port: advance MSVC600 CPython compatibility frontier

2026-08-22 17:36:38 +00:00
parent a7a9560e5c
commit 824b4f0d24
15 changed files with 6150 additions and 41 deletions
@@ -0,0 +1,76 @@
+/* Focused compile smoke test for compat/msvc600/stdint.h.
+ *
+ * The VC6 compatibility header forwards to the existing
+ * compat/msvc600/inttypes.h typedefs. This fixture exercises exactly the
+ * subset that cpython/Modules/_blake2/impl/blake2-impl.h needs: uint8_t,
+ * uint32_t, and uint64_t, in the same load/store/rotate shapes that file
+ * uses, plus a compile-time width check for each. It also includes
+ * <inttypes.h> alongside <stdint.h> in the same translation unit, the way
+ * a Python.h + blake2.h translation unit would, to guard against the
+ * duplicate-typedef failure mode the stdint.h header is designed to avoid.
+ */
+#include <stddef.h>
+#include <stdint.h>
+#include <inttypes.h>
+#include <string.h>
+
+typedef char vc6_stdint_check_uint8_is_1_byte[(sizeof(uint8_t) == 1) ? 1 : -1];
+typedef char vc6_stdint_check_uint32_is_4_bytes[(sizeof(uint32_t) == 4) ? 1 : -1];
+typedef char vc6_stdint_check_uint64_is_8_bytes[(sizeof(uint64_t) == 8) ? 1 : -1];
+
+static uint32_t
+vc6_stdint_load32(const void *src)
+{
+    const uint8_t *p = (const uint8_t *)src;
+    uint32_t w = *p++;
+    w |= ((uint32_t)(*p++)) << 8;
+    w |= ((uint32_t)(*p++)) << 16;
+    w |= ((uint32_t)(*p++)) << 24;
+    return w;
+}
+
+static uint64_t
+vc6_stdint_load64(const void *src)
+{
+    const uint8_t *p = (const uint8_t *)src;
+    uint64_t w = *p++;
+    w |= ((uint64_t)(*p++)) << 8;
+    w |= ((uint64_t)(*p++)) << 16;
+    w |= ((uint64_t)(*p++)) << 24;
+    w |= ((uint64_t)(*p++)) << 32;
+    w |= ((uint64_t)(*p++)) << 40;
+    w |= ((uint64_t)(*p++)) << 48;
+    w |= ((uint64_t)(*p++)) << 56;
+    return w;
+}
+
+static uint32_t
+vc6_stdint_rotl32(const uint32_t w, const unsigned c)
+{
+    return (w << c) | (w >> (32 - c));
+}
+
+static uint64_t
+vc6_stdint_rotl64(const uint64_t w, const unsigned c)
+{
+    return (w << c) | (w >> (64 - c));
+}
+
+int
+vc6_stdint_smoke(void)
+{
+    static const uint8_t bytes32[4] = { 0x01, 0x02, 0x03, 0x04 };
+    static const uint8_t bytes64[8] = { 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08 };
+    uint32_t w32;
+    uint64_t w64;
+    int ok;
+
+    w32 = vc6_stdint_load32(bytes32);
+    w64 = vc6_stdint_load64(bytes64);
+
+    ok = 1;
+    ok = ok && (w32 == 0x04030201UL);
+    ok = ok && (vc6_stdint_rotl32(w32, 8) == ((w32 << 8) | (w32 >> 24)));
+    ok = ok && (vc6_stdint_rotl64(w64, 8) == ((w64 << 8) | (w64 >> 56)));
+    return ok ? 0 : 1;
+}