Lichen (annotate translator.py in 189558cc45e1)

Lichen

Annotated translator.py

1035:d62de545458a

1030:189558cc45e1

1022:582d834d392d

5 months ago

Paul Boddie

Merged changes from the value-replacement branch.

value-replacement-for-wrapper

paul@113	1	#!/usr/bin/env python
paul@113	2
paul@113	3	"""
paul@113	4	Translate programs.
paul@113	5
paul@971	6	Copyright (C) 2015, 2016, 2017, 2018, 2023 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@972	317	self.reset_temp_limits()
paul@972	318
paul@113	319	self.start_module()
paul@113	320	self.process_structure(node)
paul@113	321	self.end_module()
paul@113	322
paul@113	323	def process_structure(self, node):
paul@113	324
paul@113	325	"Process the given 'node' or result."
paul@113	326
paul@144	327	# Handle processing requests on results.
paul@144	328
paul@636	329	if isinstance(node, Result):
paul@113	330	return node
paul@144	331
paul@144	332	# Handle processing requests on nodes.
paul@144	333
paul@113	334	else:
paul@144	335	l = CommonModule.process_structure(self, node)
paul@144	336
paul@144	337	# Return indications of return statement usage.
paul@144	338
paul@144	339	if l and isinstance(l[-1], ReturnRef):
paul@144	340	return l[-1]
paul@144	341	else:
paul@144	342	return None
paul@113	343
paul@999	344	def process_statement_node(self, node, is_lambda=False):
paul@989	345
paul@989	346	"Process the given statement 'node'."
paul@989	347
paul@989	348	self.reset_temp_counters()
paul@999	349
paul@999	350	if is_lambda:
paul@999	351	self.result_target_name = "__result"
paul@999	352
paul@989	353	return CommonModule.process_statement_node(self, node)
paul@989	354
paul@113	355	def process_structure_node(self, n):
paul@113	356
paul@113	357	"Process the individual node 'n'."
paul@113	358
paul@113	359	# Plain statements emit their expressions.
paul@113	360
paul@113	361	if isinstance(n, compiler.ast.Discard):
paul@113	362	expr = self.process_structure_node(n.expr)
paul@113	363	self.statement(expr)
paul@113	364
paul@314	365	# Module import declarations.
paul@314	366
paul@314	367	elif isinstance(n, compiler.ast.From):
paul@314	368	self.process_from_node(n)
paul@314	369
paul@113	370	# Nodes using operator module functions.
paul@113	371
paul@113	372	elif isinstance(n, compiler.ast.Operator):
paul@113	373	return self.process_operator_node(n)
paul@113	374
paul@113	375	elif isinstance(n, compiler.ast.AugAssign):
paul@113	376	self.process_augassign_node(n)
paul@113	377
paul@113	378	elif isinstance(n, compiler.ast.Compare):
paul@113	379	return self.process_compare_node(n)
paul@113	380
paul@113	381	elif isinstance(n, compiler.ast.Slice):
paul@113	382	return self.process_slice_node(n)
paul@113	383
paul@113	384	elif isinstance(n, compiler.ast.Sliceobj):
paul@113	385	return self.process_sliceobj_node(n)
paul@113	386
paul@113	387	elif isinstance(n, compiler.ast.Subscript):
paul@113	388	return self.process_subscript_node(n)
paul@113	389
paul@113	390	# Classes are visited, but may be ignored if inside functions.
paul@113	391
paul@113	392	elif isinstance(n, compiler.ast.Class):
paul@113	393	self.process_class_node(n)
paul@113	394
paul@113	395	# Functions within namespaces have any dynamic defaults initialised.
paul@113	396
paul@113	397	elif isinstance(n, compiler.ast.Function):
paul@113	398	self.process_function_node(n)
paul@113	399
paul@113	400	# Lambdas are replaced with references to separately-generated
paul@113	401	# functions.
paul@113	402
paul@113	403	elif isinstance(n, compiler.ast.Lambda):
paul@113	404	return self.process_lambda_node(n)
paul@113	405
paul@113	406	# Assignments.
paul@113	407
paul@113	408	elif isinstance(n, compiler.ast.Assign):
paul@113	409
paul@113	410	# Handle each assignment node.
paul@113	411
paul@113	412	for node in n.nodes:
paul@113	413	self.process_assignment_node(node, n.expr)
paul@113	414
paul@113	415	# Accesses.
paul@113	416
paul@113	417	elif isinstance(n, compiler.ast.Getattr):
paul@113	418	return self.process_attribute_access(n)
paul@113	419
paul@113	420	# Names.
paul@113	421
paul@113	422	elif isinstance(n, compiler.ast.Name):
paul@113	423	return self.process_name_node(n)
paul@113	424
paul@113	425	# Loops and conditionals.
paul@113	426
paul@113	427	elif isinstance(n, compiler.ast.For):
paul@113	428	self.process_for_node(n)
paul@113	429
paul@113	430	elif isinstance(n, compiler.ast.While):
paul@113	431	self.process_while_node(n)
paul@113	432
paul@113	433	elif isinstance(n, compiler.ast.If):
paul@113	434	self.process_if_node(n)
paul@113	435
paul@113	436	elif isinstance(n, (compiler.ast.And, compiler.ast.Or)):
paul@113	437	return self.process_logical_node(n)
paul@113	438
paul@113	439	elif isinstance(n, compiler.ast.Not):
paul@113	440	return self.process_not_node(n)
paul@113	441
paul@113	442	# Exception control-flow tracking.
paul@113	443
paul@113	444	elif isinstance(n, compiler.ast.TryExcept):
paul@113	445	self.process_try_node(n)
paul@113	446
paul@113	447	elif isinstance(n, compiler.ast.TryFinally):
paul@113	448	self.process_try_finally_node(n)
paul@113	449
paul@113	450	# Control-flow modification statements.
paul@113	451
paul@113	452	elif isinstance(n, compiler.ast.Break):
paul@128	453	self.writestmt("break;")
paul@113	454
paul@113	455	elif isinstance(n, compiler.ast.Continue):
paul@128	456	self.writestmt("continue;")
paul@113	457
paul@144	458	elif isinstance(n, compiler.ast.Raise):
paul@144	459	self.process_raise_node(n)
paul@144	460
paul@113	461	elif isinstance(n, compiler.ast.Return):
paul@144	462	return self.process_return_node(n)
paul@113	463
paul@173	464	# Print statements.
paul@173	465
paul@173	466	elif isinstance(n, (compiler.ast.Print, compiler.ast.Printnl)):
paul@173	467	self.statement(self.process_print_node(n))
paul@173	468
paul@113	469	# Invocations.
paul@113	470
paul@113	471	elif isinstance(n, compiler.ast.CallFunc):
paul@113	472	return self.process_invocation_node(n)
paul@113	473
paul@113	474	elif isinstance(n, compiler.ast.Keyword):
paul@113	475	return self.process_structure_node(n.expr)
paul@113	476
paul@113	477	# Constant usage.
paul@113	478
paul@113	479	elif isinstance(n, compiler.ast.Const):
paul@405	480	return self.get_literal_instance(n)
paul@113	481
paul@113	482	elif isinstance(n, compiler.ast.Dict):
paul@113	483	return self.get_literal_instance(n, "dict")
paul@113	484
paul@113	485	elif isinstance(n, compiler.ast.List):
paul@113	486	return self.get_literal_instance(n, "list")
paul@113	487
paul@113	488	elif isinstance(n, compiler.ast.Tuple):
paul@113	489	return self.get_literal_instance(n, "tuple")
paul@113	490
paul@113	491	# All other nodes are processed depth-first.
paul@113	492
paul@113	493	else:
paul@144	494	return self.process_structure(n)
paul@113	495
paul@113	496	def process_assignment_node(self, n, expr):
paul@113	497
paul@113	498	"Process the individual node 'n' to be assigned the contents of 'expr'."
paul@113	499
paul@113	500	# Names and attributes are assigned the entire expression.
paul@113	501
paul@113	502	if isinstance(n, compiler.ast.AssName):
paul@971	503	name_ref = self.process_name_node(n, expr, True)
paul@113	504	self.statement(name_ref)
paul@113	505
paul@238	506	# Employ guards after assignments if required.
paul@238	507
paul@238	508	if expr and name_ref.is_name():
paul@238	509	self.generate_guard(name_ref.name)
paul@238	510
paul@113	511	elif isinstance(n, compiler.ast.AssAttr):
paul@124	512	in_assignment = self.in_assignment
paul@989	513	self.result_target_name = "*__get_attr_ref(%d)" % self.attribute_ref_index
paul@124	514	self.in_assignment = self.process_structure_node(expr)
paul@124	515	self.statement(self.process_attribute_access(n))
paul@124	516	self.in_assignment = in_assignment
paul@113	517
paul@113	518	# Lists and tuples are matched against the expression and their
paul@113	519	# items assigned to expression items.
paul@113	520
paul@113	521	elif isinstance(n, (compiler.ast.AssList, compiler.ast.AssTuple)):
paul@113	522	self.process_assignment_node_items(n, expr)
paul@113	523
paul@113	524	# Slices and subscripts are permitted within assignment nodes.
paul@113	525
paul@113	526	elif isinstance(n, compiler.ast.Slice):
paul@113	527	self.statement(self.process_slice_node(n, expr))
paul@113	528
paul@113	529	elif isinstance(n, compiler.ast.Subscript):
paul@113	530	self.statement(self.process_subscript_node(n, expr))
paul@113	531
paul@124	532	def process_attribute_access(self, n):
paul@113	533
paul@368	534	"Process the given attribute access node 'n'."
paul@113	535
paul@113	536	# Obtain any completed chain and return the reference to it.
paul@113	537
paul@113	538	attr_expr = self.process_attribute_chain(n)
paul@113	539	if self.have_access_expression(n):
paul@113	540	return attr_expr
paul@113	541
paul@113	542	# Where the start of the chain of attributes has been reached, process
paul@113	543	# the complete access.
paul@113	544
paul@113	545	name_ref = attr_expr and attr_expr.is_name() and attr_expr
paul@603	546	name = name_ref and self.get_name_for_tracking(name_ref.name, name_ref) or None
paul@113	547
paul@553	548	location = self.get_access_location(name, self.attrs)
paul@113	549	refs = self.get_referenced_attributes(location)
paul@113	550
paul@113	551	# Generate access instructions.
paul@113	552
paul@113	553	subs = {
paul@491	554	"<expr>" : attr_expr,
paul@757	555	"<name>" : attr_expr,
paul@491	556	"<assexpr>" : self.in_assignment,
paul@1000	557	"<new_context>" : self.result_target_name or "__NULL",
paul@482	558	}
paul@482	559
paul@593	560	subs.update(self.temp_subs)
paul@593	561	subs.update(self.op_subs)
paul@482	562
paul@113	563	output = []
paul@482	564	substituted = set()
paul@482	565
paul@591	566	# The context set or retrieved will be that used by any enclosing
paul@591	567	# invocation.
