github/arthas
4
0
Fork 0
mirror of https://github.com/alibaba/arthas.git synced 2024-04-21 10:21:39 +00:00
Code Issues Packages Projects Releases Wiki Activity

simplify tag generation mechanism

Browse Source
This commit is contained in:
hengyunabc
2021-05-07 19:38:36 +08:00
parent 35581b1cf4
commit aeede28cb9
2 changed files with 10 additions and 23 deletions
Download Patch File Download Diff File Expand all files Collapse all files
arthas-vmtool/src/main/java/arthas/VmTool.java
+4 -4
View File
@@ -41,12 +41,12 @@ public class VmTool implements VmToolMXBean {
*/
private static native String check0();
private static native void forceGc0();
private static synchronized native void forceGc0();
/**
* 获取某个class在jvm中当前所有存活实例
*/
private static native <T> T[] getInstances0(Class<T> klass);
private static synchronized native <T> T[] getInstances0(Class<T> klass);
/**
* 统计某个class在jvm中当前所有存活实例的总占用内存，单位：Byte
@@ -61,14 +61,14 @@ public class VmTool implements VmToolMXBean {
/**
* 统计某个class在jvm中当前所有存活实例的总个数
*/
private static native long countInstances0(Class<?> klass);
private static synchronized native long countInstances0(Class<?> klass);
/**
* 获取所有已加载的类
* @param klass 这个参数必须是 Class.class
* @return
*/
private static native Class<?>[] getAllLoadedClasses0(Class<?> klass);
private static synchronized native Class<?>[] getAllLoadedClasses0(Class<?> klass);
@Override
public String check() {
arthas-vmtool/src/main/native/src/jni-library.cpp
+6 -19
View File
@@ -6,6 +6,7 @@
static jvmtiEnv *jvmti;
static jlong tagCounter = 0;
extern "C"
int init_agent(JavaVM *vm, void *reserved) {
@@ -57,19 +58,8 @@ Java_arthas_VmTool_check0(JNIEnv *env, jclass thisClass) {
}
extern "C"
jobject createJavaInstance(JNIEnv *env, jclass javaClass) {
//找到java类的构造方法
jmethodID construct = env->GetMethodID(javaClass, "<init>", "()V");
//生成java类实例
return env->NewObject(javaClass, construct, "");
}
extern "C"
jlong getClassHashCode(JNIEnv *env, jclass javaClass) {
//找到java类的hashCode方法
jmethodID hashCodeMethod = env->GetMethodID(javaClass, "hashCode", "()I");
//生成java类实例
return env->CallLongMethod(javaClass, hashCodeMethod);
jlong getTag() {
return ++tagCounter;
}
extern "C"
@@ -83,8 +73,7 @@ HeapObjectCallback(jlong class_tag, jlong size, jlong *tag_ptr, void *user_data)
extern "C"
JNIEXPORT jobjectArray JNICALL
Java_arthas_VmTool_getInstances0(JNIEnv *env, jclass thisClass, jclass klass) {
//这里用hashCode作为标记
jlong tag = getClassHashCode(env, klass);
jlong tag = getTag();
jvmtiError error = jvmti->IterateOverInstancesOfClass(klass, JVMTI_HEAP_OBJECT_EITHER,
HeapObjectCallback, &tag);
if (error) {
@@ -112,8 +101,7 @@ Java_arthas_VmTool_getInstances0(JNIEnv *env, jclass thisClass, jclass klass) {
extern "C"
JNIEXPORT jlong JNICALL
Java_arthas_VmTool_sumInstanceSize0(JNIEnv *env, jclass thisClass, jclass klass) {
//这里用hashCode作为标记
jlong tag = getClassHashCode(env, klass);
jlong tag = getTag();
jvmtiError error = jvmti->IterateOverInstancesOfClass(klass, JVMTI_HEAP_OBJECT_EITHER,
HeapObjectCallback, &tag);
if (error) {
@@ -154,8 +142,7 @@ JNIEXPORT jlong JNICALL Java_arthas_VmTool_getInstanceSize0
extern "C"
JNIEXPORT jlong JNICALL
Java_arthas_VmTool_countInstances0(JNIEnv *env, jclass thisClass, jclass klass) {
//这里用hashCode作为标记
jlong tag = getClassHashCode(env, klass);
jlong tag = getTag();
jvmtiError error = jvmti->IterateOverInstancesOfClass(klass, JVMTI_HEAP_OBJECT_EITHER,
HeapObjectCallback, &tag);
if (error) {