8028785: [parfait] warnings from b116 for hotspot.src.share.vm.prims: JNI exception pending

Summary: added JNI exception pending check in several files under src/share/vm/prims directory
Reviewed-by: coleenp, minqi

src/share/vm/prims/jni.cpp

@@ -4450,8 +4450,23 @@ static bool initializeDirectBufferSupport(JNIEnv* env, JavaThread* thread) {
 
     // Get needed field and method IDs
     directByteBufferConstructor = env->GetMethodID(directByteBufferClass, "<init>", "(JI)V");
+    if (env->ExceptionCheck()) {
+      env->ExceptionClear();
+      directBufferSupportInitializeFailed = 1;
+      return false;
+    }
     directBufferAddressField    = env->GetFieldID(bufferClass, "address", "J");
+    if (env->ExceptionCheck()) {
+      env->ExceptionClear();
+      directBufferSupportInitializeFailed = 1;
+      return false;
+    }
     bufferCapacityField         = env->GetFieldID(bufferClass, "capacity", "I");
+    if (env->ExceptionCheck()) {
+      env->ExceptionClear();
+      directBufferSupportInitializeFailed = 1;
+      return false;
+    }
 
     if ((directByteBufferConstructor == NULL) ||
         (directBufferAddressField    == NULL) ||

src/share/vm/prims/unsafe.cpp

@@ -858,6 +858,11 @@ static inline void throw_new(JNIEnv *env, const char *ename) {
   strcpy(buf, "java/lang/");
   strcat(buf, ename);
   jclass cls = env->FindClass(buf);
+  if (env->ExceptionCheck()) {
+    env->ExceptionClear();
+    tty->print_cr("Unsafe: cannot throw %s because FindClass has failed", buf);
+    return;
+  }
   char* msg = NULL;
   env->ThrowNew(cls, msg);
 }

src/share/vm/prims/whitebox.cpp

@@ -316,9 +316,10 @@ WB_END
 
 WB_ENTRY(jint, WB_DeoptimizeMethod(JNIEnv* env, jobject o, jobject method, jboolean is_osr))
   jmethodID jmid = reflected_method_to_jmid(thread, env, method);
+  int result = 0;
+  CHECK_JNI_EXCEPTION_(env, result);
   MutexLockerEx mu(Compile_lock);
   methodHandle mh(THREAD, Method::checked_resolve_jmethod_id(jmid));
-  int result = 0;
   nmethod* code;
   if (is_osr) {
     int bci = InvocationEntryBci;
@@ -344,6 +345,7 @@ WB_END
 
 WB_ENTRY(jboolean, WB_IsMethodCompiled(JNIEnv* env, jobject o, jobject method, jboolean is_osr))
   jmethodID jmid = reflected_method_to_jmid(thread, env, method);
+  CHECK_JNI_EXCEPTION_(env, JNI_FALSE);
   MutexLockerEx mu(Compile_lock);
   methodHandle mh(THREAD, Method::checked_resolve_jmethod_id(jmid));
   nmethod* code = is_osr ? mh->lookup_osr_nmethod_for(InvocationEntryBci, CompLevel_none, false) : mh->code();
@@ -355,6 +357,7 @@ WB_END
 
 WB_ENTRY(jboolean, WB_IsMethodCompilable(JNIEnv* env, jobject o, jobject method, jint comp_level, jboolean is_osr))
   jmethodID jmid = reflected_method_to_jmid(thread, env, method);
+  CHECK_JNI_EXCEPTION_(env, JNI_FALSE);
   MutexLockerEx mu(Compile_lock);
   methodHandle mh(THREAD, Method::checked_resolve_jmethod_id(jmid));
   if (is_osr) {
@@ -366,6 +369,7 @@ WB_END
 
 WB_ENTRY(jboolean, WB_IsMethodQueuedForCompilation(JNIEnv* env, jobject o, jobject method))
   jmethodID jmid = reflected_method_to_jmid(thread, env, method);
+  CHECK_JNI_EXCEPTION_(env, JNI_FALSE);
   MutexLockerEx mu(Compile_lock);
   methodHandle mh(THREAD, Method::checked_resolve_jmethod_id(jmid));
   return mh->queued_for_compilation();
@@ -373,6 +377,7 @@ WB_END
 
 WB_ENTRY(jint, WB_GetMethodCompilationLevel(JNIEnv* env, jobject o, jobject method, jboolean is_osr))
   jmethodID jmid = reflected_method_to_jmid(thread, env, method);
+  CHECK_JNI_EXCEPTION_(env, CompLevel_none);
   methodHandle mh(THREAD, Method::checked_resolve_jmethod_id(jmid));
   nmethod* code = is_osr ? mh->lookup_osr_nmethod_for(InvocationEntryBci, CompLevel_none, false) : mh->code();
   return (code != NULL ? code->comp_level() : CompLevel_none);
@@ -380,6 +385,7 @@ WB_END
 
 WB_ENTRY(void, WB_MakeMethodNotCompilable(JNIEnv* env, jobject o, jobject method, jint comp_level, jboolean is_osr))
   jmethodID jmid = reflected_method_to_jmid(thread, env, method);
+  CHECK_JNI_EXCEPTION(env);
   methodHandle mh(THREAD, Method::checked_resolve_jmethod_id(jmid));
   if (is_osr) {
     mh->set_not_osr_compilable(comp_level, true /* report */, "WhiteBox");
@@ -390,6 +396,7 @@ WB_END
 