paul@591	568
paul@858	569	accessor_index = self.accessor_index
paul@989	570	attribute_ref_index = self.attribute_ref_index
paul@828	571	context_index = self.context_index
paul@618	572	context_identity = None
paul@776	573	context_identity_verified = False
paul@752	574	final_identity = None
paul@828	575	accessor_test = False
paul@858	576	accessor_stored = False
paul@989	577	attribute_ref_stored = False
paul@591	578
paul@482	579	# Obtain encoded versions of each instruction, accumulating temporary
paul@482	580	# variables.
paul@113	581
paul@653	582	for instruction in self.deducer.access_instructions[location]:
paul@618	583
paul@618	584	# Intercept a special instruction identifying the context.
paul@618	585
paul@776	586	if instruction[0] in ("<context_identity>", "<context_identity_verified>"):
paul@858	587	context_identity, _substituted = \
paul@858	588	encode_access_instruction_arg(instruction[1], subs, instruction[0],
paul@989	589	accessor_index, context_index,
paul@989	590	attribute_ref_index)
paul@776	591	context_identity_verified = instruction[0] == "<context_identity_verified>"
paul@618	592	continue
paul@618	593
paul@752	594	# Intercept a special instruction identifying the target. The value
paul@752	595	# is not encoded since it is used internally.
paul@752	596
paul@776	597	elif instruction[0] == "<final_identity>":
paul@752	598	final_identity = instruction[1]
paul@752	599	continue
paul@752	600
paul@828	601	# Modify test instructions.
paul@828	602
paul@828	603	elif instruction[0] in typename_ops or instruction[0] in type_ops:
paul@828	604	instruction = ("__to_error", instruction)
paul@828	605	accessor_test = True
paul@828	606
paul@1000	607	# Detect accessor storage.
paul@858	608
paul@858	609	elif instruction[0] == "<set_accessor>":
paul@858	610	accessor_stored = True
paul@858	611
paul@1000	612	# Detect attribute reference storage.
paul@989	613
paul@989	614	elif instruction[0] == "<set_attr_ref>":
paul@989	615	attribute_ref_stored = True
paul@989	616	self.next_attribute_ref()
paul@989	617
paul@618	618	# Collect the encoded instruction, noting any temporary variables
paul@618	619	# required by it.
paul@618	620
paul@858	621	encoded, _substituted = encode_access_instruction(instruction, subs,
paul@989	622	accessor_index, context_index,
paul@989	623	attribute_ref_index)
paul@482	624	output.append(encoded)
paul@482	625	substituted.update(_substituted)
paul@482	626
paul@482	627	# Record temporary name usage.
paul@482	628
paul@482	629	for sub in substituted:
paul@593	630	if self.temp_subs.has_key(sub):
paul@593	631	self.record_temp(self.temp_subs[sub])
paul@482	632
paul@752	633	# Get full final identity details.
paul@752	634
paul@752	635	if final_identity and not refs:
paul@843	636	refs = set([self.importer.identify(final_identity)])
paul@752	637
paul@113	638	del self.attrs[0]
paul@858	639	return AttrResult(output, refs, location,
paul@858	640	context_identity, context_identity_verified,
paul@989	641	accessor_test, accessor_stored, attribute_ref_stored)
paul@113	642
paul@593	643	def init_substitutions(self):
paul@593	644
paul@593	645	"""
paul@593	646	Initialise substitutions, defining temporary variable mappings, some of
paul@593	647	which are also used as substitutions, together with operation mappings
paul@593	648	used as substitutions in instructions defined by the optimiser.
paul@593	649	"""
paul@593	650
paul@593	651	self.temp_subs = {
paul@593	652
paul@593	653	# Substitutions used by instructions.
paul@593	654
paul@593	655	"<private_context>" : "__tmp_private_context",
paul@593	656	"<target_accessor>" : "__tmp_target_value",
paul@593	657
paul@593	658	# Mappings to be replaced by those given below.
paul@593	659
paul@858	660	"<accessor>" : "__tmp_values",
paul@989	661	"<attr_ref>" : "__tmp_attr_refs",
paul@593	662	"<context>" : "__tmp_contexts",
paul@601	663	"<test_context_revert>" : "__tmp_contexts",
paul@595	664	"<test_context_static>" : "__tmp_contexts",
paul@593	665	"<set_context>" : "__tmp_contexts",
paul@593	666	"<set_private_context>" : "__tmp_private_context",
paul@858	667	"<set_accessor>" : "__tmp_values",
paul@989	668	"<set_attr_ref>" : "__tmp_attr_refs",
paul@593	669	"<set_target_accessor>" : "__tmp_target_value",
paul@593	670	}
paul@593	671
paul@593	672	self.op_subs = {
paul@858	673	"<accessor>" : "__get_accessor",
paul@989	674	"<attr_ref>" : "__get_attr_ref",
paul@593	675	"<context>" : "__get_context",
paul@601	676	"<test_context_revert>" : "__test_context_revert",
paul@595	677	"<test_context_static>" : "__test_context_static",
paul@593	678	"<set_context>" : "__set_context",
paul@593	679	"<set_private_context>" : "__set_private_context",
paul@593	680	"<set_accessor>" : "__set_accessor",
paul@989	681	"<set_attr_ref>" : "__set_attr_ref",
paul@593	682	"<set_target_accessor>" : "__set_target_accessor",
paul@593	683	}
paul@593	684
paul@113	685	def get_referenced_attributes(self, location):
paul@113	686
paul@113	687	"""
paul@113	688	Convert 'location' to the form used by the deducer and retrieve any
paul@553	689	identified attributes.
paul@113	690	"""
paul@113	691
paul@747	692	# Determine whether any deduced references refer to the accessed
paul@747	693	# attribute.
paul@747	694
paul@791	695	attrnames = location.attrnames
paul@747	696	attrnames = attrnames and attrnames.split(".")
paul@747	697	remaining = attrnames and len(attrnames) > 1
paul@747	698
paul@751	699	access_location = self.deducer.const_accesses.get(location)
paul@751	700
paul@747	701	if remaining and not access_location:
paul@843	702	return set()
paul@843	703
paul@843	704	return self.deducer.get_references_for_access(access_location or location)
paul@113	705
paul@553	706	def get_referenced_attribute_invocations(self, location):
paul@553	707
paul@553	708	"""
paul@553	709	Convert 'location' to the form used by the deducer and retrieve any
paul@553	710	identified attribute invocation details.
paul@553	711	"""
paul@553	712
paul@553	713	access_location = self.deducer.const_accesses.get(location)
paul@553	714	return self.deducer.reference_invocations_unsuitable.get(access_location or location)
paul@553	715
paul@736	716	def get_accessor_kinds(self, location):
paul@736	717
paul@736	718	"Return the accessor kinds for 'location'."
paul@736	719
paul@736	720	return self.deducer.accessor_kinds.get(location)
paul@234	721
paul@553	722	def get_access_location(self, name, attrnames=None):
paul@113	723
paul@113	724	"""
paul@553	725	Using the current namespace, the given 'name', and the 'attrnames'
paul@553	726	employed in an access, return the access location.
paul@113	727	"""
paul@113	728
paul@113	729	path = self.get_path_for_access()
paul@113	730
paul@113	731	# Get the location used by the deducer and optimiser and find any
paul@113	732	# recorded access.
paul@113	733
paul@553	734	attrnames = attrnames and ".".join(self.attrs)
paul@113	735	access_number = self.get_access_number(path, name, attrnames)
paul@113	736	self.update_access_number(path, name, attrnames)
paul@791	737	return AccessLocation(path, name, attrnames, access_number)
paul@113	738
paul@113	739	def get_access_number(self, path, name, attrnames):
paul@113	740	access = name, attrnames
paul@113	741	if self.attr_accesses.has_key(path) and self.attr_accesses[path].has_key(access):
paul@113	742	return self.attr_accesses[path][access]
paul@113	743	else:
paul@113	744	return 0
paul@113	745
paul@113	746	def update_access_number(self, path, name, attrnames):
paul@113	747	access = name, attrnames
paul@113	748	if name:
paul@113	749	init_item(self.attr_accesses, path, dict)
paul@144	750	init_item(self.attr_accesses[path], access, lambda: 0)
paul@144	751	self.attr_accesses[path][access] += 1
paul@113	752
paul@237	753	def get_accessor_location(self, name):
paul@237	754
paul@237	755	"""
paul@237	756	Using the current namespace and the given 'name', return the accessor
paul@237	757	location.
paul@237	758	"""
paul@237	759
paul@237	760	path = self.get_path_for_access()
paul@237	761
paul@237	762	# Get the location used by the deducer and optimiser and find any
paul@237	763	# recorded accessor.
paul@237	764
paul@791	765	version = self.get_accessor_number(path, name)
paul@237	766	self.update_accessor_number(path, name)
paul@791	767	return Location(path, name, None, version)
paul@237	768
paul@237	769	def get_accessor_number(self, path, name):
paul@237	770	if self.attr_accessors.has_key(path) and self.attr_accessors[path].has_key(name):
paul@237	771	return self.attr_accessors[path][name]
paul@237	772	else:
paul@237	773	return 0
paul@237	774
paul@237	775	def update_accessor_number(self, path, name):
paul@237	776	if name:
paul@237	777	init_item(self.attr_accessors, path, dict)
paul@237	778	init_item(self.attr_accessors[path], name, lambda: 0)
paul@237	779	self.attr_accessors[path][name] += 1
paul@237	780
paul@113	781	def process_class_node(self, n):
paul@113	782
paul@113	783	"Process the given class node 'n'."
paul@113	784
paul@320	785	class_name = self.get_object_path(n.name)
paul@320	786
paul@320	787	# Where a class is set conditionally or where the name may refer to
paul@320	788	# different values, assign the name.
paul@320	789
paul@320	790	ref = self.importer.identify(class_name)
paul@320	791
paul@320	792	if not ref.static():
paul@626	793	self.process_assignment_for_object(n.name,
paul@626	794	make_expression("__ATTRVALUE(&%s)" % encode_path(class_name)))
paul@320	795
paul@113	796	self.enter_namespace(n.name)
paul@113	797
paul@113	798	if self.have_object():
paul@113	799	self.write_comment("Class: %s" % class_name)
paul@113	800
paul@257	801	self.initialise_inherited_members(class_name)
paul@257	802
paul@113	803	self.process_structure(n)
paul@257	804	self.write_comment("End class: %s" % class_name)
paul@113	805
paul@113	806	self.exit_namespace()
paul@113	807
paul@257	808	def initialise_inherited_members(self, class_name):
paul@257	809
paul@257	810	"Initialise members of 'class_name' inherited from its ancestors."
paul@257	811
paul@257	812	for name, path in self.importer.all_class_attrs[class_name].items():
paul@257	813	target = "%s.%s" % (class_name, name)
paul@257	814
paul@257	815	# Ignore attributes with definitions.
paul@257	816
paul@257	817	ref = self.importer.identify(target)
paul@257	818	if ref:
paul@257	819	continue
paul@257	820
paul@320	821	# Ignore special type attributes.
paul@320	822
paul@320	823	if is_type_attribute(name):
paul@320	824	continue
paul@320	825
paul@257	826	# Reference inherited attributes.
