hsdis插件查看汇编码

到 C:\Program Files\Java\jdk1.8.0_131\jre\bin\server\hsdis-amd64.dll

2、配置jvm参数
-server
-Xcomp
-XX:+UnlockDiagnosticVMOptions
-XX:CompileCommand=dontinline,*Hello.getA
-XX:CompileCommand=compileonly,*Hello.getA
-XX:+PrintAssembly

3、运行main方法，main方法中调用getA
/**
public class Hello {
private volatile int a;
private int b;

public void setA(int a) {
    this.a = a;
}

public void setB(int b) {
    this.b = b;
}


public int getA() {
    if (a == 1) {
        return 3;
    }
    return a;
}

public int getB() {
    if (b == 1) {
        return 3;
    }
    return b;
}

public static void main(String[] args) {
    new Hello().setA(1);
    new Hello().setB(1);
    new Hello().getA();
    new Hello().getB();
    System.out.println("xxx");
}

}

**/
控制台打印出assembly源码：
CompilerOracle: dontinline *Hello.getA
CompilerOracle: compileonly *Hello.getA
Loaded disassembler from C:\Program Files\Java\jdk1.8.0_131\jre\bin\server\hsdis-amd64.dll
Decoding compiled method 0x0000000002b4d750:
Code:
Argument 0 is unknown.RIP: 0x2b4d8a0 Code size: 0x00000190
[Disassembling for mach=’amd64’]
[Entry Point]
[Constants]
# {method} {0x000000001a33f138} ‘getA’ ‘()I’ in ‘com/ant/server/test/Hello’
# [sp+0x40] (sp of caller)
0x0000000002b4d8a0: mov r10d,dword ptr [rdx+8h]
0x0000000002b4d8a4: shl r10,3h
0x0000000002b4d8a8: cmp r10,rax
0x0000000002b4d8ab: jne 2a75f60h ; {runtime_call}
0x0000000002b4d8b1: nop word ptr [rax+rax+0h]
0x0000000002b4d8bc: nop
[Verified Entry Point]
0x0000000002b4d8c0: mov dword ptr [rsp+0ffffffffffffa000h],eax
0x0000000002b4d8c7: push rbp
0x0000000002b4d8c8: sub rsp,30h
0x0000000002b4d8cc: mov rax,1a33f548h ; {metadata(method data for {method} {0x000000001a33f138} ‘getA’ ‘()I’ in ‘com/ant/server/test/Hello’)}
0x0000000002b4d8d6: mov esi,dword ptr [rax+0dch]
0x0000000002b4d8dc: add esi,8h
0x0000000002b4d8df: mov dword ptr [rax+0dch],esi
0x0000000002b4d8e5: mov rax,1a33f130h ; {metadata({method} {0x000000001a33f138} ‘getA’ ‘()I’ in ‘com/ant/server/test/Hello’)}
0x0000000002b4d8ef: and esi,0h
0x0000000002b4d8f2: cmp esi,0h
0x0000000002b4d8f5: je 2b4d957h ;*aload_0
; - com.ant.server.test.Hello::getA@0 (line 20)

0x0000000002b4d8fb: mov eax,dword ptr [rdx+0ch] ;*getfield a
; - com.ant.server.test.Hello::getA@1 (line 20)

0x0000000002b4d8fe: cmp eax,1h
0x0000000002b4d901: mov rax,1a33f548h ; {metadata(method data for {method} {0x000000001a33f138} ‘getA’ ‘()I’ in ‘com/ant/server/test/Hello’)}
0x0000000002b4d90b: mov rsi,108h
0x0000000002b4d915: jne 2b4d925h
0x0000000002b4d91b: mov rsi,118h
0x0000000002b4d925: mov rdi,qword ptr [rax+rsi]
0x0000000002b4d929: lea rdi,[rdi+1h]
0x0000000002b4d92d: mov qword ptr [rax+rsi],rdi
0x0000000002b4d931: jne 2b4d948h ;*if_icmpne
; - com.ant.server.test.Hello::getA@5 (line 20)

0x0000000002b4d937: mov eax,3h
0x0000000002b4d93c: add rsp,30h
0x0000000002b4d940: pop rbp
0x0000000002b4d941: test dword ptr [750100h],eax ; {poll_return}
0x0000000002b4d947: ret ;*ireturn
; - com.ant.server.test.Hello::getA@9 (line 21)

0x0000000002b4d948: mov eax,dword ptr [rdx+0ch] ;*getfield a
; - com.ant.server.test.Hello::getA@11 (line 23)

0x0000000002b4d94b: add rsp,30h
0x0000000002b4d94f: pop rbp
0x0000000002b4d950: test dword ptr [750100h],eax ; {poll_return}
0x0000000002b4d956: ret
0x0000000002b4d957: mov qword ptr [rsp+8h],rax
0x0000000002b4d95c: mov qword ptr [rsp],0ffffffffffffffffh
0x0000000002b4d964: call 2b319e0h ; OopMap{rdx=Oop off=201}
;*synchronization entry
; - com.ant.server.test.Hello::getA@-1 (line 20)
; {runtime_call}
0x0000000002b4d969: jmp 2b4d8fbh
0x0000000002b4d96b: nop
0x0000000002b4d96c: nop
0x0000000002b4d96d: mov rax,qword ptr [r15+2a8h]
0x0000000002b4d974: mov r10,0h
0x0000000002b4d97e: mov qword ptr [r15+2a8h],r10
0x0000000002b4d985: mov r10,0h
0x0000000002b4d98f: mov qword ptr [r15+2b0h],r10
0x0000000002b4d996: add rsp,30h
0x0000000002b4d99a: pop rbp
0x0000000002b4d99b: jmp 2a9f1a0h ; {runtime_call}
[Exception Handler]
[Stub Code]
0x0000000002b4d9a0: call 2b2e620h ; {no_reloc}
0x0000000002b4d9a5: mov qword ptr [rsp+0ffffffffffffffd8h],rsp
0x0000000002b4d9aa: sub rsp,80h
0x0000000002b4d9b1: mov qword ptr [rsp+78h],rax
0x0000000002b4d9b6: mov qword ptr [rsp+70h],rcx
0x0000000002b4d9bb: mov qword ptr [rsp+68h],rdx
0x0000000002b4d9c0: mov qword ptr [rsp+60h],rbx
…………………………………………..