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      1 #!/usr/sbin/dtrace -Zs
      2 /*
      3  * Copyright (c) 2006, Oracle and/or its affiliates. All rights reserved.
      4  *
      5  * Redistribution and use in source and binary forms, with or without
      6  * modification, are permitted provided that the following conditions
      7  * are met:
      8  *
      9  *   - Redistributions of source code must retain the above copyright
     10  *     notice, this list of conditions and the following disclaimer.
     11  *
     12  *   - Redistributions in binary form must reproduce the above copyright
     13  *     notice, this list of conditions and the following disclaimer in the
     14  *     documentation and/or other materials provided with the distribution.
     15  *
     16  *   - Neither the name of Oracle nor the names of its
     17  *     contributors may be used to endorse or promote products derived
     18  *     from this software without specific prior written permission.
     19  *
     20  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
     21  * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
     22  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     23  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR
     24  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
     25  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
     26  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
     27  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
     28  * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
     29  * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
     30  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     31  */
     32 
     33 /*
     34 */
     35 
     36 /*
     37  * Usage:
     38  *   1. method_invocation_tree.d -c "java ..."
     39  *   2. method_invocation_tree.d -p JAVA_PID
     40  *
     41  * This script prints tree of Java and JNI method invocations.
     42  *
     43  * Notes:
     44  *  - These probes are disabled by default since it incurs performance
     45  *    overhead to the application. To trace the method-entry and
     46  *    method-exit probes, you need to turn on the ExtendedDTraceProbes VM
     47  *    option.
     48  *    You can either start the application with -XX:+ExtendedDTraceProbes
     49  *    option or use the jinfo command to enable it at runtime as follows:
     50  *
     51  *       jinfo -flag +ExtendedDTraceProbes <java_pid>
     52  *
     53  */
     54 
     55 #pragma D option quiet
     56 #pragma D option destructive
     57 #pragma D option defaultargs
     58 #pragma D option bufsize=16m
     59 #pragma D option aggrate=100ms
     60 
     61 self char *str_ptr;
     62 self string class_name;
     63 self string method_name;
     64 self string signature;
     65 
     66 self int indent;
     67 
     68 BEGIN
     69 {
     70     SAMPLE_NAME = "hotspot method invocation tracing";
     71 
     72     printf("BEGIN %s\n\n", SAMPLE_NAME);
     73 }
     74 
     75 hotspot$target:::*
     76 /!self->indent/
     77 {
     78     self->indent = 0;
     79 }
     80 
     81 /*
     82  * hotspot:::method-entry, hotspot:::method-return probe arguments:
     83  *  arg0: uintptr_t,    Java thread id
     84  *  arg1: char*,        a pointer to mUTF-8 string containing the name of
     85  *                          the class of the method being entered
     86  *  arg2: uintptr_t,    the length of the class name (in bytes)
     87  *  arg3: char*,        a pointer to mUTF-8 string data which contains the
     88  *                          name of the method being entered
     89  *  arg4: uintptr_t,    the length of the method name (in bytes)
     90  *  arg5: char*,        a pointer to mUTF-8 string data which contains the
     91  *                          signature of the method being entered
     92  *  arg6: uintptr_t,    the length of the signature(in bytes)
     93  */
     94 
     95 hotspot$target:::method-return
     96 {
     97     self->indent --;
     98     METHOD_RETURN_CNT ++
     99 }
    100 
    101 hotspot$target:::method-entry
    102 {
    103     self->indent ++;
    104     METHOD_ENTRY_CNT ++;
    105 
    106     self->str_ptr = (char*) copyin(arg1, arg2+1);
    107     self->str_ptr[arg2] = '\0';
    108     self->class_name = (string) self->str_ptr;
    109 
    110     self->str_ptr = (char*) copyin(arg3, arg4+1);
    111     self->str_ptr[arg4] = '\0';
    112     self->method_name = (string) self->str_ptr;
    113 
    114     self->str_ptr = (char*) copyin(arg5, arg6+1);
    115     self->str_ptr[arg6] = '\0';
    116     self->signature = (string) self->str_ptr;
    117 
    118     printf("%-10u%*s%s:%s:%s\n",
    119         tid, self->indent, "", self->class_name,
    120         self->method_name, self->signature);
    121 
    122 }
    123 
    124 hotspot_jni$target:::*_entry
    125 {
    126     printf("%-10u%*sJNI:%s\n", tid, self->indent+1, "", probename);
    127 }
    128 
    129 :::END
    130 {
    131     printf("METHOD_ENTRY_CNT:  %10d\n", METHOD_ENTRY_CNT);
    132     printf("METHOD_RETURN_CNT: %10d\n", METHOD_RETURN_CNT);
    133 
    134     printf("\nEND of %s\n", SAMPLE_NAME);
    135 }
    136 
    137 syscall::rexit:entry,
    138 syscall::exit:entry
    139 /pid == $target/
    140 {
    141    exit(0);
    142 }
    143