paul@257	827
paul@257	828	ref = self.importer.identify(path)
paul@257	829	if ref and not ref.static():
paul@257	830	parent, attrname = path.rsplit(".", 1)
paul@257	831
paul@989	832	self.writestmt("__store_via_attr_ref(__get_object_attr_ref(&%s, %s), __load_via_object(&%s, %s));" % (
paul@624	833	encode_path(class_name), name,
paul@624	834	encode_path(parent), attrname
paul@257	835	))
paul@257	836
paul@314	837	def process_from_node(self, n):
paul@314	838
paul@314	839	"Process the given node 'n', importing from another module."
paul@314	840
paul@314	841	path = self.get_namespace_path()
paul@314	842
paul@314	843	# Attempt to obtain the referenced objects.
paul@314	844
paul@314	845	for name, alias in n.names:
paul@314	846	if name == "*":
paul@314	847	raise InspectError("Only explicitly specified names can be imported from modules.", path, n)
paul@314	848
paul@314	849	# Obtain the path of the assigned name.
paul@314	850
paul@314	851	objpath = self.get_object_path(alias or name)
paul@314	852
paul@314	853	# Obtain the identity of the name.
paul@314	854
paul@314	855	ref = self.importer.identify(objpath)
paul@314	856
paul@314	857	# Where the name is not static, assign the value.
paul@314	858
paul@314	859	if ref and not ref.static() and ref.get_name():
paul@314	860	self.writestmt("%s;" %
paul@314	861	TrResolvedNameRef(alias or name, Reference("<var>", None, objpath),
paul@314	862	expr=TrResolvedNameRef(name, ref)))
paul@314	863
paul@113	864	def process_function_body_node(self, n):
paul@113	865
paul@113	866	"""
paul@113	867	Process the given function, lambda, if expression or list comprehension
paul@113	868	node 'n', generating the body.
paul@113	869	"""
paul@113	870
paul@113	871	function_name = self.get_namespace_path()
paul@113	872	self.start_function(function_name)
paul@113	873
paul@113	874	# Process the function body.
paul@113	875
paul@113	876	in_conditional = self.in_conditional
paul@113	877	self.in_conditional = False
paul@972	878
paul@989	879	# Reset temporary storage counters and limits.
paul@972	880
paul@972	881	self.reset_temp_limits()
paul@972	882
paul@972	883	# Reset result target storage details. To be effective, storage
paul@972	884	# locations are not reused between statements.
paul@972	885
paul@972	886	self.max_result_target = 0
paul@971	887	self.result_target = 0
paul@113	888
paul@670	889	# Volatile locals for exception handling.
paul@670	890
paul@670	891	self.volatile_locals = set()
paul@670	892
paul@237	893	# Process any guards defined for the parameters.
paul@237	894
paul@237	895	for name in self.importer.function_parameters.get(function_name):
paul@238	896	self.generate_guard(name)
paul@237	897
paul@816	898	# Also support self in methods, since some mix-in methods may only work
paul@816	899	# with certain descendant classes.
paul@816	900
paul@816	901	if self.in_method():
paul@816	902	self.generate_guard("self")
paul@816	903
paul@819	904	# Make assignments for .name entries in the parameters, provided this is
paul@819	905	# a method.
paul@819	906
paul@819	907	if self.in_method():
paul@819	908	for name in self.importer.function_attr_initialisers.get(function_name) or []:
paul@989	909
paul@989	910	# Treat each assignment as a separate statement.
paul@989	911
paul@989	912	self.reset_temp_counters()
paul@989	913
paul@819	914	self.process_assignment_node(
paul@819	915	compiler.ast.AssAttr(compiler.ast.Name("self"), name, "OP_ASSIGN"),
paul@819	916	compiler.ast.Name(name))
paul@819	917
paul@237	918	# Produce the body and any additional return statement.
paul@237	919
paul@999	920	is_lambda = isinstance(n, compiler.ast.Lambda)
paul@999	921
paul@999	922	expr = self.process_statement_node(n.code, is_lambda) or \
paul@669	923	self.in_method() and \
paul@669	924	function_name.rsplit(".", 1)[-1] == "__init__" and \
paul@669	925	TrResolvedNameRef("self", self.importer.function_locals[function_name]["self"]) or \
paul@669	926	PredefinedConstantRef("None")
paul@669	927
paul@144	928	if not isinstance(expr, ReturnRef):
paul@128	929	self.writestmt("return %s;" % expr)
paul@113	930
paul@113	931	self.in_conditional = in_conditional
paul@113	932
paul@144	933	self.end_function(function_name)
paul@113	934
paul@238	935	def generate_guard(self, name):
paul@238	936
paul@238	937	"""
paul@238	938	Get the accessor details for 'name', found in the current namespace, and
paul@238	939	generate any guards defined for it.
paul@238	940	"""
paul@238	941
paul@238	942	# Obtain the location, keeping track of assignment versions.
paul@238	943
paul@238	944	location = self.get_accessor_location(name)
paul@238	945	test = self.deducer.accessor_guard_tests.get(location)
paul@238	946
paul@238	947	# Generate any guard from the deduced information.
paul@238	948
paul@238	949	if test:
paul@238	950	guard, guard_type = test
paul@238	951
paul@238	952	if guard == "specific":
paul@238	953	ref = first(self.deducer.accessor_all_types[location])
paul@238	954	argstr = "&%s" % encode_path(ref.get_origin())
paul@238	955	elif guard == "common":
paul@238	956	ref = first(self.deducer.accessor_all_general_types[location])
paul@624	957	argstr = encode_path(encode_type_attribute(ref.get_origin()))
paul@238	958	else:
paul@238	959	return
paul@238	960
paul@238	961	# Write a test that raises a TypeError upon failure.
paul@238	962
paul@757	963	self.writestmt("if (!__test_%s_%s(__VALUE(%s), %s)) __raise_type_error();" % (
paul@763	964	guard, guard_type, encode_path(name), argstr))
paul@238	965
paul@113	966	def process_function_node(self, n):
paul@113	967
paul@113	968	"""
paul@113	969	Process the given function, lambda, if expression or list comprehension
paul@113	970	node 'n', generating any initialisation statements.
paul@113	971	"""
paul@113	972
paul@113	973	# Where a function is declared conditionally, use a separate name for
paul@113	974	# the definition, and assign the definition to the stated name.
paul@113	975
paul@196	976	original_name = n.name
paul@196	977
paul@113	978	if self.in_conditional or self.in_function:
paul@113	979	name = self.get_lambda_name()
paul@113	980	else:
paul@113	981	name = n.name
paul@113	982
paul@196	983	objpath = self.get_object_path(name)
paul@196	984
paul@113	985	# Obtain details of the defaults.
paul@113	986
paul@285	987	defaults = self.process_function_defaults(n, name, objpath)
paul@113	988	if defaults:
paul@113	989	for default in defaults:
paul@113	990	self.writeline("%s;" % default)
paul@113	991
paul@196	992	# Where a function is set conditionally or where the name may refer to
paul@196	993	# different values, assign the name.
paul@196	994
paul@196	995	ref = self.importer.identify(objpath)
paul@113	996
paul@196	997	if self.in_conditional or self.in_function:
paul@320	998	self.process_assignment_for_object(original_name, compiler.ast.Name(name))
paul@196	999	elif not ref.static():
paul@267	1000	context = self.is_method(objpath)
paul@267	1001
paul@320	1002	self.process_assignment_for_object(original_name,
paul@626	1003	make_expression("__ATTRVALUE(&%s)" % encode_path(objpath)))
paul@113	1004
paul@285	1005	def process_function_defaults(self, n, name, objpath, instance_name=None):
paul@113	1006
paul@113	1007	"""
paul@113	1008	Process the given function or lambda node 'n', initialising defaults
paul@113	1009	that are dynamically set. The given 'name' indicates the name of the
paul@285	1010	function. The given 'objpath' indicates the origin of the function.
paul@285	1011	The given 'instance_name' indicates the name of any separate instance
paul@285	1012	of the function created to hold the defaults.
paul@113	1013
paul@113	1014	Return a list of operations setting defaults on a function instance.
paul@113	1015	"""
paul@113	1016
paul@113	1017	function_name = self.get_object_path(name)
paul@113	1018	function_defaults = self.importer.function_defaults.get(function_name)
paul@113	1019	if not function_defaults:
paul@113	1020	return None
paul@113	1021
paul@113	1022	# Determine whether any unidentified defaults are involved.
paul@113	1023
paul@285	1024	for argname, default in function_defaults:
paul@285	1025	if not default.static():
paul@285	1026	break
paul@285	1027	else:
paul@113	1028	return None
paul@113	1029
paul@285	1030	# Handle bound methods.
paul@285	1031
paul@285	1032	if not instance_name:
paul@523	1033	instance_name = "&%s" % encode_path(objpath)
paul@757	1034	else:
paul@757	1035	instance_name = "__VALUE(%s)" % instance_name
paul@285	1036
paul@113	1037	# Where defaults are involved but cannot be identified, obtain a new
paul@113	1038	# instance of the lambda and populate the defaults.
paul@113	1039
paul@113	1040	defaults = []
paul@113	1041
paul@113	1042	# Join the original defaults with the inspected defaults.
paul@113	1043
paul@113	1044	original_defaults = [(argname, default) for (argname, default) in compiler.ast.get_defaults(n) if default]
paul@113	1045
paul@113	1046	for i, (original, inspected) in enumerate(map(None, original_defaults, function_defaults)):
paul@113	1047
paul@113	1048	# Obtain any reference for the default.
paul@113	1049
paul@113	1050	if original:
paul@113	1051	argname, default = original
paul@113	1052	name_ref = self.process_structure_node(default)
paul@113	1053	elif inspected:
paul@113	1054	argname, default = inspected
paul@113	1055	name_ref = TrResolvedNameRef(argname, default)
paul@113	1056	else:
paul@113	1057	continue
paul@113	1058
paul@338	1059	# Generate default initialisers except when constants are employed.
paul@338	1060	# Constants should be used when populating the function structures.
paul@338	1061
paul@338	1062	if name_ref and not isinstance(name_ref, TrConstantValueRef):
paul@285	1063	defaults.append("__SETDEFAULT(%s, %s, %s)" % (instance_name, i, name_ref))
paul@113	1064
paul@113	1065	return defaults
paul@113	1066
paul@113	1067	def process_if_node(self, n):
paul@113	1068
paul@113	1069	"""
paul@113	1070	Process the given "if" node 'n'.
paul@113	1071	"""
paul@113	1072
paul@113	1073	first = True
paul@113	1074	for test, body in n.tests:
paul@986	1075	test_ref = self.process_statement_node(test)
paul@113	1076	self.start_if(first, test_ref)
paul@113	1077
paul@113	1078	in_conditional = self.in_conditional
paul@113	1079	self.in_conditional = True
paul@986	1080	self.process_statement_node(body)
paul@113	1081	self.in_conditional = in_conditional
paul@113	1082
paul@113	1083	self.end_if()
paul@113	1084	first = False
paul@113	1085
paul@113	1086	if n.else_:
paul@113	1087	self.start_else()
paul@986	1088	self.process_statement_node(n.else_)
paul@113	1089	self.end_else()
paul@113	1090
paul@634	1091	print >>self.out
paul@634	1092
paul@113	1093	def process_invocation_node(self, n):
paul@113	1094
paul@113	1095	"Process the given invocation node 'n'."
