/*

 * Copyright (c) 1997, 2014, 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

 * 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 *

 */

#include "precompiled.hpp"

#include "classfile/javaClasses.hpp"

#include "classfile/systemDictionary.hpp"

#include "classfile/vmSymbols.hpp"

#include "code/codeCache.hpp"

#include "code/debugInfoRec.hpp"

#include "code/nmethod.hpp"

#include "code/pcDesc.hpp"

#include "code/scopeDesc.hpp"

#include "interpreter/interpreter.hpp"

#include "interpreter/oopMapCache.hpp"

#include "memory/resourceArea.hpp"

#include "oops/instanceKlass.hpp"

#include "oops/oop.inline.hpp"

#include "runtime/handles.inline.hpp"

#include "runtime/objectMonitor.hpp"

#include "runtime/objectMonitor.inline.hpp"

#include "runtime/signature.hpp"

#include "runtime/stubRoutines.hpp"

#include "runtime/synchronizer.hpp"

#include "runtime/vframe.hpp"

#include "runtime/vframeArray.hpp"

#include "runtime/vframe_hp.hpp"

PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC

vframe::vframe(const frame* fr, const RegisterMap* reg_map, JavaThread* thread)

: _reg_map(reg_map), _thread(thread) {

  assert(fr != NULL, "must have frame");

  _fr = *fr;

}

vframe::vframe(const frame* fr, JavaThread* thread)

: _reg_map(thread), _thread(thread) {

  assert(fr != NULL, "must have frame");

  _fr = *fr;

}

vframe* vframe::new_vframe(const frame* f, const RegisterMap* reg_map, JavaThread* thread) {

  // Interpreter frame

  if (f->is_interpreted_frame()) {

    return new interpretedVFrame(f, reg_map, thread);

  }

  // Compiled frame

  CodeBlob* cb = f->cb();

  if (cb != NULL) {

    if (cb->is_nmethod()) {

      nmethod* nm = (nmethod*)cb;

      return new compiledVFrame(f, reg_map, thread, nm);

    }

    if (f->is_runtime_frame()) {

      // Skip this frame and try again.

      RegisterMap temp_map = *reg_map;

      frame s = f->sender(&temp_map);

      return new_vframe(&s, &temp_map, thread);

    }

  }

  // External frame

  return new externalVFrame(f, reg_map, thread);

}

vframe* vframe::sender() const {

  RegisterMap temp_map = *register_map();

  assert(is_top(), "just checking");

  if (_fr.is_entry_frame() && _fr.is_first_frame()) return NULL;

  frame s = _fr.real_sender(&temp_map);

  if (s.is_first_frame()) return NULL;

  return vframe::new_vframe(&s, &temp_map, thread());

}

vframe* vframe::top() const {

  vframe* vf = (vframe*) this;

  while (!vf->is_top()) vf = vf->sender();

  return vf;

}

javaVFrame* vframe::java_sender() const {

  vframe* f = sender();

  while (f != NULL) {

    if (f->is_java_frame()) return javaVFrame::cast(f);

    f = f->sender();

  }

  return NULL;

}

// ------------- javaVFrame --------------

GrowableArray<MonitorInfo*>* javaVFrame::locked_monitors() {

  assert(SafepointSynchronize::is_at_safepoint() || JavaThread::current() == thread(),

         "must be at safepoint or it's a java frame of the current thread");

  GrowableArray<MonitorInfo*>* mons = monitors();

  GrowableArray<MonitorInfo*>* result = new GrowableArray<MonitorInfo*>(mons->length());

  if (mons->is_empty()) return result;

  bool found_first_monitor = false;

  ObjectMonitor *pending_monitor = thread()->current_pending_monitor();

  ObjectMonitor *waiting_monitor = thread()->current_waiting_monitor();

  oop pending_obj = (pending_monitor != NULL ? (oop) pending_monitor->object() : (oop) NULL);

  oop waiting_obj = (waiting_monitor != NULL ? (oop) waiting_monitor->object() : (oop) NULL);

  for (int index = (mons->length()-1); index >= 0; index--) {

    MonitorInfo* monitor = mons->at(index);

    if (monitor->eliminated() && is_compiled_frame()) continue; // skip eliminated monitor

    oop obj = monitor->owner();

    if (obj == NULL) continue; // skip unowned monitor

    //

    // Skip the monitor that the thread is blocked to enter or waiting on

    //

    if (!found_first_monitor && (obj == pending_obj || obj == waiting_obj)) {

      continue;

