def _load_program(self, startaddr, tapename, procname=None):
'''Load a program into memory from a stored tape (a file) starting
at address startaddr. Create a PCB for the program and add to
the ready q. Use the first part of the tapename as the procname,
if not provided.
'''
if procname is None:
# Lop off .* from the end.
procname = tapename[:tapename.find(".")]
pcb = None
try:
with open(tapename, "r") as f:
pcb = calos.PCB(procname)
if self._debug:
print("Created PCB for process {}".format(procname))
addr = startaddr
for line in f:
line = line.strip()
if line == '':
continue # skip empty lines
if line.startswith('#'):
continue # skip comment lines
if line.isdigit():
# data
self._ram[addr] = int(line)
else: # instructions or label
# Detect entry point label
if line == "__main:":
if self._debug:
print("Main found at location", addr)
pcb.set_entry_point(addr)
continue
self._ram[addr] = line
addr += 1
print("Tape loaded from {} to {}".format(startaddr, addr))
pcb.set_memory_limits(startaddr, addr)
if self._debug:
print(pcb)
except FileNotFoundError:
print("File not found")
if pcb is not None:
self._os.add_to_ready_q(pcb)
def _load_program(self, startaddr, tapename, procname=None):
'''Load a program into memory from a stored tape (a file) starting
at address startaddr. Create a PCB for the program and add to
the ready q. Use the first part of the tapename as the procname,
if not provided.
'''
if procname is None:
# Lop off .* from the end.
procname = tapename[:tapename.find(".")]
pcb = None
try:
with open(tapename, "r") as f:
pcb = calos.PCB(procname)
if self._debug:
print("Created PCB for process {}".format(procname))
addr = startaddr
pcb.set_low_mem(addr)
for line in f:
line = line.strip()
if line == '':
continue # skip empty lines
if line.startswith('#'):
continue # skip comment lines
if line.isdigit():
# data
self._ram[addr] = int(line)
addr += 1
elif line.startswith("__main:"):
self._handle_main_label(addr, line, pcb)
elif line.startswith("__data:"):
self._handle_data_label(addr, line, pcb)
else: # the line is regular code: store it in ram
self._ram[addr] = line
addr += 1
print("Tape loaded from {} to {}".format(startaddr, addr))
if self._debug:
print(pcb)
except FileNotFoundError:
print("File not found")
if pcb is not None:
self._os.add_to_ready_q(pcb)