tracemalloc: only use unsigned types to compute hash
Commit to simplify the backport to python 2.7 and to make the code more
consistent.
diff --git a/Modules/_tracemalloc.c b/Modules/_tracemalloc.c
index 95b05d6..7e6113d 100644
--- a/Modules/_tracemalloc.c
+++ b/Modules/_tracemalloc.c
@@ -336,8 +336,7 @@
traceback_hash(traceback_t *traceback)
{
/* code based on tuplehash() of Objects/tupleobject.c */
- Py_uhash_t x; /* Unsigned for defined overflow behavior. */
- Py_hash_t y;
+ Py_uhash_t x, y; /* Unsigned for defined overflow behavior. */
int len = traceback->nframe;
Py_uhash_t mult = _PyHASH_MULTIPLIER;
frame_t *frame;
@@ -345,13 +344,13 @@
x = 0x345678UL;
frame = traceback->frames;
while (--len >= 0) {
- y = PyObject_Hash(frame->filename);
- y ^= frame->lineno;
+ y = (Py_uhash_t)PyObject_Hash(frame->filename);
+ y ^= (Py_uhash_t)frame->lineno;
frame++;
x = (x ^ y) * mult;
/* the cast might truncate len; that doesn't change hash stability */
- mult += (Py_hash_t)(82520UL + len + len);
+ mult += (Py_uhash_t)(82520UL + len + len);
}
x += 97531UL;
return x;