编译前CLASS信息：
public class LockExample { private static int i; private static int j; private static int k; private static volatile int state; public static void main(String[] args) { LockExample lockExample = new LockExample(); lockExample.innerSynch(); } public LockExample(){ i = 2; state = 1; } public void innerSynch(){ synchronized(this){ System.out.println("[ get inner lock ] success"); i++; j++; state ++; k++; try { this.wait(); }catch (InterruptedException ex){ } notifyAll(); System.out.println("[ notifyAll ] ... ..."); } } }
通过IDEA 编译源码获得 LockExample.class文件
即执行：C:UsersAdministratorDesktop> javac LockExample.java
然后，基于Class文件，再执行如下指令：
# 指令格式：javap -v -p Class文件名字，不需要加.class C:UsersAdministratorDesktop>javap -v -p LockExample
控制台就会打印出该类的JVM指令：
1 com.clouds.example.service.lock.LockExample 2 Classfile /C:/Users/Administrator/Desktop/LockExample.class 3 Last modified 2020-8-31; size 995 bytes 4 MD5 checksum 60688e87f173f11c4571151844f8d0bf 5 Compiled from "LockExample.java" 6 public class com.clouds.example.service.lock.LockExample 7 minor version: 0 8 major version: 52 9 flags: ACC_PUBLIC, ACC_SUPER 10 Constant pool: 11 #1 = Class #36 // com/clouds/example/service/lock/LockExample 12 #2 = Methodref #1.#37 // com/clouds/example/service/lock/LockExample."<init>":()V 13 #3 = Methodref #1.#38 // com/clouds/example/service/lock/LockExample.innerSynch:()V 14 #4 = Methodref #16.#37 // java/lang/Object."<init>":()V 15 #5 = Fieldref #1.#39 // com/clouds/example/service/lock/LockExample.i:I 16 #6 = Fieldref #1.#40 // com/clouds/example/service/lock/LockExample.state:I 17 #7 = Fieldref #41.#42 // java/lang/System.out:Ljava/io/PrintStream; 18 #8 = String #43 // [ get inner lock ] success 19 #9 = Methodref #44.#45 // java/io/PrintStream.println:(Ljava/lang/String;)V 20 #10 = Fieldref #1.#46 // com/clouds/example/service/lock/LockExample.j:I 21 #11 = Fieldref #1.#47 // com/clouds/example/service/lock/LockExample.k:I 22 #12 = Methodref #16.#48 // java/lang/Object.wait:()V 23 #13 = Class #49 // java/lang/InterruptedException 24 #14 = Methodref #16.#50 // java/lang/Object.notifyAll:()V 25 #15 = String #51 // [ notifyAll ] ... ... 26 #16 = Class #52 // java/lang/Object 27 #17 = Utf8 i 28 #18 = Utf8 I 29 #19 = Utf8 j 30 #20 = Utf8 k 31 #21 = Utf8 state 32 #22 = Utf8 main 33 #23 = Utf8 ([Ljava/lang/String;)V 34 #24 = Utf8 Code 35 #25 = Utf8 LineNumberTable 36 #26 = Utf8 <init> 37 #27 = Utf8 ()V 38 #28 = Utf8 innerSynch 39 #29 = Utf8 StackMapTable 40 #30 = Class #36 // com/clouds/example/service/lock/LockExample 41 #31 = Class #52 // java/lang/Object 42 #32 = Class #49 // java/lang/InterruptedException 43 #33 = Class #53 // java/lang/Throwable 44 #34 = Utf8 SourceFile 45 #35 = Utf8 LockExample.java 46 #36 = Utf8 com/clouds/example/service/lock/LockExample 