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hotspot/src/share/vm/code/scopeDesc.cpp

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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.
+ *
+ */
+
+# include "incls/_precompiled.incl"
+# include "incls/_scopeDesc.cpp.incl"
+
+
+ScopeDesc::ScopeDesc(const nmethod* code, int decode_offset, int obj_decode_offset) {
+  _code          = code;
+  _decode_offset = decode_offset;
+  _objects       = decode_object_values(obj_decode_offset);
+  decode_body();
+}
+
+ScopeDesc::ScopeDesc(const nmethod* code, int decode_offset) {
+  _code          = code;
+  _decode_offset = decode_offset;
+  _objects       = decode_object_values(DebugInformationRecorder::serialized_null);
+  decode_body();
+}
+
+
+ScopeDesc::ScopeDesc(const ScopeDesc* parent) {
+  _code          = parent->_code;
+  _decode_offset = parent->_sender_decode_offset;
+  _objects       = parent->_objects;
+  decode_body();
+}
+
+
+void ScopeDesc::decode_body() {
+  if (decode_offset() == DebugInformationRecorder::serialized_null) {
+    // This is a sentinel record, which is only relevant to
+    // approximate queries.  Decode a reasonable frame.
+    _sender_decode_offset = DebugInformationRecorder::serialized_null;
+    _method = methodHandle(_code->method());
+    _bci = InvocationEntryBci;
+    _locals_decode_offset = DebugInformationRecorder::serialized_null;
+    _expressions_decode_offset = DebugInformationRecorder::serialized_null;
+    _monitors_decode_offset = DebugInformationRecorder::serialized_null;
+  } else {
+    // decode header
+    DebugInfoReadStream* stream  = stream_at(decode_offset());
+
+    _sender_decode_offset = stream->read_int();
+    _method = methodHandle((methodOop) stream->read_oop());
+    _bci    = stream->read_bci();
+    // decode offsets for body and sender
+    _locals_decode_offset      = stream->read_int();
+    _expressions_decode_offset = stream->read_int();
+    _monitors_decode_offset    = stream->read_int();
+  }
+}
+
+
+GrowableArray<ScopeValue*>* ScopeDesc::decode_scope_values(int decode_offset) {
+  if (decode_offset == DebugInformationRecorder::serialized_null) return NULL;
+  DebugInfoReadStream* stream = stream_at(decode_offset);
+  int length = stream->read_int();
+  GrowableArray<ScopeValue*>* result = new GrowableArray<ScopeValue*> (length);
+  for (int index = 0; index < length; index++) {
+    result->push(ScopeValue::read_from(stream));
+  }
+  return result;
+}
+
+GrowableArray<ScopeValue*>* ScopeDesc::decode_object_values(int decode_offset) {
+  if (decode_offset == DebugInformationRecorder::serialized_null) return NULL;
+  GrowableArray<ScopeValue*>* result = new GrowableArray<ScopeValue*>();
+  DebugInfoReadStream* stream = new DebugInfoReadStream(_code, decode_offset, result);
+  int length = stream->read_int();
+  for (int index = 0; index < length; index++) {
+    result->push(ScopeValue::read_from(stream));
+  }
+  assert(result->length() == length, "inconsistent debug information");
+  return result;
+}
+
+
+GrowableArray<MonitorValue*>* ScopeDesc::decode_monitor_values(int decode_offset) {
+  if (decode_offset == DebugInformationRecorder::serialized_null) return NULL;
+  DebugInfoReadStream* stream  = stream_at(decode_offset);
+  int length = stream->read_int();
+  GrowableArray<MonitorValue*>* result = new GrowableArray<MonitorValue*> (length);
+  for (int index = 0; index < length; index++) {
+    result->push(new MonitorValue(stream));
+  }
+  return result;
+}
+
+DebugInfoReadStream* ScopeDesc::stream_at(int decode_offset) const {
