8313396: Portable implementation of FORBID_C_FUNCTION and ALLOW_C_FUNCTION

src/hotspot/os/aix/loadlib_aix.cpp

@@ -74,9 +74,7 @@ class StringList {
       }
     }
     assert0(_cap > _num);
-    BEGIN_ALLOW_FORBIDDEN_FUNCTIONS // Temp. until use of forbidden ::strdup fixed.
-    char* s2 = ::strdup(s);
-    END_ALLOW_FORBIDDEN_FUNCTIONS
+    char* s2 = permit_forbidden_function::strdup(s);
     if (!s2) {
       return nullptr;
     }

src/hotspot/share/utilities/forbiddenFunctions.hpp

@@ -31,7 +31,11 @@
 #include <stddef.h> // for size_t
 #include <stdlib.h> // clang workaround for exit, _exit, _Exit - see FORBID macro.
 
-#include OS_HEADER(forbiddenFunctions)
+#ifdef _WINDOWS
+#include "forbiddenFunctions_windows.hpp"
+#else
+#include "forbiddenFunctions_posix.hpp"
+#endif
 
 // Forbid the use of various C library functions.  Some of these have os::
 // replacements that should be used instead.  Others are considered obsolete

src/hotspot/share/utilities/permitForbiddenFunctions.hpp

@@ -61,6 +61,8 @@ inline void free(void* ptr) { return ::free(ptr); }
 inline void* calloc(size_t nmemb, size_t size) { return ::calloc(nmemb, size); }
 inline void* realloc(void* ptr, size_t size) { return ::realloc(ptr, size); }
 
+inline char* strdup(const char* s) { return ::strdup(s); }
+
 END_ALLOW_FORBIDDEN_FUNCTIONS
 } // namespace permit_forbidden_function