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 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 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 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 f32_demote_f64(vm, _):
vm.push_f32(float32(vm.pop_f64()))
def f32_convert_i64u(vm, _):
vm.push_f32(float32(vm.pop_u64()))
def f32_convert_i64s(vm, _):
vm.push_f32(float32(vm.pop_s64()))
def f32_convert_i32u(vm, _):
vm.push_f32(float32(vm.pop_u32()))
def f32_convert_i32s(vm, _):
vm.push_f32(float32(vm.pop_s32()))
def f32_const(vm, args):
vm.push_f32(float32(args))
def pop_f32(self):
val = self.pop_numeric()
val = struct.unpack('>f', struct.pack('>l', int64(val)))[0]
return float32(val)