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# -*- coding: utf-8 -*-
#
# AWL simulator - L-stack handling
#
# Copyright 2014-2018 Michael Buesch <m@bues.ch>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License along
# with this program; if not, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
#
from __future__ import division, absolute_import, print_function, unicode_literals
#from awlsim.common.cython_support cimport * #@cy
from awlsim.common.compat import *
from awlsim.common.exceptions import *
from awlsim.common.datatypehelpers import * #+cimport
from awlsim.common.util import *
from awlsim.core.datatypes import *
from awlsim.core.memory import * #+cimport
from awlsim.core.offset import * #+cimport
#from cpython.mem cimport PyMem_Malloc, PyMem_Free #@cy
class LStackFrame(object): #@nocy
offset = None #@nocy
allocBits = 0 #@nocy
prevFrame = None #@nocy
class LStackAllocator(object): #+cdef
"""Memory allocator for the L-stack.
This class manages the L-stack of one OB instance.
"""
__frameFreeSet = set() #@nocy
#@cy def __dealloc__(self):
#@cy cdef LStackFrame *frame
#@cy cdef LStackFrame *oldFrame
#@cy frame = self.topFrame
#@cy while frame:
#@cy oldFrame = frame
#@cy frame = frame.prevFrame
#@cy PyMem_Free(oldFrame)
def __init__(self, maxSize): #@nocy
#@cy def __init__(self, uint32_t maxSize):
# maxSize -> max size of the L-stack, in bytes.
self.topFrame = None #+NoneToNULL
self.resize(maxSize)
# Reset all allocations on the L-stack.
# Sets the maximum possible allocation to maxAllocBytes.
# maxAllocBytes must be smaller or equal to self.memory size.
def resize(self, maxAllocBytes): #@nocy
#@cy cdef resize(self, uint32_t maxAllocBytes):
self.memory = AwlMemory(maxAllocBytes)
self.maxAllocBits = maxAllocBytes * 8
def reset(self): #+cdef
#@cy cdef LStackFrame *frame
#@cy cdef LStackFrame *oldFrame
self.globAllocBits = 0
frame = self.topFrame
while frame:
oldFrame = frame
self.topFrame = frame = frame.prevFrame
oldFrame.prevFrame = None #+NoneToNULL
self.__frameFreeSet.add(oldFrame) #@nocy
#@cy PyMem_Free(oldFrame)
def enterStackFrame(self): #+cdef
#@cy cdef LStackFrame *frame
#@cy cdef uint32_t globAllocBits
prevAllocBits = self.globAllocBits
self.globAllocBits = globAllocBits = (((prevAllocBits + 7) >> 3) << 3)
globAllocBytes = globAllocBits // 8
# Allocate a new stack frame.
try: #@nocy
frame = self.__frameFreeSet.pop() #@nocy
except KeyError: #@nocy
frame = LStackFrame() #@nocy
#@cy frame = <LStackFrame *>PyMem_Malloc(sizeof(LStackFrame))
#@cy if frame == NULL:
#@cy raise AwlSimError("enterStackFrame: Out of memory")
frame.byteOffset = globAllocBytes
# Account the rounded-up bits to the new frame.
frame.allocBits = globAllocBits - prevAllocBits
frame.prevFrame = self.topFrame
self.topFrame = frame
self.topFrameOffset = make_AwlOffset(globAllocBytes, 0)
def exitStackFrame(self): #+cdef
#@cy cdef LStackFrame *frame
#@cy cdef LStackFrame *topFrame
frame = self.topFrame
topFrame = self.topFrame = frame.prevFrame
self.globAllocBits = globAllocBits = self.globAllocBits - frame.allocBits
if topFrame:
self.topFrameOffset = make_AwlOffset_fromLongBitOffset(
globAllocBits - topFrame.allocBits)
else:
self.topFrameOffset = make_AwlOffset(0, 0)
frame.prevFrame = None #+NoneToNULL
self.__frameFreeSet.add(frame) #@nocy
#@cy PyMem_Free(frame)
# Allocate a number of bits on the L-stack.
# Returns an AwlOffset as the offset the bits are allocated on.
def alloc(self, nrBits): #@nocy
#@cy cdef AwlOffset alloc(self, uint32_t nrBits):
#@cy cdef LStackFrame *frame
#@cy cdef uint32_t globAllocBits
#@cy cdef uint32_t roundBits
#@cy cdef AwlOffset offset
frame = self.topFrame
globAllocBits = self.globAllocBits
# Calculate the number of bits to actually allocate and
# calculate the AwlOffset to this allocation.
roundBits = 0
if nrBits == 1:
# Bit-aligned allocation
offset = make_AwlOffset(globAllocBits // 8 - frame.byteOffset,
globAllocBits % 8)
else:
# Byte-aligned allocation
if globAllocBits & 7:
# Round up to the next byte boundary.
roundBits = 8 - (globAllocBits & 7)
globAllocBits += roundBits
offset = make_AwlOffset(globAllocBits // 8 - frame.byteOffset,
0)
globAllocBits += nrBits
if (((globAllocBits + 7) >> 3) << 3) >= self.maxAllocBits:
raise AwlSimError(
"Cannot allocate another %d+%d bits on the L-stack. "
"The L-stack is exhausted. Maximum size = %d bits." % (
nrBits, roundBits, self.maxAllocBits))
# Actually allocate the bits.
self.globAllocBits = globAllocBits
frame.allocBits += nrBits + roundBits
return offset
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