def __init__ (self, varalloc, validate=False):
P0Flattener.__init__(self, varalloc)
self.validate = validate
def flatten (self, node):
"""Takes an AST as input, and then "flattens" the tree into a list of statements."""
if isinstance(node, (Or,And)):
# we only need to handle two operands to the "or" operator
if self.validate and len(node.nodes) > 2:
raise Exception("Only two operands supported in P1 for 'or' operator")
lhsvar, lhsstmtlist = self.flatten(node.nodes[0])
rhsvar, rhsstmtlist = self.flatten(node.nodes[1])
varname = self.varalloc.get_next_var()
result = Or([lhsvar,rhsvar]) if isinstance(node,Or) else And([lhsvar,rhsvar])
return (Name(varname), lhsstmtlist + rhsstmtlist + [Assign([AssName(varname, 'OP_ASSIGN')], result)])
elif isinstance(node, Let):
# first, flatten rhs
(rhsvar, rhsstmtlist) = self.flatten(node.rhs)
# now make sure that the variable specified by Let is assigned the result
letassignstmt = [Assign([AssName(node.var.name, 'OP_ASSIGN')], rhsvar)]
# now flatten the body and return
# NOTE: there should not be ANY Let nodes after a flatten
(bodyvar, bodystmtlist) = self.flatten(node.body)
return (bodyvar, rhsstmtlist + letassignstmt + bodystmtlist)
elif isinstance(node, (ProjectTo,InjectFrom)):
(var, stmtlist) = self.flatten(node.arg)
varname = self.varalloc.get_next_var()
result = ProjectTo(node.typ, var) if isinstance(node,ProjectTo) else InjectFrom(node.typ, var)
return (Name(varname), stmtlist + [Assign([AssName(varname,'OP_ASSIGN')], result)])
elif isinstance(node, GetTag):
(var, stmtlist) = self.flatten(node.arg)
varname = self.varalloc.get_next_var()
return (Name(varname), stmtlist + [Assign([AssName(varname,'OP_ASSIGN')], GetTag(var))])
elif isinstance(node, List):
stmts = [self.flatten(x) for x in node.nodes]
varlist = [x for x,y in stmts]
# convert the list of lists into a single list of statements
stmtlist = reduce(lambda x,y: x+y, [y for x,y in stmts if y != []], [])
varname = self.varalloc.get_next_var()
return (Name(varname), stmtlist + [Assign([AssName(varname, 'OP_ASSIGN')], List(varlist))])
elif isinstance(node, Dict):
keys = [self.flatten(x[0]) for x in node.items]
keyvarlist = [x for x,y in keys]
keystmtlist = reduce(lambda x,y: x+y, [y for x,y in keys if y != []], [])
values = [self.flatten(x[1]) for x in node.items]
valuevarlist = [x for x,y in values]
valuestmtlist = reduce(lambda x,y: x+y, [y for x,y in values if y != []], [])
# keyvaluelist becomes a list of tuples, where each tuple is a key,value corresponding to the
# temp variables for the key/value
keyvaluelist = map(lambda x: (keyvarlist[x],valuevarlist[x]), range(0,len(keyvarlist)))
varname = self.varalloc.get_next_var()
return (Name(varname), keystmtlist + valuestmtlist + [Assign([AssName(varname, 'OP_ASSIGN')], Dict(keyvaluelist))])
elif isinstance(node, IfExp):
# Go ahead and flatten all expressions, including the test expression, as well as the
# "then" and "else" expressions.
vartes, test = self.flatten(node.test)
vart, then = self.flatten(node.then)
vare, else_ = self.flatten(node.else_)
# Allocate a variable name, which will hold the result of the IfExp
varname = self.varalloc.get_next_var()
#test = [Assign([AssName(vartes, 'OP_ASSIGN')], varname)]+test1
# update the "then" and "else_" set of statements to include an
# assignment to the allocated variable
then = then + [Assign([AssName(varname, 'OP_ASSIGN')], vart)]
else_ = else_ + [Assign([AssName(varname, 'OP_ASSIGN')], vare)]
