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#
# AWL simulator - Operator translator
# Copyright 2012 Michael Buesch <m@bues.ch>
#
# Licensed under the terms of the GNU General Public License version 2.
#
from util import *
from awloperators import *
from awlparser import *
from awltimers import *
class OpDescriptor(object):
"Instruction operator descriptor"
def __init__(self, operType, width, offset, bitOffset, fieldCount):
self.operType = operType
self.width = width
self.offset = offset
self.bitOffset = bitOffset
self.fieldCount = fieldCount
def dup(self):
return OpDescriptor(self.operType, self.width, self.offset,
self.bitOffset, self.fieldCount)
class AwlOpTranslator(object):
"Instruction operator translator"
constOperTab = {
"==0" : OpDescriptor(AwlOperator.MEM_STW_Z, 1, 0, 0, 1),
"<>0" : OpDescriptor(AwlOperator.MEM_STW_NZ, 1, 0, 0, 1),
">0" : OpDescriptor(AwlOperator.MEM_STW_POS, 1, 0, 0, 1),
"<0" : OpDescriptor(AwlOperator.MEM_STW_NEG, 1, 0, 0, 1),
">=0" : OpDescriptor(AwlOperator.MEM_STW_POSZ, 1, 0, 0, 1),
"<=0" : OpDescriptor(AwlOperator.MEM_STW_NEGZ, 1, 0, 0, 1),
"OV" : OpDescriptor(AwlOperator.MEM_STW, 1, 0, 5, 1),
"OS" : OpDescriptor(AwlOperator.MEM_STW, 1, 0, 4, 1),
"UO" : OpDescriptor(AwlOperator.MEM_STW_UO, 1, 0, 0, 1),
"BIE" : OpDescriptor(AwlOperator.MEM_STW, 1, 0, 8, 1),
"E" : OpDescriptor(AwlOperator.MEM_E, 1, -1, -1, 2),
"EB" : OpDescriptor(AwlOperator.MEM_E, 8, -1, 0, 2),
"EW" : OpDescriptor(AwlOperator.MEM_E, 16, -1, 0, 2),
"ED" : OpDescriptor(AwlOperator.MEM_E, 32, -1, 0, 2),
"A" : OpDescriptor(AwlOperator.MEM_A, 1, -1, -1, 2),
"AB" : OpDescriptor(AwlOperator.MEM_A, 8, -1, 0, 2),
"AW" : OpDescriptor(AwlOperator.MEM_A, 16, -1, 0, 2),
"AD" : OpDescriptor(AwlOperator.MEM_A, 32, -1, 0, 2),
"L" : OpDescriptor(AwlOperator.MEM_L, 1, -1, -1, 2),
"LB" : OpDescriptor(AwlOperator.MEM_L, 8, -1, 0, 2),
"LW" : OpDescriptor(AwlOperator.MEM_L, 16, -1, 0, 2),
"LD" : OpDescriptor(AwlOperator.MEM_L, 32, -1, 0, 2),
"M" : OpDescriptor(AwlOperator.MEM_M, 1, -1, -1, 2),
"MB" : OpDescriptor(AwlOperator.MEM_M, 8, -1, 0, 2),
"MW" : OpDescriptor(AwlOperator.MEM_M, 16, -1, 0, 2),
"MD" : OpDescriptor(AwlOperator.MEM_M, 32, -1, 0, 2),
"T" : OpDescriptor(AwlOperator.MEM_T, 16, -1, 0, 2),
"Z" : OpDescriptor(AwlOperator.MEM_Z, 16, -1, 0, 2),
"FC" : OpDescriptor(AwlOperator.BLKREF_FC, 16, -1, 0, 2),
"SFC" : OpDescriptor(AwlOperator.BLKREF_SFC, 16, -1, 0, 2),
"FB" : OpDescriptor(AwlOperator.BLKREF_FB, 16, -1, 0, 2),
"SFB" : OpDescriptor(AwlOperator.BLKREF_SFB, 16, -1, 0, 2),
"DB" : OpDescriptor(AwlOperator.BLKREF_DB, 16, -1, 0, 2),
#TODO DIx
#TODO PEx
#TODO PAx
"__STW" : OpDescriptor(AwlOperator.MEM_STW, 1, 0, -1, 2),
"__ACCU" : OpDescriptor(AwlOperator.VIRT_ACCU, 32, -1, 0, 2),
"__AR" : OpDescriptor(AwlOperator.VIRT_AR, 32, -1, 0, 2),
}
@classmethod
def op2desc(cls, rawOp):
try:
#FIXME might match on label
return cls.constOperTab[rawOp].dup()
except KeyError as e:
pass
try:
immediate = int(rawOp, 10)
#FIXME 32bit? 16bit?
