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author | Victor Stinner <victor.stinner@gmail.com> | 2016-12-15 12:40:53 +0100 |
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committer | Victor Stinner <victor.stinner@gmail.com> | 2016-12-15 12:40:53 +0100 |
commit | bc08ab4598ef05705fd1172f8be8f47307af96c1 (patch) | |
tree | 36d362e23b74d8516d8c5f9001b3966e1c440626 /Include/abstract.h | |
parent | d1e35dd9ee50adf2c69445893ce4e5576b983091 (diff) | |
download | cpython-git-bc08ab4598ef05705fd1172f8be8f47307af96c1.tar.gz |
Add _PY_FASTCALL_SMALL_STACK constant
Issue #28870: Add a new _PY_FASTCALL_SMALL_STACK constant, size of "small
stacks" allocated on the C stack to pass positional arguments to
_PyObject_FastCall().
_PyObject_Call_Prepend() now uses a small stack of 5 arguments (40 bytes)
instead of 8 (64 bytes), since it is modified to use _PY_FASTCALL_SMALL_STACK.
Diffstat (limited to 'Include/abstract.h')
-rw-r--r-- | Include/abstract.h | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/Include/abstract.h b/Include/abstract.h index 8c1e45bb26..f6dfc67585 100644 --- a/Include/abstract.h +++ b/Include/abstract.h @@ -303,6 +303,17 @@ PyAPI_FUNC(PyObject **) _PyStack_UnpackDict( PyObject **kwnames, PyObject *func); +/* Suggested size (number of positional arguments) for arrays of PyObject* + allocated on a C stack to avoid allocating memory on the heap memory. Such + array is used to pass positional arguments to call functions of the + _PyObject_FastCall() family. + + The size is chosen to not abuse the C stack and so limit the risk of stack + overflow. The size is also chosen to allow using the small stack for most + function calls of the Python standard library. On 64-bit CPU, it allocates + 40 bytes on the stack. */ +#define _PY_FASTCALL_SMALL_STACK 5 + /* Call the callable object 'callable' with the "fast call" calling convention: args is a C array for positional arguments (nargs is the number of positional arguments), kwargs is a dictionary for keyword arguments. |