47 #37 = NameAndType #26:#27 // "<init>":()V 48 #38 = NameAndType #28:#27 // innerSynch:()V 49 #39 = NameAndType #17:#18 // i:I 50 #40 = NameAndType #21:#18 // state:I 51 #41 = Class #54 // java/lang/System 52 #42 = NameAndType #55:#56 // out:Ljava/io/PrintStream; 53 #43 = Utf8 [ get inner lock ] success 54 #44 = Class #57 // java/io/PrintStream 55 #45 = NameAndType #58:#59 // println:(Ljava/lang/String;)V 56 #46 = NameAndType #19:#18 // j:I 57 #47 = NameAndType #20:#18 // k:I 58 #48 = NameAndType #60:#27 // wait:()V 59 #49 = Utf8 java/lang/InterruptedException 60 #50 = NameAndType #61:#27 // notifyAll:()V 61 #51 = Utf8 [ notifyAll ] ... ... 62 #52 = Utf8 java/lang/Object 63 #53 = Utf8 java/lang/Throwable 64 #54 = Utf8 java/lang/System 65 #55 = Utf8 out 66 #56 = Utf8 Ljava/io/PrintStream; 67 #57 = Utf8 java/io/PrintStream 68 #58 = Utf8 println 69 #59 = Utf8 (Ljava/lang/String;)V 70 #60 = Utf8 wait 71 #61 = Utf8 notifyAll 72 { 73 private static int i; 74 descriptor: I 75 flags: ACC_PRIVATE, ACC_STATIC 76 77 private static int j; 78 descriptor: I 79 flags: ACC_PRIVATE, ACC_STATIC 80 81 private static int k; 82 descriptor: I 83 flags: ACC_PRIVATE, ACC_STATIC 84 85 private static volatile int state; 86 descriptor: I 87 flags: ACC_PRIVATE, ACC_STATIC, ACC_VOLATILE 88 89 public static void main(java.lang.String[]); 90 descriptor: ([Ljava/lang/String;)V 91 flags: ACC_PUBLIC, ACC_STATIC 92 Code: 93 stack=2, locals=2, args_size=1 94 0: new #1 // class com/clouds/example/service/lock/LockExample 95 3: dup 96 4: invokespecial #2 // Method "<init>":()V 97 7: astore_1 98 8: aload_1 99 9: invokevirtual #3 // Method innerSynch:()V 100 12: return 101 LineNumberTable: 102 line 12: 0 103 line 13: 8 104 line 15: 12 105 106 public com.clouds.example.service.lock.LockExample(); 107 descriptor: ()V 108 flags: ACC_PUBLIC 109 Code: 110 stack=1, locals=1, args_size=1 111 0: aload_0 112 1: invokespecial #4 // Method java/lang/Object."<init>":()V 113 4: iconst_2 114 5: putstatic #5 // Field i:I 115 8: iconst_1 116 9: putstatic #6 // Field state:I 117 12: return 118 LineNumberTable: 119 line 17: 0 120 line 18: 4 121 line 19: 8 122 line 20: 12 123 124 public void innerSynch(); 125 descriptor: ()V 126 flags: ACC_PUBLIC 127 Code: 128 stack=2, locals=4, args_size=1 129 0: aload_0 130 1: dup 131 2: astore_1 132 3: monitorenter 133 4: getstatic #7 // Field java/lang/System.out:Ljava/io/PrintStream; 134 7: ldc #8 // String [ get inner lock ] success 135 9: invokevirtual #9 // Method java/io/PrintStream.println:(Ljava/lang/String;)V 136 12: getstatic #5 // Field i:I 137 15: iconst_1 138 16: iadd 139 17: putstatic #5 // Field i:I 140 20: getstatic #10 // Field j:I 141 23: iconst_1 142 24: iadd 143 25: putstatic #10 // Field j:I 144 28: getstatic #6 // Field state:I 145 31: iconst_1 146 32: iadd 147 33: putstatic #6 // Field state:I 148 36: getstatic #11 // Field k:I 149 39: iconst_1 150 40: iadd 151 41: putstatic #11 // Field k:I 152 44: aload_0 153 45: invokevirtual #12 // Method java/lang/Object.wait:()V 154 48: goto 52 155 51: astore_2 156 52: aload_0 157 53: invokevirtual #14 // Method java/lang/Object.notifyAll:()V 158 56: getstatic #7 // Field java/lang/System.out:Ljava/io/PrintStream; 159 59: ldc #15 // String [ notifyAll ] ... ... 160 61: invokevirtual #9 // Method java/io/PrintStream.println:(Ljava/lang/String;)V 161 64: aload_1 162 65: monitorexit 163 66: goto 74 164 69: astore_3 165 70: aload_1 166 71: monitorexit 167 72: aload_3 168 73: athrow 169 74: return 170 Exception table: 171 from to target type 172 44 48 51 Class java/lang/InterruptedException 173 4 66 69 any 174 69 72 69 any 175 LineNumberTable: 176 line 23: 0 177 line 24: 4 178 line 25: 12 179 line 26: 20 180 line 27: 28 181 line 28: 36 182 line 30: 44 183 line 33: 48 184 line 31: 51 185 line 34: 52 186 line 35: 56 187 line 36: 64 188 line 38: 74 189 StackMapTable: number_of_entries = 4 190 frame_type = 255 /* full_frame */ 191 offset_delta = 51 192 locals = [ class com/clouds/example/service/lock/LockExample, class java/lang/Object ] 193 stack = [ class java/lang/InterruptedException ] 194 frame_type = 0 /* same */ 195 frame_type = 80 /* same_locals_1_stack_item */ 196 stack = [ class java/lang/Throwable ] 197 frame_type = 250 /* chop */ 198 offset_delta = 4 199 } 200 SourceFile: "LockExample.java"
从上面的jvm指令中发现，volatile修饰的state只是比其它几个多了一个volatile关键字的标记，其它地地方的jvm指令一摸一样；
接下来再将它的汇编指令扒出来看看；
通过Class看汇编的方式：
第一步：需要 hsdis-amd64.dll 打印java的汇编文件（至于如何创建该文件，则以后再研究，由于我是再windows上操作，所以是dll文件，如果是linux则后缀应该是.so文件）
需要将hsdis-amd64.dll 放到JAVA_HOMEjreinserver目录下
第二步：基于Class文件执行如下命令，运行并打印执行的汇编指令：
C:UsersAdministratorDesktop> java -Xcomp /
-XX:+UnlockDiagnosticVMOptions /
-XX:+PrintAssembly /
-XX:CompileCommand=dontinline,LockExample.innerSynch /
-XX:CompileCommand=compileonly,LockExample.innerSynch /
LockExample > sync1
结果输入到文件：sync1
1 CompilerOracle: dontinline LockExample.innerSynch 2 CompilerOracle: compileonly LockExample.innerSynch 3 Loaded disassembler from hsdis-amd64.dll 4 Decoding compiled method 0x0000000003324910: 5 Code: 6 [Disassembling for mach='i386:x86-64'] 7 [Entry Point] 8 [Constants] 9 # {method} {0x0000000017b40490} 'innerSynch' '()V' in 'LockExample' 10 # [sp+0x50] (sp of caller) 11 0x0000000003324ac0: mov 0x8(%rdx),%r10d 12 0x0000000003324ac4: shl $0x3,%r10 13 0x0000000003324ac8: cmp %rax,%r10 14 0x0000000003324acb: jne 0x0000000003265f60 ; {runtime_call} 15 0x0000000003324ad1: data16 data16 nopw 0x0(%rax,%rax,1) 16 0x0000000003324adc: data16 data16 xchg %ax,%ax 17 [Verified Entry Point] 