return OpDescriptor(AwlOperator.IMM, 32, immediate, 0, 1)
except ValueError as e:
pass
rawOpUpper = rawOp.upper()
if rawOpUpper.startswith("S5T#"):
p = rawOpUpper[4:]
seconds = 0.0
while p:
if p.endswith("MS"):
mult = 0.001
p = p[:-2]
elif p.endswith("S"):
mult = 1.0
p = p[:-1]
elif p.endswith("M"):
mult = 60.0
p = p[:-1]
elif p.endswith("H"):
mult = 3600.0
p = p[:-1]
else:
raise AwlSimError("Invalid time")
if not p:
raise AwlSimError("Invalid time")
num = ""
while p and p[-1] in "0123456789":
num = p[-1] + num
p = p[:-1]
if not num:
raise AwlSimError("Invalid time")
num = int(num, 10)
seconds += num * mult
s5t = Timer.seconds_to_s5t(seconds)
return OpDescriptor(AwlOperator.IMM_S5T, 0, s5t, 0, 1)
if rawOpUpper.startswith("B#16#"):
try:
immediate = int(rawOpUpper[5:], 16)
if immediate > 0xFF:
raise ValueError
except ValueError as e:
raise AwlSimError("Invalid immediate")
return OpDescriptor(AwlOperator.IMM, 8, immediate, 0, 1)
if rawOpUpper.startswith("W#16#"):
try:
immediate = int(rawOpUpper[5:], 16)
if immediate > 0xFFFF:
raise ValueError
except ValueError as e:
raise AwlSimError("Invalid immediate")
return OpDescriptor(AwlOperator.IMM, 16, immediate, 0, 1)
if rawOpUpper.startswith("DW#16#"):
try:
immediate = int(rawOpUpper[6:], 16)
if immediate > 0xFFFFFFFF:
raise ValueError
except ValueError as e:
raise AwlSimError("Invalid immediate")
return OpDescriptor(AwlOperator.IMM, 32, immediate, 0, 1)
if rawOpUpper.startswith("C#"):
try:
cnt = rawOpUpper[2:]
if len(cnt) < 1 or len(cnt) > 3:
raise ValueError
a, b, c = 0, 0, 0
if cnt:
a = int(cnt[-1], 10)
cnt = cnt[:-1]
if cnt:
b = int(cnt[-1], 10)
cnt = cnt[:-1]
if cnt:
c = int(cnt[-1], 10)
cnt = cnt[:-1]
immediate = a | (b << 4) | (c << 8)
except ValueError as e:
raise AwlSimError("Invalid C# immediate")
return OpDescriptor(AwlOperator.IMM, 16, immediate, 0, 1)
if RawAwlInsn.isValidLabel(rawOp):
return OpDescriptor(AwlOperator.LBL_REF, 0, rawOp, 0, 1)
#TODO T#
#TODO TOD#
#TODO immediate L#
#TODO date D#
#TODO pointer P#x.y
#TODO binary immediate
#TODO floating point
raise AwlSimError("Cannot parse operand: " +\
str(rawOp))
@classmethod
def fromRawOperators(cls, rawOps):
op = cls.op2desc(rawOps[0])
if op.fieldCount == 2:
if len(rawOps) < 2:
raise AwlSimError("Missing operator")
if op.width == 1:
if op.offset == 0 and op.bitOffset == -1:
try:
op.bitOffset = int(rawOps[1], 10)
except ValueError as e:
if op.operType == AwlOperator.MEM_STW:
op.bitOffset = S7StatusWord.getBitnrByName(rawOps[1])
else:
raise AwlSimError("Invalid bit address")
else:
assert(op.offset == -1 and op.bitOffset == -1)
offset = rawOps[1].split('.')
if len(offset) != 2:
raise AwlSimError("Invalid bit address")
try:
op.offset = int(offset[0], 10)
op.bitOffset = int(offset[1], 10)
except ValueError as e:
raise AwlSimError("Invalid bit address")
elif op.width == 8:
assert(op.offset == -1 and op.bitOffset == 0)
try:
op.offset = int(rawOps[1], 10)
except ValueError as e:
raise AwlSimError("Invalid byte address")
elif op.width == 16:
assert(op.offset == -1 and op.bitOffset == 0)
try:
op.offset = int(rawOps[1], 10)
except ValueError as e:
raise AwlSimError("Invalid word address")
elif op.width == 32:
assert(op.offset == -1 and op.bitOffset == 0)
try:
op.offset = int(rawOps[1], 10)
except ValueError as e:
raise AwlSimError("Invalid doubleword address")
else:
assert(0)
if len(rawOps) > op.fieldCount:
if rawOps[op.fieldCount] != ',':
raise AwlSimError("Missing comma in operator list")
op.fieldCount += 1 # Consume comma
if len(rawOps) <= op.fieldCount:
raise AwlSimError("Trailing comma")
return (op.fieldCount,
AwlOperator(op.operType, op.width,
op.offset, op.bitOffset)
)
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