all_defaults or len(all_defaults) == 1):
paul@753	1206	parameters = first(all_params)
paul@753	1207	function_defaults = all_defaults and first(all_defaults) or []
paul@753	1208	num_parameters = parameters and len(parameters) or 0
paul@753	1209	num_defaults = function_defaults and len(function_defaults) or 0
paul@753	1210	else:
paul@753	1211	if len(min_params) == 1 and len(max_params) == 1:
paul@753	1212	num_parameters = first(max_params)
paul@753	1213	num_defaults = first(max_params) - first(min_params)
paul@749	1214
paul@749	1215	# Some information about the target may be available and be used to
paul@749	1216	# provide warnings about argument compatibility.
paul@749	1217
paul@749	1218	if self.importer.give_warning("args"):
paul@749	1219	unsuitable = self.get_referenced_attribute_invocations(location)
paul@749	1220
paul@749	1221	if unsuitable:
paul@749	1222	for ref in unsuitable:
paul@749	1223	_objpath = ref.get_origin()
paul@749	1224	print >>sys.stderr, \
paul@749	1225	"In %s, at line %d, inappropriate number of " \
paul@749	1226	"arguments given. Need %d arguments to call %s." % (
paul@753	1227	self.get_namespace_path(), n.lineno,
paul@753	1228	len(self.importer.function_parameters[_objpath]),
paul@749	1229	_objpath)
paul@113	1230
paul@828	1231	# Logical statement about available parameter information.
paul@828	1232
paul@828	1233	known_parameters = num_parameters is not None
paul@828	1234
paul@828	1235	# The source of context information: target or temporary.
paul@828	1236
paul@828	1237	need_context_target = context_required and not have_access_context
paul@828	1238
paul@828	1239	need_context_stored = context_required and context_identity and \
paul@828	1240	context_identity.startswith("__get_context")
paul@828	1241
paul@619	1242	# Determine any readily-accessible target identity.
paul@619	1243
paul@685	1244	target_named = expr.is_name() and str(expr) or None
paul@828	1245	target_identity = target or target_named
paul@828	1246
paul@828	1247	# Use of target information to populate defaults.
paul@828	1248
paul@828	1249	defaults_target_var = not (parameters and function_defaults is not None) and \
paul@828	1250	known_parameters and len(n.args) < num_parameters
paul@828	1251
paul@828	1252	# Use of a temporary target variable in these situations:
paul@828	1253	#
paul@828	1254	# A target provided by an expression needed for defaults.
paul@828	1255	#
paul@828	1256	# A target providing the context but not using a name to do so.
paul@828	1257	#
paul@828	1258	# A target expression involving the definition of a context which may
paul@828	1259	# then be evaluated and stored to ensure that the context is available
paul@828	1260	# during argument evaluation.
paul@828	1261	#
paul@828	1262	# An expression featuring an accessor test.
paul@828	1263
paul@828	1264	need_target_stored = defaults_target_var and not target_identity or \
paul@829	1265	need_context_target and not target_identity or \
paul@828	1266	need_context_stored or \
paul@828	1267	tests_accessor and not target
paul@828	1268
paul@828	1269	# Define stored target details.
paul@828	1270
paul@685	1271	target_stored = "__tmp_targets[%d]" % self.function_target
paul@828	1272	target_var = need_target_stored and target_stored or target_identity
paul@828	1273
paul@828	1274	if need_target_stored:
paul@619	1275	self.record_temp("__tmp_targets")
paul@619	1276
paul@828	1277	if need_context_stored:
paul@828	1278	self.record_temp("__tmp_contexts")
paul@619	1279
paul@858	1280	if stores_accessor:
paul@858	1281	self.record_temp("__tmp_values")
paul@858	1282
paul@122	1283	# Arguments are presented in a temporary frame array with any context
paul@312	1284	# always being the first argument. Where it would be unused, it may be
paul@312	1285	# set to null.
paul@122	1286
paul@312	1287	if context_required:
paul@587	1288	if have_access_context:
paul@851	1289	context_arg = context_identity
paul@587	1290	else:
paul@851	1291	context_arg = "__CONTEXT_AS_VALUE(%s)" % target_var
paul@312	1292	else:
paul@851	1293	context_arg = "__NULL"
paul@851	1294
paul@851	1295	args = [context_arg]
paul@957	1296	reserved_args = 1
paul@312	1297
paul@552	1298	# Complete the array with null values, permitting tests for a complete
paul@552	1299	# set of arguments.
paul@552	1300
paul@753	1301	args += [None] * (num_parameters is None and len(n.args) or num_parameters is not None and num_parameters or 0)
paul@122	1302	kwcodes = []
paul@122	1303	kwargs = []
paul@122	1304
paul@192	1305	# Any invocations in the arguments will store target details in a
paul@192	1306	# different location.
paul@192	1307
paul@676	1308	function_target = self.function_target
paul@828	1309	context_index = self.context_index
paul@858	1310	accessor_index = self.accessor_index
paul@828	1311
paul@828	1312	if need_target_stored:
paul@676	1313	self.next_target()
paul@676	1314
paul@828	1315	if need_context_stored:
paul@828	1316	self.next_context()
paul@192	1317
paul@858	1318	if stores_accessor:
paul@858	1319	self.next_accessor()
paul@858	1320
paul@858	1321	in_parameter_list = self.in_parameter_list
paul@858	1322	self.in_parameter_list = True
paul@858	1323
paul@122	1324	for i, arg in enumerate(n.args):
paul@122	1325	argexpr = self.process_structure_node(arg)
paul@122	1326
paul@122	1327	# Store a keyword argument, either in the argument list or
paul@122	1328	# in a separate keyword argument list for subsequent lookup.
