Author: Antonio Cuni <anto.c...@gmail.com>
Branch: faster-rstruct-2
Changeset: r91268:77c4134d96d9
Date: 2017-05-12 17:36 +0200
http://bitbucket.org/pypy/pypy/changeset/77c4134d96d9/
Log: implement MutableStringBuffer.typed_write
diff --git a/rpython/rlib/mutbuffer.py b/rpython/rlib/mutbuffer.py
--- a/rpython/rlib/mutbuffer.py
+++ b/rpython/rlib/mutbuffer.py
@@ -1,7 +1,8 @@
-from rpython.rtyper.lltypesystem import lltype
+from rpython.rtyper.lltypesystem import lltype, llmemory
from rpython.rtyper.lltypesystem.lloperation import llop
from rpython.rtyper.lltypesystem.rstr import STR, mallocstr
from rpython.rtyper.annlowlevel import llstr, hlstr
+from rpython.rlib.objectmodel import specialize
from rpython.rlib.buffer import Buffer
class MutableStringBuffer(Buffer):
@@ -48,3 +49,12 @@
def setzeros(self, index, count):
for i in range(index, index+count):
self.setitem(i, '\x00')
+
+ @specialize.ll_and_arg(1)
+ def typed_write(self, TP, byte_offset, value):
+ base_ofs = (llmemory.offsetof(STR, 'chars') +
+ llmemory.itemoffsetof(STR.chars, 0))
+ scale_factor = llmemory.sizeof(lltype.Char)
+ value = lltype.cast_primitive(TP, value)
+ llop.gc_store_indexed(lltype.Void, self.ll_val, byte_offset, value,
+ scale_factor, base_ofs)
diff --git a/rpython/rlib/test/test_mutbuffer.py
b/rpython/rlib/test/test_mutbuffer.py
--- a/rpython/rlib/test/test_mutbuffer.py
+++ b/rpython/rlib/test/test_mutbuffer.py
@@ -1,4 +1,6 @@
import pytest
+import struct
+from rpython.rtyper.lltypesystem import lltype, rffi
from rpython.rlib.mutbuffer import MutableStringBuffer
class TestMutableStringBuffer(object):
@@ -28,3 +30,13 @@
buf.setslice(0, 'ABCDEFGH')
buf.setzeros(2, 3)
assert buf.finish() == 'AB\x00\x00\x00FGH'
+
+ def test_typed_write(self):
+ expected = struct.pack('ifqd', 0x1234, 123.456, 0x12345678, 789.123)
+ buf = MutableStringBuffer(24)
+ buf.typed_write(rffi.INT, 0, 0x1234)
+ buf.typed_write(rffi.FLOAT, 4, 123.456)
+ buf.typed_write(rffi.LONGLONG, 8, 0x12345678)
+ buf.typed_write(rffi.DOUBLE, 16, 789.123)
+ s = buf.finish()
+ assert s == expected
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