18 0x0000000003324ae0: mov %eax,-0x6000(%rsp) 19 0x0000000003324ae7: push %rbp 20 0x0000000003324ae8: sub $0x40,%rsp 21 0x0000000003324aec: movabs $0x17b406a8,%rax ; {metadata(method data for {method} {0x0000000017b40490} 'innerSynch' '()V' in 'LockExample')} 22 0x0000000003324af6: mov 0xdc(%rax),%r8d 23 0x0000000003324afd: add $0x8,%r8d 24 0x0000000003324b01: mov %r8d,0xdc(%rax) 25 0x0000000003324b08: movabs $0x17b40488,%rax ; {metadata({method} {0x0000000017b40490} 'innerSynch' '()V' in 'LockExample')} 26 0x0000000003324b12: and $0x0,%r8d 27 0x0000000003324b16: cmp $0x0,%r8d 28 0x0000000003324b1a: je 0x0000000003324e60 ;*aload_0 29 ; - LockExample::innerSynch@0 (line 23) 30 31 0x0000000003324b20: lea 0x28(%rsp),%r8 32 0x0000000003324b25: mov %rdx,0x8(%r8) 33 0x0000000003324b29: mov (%rdx),%rax 34 0x0000000003324b2c: mov %rax,%rsi 35 0x0000000003324b2f: and $0x7,%rsi 36 0x0000000003324b33: cmp $0x5,%rsi 37 0x0000000003324b37: jne 0x0000000003324bbe 38 0x0000000003324b3d: mov 0x8(%rdx),%esi 39 0x0000000003324b40: shl $0x3,%rsi 40 0x0000000003324b44: mov 0xa8(%rsi),%rsi 41 0x0000000003324b4b: or %r15,%rsi 42 0x0000000003324b4e: xor %rax,%rsi 43 0x0000000003324b51: and $0xffffffffffffff87,%rsi 44 0x0000000003324b55: je 0x0000000003324be6 45 0x0000000003324b5b: test $0x7,%rsi 46 0x0000000003324b62: jne 0x0000000003324bab 47 0x0000000003324b64: test $0x300,%rsi 48 0x0000000003324b6b: jne 0x0000000003324b8a 49 0x0000000003324b6d: and $0x37f,%rax 50 0x0000000003324b74: mov %rax,%rsi 51 0x0000000003324b77: or %r15,%rsi 52 0x0000000003324b7a: lock cmpxchg %rsi,(%rdx) 53 0x0000000003324b7f: jne 0x0000000003324e77 54 0x0000000003324b85: jmpq 0x0000000003324be6 55 0x0000000003324b8a: mov 0x8(%rdx),%esi 56 0x0000000003324b8d: shl $0x3,%rsi 57 0x0000000003324b91: mov 0xa8(%rsi),%rsi 58 0x0000000003324b98: or %r15,%rsi 59 0x0000000003324b9b: lock cmpxchg %rsi,(%rdx) 60 0x0000000003324ba0: jne 0x0000000003324e77 61 0x0000000003324ba6: jmpq 0x0000000003324be6 62 0x0000000003324bab: mov 0x8(%rdx),%esi 63 0x0000000003324bae: shl $0x3,%rsi 64 0x0000000003324bb2: mov 0xa8(%rsi),%rsi 65 0x0000000003324bb9: lock cmpxchg %rsi,(%rdx) 66 0x0000000003324bbe: mov (%rdx),%rax 67 0x0000000003324bc1: or $0x1,%rax 68 0x0000000003324bc5: mov %rax,(%r8) 69 0x0000000003324bc8: lock cmpxchg %r8,(%rdx) 70 0x0000000003324bcd: je 0x0000000003324be6 71 0x0000000003324bd3: sub %rsp,%rax 72 0x0000000003324bd6: and $0xfffffffffffff007,%rax 73 0x0000000003324bdd: mov %rax,(%r8) 74 0x0000000003324be0: jne 0x0000000003324e77 ;*monitorenter 75 ; - LockExample::innerSynch@3 (line 23) 76 77 0x0000000003324be6: mov %rdx,0x20(%rsp) 78 0x0000000003324beb: nopl 0x0(%rax,%rax,1) 79 0x0000000003324bf0: jmpq 0x0000000003324ee7 ; {no_reloc} 80 0x0000000003324bf5: add %al,(%rax) 