paul@122	1329
paul@122	1330	if isinstance(arg, compiler.ast.Keyword):
paul@113	1331
paul@122	1332	# With knowledge of the target, store the keyword
paul@122	1333	# argument directly.
paul@122	1334
paul@122	1335	if parameters:
paul@373	1336	try:
paul@373	1337	argnum = parameters.index(arg.name)
paul@373	1338	except ValueError:
paul@373	1339	raise TranslateError("Argument %s is not recognised." % arg.name,
paul@373	1340	self.get_namespace_path(), n)
paul@957	1341	args[argnum + reserved_args] = str(argexpr)
paul@122	1342
paul@122	1343	# Otherwise, store the details in a separate collection.
paul@122	1344
paul@122	1345	else:
paul@122	1346	kwargs.append(str(argexpr))
paul@122	1347	kwcodes.append("{%s, %s}" % (
paul@623	1348	encode_ppos(arg.name), encode_pcode(arg.name)))
paul@122	1349
paul@312	1350	# Store non-keyword arguments in the argument list, rejecting
paul@312	1351	# superfluous arguments.
paul@312	1352
paul@122	1353	else:
paul@225	1354	try:
paul@957	1355	args[i + reserved_args] = str(argexpr)
paul@225	1356	except IndexError:
paul@225	1357	raise TranslateError("Too many arguments specified.",
paul@225	1358	self.get_namespace_path(), n)
paul@113	1359
paul@192	1360	# Reference the current target again.
paul@192	1361
paul@858	1362	self.in_parameter_list = in_parameter_list
paul@858	1363
paul@858	1364	if not self.in_parameter_list:
paul@858	1365	self.function_target = function_target
paul@858	1366	self.context_index = context_index
paul@858	1367	self.accessor_index = accessor_index
paul@192	1368
paul@113	1369	# Defaults are added to the frame where arguments are missing.
paul@113	1370
paul@803	1371	if parameters and function_defaults is not None:
paul@753	1372
paul@753	1373	# Visit each default and set any missing arguments. Where keyword
paul@753	1374	# arguments have been used, the defaults must be inspected and, if
paul@753	1375	# necessary, inserted into gaps in the argument list.
paul@749	1376
paul@749	1377	for i, (argname, default) in enumerate(function_defaults):
paul@749	1378	argnum = parameters.index(argname)
paul@957	1379	if not args[argnum + reserved_args]:
paul@957	1380	args[argnum + reserved_args] = "__GETDEFAULT(%s, %d)" % (target_structure, i)
paul@149	1381
paul@753	1382	elif known_parameters:
paul@753	1383
paul@753	1384	# No specific parameter details are provided, but no keyword
paul@753	1385	# arguments are used. Thus, defaults can be supplied using position
paul@753	1386	# information only.
paul@753	1387
paul@753	1388	i = len(n.args)
paul@753	1389	pos = i - (num_parameters - num_defaults)
paul@753	1390	while i < num_parameters:
paul@957	1391	args[i + reserved_args] = "__GETDEFAULT(%s.value, %d)" % (target_var, pos)
paul@753	1392	i += 1
paul@753	1393	pos += 1
paul@753	1394
paul@173	1395	# Test for missing arguments.
paul@173	1396
paul@173	1397	if None in args:
paul@173	1398	raise TranslateError("Not all arguments supplied.",
paul@173	1399	self.get_namespace_path(), n)
paul@173	1400
paul@149	1401	# Encode the arguments.
paul@122	1402
paul@669	1403	# Where literal instantiation is occurring, add an argument indicating
paul@669	1404	# the number of values. The context is excluded.
paul@669	1405
paul@669	1406	if literal_instantiation:
paul@957	1407	argstr = "%d, %s" % (len(args) - reserved_args, ", ".join(args[reserved_args:]))
paul@669	1408	else:
paul@669	1409	argstr = ", ".join(args)
paul@669	1410
paul@122	1411	kwargstr = kwargs and ("__ARGS(%s)" % ", ".join(kwargs)) or "0"
paul@122	1412	kwcodestr = kwcodes and ("__KWARGS(%s)" % ", ".join(kwcodes)) or "0"
paul@122	1413
paul@156	1414	# First, the invocation expression is presented.
paul@113	1415
paul@156	1416	stages = []
paul@828	1417	emit = stages.append
paul@828	1418
paul@828	1419	# Assign and yield any stored target.
paul@828	1420	# The context may be set in the expression.
paul@828	1421
paul@828	1422	if need_target_stored:
paul@828	1423	emit("%s = %s" % (target_var, expr))
paul@828	1424	target_expr = target_var
paul@828	1425
paul@828	1426	# Otherwise, retain the expression for later use.
paul@828	1427
paul@828	1428	else:
paul@828	1429	target_expr = str(expr)
paul@156	1430
paul@685	1431	# Any specific callable is then obtained for invocation.
paul@156	1432
paul@163	1433	if target:
paul@828	1434
paul@828	1435	# An expression involving a test of the accessor providing the target.
paul@828	1436	# This must be emitted in order to perform the test.
paul@828	1437
paul@828	1438	if tests_accessor:
paul@828	1439	emit(str(expr))
paul@828	1440
paul@828	1441	emit(target)
paul@484	1442
paul@685	1443	# Methods accessed via unidentified accessors are obtained for
paul@685	1444	# invocation.
paul@484	1445
paul@242	1446	elif function:
paul@523	1447	if context_required:
paul@838	1448
paul@851	1449	# Avoid further context testing if appropriate.
paul@851	1450
paul@851	1451	if have_access_context and context_verified:
paul@838	1452	emit("__get_function_member(%s)" % target_expr)
paul@838	1453
paul@838	1454	# Otherwise, test the context for the function/method.
