Mon, 05 Nov 2012 15:30:22 -0500
8001591: NMT: assertion failed: assert(rec->addr() + rec->size() <= cur->base()) failed: Can not overlap in memSnapshot.cpp
Summary: NMT should allow overlapping committed regions as long as they belong to the same reserved region
Reviewed-by: dholmes, coleenp
1 /*
2 * Copyright (c) 2005, 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 */
25 #ifndef SHARE_VM_SERVICES_ATTACHLISTENER_HPP
26 #define SHARE_VM_SERVICES_ATTACHLISTENER_HPP
28 #include "memory/allocation.hpp"
29 #include "utilities/debug.hpp"
30 #include "utilities/ostream.hpp"
32 // The AttachListener thread services a queue of operations that are enqueued
33 // by client tools. Each operation is identified by a name and has up to 3
34 // arguments. The operation name is mapped to a function which performs the
35 // operation. The function is called with an outputStream which is can use to
36 // write any result data (for examples the properties command serializes
37 // properties names and values to the output stream). When the function
38 // complets the result value and any result data is returned to the client
39 // tool.
41 #ifndef SERVICES_KERNEL
43 class AttachOperation;
45 typedef jint (*AttachOperationFunction)(AttachOperation* op, outputStream* out);
47 struct AttachOperationFunctionInfo {
48 const char* name;
49 AttachOperationFunction func;
50 };
51 #endif // SERVICES_KERNEL
53 class AttachListener: AllStatic {
54 public:
55 static void init() NOT_SERVICES_RETURN;
56 static void abort() NOT_SERVICES_RETURN;
58 // invoke to perform clean-up tasks when all clients detach
59 static void detachall() NOT_SERVICES_RETURN;
61 // indicates if the Attach Listener needs to be created at startup
62 static bool init_at_startup() NOT_SERVICES_RETURN_(false);
64 // indicates if we have a trigger to start the Attach Listener
65 static bool is_init_trigger() NOT_SERVICES_RETURN_(false);
67 #if !INCLUDE_SERVICES
68 static bool is_attach_supported() { return false; }
69 #else
70 private:
71 static volatile bool _initialized;
73 public:
74 static bool is_initialized() { return _initialized; }
75 static void set_initialized() { _initialized = true; }
77 // indicates if this VM supports attach-on-demand
78 static bool is_attach_supported() { return !DisableAttachMechanism; }
80 // platform specific initialization
81 static int pd_init();
83 // platform specific operation
84 static AttachOperationFunctionInfo* pd_find_operation(const char* name);
86 // platform specific flag change
87 static jint pd_set_flag(AttachOperation* op, outputStream* out);
89 // platform specific detachall
90 static void pd_detachall();
92 // platform specific data dump
93 static void pd_data_dump();
95 // dequeue the next operation
96 static AttachOperation* dequeue();
97 #endif // !INCLUDE_SERVICES
98 };
100 #if INCLUDE_SERVICES
101 class AttachOperation: public CHeapObj<mtInternal> {
102 public:
103 enum {
104 name_length_max = 16, // maximum length of name
105 arg_length_max = 1024, // maximum length of argument
106 arg_count_max = 3 // maximum number of arguments
107 };
109 // name of special operation that can be enqueued when all
110 // clients detach
111 static char* detachall_operation_name() { return (char*)"detachall"; }
113 private:
114 char _name[name_length_max+1];
115 char _arg[arg_count_max][arg_length_max+1];
117 public:
118 const char* name() const { return _name; }
120 // set the operation name
121 void set_name(char* name) {
122 assert(strlen(name) <= name_length_max, "exceeds maximum name length");
123 strcpy(_name, name);
124 }
126 // get an argument value
127 const char* arg(int i) const {
128 assert(i>=0 && i<arg_count_max, "invalid argument index");
129 return _arg[i];
130 }
132 // set an argument value
133 void set_arg(int i, char* arg) {
134 assert(i>=0 && i<arg_count_max, "invalid argument index");
135 if (arg == NULL) {
136 _arg[i][0] = '\0';
137 } else {
138 assert(strlen(arg) <= arg_length_max, "exceeds maximum argument length");
139 strcpy(_arg[i], arg);
140 }
141 }
143 // create an operation of a given name
144 AttachOperation(char* name) {
145 set_name(name);
146 for (int i=0; i<arg_count_max; i++) {
147 set_arg(i, NULL);
148 }
149 }
151 // complete operation by sending result code and any result data to the client
152 virtual void complete(jint result, bufferedStream* result_stream) = 0;
153 };
154 #endif // INCLUDE_SERVICES
156 #endif // SHARE_VM_SERVICES_ATTACHLISTENER_HPP