paul@113	1096
paul@590	1097	# Process the expression.
paul@590	1098
paul@113	1099	expr = self.process_structure_node(n.node)
paul@590	1100
paul@590	1101	# Obtain details of the invocation expression.
paul@590	1102
paul@113	1103	objpath = expr.get_origin()
paul@554	1104	location = expr.access_location()
paul@745	1105	refs = expr.references()
paul@552	1106
paul@552	1107	# Identified target details.
paul@552	1108
paul@118	1109	target = None
paul@407	1110	target_structure = None
paul@552	1111
paul@552	1112	# Specific function target information.
paul@552	1113
paul@242	1114	function = None
paul@552	1115
paul@552	1116	# Instantiation involvement.
paul@552	1117
paul@317	1118	instantiation = False
paul@159	1119	literal_instantiation = False
paul@552	1120
paul@552	1121	# Invocation requirements.
paul@552	1122
paul@312	1123	context_required = True
paul@587	1124	have_access_context = isinstance(expr, AttrResult)
paul@852	1125
paul@852	1126	# The context identity is merely the thing providing the context.
paul@852	1127	# A verified context is one that does not need further testing for
paul@852	1128	# suitability.
paul@852	1129
paul@618	1130	context_identity = have_access_context and expr.context()
paul@776	1131	context_verified = have_access_context and expr.context_verified()
paul@852	1132
paul@852	1133	# The presence of any test operations in the accessor expression.
paul@852	1134	# With such operations present, the expression cannot be eliminated.
paul@852	1135
paul@828	1136	tests_accessor = have_access_context and expr.tests_accessor()
paul@858	1137	stores_accessor = have_access_context and expr.stores_accessor()
paul@852	1138
paul@852	1139	# Parameter details and parameter list dimensions.
paul@852	1140
paul@552	1141	parameters = None
paul@753	1142	num_parameters = None
paul@753	1143	num_defaults = None
paul@552	1144
paul@552	1145	# Obtain details of the callable and of its parameters.
paul@113	1146
paul@159	1147	# Literals may be instantiated specially.
paul@159	1148
paul@159	1149	if expr.is_name() and expr.name.startswith("$L") and objpath:
paul@317	1150	instantiation = literal_instantiation = objpath
paul@159	1151	target = encode_literal_instantiator(objpath)
paul@312	1152	context_required = False
paul@159	1153
paul@159	1154	# Identified targets employ function pointers directly.
paul@159	1155
paul@159	1156	elif objpath:
paul@113	1157	parameters = self.importer.function_parameters.get(objpath)
paul@749	1158	function_defaults = self.importer.function_defaults.get(objpath)
paul@753	1159	num_parameters = parameters and len(parameters) or 0
paul@753	1160	num_defaults = function_defaults and len(function_defaults) or 0
paul@234	1161
paul@234	1162	# Class invocation involves instantiators.
paul@234	1163
paul@118	1164	if expr.has_kind("<class>"):
paul@317	1165	instantiation = objpath
paul@118	1166	target = encode_instantiator_pointer(objpath)
paul@540	1167	init_ref = self.importer.all_class_attrs[objpath]["__init__"]
paul@540	1168	target_structure = "&%s" % encode_path(init_ref)
paul@312	1169	context_required = False
paul@234	1170
paul@234	1171	# Only plain functions and bound methods employ function pointers.
paul@234	1172
paul@118	1173	elif expr.has_kind("<function>"):
paul@242	1174	function = objpath
paul@234	1175
paul@234	1176	# Test for functions and methods.
paul@234	1177
paul@407	1178	context_required = self.is_method(objpath)
paul@685	1179
paul@736	1180	accessor_kinds = location and self.get_accessor_kinds(location)
paul@685	1181
paul@312	1182	instance_accessor = accessor_kinds and \
paul@312	1183	len(accessor_kinds) == 1 and \
paul@312	1184	first(accessor_kinds) == "<instance>"
paul@234	1185
paul@407	1186	# Only identify certain bound methods or functions.
paul@407	1187
paul@407	1188	if not context_required or instance_accessor:
paul@234	1189	target = encode_function_pointer(objpath)
paul@407	1190
paul@407	1191	# Access bound method defaults even if it is not clear whether
paul@407	1192	# the accessor is appropriate.
paul@407	1193
paul@523	1194	target_structure = "&%s" % encode_path(objpath)
paul@312	1195
paul@749	1196	# Other targets are retrieved at run-time.
paul@749	1197
paul@749	1198	else:
paul@749	1199	if location:
paul@791	1200	attrnames = location.attrnames
paul@749	1201	attrname = attrnames and attrnames.rsplit(".", 1)[-1]
paul@749	1202
paul@830	1203	# Determine common aspects of any identifiable targets.
paul@830	1204
paul@830	1205	if attrname or refs:
paul@749	1206	all_params = set()
paul@749	1207	all_defaults = set()
paul@753	1208	min_params = set()
paul@753	1209	max_params = set()
paul@830	1210
paul@830	1211	# Employ references from the expression or find all
paul@830	1212	# possible attributes for the given attribute name.
paul@830	1213
paul@830	1214	refs = refs or self.get_attributes_for_attrname(attrname)
paul@749	1215
paul@749	1216	# Obtain parameters and defaults for each possible target.
paul@749	1217
paul@830	1218	for ref in refs:
paul@749	1219	origin = ref.get_origin()
paul@749	1220	params = self.importer.function_parameters.get(origin)
paul@753	1221
paul@749	1222	defaults = self.importer.function_defaults.get(origin)
paul@753	1223	if defaults is not None:
paul@749	1224	all_defaults.add(tuple(defaults))
paul@749	1225
paul@753	1226	if params is not None:
paul@753	1227	all_params.add(tuple(params))
paul@753	1228	min_params.add(len(params) - (defaults and len(defaults) or 0))
paul@753	1229	max_params.add(len(params))
paul@753	1230	else:
paul@753	1231	refs = set()
paul@753	1232	break
paul@753	1233
paul@749	1234	# Where the parameters and defaults are always the same,
paul@749	1235	# permit populating them in advance.
paul@749	1236
paul@753	1237	if refs:
paul@753	1238	if self.uses_keyword_arguments(n):
paul@753	1239	if len(all_params) == 1 and (not all_defaults or len(all_defaults) == 1):
paul@753	1240	parameters = first(all_params)
paul@753	1241	function_defaults = all_defaults and first(all_defaults) or []
paul@753	1242	num_parameters = parameters and len(parameters) or 0
paul@753	1243	num_defaults = function_defaults and len(function_defaults) or 0
paul@753	1244	else:
paul@753	1245	if len(min_params) == 1 and len(max_params) == 1:
paul@753	1246	num_parameters = first(max_params)
paul@753	1247	num_defaults = first(max_params) - first(min_params)
paul@749	1248
paul@749	1249	# Some information about the target may be available and be used to
paul@749	1250	# provide warnings about argument compatibility.
paul@749	1251
paul@749	1252	if self.importer.give_warning("args"):
paul@749	1253	unsuitable = self.get_referenced_attribute_invocations(location)
paul@749	1254
paul@749	1255	if unsuitable:
paul@749	1256	for ref in unsuitable:
paul@749	1257	_objpath = ref.get_origin()
paul@749	1258	print >>sys.stderr, \
paul@749	1259	"In %s, at line %d, inappropriate number of " \
paul@749	1260	"arguments given. Need %d arguments to call %s." % (
paul@753	1261	self.get_namespace_path(), n.lineno,
paul@753	1262	len(self.importer.function_parameters[_objpath]),
paul@749	1263	_objpath)
paul@113	1264
paul@828	1265	# Logical statement about available parameter information.
paul@828	1266
paul@828	1267	known_parameters = num_parameters is not None
paul@828	1268
paul@828	1269	# The source of context information: target or temporary.
paul@828	1270
paul@828	1271	need_context_target = context_required and not have_access_context
paul@828	1272
paul@828	1273	need_context_stored = context_required and context_identity and \
paul@828	1274	context_identity.startswith("__get_context")
paul@828	1275
paul@619	1276	# Determine any readily-accessible target identity.
paul@619	1277
paul@685	1278	target_named = expr.is_name() and str(expr) or None
paul@828	1279	target_identity = target or target_named
paul@828	1280
paul@828	1281	# Use of target information to populate defaults.
paul@828	1282
paul@828	1283	defaults_target_var = not (parameters and function_defaults is not None) and \
paul@828	1284	known_parameters and len(n.args) < num_parameters
paul@828	1285
paul@828	1286	# Use of a temporary target variable in these situations:
paul@828	1287	#
paul@828	1288	# A target provided by an expression needed for defaults.
paul@828	1289	#
paul@828	1290	# A target providing the context but not using a name to do so.
paul@828	1291	#
paul@828	1292	# A target expression involving the definition of a context which may
paul@828	1293	# then be evaluated and stored to ensure that the context is available
paul@828	1294	# during argument evaluation.
paul@828	1295	#
paul@828	1296	# An expression featuring an accessor test.
paul@828	1297
paul@828	1298	need_target_stored = defaults_target_var and not target_identity or \
paul@829	1299	need_context_target and not target_identity or \
paul@828	1300	need_context_stored or \
paul@828	1301	tests_accessor and not target
paul@828	1302
paul@828	1303	# Define stored target details.
paul@828	1304
paul@685	1305	target_stored = "__tmp_targets[%d]" % self.function_target
paul@828	1306	target_var = need_target_stored and target_stored or target_identity
paul@828	1307
paul@828	1308	if need_target_stored:
paul@619	1309	self.record_temp("__tmp_targets")
paul@619	1310
paul@828	1311	if need_context_stored:
paul@828	1312	self.record_temp("__tmp_contexts")
paul@619	1313
paul@858	1314	if stores_accessor:
paul@858	1315	self.record_temp("__tmp_values")
paul@858	1316
paul@971	1317	# Employ result targets only in functions.
paul@971	1318
paul@971	1319	if self.in_function:
paul@971	1320	if self.result_target_name:
paul@971	1321	result_target = self.result_target_name
paul@971	1322	self.result_target_name = None
paul@971	1323	else:
paul@971	1324	result_target = "__tmp_results[%d]" % self.result_target
paul@971	1325	self.record_temp("__tmp_results")
paul@971	1326	self.next_result()
paul@971	1327	else:
paul@989	1328	result_target = None
paul@971	1329
paul@122	1330	# Arguments are presented in a temporary frame array with any context
paul@312	1331	# always being the first argument. Where it would be unused, it may be
paul@312	1332	# set to null.
paul@122	1333
paul@312	1334	if context_required:
paul@587	1335	if have_access_context:
paul@851	1336	context_arg = context_identity
paul@587	1337	else:
paul@851	1338	context_arg = "__CONTEXT_AS_VALUE(%s)" % target_var
paul@312	1339	else:
paul@851	1340	context_arg = "__NULL"
paul@851	1341
paul@971	1342	# Start with result target and context arguments for each invocation.
paul@971	1343
paul@989	1344	args = [result_target or "__NULL", context_arg]
paul@982	1345	reserved_args = 2
paul@312	1346
paul@552	1347	# Complete the array with null values, permitting tests for a complete
paul@552	1348	# set of arguments.