81 0x0000000003324bf7: add %al,(%rax) 82 0x0000000003324bf9: add %ah,0xf(%rsi) 83 0x0000000003324bfc: (bad) 84 0x0000000003324bfd: add %r8b,(%rax) 85 0x0000000003324c00: jmpq 0x0000000003324f02 ; implicit exception: dispatches to 0x0000000003324ef1 86 0x0000000003324c05: nop 87 0x0000000003324c06: nop ;*getstatic out 88 ; - LockExample::innerSynch@4 (line 24) 89 90 0x0000000003324c07: cmp (%rsi),%rax ; implicit exception: dispatches to 0x0000000003324f0c 91 0x0000000003324c0a: mov %rsi,%r8 92 0x0000000003324c0d: movabs $0x17b406a8,%rdi ; {metadata(method data for {method} {0x0000000017b40490} 'innerSynch' '()V' in 'LockExample')} 93 0x0000000003324c17: mov 0x8(%r8),%r8d 94 0x0000000003324c1b: shl $0x3,%r8 95 0x0000000003324c1f: cmp 0x110(%rdi),%r8 96 0x0000000003324c26: jne 0x0000000003324c35 97 0x0000000003324c28: addq $0x1,0x118(%rdi) 98 0x0000000003324c30: jmpq 0x0000000003324c9b 99 0x0000000003324c35: cmp 0x120(%rdi),%r8 100 0x0000000003324c3c: jne 0x0000000003324c4b 101 0x0000000003324c3e: addq $0x1,0x128(%rdi) 102 0x0000000003324c46: jmpq 0x0000000003324c9b 103 0x0000000003324c4b: cmpq $0x0,0x110(%rdi) 104 0x0000000003324c56: jne 0x0000000003324c6f 105 0x0000000003324c58: mov %r8,0x110(%rdi) 106 0x0000000003324c5f: movq $0x1,0x118(%rdi) 107 0x0000000003324c6a: jmpq 0x0000000003324c9b 108 0x0000000003324c6f: cmpq $0x0,0x120(%rdi) 109 0x0000000003324c7a: jne 0x0000000003324c93 110 0x0000000003324c7c: mov %r8,0x120(%rdi) 111 0x0000000003324c83: movq $0x1,0x128(%rdi) 112 0x0000000003324c8e: jmpq 0x0000000003324c9b 113 0x0000000003324c93: addq $0x1,0x108(%rdi) 114 0x0000000003324c9b: movabs $0xd62c7b68,%r8 ; {oop("[ get inner lock ] success")} 115 0x0000000003324ca5: mov %rsi,%rdx ;*invokevirtual println 116 ; - LockExample::innerSynch@9 (line 24) 117 118 0x0000000003324ca8: nop 119 0x0000000003324ca9: nop 120 0x0000000003324caa: nop 121 0x0000000003324cab: nop 122 0x0000000003324cac: nop 123 0x0000000003324cad: movabs $0xffffffffffffffff,%rax 124 0x0000000003324cb7: callq 0x00000000032663e0 ; OopMap{[32]=Oop [48]=Oop off=508} 125 ;*invokevirtual println 126 ; - LockExample::innerSynch@9 (line 24) 127 ; {virtual_call} 128 0x0000000003324cbc: movabs $0xd6254880,%r8 ; {oop(a 'java/lang/Class' = 'LockExample')} 129 0x0000000003324cc6: mov 0x68(%r8),%edx ;*getstatic i 130 ; - LockExample::innerSynch@12 (line 25) 131 132 0x0000000003324cca: inc %edx 133 0x0000000003324ccc: mov %edx,0x68(%r8) ;*putstatic i 134 ; - LockExample::innerSynch@17 (line 25) 135 136 0x0000000003324cd0: mov 0x6c(%r8),%edx ;*getstatic j 137 ; - LockExample::innerSynch@20 (line 26) 138 139 0x0000000003324cd4: inc %edx 140 0x0000000003324cd6: mov %edx,0x6c(%r8) ;*putstatic j 141 ; - LockExample::innerSynch@25 (line 26) 142 143 0x0000000003324cda: mov 