def wrap_u64(vt, val):
if vt == ValTypeI32:
return int32(val)
elif vt == ValTypeI64:
return int64(val)
elif vt == ValTypeF32:
try:
cov_val = struct.unpack('>f', struct.pack('>l', int64(val)))[0]
except struct.error:
cov_val = struct.unpack('>f', struct.pack('>L', int64(val)))[0]
if math.isnan(cov_val):
return float32(val)
else:
return float32(cov_val)
elif vt == ValTypeF64:
try:
cov_val = struct.unpack('>d', struct.pack('>q', int64(val)))[0]
except struct.error:
cov_val = struct.unpack('>d', struct.pack('>Q', int64(val)))[0]
if math.isnan(cov_val):
return float64(val)
else:
return float64(cov_val)
else:
raise Exception("unreachable")
def parse_nan64(s: str):
s = s.replace("_", "")
f = float64(math.nan)
if s[0] == '-':
f = -f
s = s[1:]
elif s[0] == '+':
s = s[1:]
if s.startswith("nan:0x"):
payload = int(s[6:], 16)
bits = struct.unpack('>q', struct.pack('>d',
f))[0] & 0xFFF7FFFFFFFFFFFE
try:
f = float64(
struct.unpack('>d', struct.pack('>q',
int64(bits | payload)))[0])
except struct.error:
f = float64(math.nan)
else:
bits = struct.unpack('>q', struct.pack('>d',
f))[0] & 0xFFFFFFFFFFFFFFFE
try:
f = float64(struct.unpack('>d', struct.pack('>q', int64(bits)))[0])
except struct.error:
f = float64(math.nan)
return f
def __trunc_sat_s(z, n):
if math.isnan(z):
return 0
min_value = -(int64(1) << (n - 1))
max_value = (int64(1) << (n - 1)) - 1
if z == -math.inf:
return min_value
if math.isinf(z):
return max_value
x = math.trunc(z)
if x < float64(min_value):
return min_value
elif x >= float64(max_value):
return max_value
else:
return int64(x)
def i64_trunc_f64s(vm, _):
val = vm.pop_f64()
if math.isinf(val):
raise ErrIntOverflow
if math.isnan(val):
raise ErrConvertToInt
f = math.trunc(val)
if f >= __MaxInt64 or f < __MinInt64:
raise ErrIntOverflow
vm.push_s64(int64(f))
def parse_int(s, bit_size):
base = 10
s = s.replace("_", "")
if s.startswith("+"):
s = s[1:]
if s.find("0x") >= 0:
s = s.replace("0x", "", 1)
base = 16
if s.startswith("-"):
i = int(s, base)
else:
u = int(s, base)
i = int64(u)
return i
def get_consts(expr):
if len(expr) == 0:
vals = []
else:
vals = [None] * len(expr)
for i, instr in enumerate(expr):
opcode = instr.opcode
if opcode == I32Const:
vals[i] = int32(instr.args)
elif opcode == I64Const:
vals[i] = int64(instr.args)
elif opcode == F32Const:
vals[i] = float32(instr.args)
elif opcode == F64Const:
vals[i] = float64(instr.args)
else:
raise Exception("TODO")
return vals
def test_operand_stack(self):
stack = OperandStack()
stack.push_bool(True)
stack.push_bool(False)
stack.push_u32(1)
stack.push_s32(-2)
stack.push_u64(3)
stack.push_s64(-4)
stack.push_f32(5.5)
stack.push_f64(6.5)
self.assertEqual(6.5, stack.pop_f64())
self.assertEqual(float32(5.5), stack.pop_f32())
self.assertEqual(int64(-4), stack.pop_s64())
self.assertEqual(uint64(3), stack.pop_u64())
self.assertEqual(int32(-2), stack.pop_s32())
self.assertEqual(uint32(1), stack.pop_u32())
self.assertEqual(False, stack.pop_bool())
self.assertEqual(True, stack.pop_bool())
self.assertEqual(0, len(stack.slots))
def parse_nan32(s: str):
s = s.replace("_", "")
f = float32(math.nan)
if s[0] == '-':
f = -f
s = s[1:]
elif s[0] == '+':
s = s[1:]
if s.startswith("nan:0x"):
payload = int(s[6:], 16)
bits = struct.unpack('>l', struct.pack('>f', f))[0] & 0xFFBFFFFF
try:
f = float32(
struct.unpack('>f',
struct.pack('>l',
int64(bits | uint32(payload))))[0])
except struct.error:
f = float32(math.nan)
return f
def i64_extend_16s(vm, _):
vm.push_s64(int64(int16(vm.pop_s64())))
def pop_f32(self):
val = self.pop_numeric()
val = struct.unpack('>f', struct.pack('>l', int64(val)))[0]
return float32(val)
def i64_load_32s(vm, mem_arg):
val = read_u32(vm, mem_arg)
vm.push_s64(int64(int32(val)))
def i64_load_16s(vm, mem_arg):
val = read_u16(vm, mem_arg)
vm.push_s64(int64(int16(val)))
def i64_load_8s(vm, mem_arg):
val = read_u8(vm, mem_arg)
vm.push_s64(int64(int8(val)))
def i64_extend_32s(vm, _):
vm.push_s64(int64(int32(vm.pop_s64())))
def pop_s64(self) -> int64:
return int64(self.pop_numeric())
def i64_extend_8s(vm, _):
vm.push_s64(int64(int8(vm.pop_s64())))
def i64_const(vm, args):
vm.push_s64(int64(args))
def i64_extend_i32s(vm, _):
vm.push_s64(int64(vm.pop_s32()))