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

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+/*
+ * Copyright 1997-2006 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.
+ *
+ */
+
+// Classes used for serializing debugging information.
+// These abstractions are introducted to provide symmetric
+// read and write operations.
+
+// ScopeValue        describes the value of a variable/expression in a scope
+// - LocationValue   describes a value in a given location (in frame or register)
+// - ConstantValue   describes a constant
+
+class ScopeValue: public ResourceObj {
+ public:
+  // Testers
+  virtual bool is_location() const { return false; }
+  virtual bool is_object() const { return false; }
+  virtual bool is_constant_int() const { return false; }
+  virtual bool is_constant_double() const { return false; }
+  virtual bool is_constant_long() const { return false; }
+  virtual bool is_constant_oop() const { return false; }
+  virtual bool equals(ScopeValue* other) const { return false; }
+
+  // Serialization of debugging information
+  virtual void write_on(DebugInfoWriteStream* stream) = 0;
+  static ScopeValue* read_from(DebugInfoReadStream* stream);
+};
+
+
+// A Location value describes a value in a given location; i.e. the corresponding
+// logical entity (e.g., a method temporary) lives in this location.
+
+class LocationValue: public ScopeValue {
+ private:
+  Location  _location;
+ public:
+  LocationValue(Location location)           { _location = location; }
+  bool      is_location() const              { return true; }
+  Location  location() const                 { return _location; }
+
+  // Serialization of debugging information
+  LocationValue(DebugInfoReadStream* stream);
+  void write_on(DebugInfoWriteStream* stream);
+
+  // Printing
+  void print_on(outputStream* st) const;
+};
+
+
+// An ObjectValue describes an object eliminated by escape analysis.
+
+class ObjectValue: public ScopeValue {
+ private:
+  int                        _id;
+  ScopeValue*                _klass;
+  GrowableArray<ScopeValue*> _field_values;
+  Handle                     _value;
+  bool                       _visited;
+
+ public:
+  ObjectValue(int id, ScopeValue* klass)
+     : _id(id)
+     , _klass(klass)
+     , _field_values()
+     , _value()
+     , _visited(false) {
+    assert(klass->is_constant_oop(), "should be constant klass oop");
+  }
+
+  ObjectValue(int id)
+     : _id(id)
+     , _klass(NULL)
+     , _field_values()
+     , _value()
+     , _visited(false) {}
+
+  // Accessors
+  bool                        is_object() const         { return true; }
+  int                         id() const                { return _id; }
+  ScopeValue*                 klass() const             { return _klass; }
+  GrowableArray<ScopeValue*>* field_values()            { return &_field_values; }
+  ScopeValue*                 field_at(int i) const     { return _field_values.at(i); }
+  int                         field_size()              { return _field_values.length(); }
+  Handle                      value() const             { return _value; }
+  bool                        is_visited() const        { return _visited; }
+
+  void                        set_value(oop value)      { _value = Handle(value); }
+  void                        set_visited(bool visited) { _visited = false; }
+
+  // Serialization of debugging information
+  void read_object(DebugInfoReadStream* stream);
+  void write_on(DebugInfoWriteStream* stream);
+
+  // Printing
+  void print_on(outputStream* st) const;
+  void print_fields_on(outputStream* st) const;
+};
+
+
+// A ConstantIntValue describes a constant int; i.e., the corresponding logical entity
+// is either a source constant or its computation has been constant-folded.
