diff options
Diffstat (limited to 'Misc')
| -rw-r--r-- | Misc/SpecialBuilds.txt | 17 |
1 files changed, 13 insertions, 4 deletions
diff --git a/Misc/SpecialBuilds.txt b/Misc/SpecialBuilds.txt index a4226c9..a3d3558 100644 --- a/Misc/SpecialBuilds.txt +++ b/Misc/SpecialBuilds.txt @@ -34,10 +34,14 @@ Py_TRACE_REFS introduced in 1.4 Turn on heavy reference debugging. This is major surgery. Every PyObject grows two more pointers, to maintain a doubly-linked list of all live -heap-allocated objects (note that, e.g., most builtin type objects are not -in this list, as they're statically allocated). Note that because the -fundamental PyObject layout changes, Python modules compiled with -Py_TRACE_REFS are incompatible with modules compiled without it. +heap-allocated objects. Most builtin type objects are not in this list, +as they're statically allocated. Starting in Python 2.3, if COUNT_ALLOCS +(see below) is also defined, a static type object T does appear in this +list if at least one object of type T has been created. + +Note that because the fundamental PyObject layout changes, Python modules +compiled with Py_TRACE_REFS are incompatible with modules compiled without +it. Py_TRACE_REFS implies Py_REF_DEBUG. @@ -171,6 +175,11 @@ because of this; this was fixed in 2.2.2. Use of COUNT_ALLOCS makes all heap-allocated type objects immortal, except for those for which no object of that type is ever allocated. +Starting with Python 2.3, If Py_TRACE_REFS is also defined, COUNT_ALLOCS +arranges to ensure that the type object for each allocated object +appears in the doubly-linked list of all objects maintained by +Py_TRACE_REFS. + Special gimmicks: sys.getcounts() |