    }

    found_first_monitor = true;

    result->append(monitor);

  }

  return result;

}

static void print_locked_object_class_name(outputStream* st, Handle obj, const char* lock_state) {

  if (obj.not_null()) {

    st->print("\t- %s <" INTPTR_FORMAT "> ", lock_state, (address)obj());

    if (obj->klass() == SystemDictionary::Class_klass()) {

      Klass* target_klass = java_lang_Class::as_Klass(obj());

      st->print_cr("(a java.lang.Class for %s)", InstanceKlass::cast(target_klass)->external_name());

    } else {

      Klass* k = obj->klass();

      st->print_cr("(a %s)", k->external_name());

    }

  }

}

void javaVFrame::print_lock_info_on(outputStream* st, int frame_count) {

  ResourceMark rm;

  // If this is the first frame, and java.lang.Object.wait(...) then print out the receiver.

  if (frame_count == 0) {

    if (method()->name() == vmSymbols::wait_name() &&

        method()->method_holder()->name() == vmSymbols::java_lang_Object()) {

      StackValueCollection* locs = locals();

      if (!locs->is_empty()) {

        StackValue* sv = locs->at(0);

        if (sv->type() == T_OBJECT) {

          Handle o = locs->at(0)->get_obj();

          print_locked_object_class_name(st, o, "waiting on");

        }

      }

    } else if (thread()->current_park_blocker() != NULL) {

      oop obj = thread()->current_park_blocker();

      Klass* k = obj->klass();

      st->print_cr("\t- %s <" INTPTR_FORMAT "> (a %s)", "parking to wait for ", (address)obj, k->external_name());

    }

  }

  // Print out all monitors that we have locked or are trying to lock

  GrowableArray<MonitorInfo*>* mons = monitors();

  if (!mons->is_empty()) {

    bool found_first_monitor = false;

    for (int index = (mons->length()-1); index >= 0; index--) {

      MonitorInfo* monitor = mons->at(index);

      if (monitor->eliminated() && is_compiled_frame()) { // Eliminated in compiled code

        if (monitor->owner_is_scalar_replaced()) {

          Klass* k = java_lang_Class::as_Klass(monitor->owner_klass());

          st->print("\t- eliminated <owner is scalar replaced> (a %s)", k->external_name());

        } else {

          oop obj = monitor->owner();

          if (obj != NULL) {

            print_locked_object_class_name(st, obj, "eliminated");

          }

        }

        continue;

      }

      if (monitor->owner() != NULL) {

        // the monitor is associated with an object, i.e., it is locked

        // First, assume we have the monitor locked. If we haven't found an

        // owned monitor before and this is the first frame, then we need to

        // see if we have completed the lock or we are blocked trying to

        // acquire it - we can only be blocked if the monitor is inflated

        const char *lock_state = "locked"; // assume we have the monitor locked

        if (!found_first_monitor && frame_count == 0) {

          markOop mark = monitor->owner()->mark();

          if (mark->has_monitor() &&

              ( // we have marked ourself as pending on this monitor

                mark->monitor() == thread()->current_pending_monitor() ||

                // we are not the owner of this monitor

                !mark->monitor()->is_entered(thread())

              )) {

            lock_state = "waiting to lock";

          }

        }

        found_first_monitor = true;

        print_locked_object_class_name(st, monitor->owner(), lock_state);

      }

    }

  }

}

// ------------- interpretedVFrame --------------

u_char* interpretedVFrame::bcp() const {

  return fr().interpreter_frame_bcp();

}

void interpretedVFrame::set_bcp(u_char* bcp) {

  fr().interpreter_frame_set_bcp(bcp);

}

intptr_t* interpretedVFrame::locals_addr_at(int offset) const {

  assert(fr().is_interpreted_frame(), "frame should be an interpreted frame");

  return fr().interpreter_frame_local_at(offset);