paul@838	1455
paul@587	1456	else:
paul@851	1457	emit("__get_function(%s, %s)" % (context_arg, target_expr))
paul@523	1458	else:
paul@828	1459	emit("_get_function_member(%s)" % target_expr)
paul@122	1460
paul@749	1461	# With known parameters, the target can be tested.
paul@749	1462
paul@753	1463	elif known_parameters:
paul@749	1464	if self.always_callable(refs):
paul@851	1465	if context_verified:
paul@828	1466	emit("__get_function_member(%s)" % target_expr)
paul@776	1467	else:
paul@828	1468	emit("__get_function(%s, %s)" % (context_arg, target_expr))
paul@749	1469	else:
paul@828	1470	emit("__check_and_get_function(%s, %s)" % (context_arg, target_expr))
paul@749	1471
paul@122	1472	# With a known target, the function is obtained directly and called.
paul@484	1473	# By putting the invocation at the end of the final element in the
paul@484	1474	# instruction sequence (the stages), the result becomes the result of
paul@484	1475	# the sequence. Moreover, the parameters become part of the sequence
paul@484	1476	# and thereby participate in a guaranteed evaluation order.
paul@122	1477
paul@753	1478	if target or function or known_parameters:
paul@498	1479	stages[-1] += "(%s)" % argstr
paul@498	1480	if instantiation:
paul@498	1481	return InstantiationResult(instantiation, stages)
paul@498	1482	else:
paul@498	1483	return InvocationResult(stages)
paul@113	1484
paul@122	1485	# With unknown targets, the generic invocation function is applied to
paul@122	1486	# the callable and argument collections.
paul@113	1487
paul@122	1488	else:
paul@828	1489	emit("__invoke(\n%s,\n%d, %d, %s, %s,\n%d, %s\n)" % (
paul@828	1490	target_expr,
paul@745	1491	self.always_callable(refs) and 1 or 0,
paul@122	1492	len(kwargs), kwcodestr, kwargstr,
paul@664	1493	len(args), "__ARGS(%s)" % argstr))
paul@498	1494	return InvocationResult(stages)
paul@113	1495
paul@676	1496	def next_target(self):
paul@676	1497
paul@676	1498	"Allocate the next function target storage."
paul@676	1499
paul@676	1500	self.function_target += 1
paul@828	1501	self.max_function_target = max(self.function_target, self.max_function_target)
paul@828	1502
paul@828	1503	def next_context(self):
paul@828	1504
paul@828	1505	"Allocate the next context value storage."
paul@828	1506
paul@828	1507	self.context_index += 1
paul@828	1508	self.max_context_index = max(self.context_index, self.max_context_index)
paul@676	1509
paul@858	1510	def next_accessor(self):
paul@858	1511
paul@858	1512	"Allocate the next accessor value storage."
paul@858	1513
paul@858	1514	self.accessor_index += 1
paul@858	1515	self.max_accessor_index = max(self.accessor_index, self.max_accessor_index)
paul@858	1516
paul@113	1517	def always_callable(self, refs):
paul@113	1518
paul@113	1519	"Determine whether all 'refs' are callable."
paul@113	1520
paul@745	1521	if not refs:
paul@745	1522	return False
paul@745	1523
paul@113	1524	for ref in refs:
paul@748	1525	if not ref.has_kind("<function>") and not self.importer.get_attributes(ref, "__fn__"):
paul@113	1526	return False
paul@748	1527
paul@113	1528	return True
paul@113	1529
paul@113	1530	def need_default_arguments(self, objpath, nargs):
paul@113	1531
paul@113	1532	"""
paul@113	1533	Return whether any default arguments are needed when invoking the object
paul@113	1534	given by 'objpath'.
paul@113	1535	"""
paul@113	1536
paul@113	1537	parameters = self.importer.function_parameters.get(objpath)
paul@113	1538	return nargs < len(parameters)
paul@113	1539
paul@753	1540	def uses_keyword_arguments(self, n):
paul@753	1541
paul@753	1542	"Return whether invocation node 'n' uses keyword arguments."
paul@753	1543
paul@753	1544	for arg in enumerate(n.args):
paul@753	1545	if isinstance(arg, compiler.ast.Keyword):
paul@753	1546	return True
paul@753	1547
paul@753	1548	return False
paul@753	1549
paul@749	1550	def get_attributes_for_attrname(self, attrname):
paul@749	1551
paul@749	1552	"Return a set of all attributes exposed by 'attrname'."
paul@749	1553
paul@749	1554	usage = [(attrname, True, False)]
paul@749	1555	class_types = self.deducer.get_class_types_for_usage(usage)
paul@749	1556	instance_types = self.deducer.get_instance_types_for_usage(usage)
paul@749	1557	module_types = self.deducer.get_module_types_for_usage(usage)
paul@749	1558	attrs = set()
paul@749	1559
paul@749	1560	for ref in combine_types(class_types, instance_types, module_types):
paul@749	1561	attrs.update(self.importer.get_attributes(ref, attrname))
paul@749	1562
paul@749	1563	return attrs
paul@749	1564
paul@113	1565	def process_lambda_node(self, n):
paul@113	1566
paul@113	1567	"Process the given lambda node 'n'."
paul@113	1568
paul@113	1569	name = self.get_lambda_name()
paul@113	1570	function_name = self.get_object_path(name)
paul@858	1571	instance_name = "__get_accessor(%d)" % self.accessor_index
paul@858	1572
paul@858	1573	defaults = self.process_function_defaults(n, name, function_name, instance_name)
paul@149	1574
paul@149	1575	# Without defaults, produce an attribute referring to the function.
paul@149	1576
paul@113	1577	if not defaults:
paul@626	1578	return make_expression("__ATTRVALUE(&%s)" % encode_path(function_name))
paul@149	1579
paul@149	1580	# With defaults, copy the function structure and set the defaults on the
paul@149	1581	# copy.
