Fri, 13 Jul 2012 20:14:27 -0400
Merge
1 /*
2 * Copyright (c) 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 #include "precompiled.hpp"
27 #include "memory/universe.hpp"
28 #include "oops/oop.inline.hpp"
30 #include "classfile/symbolTable.hpp"
32 #include "prims/whitebox.hpp"
33 #include "prims/wbtestmethods/parserTests.hpp"
35 #include "runtime/interfaceSupport.hpp"
36 #include "runtime/os.hpp"
37 #include "utilities/debug.hpp"
39 #ifndef SERIALGC
40 #include "gc_implementation/g1/concurrentMark.hpp"
41 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp"
42 #include "gc_implementation/g1/heapRegionRemSet.hpp"
43 #endif // !SERIALGC
45 bool WhiteBox::_used = false;
47 WB_ENTRY(jlong, WB_GetObjectAddress(JNIEnv* env, jobject o, jobject obj))
48 return (jlong)(void*)JNIHandles::resolve(obj);
49 WB_END
51 WB_ENTRY(jint, WB_GetHeapOopSize(JNIEnv* env, jobject o))
52 return heapOopSize;
53 WB_END
55 #ifndef SERIALGC
56 WB_ENTRY(jboolean, WB_G1IsHumongous(JNIEnv* env, jobject o, jobject obj))
57 G1CollectedHeap* g1 = G1CollectedHeap::heap();
58 oop result = JNIHandles::resolve(obj);
59 const HeapRegion* hr = g1->heap_region_containing(result);
60 return hr->isHumongous();
61 WB_END
63 WB_ENTRY(jlong, WB_G1NumFreeRegions(JNIEnv* env, jobject o))
64 G1CollectedHeap* g1 = G1CollectedHeap::heap();
65 size_t nr = g1->free_regions();
66 return (jlong)nr;
67 WB_END
69 WB_ENTRY(jboolean, WB_G1InConcurrentMark(JNIEnv* env, jobject o))
70 G1CollectedHeap* g1 = G1CollectedHeap::heap();
71 ConcurrentMark* cm = g1->concurrent_mark();
72 return cm->concurrent_marking_in_progress();
73 WB_END
75 WB_ENTRY(jint, WB_G1RegionSize(JNIEnv* env, jobject o))
76 return (jint)HeapRegion::GrainBytes;
77 WB_END
78 #endif // !SERIALGC
80 //Some convenience methods to deal with objects from java
81 int WhiteBox::offset_for_field(const char* field_name, oop object,
82 Symbol* signature_symbol) {
83 assert(field_name != NULL && strlen(field_name) > 0, "Field name not valid");
84 Thread* THREAD = Thread::current();
86 //Get the class of our object
87 klassOop arg_klass = object->klass();
88 //Turn it into an instance-klass
89 instanceKlass* ik = instanceKlass::cast(arg_klass);
91 //Create symbols to look for in the class
92 TempNewSymbol name_symbol = SymbolTable::lookup(field_name, (int) strlen(field_name),
93 THREAD);
95 //To be filled in with an offset of the field we're looking for
96 fieldDescriptor fd;
98 klassOop res = ik->find_field(name_symbol, signature_symbol, &fd);
99 if (res == NULL) {
100 tty->print_cr("Invalid layout of %s at %s", ik->external_name(),
101 name_symbol->as_C_string());
102 fatal("Invalid layout of preloaded class");
103 }
105 //fetch the field at the offset we've found
106 int dest_offset = fd.offset();
108 return dest_offset;
109 }
112 const char* WhiteBox::lookup_jstring(const char* field_name, oop object) {
113 int offset = offset_for_field(field_name, object,
114 vmSymbols::string_signature());
115 oop string = object->obj_field(offset);
116 if (string == NULL) {
117 return NULL;
118 }
119 const char* ret = java_lang_String::as_utf8_string(string);
120 return ret;
121 }
123 bool WhiteBox::lookup_bool(const char* field_name, oop object) {
124 int offset =
125 offset_for_field(field_name, object, vmSymbols::bool_signature());
126 bool ret = (object->bool_field(offset) == JNI_TRUE);
127 return ret;
128 }
131 #define CC (char*)
133 static JNINativeMethod methods[] = {
134 {CC"getObjectAddress", CC"(Ljava/lang/Object;)J", (void*)&WB_GetObjectAddress },
135 {CC"getHeapOopSize", CC"()I", (void*)&WB_GetHeapOopSize },
136 {CC "parseCommandLine",
137 CC "(Ljava/lang/String;[Lsun/hotspot/parser/DiagnosticCommand;)[Ljava/lang/Object;",
138 (void*) &WB_ParseCommandLine
139 },
140 #ifndef SERIALGC
141 {CC"g1InConcurrentMark", CC"()Z", (void*)&WB_G1InConcurrentMark},
142 {CC"g1IsHumongous", CC"(Ljava/lang/Object;)Z", (void*)&WB_G1IsHumongous },
143 {CC"g1NumFreeRegions", CC"()J", (void*)&WB_G1NumFreeRegions },
144 {CC"g1RegionSize", CC"()I", (void*)&WB_G1RegionSize },
145 #endif // !SERIALGC
146 };
148 #undef CC
150 JVM_ENTRY(void, JVM_RegisterWhiteBoxMethods(JNIEnv* env, jclass wbclass))
151 {
152 if (WhiteBoxAPI) {
153 // Make sure that wbclass is loaded by the null classloader
154 instanceKlassHandle ikh = instanceKlassHandle(JNIHandles::resolve(wbclass)->klass());
155 Handle loader(ikh->class_loader());
156 if (loader.is_null()) {
157 ThreadToNativeFromVM ttnfv(thread); // can't be in VM when we call JNI
158 jint result = env->RegisterNatives(wbclass, methods, sizeof(methods)/sizeof(methods[0]));
159 if (result == 0) {
160 WhiteBox::set_used();
161 }
162 }
163 }
164 }
165 JVM_END