This patch addresses two main issues: (1) There exist some non-fatal
errors in some of the hash algorithms. For exmaple, in float_hash and
complex_hash a certain part of the value is not included in the hash
calculation. See Tim's, Guido's, and my discussion of this on
python-dev in May under the title "fix float_hash and complex_hash for
64-bit *nix"
(2) The hash algorithms that use pointers (e.g. func_hash, code_hash)
are universally not correct on Win64 (they assume that sizeof(long) ==
sizeof(void*))
As well, this patch significantly cleans up the hash code. It adds the
two function _Py_HashDouble and _PyHash_VoidPtr that the various
hashing routine are changed to use.
These help maintain the hash function invariant: (a==b) =>
(hash(a)==hash(b))) I have added Lib/test/test_hash.py and
Lib/test/output/test_hash to test this for some cases.
diff --git a/Include/object.h b/Include/object.h
index 2250b7f..20757be 100644
--- a/Include/object.h
+++ b/Include/object.h
@@ -293,6 +293,10 @@
/* tstate dict key for PyObject_Compare helper */
extern PyObject *_PyCompareState_Key;
+/* Helpers for hash functions */
+extern DL_IMPORT(long) _Py_HashDouble Py_PROTO((double));
+extern DL_IMPORT(long) _Py_HashPointer Py_PROTO((void*));
+
/* Flag bits for printing: */
#define Py_PRINT_RAW 1 /* No string quotes etc. */