6588413: Use -fvisibility=hidden for gcc compiles

Add option for gcc 4 and above, define JNIEXPORT and JNIIMPORT to visibility=default, add for jio_snprintf and others since -fvisibility=hidden overrides --version-script definitions.

Reviewed-by: kamg, never

hotspot/make/linux/makefiles/gcc.make

@@ -75,6 +75,11 @@ CFLAGS += -fno-rtti
 CFLAGS += -fno-exceptions
 CFLAGS += -D_REENTRANT
 CFLAGS += -fcheck-new
+# version 4 and above support fvisibility=hidden (matches jni_x86.h file)
+# except 4.1.2 gives pointless warnings that can't be disabled (afaik)
+ifneq "$(shell expr \( $(CC_VER_MAJOR) \> 4 \) \| \( \( $(CC_VER_MAJOR) = 4 \) \& \( $(CC_VER_MINOR) \>= 3 \) \))" "0"
+CFLAGS += -fvisibility=hidden
+endif
 
 ARCHFLAG = $(ARCHFLAG/$(BUILDARCH))
 ARCHFLAG/i486    = -m32 -march=i586

hotspot/make/linux/makefiles/mapfile-vers-debug

@@ -262,14 +262,6 @@ SUNWprivate_1.1 {
                 JVM_SetField;
                 JVM_SetPrimitiveField;
 
-                # Needed for dropping VM into JDK 1.3.x, 1.4
-                _JVM_native_threads;
-                jdk_sem_init;
-                jdk_sem_post;
-                jdk_sem_wait;
-                jdk_pthread_sigmask;
-                jdk_waitpid;
-
                 # debug JVM
                 JVM_AccessVMBooleanFlag;
                 JVM_AccessVMIntFlag;

hotspot/make/linux/makefiles/mapfile-vers-product

@@ -262,14 +262,6 @@ SUNWprivate_1.1 {
                 JVM_SetField;
                 JVM_SetPrimitiveField;
 
-                # Needed for dropping VM into JDK 1.3.x, 1.4
-                _JVM_native_threads;
-                jdk_sem_init;
-                jdk_sem_post;
-                jdk_sem_wait;
-                jdk_pthread_sigmask;
-                jdk_waitpid;
-
                 # miscellaneous functions
                 jio_fprintf;
                 jio_printf;

hotspot/src/cpu/sparc/vm/jni_sparc.h

@@ -23,8 +23,13 @@
  * questions.
  */
 
-#define JNIEXPORT
-#define JNIIMPORT
+#if defined(__GNUC__) && (__GNUC__ >= 4)
+  #define JNIEXPORT     __attribute__((visibility("default")))
+  #define JNIIMPORT     __attribute__((visibility("default")))
+#else
+  #define JNIEXPORT
+  #define JNIIMPORT
+#endif
 #define JNICALL
 
 typedef int jint;

hotspot/src/cpu/x86/vm/jni_x86.h

@@ -27,10 +27,16 @@
 #define _JAVASOFT_JNI_MD_H_
 
 #if defined(SOLARIS) || defined(LINUX)
+
+#if defined(__GNUC__) && (__GNUC__ > 4) || (__GNUC__ == 4) && (__GNUC_MINOR__ > 2)
+  #define JNIEXPORT     __attribute__((visibility("default")))
+  #define JNIIMPORT     __attribute__((visibility("default")))
+#else
   #define JNIEXPORT
   #define JNIIMPORT
-  #define JNICALL
+#endif
 
+  #define JNICALL
   typedef int jint;
 
 #ifdef _LP64

hotspot/src/cpu/zero/vm/jni_zero.h

@@ -24,8 +24,14 @@
  * questions.
  */
 
-#define JNIEXPORT
-#define JNIIMPORT
+
+#if defined(__GNUC__) && (__GNUC__ >= 4)
+  #define JNIEXPORT     __attribute__((visibility("default")))
+  #define JNIIMPORT     __attribute__((visibility("default")))
+#else
+  #define JNIEXPORT
+  #define JNIIMPORT
+#endif
 #define JNICALL
 
 typedef int jint;

hotspot/src/os/linux/vm/jvm_linux.cpp

@@ -29,11 +29,6 @@
 
 #include <signal.h>
 
-/*
- * FIXME: This is temporary hack to keep Linux Runtime.exec()
- * code happy. See $JDK/src/linux/native/java/lang/UnixProcess_md.c
- */
-int _JVM_native_threads = 1;
 
