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import pytest
import struct
from rpython.rtyper.lltypesystem import lltype, rffi
from rpython.rlib.rarithmetic import r_singlefloat, long_typecode
from rpython.rlib.buffer import (
StringBuffer, SubBuffer, Buffer, RawBuffer,
LLBuffer, RawByteBuffer, ByteBuffer)
from rpython.annotator.annrpython import RPythonAnnotator
from rpython.annotator.model import SomeInteger
from rpython.jit.metainterp.test.support import LLJitMixin
class MyRawBuffer(RawBuffer):
def __init__(self, data, readonly=True):
self.readonly = readonly
self._n = len(data)
self._buf = lltype.malloc(rffi.CCHARP.TO, self._n, flavor='raw')
for i, ch in enumerate(data):
self._buf[i] = ch
def get_raw_address(self):
return self._buf
def as_str(self):
return rffi.charpsize2str(self._buf, self._n)
def setitem(self, i, char):
assert not self.readonly
self._buf[i] = char
def __del__(self):
lltype.free(self._buf, flavor='raw')
self._buf = None
def test_string_buffer():
buf = StringBuffer('hello world')
assert buf.getitem(4) == 'o'
assert buf.getitem(4) == buf[4]
assert buf.getlength() == 11
assert buf.getlength() == len(buf)
assert buf.getslice(1, 1, 5) == 'ello '
assert buf.getslice(1, 1, 5) == buf[1:6]
assert buf.getslice(1, 2, 3) == 'el '
assert buf.as_str() == 'hello world'
def test_len_nonneg():
# This test needs a buffer subclass whose getlength() isn't guaranteed to
# return a non-neg integer.
class DummyBuffer(Buffer):
def __init__(self, s):
self.size = s
def getlength(self):
return self.size
def func(n):
buf = DummyBuffer(n)
return len(buf)
a = RPythonAnnotator()
s = a.build_types(func, [int])
assert s == SomeInteger(nonneg=True)
def test_repeated_subbuffer():
buf = StringBuffer('x' * 10000)
for i in range(9999, 9, -1):
buf = SubBuffer(buf, 1, i)
assert buf.getlength() == 10
def test_string_buffer_as_buffer():
buf = StringBuffer(b'hello world')
addr = buf.get_raw_address()
assert addr[0] == b'h'
assert addr[4] == b'o'
assert addr[6] == b'w'
def test_setzeros():
buf = MyRawBuffer('ABCDEFGH', readonly=False)
buf.setzeros(2, 3)
assert buf.as_str() == 'AB\x00\x00\x00FGH'
class BaseTypedReadTest:
def test_signed(self):
buf = struct.pack('@%s%s' % (long_typecode, long_typecode), 42, 43)
size = struct.calcsize('@%s' % long_typecode)
assert self.read(lltype.Signed, buf, 0) == 42
assert self.read(lltype.Signed, buf, size) == 43
def test_short(self):
buf = struct.pack('@hh', 42, 43)
size = struct.calcsize('@h')
x = self.read(rffi.SHORT, buf, 0)
assert int(x) == 42
x = self.read(rffi.SHORT, buf, size)
assert int(x) == 43
def test_float(self):
buf = struct.pack('@dd', 12.3, 45.6)
size = struct.calcsize('@d')
assert self.read(lltype.Float, buf, 0) == 12.3
assert self.read(lltype.Float, buf, size) == 45.6
def test_singlefloat(self):
buf = struct.pack('@ff', 12.3, 45.6)
size = struct.calcsize('@f')
x = self.read(lltype.SingleFloat, buf, 0)
assert x == r_singlefloat(12.3)
x = self.read(lltype.SingleFloat, buf, size)
assert x == r_singlefloat(45.6)
class TestTypedReadDirect(BaseTypedReadTest):
def read(self, TYPE, data, offset):
buf = StringBuffer(data)
return buf.typed_read(TYPE, offset)
class TestSubBufferTypedReadDirect(BaseTypedReadTest):
def read(self, TYPE, data, offset):
buf = StringBuffer('x' * 16 + data)
subbuf = SubBuffer(buf, 16, len(data))
return subbuf.typed_read(TYPE, offset)
class TestRawBufferTypedReadDirect(BaseTypedReadTest):