+  return new DebugInfoReadStream(_code, decode_offset, _objects);
+}
+
+GrowableArray<ScopeValue*>* ScopeDesc::locals() {
+  return decode_scope_values(_locals_decode_offset);
+}
+
+GrowableArray<ScopeValue*>* ScopeDesc::expressions() {
+  return decode_scope_values(_expressions_decode_offset);
+}
+
+GrowableArray<MonitorValue*>* ScopeDesc::monitors() {
+  return decode_monitor_values(_monitors_decode_offset);
+}
+
+GrowableArray<ScopeValue*>* ScopeDesc::objects() {
+  return _objects;
+}
+
+bool ScopeDesc::is_top() const {
+ return _sender_decode_offset == DebugInformationRecorder::serialized_null;
+}
+
+ScopeDesc* ScopeDesc::sender() const {
+  if (is_top()) return NULL;
+  return new ScopeDesc(this);
+}
+
+
+#ifndef PRODUCT
+
+void ScopeDesc::print_value_on(outputStream* st) const {
+  tty->print("   ");
+  method()()->print_short_name(st);
+  int lineno = method()->line_number_from_bci(bci());
+  if (lineno != -1) {
+    st->print_cr("@%d (line %d)", bci(), lineno);
+  } else {
+    st->print_cr("@%d", bci());
+  }
+}
+
+void ScopeDesc::print_on(outputStream* st) const {
+  print_on(st, NULL);
+}
+
+void ScopeDesc::print_on(outputStream* st, PcDesc* pd) const {
+  // header
+  if (pd != NULL) {
+    tty->print_cr("ScopeDesc(pc=" PTR_FORMAT " offset=%x):", pd->real_pc(_code), pd->pc_offset());
+  }
+
+  print_value_on(st);
+  // decode offsets
+  if (WizardMode) {
+    st->print("ScopeDesc[%d]@" PTR_FORMAT " ", _decode_offset, _code->instructions_begin());
+    st->print_cr(" offset:     %d",    _decode_offset);
+    st->print_cr(" bci:        %d",    bci());
+    st->print_cr(" locals:     %d",    _locals_decode_offset);
+    st->print_cr(" stack:      %d",    _expressions_decode_offset);
+    st->print_cr(" monitor:    %d",    _monitors_decode_offset);
+    st->print_cr(" sender:     %d",    _sender_decode_offset);
+  }
+  // locals
+  { GrowableArray<ScopeValue*>* l = ((ScopeDesc*) this)->locals();
+    if (l != NULL) {
+      tty->print_cr("   Locals");
+      for (int index = 0; index < l->length(); index++) {
+        st->print("    - l%d: ", index);
+        l->at(index)->print_on(st);
+        st->cr();
+      }
+    }
+  }
+  // expressions
+  { GrowableArray<ScopeValue*>* l = ((ScopeDesc*) this)->expressions();
+    if (l != NULL) {
+      st->print_cr("   Expression stack");
+      for (int index = 0; index < l->length(); index++) {
+        st->print("   - @%d: ", index);
+        l->at(index)->print_on(st);
+        st->cr();
+      }
+    }
+  }
+  // monitors
+  { GrowableArray<MonitorValue*>* l = ((ScopeDesc*) this)->monitors();
+    if (l != NULL) {
+      st->print_cr("   Monitor stack");
+      for (int index = 0; index < l->length(); index++) {
+        st->print("    - @%d: ", index);
+        l->at(index)->print_on(st);
+        st->cr();
+      }
+    }
+  }
+
+#ifdef COMPILER2
+  if (DoEscapeAnalysis && is_top() && _objects != NULL) {
+    tty->print_cr("Objects");
+    for (int i = 0; i < _objects->length(); i++) {
+      ObjectValue* sv = (ObjectValue*) _objects->at(i);
+      tty->print(" - %d: ", sv->id());
+      sv->print_fields_on(tty);
+      tty->cr();
+    }
+  }
+#endif // COMPILER2
+}
+
+#endif
+
+void ScopeDesc::verify() {
+  ResourceMark rm;
+  guarantee(method()->is_method(), "type check");
+
+  // check if we have any illegal elements on the expression stack
+  { GrowableArray<ScopeValue*>* l = expressions();
+    if (l != NULL) {
+      for (int index = 0; index < l->length(); index++) {
+       //guarantee(!l->at(index)->is_illegal(), "expression element cannot be illegal");
+      }
+    }
+  }
+}