# We don't want to blindly execute both branches of the if, so instead we
# encapsulate the flattened statements for the "then" and "else_" clauses in an If node.
# The If node is then returned as a statement. This is expanded later into labels and
# jumps. The test expression is always evaluated, so we have to include the corresponding
# flattened statements.
# NOTE: The If node has two attributes: "tests" and "else_". The tests attribute is
# a list of tuples, where the first element in the tuple is the test expression and the
# second element in the tuple is a Stmt object. Each tuple in the list corresponds to
# an "if" or "elif" clause. The else_ attribute is a Stmt object corresponding to the
# "else" clause.
return (Name(varname), test + [If([(vartes, Stmt(then))], Stmt(else_))])
elif isinstance(node, Not):
var, stmtlist = self.flatten(node.expr)
tempvar = self.varalloc.get_next_var()
return (Name(tempvar), stmtlist + [Assign([AssName(tempvar,'OP_ASSIGN')], var), Not(Name(tempvar))])
elif isinstance(node, Compare):
# Only need to handle binary comparison operators. So if len(node.ops) > 1, its a syntax error.
# For example, a == b == c is valid python, but invalid P1
if self.validate and len(node.ops) > 1:
raise Exception('Only two operands supported in P1 for comparison operators')
if self.validate and node.ops[0][0] not in ['==','!=','is']:
raise Exception("'%s' is not a valid comparison operator in P1" % node.ops[0][0])
lhsvar, lhsstmtlist = self.flatten(node.expr)
oper, rhs = node.ops[0]
rhsvar, rhsstmtlist = self.flatten(rhs)
varname = self.varalloc.get_next_var()
return (Name(varname), lhsstmtlist + rhsstmtlist + [Assign([AssName(varname,'OP_ASSIGN')], Compare(lhsvar, [(oper, rhsvar)]))])
# overridden from p0flattener.py to handle arguments
elif isinstance(node, CallFunc):
# arguments can be arbitrary expressions, so we need to flatten those too.
# this is a list of tuples: [(var1,stmtlist1), (var2,stmtlist2), ...]
varstmtlist = [self.flatten(x) for x in node.args]
#print varstmtlist
# generate a temporary to store the result
varname = self.varalloc.get_next_var()
# convert the list of tuples to just a list of the variables; ditto for statements
varlist = [x[0] for x in varstmtlist]
#print varlist
stmtlist = reduce(lambda x,y: x+y, [x[1] for x in varstmtlist], [])
#print stmtlist
# return a CallFunc with the variables substituted in
return (Name(varname), stmtlist + [Assign([AssName(varname, 'OP_ASSIGN')], CallFunc(node.node, varlist))])
elif isinstance(node, Subscript):
# We only need to handle one subscript per the grammar, e.g, a[1,2] is invalid P1
# (a[1,2] is the only case where you get len(node.subs) > 1)
if self.validate and len(node.subs) > 1:
raise Exception('Only one subscript index supported in P1')
exprvar, exprstmtlist = self.flatten(node.expr)
subvar, substmtlist = self.flatten(node.subs[0])
varname = self.varalloc.get_next_var()
return (Name(varname), exprstmtlist + substmtlist + [Assign([AssName(varname,'OP_ASSIGN')], Subscript(exprvar, node.flags, subvar))])
else:
return P0Flattener.flatten(self, node)
def __init__(self, varalloc, validate=False):
P0Flattener.__init__(self, varalloc)
self.validate = validate
def flatten(self, node):
"""Takes an AST as input, and then "flattens" the tree into a list of statements."""
