1 /*
   2  * Copyright (c) 1997, 2012, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 #ifndef SHARE_VM_RUNTIME_DTRACEJSDT_HPP
  26 #define SHARE_VM_RUNTIME_DTRACEJSDT_HPP
  27 
  28 #include "code/nmethod.hpp"
  29 #ifdef TARGET_ARCH_x86
  30 # include "nativeInst_x86.hpp"
  31 #endif
  32 #ifdef TARGET_ARCH_sparc
  33 # include "nativeInst_sparc.hpp"
  34 #endif
  35 #ifdef TARGET_ARCH_zero
  36 # include "nativeInst_zero.hpp"
  37 #endif
  38 #ifdef TARGET_ARCH_arm
  39 # include "nativeInst_arm.hpp"
  40 #endif
  41 #ifdef TARGET_ARCH_ppc
  42 # include "nativeInst_ppc.hpp"
  43 #endif
  44 #ifdef TARGET_ARCH_aarch32
  45 # include "nativeInst_aarch32.hpp"
  46 #endif
  47 
  48 class RegisteredProbes;
  49 typedef jlong OpaqueProbes;
  50 
  51 class DTraceJSDT : AllStatic {
  52  private:
  53 
  54   static int pd_activate(void* moduleBaseAddress, jstring module,
  55       jint providers_count, JVM_DTraceProvider* providers);
  56   static void pd_dispose(int handle);
  57   static jboolean pd_is_supported();
  58 
  59  public:
  60 
  61   static OpaqueProbes activate(
  62       jint version, jstring module_name, jint providers_count,
  63       JVM_DTraceProvider* providers, TRAPS);
  64   static jboolean is_probe_enabled(jmethodID method);
  65   static void dispose(OpaqueProbes handle);
  66   static jboolean is_supported();
  67 };
  68 
  69 class RegisteredProbes : public CHeapObj<mtInternal> {
  70  private:
  71   nmethod** _nmethods;      // all the probe methods
  72   size_t    _count;         // number of probe methods
  73   int       _helper_handle; // DTrace-assigned identifier
  74 
  75  public:
  76   RegisteredProbes(size_t count) {
  77     _count = count;
  78     _nmethods = NEW_C_HEAP_ARRAY(nmethod*, count, mtInternal);
  79   }
  80 
  81   ~RegisteredProbes() {
  82     for (size_t i = 0; i < _count; ++i) {
  83       // Let the sweeper reclaim it
  84       _nmethods[i]->make_not_entrant();
  85       _nmethods[i]->method()->clear_code();
  86     }
  87     FREE_C_HEAP_ARRAY(nmethod*, _nmethods, mtInternal);
  88     _nmethods = NULL;
  89     _count = 0;
  90   }
  91 
  92   static RegisteredProbes* toRegisteredProbes(OpaqueProbes p) {
  93     return (RegisteredProbes*)(intptr_t)p;
  94   }
  95 
  96   static OpaqueProbes toOpaqueProbes(RegisteredProbes* p) {
  97     return (OpaqueProbes)(intptr_t)p;
  98   }
  99 
 100   void set_helper_handle(int handle) { _helper_handle = handle; }
 101   int helper_handle() const { return _helper_handle; }
 102 
 103   nmethod* nmethod_at(size_t i) {
 104     assert(i >= 0 && i < _count, "bad nmethod index");
 105     return _nmethods[i];
 106   }
 107 
 108   void nmethod_at_put(size_t i, nmethod* nm) {
 109     assert(i >= 0 && i < _count, "bad nmethod index");
 110     _nmethods[i] = nm;
 111   }
 112 };
 113 
 114 #endif // SHARE_VM_RUNTIME_DTRACEJSDT_HPP