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      1 /* Copyright (C) 2016 The Android Open Source Project
      2  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
      3  *
      4  * This file implements interfaces from the file jvmti.h. This implementation
      5  * is licensed under the same terms as the file jvmti.h.  The
      6  * copyright and license information for the file jvmti.h follows.
      7  *
      8  * Copyright (c) 2003, 2011, Oracle and/or its affiliates. All rights reserved.
      9  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
     10  *
     11  * This code is free software; you can redistribute it and/or modify it
     12  * under the terms of the GNU General Public License version 2 only, as
     13  * published by the Free Software Foundation.  Oracle designates this
     14  * particular file as subject to the "Classpath" exception as provided
     15  * by Oracle in the LICENSE file that accompanied this code.
     16  *
     17  * This code is distributed in the hope that it will be useful, but WITHOUT
     18  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
     19  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
     20  * version 2 for more details (a copy is included in the LICENSE file that
     21  * accompanied this code).
     22  *
     23  * You should have received a copy of the GNU General Public License version
     24  * 2 along with this work; if not, write to the Free Software Foundation,
     25  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
     26  *
     27  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
     28  * or visit www.oracle.com if you need additional information or have any
     29  * questions.
     30  */
     31 
     32 #ifndef ART_OPENJDKJVMTI_TI_STACK_H_
     33 #define ART_OPENJDKJVMTI_TI_STACK_H_
     34 
     35 #include "jni.h"
     36 #include "jvmti.h"
     37 
     38 #include "art_method.h"
     39 #include "base/mutex.h"
     40 #include "stack.h"
     41 
     42 namespace openjdkjvmti {
     43 
     44 class StackUtil {
     45  public:
     46   static jvmtiError GetAllStackTraces(jvmtiEnv* env,
     47                                       jint max_frame_count,
     48                                       jvmtiStackInfo** stack_info_ptr,
     49                                       jint* thread_count_ptr)
     50       REQUIRES(!art::Locks::thread_list_lock_);
     51 
     52   static jvmtiError GetFrameCount(jvmtiEnv* env, jthread thread, jint* count_ptr);
     53 
     54   static jvmtiError GetFrameLocation(jvmtiEnv* env,
     55                                      jthread thread,
     56                                      jint depth,
     57                                      jmethodID* method_ptr,
     58                                      jlocation* location_ptr);
     59 
     60   static jvmtiError GetStackTrace(jvmtiEnv* env,
     61                                   jthread thread,
     62                                   jint start_depth,
     63                                   jint max_frame_count,
     64                                   jvmtiFrameInfo* frame_buffer,
     65                                   jint* count_ptr);
     66 
     67   static jvmtiError GetThreadListStackTraces(jvmtiEnv* env,
     68                                              jint thread_count,
     69                                              const jthread* thread_list,
     70                                              jint max_frame_count,
     71                                              jvmtiStackInfo** stack_info_ptr);
     72 
     73   static jvmtiError GetOwnedMonitorStackDepthInfo(jvmtiEnv* env,
     74                                                   jthread thread,
     75                                                   jint* info_cnt_ptr,
     76                                                   jvmtiMonitorStackDepthInfo** info_ptr);
     77 
     78   static jvmtiError GetOwnedMonitorInfo(jvmtiEnv* env,
     79                                         jthread thread,
     80                                         jint* owned_monitor_count_ptr,
     81                                         jobject** owned_monitors_ptr);
     82 
     83   static jvmtiError NotifyFramePop(jvmtiEnv* env, jthread thread, jint depth);
     84 };
     85 
     86 struct FindFrameAtDepthVisitor : art::StackVisitor {
     87  public:
     88   FindFrameAtDepthVisitor(art::Thread* target, art::Context* ctx, jint depth)
     89       REQUIRES_SHARED(art::Locks::mutator_lock_)
     90       : art::StackVisitor(target, ctx, art::StackVisitor::StackWalkKind::kIncludeInlinedFrames),
     91         found_frame_(false),
     92         cnt_(0),
     93         depth_(static_cast<size_t>(depth)) { }
     94 
     95   bool FoundFrame() {
     96     return found_frame_;
     97   }
     98 
     99   bool VisitFrame() NO_THREAD_SAFETY_ANALYSIS {
    100     if (GetMethod()->IsRuntimeMethod()) {
    101       return true;
    102     }
    103     if (cnt_ == depth_) {
    104       // We found our frame, exit.
    105       found_frame_ = true;
    106       return false;
    107     } else {
    108       cnt_++;
    109       return true;
    110     }
    111   }
    112 
    113  private:
    114   bool found_frame_;
    115   size_t cnt_;
    116   size_t depth_;
    117 };
    118 
    119 }  // namespace openjdkjvmti
    120 
    121 #endif  // ART_OPENJDKJVMTI_TI_STACK_H_
    122