 // sun.misc.Signal ///////////////////////////////////////////////////////////
 // Signal code is mostly copied from classic vm, signals_md.c   1.4 98/08/23

hotspot/src/os/linux/vm/os_linux.cpp

@@ -2509,8 +2509,10 @@ char *os::scan_pages(char *start, char* end, page_info* page_expected, page_info
   return end;
 }
 
-extern "C" void numa_warn(int number, char *where, ...) { }
-extern "C" void numa_error(char *where) { }
+// Something to do with the numa-aware allocator needs these symbols
+extern "C" JNIEXPORT void numa_warn(int number, char *where, ...) { }
+extern "C" JNIEXPORT void numa_error(char *where) { }
+extern "C" JNIEXPORT int fork1() { return fork(); }
 
 
 // If we are running with libnuma version > 2, then we should
@@ -3483,7 +3485,7 @@ bool os::is_interrupted(Thread* thread, bool clear_interrupted) {
 // Note that the VM will print warnings if it detects conflicting signal
 // handlers, unless invoked with the option "-XX:+AllowUserSignalHandlers".
 //
-extern "C" int
+extern "C" JNIEXPORT int
 JVM_handle_linux_signal(int signo, siginfo_t* siginfo,
                         void* ucontext, int abort_if_unrecognized);
 
@@ -4678,44 +4680,6 @@ void os::pause() {
   }
 }
 
-extern "C" {
-
-/**
- * NOTE: the following code is to keep the green threads code
- * in the libjava.so happy. Once the green threads is removed,
- * these code will no longer be needed.
- */
-int
-jdk_waitpid(pid_t pid, int* status, int options) {
-    return waitpid(pid, status, options);
-}
-
-int
-fork1() {
-    return fork();
-}
-
-int
-jdk_sem_init(sem_t *sem, int pshared, unsigned int value) {
-    return sem_init(sem, pshared, value);
-}
-
-int
-jdk_sem_post(sem_t *sem) {
-    return sem_post(sem);
-}
-
-int
-jdk_sem_wait(sem_t *sem) {
-    return sem_wait(sem);
-}
-
-int
-jdk_pthread_sigmask(int how , const sigset_t* newmask, sigset_t* oldmask) {
-    return pthread_sigmask(how , newmask, oldmask);
-}
-
-}
 
 // Refer to the comments in os_solaris.cpp park-unpark.
 //

hotspot/src/os/solaris/vm/os_solaris.cpp

@@ -4221,7 +4221,9 @@ void os::os_exception_wrapper(java_call_t f, JavaValue* value, methodHandle* met
 // Note that the VM will print warnings if it detects conflicting signal
 // handlers, unless invoked with the option "-XX:+AllowUserSignalHandlers".
 //
-extern "C" int JVM_handle_solaris_signal(int signo, siginfo_t* siginfo, void* ucontext, int abort_if_unrecognized);
+extern "C" JNIEXPORT int
+JVM_handle_solaris_signal(int signo, siginfo_t* siginfo, void* ucontext,
+                          int abort_if_unrecognized);
 
 
 void signalHandler(int sig, siginfo_t* info, void* ucVoid) {

hotspot/src/os_cpu/linux_sparc/vm/os_linux_sparc.cpp

@@ -542,7 +542,7 @@ inline static bool checkICMiss(sigcontext* uc, address* pc, address* stub) {
   return false;
 }
 
-extern "C" int
+extern "C" JNIEXPORT int
 JVM_handle_linux_signal(int sig,
                         siginfo_t* info,
                         void* ucVoid,

hotspot/src/os_cpu/linux_x86/vm/os_linux_x86.cpp

@@ -216,7 +216,7 @@ extern "C" void FetchNPFI () ;
 extern "C" void FetchNResume () ;
 #endif // AMD64
 
