Mercurial > hg > truffle
annotate src/share/vm/services/attachListener.hpp @ 1721:413ad0331a0c
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 |
| rev | line source |
|---|---|
| 0 | 1 /* |
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2 * Copyright (c) 2005, 2006, Oracle and/or its affiliates. All rights reserved. |
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| 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
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| 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 * | |
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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. |
| 0 | 22 * |
| 23 */ | |
| 24 | |
| 25 // The AttachListener thread services a queue of operations that are enqueued | |
| 26 // by client tools. Each operation is identified by a name and has up to 3 | |
| 27 // arguments. The operation name is mapped to a function which performs the | |
| 28 // operation. The function is called with an outputStream which is can use to | |
| 29 // write any result data (for examples the properties command serializes | |
| 30 // properties names and values to the output stream). When the function | |
| 31 // complets the result value and any result data is returned to the client | |
| 32 // tool. | |
| 33 | |
| 34 #ifndef SERVICES_KERNEL | |
| 35 | |
| 36 class AttachOperation; | |
| 37 | |
| 38 typedef jint (*AttachOperationFunction)(AttachOperation* op, outputStream* out); | |
| 39 | |
| 40 struct AttachOperationFunctionInfo { | |
| 41 const char* name; | |
| 42 AttachOperationFunction func; | |
| 43 }; | |
| 44 #endif // SERVICES_KERNEL | |
| 45 | |
| 46 class AttachListener: AllStatic { | |
| 47 public: | |
| 48 static void init() KERNEL_RETURN; | |
| 49 static void abort() KERNEL_RETURN; | |
| 50 | |
| 51 // invoke to perform clean-up tasks when all clients detach | |
| 52 static void detachall() KERNEL_RETURN; | |
| 53 | |
| 54 // indicates if the Attach Listener needs to be created at startup | |
| 55 static bool init_at_startup() KERNEL_RETURN_(return false;); | |
| 56 | |
| 57 // indicates if we have a trigger to start the Attach Listener | |
| 58 static bool is_init_trigger() KERNEL_RETURN_(return false;); | |
| 59 | |
| 60 #ifdef SERVICES_KERNEL | |
| 61 static bool is_attach_supported() { return false; } | |
| 62 #else // SERVICES_KERNEL | |
| 63 private: | |
| 64 static volatile bool _initialized; | |
| 65 | |
| 66 public: | |
| 67 static bool is_initialized() { return _initialized; } | |
| 68 static void set_initialized() { _initialized = true; } | |
| 69 | |
| 70 // indicates if this VM supports attach-on-demand | |
| 71 static bool is_attach_supported() { return !DisableAttachMechanism; } | |
| 72 | |
| 73 // platform specific initialization | |
| 74 static int pd_init(); | |
| 75 | |
| 76 // platform specific operation | |
| 77 static AttachOperationFunctionInfo* pd_find_operation(const char* name); | |
| 78 | |
| 79 // platform specific flag change | |
| 80 static jint pd_set_flag(AttachOperation* op, outputStream* out); | |
| 81 | |
| 82 // platform specific detachall | |
| 83 static void pd_detachall(); | |
| 84 | |
| 85 // platform specific data dump | |
| 86 static void pd_data_dump(); | |
| 87 | |
| 88 // dequeue the next operation | |
| 89 static AttachOperation* dequeue(); | |
| 90 #endif // SERVICES_KERNEL | |
| 91 }; | |
| 92 | |
| 93 #ifndef SERVICES_KERNEL | |
| 94 class AttachOperation: public CHeapObj { | |
| 95 public: | |
| 96 enum { | |
| 97 name_length_max = 16, // maximum length of name | |
| 98 arg_length_max = 1024, // maximum length of argument | |
| 99 arg_count_max = 3 // maximum number of arguments | |
| 100 }; | |
| 101 | |
| 102 // name of special operation that can be enqueued when all | |
| 103 // clients detach | |
| 104 static char* detachall_operation_name() { return (char*)"detachall"; } | |
| 105 | |
| 106 private: | |
| 107 char _name[name_length_max+1]; | |
| 108 char _arg[arg_count_max][arg_length_max+1]; | |
| 109 | |
| 110 public: | |
| 111 const char* name() const { return _name; } | |
| 112 | |
| 113 // set the operation name | |
| 114 void set_name(char* name) { | |
| 115 assert(strlen(name) <= name_length_max, "exceeds maximum name length"); | |
| 116 strcpy(_name, name); | |
| 117 } | |
| 118 | |
| 119 // get an argument value | |
| 120 const char* arg(int i) const { | |
| 121 assert(i>=0 && i<arg_count_max, "invalid argument index"); | |
| 122 return _arg[i]; | |
| 123 } | |
| 124 | |
| 125 // set an argument value | |
| 126 void set_arg(int i, char* arg) { | |
| 127 assert(i>=0 && i<arg_count_max, "invalid argument index"); | |
| 128 if (arg == NULL) { | |
| 129 _arg[i][0] = '\0'; | |
| 130 } else { | |
| 131 assert(strlen(arg) <= arg_length_max, "exceeds maximum argument length"); | |
| 132 strcpy(_arg[i], arg); | |
| 133 } | |
| 134 } | |
| 135 | |
| 136 // create an operation of a given name | |
| 137 AttachOperation(char* name) { | |
| 138 set_name(name); | |
| 139 for (int i=0; i<arg_count_max; i++) { | |
| 140 set_arg(i, NULL); | |
| 141 } | |
| 142 } | |
| 143 | |
| 144 // complete operation by sending result code and any result data to the client | |
| 145 virtual void complete(jint result, bufferedStream* result_stream) = 0; | |
| 146 }; | |
| 147 #endif // SERVICES_KERNEL |