0x74(%r8),%edx ;*getstatic state 144 ; - LockExample::innerSynch@28 (line 27) 145 146 0x0000000003324cde: inc %edx 147 0x0000000003324ce0: mov %edx,0x74(%r8) 148 0x0000000003324ce4: lock addl $0x0,(%rsp) ;*putstatic state 149 ; - LockExample::innerSynch@33 (line 27) 150 151 0x0000000003324ce9: mov 0x70(%r8),%edx ;*getstatic k 152 ; - LockExample::innerSynch@36 (line 28) 153 154 0x0000000003324ced: inc %edx 155 0x0000000003324cef: mov %edx,0x70(%r8) ;*putstatic k 156 ; - LockExample::innerSynch@41 (line 28) 157 158 0x0000000003324cf3: nopl 0x0(%rax,%rax,1) 159 0x0000000003324cf8: jmpq 0x0000000003324f6e ; {no_reloc} 160 0x0000000003324cfd: add %al,(%rax) 161 0x0000000003324cff: add %al,(%rax) 162 0x0000000003324d01: add %ah,0xf(%rsi) 163 0x0000000003324d04: (bad) 164 0x0000000003324d05: add %r8b,(%rax) 165 0x0000000003324d08: jmpq 0x0000000003324f89 ; implicit exception: dispatches to 0x0000000003324f78 166 0x0000000003324d0d: nop 167 0x0000000003324d0e: nop ;*getstatic out 168 ; - LockExample::innerSynch@44 (line 29) 169 170 0x0000000003324d0f: cmp (%rdx),%rax ; implicit exception: dispatches to 0x0000000003324f93 171 0x0000000003324d12: mov %rdx,%r8 172 0x0000000003324d15: movabs $0x17b406a8,%rsi ; {metadata(method data for {method} {0x0000000017b40490} 'innerSynch' '()V' in 'LockExample')} 173 0x0000000003324d1f: mov 0x8(%r8),%r8d 174 0x0000000003324d23: shl $0x3,%r8 175 0x0000000003324d27: cmp 0x140(%rsi),%r8 176 0x0000000003324d2e: jne 0x0000000003324d3d 177 0x0000000003324d30: addq $0x1,0x148(%rsi) 178 0x0000000003324d38: jmpq 0x0000000003324da3 179 0x0000000003324d3d: cmp 0x150(%rsi),%r8 180 0x0000000003324d44: jne 0x0000000003324d53 181 0x0000000003324d46: addq $0x1,0x158(%rsi) 182 0x0000000003324d4e: jmpq 0x0000000003324da3 183 0x0000000003324d53: cmpq $0x0,0x140(%rsi) 184 0x0000000003324d5e: jne 0x0000000003324d77 185 0x0000000003324d60: mov %r8,0x140(%rsi) 186 0x0000000003324d67: movq $0x1,0x148(%rsi) 187 0x0000000003324d72: jmpq 0x0000000003324da3 188 0x0000000003324d77: cmpq $0x0,0x150(%rsi) 189 0x0000000003324d82: jne 0x0000000003324d9b 190 0x0000000003324d84: mov %r8,0x150(%rsi) 191 0x0000000003324d8b: movq $0x1,0x158(%rsi) 192 0x0000000003324d96: jmpq 0x0000000003324da3 193 0x0000000003324d9b: addq $0x1,0x138(%rsi) 194 0x0000000003324da3: movabs $0xd62c7bc8,%r8 ;*invokevirtual println 195 ; - LockExample::innerSynch@49 (line 29) 196 ; {oop("[ notifyAll ] ... ...")