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hotspot/src/share/vm/code/scopeDesc.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.
+ *
+ */
+
+// SimpleScopeDesc is used when all you need to extract from
+// a given pc,nmethod pair is a methodOop and a bci. This is
+// quite a bit faster than allocating a full ScopeDesc, but
+// very limited in abilities.
+
+class SimpleScopeDesc : public StackObj {
+ private:
+  methodOop _method;
+  int _bci;
+
+ public:
+  SimpleScopeDesc(nmethod* code,address pc) {
+    PcDesc* pc_desc = code->pc_desc_at(pc);
+    assert(pc_desc != NULL, "Must be able to find matching PcDesc");
+    DebugInfoReadStream buffer(code, pc_desc->scope_decode_offset());
+    int ignore_sender = buffer.read_int();
+    _method           = methodOop(buffer.read_oop());
+    _bci              = buffer.read_bci();
+  }
+
+  methodOop method() { return _method; }
+  int bci() { return _bci; }
+};
+
+// ScopeDescs contain the information that makes source-level debugging of
+// nmethods possible; each scopeDesc describes a method activation
+
+class ScopeDesc : public ResourceObj {
+ public:
+  // Constructor
+  ScopeDesc(const nmethod* code, int decode_offset, int obj_decode_offset);
+
+  // Calls above, giving default value of "serialized_null" to the
+  // "obj_decode_offset" argument.  (We don't use a default argument to
+  // avoid a .hpp-.hpp dependency.)
+  ScopeDesc(const nmethod* code, int decode_offset);
+
+  // JVM state
+  methodHandle method() const { return _method; }
+  int          bci()    const { return _bci;    }
+
+  GrowableArray<ScopeValue*>*   locals();
+  GrowableArray<ScopeValue*>*   expressions();
+  GrowableArray<MonitorValue*>* monitors();
+  GrowableArray<ScopeValue*>*   objects();
+
+  // Stack walking, returns NULL if this is the outer most scope.
+  ScopeDesc* sender() const;
+
+  // Returns where the scope was decoded
+  int decode_offset() const { return _decode_offset; }
+
+  // Tells whether sender() returns NULL
+  bool is_top() const;
+  // Tells whether sd is equal to this
+  bool is_equal(ScopeDesc* sd) const;
+
+ private:
+  // Alternative constructor
+  ScopeDesc(const ScopeDesc* parent);
+
+  // JVM state
+  methodHandle  _method;
+  int           _bci;
+
+  // Decoding offsets
+  int _decode_offset;
+  int _sender_decode_offset;
+  int _locals_decode_offset;
+  int _expressions_decode_offset;
+  int _monitors_decode_offset;
+
+  // Object pool
+  GrowableArray<ScopeValue*>* _objects;
+
+  // Nmethod information
+  const nmethod* _code;
+
+  // Decoding operations
+  void decode_body();
+  GrowableArray<ScopeValue*>* decode_scope_values(int decode_offset);
+  GrowableArray<MonitorValue*>* decode_monitor_values(int decode_offset);
+  GrowableArray<ScopeValue*>* decode_object_values(int decode_offset);
+
+  DebugInfoReadStream* stream_at(int decode_offset) const;
+
+
+ public:
+  // Verification
+  void verify();
+
+#ifndef PRODUCT
+ public:
+  // Printing support
+  void print_on(outputStream* st) const;
+  void print_on(outputStream* st, PcDesc* pd) const;
+  void print_value_on(outputStream* st) const;
+#endif
+};