Author: Armin Rigo <[email protected]>
Branch: cpyext-gc-support
Changeset: r80173:6bf5e57af9d4
Date: 2015-10-13 20:52 +0200
http://bitbucket.org/pypy/pypy/changeset/6bf5e57af9d4/
Log: Further notes
diff --git a/pypy/doc/discussion/rawrefcount.rst
b/pypy/doc/discussion/rawrefcount.rst
--- a/pypy/doc/discussion/rawrefcount.rst
+++ b/pypy/doc/discussion/rawrefcount.rst
@@ -22,7 +22,7 @@
Makes a link from an existing PyObject structure 'ob' to a newly
allocated W_CPyExtPlaceHolderObject 'p'. The 'p' should have a
- back reference field pointing to 'ob'. This also adds
+ back-reference field pointing to 'ob'. This also adds
REFCNT_FROM_PYPY_OBJECT to ob->ob_refcnt.
rawrefcount_from_obj(p)
@@ -96,3 +96,18 @@
extra garbage entries after some minor collections. It is cleaned up
by being rebuilt at the next major collection. We never walk all
items of that dict; we only walk the two explicit P lists.
+
+
+Further notes
+-------------
+
+For small immutable types like <int> and <float>, we can actually
+create a PyIntObject as a complete copy of the W_IntObject whenever
+asked, and not record any link. Is it cheaper? Unclear.
+
+A few special types need to be reflected both as PyPy objects and
+PyObjects. For now we assume that these are large and mostly
+immutable, like <type> objects. They should be linked in the O list,
+and we'll ignore the issues of deallocation ordering for them. (Also,
+W_TypeObject can have a back-reference field like
+W_CPyExtPlaceHolderObject.)
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