if isinstance(node, (Or, And)):
# we only need to handle two operands to the "or" operator
if self.validate and len(node.nodes) > 2:
raise Exception(
"Only two operands supported in P1 for 'or' operator")
lhsvar, lhsstmtlist = self.flatten(node.nodes[0])
rhsvar, rhsstmtlist = self.flatten(node.nodes[1])
varname = self.varalloc.get_next_var()
result = Or([lhsvar, rhsvar]) if isinstance(node, Or) else And(
[lhsvar, rhsvar])
return (Name(varname), lhsstmtlist + rhsstmtlist +
[Assign([AssName(varname, 'OP_ASSIGN')], result)])
elif isinstance(node, Let):
# first, flatten rhs
(rhsvar, rhsstmtlist) = self.flatten(node.rhs)
# now make sure that the variable specified by Let is assigned the result
letassignstmt = [
Assign([AssName(node.var.name, 'OP_ASSIGN')], rhsvar)
]
# now flatten the body and return
# NOTE: there should not be ANY Let nodes after a flatten
(bodyvar, bodystmtlist) = self.flatten(node.body)
return (bodyvar, rhsstmtlist + letassignstmt + bodystmtlist)
elif isinstance(node, (ProjectTo, InjectFrom)):
(var, stmtlist) = self.flatten(node.arg)
varname = self.varalloc.get_next_var()
result = ProjectTo(node.typ, var) if isinstance(
node, ProjectTo) else InjectFrom(node.typ, var)
return (Name(varname), stmtlist +
[Assign([AssName(varname, 'OP_ASSIGN')], result)])
elif isinstance(node, GetTag):
(var, stmtlist) = self.flatten(node.arg)
varname = self.varalloc.get_next_var()
return (Name(varname), stmtlist +
[Assign([AssName(varname, 'OP_ASSIGN')], GetTag(var))])
elif isinstance(node, List):
stmts = [self.flatten(x) for x in node.nodes]
varlist = [x for x, y in stmts]
# convert the list of lists into a single list of statements
stmtlist = reduce(lambda x, y: x + y,
[y for x, y in stmts if y != []], [])
varname = self.varalloc.get_next_var()
return (Name(varname), stmtlist +
[Assign([AssName(varname, 'OP_ASSIGN')], List(varlist))])
elif isinstance(node, Dict):
keys = [self.flatten(x[0]) for x in node.items]
keyvarlist = [x for x, y in keys]
keystmtlist = reduce(lambda x, y: x + y,
[y for x, y in keys if y != []], [])
values = [self.flatten(x[1]) for x in node.items]
valuevarlist = [x for x, y in values]
valuestmtlist = reduce(lambda x, y: x + y,
[y for x, y in values if y != []], [])
# keyvaluelist becomes a list of tuples, where each tuple is a key,value corresponding to the
# temp variables for the key/value
keyvaluelist = map(lambda x: (keyvarlist[x], valuevarlist[x]),
range(0, len(keyvarlist)))
varname = self.varalloc.get_next_var()
return (
Name(varname), keystmtlist + valuestmtlist +
[Assign([AssName(varname, 'OP_ASSIGN')], Dict(keyvaluelist))])
elif isinstance(node, IfExp):
# Go ahead and flatten all expressions, including the test expression, as well as the
# "then" and "else" expressions.
vartes, test = self.flatten(node.test)
vart, then = self.flatten(node.then)
vare, else_ = self.flatten(node.else_)
# Allocate a variable name, which will hold the result of the IfExp
varname = self.varalloc.get_next_var()
#test = [Assign([AssName(vartes, 'OP_ASSIGN')], varname)]+test1
# update the "then" and "else_" set of statements to include an
# assignment to the allocated variable
then = then + [Assign([AssName(varname, 'OP_ASSIGN')], vart)]
else_ = else_ + [Assign([AssName(varname, 'OP_ASSIGN')], vare)]
