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hotspot/src/share/vm/code/debugInfoRec.hpp

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+/*
+ * Copyright 1998-2005 Sun Microsystems, Inc.  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
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ *
+ */
+
+//** The DebugInformationRecorder collects debugging information
+//   for a compiled method.
+//   Debugging information is used for:
+//   - garbage collecting compiled frames
+//   - stack tracing across compiled frames
+//   - deoptimizating compiled frames
+//
+//   The implementation requires the compiler to use the recorder
+//   in the following order:
+//   1) Describe debug information for safepoints at increasing addresses.
+//      a) Add safepoint entry (use add_safepoint or add_non_safepoint)
+//      b) Describe scopes for that safepoint
+//         - create locals if needed (use create_scope_values)
+//         - create expressions if needed (use create_scope_values)
+//         - create monitor stack if needed (use create_monitor_values)
+//         - describe scope (use describe_scope)
+//         "repeat last four steps for all scopes"
+//         "outer most scope first and inner most scope last"
+//         NB: nodes from create_scope_values and create_locations
+//             can be reused for simple sharing.
+//         - mark the end of the scopes (end_safepoint or end_non_safepoint)
+//   2) Use oop_size, data_size, pcs_size to create the nmethod and
+//      finally migrate the debugging information into the nmethod
+//      by calling copy_to.
+
+class DebugToken; // Opaque datatype for stored:
+                  //  - GrowableArray<ScopeValue*>
+                  //  - GrowableArray<MonitorValue*>
+
+// Alias for InvocationEntryBci.
+// Both constants are used for a pseudo-BCI which refers
+// to the state just _before_ a method is entered.
+// SynchronizationEntryBCI is used where the emphasis
+// is on the implicit monitorenter of a synchronized method.
+const int SynchronizationEntryBCI = InvocationEntryBci;
+
+class DIR_Chunk; // private class, a nugget of collected information
+
+class DebugInformationRecorder: public ResourceObj {
+ public:
+  // constructor
+  DebugInformationRecorder(OopRecorder* oop_recorder);
+
+  // adds an oopmap at a specific offset
+  void add_oopmap(int pc_offset, OopMap* map);
+
+  // adds a jvm mapping at pc-offset, for a safepoint only
+  void add_safepoint(int pc_offset, OopMap* map);
+
+  // adds a jvm mapping at pc-offset, for a non-safepoint (profile point)
+  void add_non_safepoint(int pc_offset);
+
+  // Describes debugging information for a scope at the given pc_offset.
+  // Calls must be in non-decreasing order of pc_offset.
+  // If there are several calls at a single pc_offset,
+  // then they occur in the same order as they were performed by the JVM,
+  // with the most recent (innermost) call being described last.
+  // For a safepoint, the pc_offset must have been mentioned
+  // previously by add_safepoint.
+  // Otherwise, the pc_offset must have been mentioned previously
+  // by add_non_safepoint, and the locals, expressions, and monitors
+  // must all be null.
+  void describe_scope(int         pc_offset,
+                      ciMethod*   method,
+                      int         bci,
+                      DebugToken* locals      = NULL,
+                      DebugToken* expressions = NULL,
+                      DebugToken* monitors    = NULL);
+
+
+  void dump_object_pool(GrowableArray<ScopeValue*>* objects);
+
+  // This call must follow every add_safepoint,
+  // after any intervening describe_scope calls.
+  void end_safepoint(int pc_offset)      { end_scopes(pc_offset, true); }
+  void end_non_safepoint(int pc_offset)  { end_scopes(pc_offset, false); }
+
+  // helper fuctions for describe_scope to enable sharing
+  DebugToken* create_scope_values(GrowableArray<ScopeValue*>* values);
+  DebugToken* create_monitor_values(GrowableArray<MonitorValue*>* monitors);
+
+  // returns the size of the generated scopeDescs.
+  int data_size();
+  int pcs_size();
+  int oop_size() { return oop_recorder()->oop_size(); }
+
+  // copy the generated debugging information to nmethod
+  void copy_to(nmethod* nm);
+
+  // verifies the debug information
+  void verify(const nmethod* code);
+
+  static void print_statistics() PRODUCT_RETURN;
+
+  // Method for setting oopmaps to temporarily preserve old handling of oopmaps
+  OopMapSet *_oopmaps;
+  void set_oopmaps(OopMapSet *oopmaps) { _oopmaps = oopmaps; }
+
+  OopRecorder* oop_recorder() { return _oop_recorder; }
+
+  int last_pc_offset() { return last_pc()->pc_offset(); }
+
+  bool recording_non_safepoints() { return _recording_non_safepoints; }
+
+ private:
+  friend class ScopeDesc;
+  friend class vframeStreamCommon;
+  friend class DIR_Chunk;
+
+  // True if we are recording non-safepoint scopes.
+  // This flag is set if DebugNonSafepoints is true, or if
+  // JVMTI post_compiled_method_load events are enabled.
+  const bool _recording_non_safepoints;
+
+  DebugInfoWriteStream* _stream;
+
+  DebugInfoWriteStream* stream() const { return _stream; }
+
+  OopRecorder* _oop_recorder;
+
+  // Scopes that have been described so far.
+  GrowableArray<DIR_Chunk*>* _all_chunks;
+  GrowableArray<DIR_Chunk*>* _shared_chunks;
+  DIR_Chunk* _next_chunk;
+  DIR_Chunk* _next_chunk_limit;
+
+#ifdef ASSERT
+  enum { rs_null, rs_safepoint, rs_non_safepoint };
+  int _recording_state;
+#endif
+
+  PcDesc* _pcs;
+  int     _pcs_size;
+  int     _pcs_length;
+  // Note:  Would use GrowableArray<PcDesc>, but structs are not supported.
+
+  // PC of most recent real safepoint before the current one,
+  // updated after end_scopes.
+  int _prev_safepoint_pc;
+
+  PcDesc* last_pc() {
+    guarantee(_pcs_length > 0, "a safepoint must be declared already");
+    return &_pcs[_pcs_length-1];
+  }
+  PcDesc* prev_pc() {
+    guarantee(_pcs_length > 1, "a safepoint must be declared already");
+    return &_pcs[_pcs_length-2];
+  }
+  void add_new_pc_offset(int pc_offset);
+  void end_scopes(int pc_offset, bool is_safepoint);
+
+  int  serialize_monitor_values(GrowableArray<MonitorValue*>* monitors);
+  int  serialize_scope_values(GrowableArray<ScopeValue*>* values);
+  int  find_sharable_decode_offset(int stream_offset);
+
+ public:
+  enum { serialized_null = 0 };
+};