7143807: ResourceMark nesting problem in stringStream

Reviewed-by: kvn, dcubed

hotspot/src/share/vm/memory/resourceArea.hpp

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1997, 2012, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -83,6 +83,10 @@ protected:
   Chunk *_chunk;                // saved arena chunk
   char *_hwm, *_max;
   size_t _size_in_bytes;
+#ifdef ASSERT
+  Thread* _thread;
+  ResourceMark* _previous_resource_mark;
+#endif //ASSERT
 
   void initialize(Thread *thread) {
     _area = thread->resource_area();
@@ -92,6 +96,11 @@ protected:
     _size_in_bytes = _area->size_in_bytes();
     debug_only(_area->_nesting++;)
     assert( _area->_nesting > 0, "must stack allocate RMs" );
+#ifdef ASSERT
+    _thread = thread;
+    _previous_resource_mark = thread->current_resource_mark();
+    thread->set_current_resource_mark(this);
+#endif // ASSERT
   }
  public:
 
@@ -111,6 +120,17 @@ protected:
     _size_in_bytes = r->_size_in_bytes;
     debug_only(_area->_nesting++;)
     assert( _area->_nesting > 0, "must stack allocate RMs" );
+#ifdef ASSERT
+    Thread* thread = ThreadLocalStorage::thread();
+    if (thread != NULL) {
+      _thread = thread;
+      _previous_resource_mark = thread->current_resource_mark();
+      thread->set_current_resource_mark(this);
+    } else {
+      _thread = NULL;
+      _previous_resource_mark = NULL;
+    }
+#endif // ASSERT
   }
 
   void reset_to_mark() {
@@ -137,6 +157,11 @@ protected:
     assert( _area->_nesting > 0, "must stack allocate RMs" );
     debug_only(_area->_nesting--;)
     reset_to_mark();
+#ifdef ASSERT
+    if (_thread != NULL) {
+      _thread->set_current_resource_mark(_previous_resource_mark);
+    }
+#endif // ASSERT
   }
 
 

hotspot/src/share/vm/runtime/thread.cpp

@@ -218,6 +218,7 @@ Thread::Thread() {
   // allocated data structures
   set_osthread(NULL);
   set_resource_area(new (mtThread)ResourceArea());
+  DEBUG_ONLY(_current_resource_mark = NULL;)
   set_handle_area(new (mtThread) HandleArea(NULL));
   set_metadata_handles(new (ResourceObj::C_HEAP, mtClass) GrowableArray<Metadata*>(30, true));
   set_active_handles(NULL);

hotspot/src/share/vm/runtime/thread.hpp

@@ -86,6 +86,8 @@ class GCTaskQueue;
 class ThreadClosure;
 class IdealGraphPrinter;
 
+DEBUG_ONLY(class ResourceMark;)
+
 class WorkerThread;
 
 // Class hierarchy
@@ -531,6 +533,8 @@ public:
   // Thread local resource area for temporary allocation within the VM
   ResourceArea* _resource_area;
 
+  DEBUG_ONLY(ResourceMark* _current_resource_mark;)
+
   // Thread local handle area for allocation of handles within the VM
   HandleArea* _handle_area;
   GrowableArray<Metadata*>* _metadata_handles;
@@ -585,6 +589,8 @@ public:
 
   // Deadlock detection
   bool allow_allocation()                        { return _allow_allocation_count == 0; }
+  ResourceMark* current_resource_mark()          { return _current_resource_mark; }
+  void set_current_resource_mark(ResourceMark* rm) { _current_resource_mark = rm; }
 #endif
 
   void check_for_valid_safepoint_state(bool potential_vm_operation) PRODUCT_RETURN;

hotspot/src/share/vm/utilities/ostream.cpp

@@ -296,6 +296,7 @@ stringStream::stringStream(size_t initial_size) : outputStream() {
   buffer        = NEW_RESOURCE_ARRAY(char, buffer_length);
   buffer_pos    = 0;
   buffer_fixed  = false;
+  DEBUG_ONLY(rm = Thread::current()->current_resource_mark();)
 }
 
 // useful for output to fixed chunks of memory, such as performance counters
@@ -321,6 +322,8 @@ void stringStream::write(const char* s, size_t len) {
         end = buffer_length * 2;
       }
       char* oldbuf = buffer;
+      assert(rm == NULL || Thread::current()->current_resource_mark() == rm,
+             "stringStream is re-allocated with a different ResourceMark");
       buffer = NEW_RESOURCE_ARRAY(char, end);
       strncpy(buffer, oldbuf, buffer_pos);
       buffer_length = end;

hotspot/src/share/vm/utilities/ostream.hpp

@@ -28,6 +28,8 @@
 #include "memory/allocation.hpp"
 #include "runtime/timer.hpp"
 
+DEBUG_ONLY(class ResourceMark;)
+
 // Output streams for printing
 //
 // Printing guidelines:
@@ -177,6 +179,7 @@ class stringStream : public outputStream {
   size_t buffer_pos;
   size_t buffer_length;
   bool   buffer_fixed;
+  DEBUG_ONLY(ResourceMark* rm;)
  public:
   stringStream(size_t initial_bufsize = 256);
   stringStream(char* fixed_buffer, size_t fixed_buffer_size);