src/share/vm/utilities/nativeCallStack.cpp

rev 7899 : imported patch nmtfix

@@ -53,10 +53,11 @@
     _stack[index] = pc[index];
   }
   for (; index < NMT_TrackingStackDepth; index ++) {
     _stack[index] = NULL;
   }
+  _hash_value = 0;
 }
 
 // number of stack frames captured
 int NativeCallStack::frames() const {
   int index;

@@ -67,23 +68,20 @@
   }
   return index;
 }
 
 // Hash code. Any better algorithm?
-int NativeCallStack::hash() const {
-  long hash_val = _hash_value;
+unsigned int NativeCallStack::hash() const {
+  uintptr_t hash_val = _hash_value;
   if (hash_val == 0) {
-    long pc;
-    int  index;
-    for (index = 0; index < NMT_TrackingStackDepth; index ++) {
-      pc = (long)_stack[index];
-      if (pc == 0) break;
-      hash_val += pc;
+    for (int index = 0; index < NMT_TrackingStackDepth; index++) {
+      if (_stack[index] == NULL) break;
+      hash_val += (uintptr_t)_stack[index];
     }
 
     NativeCallStack* p = const_cast<NativeCallStack*>(this);
-    p->_hash_value = (int)(hash_val & 0xFFFFFFFF);
+    p->_hash_value = (unsigned int)(hash_val & 0xFFFFFFFF);
   }
   return _hash_value;
 }
 
 void NativeCallStack::print_on(outputStream* out) const {