java_lang_Runtime.cpp revision 231611a78e46c2144f9c88577772b9ae265922da 
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 */
30static 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 */
44static 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 */
68static 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 */
98static 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 */
108static 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 */
119static 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
131const 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