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timer 'irq' in vm

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This commit is contained in:
Irmen de Jong 2018-02-27 22:16:45 +01:00
parent e9b5bc8200
commit 13273ce6cc
5 changed files with 178 additions and 139 deletions
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63
testvm.txt
View File

@ -1,50 +1,35 @@
; source code for a tinyvm program
%block b1
%vardefs
var byte vb 1
var word vw 2233
var sbyte vbs -2
var sword vws -3344
var float vf 1.234
var array_byte ab 3 1
var array_sbyte asb 3 -2
var array_word aw 3 4455
var array_sword asw 3 -5566
var matrix_byte mb 2 3 1
var matrix_sbyte msb 2 3 -2
var array_byte ab2 5 1
var array_sbyte asb2 5 -2
var array_word aw2 5 6677
var array_sword asw2 5 -8899
var matrix_byte mb2 4 5 1
var matrix_sbyte msb2 4 5 -2
var byte teller 1
const byte one 1
const byte thousand 1000
var array_byte newlinestr 1 10
%end_vardefs
%instructions
push vw
pop vb
terminate
push teller
syscall decimalstr_signed
syscall printstr
push newlinestr
syscall printstr
back:
push teller
push one
add
pop teller
push teller
syscall decimalstr_signed
syscall printstr
push newlinestr
syscall printstr
push teller
push thousand
cmp_lt
jump_if_true back
return
%end_instructions
%subblocks
%block b2
%vardefs
%end_vardefs
%end_block ; b2
%end_subblocks
%end_block ;b1
%block b3
%vardefs
%end_vardefs
%instructions
nop
nop
l2:
return
%end_instructions
%end_block ; b3

60
tinyvm/core.py
View File

@ -3,36 +3,34 @@ from typing import Any, List, Dict, Optional
class Opcode(enum.IntEnum):
NOP = 0
TERMINATE = 1
TERMINATE = 0
NOP = 1
PUSH = 10
PUSH2 = 11
PUSH3 = 12
POP = 20
POP2 = 21
POP3 = 22
ADD = 100
SUB = 101
MUL = 102
DIV = 103
AND = 200
OR = 201
XOR = 202
NOT = 203
CMP_EQ = 300
CMP_LT = 301
CMP_GT = 302
CMP_LTE = 303
CMP_GTE = 304
TEST = 305
RETURN = 500
JUMP = 501
JUMP_IF_TRUE = 502
JUMP_IF_FALSE = 503
SYSCALL = 504
CONDITIONAL_OPCODES = {Opcode.JUMP_IF_FALSE, Opcode.JUMP_IF_TRUE}
POP = 13
POP2 = 14
POP3 = 15
ADD = 50
SUB = 51
MUL = 52
DIV = 53
AND = 70
OR = 71
XOR = 72
NOT = 73
TEST = 100
CMP_EQ = 101
CMP_LT = 102
CMP_GT = 103
CMP_LTE = 104
CMP_GTE = 105
CALL = 200
RETURN = 201
JUMP = 202
JUMP_IF_TRUE = 203
JUMP_IF_FALSE = 204
SYSCALL = 205
class DataType(enum.IntEnum):
@ -63,13 +61,13 @@ class Variable:
class Instruction:
__slots__ = ["opcode", "args", "next", "condnext"]
__slots__ = ["opcode", "args", "next", "alt_next"]
def __init__(self, opcode: Opcode, args: List[Any], nxt: Optional['Instruction'], condnxt: Optional['Instruction']) -> None:
def __init__(self, opcode: Opcode, args: List[Any], nxt: Optional['Instruction'], alt_next: Optional['Instruction']) -> None:
self.opcode = opcode
self.args = args
self.next = nxt # regular next statement, None=end
self.condnext = condnxt # alternate next statement (for condition nodes)
self.next = nxt # regular next statement, None=end
self.alt_next = alt_next # alternate next statement (for condition nodes, and return instruction for call nodes)
def __str__(self) -> str:
return "<Instruction {} args: {}>".format(self.opcode.name, self.args)

