1 /*
2 * Copyright (C) 2008 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 /*
18 * java.lang.Runtime
19 */
20 #include "Dalvik.h"
21 #include "native/InternalNativePriv.h"
22 #include <unistd.h>
23 #include <limits.h>
24
25 /*
26 * public void gc()
27 *
28 * Initiate a gc.
29 */
Dalvik_java_lang_Runtime_gc(const u4 * args,JValue * pResult)30 static void Dalvik_java_lang_Runtime_gc(const u4* args, JValue* pResult)
31 {
32 UNUSED_PARAMETER(args);
33
34 dvmCollectGarbage(false);
35 RETURN_VOID();
36 }
37
38 /*
39 * private static void nativeExit(int code, boolean isExit)
40 *
41 * Runtime.exit() calls this after doing shutdown processing. Runtime.halt()
42 * uses this as well.
43 */
Dalvik_java_lang_Runtime_nativeExit(const u4 * args,JValue * pResult)44 static void Dalvik_java_lang_Runtime_nativeExit(const u4* args,
45 JValue* pResult)
46 {
47 int status = args[0];
48 bool isExit = (args[1] != 0);
49
50 if (isExit && gDvm.exitHook != NULL) {
51 dvmChangeStatus(NULL, THREAD_NATIVE);
52 (*gDvm.exitHook)(status); // not expected to return
53 dvmChangeStatus(NULL, THREAD_RUNNING);
54 LOGW("JNI exit hook returned\n");
55 }
56 LOGD("Calling exit(%d)\n", status);
57 #if defined(WITH_JIT) && defined(WITH_JIT_TUNING)
58 dvmCompilerDumpStats();
59 #endif
60 exit(status);
61 }
62
63 /*
64 * static String nativeLoad(String filename, ClassLoader loader)
65 *
66 * Load the specified full path as a dynamic library filled with
67 * JNI-compatible methods. Returns null on success, or a failure
68 * message on failure.
69 */
Dalvik_java_lang_Runtime_nativeLoad(const u4 * args,JValue * pResult)70 static void Dalvik_java_lang_Runtime_nativeLoad(const u4* args,
71 JValue* pResult)
72 {
73 StringObject* fileNameObj = (StringObject*) args[0];
74 Object* classLoader = (Object*) args[1];
75 char* fileName = NULL;
76 StringObject* result = NULL;
77 char* reason = NULL;
78 bool success;
79
80 assert(fileNameObj != NULL);
81 fileName = dvmCreateCstrFromString(fileNameObj);
82
83 success = dvmLoadNativeCode(fileName, classLoader, &reason);
84 if (!success) {
85 const char* msg = (reason != NULL) ? reason : "unknown failure";
86 result = dvmCreateStringFromCstr(msg);
87 dvmReleaseTrackedAlloc((Object*) result, NULL);
88 }
89
90 free(reason);
91 free(fileName);
92 RETURN_PTR(result);
93 }
94
95 /*
96 * public void runFinalization(boolean forced)
97 *
98 * Requests that the VM runs finalizers for objects on the heap. If the
99 * parameter forced is true, then the VM needs to ensure finalization.
100 * Otherwise this only inspires the VM to make a best-effort attempt to
101 * run finalizers before returning, but it's not guaranteed to actually
102 * do anything.
103 */
Dalvik_java_lang_Runtime_runFinalization(const u4 * args,JValue * pResult)104 static void Dalvik_java_lang_Runtime_runFinalization(const u4* args,
105 JValue* pResult)
106 {
107 bool forced = (args[0] != 0);
108
109 dvmWaitForHeapWorkerIdle();
110 if (forced) {
111 // TODO(Google) Need to explicitly implement this,
112 // although dvmWaitForHeapWorkerIdle()
113 // should usually provide the "forced"
114 // behavior already.
115 }
116
117 RETURN_VOID();
118 }
119
120 /*
121 * public int availableProcessors()
122 *
123 * Returns the number of online processors, at least one.
124 *
125 */
Dalvik_java_lang_Runtime_availableProcessors(const u4 * args,JValue * pResult)126 static void Dalvik_java_lang_Runtime_availableProcessors(const u4* args,
127 JValue* pResult)
128 {
129 long result = 1;
130 #ifdef _SC_NPROCESSORS_ONLN
131 result = sysconf(_SC_NPROCESSORS_ONLN);
132 if (result > INT_MAX) {
133 result = INT_MAX;
134 } else if (result < 1 ) {
135 result = 1;
136 }
137 #endif
138 RETURN_INT((int)result);
139 }
140 /*
141 * public void maxMemory()
142 *
143 * Returns GC heap max memory in bytes.
144 */
Dalvik_java_lang_Runtime_maxMemory(const u4 * args,JValue * pResult)145 static void Dalvik_java_lang_Runtime_maxMemory(const u4* args, JValue* pResult)
146 {
147 unsigned int result = gDvm.heapSizeMax;
148 RETURN_LONG(result);
149 }
150
151 /*
152 * public void totalMemory()
153 *
154 * Returns GC heap total memory in bytes.
155 */
Dalvik_java_lang_Runtime_totalMemory(const u4 * args,JValue * pResult)156 static void Dalvik_java_lang_Runtime_totalMemory(const u4* args,
157 JValue* pResult)
158 {
159 int result = dvmGetHeapDebugInfo(kVirtualHeapSize);
160 RETURN_LONG(result);
161 }
162
163 /*
164 * public void freeMemory()
165 *
166 * Returns GC heap free memory in bytes.
167 */
Dalvik_java_lang_Runtime_freeMemory(const u4 * args,JValue * pResult)168 static void Dalvik_java_lang_Runtime_freeMemory(const u4* args,
169 JValue* pResult)
170 {
171 int result = dvmGetHeapDebugInfo(kVirtualHeapSize)
172 - dvmGetHeapDebugInfo(kVirtualHeapAllocated);
173 if (result < 0) {
174 result = 0;
175 }
176 RETURN_LONG(result);
177 }
178
179 const DalvikNativeMethod dvm_java_lang_Runtime[] = {
180 { "freeMemory", "()J",
181 Dalvik_java_lang_Runtime_freeMemory },
182 { "gc", "()V",
183 Dalvik_java_lang_Runtime_gc },
184 { "availableProcessors", "()I",
185 Dalvik_java_lang_Runtime_availableProcessors },
186 { "maxMemory", "()J",
187 Dalvik_java_lang_Runtime_maxMemory },
188 { "nativeExit", "(IZ)V",
189 Dalvik_java_lang_Runtime_nativeExit },
190 { "nativeLoad", "(Ljava/lang/String;Ljava/lang/ClassLoader;)Ljava/lang/String;",
191 Dalvik_java_lang_Runtime_nativeLoad },
192 { "runFinalization", "(Z)V",
193 Dalvik_java_lang_Runtime_runFinalization },
194 { "totalMemory", "()J",
195 Dalvik_java_lang_Runtime_totalMemory },
196 { NULL, NULL, NULL },
197 };
198