paul@552	1349
paul@753	1350	args += [None] * (num_parameters is None and len(n.args) or num_parameters is not None and num_parameters or 0)
paul@122	1351	kwcodes = []
paul@122	1352	kwargs = []
paul@122	1353
paul@192	1354	# Any invocations in the arguments will store target details in a
paul@192	1355	# different location.
paul@192	1356
paul@676	1357	function_target = self.function_target
paul@828	1358	context_index = self.context_index
paul@858	1359	accessor_index = self.accessor_index
paul@828	1360
paul@828	1361	if need_target_stored:
paul@676	1362	self.next_target()
paul@676	1363
paul@828	1364	if need_context_stored:
paul@828	1365	self.next_context()
paul@192	1366
paul@858	1367	if stores_accessor:
paul@858	1368	self.next_accessor()
paul@858	1369
paul@858	1370	in_parameter_list = self.in_parameter_list
paul@858	1371	self.in_parameter_list = True
paul@858	1372
paul@122	1373	for i, arg in enumerate(n.args):
paul@122	1374	argexpr = self.process_structure_node(arg)
paul@122	1375
paul@971	1376	# Convert any attributes indicating value replacement.
paul@971	1377
paul@989	1378	if isinstance(argexpr, InvocationResult) and argexpr.result_target:
paul@989	1379	argexprstr = "__set_attr(&%s, %s)" % (argexpr.result_target, argexpr)
paul@971	1380	else:
paul@971	1381	argexprstr = str(argexpr)
paul@971	1382
paul@122	1383	# Store a keyword argument, either in the argument list or
paul@122	1384	# in a separate keyword argument list for subsequent lookup.
paul@122	1385
paul@122	1386	if isinstance(arg, compiler.ast.Keyword):
paul@113	1387
paul@122	1388	# With knowledge of the target, store the keyword
paul@122	1389	# argument directly.
paul@122	1390
paul@122	1391	if parameters:
paul@373	1392	try:
paul@373	1393	argnum = parameters.index(arg.name)
paul@373	1394	except ValueError:
paul@373	1395	raise TranslateError("Argument %s is not recognised." % arg.name,
paul@373	1396	self.get_namespace_path(), n)
paul@982	1397	args[argnum + reserved_args] = argexprstr
paul@122	1398
paul@122	1399	# Otherwise, store the details in a separate collection.
paul@122	1400
paul@122	1401	else:
paul@971	1402	kwargs.append(argexprstr)
paul@122	1403	kwcodes.append("{%s, %s}" % (
paul@623	1404	encode_ppos(arg.name), encode_pcode(arg.name)))
paul@122	1405
paul@312	1406	# Store non-keyword arguments in the argument list, rejecting
paul@312	1407	# superfluous arguments.
paul@312	1408
paul@122	1409	else:
paul@225	1410	try:
paul@982	1411	args[i + reserved_args] = argexprstr
paul@225	1412	except IndexError:
paul@225	1413	raise TranslateError("Too many arguments specified.",
paul@225	1414	self.get_namespace_path(), n)
paul@113	1415
paul@192	1416	# Reference the current target again.
paul@192	1417
paul@858	1418	self.in_parameter_list = in_parameter_list
paul@858	1419
paul@858	1420	if not self.in_parameter_list:
paul@858	1421	self.function_target = function_target
paul@858	1422	self.context_index = context_index
paul@858	1423	self.accessor_index = accessor_index
paul@192	1424
paul@113	1425	# Defaults are added to the frame where arguments are missing.
paul@113	1426
paul@803	1427	if parameters and function_defaults is not None:
paul@753	1428
paul@753	1429	# Visit each default and set any missing arguments. Where keyword
paul@753	1430	# arguments have been used, the defaults must be inspected and, if
paul@753	1431	# necessary, inserted into gaps in the argument list.
paul@749	1432
paul@749	1433	for i, (argname, default) in enumerate(function_defaults):
paul@749	1434	argnum = parameters.index(argname)
paul@957	1435	if not args[argnum + reserved_args]:
paul@957	1436	args[argnum + reserved_args] = "__GETDEFAULT(%s, %d)" % (target_structure, i)
paul@149	1437
paul@753	1438	elif known_parameters:
paul@753	1439
paul@753	1440	# No specific parameter details are provided, but no keyword
paul@753	1441	# arguments are used. Thus, defaults can be supplied using position
paul@753	1442	# information only.
paul@753	1443
paul@753	1444	i = len(n.args)
paul@753	1445	pos = i - (num_parameters - num_defaults)
paul@753	1446	while i < num_parameters:
paul@957	1447	args[i + reserved_args] = "__GETDEFAULT(%s.value, %d)" % (target_var, pos)
paul@753	1448	i += 1
paul@753	1449	pos += 1
paul@753	1450
paul@173	1451	# Test for missing arguments.
paul@173	1452
paul@173	1453	if None in args:
paul@173	1454	raise TranslateError("Not all arguments supplied.",
paul@173	1455	self.get_namespace_path(), n)
paul@173	1456
paul@149	1457	# Encode the arguments.
paul@122	1458
paul@669	1459	# Where literal instantiation is occurring, add an argument indicating
paul@971	1460	# the number of values. The result target and context are excluded.
paul@669	1461
paul@669	1462	if literal_instantiation:
paul@957	1463	argstr = "%d, %s" % (len(args) - reserved_args, ", ".join(args[reserved_args:]))
paul@669	1464	else:
paul@669	1465	argstr = ", ".join(args)
paul@669	1466
paul@122	1467	kwargstr = kwargs and ("__ARGS(%s)" % ", ".join(kwargs)) or "0"
paul@122	1468	kwcodestr = kwcodes and ("__KWARGS(%s)" % ", ".join(kwcodes)) or "0"
paul@122	1469
paul@156	1470	# First, the invocation expression is presented.
paul@113	1471
paul@156	1472	stages = []
paul@828	1473	emit = stages.append
paul@828	1474
paul@828	1475	# Assign and yield any stored target.
paul@828	1476	# The context may be set in the expression.
paul@828	1477
paul@828	1478	if need_target_stored:
paul@828	1479	emit("%s = %s" % (target_var, expr))
paul@828	1480	target_expr = target_var
paul@828	1481
paul@828	1482	# Otherwise, retain the expression for later use.
paul@828	1483
paul@828	1484	else:
paul@828	1485	target_expr = str(expr)
paul@156	1486
paul@685	1487	# Any specific callable is then obtained for invocation.
paul@156	1488
paul@163	1489	if target:
paul@828	1490
paul@828	1491	# An expression involving a test of the accessor providing the target.
paul@828	1492	# This must be emitted in order to perform the test.
paul@828	1493
paul@828	1494	if tests_accessor:
paul@828	1495	emit(str(expr))
paul@828	1496
paul@828	1497	emit(target)
paul@484	1498
paul@685	1499	# Methods accessed via unidentified accessors are obtained for
paul@685	1500	# invocation.
paul@484	1501
paul@242	1502	elif function:
paul@523	1503	if context_required:
paul@838	1504
paul@851	1505	# Avoid further context testing if appropriate.
paul@851	1506
paul@851	1507	if have_access_context and context_verified:
paul@838	1508	emit("__get_function_member(%s)" % target_expr)
paul@838	1509
paul@838	1510	# Otherwise, test the context for the function/method.
paul@838	1511
paul@587	1512	else:
paul@851	1513	emit("__get_function(%s, %s)" % (context_arg, target_expr))
paul@523	1514	else:
paul@828	1515	emit("_get_function_member(%s)" % target_expr)
paul@122	1516
paul@749	1517	# With known parameters, the target can be tested.
paul@749	1518
paul@753	1519	elif known_parameters:
paul@749	1520	if self.always_callable(refs):
paul@851	1521	if context_verified:
paul@828	1522	emit("__get_function_member(%s)" % target_expr)
paul@776	1523	else:
paul@828	1524	emit("__get_function(%s, %s)" % (context_arg, target_expr))
paul@749	1525	else:
paul@828	1526	emit("__check_and_get_function(%s, %s)" % (context_arg, target_expr))
paul@749	1527
paul@122	1528	# With a known target, the function is obtained directly and called.
paul@484	1529	# By putting the invocation at the end of the final element in the
paul@484	1530	# instruction sequence (the stages), the result becomes the result of
paul@484	1531	# the sequence. Moreover, the parameters become part of the sequence
paul@484	1532	# and thereby participate in a guaranteed evaluation order.
paul@122	1533
paul@753	1534	if target or function or known_parameters:
paul@498	1535	stages[-1] += "(%s)" % argstr
paul@498	1536	if instantiation:
paul@498	1537	return InstantiationResult(instantiation, stages)
paul@498	1538	else:
paul@978	1539	return InvocationResult(result_target, stages)
paul@113	1540
paul@122	1541	# With unknown targets, the generic invocation function is applied to
paul@122	1542	# the callable and argument collections.
paul@113	1543
paul@122	1544	else:
paul@828	1545	emit("__invoke(\n%s,\n%d, %d, %s, %s,\n%d, %s\n)" % (
paul@828	1546	target_expr,
paul@745	1547	self.always_callable(refs) and 1 or 0,
paul@122	1548	len(kwargs), kwcodestr, kwargstr,
paul@664	1549	len(args), "__ARGS(%s)" % argstr))
paul@978	1550	return InvocationResult(result_target, stages)
paul@113	1551
paul@972	1552	def reset_temp_counters(self):
paul@972	1553
paul@972	1554	"Reset the target counters."
paul@972	1555
paul@972	1556	self.function_target = 0
paul@972	1557	self.context_index = 0
paul@972	1558	self.accessor_index = 0
paul@989	1559	self.attribute_ref_index = 0
paul@989	1560	self.result_target_name = None
paul@972	1561
paul@972	1562	def reset_temp_limits(self):
paul@972	1563
paul@972	1564	"Reset the target counter limits."
paul@972	1565
paul@972	1566	self.max_function_target = 0
paul@972	1567	self.max_context_index = 0
paul@972	1568	self.max_accessor_index = 0
paul@989	1569	self.max_attribute_ref_index = 0
paul@972	1570
paul@971	1571	def next_result(self):
paul@971	1572
paul@971	1573	"Allocate the next result target storage."
paul@971	1574
paul@971	1575	self.result_target += 1
paul@971	1576	self.max_result_target = max(self.result_target, self.max_result_target)
paul@113	1577
paul@676	1578	def next_target(self):
paul@676	1579
paul@676	1580	"Allocate the next function target storage."
paul@676	1581
paul@676	1582	self.function_target += 1
paul@828	1583	self.max_function_target = max(self.function_target, self.max_function_target)
paul@828	1584
paul@828	1585	def next_context(self):
paul@828	1586
paul@828	1587	"Allocate the next context value storage."
paul@828	1588
paul@828	1589	self.context_index += 1
paul@828	1590	self.max_context_index = max(self.context_index, self.max_context_index)
paul@676	1591
paul@858	1592	def next_accessor(self):
paul@858	1593
paul@858	1594	"Allocate the next accessor value storage."