+
+class ConstantIntValue: public ScopeValue {
+ private:
+  jint _value;
+ public:
+  ConstantIntValue(jint value)         { _value = value; }
+  jint value() const                   { return _value;  }
+  bool is_constant_int() const         { return true;    }
+  bool equals(ScopeValue* other) const { return false;   }
+
+  // Serialization of debugging information
+  ConstantIntValue(DebugInfoReadStream* stream);
+  void write_on(DebugInfoWriteStream* stream);
+
+  // Printing
+  void print_on(outputStream* st) const;
+};
+
+class ConstantLongValue: public ScopeValue {
+ private:
+  jlong _value;
+ public:
+  ConstantLongValue(jlong value)       { _value = value; }
+  jlong value() const                  { return _value;  }
+  bool is_constant_long() const        { return true;    }
+  bool equals(ScopeValue* other) const { return false;   }
+
+  // Serialization of debugging information
+  ConstantLongValue(DebugInfoReadStream* stream);
+  void write_on(DebugInfoWriteStream* stream);
+
+  // Printing
+  void print_on(outputStream* st) const;
+};
+
+class ConstantDoubleValue: public ScopeValue {
+ private:
+  jdouble _value;
+ public:
+  ConstantDoubleValue(jdouble value)   { _value = value; }
+  jdouble value() const                { return _value;  }
+  bool is_constant_double() const      { return true;    }
+  bool equals(ScopeValue* other) const { return false;   }
+
+  // Serialization of debugging information
+  ConstantDoubleValue(DebugInfoReadStream* stream);
+  void write_on(DebugInfoWriteStream* stream);
+
+  // Printing
+  void print_on(outputStream* st) const;
+};
+
+// A ConstantOopWriteValue is created by the compiler to
+// be written as debugging information.
+
+class ConstantOopWriteValue: public ScopeValue {
+ private:
+  jobject _value;
+ public:
+  ConstantOopWriteValue(jobject value) { _value = value; }
+  jobject value() const                { return _value;  }
+  bool is_constant_oop() const         { return true;    }
+  bool equals(ScopeValue* other) const { return false;   }
+
+  // Serialization of debugging information
+  void write_on(DebugInfoWriteStream* stream);
+
+  // Printing
+  void print_on(outputStream* st) const;
+};
+
+// A ConstantOopReadValue is created by the VM when reading
+// debug information
+
+class ConstantOopReadValue: public ScopeValue {
+ private:
+  Handle _value;
+ public:
+  Handle value() const                 { return _value;  }
+  bool is_constant_oop() const         { return true;    }
+  bool equals(ScopeValue* other) const { return false;   }
+
+  // Serialization of debugging information
+  ConstantOopReadValue(DebugInfoReadStream* stream);
+  void write_on(DebugInfoWriteStream* stream);
+
+  // Printing
+  void print_on(outputStream* st) const;
+};
+
+// MonitorValue describes the pair used for monitor_enter and monitor_exit.
+
+class MonitorValue: public ResourceObj {
+ private:
+  ScopeValue* _owner;
+  Location    _basic_lock;
+  bool        _eliminated;
+ public:
+  // Constructor
+  MonitorValue(ScopeValue* owner, Location basic_lock, bool eliminated = false);
+
+  // Accessors
+  ScopeValue*  owner()      const { return _owner; }
+  Location     basic_lock() const { return _basic_lock;  }
+  bool         eliminated() const { return _eliminated; }
+
+  // Serialization of debugging information
+  MonitorValue(DebugInfoReadStream* stream);
+  void write_on(DebugInfoWriteStream* stream);
+
+  // Printing
+  void print_on(outputStream* st) const;
+};
+
+// DebugInfoReadStream specializes CompressedReadStream for reading
+// debugging information. Used by ScopeDesc.
+
+class DebugInfoReadStream : public CompressedReadStream {
+ private:
+  const nmethod* _code;
+  const nmethod* code() const { return _code; }
+  GrowableArray<ScopeValue*>* _obj_pool;
+ public:
+  DebugInfoReadStream(const nmethod* code, int offset, GrowableArray<ScopeValue*>* obj_pool = NULL) :
+    CompressedReadStream(code->scopes_data_begin(), offset) {
+    _code = code;
+    _obj_pool = obj_pool;
+
+  } ;
+
+  oop read_oop() {
+    return code()->oop_at(read_int());
+  }
+  ScopeValue* read_object_value();
+  ScopeValue* get_cached_object();
+  // BCI encoding is mostly unsigned, but -1 is a distinguished value
+  int read_bci() { return read_int() + InvocationEntryBci; }
+};
+
+// DebugInfoWriteStream specializes CompressedWriteStream for
+// writing debugging information. Used by ScopeDescRecorder.
+
+class DebugInfoWriteStream : public CompressedWriteStream {
+ private:
+  DebugInformationRecorder* _recorder;
+  DebugInformationRecorder* recorder() const { return _recorder; }
+ public:
+  DebugInfoWriteStream(DebugInformationRecorder* recorder, int initial_size);
+  void write_handle(jobject h);
+  void write_bci(int bci) { write_int(bci - InvocationEntryBci); }
+};