paul@149	1582
paul@113	1583	else:
paul@858	1584	self.record_temp("__tmp_values")
paul@858	1585	return make_expression("""\
paul@858	1586	(__set_accessor(%d, __ATTRVALUE(__COPY(&%s, sizeof(%s)))),
paul@858	1587	%s,
paul@858	1588	__get_accessor(%d))""" % (
paul@858	1589	self.accessor_index,
paul@151	1590	encode_path(function_name),
paul@151	1591	encode_symbol("obj", function_name),
paul@858	1592	", ".join(defaults),
paul@858	1593	self.accessor_index))
paul@113	1594
paul@113	1595	def process_logical_node(self, n):
paul@113	1596
paul@631	1597	"Process the given operator node 'n'."
paul@113	1598
paul@482	1599	self.record_temp("__tmp_result")
paul@482	1600
paul@631	1601	conjunction = isinstance(n, compiler.ast.And)
paul@141	1602	results = []
paul@113	1603
paul@631	1604	for node in n.nodes:
paul@631	1605	results.append(self.process_structure_node(node))
paul@631	1606
paul@631	1607	return LogicalOperationResult(results, conjunction)
paul@113	1608
paul@113	1609	def process_name_node(self, n, expr=None):
paul@113	1610
paul@113	1611	"Process the given name node 'n' with the optional assignment 'expr'."
paul@113	1612
paul@113	1613	# Determine whether the name refers to a static external entity.
paul@113	1614
paul@113	1615	if n.name in predefined_constants:
paul@399	1616	return PredefinedConstantRef(n.name, expr)
paul@113	1617
paul@173	1618	# Convert literal references, operator function names, and print
paul@173	1619	# function names to references.
paul@113	1620
paul@173	1621	elif n.name.startswith("$L") or n.name.startswith("$op") or \
paul@835	1622	n.name.startswith("$seq") or n.name.startswith("$print"):
paul@423	1623
paul@423	1624	ref, paths = self.importer.get_module(self.name).special[n.name]
paul@113	1625	return TrResolvedNameRef(n.name, ref)
paul@113	1626
paul@113	1627	# Get the appropriate name for the name reference, using the same method
paul@113	1628	# as in the inspector.
paul@113	1629
paul@250	1630	path = self.get_namespace_path()
paul@250	1631	objpath = self.get_object_path(n.name)
paul@250	1632
paul@250	1633	# Determine any assigned globals.
paul@250	1634
paul@250	1635	globals = self.importer.get_module(self.name).scope_globals.get(path)
paul@603	1636
paul@603	1637	# Explicitly declared globals.
paul@603	1638
paul@250	1639	if globals and n.name in globals:
paul@250	1640	objpath = self.get_global_path(n.name)
paul@603	1641	is_global = True
paul@603	1642
paul@603	1643	# Implicitly referenced globals in functions.
paul@603	1644
paul@603	1645	elif self.in_function:
paul@603	1646	is_global = n.name not in self.importer.function_locals[path]
paul@603	1647
paul@603	1648	# Implicitly referenced globals elsewhere.
paul@603	1649
paul@603	1650	else:
paul@603	1651	namespace = self.importer.identify(path)
paul@603	1652	is_global = not self.importer.get_attributes(namespace, n.name)
paul@113	1653
paul@113	1654	# Get the static identity of the name.
paul@113	1655
paul@250	1656	ref = self.importer.identify(objpath)
paul@152	1657	if ref and not ref.get_name():
paul@250	1658	ref = ref.alias(objpath)
paul@113	1659
paul@113	1660	# Obtain any resolved names for non-assignment names.
paul@113	1661
paul@113	1662	if not expr and not ref and self.in_function:
paul@250	1663	locals = self.importer.function_locals.get(path)
paul@113	1664	ref = locals and locals.get(n.name)
paul@113	1665
paul@685	1666	# Find any invocation or alias details.
paul@553	1667
paul@678	1668	name = self.get_name_for_tracking(n.name, is_global=is_global)
paul@700	1669	location = not expr and self.get_access_location(name) or None
paul@553	1670
paul@670	1671	# Mark any local assignments as volatile in exception blocks.
paul@670	1672
paul@670	1673	if expr and self.in_function and not is_global and self.in_try_except:
paul@670	1674	self.make_volatile(n.name)
paul@670	1675
paul@113	1676	# Qualified names are used for resolved static references or for
paul@113	1677	# static namespace members. The reference should be configured to return
paul@113	1678	# such names.
paul@113	1679
paul@685	1680	name_ref = TrResolvedNameRef(n.name, ref, expr=expr, is_global=is_global,
paul@686	1681	location=location)
paul@734	1682	return not expr and self.get_aliases(name_ref) or name_ref
paul@685	1683
paul@685	1684	def get_aliases(self, name_ref):
paul@685	1685
paul@685	1686	"Return alias references for the given 'name_ref'."
paul@685	1687
paul@685	1688	location = name_ref.access_location()
paul@831	1689	accessor_locations = self.deducer.access_index.get(location)
paul@831	1690
paul@831	1691	if not accessor_locations:
paul@831	1692	return None
paul@831	1693
paul@831	1694	refs = set()
paul@831	1695
paul@831	1696	for accessor_location in accessor_locations:
paul@831	1697	alias_refs = self.deducer.referenced_objects.get(accessor_location)
paul@831	1698	if alias_refs:
paul@831	1699	refs.update(alias_refs)
paul@831	1700
paul@831	1701	if refs:
paul@831	1702	return AliasResult(name_ref, refs, location)
paul@831	1703	else:
paul@831	1704	return None
paul@113	1705
paul@670	1706	def make_volatile(self, name):
paul@670	1707
paul@670	1708	"Record 'name' as volatile in the current namespace."