 WB_ENTRY(jint, WB_GetMethodEntryBci(JNIEnv* env, jobject o, jobject method))
   jmethodID jmid = reflected_method_to_jmid(thread, env, method);
+  CHECK_JNI_EXCEPTION_(env, InvocationEntryBci);
   methodHandle mh(THREAD, Method::checked_resolve_jmethod_id(jmid));
   nmethod* code = mh->lookup_osr_nmethod_for(InvocationEntryBci, CompLevel_none, false);
   return (code != NULL && code->is_osr_method() ? code->osr_entry_bci() : InvocationEntryBci);
@@ -397,6 +404,7 @@ WB_END
 
 WB_ENTRY(jboolean, WB_TestSetDontInlineMethod(JNIEnv* env, jobject o, jobject method, jboolean value))
   jmethodID jmid = reflected_method_to_jmid(thread, env, method);
+  CHECK_JNI_EXCEPTION_(env, JNI_FALSE);
   methodHandle mh(THREAD, Method::checked_resolve_jmethod_id(jmid));
   bool result = mh->dont_inline();
   mh->set_dont_inline(value == JNI_TRUE);
@@ -414,6 +422,7 @@ WB_END
 
 WB_ENTRY(jboolean, WB_TestSetForceInlineMethod(JNIEnv* env, jobject o, jobject method, jboolean value))
   jmethodID jmid = reflected_method_to_jmid(thread, env, method);
+  CHECK_JNI_EXCEPTION_(env, JNI_FALSE);
   methodHandle mh(THREAD, Method::checked_resolve_jmethod_id(jmid));
   bool result = mh->force_inline();
   mh->set_force_inline(value == JNI_TRUE);
@@ -422,6 +431,7 @@ WB_END
 
 WB_ENTRY(jboolean, WB_EnqueueMethodForCompilation(JNIEnv* env, jobject o, jobject method, jint comp_level, jint bci))
   jmethodID jmid = reflected_method_to_jmid(thread, env, method);
+  CHECK_JNI_EXCEPTION_(env, JNI_FALSE);
   methodHandle mh(THREAD, Method::checked_resolve_jmethod_id(jmid));
   nmethod* nm = CompileBroker::compile_method(mh, bci, comp_level, mh, mh->invocation_count(), "WhiteBox", THREAD);
   MutexLockerEx mu(Compile_lock);
@@ -430,6 +440,7 @@ WB_END
 
 WB_ENTRY(void, WB_ClearMethodState(JNIEnv* env, jobject o, jobject method))
   jmethodID jmid = reflected_method_to_jmid(thread, env, method);
+  CHECK_JNI_EXCEPTION(env);
   methodHandle mh(THREAD, Method::checked_resolve_jmethod_id(jmid));
   MutexLockerEx mu(Compile_lock);
   MethodData* mdo = mh->method_data();
@@ -616,14 +627,18 @@ JVM_ENTRY(void, JVM_RegisterWhiteBoxMethods(JNIEnv* env, jclass wbclass))
         bool result = true;
         //  one by one registration natives for exception catching
         jclass exceptionKlass = env->FindClass(vmSymbols::java_lang_NoSuchMethodError()->as_C_string());
+        CHECK_JNI_EXCEPTION(env);
         for (int i = 0, n = sizeof(methods) / sizeof(methods[0]); i < n; ++i) {
           if (env->RegisterNatives(wbclass, methods + i, 1) != 0) {
             result = false;
-            if (env->ExceptionCheck() && env->IsInstanceOf(env->ExceptionOccurred(), exceptionKlass)) {
+            jthrowable throwable_obj = env->ExceptionOccurred();
+            if (throwable_obj != NULL) {
+              env->ExceptionClear();
+              if (env->IsInstanceOf(throwable_obj, exceptionKlass)) {
                 // j.l.NoSuchMethodError is thrown when a method can't be found or a method is not native
                 // ignoring the exception
                 tty->print_cr("Warning: 'NoSuchMethodError' on register of sun.hotspot.WhiteBox::%s%s", methods[i].name, methods[i].signature);
-              env->ExceptionClear();
+              }
             } else {
               // register is failed w/o exception or w/ unexpected exception
               tty->print_cr("Warning: unexpected error on register of sun.hotspot.WhiteBox::%s%s. All methods will be unregistered", methods[i].name, methods[i].signature);

src/share/vm/prims/whitebox.hpp

@@ -36,6 +36,22 @@
 #define WB_END JNI_END
 #define WB_METHOD_DECLARE(result_type) extern "C" result_type JNICALL
 
+#define CHECK_JNI_EXCEPTION_(env, value) \
+  do {                                   \
+    if (env->ExceptionCheck()) {         \
+      env->ExceptionClear();             \
+      return(value);                     \
+    }                                    \
+  } while (0)
+
+#define CHECK_JNI_EXCEPTION(env) \
+  do {                           \
+    if (env->ExceptionCheck()) { \
+      env->ExceptionClear();     \
+      return;                    \
+    }                            \
+  } while (0)
+
 class WhiteBox : public AllStatic {
  private:
   static bool _used;