paul@858	1595
paul@858	1596	self.accessor_index += 1
paul@858	1597	self.max_accessor_index = max(self.accessor_index, self.max_accessor_index)
paul@858	1598
paul@989	1599	def next_attribute_ref(self):
paul@989	1600
paul@989	1601	"Allocate the next attribute reference value storage."
paul@989	1602
paul@989	1603	self.attribute_ref_index += 1
paul@989	1604	self.max_attribute_ref_index = max(self.attribute_ref_index, self.max_attribute_ref_index)
paul@989	1605
paul@113	1606	def always_callable(self, refs):
paul@113	1607
paul@113	1608	"Determine whether all 'refs' are callable."
paul@113	1609
paul@745	1610	if not refs:
paul@745	1611	return False
paul@745	1612
paul@113	1613	for ref in refs:
paul@748	1614	if not ref.has_kind("<function>") and not self.importer.get_attributes(ref, "__fn__"):
paul@113	1615	return False
paul@748	1616
paul@113	1617	return True
paul@113	1618
paul@113	1619	def need_default_arguments(self, objpath, nargs):
paul@113	1620
paul@113	1621	"""
paul@113	1622	Return whether any default arguments are needed when invoking the object
paul@113	1623	given by 'objpath'.
paul@113	1624	"""
paul@113	1625
paul@113	1626	parameters = self.importer.function_parameters.get(objpath)
paul@113	1627	return nargs < len(parameters)
paul@113	1628
paul@753	1629	def uses_keyword_arguments(self, n):
paul@753	1630
paul@753	1631	"Return whether invocation node 'n' uses keyword arguments."
paul@753	1632
paul@753	1633	for arg in enumerate(n.args):
paul@753	1634	if isinstance(arg, compiler.ast.Keyword):
paul@753	1635	return True
paul@753	1636
paul@753	1637	return False
paul@753	1638
paul@749	1639	def get_attributes_for_attrname(self, attrname):
paul@749	1640
paul@749	1641	"Return a set of all attributes exposed by 'attrname'."
paul@749	1642
paul@749	1643	usage = [(attrname, True, False)]
paul@749	1644	class_types = self.deducer.get_class_types_for_usage(usage)
paul@749	1645	instance_types = self.deducer.get_instance_types_for_usage(usage)
paul@749	1646	module_types = self.deducer.get_module_types_for_usage(usage)
paul@749	1647	attrs = set()
paul@749	1648
paul@749	1649	for ref in combine_types(class_types, instance_types, module_types):
paul@749	1650	attrs.update(self.importer.get_attributes(ref, attrname))
paul@749	1651
paul@749	1652	return attrs
paul@749	1653
paul@113	1654	def process_lambda_node(self, n):
paul@113	1655
paul@113	1656	"Process the given lambda node 'n'."
paul@113	1657
paul@113	1658	name = self.get_lambda_name()
paul@113	1659	function_name = self.get_object_path(name)
paul@858	1660	instance_name = "__get_accessor(%d)" % self.accessor_index
paul@858	1661
paul@858	1662	defaults = self.process_function_defaults(n, name, function_name, instance_name)
paul@149	1663
paul@149	1664	# Without defaults, produce an attribute referring to the function.
paul@149	1665
paul@113	1666	if not defaults:
paul@626	1667	return make_expression("__ATTRVALUE(&%s)" % encode_path(function_name))
paul@149	1668
paul@149	1669	# With defaults, copy the function structure and set the defaults on the
paul@149	1670	# copy.
paul@149	1671
paul@113	1672	else:
paul@858	1673	self.record_temp("__tmp_values")
paul@858	1674	return make_expression("""\
paul@858	1675	(__set_accessor(%d, __ATTRVALUE(__COPY(&%s, sizeof(%s)))),
paul@858	1676	%s,
paul@858	1677	__get_accessor(%d))""" % (
paul@858	1678	self.accessor_index,
paul@151	1679	encode_path(function_name),
paul@151	1680	encode_symbol("obj", function_name),
paul@858	1681	", ".join(defaults),
paul@858	1682	self.accessor_index))
paul@113	1683
paul@113	1684	def process_logical_node(self, n):
paul@113	1685
paul@631	1686	"Process the given operator node 'n'."
paul@113	1687
paul@482	1688	self.record_temp("__tmp_result")
paul@482	1689
paul@631	1690	conjunction = isinstance(n, compiler.ast.And)
paul@141	1691	results = []
paul@113	1692
paul@631	1693	for node in n.nodes:
paul@631	1694	results.append(self.process_structure_node(node))
paul@631	1695
paul@631	1696	return LogicalOperationResult(results, conjunction)
paul@113	1697
paul@971	1698	def process_name_node(self, n, expr=None, process_expr=False):
paul@113	1699
paul@113	1700	"Process the given name node 'n' with the optional assignment 'expr'."
paul@113	1701
paul@113	1702	# Determine whether the name refers to a static external entity.
paul@113	1703
paul@113	1704	if n.name in predefined_constants:
paul@399	1705	return PredefinedConstantRef(n.name, expr)
paul@113	1706
paul@173	1707	# Convert literal references, operator function names, and print
paul@173	1708	# function names to references.
paul@113	1709
paul@173	1710	elif n.name.startswith("$L") or n.name.startswith("$op") or \
paul@835	1711	n.name.startswith("$seq") or n.name.startswith("$print"):
paul@423	1712
paul@423	1713	ref, paths = self.importer.get_module(self.name).special[n.name]
paul@113	1714	return TrResolvedNameRef(n.name, ref)
paul@113	1715
paul@113	1716	# Get the appropriate name for the name reference, using the same method
paul@113	1717	# as in the inspector.
paul@113	1718
paul@250	1719	path = self.get_namespace_path()
paul@250	1720	objpath = self.get_object_path(n.name)
paul@250	1721
paul@250	1722	# Determine any assigned globals.
paul@250	1723
paul@250	1724	globals = self.importer.get_module(self.name).scope_globals.get(path)
paul@603	1725
paul@603	1726	# Explicitly declared globals.
paul@603	1727
paul@250	1728	if globals and n.name in globals:
paul@250	1729	objpath = self.get_global_path(n.name)
paul@603	1730	is_global = True
paul@603	1731
paul@603	1732	# Implicitly referenced globals in functions.
paul@603	1733
paul@603	1734	elif self.in_function:
paul@603	1735	is_global = n.name not in self.importer.function_locals[path]
paul@603	1736
paul@603	1737	# Implicitly referenced globals elsewhere.
paul@603	1738
paul@603	1739	else:
paul@603	1740	namespace = self.importer.identify(path)
paul@603	1741	is_global = not self.importer.get_attributes(namespace, n.name)
paul@113	1742
paul@113	1743	# Get the static identity of the name.
paul@113	1744
paul@250	1745	ref = self.importer.identify(objpath)
paul@152	1746	if ref and not ref.get_name():
paul@250	1747	ref = ref.alias(objpath)
paul@113	1748
paul@113	1749	# Obtain any resolved names for non-assignment names.
paul@113	1750
paul@113	1751	if not expr and not ref and self.in_function:
paul@250	1752	locals = self.importer.function_locals.get(path)
paul@113	1753	ref = locals and locals.get(n.name)
paul@113	1754
paul@685	1755	# Find any invocation or alias details.
paul@553	1756
paul@678	1757	name = self.get_name_for_tracking(n.name, is_global=is_global)
paul@700	1758	location = not expr and self.get_access_location(name) or None
paul@553	1759
paul@670	1760	# Mark any local assignments as volatile in exception blocks.
paul@670	1761
paul@670	1762	if expr and self.in_function and not is_global and self.in_try_except:
paul@670	1763	self.make_volatile(n.name)
paul@670	1764
paul@989	1765	# Set the replacement target. Note that this will not apply to all
paul@989	1766	# objects, with only floats supporting replaceable values.
paul@989	1767
paul@989	1768	if expr:
paul@1017	1769	# Prevent parameters from becoming result targets. Otherwise, they
paul@1017	1770	# may inadvertently cause the modification of the supplied object.
paul@1017	1771
paul@1017	1772	parameters = self.importer.function_parameters.get(path)
paul@1017	1773
paul@1017	1774	if not parameters or n.name not in parameters:
paul@1017	1775	target_ref = TrResolvedNameRef(n.name, ref, is_global=is_global,
paul@1017	1776	location=location)
paul@1017	1777	self.result_target_name = str(target_ref)
paul@1017	1778	else:
paul@1017	1779	self.result_target_name = None
paul@971	1780
paul@971	1781	# Expression processing is deferred until after any result target has
paul@971	1782	# been set.
paul@971	1783
paul@971	1784	if process_expr:
paul@971	1785	expr = self.process_structure_node(expr)
paul@971	1786
paul@113	1787	# Qualified names are used for resolved static references or for
paul@113	1788	# static namespace members. The reference should be configured to return
paul@113	1789	# such names.
paul@113	1790
paul@685	1791	name_ref = TrResolvedNameRef(n.name, ref, expr=expr, is_global=is_global,
paul@686	1792	location=location)
paul@989	1793
paul@734	1794	return not expr and self.get_aliases(name_ref) or name_ref
paul@685	1795
paul@685	1796	def get_aliases(self, name_ref):
paul@685	1797
paul@685	1798	"Return alias references for the given 'name_ref'."
paul@685	1799
paul@685	1800	location = name_ref.access_location()
paul@831	1801	accessor_locations = self.deducer.access_index.get(location)
paul@831	1802
paul@831	1803	if not accessor_locations:
paul@831	1804	return None
paul@831	1805
paul@831	1806	refs = set()
paul@831	1807
paul@831	1808	for accessor_location in accessor_locations:
paul@831	1809	alias_refs = self.deducer.referenced_objects.get(accessor_location)
paul@831	1810	if alias_refs:
paul@831	1811	refs.update(alias_refs)
paul@831	1812
paul@831	1813	if refs:
paul@831	1814	return AliasResult(name_ref, refs, location)
paul@831	1815	else:
paul@831	1816	return None
paul@113	1817
paul@670	1818	def make_volatile(self, name):
paul@670	1819
paul@670	1820	"Record 'name' as volatile in the current namespace."
paul@670	1821
paul@670	1822	self.volatile_locals.add(name)
paul@670	1823
paul@113	1824	def process_not_node(self, n):
paul@113	1825
paul@113	1826	"Process the given operator node 'n'."
paul@113	1827
paul@638	1828	return self.make_negation(self.process_structure_node(n.expr))
paul@144	1829
paul@144	1830	def process_raise_node(self, n):
paul@144	1831
paul@144	1832	"Process the given raise node 'n'."
paul@144	1833
paul@144	1834	# NOTE: Determine which raise statement variants should be permitted.
paul@144	1835
paul@176	1836	if n.expr1:
paul@467	1837
paul@467	1838	# Names with accompanying arguments are treated like invocations.
paul@467	1839
paul@467	1840	if n.expr2:
paul@467	1841	call = compiler.ast.CallFunc(n.expr1, [n.expr2])
paul@467	1842	exc = self.process_structure_node(call)
paul@467	1843	self.writestmt("__Raise(%s);" % exc)
paul@317	1844
paul@317	1845	# Raise instances, testing the kind at run-time if necessary and
paul@317	1846	# instantiating any non-instance.
