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chaispeed.py
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chaispeed.py
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# chaispeed.py
import logging
from collections import defaultdict
from scope.chaivars import *
from scope.chaiflow import *
class ChaiSpeed:
def __init__(self, global_variables, memory_indexes, next_free_memory_index):
self.global_variables = global_variables
self.memory_indexes = memory_indexes
self.next_free_memory_index = next_free_memory_index
def get_object_from_memory(self, pidentifier):
"""
Returns the object from memory
:param pidentifier: object identifier
:return: object
"""
return self.global_variables[pidentifier]
def count_occurences(self, parse_tree):
"""
Counts the number of occurences of variables.
:return:
"""
occurences = defaultdict(int)
for operation in parse_tree:
if isinstance(operation, Read):
occurences[operation.to_variable.pidentifier] += 1
elif isinstance(operation, Write):
if isinstance(operation.from_variable, Int):
occurences[operation.from_variable.pidentifier] += 1
elif isinstance(operation.from_variable, IntArrayElement):
occurences[operation.from_variable.array.pidentifier] += 1
if isinstance(operation.from_variable.value_holder, Int):
occurences[operation.from_variable.value_holder.pidentifier] += 1
elif isinstance(operation, Assign):
occurences[operation.identifier.pidentifier] += 1
if isinstance(operation.expression, Value):
if isinstance(operation.expression.a, Int):
occurences[operation.expression.a.pidentifier] += 1
elif isinstance(operation.expression.a, IntArrayElement):
occurences[operation.expression.a.array.pidentifier] += 1
if isinstance(operation.expression.a.value_holder, Int):
occurences[operation.expression.a.value_holder.pidentifier] += 1
elif isinstance(operation.expression, Operation):
if isinstance(operation.expression.a, Int):
occurences[operation.expression.a.pidentifier] += 1
elif isinstance(operation.expression.a, IntArrayElement):
occurences[operation.expression.a.array.pidentifier] += 1
if isinstance(operation.expression.a.value_holder, Int):
occurences[operation.expression.a.value_holder.pidentifier] += 1
if isinstance(operation.expression.b, Int):
occurences[operation.expression.b.pidentifier] += 1
elif isinstance(operation.expression.b, IntArrayElement):
occurences[operation.expression.b.array.pidentifier] += 1
if isinstance(operation.expression.b.value_holder, Int):
occurences[operation.expression.b.value_holder.pidentifier] += 1
elif isinstance(operation, (While, DoWhile, If, IfElse)):
bounty = 1
if isinstance(operation, (While, DoWhile)):
bounty = 500
if isinstance(operation.condition.p, Int):
occurences[operation.condition.p.pidentifier] += bounty
elif isinstance(operation.condition.p, IntArrayElement):
occurences[operation.condition.p.array.pidentifier] += bounty
if isinstance(operation.condition.p.value_holder, Int):
occurences[operation.condition.p.value_holder.pidentifier] += bounty
if isinstance(operation.condition.q, Int):
occurences[operation.condition.q.pidentifier] += bounty
elif isinstance(operation.condition.q, IntArrayElement):
occurences[operation.condition.q.array.pidentifier] += bounty
if isinstance(operation.condition.q.value_holder, Int):
occurences[operation.condition.q.value_holder.pidentifier] += bounty
internal_occurences = self.count_occurences(parse_tree=operation.commands)
for key, value in internal_occurences.items():
val = value
if isinstance(operation, (While, DoWhile)):
val = value * 20 # weight of loop
occurences[key] += val
if isinstance(operation, IfElse):
else_occurences = self.count_occurences(parse_tree=operation.alt_commands)
for key, value in else_occurences.items():
occurences[key] += value
elif isinstance(operation, (For, ForDownTo)):
# Iterator has the highest possible priority
occurences[operation.pidentifier.pidentifier] += 500
if isinstance(operation.from_val, Int):
occurences[operation.from_val.pidentifier] += 20
elif isinstance(operation.from_val, IntArrayElement):
occurences[operation.from_val.array.pidentifier] += 20
if isinstance(operation.from_val.value_holder, Int):
occurences[operation.from_val.value_holder.pidentifier] += 20
if isinstance(operation.to_val, Int):
occurences[operation.to_val.pidentifier] += 20
elif isinstance(operation.to_val, IntArrayElement):
occurences[operation.to_val.array.pidentifier] += 20
if isinstance(operation.to_val.value_holder, Int):
occurences[operation.to_val.value_holder.pidentifier] += 20
internal_occurences = self.count_occurences(parse_tree=operation.commands)
for key, value in internal_occurences.items():
occurences[key] += value * 20
return occurences
def rearrange_allocations(self, occurences):
"""
Changes the allocated memory block for declared variables given their occurences
:param occurences: defaultdict of occurences
:param self:
:return:
"""
current_globs = self.global_variables.copy()
current_mems = self.memory_indexes.copy()
logging.basicConfig(level=logging.CRITICAL)
logging.debug("Current globs: {}, current mems: {}".format(current_globs, current_mems))
logging.debug("Passed occurences: {}".format(occurences))
global_vars = {}
mem_indexes = {}
next_free_mem_index = 0
for pidentifier, value in sorted(occurences.items(), key=operator.itemgetter(1), reverse=True):
logging.debug("Pidentifier, value: ({}, {})".format(pidentifier, value))
if pidentifier in self.global_variables.keys() and pidentifier in self.memory_indexes.keys():
object = self.get_object_from_memory(pidentifier=pidentifier)
global_vars[pidentifier] = object
mem_indexes[pidentifier] = next_free_mem_index
if isinstance(object, Int):
if object.get_is_iterator():
global_vars[pidentifier].set_as_iterator()
# Declare iterator helpers here!
lbound = Int(pidentifier='for_lbound_{}'.format(object.pidentifier),
lineno=object.lineno)
lbound.set_value_has_been_set()
lbound.set_as_iterator()
ubound = Int(pidentifier='for_ubound_{}'.format(object.pidentifier),
lineno=object.lineno)
ubound.set_value_has_been_set()
ubound.set_as_iterator()
# Declare ubound, lbound
global_vars[lbound.pidentifier] = lbound
global_vars[ubound.pidentifier] = ubound
mem_indexes[lbound.pidentifier] = next_free_mem_index + 1
mem_indexes[ubound.pidentifier] = next_free_mem_index + 2
next_free_mem_index += 2
next_free_mem_index += 1
elif isinstance(object, IntArray):
next_free_mem_index += object.length
# Remove object
del self.memory_indexes[pidentifier]
del self.global_variables[pidentifier]
# if len(self.global_variables) > 0 or len(self.memory_indexes) > 0:
# # Panic mode
# logging.debug("Panic mode for rearranging vars. Globs contents: {}, indexes: {}".format(
# self.global_variables, self.memory_indexes))
# self.global_variables = current_globs
# self.memory_indexes = current_mems
# else:
# All is fine, so make the change!
# logging.debug("Making change to memory!")
logging.debug("Global vars: {}, mem_indexes: {} after all of that fun".format(global_vars, mem_indexes))
self.global_variables = global_vars
self.memory_indexes = mem_indexes
self.next_free_memory_index
def optimize_memory_allocations(self, parse_tree):
"""
Performs the optimizations of memory allocations.
:return:
"""
occurences = self.count_occurences(parse_tree=parse_tree)
self.rearrange_allocations(occurences=occurences)