8
tinyvm/main.py
View File

@ -1,6 +1,6 @@
import sys
from .parse import Parser
from .core import Program
from .core import Program, Opcode, Block, Instruction
from .vm import VM
@ -8,8 +8,10 @@ source = open(sys.argv[1]).read()
parser = Parser(source)
program = parser.parse()
timerprogram = Program([])
timerprogram = Program([Block("timer", None, [], [
Instruction(Opcode.RETURN, [], None, None)
], {}, [])])
# zero page and hardware stack of a 6502 cpu are off limits for now
VM.readonly_mem_ranges = [(0x00, 0xff), (0x100, 0x1ff), (0xa000, 0xbfff), (0xe000, 0xffff)]
vm = VM(program, timerprogram)
vm = VM(program)
vm.run()

7
tinyvm/parse.py
View File

@ -125,10 +125,13 @@ class Parser:
label = line[:-1].rstrip()
self.lineno += 1
line = self.source[self.lineno]
labels[label] = parse_instruction(line)
next_instruction = parse_instruction(line)
labels[label] = next_instruction
instructions.append(next_instruction)
self.lineno += 1
else:
instructions.append(parse_instruction(line))
self.lineno += 1
self.lineno += 1
self.skip_empty()
assert self.source[self.lineno].startswith("%end_instructions")
self.lineno += 1