# We don't want to blindly execute both branches of the if, so instead we
# encapsulate the flattened statements for the "then" and "else_" clauses in an If node.
# The If node is then returned as a statement. This is expanded later into labels and
# jumps. The test expression is always evaluated, so we have to include the corresponding
# flattened statements.
# NOTE: The If node has two attributes: "tests" and "else_". The tests attribute is
# a list of tuples, where the first element in the tuple is the test expression and the
# second element in the tuple is a Stmt object. Each tuple in the list corresponds to
# an "if" or "elif" clause. The else_ attribute is a Stmt object corresponding to the
# "else" clause.
return (Name(varname),
test + [If([(vartes, Stmt(then))], Stmt(else_))])
elif isinstance(node, Not):
var, stmtlist = self.flatten(node.expr)
tempvar = self.varalloc.get_next_var()
return (Name(tempvar), stmtlist + [
Assign([AssName(tempvar, 'OP_ASSIGN')], var),
Not(Name(tempvar))
])
elif isinstance(node, Compare):
# Only need to handle binary comparison operators. So if len(node.ops) > 1, its a syntax error.
# For example, a == b == c is valid python, but invalid P1
if self.validate and len(node.ops) > 1:
raise Exception(
'Only two operands supported in P1 for comparison operators'
)
if self.validate and node.ops[0][0] not in ['==', '!=', 'is']:
raise Exception(
"'%s' is not a valid comparison operator in P1" %
node.ops[0][0])
lhsvar, lhsstmtlist = self.flatten(node.expr)
oper, rhs = node.ops[0]
rhsvar, rhsstmtlist = self.flatten(rhs)
varname = self.varalloc.get_next_var()
return (Name(varname), lhsstmtlist + rhsstmtlist + [
Assign([AssName(varname, 'OP_ASSIGN')],
Compare(lhsvar, [(oper, rhsvar)]))
])
# overridden from p0flattener.py to handle arguments
elif isinstance(node, CallFunc):
# arguments can be arbitrary expressions, so we need to flatten those too.
# this is a list of tuples: [(var1,stmtlist1), (var2,stmtlist2), ...]
varstmtlist = [self.flatten(x) for x in node.args]
#print varstmtlist
# generate a temporary to store the result
varname = self.varalloc.get_next_var()
# convert the list of tuples to just a list of the variables; ditto for statements
varlist = [x[0] for x in varstmtlist]
#print varlist
stmtlist = reduce(lambda x, y: x + y, [x[1] for x in varstmtlist],
[])
#print stmtlist
# return a CallFunc with the variables substituted in
return (Name(varname), stmtlist + [
Assign([AssName(varname, 'OP_ASSIGN')],
CallFunc(node.node, varlist))
])
elif isinstance(node, Subscript):
# We only need to handle one subscript per the grammar, e.g, a[1,2] is invalid P1
# (a[1,2] is the only case where you get len(node.subs) > 1)
if self.validate and len(node.subs) > 1:
raise Exception('Only one subscript index supported in P1')
exprvar, exprstmtlist = self.flatten(node.expr)
subvar, substmtlist = self.flatten(node.subs[0])
varname = self.varalloc.get_next_var()
return (Name(varname), exprstmtlist + substmtlist + [
Assign([AssName(varname, 'OP_ASSIGN')],
Subscript(exprvar, node.flags, subvar))
])
else:
return P0Flattener.flatten(self, node)
from comp_util import *
from p0parser import P0Parser
from p0flattener import P0Flattener
from p0insselector import P0InstructionSelector
if len(sys.argv) < 2:
sys.exit(1)
# configure logging
logging.config.fileConfig('logging.cfg')
testcases = sys.argv[1:]
for testcase in testcases:
parser = P0Parser()
parser.build()
#ast = compiler.parseFile(testcase)
ast = parser.parseFile(testcase)
varalloc = VariableAllocator()
p0flattener = P0Flattener(varalloc)
stmtlist = p0flattener.flatten(ast)
instruction_selector = P0InstructionSelector(varalloc)
program = instruction_selector.visit(stmtlist)
regallocator = P0RegAllocator(program, varalloc)
print regallocator.substitute()
#import cProfile as profile
#import pstats
#output_file = 'profile.out'
#profile.run('regallocator.substitute()', output_file)
#p = pstats.Stats(output_file)
#print "name: "
#print p.sort_stats('name')
#print "all stats: "
#p.print_stats()
#print "cumulative (top 10): "