paul@317	1847
paul@317	1848	else:
paul@467	1849	exc = self.process_structure_node(n.expr1)
paul@467	1850
paul@979	1851	if isinstance(exc, TrInstanceRef) or exc.is_well_defined_instance():
paul@467	1852	self.writestmt("__Raise(%s);" % exc)
paul@467	1853	else:
paul@467	1854	self.writestmt("__Raise(__ensure_instance(%s));" % exc)
paul@176	1855	else:
paul@346	1856	self.writestmt("__Throw(__tmp_exc);")
paul@144	1857
paul@144	1858	def process_return_node(self, n):
paul@144	1859
paul@144	1860	"Process the given return node 'n'."
paul@144	1861
paul@971	1862	if self.in_function:
paul@971	1863	self.result_target_name = "__result"
paul@971	1864
paul@144	1865	expr = self.process_structure_node(n.value) or PredefinedConstantRef("None")
paul@971	1866
paul@189	1867	if self.in_try_finally or self.in_try_except:
paul@144	1868	self.writestmt("__Return(%s);" % expr)
paul@144	1869	else:
paul@144	1870	self.writestmt("return %s;" % expr)
paul@144	1871
paul@144	1872	return ReturnRef()
paul@113	1873
paul@113	1874	def process_try_node(self, n):
paul@113	1875
paul@113	1876	"""
paul@113	1877	Process the given "try...except" node 'n'.
paul@113	1878	"""
paul@113	1879
paul@189	1880	in_try_except = self.in_try_except
paul@189	1881	self.in_try_except = True
paul@189	1882
paul@144	1883	# Use macros to implement exception handling.
paul@113	1884
paul@144	1885	self.writestmt("__Try")
paul@113	1886	self.writeline("{")
paul@113	1887	self.indent += 1
paul@986	1888	self.process_statement_node(n.body)
paul@144	1889
paul@144	1890	# Put the else statement in another try block that handles any raised
paul@144	1891	# exceptions and converts them to exceptions that will not be handled by
paul@144	1892	# the main handling block.
paul@144	1893
paul@144	1894	if n.else_:
paul@144	1895	self.writestmt("__Try")
paul@144	1896	self.writeline("{")
paul@144	1897	self.indent += 1
paul@986	1898	self.process_statement_node(n.else_)
paul@144	1899	self.indent -= 1
paul@144	1900	self.writeline("}")
paul@144	1901	self.writeline("__Catch (__tmp_exc)")
paul@144	1902	self.writeline("{")
paul@144	1903	self.indent += 1
paul@144	1904	self.writeline("if (__tmp_exc.raising) __RaiseElse(__tmp_exc.arg);")
paul@191	1905	self.writeline("else if (__tmp_exc.completing) __Throw(__tmp_exc);")
paul@144	1906	self.indent -= 1
paul@144	1907	self.writeline("}")
paul@144	1908
paul@144	1909	# Complete the try block and enter the finally block, if appropriate.
paul@144	1910
paul@144	1911	if self.in_try_finally:
paul@144	1912	self.writestmt("__Complete;")
paul@144	1913
paul@113	1914	self.indent -= 1
paul@113	1915	self.writeline("}")
paul@113	1916
paul@189	1917	self.in_try_except = in_try_except
paul@189	1918
paul@144	1919	# Handlers are tests within a common handler block.
paul@144	1920
paul@144	1921	self.writeline("__Catch (__tmp_exc)")
paul@144	1922	self.writeline("{")
paul@144	1923	self.indent += 1
paul@144	1924
paul@189	1925	# Introduce an if statement to handle the completion of a try block.
paul@189	1926
paul@189	1927	self.process_try_completion()
paul@189	1928
paul@144	1929	# Handle exceptions in else blocks converted to __RaiseElse, converting
paul@144	1930	# them back to normal exceptions.
paul@144	1931
paul@144	1932	if n.else_:
paul@189	1933	self.writeline("else if (__tmp_exc.raising_else) __Raise(__tmp_exc.arg);")
paul@144	1934
paul@144	1935	# Exception handling.
paul@144	1936
paul@113	1937	for name, var, handler in n.handlers:
paul@144	1938
paul@144	1939	# Test for specific exceptions.
paul@144	1940
paul@113	1941	if name is not None:
paul@986	1942	name_ref = self.process_statement_node(name)
paul@462	1943	self.writeline("else if (__ISINSTANCE(__tmp_exc.arg, %s))" % name_ref)
paul@144	1944	else:
paul@189	1945	self.writeline("else if (1)")
paul@113	1946
paul@113	1947	self.writeline("{")
paul@113	1948	self.indent += 1
paul@113	1949
paul@113	1950	# Establish the local for the handler.
paul@113	1951
paul@113	1952	if var is not None:
paul@261	1953	self.writestmt("%s;" % self.process_name_node(var, make_expression("__tmp_exc.arg")))
paul@113	1954
paul@113	1955	if handler is not None:
paul@986	1956	self.process_statement_node(handler)
paul@113	1957
paul@113	1958	self.indent -= 1
paul@113	1959	self.writeline("}")
paul@113	1960
paul@144	1961	# Re-raise unhandled exceptions.
paul@144	1962
paul@189	1963	self.writeline("else __Throw(__tmp_exc);")
paul@144	1964
paul@144	1965	# End the handler block.
paul@144	1966
paul@144	1967	self.indent -= 1
paul@144	1968	self.writeline("}")
paul@634	1969	print >>self.out
paul@113	1970
paul@113	1971	def process_try_finally_node(self, n):
paul@113	1972
paul@113	1973	"""
paul@113	1974	Process the given "try...finally" node 'n'.
paul@113	1975	"""
paul@113	1976
paul@144	1977	in_try_finally = self.in_try_finally
paul@144	1978	self.in_try_finally = True
paul@113	1979
paul@144	1980	# Use macros to implement exception handling.
paul@144	1981
paul@144	1982	self.writestmt("__Try")
paul@113	1983	self.writeline("{")
paul@113	1984	self.indent += 1
paul@986	1985	self.process_statement_node(n.body)
paul@113	1986	self.indent -= 1
paul@113	1987	self.writeline("}")
paul@144	1988
paul@144	1989	self.in_try_finally = in_try_finally
paul@144	1990
paul@144	1991	# Finally clauses handle special exceptions.
paul@144	1992
paul@144	1993	self.writeline("__Catch (__tmp_exc)")
paul@113	1994	self.writeline("{")
paul@113	1995	self.indent += 1
paul@986	1996	self.process_statement_node(n.final)
paul@144	1997
paul@189	1998	# Introduce an if statement to handle the completion of a try block.
paul@189	1999
paul@189	2000	self.process_try_completion()
paul@189	2001	self.writeline("else __Throw(__tmp_exc);")
paul@189	2002
paul@189	2003	self.indent -= 1
paul@189	2004	self.writeline("}")
paul@634	2005	print >>self.out
paul@189	2006
paul@189	2007	def process_try_completion(self):
paul@189	2008
paul@189	2009	"Generate a test for the completion of a try block."
paul@144	2010
paul@144	2011	self.writestmt("if (__tmp_exc.completing)")
paul@144	2012	self.writeline("{")
paul@144	2013	self.indent += 1
paul@189	2014
paul@316	2015	# Do not return anything at the module level.
paul@316	2016
paul@316	2017	if self.get_namespace_path() != self.name:
paul@189	2018
paul@316	2019	# Only use the normal return statement if no surrounding try blocks
paul@316	2020	# apply.
paul@316	2021
paul@316	2022	if not self.in_try_finally and not self.in_try_except:
paul@316	2023	self.writeline("if (!__ISNULL(__tmp_exc.arg)) return __tmp_exc.arg;")
paul@316	2024	else:
paul@316	2025	self.writeline("if (!__ISNULL(__tmp_exc.arg)) __Throw(__tmp_exc);")
paul@144	2026
paul@113	2027	self.indent -= 1
paul@113	2028	self.writeline("}")
paul@113	2029
paul@113	2030	def process_while_node(self, n):
paul@113	2031
paul@113	2032	"Process the given while node 'n'."
paul@113	2033
paul@113	2034	self.writeline("while (1)")
paul@113	2035	self.writeline("{")
paul@113	2036	self.indent += 1
paul@986	2037	test = self.process_statement_node(n.test)
paul@113	2038
paul@113	2039	# Emit the loop termination condition unless "while <true value>" is
paul@113	2040	# indicated.
paul@113	2041
paul@113	2042	if not (isinstance(test, PredefinedConstantRef) and test.value):
paul@113	2043
paul@629	2044	# Emit a negated test of the continuation condition.
paul@629	2045
paul@638	2046	self.start_if(True, self.make_negation(test))
paul@113	2047	if n.else_:
paul@986	2048	self.process_statement_node(n.else_)
paul@128	2049	self.writestmt("break;")
paul@629	2050	self.end_if()
paul@113	2051
paul@113	2052	in_conditional = self.in_conditional
paul@113	2053	self.in_conditional = True
paul@986	2054	self.process_statement_node(n.body)
paul@113	2055	self.in_conditional = in_conditional
paul@113	2056
paul@113	2057	self.indent -= 1
paul@113	2058	self.writeline("}")
paul@634	2059	print >>self.out
paul@113	2060
paul@482	2061	# Special variable usage.
paul@482	2062
paul@637	2063	def get_temp_path(self):
paul@637	2064
paul@637	2065	"""
paul@637	2066	Return the appropriate namespace path for temporary names in the current
paul@637	2067	namespace.
paul@637	2068	"""
paul@637	2069
paul@637	2070	if self.in_function:
paul@637	2071	return self.get_namespace_path()
paul@637	2072	else:
paul@637	2073	return self.name
paul@637	2074
paul@482	2075	def record_temp(self, name):
paul@482	2076
paul@482	2077	"""
paul@482	2078	Record the use of the temporary 'name' in the current namespace. At the
paul@482	2079	class or module level, the temporary name is associated with the module,
paul@482	2080	since the variable will then be allocated in the module's own main
paul@482	2081	program.
paul@482	2082	"""
paul@482	2083
paul@637	2084	path = self.get_temp_path()
paul@637	2085
paul@637	2086	init_item(self.temp_usage, path, list)
paul@637	2087	self.temp_usage[path].append(name)
paul@637	2088
paul@637	2089	def remove_temps(self, names):
paul@637	2090
paul@637	2091	"""
paul@637	2092	Remove 'names' from temporary storage allocations, each instance
paul@637	2093	removing each request for storage.
paul@637	2094	"""
paul@637	2095
paul@637	2096	path = self.get_temp_path()
paul@637	2097
paul@637	2098	for name in names:
paul@637	2099	if self.uses_temp(path, name):
paul@637	2100	self.temp_usage[path].remove(name)
paul@482	2101
paul@482	2102	def uses_temp(self, path, name):
paul@482	2103
paul@482	2104	"""
paul@482	2105	Return whether the given namespace 'path' employs a temporary variable
paul@482	2106	with the given 'name'. Note that 'path' should only be a module or a
paul@482	2107	function or method, not a class.