179
tinyvm/vm.py
View File

@ -51,17 +51,19 @@
# call function (arguments are on stack)
# enter / exit (function call frame)
#
# TIMER INTERRUPT: triggered every 1/60th of a second.
# TIMER INTERRUPT: triggered around each 1/30th of a second.
# executes on a DIFFERENT stack and with a different PROGRAM LIST,
# but with access to ALL THE SAME DYNAMIC VARIABLES.
# This suspends the main program until the timer program RETURNs!
#
import time
import itertools
import collections
import array
import threading
import pprint
from .core import Instruction, Variable, Block, Program, Opcode, CONDITIONAL_OPCODES
from .core import Instruction, Variable, Block, Program, Opcode
from typing import Dict, List, Tuple, Union
from il65.emit import mflpt5_to_float, to_mflpt5
@ -131,7 +133,18 @@ class Memory:
self.mem[index: index+5] = to_mflpt5(value)
StackValueType = Union[bool, int, float, bytearray, array.array]
class CallFrameMarker:
pass
class ReturnInstruction:
__slots__ = ["instruction"]
def __init__(self, instruction: Instruction) -> None:
self.instruction = instruction
StackValueType = Union[bool, int, float, bytearray, array.array, CallFrameMarker, ReturnInstruction]
class Stack:
@ -188,8 +201,8 @@ class Stack:
self.stack[-2] = x
def _typecheck(self, value: StackValueType):
if type(value) not in (bool, int, float, bytearray, array.array):
raise TypeError("stack can only contain bool, int, float, (byte)array")
if type(value) not in (bool, int, float, bytearray, array.array, CallFrameMarker, ReturnInstruction):
raise TypeError("invalid item type pushed")
# noinspection PyPep8Naming,PyUnusedLocal,PyMethodMayBeStatic
@ -197,8 +210,11 @@ class VM:
str_encoding = "iso-8859-15"
str_alt_encoding = "iso-8859-15"
readonly_mem_ranges = [] # type: List[Tuple[int, int]]
timer_irq_resolution = 1/30
timer_irq_interlock = threading.Lock()
timer_irq_event = threading.Event()
def __init__(self, program: Program, timerprogram: Program) -> None:
def __init__(self, program: Program, timerprogram: Program=Program([])) -> None:
opcode_names = [oc.name for oc in Opcode]
for ocname in opcode_names:
if not hasattr(self, "opcode_" + ocname):
@ -212,33 +228,39 @@ class VM:
self.memory.mark_readonly(start, end)
self.main_stack = Stack()
self.timer_stack = Stack()
(self.main_program, self.timer_program), self.variables, self.labels = self.flatten_programs(program, timerprogram)
self.main_program, self.timer_program, self.variables, self.labels = self.flatten_programs(program, timerprogram)
print("MAIN PROGRAM"); pprint.pprint([str(i) for i in self.main_program])
self.connect_instruction_pointers(self.main_program)
self.connect_instruction_pointers(self.timer_program)
self.program = self.main_program
self.stack = self.main_stack
self.pc = None # type: Instruction
self.previous_pc = None # type: Instruction
self.system = System(self)
assert all(i.next for i in self.main_program
if i.opcode != Opcode.TERMINATE), "main: all instrs next must be set"
assert all(i.next for i in self.timer_program
if i.opcode != Opcode.TERMINATE), "main: all instrs next must be set"
assert all(i.condnext for i in self.main_program
if i.opcode in CONDITIONAL_OPCODES), "timer: all conditional instrs condnext must be set"
assert all(i.condnext for i in self.timer_program
if i.opcode in CONDITIONAL_OPCODES), "timer: all conditional instrs condnext must be set"
if i.opcode not in (Opcode.TERMINATE, Opcode.RETURN)), "timer: all instrs next must be set"
assert all(i.alt_next for i in self.main_program
if i.opcode in (Opcode.CALL, Opcode.JUMP_IF_FALSE, Opcode.JUMP_IF_TRUE)), "main: alt_nexts must be set"
assert all(i.alt_next for i in self.timer_program
if i.opcode in (Opcode.CALL, Opcode.JUMP_IF_FALSE, Opcode.JUMP_IF_TRUE)), "timer: alt_nexts must be set"
threading.Thread(target=self.timer_irq, name="timer_irq", daemon=True).start()
print("[TinyVM starting up.]")
def flatten_programs(self, *programs: Program) -> Tuple[List[List[Instruction]], Dict[str, Variable], Dict[str, Instruction]]:
variables = {} # type: Dict[str, Variable]
labels = {} # type: Dict[str, Instruction]
flat_programs = [] # type: List[List[Instruction]]
for program in programs:
for block in program.blocks:
flat = self.flatten(block, variables, labels)
flat_programs.append(flat)
return flat_programs, variables, labels
def flatten_programs(self, main: Program, timer: Program) \
-> Tuple[List[Instruction], List[Instruction], Dict[str, Variable], Dict[str, Instruction]]:
variables = {} # type: Dict[str, Variable]
labels = {} # type: Dict[str, Instruction]
instructions_main = [] # type: List[Instruction]
instructions_timer = [] # type: List[Instruction]
for block in main.blocks:
flat = self.flatten(block, variables, labels)
instructions_main.extend(flat)
instructions_main.append(Instruction(Opcode.TERMINATE, [], None, None))
for block in timer.blocks:
flat = self.flatten(block, variables, labels)
instructions_timer.extend(flat)
return instructions_main, instructions_timer, variables, labels
def flatten(self, block: Block, variables: Dict[str, Variable], labels: Dict[str, Instruction]) -> List[Instruction]:
def block_prefix(b: Block) -> str:
@ -269,7 +291,6 @@ class VM:
labels[name] = instr
for subblock in block.blocks:
instructions.extend(self.flatten(subblock, variables, labels))
instructions.append(Instruction(Opcode.TERMINATE, [], None, None))
del block.instructions
del block.variables