}

GrowableArray<MonitorInfo*>* interpretedVFrame::monitors() const {

  GrowableArray<MonitorInfo*>* result = new GrowableArray<MonitorInfo*>(5);

  for (BasicObjectLock* current = (fr().previous_monitor_in_interpreter_frame(fr().interpreter_frame_monitor_begin()));

       current >= fr().interpreter_frame_monitor_end();

       current = fr().previous_monitor_in_interpreter_frame(current)) {

    result->push(new MonitorInfo(current->obj(), current->lock(), false, false));

  }

  return result;

}

int interpretedVFrame::bci() const {

  return method()->bci_from(bcp());

}

Method* interpretedVFrame::method() const {

  return fr().interpreter_frame_method();

}

StackValueCollection* interpretedVFrame::locals() const {

  int length = method()->max_locals();

  if (method()->is_native()) {

    // If the method is native, max_locals is not telling the truth.

    // maxlocals then equals the size of parameters

    length = method()->size_of_parameters();

  }

  StackValueCollection* result = new StackValueCollection(length);

  // Get oopmap describing oops and int for current bci

  InterpreterOopMap oop_mask;

  if (TraceDeoptimization && Verbose) {

    // need the current JavaThread and not thread()

    methodHandle m_h(Thread::current(), method());

    OopMapCache::compute_one_oop_map(m_h, bci(), &oop_mask);

  } else {

    method()->mask_for(bci(), &oop_mask);

  }

  // handle locals

  for(int i=0; i < length; i++) {

    // Find stack location

    intptr_t *addr = locals_addr_at(i);

    // Depending on oop/int put it in the right package

    StackValue *sv;

    if (oop_mask.is_oop(i)) {

      // oop value

      Handle h(*(oop *)addr);

      sv = new StackValue(h);

    } else {

      // integer

      sv = new StackValue(*addr);

    }

    assert(sv != NULL, "sanity check");

    result->add(sv);

  }

  return result;

}

void interpretedVFrame::set_locals(StackValueCollection* values) const {

  if (values == NULL || values->size() == 0) return;

  int length = method()->max_locals();

  if (method()->is_native()) {

    // If the method is native, max_locals is not telling the truth.

    // maxlocals then equals the size of parameters

    length = method()->size_of_parameters();

  }

  assert(length == values->size(), "Mismatch between actual stack format and supplied data");

  // handle locals

  for (int i = 0; i < length; i++) {

    // Find stack location

    intptr_t *addr = locals_addr_at(i);

    // Depending on oop/int put it in the right package

    StackValue *sv = values->at(i);

    assert(sv != NULL, "sanity check");

    if (sv->type() == T_OBJECT) {

      *(oop *) addr = (sv->get_obj())();

    } else {                   // integer

      *addr = sv->get_int();

    }

  }

}

StackValueCollection* interpretedVFrame::expressions() const {

  InterpreterOopMap oop_mask;

  if (!method()->is_native()) {

    // Get oopmap describing oops and int for current bci

    if (TraceDeoptimization && Verbose) {

      // need the current JavaThread and not thread()

      methodHandle m_h(Thread::current(), method());

      OopMapCache::compute_one_oop_map(m_h, bci(), &oop_mask);

    } else {

      method()->mask_for(bci(), &oop_mask);

    }

  }

  // If the bci is a call instruction, i.e. any of the invoke* instructions,

  // the InterpreterOopMap does not include expression/operand stack liveness

  // info in the oop_mask/bit_mask. This can lead to a discrepancy of what

  // is actually on the expression stack compared to what is given by the

  // oop_map. We need to use the length reported in the oop_map.

  int length = oop_mask.expression_stack_size();

  assert(fr().interpreter_frame_expression_stack_size() >= length,

    "error in expression stack!");

  StackValueCollection* result = new StackValueCollection(length);

  if (0 == length) {

    return result;

  }

  int nof_locals = method()->max_locals();

  // handle expressions

  for(int i=0; i < length; i++) {

    // Find stack location

    intptr_t *addr = fr().interpreter_frame_expression_stack_at(i);

    // Depending on oop/int put it in the right package

    StackValue *sv;

    if (oop_mask.is_oop(i + nof_locals)) {

      // oop value

      Handle h(*(oop *)addr);

      sv = new StackValue(h);

    } else {

      // integer

      sv = new StackValue(*addr);

    }

    assert(sv != NULL, "sanity check");

    result->add(sv);

  }

  return result;

}

// ------------- cChunk --------------

entryVFrame::entryVFrame(const frame* fr, const RegisterMap* reg_map, JavaThread* thread)

: externalVFrame(fr, reg_map, thread) {}

void vframeStreamCommon::found_bad_method_frame() {

  // 6379830 Cut point for an assertion that occasionally fires when

  // we are using the performance analyzer.

