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annotate src/share/vm/runtime/dtraceJSDT.hpp @ 1721:413ad0331a0c

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6977924: Changes for 6975078 produce build error with certain gcc versions Summary: The changes introduced for 6975078 assign badHeapOopVal to the _allocation field in the ResourceObj class. In 32 bit linux builds with certain versions of gcc this assignment will be flagged as an error while compiling allocation.cpp. In 32 bit builds the constant value badHeapOopVal (which is cast to an intptr_t) is negative. The _allocation field is typed as an unsigned intptr_t and gcc catches this as an error. Reviewed-by: jcoomes, ysr, phh
author johnc
date Wed, 18 Aug 2010 10:59:06 -0700
parents c18cbe5936b8
children f95d63e2154a
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1 /*
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2 * Copyright (c) 1997, 2008, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 *
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23 */
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24
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25 class RegisteredProbes;
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26 typedef jlong OpaqueProbes;
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27
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28 class DTraceJSDT : AllStatic {
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29 private:
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30
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31 static int pd_activate(void* moduleBaseAddress, jstring module,
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32 jint providers_count, JVM_DTraceProvider* providers);
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33 static void pd_dispose(int handle);
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34 static jboolean pd_is_supported();
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35
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36 public:
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37
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38 static OpaqueProbes activate(
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39 jint version, jstring module_name, jint providers_count,
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40 JVM_DTraceProvider* providers, TRAPS);
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41 static jboolean is_probe_enabled(jmethodID method);
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42 static void dispose(OpaqueProbes handle);
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43 static jboolean is_supported();
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44 };
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45
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46 class RegisteredProbes : public CHeapObj {
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47 private:
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48 nmethod** _nmethods; // all the probe methods
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49 size_t _count; // number of probe methods
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50 int _helper_handle; // DTrace-assigned identifier
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51
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52 public:
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53 RegisteredProbes(size_t count) {
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54 _count = count;
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55 _nmethods = NEW_C_HEAP_ARRAY(nmethod*, count);
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56 }
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57
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58 ~RegisteredProbes() {
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59 for (size_t i = 0; i < _count; ++i) {
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60 // Let the sweeper reclaim it
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61 _nmethods[i]->make_not_entrant();
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62 _nmethods[i]->method()->clear_code();
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63 }
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64 FREE_C_HEAP_ARRAY(nmethod*, _nmethods);
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65 _nmethods = NULL;
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66 _count = 0;
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67 }
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68
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69 static RegisteredProbes* toRegisteredProbes(OpaqueProbes p) {
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70 return (RegisteredProbes*)(intptr_t)p;
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71 }
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72
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73 static OpaqueProbes toOpaqueProbes(RegisteredProbes* p) {
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74 return (OpaqueProbes)(intptr_t)p;
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75 }
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76
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77 void set_helper_handle(int handle) { _helper_handle = handle; }
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78 int helper_handle() const { return _helper_handle; }
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79
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80 nmethod* nmethod_at(size_t i) {
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81 assert(i >= 0 && i < _count, "bad nmethod index");
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82 return _nmethods[i];
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83 }
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84
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85 void nmethod_at_put(size_t i, nmethod* nm) {
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86 assert(i >= 0 && i < _count, "bad nmethod index");
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87 _nmethods[i] = nm;
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88 }
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89 };