Author: Armin Rigo <[email protected]>
Branch:
Changeset: r53149:7c1747e11e4a
Date: 2012-03-03 19:37 +0100
http://bitbucket.org/pypy/pypy/changeset/7c1747e11e4a/
Log: Comment.
diff --git a/pypy/rpython/lltypesystem/rstr.py
b/pypy/rpython/lltypesystem/rstr.py
--- a/pypy/rpython/lltypesystem/rstr.py
+++ b/pypy/rpython/lltypesystem/rstr.py
@@ -62,6 +62,14 @@
@jit.oopspec('stroruni.copy_contents(src, dst, srcstart, dststart,
length)')
@enforceargs(None, None, int, int, int)
def copy_string_contents(src, dst, srcstart, dststart, length):
+ """Copies 'length' characters from the 'src' string to the 'dst'
+ string, starting at position 'srcstart' and 'dststart'."""
+ # xxx Warning: don't try to do this at home. It relies on a lot
+ # of details to be sure that it works correctly in all cases.
+ # Notably: no GC operation at all from the first cast_ptr_to_adr()
+ # because it might move the strings. The keepalive_until_here()
+ # are obscurely essential to make sure that the strings stay alive
+ # longer than the raw_memcopy().
assert srcstart >= 0
assert dststart >= 0
assert length >= 0
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