paul@670	1709
paul@670	1710	self.volatile_locals.add(name)
paul@670	1711
paul@113	1712	def process_not_node(self, n):
paul@113	1713
paul@113	1714	"Process the given operator node 'n'."
paul@113	1715
paul@638	1716	return self.make_negation(self.process_structure_node(n.expr))
paul@144	1717
paul@144	1718	def process_raise_node(self, n):
paul@144	1719
paul@144	1720	"Process the given raise node 'n'."
paul@144	1721
paul@144	1722	# NOTE: Determine which raise statement variants should be permitted.
paul@144	1723
paul@176	1724	if n.expr1:
paul@467	1725
paul@467	1726	# Names with accompanying arguments are treated like invocations.
paul@467	1727
paul@467	1728	if n.expr2:
paul@467	1729	call = compiler.ast.CallFunc(n.expr1, [n.expr2])
paul@467	1730	exc = self.process_structure_node(call)
paul@467	1731	self.writestmt("__Raise(%s);" % exc)
paul@317	1732
paul@317	1733	# Raise instances, testing the kind at run-time if necessary and
paul@317	1734	# instantiating any non-instance.
paul@317	1735
paul@317	1736	else:
paul@467	1737	exc = self.process_structure_node(n.expr1)
paul@467	1738
paul@979	1739	if isinstance(exc, TrInstanceRef) or exc.is_well_defined_instance():
paul@467	1740	self.writestmt("__Raise(%s);" % exc)
paul@467	1741	else:
paul@467	1742	self.writestmt("__Raise(__ensure_instance(%s));" % exc)
paul@176	1743	else:
paul@346	1744	self.writestmt("__Throw(__tmp_exc);")
paul@144	1745
paul@144	1746	def process_return_node(self, n):
paul@144	1747
paul@144	1748	"Process the given return node 'n'."
paul@144	1749
paul@144	1750	expr = self.process_structure_node(n.value) or PredefinedConstantRef("None")
paul@189	1751	if self.in_try_finally or self.in_try_except:
paul@144	1752	self.writestmt("__Return(%s);" % expr)
paul@144	1753	else:
paul@144	1754	self.writestmt("return %s;" % expr)
paul@144	1755
paul@144	1756	return ReturnRef()
paul@113	1757
paul@113	1758	def process_try_node(self, n):
paul@113	1759
paul@113	1760	"""
paul@113	1761	Process the given "try...except" node 'n'.
paul@113	1762	"""
paul@113	1763
paul@189	1764	in_try_except = self.in_try_except
paul@189	1765	self.in_try_except = True
paul@189	1766
paul@144	1767	# Use macros to implement exception handling.
paul@113	1768
paul@144	1769	self.writestmt("__Try")
paul@113	1770	self.writeline("{")
paul@113	1771	self.indent += 1
paul@986	1772	self.process_statement_node(n.body)
paul@144	1773
paul@144	1774	# Put the else statement in another try block that handles any raised
paul@144	1775	# exceptions and converts them to exceptions that will not be handled by
paul@144	1776	# the main handling block.
paul@144	1777
paul@144	1778	if n.else_:
paul@144	1779	self.writestmt("__Try")
paul@144	1780	self.writeline("{")
paul@144	1781	self.indent += 1
paul@986	1782	self.process_statement_node(n.else_)
paul@144	1783	self.indent -= 1
paul@144	1784	self.writeline("}")
paul@144	1785	self.writeline("__Catch (__tmp_exc)")
paul@144	1786	self.writeline("{")
paul@144	1787	self.indent += 1
paul@144	1788	self.writeline("if (__tmp_exc.raising) __RaiseElse(__tmp_exc.arg);")
paul@191	1789	self.writeline("else if (__tmp_exc.completing) __Throw(__tmp_exc);")
paul@144	1790	self.indent -= 1
paul@144	1791	self.writeline("}")
paul@144	1792
paul@144	1793	# Complete the try block and enter the finally block, if appropriate.
paul@144	1794
paul@144	1795	if self.in_try_finally:
paul@144	1796	self.writestmt("__Complete;")
paul@144	1797
paul@113	1798	self.indent -= 1
paul@113	1799	self.writeline("}")
paul@113	1800
paul@189	1801	self.in_try_except = in_try_except
paul@189	1802
paul@144	1803	# Handlers are tests within a common handler block.
paul@144	1804
paul@144	1805	self.writeline("__Catch (__tmp_exc)")
paul@144	1806	self.writeline("{")
paul@144	1807	self.indent += 1
paul@144	1808
paul@189	1809	# Introduce an if statement to handle the completion of a try block.
paul@189	1810
paul@189	1811	self.process_try_completion()
paul@189	1812
paul@144	1813	# Handle exceptions in else blocks converted to __RaiseElse, converting
paul@144	1814	# them back to normal exceptions.
paul@144	1815
paul@144	1816	if n.else_:
paul@189	1817	self.writeline("else if (__tmp_exc.raising_else) __Raise(__tmp_exc.arg);")
paul@144	1818
paul@144	1819	# Exception handling.
paul@144	1820
paul@113	1821	for name, var, handler in n.handlers:
paul@144	1822
paul@144	1823	# Test for specific exceptions.
paul@144	1824
paul@113	1825	if name is not None:
paul@986	1826	name_ref = self.process_statement_node(name)
paul@462	1827	self.writeline("else if (__ISINSTANCE(__tmp_exc.arg, %s))" % name_ref)
paul@144	1828	else:
paul@189	1829	self.writeline("else if (1)")
paul@113	1830
paul@113	1831	self.writeline("{")
paul@113	1832	self.indent += 1
paul@113	1833
paul@113	1834	# Establish the local for the handler.