-extern "C" int
+extern "C" JNIEXPORT int
 JVM_handle_linux_signal(int sig,
                         siginfo_t* info,
                         void* ucVoid,

hotspot/src/os_cpu/linux_zero/vm/os_linux_zero.cpp

@@ -116,7 +116,7 @@ frame os::fetch_frame_from_context(void* ucVoid) {
   ShouldNotCallThis();
 }
 
-extern "C" int
+extern "C" JNIEXPORT int
 JVM_handle_linux_signal(int sig,
                         siginfo_t* info,
                         void* ucVoid,

hotspot/src/os_cpu/solaris_sparc/vm/os_solaris_sparc.cpp

@@ -317,9 +317,9 @@ extern "C" void Fetch32Resume () ;
 extern "C" void FetchNPFI () ;
 extern "C" void FetchNResume () ;
 
-extern "C" int JVM_handle_solaris_signal(int signo, siginfo_t* siginfo, void* ucontext, int abort_if_unrecognized);
-
-int JVM_handle_solaris_signal(int sig, siginfo_t* info, void* ucVoid, int abort_if_unrecognized) {
+extern "C" JNIEXPORT int
+JVM_handle_solaris_signal(int sig, siginfo_t* info, void* ucVoid,
+                          int abort_if_unrecognized) {
   ucontext_t* uc = (ucontext_t*) ucVoid;
 
   Thread* t = ThreadLocalStorage::get_thread_slow();

hotspot/src/os_cpu/solaris_x86/vm/os_solaris_x86.cpp

@@ -365,8 +365,6 @@ bool os::is_allocatable(size_t bytes) {
 
 }
 
-extern "C" int JVM_handle_solaris_signal(int signo, siginfo_t* siginfo, void* ucontext, int abort_if_unrecognized);
-
 extern "C" void Fetch32PFI () ;
 extern "C" void Fetch32Resume () ;
 #ifdef AMD64
@@ -374,7 +372,9 @@ extern "C" void FetchNPFI () ;
 extern "C" void FetchNResume () ;
 #endif // AMD64
 
-int JVM_handle_solaris_signal(int sig, siginfo_t* info, void* ucVoid, int abort_if_unrecognized) {
+extern "C" JNIEXPORT int
+JVM_handle_solaris_signal(int sig, siginfo_t* info, void* ucVoid,
+                          int abort_if_unrecognized) {
   ucontext_t* uc = (ucontext_t*) ucVoid;
 
 #ifndef AMD64

hotspot/src/share/vm/prims/forte.cpp

@@ -520,6 +520,7 @@ static void forte_fill_call_trace_given_top(JavaThread* thd,
 //       method_id - jmethodID of the method being executed
 
 extern "C" {
+JNIEXPORT
 void AsyncGetCallTrace(ASGCT_CallTrace *trace, jint depth, void* ucontext) {
 
 // This is if'd out because we no longer use thread suspension.

hotspot/src/share/vm/prims/jvm.cpp

@@ -2585,7 +2585,7 @@ int jio_vfprintf(FILE* f, const char *fmt, va_list args) {
 }
 
 
-int jio_printf(const char *fmt, ...) {
+JNIEXPORT int jio_printf(const char *fmt, ...) {
   int len;
   va_list args;
   va_start(args, fmt);

hotspot/src/share/vm/prims/jvm.h

@@ -1417,16 +1417,16 @@ JVM_GetHostName(char* name, int namelen);
  * BE CAREFUL! The following functions do not implement the
  * full feature set of standard C printf formats.
  */
-int
+JNIEXPORT int
 jio_vsnprintf(char *str, size_t count, const char *fmt, va_list args);
 
-int
+JNIEXPORT int
 jio_snprintf(char *str, size_t count, const char *fmt, ...);
 
-int
+JNIEXPORT int
 jio_fprintf(FILE *, const char *fmt, ...);
 
-int
+JNIEXPORT int
 jio_vfprintf(FILE *, const char *fmt, va_list args);