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 
  45 class RegisteredProbes;
  46 typedef jlong OpaqueProbes;
  47 
  48 class DTraceJSDT : AllStatic {
  49  private:
  50 
  51   static int pd_activate(void* moduleBaseAddress, jstring module,
  52       jint providers_count, JVM_DTraceProvider* providers);
  53   static void pd_dispose(int handle);
  54   static jboolean pd_is_supported();
  55 
  56  public:
  57 
  58   static OpaqueProbes activate(
  59       jint version, jstring module_name, jint providers_count,
  60       JVM_DTraceProvider* providers, TRAPS);
  61   static jboolean is_probe_enabled(jmethodID method);
  62   static void dispose(OpaqueProbes handle);
  63   static jboolean is_supported();
  64 };
  65 
  66 class RegisteredProbes : public CHeapObj<mtInternal> {
  67  private:
  68   nmethod** _nmethods;      // all the probe methods
  69   size_t    _count;         // number of probe methods
  70   int       _helper_handle; // DTrace-assigned identifier
  71 
  72  public:
  73   RegisteredProbes(size_t count) {
  74     _count = count;
  75     _nmethods = NEW_C_HEAP_ARRAY(nmethod*, count, mtInternal);
  76   }
  77 
  78   ~RegisteredProbes() {
  79     for (size_t i = 0; i < _count; ++i) {
  80       // Let the sweeper reclaim it
  81       _nmethods[i]->make_not_entrant();
  82       _nmethods[i]->method()->clear_code();
  83     }
  84     FREE_C_HEAP_ARRAY(nmethod*, _nmethods, mtInternal);
  85     _nmethods = NULL;
  86     _count = 0;
  87   }
  88 
  89   static RegisteredProbes* toRegisteredProbes(OpaqueProbes p) {
  90     return (RegisteredProbes*)(intptr_t)p;
  91   }
  92 
  93   static OpaqueProbes toOpaqueProbes(RegisteredProbes* p) {
  94     return (OpaqueProbes)(intptr_t)p;
  95   }
  96 
  97   void set_helper_handle(int handle) { _helper_handle = handle; }
  98   int helper_handle() const { return _helper_handle; }
  99 
 100   nmethod* nmethod_at(size_t i) {
 101     assert(i >= 0 && i < _count, "bad nmethod index");
 102     return _nmethods[i];
 103   }
 104 
 105   void nmethod_at_put(size_t i, nmethod* nm) {
 106     assert(i >= 0 && i < _count, "bad nmethod index");
 107     _nmethods[i] = nm;
 108   }
 109 };
 110 
 111 #endif // SHARE_VM_RUNTIME_DTRACEJSDT_HPP