def read(self, TYPE, data, offset):
buf = MyRawBuffer(data)
return buf.typed_read(TYPE, offset)
class TestRawBufferTypedWrite(object):
def test_typed_write(self):
expected = struct.pack('=H', 0xABCD) + '\xff' * 6
buf = MyRawBuffer('\xff' * 8, readonly=False)
buf.typed_write(rffi.USHORT, 0, 0xABCD)
assert buf.as_str() == expected
assert buf.typed_read(rffi.USHORT, 0) == 0xABCD
class TestCompiled(BaseTypedReadTest):
cache = {}
def read(self, TYPE, data, offset):
if TYPE not in self.cache:
from rpython.translator.c.test.test_genc import compile
assert isinstance(TYPE, lltype.Primitive)
if TYPE in (lltype.Float, lltype.SingleFloat):
TARGET_TYPE = lltype.Float
else:
TARGET_TYPE = lltype.Signed
def llf(data, offset):
buf = StringBuffer(data)
x = buf.typed_read(TYPE, offset)
return lltype.cast_primitive(TARGET_TYPE, x)
fn = compile(llf, [str, int])
self.cache[TYPE] = fn
#
fn = self.cache[TYPE]
x = fn(data, offset)
return lltype.cast_primitive(TYPE, x)
class _LLBuffer(LLBuffer):
def __del__(self):
lltype.free(self.raw_cdata, flavor='raw')
def make_LLBuffer(size):
buf = lltype.malloc(rffi.CCHARP.TO, size, flavor='raw', zero=True)
return _LLBuffer(buf, size)
# _LLBuffer.__del__ frees buf
@pytest.fixture(params=[RawByteBuffer, ByteBuffer, make_LLBuffer])
def make_buffer(request):
return request.param
def test_basic(make_buffer):
buf = make_buffer(4)
assert buf.getlength() == 4
assert buf.getitem(2) == '\x00'
buf.setitem(0, 'A')
buf.setitem(3, 'Z')
assert buf.as_str() == 'A\x00\x00Z'
def test_typed_write(make_buffer):
buf = make_buffer(4)
buf.typed_write(rffi.USHORT, 0, 0x1234)
buf.typed_write(rffi.USHORT, 2, 0x5678)
expected = struct.pack('HH', 0x1234, 0x5678)
assert buf.as_str() == expected
def test_typed_read(make_buffer):
data = struct.pack('HH', 0x1234, 0x5678)
buf = make_buffer(4)
buf.setslice(0, data)
assert buf.typed_read(rffi.USHORT, 0) == 0x1234
assert buf.typed_read(rffi.USHORT, 2) == 0x5678
def test_getslice_shortcut(make_buffer):
buf = make_buffer(4)
buf.setslice(0, b"data")
buf.getitem = None
assert buf.getslice(0, 1, 2) == b"da" # no crash!
def test_getslice_slowpath(make_buffer):
buf = make_buffer(4)
buf.setslice(0, b"datu")
assert buf.getslice(0, 2, 2) == b"dt"
assert buf.getslice(1, 2, 2) == b"au"
assert buf.getslice(2, -2, 2) == b"td"
assert buf.getslice(3, -2, 2) == b"ua"
def test_getslice_clipped1(make_buffer):
buf = make_buffer(4)
buf.setslice(0, b"data")
buf.getitem = None
assert buf[0:8] == b"data" # no crash!
def test_getslice_clipped2(make_buffer):
buf = make_buffer(4)
buf.setslice(0, b"data")
buf.getitem = None
assert buf[1:8] == b"ata" # no crash!
def test_getslice_open(make_buffer):
buf = make_buffer(4)
buf.setslice(0, b"data")
buf.getitem = None
assert buf[:] == b"data" # no crash!
class TestJIT(LLJitMixin):
def test_GCBuffer_typed_read(self):
from rpython.rlib import jit
DATA = struct.pack('i', 0x12345678)
@jit.dont_look_inside
def make_buffer(flag):
if flag:
buf = ByteBuffer(len(DATA))
buf.setslice(0, DATA)
else:
buf = StringBuffer(DATA)
return buf
def f(flag):
buf = make_buffer(flag)
return buf.typed_read(rffi.INT, 0)
for flag in (0, 1):
res = self.interp_operations(f, [0], supports_singlefloats=True)
#
self.check_operations_history({'call_r': 1,
'guard_no_exception': 1,
'guard_class': 1,
'gc_load_indexed_i': 1,
'finish': 1})
assert res == 0x12345678
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