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bpo-43688: Support the limited C API in debug mode (GH-25131)

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The limited C API is now supported if Python is built in debug mode
(if the Py_DEBUG macro is defined). In the limited C API, the
Py_INCREF() and Py_DECREF() functions are now implemented as opaque
function calls, rather than accessing directly the PyObject.ob_refcnt
member, if Python is built in debug mode and the Py_LIMITED_API macro
targets Python 3.10 or newer. It became possible to support the
limited C API in debug mode because the PyObject structure is the
same in release and debug mode since Python 3.8 (see bpo-36465).

The limited C API is still not supported in the --with-trace-refs
special build (Py_TRACE_REFS macro).
This commit is contained in:
Victor Stinner 2021-04-02 15:45:37 +02:00 • committed by GitHub
parent 442ad74fc2
commit 3359cab038
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6 changed files with 82 additions and 25 deletions
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16
setup.py
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@ -1864,17 +1864,11 @@ class PyBuildExt(build_ext):
## # Uncomment these lines if you want to play with xxmodule.c
## self.add(Extension('xx', ['xxmodule.c']))
if 'd' not in sysconfig.get_config_var('ABIFLAGS'):
# Non-debug mode: Build xxlimited with limited API
self.add(Extension('xxlimited', ['xxlimited.c'],
define_macros=[('Py_LIMITED_API', '0x030a0000')]))
self.add(Extension('xxlimited_35', ['xxlimited_35.c'],
define_macros=[('Py_LIMITED_API', '0x03050000')]))
else:
# Debug mode: Build xxlimited with the full API
# (which is compatible with the limited one)
self.add(Extension('xxlimited', ['xxlimited.c']))
self.add(Extension('xxlimited_35', ['xxlimited_35.c']))
# Limited C API
self.add(Extension('xxlimited', ['xxlimited.c'],
define_macros=[('Py_LIMITED_API', '0x030a0000')]))
self.add(Extension('xxlimited_35', ['xxlimited_35.c'],
define_macros=[('Py_LIMITED_API', '0x03050000')]))
def detect_tkinter_fromenv(self):
# Build _tkinter using the Tcl/Tk locations specified by