HSDIS
root@ubuntu:~/Downloads# ./jdk1.6.0_45/bin/java -XX:+UnlockDiagnosticVMOptions -XX:+PrintAssembly -XX:+DebugNonSafepoints HelloWorld Hello OpenJDK -1
root@ubuntu:~/Downloads# ./jdk1.6.0_45/bin/java -XX:+UnlockDiagnosticVMOptions -XX:+PrintAssembly -XX:+DebugNonSafepoints HelloWorld Hello OpenJDK -1
root@ubuntu:~/Downloads# ./jdk1.7.0_80/bin/java -XX:+UnlockDiagnosticVMOptions -XX:+PrintAssembly -XX:+DebugNonSafepoints HelloWorld Hello OpenJDK -1
root@ubuntu:~/Downloads# ./jdk1.8.0_20/bin/java -XX:+UnlockDiagnosticVMOptions -XX:+PrintAssembly -XX:+DebugNonSafepoints HelloWorld Could not load [b]hsdis-amd64.so[/b]; library not loadable; PrintAssembly is disabled Hello OpenJDK -1
下载hsdis： https://kenai.com/projects/base-hsdis/downloads
linux-hsdis-amd64.so
改名为hsdis-amd64.so，放入/root/Downloads/jdk1.8.0_20/jre/lib/amd64/server
暂时只有JDK1.8有用，1.6和1.7都没生效，具体先不找原因（可能是要类似debug版本）。
---这里1.6和1.7不生效，应该是HOTSPOT的JIT导致的，我们增加参数-Xcomp，就可以了
root@ubuntu:~/Downloads# ./jdk1.8.0_20/bin/java -XX:+UnlockDiagnosticVMOptions -XX:+PrintAssembly -XX:+DebugNonSafepoints HelloWorld > disass.log
截取indexOf部分：
Decoding compiled method 0x00007fe4b8276810:
Code:
[Entry Point]
[Constants]
# {method} {0x00007fe4b6316148} 'indexOf' '(II)I' in 'java/lang/String'
# this: rsi:rsi = 'java/lang/String'
# parm0: rdx = int
# parm1: rcx = int
# [sp+0x40] (sp of caller)
0x00007fe4b82769a0: mov 0x8(%rsi),%r10d
0x00007fe4b82769a4: shl $0x3,%r10
0x00007fe4b82769a8: cmp %rax,%r10
0x00007fe4b82769ab: jne 0x00007fe4b81b3b60 ; {runtime_call}
0x00007fe4b82769b1: nopw 0x0(%rax,%rax,1)
0x00007fe4b82769bc: xchg %ax,%ax
[Verified Entry Point]
0x00007fe4b82769c0: mov %eax,-0x14000(%rsp)
0x00007fe4b82769c7: push %rbp
0x00007fe4b82769c8: sub $0x30,%rsp
0x00007fe4b82769cc: mov $0x7fe4b64ff8b8,%rax ; {metadata(method data for {method} {0x00007fe4b6316148} 'indexOf' '(II)I' in 'java/lang/String')}
<截断>
关于hsdis，可以查看openjdk的文档:
../openjdk/hotspot/src/share/tools/hsdis/README
'hsdis': A HotSpot plugin for disassembling dynamically generated code. The files in this directory (Makefile, hsdis.[ch], hsdis-demo.c) are built independently of the HotSpot JVM. To use the plugin with a JVM, you need a new version that can load it. If the product mode of your JVM does not accept -XX:+PrintAssembly, you do not have a version that is new enough.
另外使用HSDB和SAPlugin都没有反汇编成功，后续再搞