paul@113	1835
paul@113	1836	if var is not None:
paul@261	1837	self.writestmt("%s;" % self.process_name_node(var, make_expression("__tmp_exc.arg")))
paul@113	1838
paul@113	1839	if handler is not None:
paul@986	1840	self.process_statement_node(handler)
paul@113	1841
paul@113	1842	self.indent -= 1
paul@113	1843	self.writeline("}")
paul@113	1844
paul@144	1845	# Re-raise unhandled exceptions.
paul@144	1846
paul@189	1847	self.writeline("else __Throw(__tmp_exc);")
paul@144	1848
paul@144	1849	# End the handler block.
paul@144	1850
paul@144	1851	self.indent -= 1
paul@144	1852	self.writeline("}")
paul@634	1853	print >>self.out
paul@113	1854
paul@113	1855	def process_try_finally_node(self, n):
paul@113	1856
paul@113	1857	"""
paul@113	1858	Process the given "try...finally" node 'n'.
paul@113	1859	"""
paul@113	1860
paul@144	1861	in_try_finally = self.in_try_finally
paul@144	1862	self.in_try_finally = True
paul@113	1863
paul@144	1864	# Use macros to implement exception handling.
paul@144	1865
paul@144	1866	self.writestmt("__Try")
paul@113	1867	self.writeline("{")
paul@113	1868	self.indent += 1
paul@986	1869	self.process_statement_node(n.body)
paul@113	1870	self.indent -= 1
paul@113	1871	self.writeline("}")
paul@144	1872
paul@144	1873	self.in_try_finally = in_try_finally
paul@144	1874
paul@144	1875	# Finally clauses handle special exceptions.
paul@144	1876
paul@144	1877	self.writeline("__Catch (__tmp_exc)")
paul@113	1878	self.writeline("{")
paul@113	1879	self.indent += 1
paul@986	1880	self.process_statement_node(n.final)
paul@144	1881
paul@189	1882	# Introduce an if statement to handle the completion of a try block.
paul@189	1883
paul@189	1884	self.process_try_completion()
paul@189	1885	self.writeline("else __Throw(__tmp_exc);")
paul@189	1886
paul@189	1887	self.indent -= 1
paul@189	1888	self.writeline("}")
paul@634	1889	print >>self.out
paul@189	1890
paul@189	1891	def process_try_completion(self):
paul@189	1892
paul@189	1893	"Generate a test for the completion of a try block."
paul@144	1894
paul@144	1895	self.writestmt("if (__tmp_exc.completing)")
paul@144	1896	self.writeline("{")
paul@144	1897	self.indent += 1
paul@189	1898
paul@316	1899	# Do not return anything at the module level.
paul@316	1900
paul@316	1901	if self.get_namespace_path() != self.name:
paul@189	1902
paul@316	1903	# Only use the normal return statement if no surrounding try blocks
paul@316	1904	# apply.
paul@316	1905
paul@316	1906	if not self.in_try_finally and not self.in_try_except:
paul@316	1907	self.writeline("if (!__ISNULL(__tmp_exc.arg)) return __tmp_exc.arg;")
paul@316	1908	else:
paul@316	1909	self.writeline("if (!__ISNULL(__tmp_exc.arg)) __Throw(__tmp_exc);")
paul@144	1910
paul@113	1911	self.indent -= 1
paul@113	1912	self.writeline("}")
paul@113	1913
paul@113	1914	def process_while_node(self, n):
paul@113	1915
paul@113	1916	"Process the given while node 'n'."
paul@113	1917
paul@113	1918	self.writeline("while (1)")
paul@113	1919	self.writeline("{")
paul@113	1920	self.indent += 1
paul@986	1921	test = self.process_statement_node(n.test)
paul@113	1922
paul@113	1923	# Emit the loop termination condition unless "while <true value>" is
paul@113	1924	# indicated.
paul@113	1925
paul@113	1926	if not (isinstance(test, PredefinedConstantRef) and test.value):
paul@113	1927
paul@629	1928	# Emit a negated test of the continuation condition.
paul@629	1929
paul@638	1930	self.start_if(True, self.make_negation(test))
paul@113	1931	if n.else_:
paul@986	1932	self.process_statement_node(n.else_)
paul@128	1933	self.writestmt("break;")
paul@629	1934	self.end_if()
paul@113	1935
paul@113	1936	in_conditional = self.in_conditional
paul@113	1937	self.in_conditional = True
paul@986	1938	self.process_statement_node(n.body)
paul@113	1939	self.in_conditional = in_conditional
paul@113	1940
paul@113	1941	self.indent -= 1
paul@113	1942	self.writeline("}")
paul@634	1943	print >>self.out
paul@113	1944
paul@482	1945	# Special variable usage.
paul@482	1946
paul@637	1947	def get_temp_path(self):
paul@637	1948
paul@637	1949	"""
paul@637	1950	Return the appropriate namespace path for temporary names in the current
paul@637	1951	namespace.
paul@637	1952	"""
paul@637	1953
paul@637	1954	if self.in_function:
paul@637	1955	return self.get_namespace_path()
paul@637	1956	else:
paul@637	1957	return self.name
paul@637	1958
paul@482	1959	def record_temp(self, name):
paul@482	1960
paul@482	1961	"""
paul@482	1962	Record the use of the temporary 'name' in the current namespace. At the
paul@482	1963	class or module level, the temporary name is associated with the module,
paul@482	1964	since the variable will then be allocated in the module's own main
paul@482	1965	program.
paul@482	1966	"""
paul@482	1967
paul@637	1968	path = self.get_temp_path()
paul@637	1969
paul@637	1970	init_item(self.temp_usage, path, list)
paul@637	1971	self.temp_usage[path].append(name)
paul@637	1972
paul@637	1973	def remove_temps(self, names):
paul@637	1974
paul@637	1975	"""
paul@637	1976	Remove 'names' from temporary storage allocations, each instance
paul@637	1977	removing each request for storage.
paul@637	1978	"""
paul@637	1979
paul@637	1980	path = self.get_temp_path()
paul@637	1981
paul@637	1982	for name in names:
paul@637	1983	if self.uses_temp(path, name):
paul@637	1984	self.temp_usage[path].remove(name)
paul@482	1985
paul@482	1986	def uses_temp(self, path, name):
paul@482	1987
paul@482	1988	"""
paul@482	1989	Return whether the given namespace 'path' employs a temporary variable
paul@482	1990	with the given 'name'. Note that 'path' should only be a module or a
paul@482	1991	function or method, not a class.
paul@482	1992	"""
paul@482	1993
paul@482	1994	return self.temp_usage.has_key(path) and name in self.temp_usage[path]
paul@482	1995
paul@638	1996	def make_negation(self, expr):
paul@638	1997
paul@638	1998	"Return a negated form of 'expr'."
paul@638	1999
paul@638	2000	result = NegationResult(expr)
paul@638	2001
paul@638	2002	# Negation discards the temporary results of its operand.
paul@638	2003
paul@638	2004	temps = expr.discards_temporary()
paul@638	2005	if temps:
paul@638	2006	self.remove_temps(temps)
paul@638	2007
paul@638	2008	return result
paul@638	2009
paul@113	2010	# Output generation.
paul@113	2011
paul@128	2012	def start_output(self):
paul@159	2013
paul@159	2014	"Write the declarations at the top of each source file."
paul@159	2015
paul@128	2016	print >>self.out, """\
paul@128	2017	#include "types.h"
paul@144	2018	#include "exceptions.h"
paul@128	2019	#include "ops.h"
paul@128	2020	#include "progconsts.h"
paul@128	2021	#include "progops.h"
paul@128	2022	#include "progtypes.h"
paul@137	2023	#include "main.h"
paul@128	2024	"""
paul@128	2025
paul@482	2026	def start_unit(self):
paul@482	2027
paul@482	2028	"Record output within a generated function for later use."
paul@482	2029
paul@482	2030	self.out = StringIO()
paul@482	2031
paul@670	2032	def end_unit(self):
paul@670	2033
paul@670	2034	"Restore the output stream."
paul@482	2035
paul@482	2036	out = self.out
paul@482	2037	self.out = self.out_toplevel
paul@670	2038	return out
paul@670	2039
paul@670	2040	def flush_unit(self, name, out):
paul@670	2041
paul@670	2042	"Add declarations and generated code."
paul@482	2043
paul@482	2044	self.write_temporaries(name)
paul@634	2045	print >>self.out
paul@482	2046	out.seek(0)
paul@482	2047	self.out.write(out.read())
paul@482	2048
paul@113	2049	def start_module(self):
paul@159	2050
paul@159	2051	"Write the start of each module's main function."
paul@159	2052
paul@113	2053	print >>self.out, "void __main_%s()" % encode_path(self.name)
paul@113	2054	print >>self.out, "{"
paul@113	2055	self.indent += 1
paul@561	2056
paul@561	2057	# Define temporary variables, excluded from the module structure itself.
paul@561	2058
paul@561	2059	tempnames = []
paul@561	2060
paul@561	2061	for n in self.importer.all_module_attrs[self.name]:
paul@561	2062	if n.startswith("$t"):
paul@561	2063	tempnames.append(encode_path(n))
paul@561	2064
paul@561	2065	if tempnames:
paul@561	2066	tempnames.sort()
paul@561	2067	self.writeline("__attr %s;" % ", ".join(tempnames))
paul@561	2068
paul@482	2069	self.start_unit()
paul@113	2070
paul@113	2071	def end_module(self):
paul@159	2072
paul@159	2073	"End each module by closing its main function."
paul@159	2074
paul@670	2075	out = self.end_unit()
paul@670	2076	self.flush_unit(self.name, out)
paul@113	2077
paul@672	2078	self.indent -= 1
paul@672	2079	print >>self.out, "}"
paul@672	2080
paul@113	2081	def start_function(self, name):
paul@159	2082
paul@159	2083	"Start the function having the given 'name'."
paul@159	2084
paul@113	2085	self.indent += 1
paul@113	2086
paul@670	2087	self.start_unit()
paul@670	2088
paul@670	2089	def end_function(self, name):
paul@670	2090
paul@670	2091	"End the function having the given 'name'."
paul@670	2092
paul@670	2093	out = self.end_unit()
paul@670	2094
paul@673	2095	# Write the signature at the top indentation level.
paul@673	2096
paul@673	2097	self.indent -= 1
paul@664	2098	self.write_parameters(name)
paul@113	2099	print >>self.out, "{"
paul@113	2100
paul@113	2101	# Obtain local names from parameters.
paul@113	2102
paul@113	2103	parameters = self.importer.function_parameters[name]
paul@144	2104	locals = self.importer.function_locals[name].keys()
paul@113	2105	names = []
paul@670	2106	volatile_names = []
paul@113	2107
paul@113	2108	for n in locals:
paul@113	2109
paul@113	2110	# Filter out special names and parameters. Note that self is a local
paul@113	2111	# regardless of whether it originally appeared in the parameters or
paul@113	2112	# not.
paul@113	2113
paul@113	2114	if n.startswith("$l") or n in parameters or n == "self":
paul@113	2115	continue
paul@670	2116	if n in self.volatile_locals:
paul@670	2117	volatile_names.append(encode_path(n))
paul@670	2118	else:
paul@670	2119	names.append(encode_path(n))
paul@113	2120
paul@673	2121	# Emit required local names at the function indentation level.