} 197 0x0000000003324dad: movabs $0xffffffffffffffff,%rax 198 0x0000000003324db7: callq 0x00000000032663e0 ; OopMap{[32]=Oop [48]=Oop off=764} 199 ;*invokevirtual println 200 ; - LockExample::innerSynch@49 (line 29) 201 ; {virtual_call} 202 0x0000000003324dbc: lea 0x28(%rsp),%rax 203 0x0000000003324dc1: mov 0x8(%rax),%rdi 204 0x0000000003324dc5: mov (%rdi),%rsi 205 0x0000000003324dc8: and $0x7,%rsi 206 0x0000000003324dcc: cmp $0x5,%rsi 207 0x0000000003324dd0: je 0x0000000003324ded 208 0x0000000003324dd6: mov (%rax),%rsi 209 0x0000000003324dd9: test %rsi,%rsi 210 0x0000000003324ddc: je 0x0000000003324ded 211 0x0000000003324de2: lock cmpxchg %rsi,(%rdi) 212 0x0000000003324de7: jne 0x0000000003324f98 ;*monitorexit 213 ; - LockExample::innerSynch@53 (line 30) 214 215 0x0000000003324ded: movabs $0x17b406a8,%rax ; {metadata(method data for {method} {0x0000000017b40490} 'innerSynch' '()V' in 'LockExample')} 216 0x0000000003324df7: incl 0x168(%rax) ;*goto 217 ; - LockExample::innerSynch@54 (line 30) 218 219 0x0000000003324dfd: add $0x40,%rsp 220 0x0000000003324e01: pop %rbp 221 0x0000000003324e02: test %eax,-0x2734d08(%rip) # 0x0000000000bf0100 222 ; {poll_return} 223 0x0000000003324e08: retq ;*return 224 ; - LockExample::innerSynch@62 (line 32) 225 226 0x0000000003324e09: mov 0x2a8(%r15),%rax 227 0x0000000003324e10: xor %r10,%r10 228 0x0000000003324e13: mov %r10,0x2a8(%r15) 229 0x0000000003324e1a: xor %r10,%r10 230 0x0000000003324e1d: mov %r10,0x2b0(%r15) 231 0x0000000003324e24: mov %rax,%rsi 232 0x0000000003324e27: lea 0x28(%rsp),%rax 233 0x0000000003324e2c: mov 0x8(%rax),%rbx 234 0x0000000003324e30: mov (%rbx),%rdi 235 0x0000000003324e33: and $0x7,%rdi 236 0x0000000003324e37: cmp $0x5,%rdi 237 0x0000000003324e3b: je 0x0000000003324e58 238 0x0000000003324e41: mov (%rax),%rdi 239 0x0000000003324e44: test %rdi,%rdi 240 0x0000000003324e47: je 0x0000000003324e58 241 0x0000000003324e4d: lock cmpxchg %rdi,(%rbx) 242 0x0000000003324e52: jne 0x0000000003324fab ;*monitorexit 243 ; - LockExample::innerSynch@59 (line 30) 244 245 0x0000000003324e58: mov %rsi,%rax 246 0x0000000003324e5b: jmpq 0x0000000003324fe9 247 0x0000000003324e60: mov %rax,0x8(%rsp) 248 0x0000000003324e65: movq $0xffffffffffffffff,(%rsp) 249 0x0000000003324e6d: callq 0x0000000003320b20 ; OopMap{rdx=Oop off=946} 250 ;*synchronization entry 251 ; - LockExample::innerSynch@-1 (line 23) 252 ; {runtime_call} 253 0x0000000003324e72: jmpq 0x0000000003324b20 254 0x0000000003324e77: mov %rdx,0x8(%rsp) 255 0x0000000003324e7c: mov %r8,(%rsp) 256 0x0000000003324e80: callq 0x000000000331ec20 ; OopMap{rdx=Oop [48]=Oop off=965} 257 ;*monitorenter 258 ; - LockExample::innerSynch@3 (line 23) 259 ; {runtime_call} 260 0x0000000003324e85: jmpq 0x0000000003324be6 261 0x0000000003324e8a: movabs $0x0,%r8 ; {oop(NULL)} 262 0x0000000003324e94: push %rax 263 0x0000000003324e95: push %rbx 264 0x0000000003324e96: mov 0x48(%r8),%rbx 265 0x0000000003324e9a: push %rdi 266 0x0000000003324e9b: push %rsi 267 0x0000000003324e9c: push %rdx 268 0x0000000003324e9d: push %rcx 269 0x0000000003324e9e: push %r8 270 0x0000000003324ea0: push %r9 271 0x0000000003324ea2: