feat: какая-то минимальная система обработки опкодов

src/vm.py

@@ -0,0 +1,172 @@
+
+from dataclasses import dataclass, field
+from typing import ClassVar, Callable, Any
+from ctypes import c_uint32, c_int32, c_uint8
+import struct
+from optable import OPCODES, OpcodeDescription, OpL, OpA, OpF, OpD
+from enum import IntFlag, auto
+
+class VMFlags(IntFlag):
+    AFTER_BRANCH = auto()
+
+class Condition:
+    def __init__(self, cond: int):
+        self.i: bool = bool(cond & (1 << 3))
+        self.v: bool = bool(cond & (1 << 2))
+        self.n: bool = bool(cond & (1 << 1))
+        self.z: bool = bool(cond & (1 << 0))
+
+@dataclass
+class VM:
+    instr_callbacks: ClassVar[dict[OpcodeDescription, Callable]]
+
+    def __init__(self, mem):
+        self.mem: bytearray = mem
+        self.cc: c_uint8 = c_uint8(0)
+        self.pc: c_uint32 = c_uint32(0)
+        self.registers: list[c_int32] = [c_int32(0) for _ in range(256)]
+        self.breakpoints: set[int] = field(default_factory=set)
+        self._vm_flags: VMFlags = VMFlags(0)
+        self.__init_callbacks__()
+
+    def __init_callbacks__(self):
+        VM.instr_callbacks = {
+                # ariphmetic
+                OpD(OpF(0), OpL.MATH, OpA.ADD):
+                self._math_callback_gen(lambda lhs, rhs: lhs + rhs),
+
+                OpD(OpF.QUICK, OpL.MATH, OpA.ADD):
+                self._math_quick_callback_gen(lambda lhs, rhs: lhs + rhs),
+
+                OpD(OpF(0), OpL.MATH, OpA.SUB):
+                self._math_callback_gen(lambda lhs, rhs: lhs - rhs),
+
+                OpD(OpF.QUICK, OpL.MATH, OpA.SUB):
+                self._math_quick_callback_gen(lambda lhs, rhs: lhs - rhs),
+
+                OpD(OpF(0), OpL.MATH, OpA.MUL):
+                self._math_callback_gen(lambda lhs, rhs: lhs * rhs),
+
+                OpD(OpF.QUICK, OpL.MATH, OpA.MUL):
+                self._math_quick_callback_gen(lambda lhs, rhs: lhs * rhs),
+
+                OpD(OpF(0), OpL.MATH, OpA.DIV):
+                self._math_callback_gen(lambda lhs, rhs: lhs // rhs),
+
+                OpD(OpF.QUICK, OpL.MATH, OpA.DIV):
+                self._math_quick_callback_gen(lambda lhs, rhs: lhs // rhs),
+
+                # logical ops
+                OpD(OpF.UNEXPANDED, OpL.MATH, OpA.AND): 
+                self._math_callback_gen(lambda lhs, rhs: lhs & rhs),
+
+                OpD(OpF.UNEXPANDED, OpL.MATH, OpA.OR): 
+                self._math_callback_gen(lambda lhs, rhs: lhs | rhs),
+
+                OpD(OpF.UNEXPANDED, OpL.MATH, OpA.XOR):
+                self._math_callback_gen(lambda lhs, rhs: lhs ^ rhs),
+
+                OpD(OpF.UNEXPANDED, OpL.MATH, OpA.MASK):
+                self._math_callback_gen(
+                    lambda lhs, rhs: lhs & ((~rhs + (1 << 32)) % (1 << 32))
+                    ),
+
+                # block 2
+                OpD(OpF(0), OpL.MEM, OpA.LOAD):
+                self._load_callback,
+                OpD(OpF.QUICK, OpL.MEM, OpA.LOAD):
+                self._load_callback,
+                OpD(OpF(0), OpL.MEM, OpA.STORE):
+                self._store_callback,
+                OpD(OpF.QUICK, OpL.MEM, OpA.STORE):
+                self._store_callback,
+
+                # block 3
+                OpD(OpF(0), OpL.BRANCH, OpA.BRANCH):
+                    self._branch_callback,
+                OpD(OpF.QUICK, OpL.BRANCH, OpA.BRANCH):
+                    self._branch_callback,
+                OpD(OpF(0), OpL.BRANCH, OpA.MEM_BRANCH):
+                    self._branch_indexed_callback
+                }
+
+    def step(self) -> None:
+        """
+        Make one step (only step into)
+        """
+        opcode = self.mem[self.pc.value]
+        opdesc = self._fetch_opcode_desc(opcode)
+        if not VMFlags.AFTER_BRANCH:
+            self.pc = c_uint32(self.cc.value + 1)
+        self._vm_flags 
+
+    def continue_(self) -> None:
+        """
+        Continue from current breakpoint
+        """
+        pass
+
+    def run(self) -> None:
+        """
+        Run from very beginning
+        """
+
+    def _fetch_opcode_desc(self, opcode: int):
+        return OPCODES[opcode]
+
+    def _math_callback_gen(
+            self,
+            operation: Callable[[int, int], int]
+            ) -> Callable[["VM", int,  int ,int], None]:
+        """
+        Поскольку математические операции конструируются
+        по одному шаблону, я завел функцию высшего порядка,
+        которая будет их генерировать
+        """
+        def callback(self, r3: int, r1: int, r2: int):
+            lhs = self.registers[r1].value
+            rhs = self.registers[r2].value
+            self.registers[r3] = c_int32(operation(lhs, rhs))
+        return callback
+
+    def _math_quick_callback_gen(
+            self,
+            operation: Callable[[int, int], int]
+            ) -> Callable[["VM", int,  int ,int], None]:
+        """
+        Поскольку математические операции конструируются
+        по одному шаблону, я завел функцию высшего порядка,
+        которая будет их генерировать.
+
+        В отлиие от _math_callback_gen, эта уже предназначена для
+        операций с пометкой QUICK
+        """
+        def callback(self, r3: int, r1: int, i8: int) -> None:
+            lhs = self.registers[r1].value
+            self.registers[r3] = c_int32(operation(lhs, i8))
+        return callback
+
+    def _load_callback(self, r3: int, r1: int, disp: int) -> None:
+        addr = (self.registers[r1].value + disp) * 4
+        self.registers[r3] = c_int32(
+                struct.unpack("i", self.mem[addr:addr+4])[0]
+                )
+
+    def _store_callback(self, r3: int, r1: int, disp: int) -> None:
+        addr = (self.registers[r1].value + disp) * 4
+        self.mem[addr:addr+4] = struct.pack("i", self.registers[r3].value)
+
+    def _branch_callback(self, cond: int, disp: int) -> None:
+        c = Condition(cond)
+        vm_c = Condition(self.cc.value)
+        if (c.v & vm_c.v) & (c.n & vm_c.n) & (c.z & vm_c.z) == c.i:
+            self._vm_flags |= VMFlags.AFTER_BRANCH
+            self.pc = c_uint32(self.pc.value + disp)
+
+    def _branch_indexed_callback(self, cond: int, r1: int, disp: int) -> None:
+        c = Condition(cond)
+        vm_c = Condition(self.cc.value)
+        if (c.v & vm_c.v) & (c.n & vm_c.n) & (c.z & vm_c.z) == c.i:
+            self._vm_flags |= VMFlags.AFTER_BRANCH
+            addr = self.registers[r1].value + disp
+            self.pc = c_uint32(addr)