paul@482	2108	"""
paul@482	2109
paul@482	2110	return self.temp_usage.has_key(path) and name in self.temp_usage[path]
paul@482	2111
paul@638	2112	def make_negation(self, expr):
paul@638	2113
paul@638	2114	"Return a negated form of 'expr'."
paul@638	2115
paul@638	2116	result = NegationResult(expr)
paul@638	2117
paul@638	2118	# Negation discards the temporary results of its operand.
paul@638	2119
paul@638	2120	temps = expr.discards_temporary()
paul@638	2121	if temps:
paul@638	2122	self.remove_temps(temps)
paul@638	2123
paul@638	2124	return result
paul@638	2125
paul@113	2126	# Output generation.
paul@113	2127
paul@128	2128	def start_output(self):
paul@159	2129
paul@159	2130	"Write the declarations at the top of each source file."
paul@159	2131
paul@128	2132	print >>self.out, """\
paul@128	2133	#include "types.h"
paul@144	2134	#include "exceptions.h"
paul@128	2135	#include "ops.h"
paul@128	2136	#include "progconsts.h"
paul@128	2137	#include "progops.h"
paul@128	2138	#include "progtypes.h"
paul@137	2139	#include "main.h"
paul@128	2140	"""
paul@128	2141
paul@482	2142	def start_unit(self):
paul@482	2143
paul@482	2144	"Record output within a generated function for later use."
paul@482	2145
paul@482	2146	self.out = StringIO()
paul@482	2147
paul@670	2148	def end_unit(self):
paul@670	2149
paul@670	2150	"Restore the output stream."
paul@482	2151
paul@482	2152	out = self.out
paul@482	2153	self.out = self.out_toplevel
paul@670	2154	return out
paul@670	2155
paul@670	2156	def flush_unit(self, name, out):
paul@670	2157
paul@670	2158	"Add declarations and generated code."
paul@482	2159
paul@482	2160	self.write_temporaries(name)
paul@634	2161	print >>self.out
paul@482	2162	out.seek(0)
paul@482	2163	self.out.write(out.read())
paul@482	2164
paul@113	2165	def start_module(self):
paul@159	2166
paul@159	2167	"Write the start of each module's main function."
paul@159	2168
paul@113	2169	print >>self.out, "void __main_%s()" % encode_path(self.name)
paul@113	2170	print >>self.out, "{"
paul@113	2171	self.indent += 1
paul@561	2172
paul@561	2173	# Define temporary variables, excluded from the module structure itself.
paul@561	2174
paul@561	2175	tempnames = []
paul@561	2176
paul@561	2177	for n in self.importer.all_module_attrs[self.name]:
paul@561	2178	if n.startswith("$t"):
paul@561	2179	tempnames.append(encode_path(n))
paul@561	2180
paul@561	2181	if tempnames:
paul@561	2182	tempnames.sort()
paul@561	2183	self.writeline("__attr %s;" % ", ".join(tempnames))
paul@561	2184
paul@482	2185	self.start_unit()
paul@113	2186
paul@113	2187	def end_module(self):
paul@159	2188
paul@159	2189	"End each module by closing its main function."
paul@159	2190
paul@670	2191	out = self.end_unit()
paul@670	2192	self.flush_unit(self.name, out)
paul@113	2193
paul@672	2194	self.indent -= 1
paul@672	2195	print >>self.out, "}"
paul@672	2196
paul@113	2197	def start_function(self, name):
paul@159	2198
paul@159	2199	"Start the function having the given 'name'."
paul@159	2200
paul@113	2201	self.indent += 1
paul@113	2202
paul@670	2203	self.start_unit()
paul@670	2204
paul@670	2205	def end_function(self, name):
paul@670	2206
paul@670	2207	"End the function having the given 'name'."
paul@670	2208
paul@670	2209	out = self.end_unit()
paul@670	2210
paul@673	2211	# Write the signature at the top indentation level.
paul@673	2212
paul@673	2213	self.indent -= 1
paul@664	2214	self.write_parameters(name)
paul@113	2215	print >>self.out, "{"
paul@113	2216
paul@113	2217	# Obtain local names from parameters.
paul@113	2218
paul@113	2219	parameters = self.importer.function_parameters[name]
paul@144	2220	locals = self.importer.function_locals[name].keys()
paul@113	2221	names = []
paul@670	2222	volatile_names = []
paul@113	2223
paul@113	2224	for n in locals:
paul@113	2225
paul@113	2226	# Filter out special names and parameters. Note that self is a local
paul@113	2227	# regardless of whether it originally appeared in the parameters or
paul@113	2228	# not.
paul@113	2229
paul@113	2230	if n.startswith("$l") or n in parameters or n == "self":
paul@113	2231	continue
paul@670	2232	if n in self.volatile_locals:
paul@976	2233	volatile_names.append("%s = __NULL" % encode_path(n))
paul@670	2234	else:
paul@976	2235	names.append("%s = __NULL" % encode_path(n))
paul@113	2236
paul@673	2237	# Emit required local names at the function indentation level.
paul@673	2238
paul@673	2239	self.indent += 1
paul@113	2240
paul@113	2241	if names:
paul@113	2242	names.sort()
paul@113	2243	self.writeline("__attr %s;" % ", ".join(names))
paul@113	2244
paul@670	2245	if volatile_names:
paul@670	2246	volatile_names.sort()
paul@670	2247	self.writeline("volatile __attr %s;" % ", ".join(volatile_names))
paul@670	2248
paul@670	2249	self.flush_unit(name, out)
paul@672	2250
paul@672	2251	self.indent -= 1
paul@672	2252	print >>self.out, "}"
paul@144	2253	print >>self.out
paul@144	2254
paul@664	2255	def write_parameters(self, name):
paul@664	2256
paul@664	2257	"""
paul@664	2258	For the function having the given 'name', write definitions of
paul@664	2259	parameters found in the arguments array.
paul@664	2260	"""
paul@664	2261
paul@664	2262	# Generate any self reference.
paul@664	2263
paul@664	2264	l = []
paul@971	2265	l.append("__attr __result")
paul@664	2266
paul@664	2267	if self.is_method(name):
paul@664	2268	l.append("__attr self")
paul@664	2269	else:
paul@664	2270	l.append("__attr __self")
paul@664	2271
paul@664	2272	# Generate aliases for the parameters.
paul@664	2273
paul@664	2274	for parameter in self.importer.function_parameters[name]:
paul@673	2275	l.append("%s__attr %s" % (
paul@673	2276	parameter in self.volatile_locals and "volatile " or "",
paul@673	2277	encode_path(parameter)))
paul@664	2278
paul@664	2279	self.writeline("__attr %s(%s)" % (
paul@664	2280	encode_function_pointer(name), ", ".join(l)))
paul@664	2281
paul@482	2282	def write_temporaries(self, name):
paul@482	2283
paul@482	2284	"Write temporary storage employed by 'name'."
paul@482	2285
paul@858	2286	# Provide space for the recorded number of temporary variables.
paul@591	2287
paul@482	2288	if self.uses_temp(name, "__tmp_targets"):
paul@858	2289	self.writeline("__attr __tmp_targets[%d];" % self.max_function_target)
paul@828	2290
paul@591	2291	if self.uses_temp(name, "__tmp_contexts"):
paul@858	2292	self.writeline("__attr __tmp_contexts[%d];" % self.max_context_index)
paul@858	2293
paul@858	2294	if self.uses_temp(name, "__tmp_values"):
paul@858	2295	self.writeline("__attr __tmp_values[%d];" % self.max_accessor_index)
paul@482	2296
paul@989	2297	if self.uses_temp(name, "__tmp_attr_refs"):
paul@989	2298	self.writeline("__attr *__tmp_attr_refs[%d];" % self.max_attribute_ref_index)
paul@482	2299
paul@971	2300	if self.uses_temp(name, "__tmp_results"):
paul@971	2301	self.writeline("__attr __tmp_results[%d] = {0};" % self.max_result_target)
paul@971	2302
paul@592	2303	if self.uses_temp(name, "__tmp_private_context"):
paul@757	2304	self.writeline("__attr __tmp_private_context;")
paul@482	2305	if self.uses_temp(name, "__tmp_target_value"):
paul@757	2306	self.writeline("__attr __tmp_target_value;")
paul@482	2307	if self.uses_temp(name, "__tmp_result"):
paul@482	2308	self.writeline("__attr __tmp_result;")
paul@479	2309
paul@479	2310	module = self.importer.get_module(self.name)
paul@482	2311
paul@482	2312	if name in module.exception_namespaces:
paul@479	2313	self.writeline("__exc __tmp_exc;")
paul@149	2314
paul@631	2315	def start_if(self, first, test_ref):
paul@629	2316	statement = "%sif" % (not first and "else " or "")
paul@629	2317
paul@629	2318	# Consume logical results directly.
paul@629	2319
paul@629	2320	if isinstance(test_ref, LogicalResult):
paul@631	2321	self.writeline("%s %s" % (statement, test_ref.apply_test()))
paul@637	2322	temps = test_ref.discards_temporary()
paul@637	2323	if temps:
paul@637	2324	self.remove_temps(temps)
paul@629	2325	else:
paul@631	2326	self.writeline("%s (__BOOL(%s))" % (statement, test_ref))
paul@629	2327
paul@113	2328	self.writeline("{")
paul@113	2329	self.indent += 1
paul@113	2330
paul@113	2331	def end_if(self):
paul@113	2332	self.indent -= 1
paul@113	2333	self.writeline("}")
paul@113	2334
paul@113	2335	def start_else(self):
paul@113	2336	self.writeline("else")
paul@113	2337	self.writeline("{")
paul@113	2338	self.indent += 1
paul@113	2339
paul@113	2340	def end_else(self):
paul@113	2341	self.indent -= 1
paul@113	2342	self.writeline("}")
paul@113	2343
paul@113	2344	def statement(self, expr):
paul@113	2345	s = str(expr)
paul@113	2346	if s:
paul@128	2347	self.writestmt("%s;" % s)
paul@113	2348
paul@113	2349	def statements(self, results):
paul@113	2350	for result in results:
paul@113	2351	self.statement(result)
paul@113	2352
paul@159	2353	def writeline(self, s):
paul@159	2354	print >>self.out, "%s%s" % (self.pad(), self.indenttext(s, self.indent + 1))
paul@159	2355
paul@159	2356	def writestmt(self, s):
paul@159	2357	self.writeline(s)
paul@159	2358
paul@159	2359	def write_comment(self, s):
paul@159	2360	self.writestmt("/* %s */" % s)
paul@159	2361
paul@113	2362	def pad(self, extra=0):
paul@113	2363	return (self.indent + extra) * self.tabstop
paul@113	2364
paul@113	2365	def indenttext(self, s, levels):
paul@116	2366	lines = s.split("\n")
paul@116	2367	out = [lines[0]]
paul@116	2368	for line in lines[1:]:
paul@116	2369	out.append(levels * self.tabstop + line)
paul@116	2370	if line.endswith("("):
paul@116	2371	levels += 1
paul@122	2372	elif line.startswith(")"):
paul@116	2373	levels -= 1
paul@116	2374	return "\n".join(out)
paul@113	2375
paul@113	2376	# vim: tabstop=4 expandtab shiftwidth=4