paul@673	2122
paul@673	2123	self.indent += 1
paul@113	2124
paul@113	2125	if names:
paul@113	2126	names.sort()
paul@113	2127	self.writeline("__attr %s;" % ", ".join(names))
paul@113	2128
paul@670	2129	if volatile_names:
paul@670	2130	volatile_names.sort()
paul@670	2131	self.writeline("volatile __attr %s;" % ", ".join(volatile_names))
paul@670	2132
paul@670	2133	self.flush_unit(name, out)
paul@672	2134
paul@672	2135	self.indent -= 1
paul@672	2136	print >>self.out, "}"
paul@144	2137	print >>self.out
paul@144	2138
paul@664	2139	def write_parameters(self, name):
paul@664	2140
paul@664	2141	"""
paul@664	2142	For the function having the given 'name', write definitions of
paul@664	2143	parameters found in the arguments array.
paul@664	2144	"""
paul@664	2145
paul@664	2146	# Generate any self reference.
paul@664	2147
paul@664	2148	l = []
paul@664	2149
paul@664	2150	if self.is_method(name):
paul@664	2151	l.append("__attr self")
paul@664	2152	else:
paul@664	2153	l.append("__attr __self")
paul@664	2154
paul@664	2155	# Generate aliases for the parameters.
paul@664	2156
paul@664	2157	for parameter in self.importer.function_parameters[name]:
paul@673	2158	l.append("%s__attr %s" % (
paul@673	2159	parameter in self.volatile_locals and "volatile " or "",
paul@673	2160	encode_path(parameter)))
paul@664	2161
paul@664	2162	self.writeline("__attr %s(%s)" % (
paul@664	2163	encode_function_pointer(name), ", ".join(l)))
paul@664	2164
paul@482	2165	def write_temporaries(self, name):
paul@482	2166
paul@482	2167	"Write temporary storage employed by 'name'."
paul@482	2168
paul@858	2169	# Provide space for the recorded number of temporary variables.
paul@591	2170
paul@482	2171	if self.uses_temp(name, "__tmp_targets"):
paul@858	2172	self.writeline("__attr __tmp_targets[%d];" % self.max_function_target)
paul@828	2173
paul@591	2174	if self.uses_temp(name, "__tmp_contexts"):
paul@858	2175	self.writeline("__attr __tmp_contexts[%d];" % self.max_context_index)
paul@858	2176
paul@858	2177	if self.uses_temp(name, "__tmp_values"):
paul@858	2178	self.writeline("__attr __tmp_values[%d];" % self.max_accessor_index)
paul@482	2179
paul@482	2180	# Add temporary variable usage details.
paul@482	2181
paul@592	2182	if self.uses_temp(name, "__tmp_private_context"):
paul@757	2183	self.writeline("__attr __tmp_private_context;")
paul@482	2184	if self.uses_temp(name, "__tmp_target_value"):
paul@757	2185	self.writeline("__attr __tmp_target_value;")
paul@482	2186	if self.uses_temp(name, "__tmp_result"):
paul@482	2187	self.writeline("__attr __tmp_result;")
paul@479	2188
paul@479	2189	module = self.importer.get_module(self.name)
paul@482	2190
paul@482	2191	if name in module.exception_namespaces:
paul@479	2192	self.writeline("__exc __tmp_exc;")
paul@149	2193
paul@631	2194	def start_if(self, first, test_ref):
paul@629	2195	statement = "%sif" % (not first and "else " or "")
paul@629	2196
paul@629	2197	# Consume logical results directly.
paul@629	2198
paul@629	2199	if isinstance(test_ref, LogicalResult):
paul@631	2200	self.writeline("%s %s" % (statement, test_ref.apply_test()))
paul@637	2201	temps = test_ref.discards_temporary()
paul@637	2202	if temps:
paul@637	2203	self.remove_temps(temps)
paul@629	2204	else:
paul@631	2205	self.writeline("%s (__BOOL(%s))" % (statement, test_ref))
paul@629	2206
paul@113	2207	self.writeline("{")
paul@113	2208	self.indent += 1
paul@113	2209
paul@113	2210	def end_if(self):
paul@113	2211	self.indent -= 1
paul@113	2212	self.writeline("}")
paul@113	2213
paul@113	2214	def start_else(self):
paul@113	2215	self.writeline("else")
paul@113	2216	self.writeline("{")
paul@113	2217	self.indent += 1
paul@113	2218
paul@113	2219	def end_else(self):
paul@113	2220	self.indent -= 1
paul@113	2221	self.writeline("}")
paul@113	2222
paul@113	2223	def statement(self, expr):
paul@113	2224	s = str(expr)
paul@113	2225	if s:
paul@128	2226	self.writestmt("%s;" % s)
paul@113	2227
paul@113	2228	def statements(self, results):
paul@113	2229	for result in results:
paul@113	2230	self.statement(result)
paul@113	2231
paul@159	2232	def writeline(self, s):
paul@159	2233	print >>self.out, "%s%s" % (self.pad(), self.indenttext(s, self.indent + 1))
paul@159	2234
paul@159	2235	def writestmt(self, s):
paul@159	2236	self.writeline(s)
paul@159	2237
paul@159	2238	def write_comment(self, s):
paul@159	2239	self.writestmt("/* %s */" % s)
paul@159	2240
paul@113	2241	def pad(self, extra=0):
paul@113	2242	return (self.indent + extra) * self.tabstop
paul@113	2243
paul@113	2244	def indenttext(self, s, levels):
paul@116	2245	lines = s.split("\n")
paul@116	2246	out = [lines[0]]
paul@116	2247	for line in lines[1:]:
paul@116	2248	out.append(levels * self.tabstop + line)
paul@116	2249	if line.endswith("("):
paul@116	2250	levels += 1
paul@122	2251	elif line.startswith(")"):
paul@116	2252	levels -= 1
paul@116	2253	return "\n".join(out)
paul@113	2254
paul@113	2255	# vim: tabstop=4 expandtab shiftwidth=4