del block.labels
@ -279,42 +300,65 @@ class VM:
i1, i2 = itertools.tee(instructions)
next(i2, None)
for i, nexti in itertools.zip_longest(i1, i2):
i.next = nexti
if i.opcode in CONDITIONAL_OPCODES:
i.condnext = self.labels[i.args[0]]
if i.opcode in (Opcode.JUMP_IF_TRUE, Opcode.JUMP_IF_FALSE):
i.next = nexti # normal flow target
i.alt_next = self.labels[i.args[0]] # conditional jump target
elif i.opcode == Opcode.JUMP:
i.next = self.labels[i.args[0]] # jump target
elif i.opcode == Opcode.CALL:
i.next = self.labels[i.args[0]] # call target
i.alt_next = nexti # return instruction
else:
i.next = nexti
def run(self) -> None:
last_timer = time.time()
self.pc = self.program[0] # first instruction of the main program
steps = 1
self.stack.push(ReturnInstruction(None)) # sentinel
self.stack.push(CallFrameMarker()) # enter the call frame so the timer program can end with a RETURN
try:
while True:
now = time.time()
# if now - last_timer >= 1/60:
# last_timer = now
# # start running the timer interrupt program instead
# self.previous_pc = self.pc
# self.program = self.timer_program
# self.stack = self.timer_stack
# self.pc = 0
# while True:
# self.dispatch(self.program[self.pc])
# return True
# self.pc = self.previous_pc
# self.program = self.mainprogram
# self.stack = self.mainstack
next_pc = getattr(self, "opcode_" + self.pc.opcode.name)(self.pc)
if next_pc:
self.pc = self.pc.next
steps += 1
while self.pc is not None:
with self.timer_irq_interlock:
next_pc = getattr(self, "opcode_" + self.pc.opcode.name)(self.pc)
if next_pc:
self.pc = self.pc.next
except TerminateExecution as x:
why = str(x)
print("[TinyVM execution halted{:s}]\n".format(": "+why if why else "."))
print("[TinyVM execution terminated{:s}]\n".format(": "+why if why else "."))
return
except Exception as x:
print("EXECUTION ERROR")
self.debug_stack(5)
raise
else:
print("[TinyVM execution ended.]")
def timer_irq(self) -> None:
resolution = 1/30
wait_time = resolution
while True:
self.timer_irq_event.wait(wait_time)
self.timer_irq_event.clear()
start = time.perf_counter()
if self.timer_program:
with self.timer_irq_interlock:
previous_pc = self.pc
previous_program = self.program
previous_stack = self.stack
self.stack = self.timer_stack
self.program = self.timer_program
self.pc = self.program[0]
self.stack.push(ReturnInstruction(None)) # sentinel
self.stack.push(CallFrameMarker()) # enter the call frame so the timer program can end with a RETURN
while self.pc is not None:
next_pc = getattr(self, "opcode_" + self.pc.opcode.name)(self.pc)
if next_pc:
self.pc = self.pc.next
self.pc = previous_pc
self.program = previous_program
self.stack = previous_stack
current = time.perf_counter()
duration, previously = current - start, current
wait_time = max(0, resolution - duration)
def debug_stack(self, size: int=5) -> None:
stack = self.stack.debug_peek(size)
@ -424,15 +468,15 @@ class VM:
self.stack.push(not self.stack.pop())
return True
def opcode_TEST(self, instruction: Instruction) -> bool:
self.stack.push(bool(self.stack.pop()))
return True
def opcode_CMP_EQ(self, instruction: Instruction) -> bool:
second, first = self.stack.pop2()
self.stack.push(first == second)
return True
def opcode_TEST(self, instruction: Instruction) -> bool:
self.stack.push(bool(self.stack.pop()))
return True
def opcode_CMP_LT(self, instruction: Instruction) -> bool:
second, first = self.stack.pop2()
self.stack.push(first < second) # type: ignore
@ -453,29 +497,36 @@ class VM:
self.stack.push(first >= second) # type: ignore
return True
def opcode_RETURN(self, instruction: Instruction) -> bool:
# returns from the current function call
# any return values have already been pushed on the stack
raise NotImplementedError("return")
def opcode_JUMP(self, instruction: Instruction) -> bool:
# jumps unconditionally by resetting the PC to the given instruction index value
def opcode_CALL(self, instruction: Instruction) -> bool:
self.stack.push(ReturnInstruction(instruction.alt_next))
self.stack.push(CallFrameMarker())
return True
def opcode_RETURN(self, instruction: Instruction) -> bool:
# unwind the function call frame
item = self.stack.pop()
while not isinstance(item, CallFrameMarker):
item = self.stack.pop()
returninstruction = self.stack.pop()
assert isinstance(returninstruction, ReturnInstruction)
self.pc = returninstruction.instruction
return False
def opcode_JUMP(self, instruction: Instruction) -> bool:
return True # jump simply points to the next instruction elsewhere
def opcode_JUMP_IF_TRUE(self, instruction: Instruction) -> bool:
# pops stack and jumps if that value is true, by resetting the PC to the given instruction index value
result = self.stack.pop()
if result:
self.pc = self.pc.condnext
self.pc = self.pc.alt_next # alternative next instruction
return False
return True
def opcode_JUMP_IF_FALSE(self, instruction: Instruction) -> bool:
# pops stack and jumps if that value is false, by resetting the PC to the given instruction index value
result = self.stack.pop()
if result:
return True
self.pc = self.pc.condnext
self.pc = self.pc.alt_next # alternative next instruction
return False
def opcode_SYSCALL(self, instruction: Instruction) -> bool:
@ -498,7 +549,7 @@ class System:
def syscall_printstr(self) -> bool:
value = self.vm.stack.pop()
if isinstance(value, bytearray):
if isinstance(value, (bytearray, array.array)):
print(self._decodestr(value), end="")
return True
else: