changeset 6766:187a848525c4

Merge
author dholmes
date Mon, 14 Jul 2014 21:48:47 +0000
parents b235e51557c9 0dad53374470
children 553f14d70527
files
diffstat 3 files changed, 25 insertions(+), 20 deletions(-) [+]
line wrap: on
line diff
--- a/src/share/vm/prims/jni.cpp	Mon Jul 14 11:41:20 2014 +0200
+++ b/src/share/vm/prims/jni.cpp	Mon Jul 14 21:48:47 2014 +0000
@@ -247,15 +247,6 @@
       "Bug in native code: jfieldID offset must address interior of object");
 }
 
-// Pick a reasonable higher bound for local capacity requested
-// for EnsureLocalCapacity and PushLocalFrame.  We don't want it too
-// high because a test (or very unusual application) may try to allocate
-// that many handles and run out of swap space.  An implementation is
-// permitted to allocate more handles than the ensured capacity, so this
-// value is set high enough to prevent compatibility problems.
-const int MAX_REASONABLE_LOCAL_CAPACITY = 4*K;
-
-
 // Wrapper to trace JNI functions
 
 #ifdef ASSERT
@@ -741,7 +732,8 @@
   HOTSPOT_JNI_PUSHLOCALFRAME_ENTRY(env, capacity);
 
   //%note jni_11
-  if (capacity < 0 || capacity > MAX_REASONABLE_LOCAL_CAPACITY) {
+  if (capacity < 0 ||
+      ((MaxJNILocalCapacity > 0) && (capacity > MaxJNILocalCapacity))) {
     HOTSPOT_JNI_PUSHLOCALFRAME_RETURN((uint32_t)JNI_ERR);
     return JNI_ERR;
   }
@@ -844,7 +836,8 @@
   HOTSPOT_JNI_ENSURELOCALCAPACITY_ENTRY(env, capacity);
 
   jint ret;
-  if (capacity >= 0 && capacity <= MAX_REASONABLE_LOCAL_CAPACITY) {
+  if (capacity >= 0 &&
+      ((MaxJNILocalCapacity <= 0) || (capacity <= MaxJNILocalCapacity))) {
     ret = JNI_OK;
   } else {
     ret = JNI_ERR;
--- a/src/share/vm/prims/jniCheck.cpp	Mon Jul 14 11:41:20 2014 +0200
+++ b/src/share/vm/prims/jniCheck.cpp	Mon Jul 14 21:48:47 2014 +0000
@@ -185,6 +185,9 @@
  * throw an ArrayIndexOutOfBoundsException or ArrayStoreException.
  *
  * In all other cases, a non-error return value guarantees that no exceptions have been thrown.
+ *
+ * Programmers often defend against ArrayIndexOutOfBoundsException, so warning
+ * for these functions would be pedantic.
  */
 static inline void
 check_pending_exception(JavaThread* thr) {
@@ -201,6 +204,16 @@
   }
 }
 
+/**
+ * Add to the planned number of handles. I.e. plus current live & warning threshold
+ */
+static inline void
+add_planned_handle_capacity(JNIHandleBlock* handles, size_t capacity) {
+  handles->set_planned_capacity(capacity +
+                                handles->get_number_of_live_handles() +
+                                CHECK_JNI_LOCAL_REF_CAP_WARN_THRESHOLD);
+}
+
 
 static inline void
 functionEnterCritical(JavaThread* thr)
@@ -243,7 +256,7 @@
       thr->print_stack();
     )
     // Complain just the once, reset to current + warn threshold
-    handles->set_planned_capacity(live_handles + CHECK_JNI_LOCAL_REF_CAP_WARN_THRESHOLD);
+    add_planned_handle_capacity(handles, 0);
   }
 }
 
@@ -720,7 +733,7 @@
       NativeReportJNIFatalError(thr, "negative capacity");
     jint result = UNCHECKED()->PushLocalFrame(env, capacity);
     if (result == JNI_OK) {
-      thr->active_handles()->set_planned_capacity(capacity + CHECK_JNI_LOCAL_REF_CAP_WARN_THRESHOLD);
+      add_planned_handle_capacity(thr->active_handles(), capacity);
     }
     functionExit(thr);
     return result;
@@ -824,7 +837,7 @@
     }
     jint result = UNCHECKED()->EnsureLocalCapacity(env, capacity);
     if (result == JNI_OK) {
-      thr->active_handles()->set_planned_capacity(capacity + CHECK_JNI_LOCAL_REF_CAP_WARN_THRESHOLD);
+      add_planned_handle_capacity(thr->active_handles(), capacity);
     }
     functionExit(thr);
     return result;
@@ -1628,7 +1641,6 @@
       check_is_obj_array(thr, array);
     )
     jobject result = UNCHECKED()->GetObjectArrayElement(env,array,index);
-    thr->set_pending_jni_exception_check("GetObjectArrayElement");
     functionExit(thr);
     return result;
 JNI_END
@@ -1643,7 +1655,6 @@
       check_is_obj_array(thr, array);
     )
     UNCHECKED()->SetObjectArrayElement(env,array,index,val);
-    thr->set_pending_jni_exception_check("SetObjectArrayElement");
     functionExit(thr);
 JNI_END
 
@@ -1733,7 +1744,6 @@
       check_primitive_array_type(thr, array, ElementTag); \
     ) \
     UNCHECKED()->Get##Result##ArrayRegion(env,array,start,len,buf); \
-    thr->set_pending_jni_exception_check("Get"#Result"ArrayRegion"); \
     functionExit(thr); \
 JNI_END
 
@@ -1758,7 +1768,6 @@
       check_primitive_array_type(thr, array, ElementTag); \
     ) \
     UNCHECKED()->Set##Result##ArrayRegion(env,array,start,len,buf); \
-    thr->set_pending_jni_exception_check("Set"#Result"ArrayRegion"); \
     functionExit(thr); \
 JNI_END
 
@@ -1835,7 +1844,6 @@
       checkString(thr, str);
     )
     UNCHECKED()->GetStringRegion(env, str, start, len, buf);
-    thr->set_pending_jni_exception_check("GetStringRegion");
     functionExit(thr);
 JNI_END
 
@@ -1850,7 +1858,6 @@
       checkString(thr, str);
     )
     UNCHECKED()->GetStringUTFRegion(env, str, start, len, buf);
-    thr->set_pending_jni_exception_check("GetStringUTFRegion");
     functionExit(thr);
 JNI_END
 
--- a/src/share/vm/runtime/globals.hpp	Mon Jul 14 11:41:20 2014 +0200
+++ b/src/share/vm/runtime/globals.hpp	Mon Jul 14 21:48:47 2014 +0000
@@ -1216,6 +1216,11 @@
   product(bool, UseFastJNIAccessors, true,                                  \
           "Use optimized versions of Get<Primitive>Field")                  \
                                                                             \
+  product(intx, MaxJNILocalCapacity, 65536,                                 \
+          "Maximum allowable local JNI handle capacity to "                 \
+          "EnsureLocalCapacity() and PushLocalFrame(), "                    \
+          "where <= 0 is unlimited, default: 65536")                        \
+                                                                            \
   product(bool, EagerXrunInit, false,                                       \
           "Eagerly initialize -Xrun libraries; allows startup profiling, "  \
           "but not all -Xrun libraries may support the state of the VM "    \