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 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 test_nan(self):
self.assertEqual(uint32(0x7fc00000), float32(str(math.nan)))
self.assertEqual(uint32(0xffc00000), float32('-nan'))
self.assertEqual(uint32(0x7f800000), float32(str(math.inf)))
self.assertEqual(uint32(0xff800000), float32('-inf'))
self.assertEqual(uint64(0x7ff8000000000001), float64(str(math.nan)))
self.assertEqual(uint64(0xfff8000000000001), float64('-nan'))
self.assertEqual(uint64(0x7ff0000000000000), float64(str(math.inf)))
self.assertEqual(uint64(0xfff0000000000000), float64('-inf'))
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 pop_f64(self):
val = self.pop_numeric()
try:
val = struct.unpack('>d', struct.pack('>q', val))[0]
except struct.error:
val = struct.unpack('>d', struct.pack('>Q', val))[0]
return float64(val)
def i32_trunc_f32u(vm, _):
val = float64(vm.pop_f32())
if math.isinf(val):
raise ErrIntOverflow
if math.isnan(val):
raise ErrConvertToInt
f = math.trunc(val)
if f > __MaxUint32 or f < 0:
raise ErrIntOverflow
vm.push_u32(uint32(f))
def visitExpected(self, ctx: WASTParser.ExpectedContext):
if ctx.nan is not None:
instr = new_instruction(ctx.op.text)
opcode = instr.opcode
if opcode == F32Const:
instr.args = float32('nan')
elif opcode == F64Const:
instr.args = float64('nan')
else:
raise Exception("TODO:NAN")
return instr
return ctx.constInstr().accept(self)
def parse_float(s: str, bit_size):
s = s.replace("_", "")
if s.find("0x") >= 0 > s.find('P') and s.find('p') < 0:
s += "p0"
f = float.fromhex(s)
elif s.find('P') > 0 or s.find('p') > 0:
f = float.fromhex(s)
else:
f = 0.0 if float(s) == 0 else float(s)
if bit_size == 32:
return float32(f)
else:
return float64(f)
def __trunc_sat_u(z, n):
if math.isnan(z):
return 0
if z == -math.inf:
return 0
max_value = (uint64(1) << n) - 1
if math.isinf(z):
return max_value
x = math.trunc(z)
if x < 0:
return 0
elif x >= float64(max_value):
return max_value
else:
return uint64(x)
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 f64_promote_f32(vm, _):
vm.push_f64(float64(vm.pop_f32()))
def f64_convert_i64u(vm, _):
vm.push_f64(float64(vm.pop_u64()))
def f64_convert_i64s(vm, _):
vm.push_f64(float64(vm.pop_s64()))
def f64_convert_i32u(vm, _):
vm.push_f64(float64(vm.pop_u32()))
def f64_convert_i32s(vm, _):
vm.push_f64(float64(vm.pop_s32()))
def f64_const(vm, args):
vm.push_f64(float64(args))