port: add MSVC600 CPython compatibility layer

2026-08-17 17:35:32 +00:00
parent 3f15bfa5f7
commit a7a9560e5c
13 changed files with 2652 additions and 35 deletions
@@ -0,0 +1,36 @@
+/* Focused, isolated compile smoke test for Include/internal/pycore_atomic.h
+ * under VC6/_M_IX86.
+ *
+ * Deliberately does NOT go through Python.h or any other pycore_*.h header:
+ * pycore_interp.h (reached transitively from a real core translation unit
+ * like Modules/main.c) additionally requires <stdbool.h>, a separate,
+ * unrelated VC6 gap tracked in PORT_STATUS.md. Isolating pycore_atomic.h
+ * here keeps this probe's result attributable to the atomics compatibility
+ * work specifically.
+ *
+ * Py_BUILD_CORE is supplied by the probe script (/D Py_BUILD_CORE), the
+ * same way it is for a real core translation unit. <inttypes.h> (resolved
+ * to compat/msvc600/inttypes.h for VC6 via the include path) provides
+ * uintptr_t, which pycore_atomic.h needs but does not itself include; in
+ * a real build this comes from Python.h/pyport.h, included ahead of any
+ * pycore_*.h header.
+ */
+#include <inttypes.h>
+#include "pycore_atomic.h"
+
+static _Py_atomic_int atomic_int_value;
+static _Py_atomic_address atomic_addr_value;
+
+int
+vc6_atomic_smoke(void)
+{
+    _Py_atomic_store(&atomic_int_value, 1);
+    _Py_atomic_store_relaxed(&atomic_int_value, 2);
+    _Py_atomic_store(&atomic_addr_value, (uintptr_t)0);
+    _Py_atomic_store_relaxed(&atomic_addr_value, (uintptr_t)1);
+
+    return _Py_atomic_load(&atomic_int_value)
+         + _Py_atomic_load_relaxed(&atomic_int_value)
+         + (int)_Py_atomic_load(&atomic_addr_value)
+         + (int)_Py_atomic_load_relaxed(&atomic_addr_value);
+}