Java本机方法源代码 [英] Java native method source code

问题描述

我在哪里可以下载java原生方法源代码？例如，我想知道 System.arraycopy（）的源代码，但我找不到。

Where can I download the java native method source code? For example, I want to know the source code of System.arraycopy(), but I can't find.

推荐答案

您可以在这里下载OpenJdk源代码 。

You can download OpenJdk source code here.

在文件夹 jdk\src\share 中，您可以获得源代码。

In the folder jdk\src\share you can get source code.

jdk\src\share\\\
ative 是用c和c ++编写的natice方法源。

jdk\src\share\native is the natice method souce write in c and c++.

1. jdk\src\linux linux的来源。


2. jdk\src\windows Windows的来源。


3. jdk\src\solaris 来自solaris的源。


4. jd\src\share 常见来源。

1. jdk\src\linux source for linux.
2. jdk\src\windows source for windows.
3. jdk\src\solaris souce for solaris.
4. jd\src\share common source.

例如：System.arrayCopy（）;

eg: System.arrayCopy();

int file hotspot\src\ share \vm\oops\objArrayKlass.cpp 第168行：

int file hotspot\src\share\vm\oops\objArrayKlass.cpp line 168:

void objArrayKlass::copy_array(arrayOop s, int src_pos, arrayOop d,
                           int dst_pos, int length, TRAPS) {
assert(s->is_objArray(), "must be obj array");

if (!d->is_objArray()) {
  THROW(vmSymbols::java_lang_ArrayStoreException());
}

// Check is all offsets and lengths are non negative
if (src_pos < 0 || dst_pos < 0 || length < 0) {
  THROW(vmSymbols::java_lang_ArrayIndexOutOfBoundsException());
}
// Check if the ranges are valid
if  ( (((unsigned int) length + (unsigned int) src_pos) > (unsigned int) s->length())
   || (((unsigned int) length + (unsigned int) dst_pos) > (unsigned int) d->length()) )   {
  THROW(vmSymbols::java_lang_ArrayIndexOutOfBoundsException());
}

// Special case. Boundary cases must be checked first
// This allows the following call: copy_array(s, s.length(), d.length(), 0).
// This is correct, since the position is supposed to be an 'in between point', i.e., s.length(),
// points to the right of the last element.
if (length==0) {
  return;
}
if (UseCompressedOops) {
  narrowOop* const src = objArrayOop(s)->obj_at_addr<narrowOop>(src_pos);
  narrowOop* const dst = objArrayOop(d)->obj_at_addr<narrowOop>(dst_pos);
  do_copy<narrowOop>(s, src, d, dst, length, CHECK);
} else {
  oop* const src = objArrayOop(s)->obj_at_addr<oop>(src_pos);
  oop* const dst = objArrayOop(d)->obj_at_addr<oop>(dst_pos);
  do_copy<oop> (s, src, d, dst, length, CHECK);
  }
}

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