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();
35 RETURN_VOID();
36 }
37
38 /*
39 * private static void nativeExit(int code)
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 if (gDvm.exitHook != NULL) {
49 dvmChangeStatus(NULL, THREAD_NATIVE);
50 (*gDvm.exitHook)(status); // not expected to return
51 dvmChangeStatus(NULL, THREAD_RUNNING);
52 ALOGW("JNI exit hook returned");
53 }
54 #if defined(WITH_JIT) && defined(WITH_JIT_TUNING)
55 dvmCompilerDumpStats();
56 #endif
57 ALOGD("Calling exit(%d)", status);
58 exit(status);
59 }
60
61 /*
62 * static String nativeLoad(String filename, ClassLoader loader)
63 *
64 * Load the specified full path as a dynamic library filled with
65 * JNI-compatible methods. Returns null on success, or a failure
66 * message on failure.
67 */
Dalvik_java_lang_Runtime_nativeLoad(const u4 * args,JValue * pResult)68 static void Dalvik_java_lang_Runtime_nativeLoad(const u4* args,
69 JValue* pResult)
70 {
71 StringObject* fileNameObj = (StringObject*) args[0];
72 Object* classLoader = (Object*) args[1];
73 char* fileName = NULL;
74 StringObject* result = NULL;
75 char* reason = NULL;
76 bool success;
77
78 assert(fileNameObj != NULL);
79 fileName = dvmCreateCstrFromString(fileNameObj);
80
81 success = dvmLoadNativeCode(fileName, classLoader, &reason);
82 if (!success) {
83 const char* msg = (reason != NULL) ? reason : "unknown failure";
84 result = dvmCreateStringFromCstr(msg);
85 dvmReleaseTrackedAlloc((Object*) result, NULL);
86 }
87
88 free(reason);
89 free(fileName);
90 RETURN_PTR(result);
91 }
92
93 /*
94 * public long maxMemory()
95 *
96 * Returns GC heap max memory in bytes.
97 */
Dalvik_java_lang_Runtime_maxMemory(const u4 * args,JValue * pResult)98 static void Dalvik_java_lang_Runtime_maxMemory(const u4* args, JValue* pResult)
99 {
100 RETURN_LONG(dvmGetHeapDebugInfo(kVirtualHeapMaximumSize));
101 }
102
103 /*
104 * public long totalMemory()
105 *
106 * Returns GC heap total memory in bytes.
107 */
Dalvik_java_lang_Runtime_totalMemory(const u4 * args,JValue * pResult)108 static void Dalvik_java_lang_Runtime_totalMemory(const u4* args,
109 JValue* pResult)
110 {
111 RETURN_LONG(dvmGetHeapDebugInfo(kVirtualHeapSize));
112 }
113
114 /*
115 * public long freeMemory()
116 *
117 * Returns GC heap free memory in bytes.
118 */
Dalvik_java_lang_Runtime_freeMemory(const u4 * args,JValue * pResult)119 static void Dalvik_java_lang_Runtime_freeMemory(const u4* args,
120 JValue* pResult)
121 {
122 size_t size = dvmGetHeapDebugInfo(kVirtualHeapSize);
123 size_t allocated = dvmGetHeapDebugInfo(kVirtualHeapAllocated);
124 long long result = size - allocated;
125 if (result < 0) {
126 result = 0;
127 }
128 RETURN_LONG(result);
129 }
130
131 const DalvikNativeMethod dvm_java_lang_Runtime[] = {
132 { "freeMemory", "()J",
133 Dalvik_java_lang_Runtime_freeMemory },
134 { "gc", "()V",
135 Dalvik_java_lang_Runtime_gc },
136 { "maxMemory", "()J",
137 Dalvik_java_lang_Runtime_maxMemory },
138 { "nativeExit", "(I)V",
139 Dalvik_java_lang_Runtime_nativeExit },
140 { "nativeLoad", "(Ljava/lang/String;Ljava/lang/ClassLoader;)Ljava/lang/String;",
141 Dalvik_java_lang_Runtime_nativeLoad },
142 { "totalMemory", "()J",
143 Dalvik_java_lang_Runtime_totalMemory },
144 { NULL, NULL, NULL },
145 };
146