  // Disable this assert when testing the analyzer with fastdebug.

  // -XX:SuppressErrorAt=vframe.cpp:XXX (XXX=following line number)

  assert(false, "invalid bci or invalid scope desc");

}

// top-frame will be skipped

vframeStream::vframeStream(JavaThread* thread, frame top_frame,

  bool stop_at_java_call_stub) : vframeStreamCommon(thread) {

  _stop_at_java_call_stub = stop_at_java_call_stub;

  // skip top frame, as it may not be at safepoint

  _frame  = top_frame.sender(&_reg_map);

  while (!fill_from_frame()) {

    _frame = _frame.sender(&_reg_map);

  }

}

// Step back n frames, skip any pseudo frames in between.

// This function is used in Class.forName, Class.newInstance, Method.Invoke,

// AccessController.doPrivileged.

void vframeStreamCommon::security_get_caller_frame(int depth) {

  assert(depth >= 0, err_msg("invalid depth: %d", depth));

  for (int n = 0; !at_end(); security_next()) {

    if (!method()->is_ignored_by_security_stack_walk()) {

      if (n == depth) {

        // We have reached the desired depth; return.

        return;

      }

      n++;  // this is a non-skipped frame; count it against the depth

    }

  }

  // NOTE: At this point there were not enough frames on the stack

  // to walk to depth.  Callers of this method have to check for at_end.

}

void vframeStreamCommon::security_next() {

  if (method()->is_prefixed_native()) {

    skip_prefixed_method_and_wrappers();  // calls next()

  } else {

    next();

  }

}

void vframeStreamCommon::skip_prefixed_method_and_wrappers() {

  ResourceMark rm;

  HandleMark hm;

  int    method_prefix_count = 0;

  char** method_prefixes = JvmtiExport::get_all_native_method_prefixes(&method_prefix_count);

  KlassHandle prefixed_klass(method()->method_holder());

  const char* prefixed_name = method()->name()->as_C_string();

  size_t prefixed_name_len = strlen(prefixed_name);

  int prefix_index = method_prefix_count-1;

  while (!at_end()) {

    next();

    if (method()->method_holder() != prefixed_klass()) {

      break; // classes don't match, can't be a wrapper

    }

    const char* name = method()->name()->as_C_string();

    size_t name_len = strlen(name);

    size_t prefix_len = prefixed_name_len - name_len;

    if (prefix_len <= 0 || strcmp(name, prefixed_name + prefix_len) != 0) {

      break; // prefixed name isn't prefixed version of method name, can't be a wrapper

    }

    for (; prefix_index >= 0; --prefix_index) {

      const char* possible_prefix = method_prefixes[prefix_index];

      size_t possible_prefix_len = strlen(possible_prefix);

      if (possible_prefix_len == prefix_len &&

          strncmp(possible_prefix, prefixed_name, prefix_len) == 0) {

        break; // matching prefix found

      }

    }

    if (prefix_index < 0) {

      break; // didn't find the prefix, can't be a wrapper

    }

    prefixed_name = name;

    prefixed_name_len = name_len;

  }

}

void vframeStreamCommon::skip_reflection_related_frames() {

  while (!at_end() &&

          (method()->method_holder()->is_subclass_of(SystemDictionary::reflect_MethodAccessorImpl_klass()) ||

    next();

  }

}

#ifndef PRODUCT

void vframe::print() {

  if (WizardMode) _fr.print_value_on(tty,NULL);

}

void vframe::print_value() const {

  ((vframe*)this)->print();

}

void entryVFrame::print_value() const {

  ((entryVFrame*)this)->print();

}

void entryVFrame::print() {

  vframe::print();

  tty->print_cr("C Chunk inbetween Java");

  tty->print_cr("C     link " INTPTR_FORMAT, _fr.link());

}

// ------------- javaVFrame --------------

static void print_stack_values(const char* title, StackValueCollection* values) {