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optimized opcode dispatch

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This commit is contained in:
Irmen de Jong 2018-02-28 02:40:16 +01:00
parent 13273ce6cc
commit 8e7c504a88
2 changed files with 35 additions and 5 deletions
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4
testvm.txt
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@ -3,8 +3,8 @@
%vardefs %vardefs
var byte teller 1 var byte teller 1
const byte one 1 const byte one 1
const byte thousand 1000 const byte thousand 100000
var array_byte newlinestr 1 10 var array_byte newlinestr 2 [32 32]
%end_vardefs %end_vardefs
%instructions %instructions

36
tinyvm/vm.py
View File

@ -229,7 +229,6 @@ class VM:
self.main_stack = Stack() self.main_stack = Stack()
self.timer_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.main_program)
self.connect_instruction_pointers(self.timer_program) self.connect_instruction_pointers(self.timer_program)
self.program = self.main_program self.program = self.main_program
@ -318,7 +317,7 @@ class VM:
try: try:
while self.pc is not None: while self.pc is not None:
with self.timer_irq_interlock: with self.timer_irq_interlock:
next_pc = getattr(self, "opcode_" + self.pc.opcode.name)(self.pc) next_pc = self.dispatch_table[self.pc.opcode](self, self.pc)
if next_pc: if next_pc:
self.pc = self.pc.next self.pc = self.pc.next
except TerminateExecution as x: except TerminateExecution as x:
@ -350,7 +349,7 @@ class VM:
self.stack.push(ReturnInstruction(None)) # sentinel self.stack.push(ReturnInstruction(None)) # sentinel
self.stack.push(CallFrameMarker()) # enter the call frame so the timer program can end with a RETURN self.stack.push(CallFrameMarker()) # enter the call frame so the timer program can end with a RETURN
while self.pc is not None: while self.pc is not None:
next_pc = getattr(self, "opcode_" + self.pc.opcode.name)(self.pc) next_pc = self.dispatch_table[self.pc.opcode](self, self.pc)
if next_pc: if next_pc:
self.pc = self.pc.next self.pc = self.pc.next
self.pc = previous_pc self.pc = previous_pc
@ -536,6 +535,37 @@ class VM:
else: else:
raise RuntimeError("no syscall method for " + instruction.args[0]) raise RuntimeError("no syscall method for " + instruction.args[0])
dispatch_table = {
Opcode.TERMINATE: opcode_TERMINATE,
Opcode.NOP: opcode_NOP,
Opcode.PUSH: opcode_PUSH,
Opcode.PUSH2: opcode_PUSH2,
Opcode.PUSH3: opcode_PUSH3,
Opcode.POP: opcode_POP,
Opcode.POP2: opcode_POP2,
Opcode.POP3: opcode_POP3,
Opcode.ADD: opcode_ADD,
Opcode.SUB: opcode_SUB,
Opcode.MUL: opcode_MUL,
Opcode.DIV: opcode_DIV,
Opcode.AND: opcode_AND,
Opcode.OR: opcode_OR,
Opcode.XOR: opcode_XOR,
Opcode.NOT: opcode_NOT,
Opcode.TEST: opcode_TEST,
Opcode.CMP_EQ: opcode_CMP_EQ,
Opcode.CMP_LT: opcode_CMP_LT,
Opcode.CMP_GT: opcode_CMP_GT,
Opcode.CMP_LTE: opcode_CMP_LTE,
Opcode.CMP_GTE: opcode_CMP_GTE,
Opcode.CALL: opcode_CALL,
Opcode.RETURN: opcode_RETURN,
Opcode.JUMP: opcode_JUMP,
Opcode.JUMP_IF_TRUE: opcode_JUMP_IF_TRUE,
Opcode.JUMP_IF_FALSE: opcode_JUMP_IF_FALSE,
Opcode.SYSCALL: opcode_SYSCALL,
}
class System: class System:
def __init__(self, vm: VM) -> None: def __init__(self, vm: VM) -> None: