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src/java.base/share/native/libjava/sizecalc.h

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@@ -42,11 +42,11 @@
 /* http://stackoverflow.com/questions/3472311/what-is-a-portable-method-to-find-the-maximum-value-of-size-t */
 #ifndef SIZE_MAX
 #define SIZE_MAX ((size_t)-1)
 #endif
 
-#define IS_SAFE_SIZE_T(x) ((x) >= 0 && (unsigned long long)(x) <= SIZE_MAX)
+#define IS_SAFE_SIZE_T(x) (((x) + 1) > 0 && (unsigned long long)(x) - 1u < SIZE_MAX)
 
 #define IS_SAFE_SIZE_MUL(m, n) \
     (IS_SAFE_SIZE_T(m) && IS_SAFE_SIZE_T(n) && ((m) == 0 || (n) == 0 || (size_t)(n) <= (SIZE_MAX / (size_t)(m))))
 
 #define IS_SAFE_SIZE_ADD(a, b) \
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