push %r10 272 0x0000000003324ea4: mov %rsp,%r10 273 0x0000000003324ea7: and $0xfffffffffffffff0,%rsp 274 0x0000000003324eab: push %r10 275 0x0000000003324ead: push %r11 276 0x0000000003324eaf: mov $0x7,%ecx 277 0x0000000003324eb4: movabs $0x7ff816c75250,%r10 ; {runtime_call} 278 0x0000000003324ebe: callq *%r10 279 0x0000000003324ec1: pop %r11 280 0x0000000003324ec3: pop %rsp 281 0x0000000003324ec4: pop %r10 282 0x0000000003324ec6: pop %r9 283 0x0000000003324ec8: pop %r8 284 0x0000000003324eca: pop %rcx 285 0x0000000003324ecb: pop %rdx 286 0x0000000003324ecc: pop %rsi 287 0x0000000003324ecd: pop %rdi 288 0x0000000003324ece: cmp 0x118(%rbx),%rax 289 0x0000000003324ed5: pop %rbx 290 0x0000000003324ed6: pop %rax 291 0x0000000003324ed7: jne 0x0000000003324ee7 292 0x0000000003324edd: jmpq 0x0000000003324bfa 293 0x0000000003324ee2: mov $0xa535d00,%eax 294 0x0000000003324ee7: callq 0x000000000331fd20 ; OopMap{[32]=Oop [48]=Oop off=1068} 295 ;*getstatic out 296 ; - LockExample::innerSynch@4 (line 24) 297 ; {runtime_call} 298 0x0000000003324eec: jmpq 0x0000000003324bf0 299 0x0000000003324ef1: callq 0x000000000331bf80 ; OopMap{[32]=Oop r8=Oop [48]=Oop off=1078} 300 ;*getstatic out 301 ; - LockExample::innerSynch@4 (line 24) 302 ; {runtime_call} 303 0x0000000003324ef6: mov 0x0(%r8),%esi 304 0x0000000003324efd: mov $0x7050c00,%eax 305 0x0000000003324f02: callq 0x000000000331f4a0 ; OopMap{[32]=Oop r8=Oop [48]=Oop off=1095} 306 ;*getstatic out 307 ; - LockExample::innerSynch@4 (line 24) 308 ; {runtime_call} 309 0x0000000003324f07: jmpq 0x0000000003324c00 310 0x0000000003324f0c: callq 0x000000000331bf80 ; OopMap{[32]=Oop rsi=Oop [48]=Oop off=1105} 311 ;*invokevirtual println 312 ; - LockExample::innerSynch@9 (line 24) 313 ; {runtime_call} 314 0x0000000003324f11: movabs $0x0,%r8 ; {oop(NULL)} 315 0x0000000003324f1b: push %rax 316 0x0000000003324f1c: push %rbx 317 0x0000000003324f1d: mov 0x48(%r8),%rbx 318 0x0000000003324f21: push %rdi 319 0x0000000003324f22: push %rsi 320 0x0000000003324f23: push %rdx 321 0x0000000003324f24: push %rcx 322 0x0000000003324f25: push %r8 323 0x0000000003324f27: push %r9 324 0x0000000003324f29: push %r10 325 0x0000000003324f2b: mov %rsp,%r10 326 0x0000000003324f2e: and $0xfffffffffffffff0,%rsp 327 0x0000000003324f32: push %r10 328 0x0000000003324f34: push %r11 329 0x0000000003324f36: mov $0x7,%ecx 330 0x0000000003324f3b: movabs $0x7ff816c75250,%r10 ; {runtime_call} 331 0x0000000003324f45: callq *%r10 332 0x0000000003324f48: pop %r11 333 0x0000000003324f4a: pop %rsp 334 0x0000000003324f4b: pop %r10 335 0x0000000003324f4d: pop %r9 336 0x0000000003324f4f: pop %r8 337 0x0000000003324f51: pop %rcx 338 0x0000000003324f52: pop %rdx 339 0x0000000003324f53: pop %rsi 340 0x0000000003324f54: pop %rdi 341 0x0000000003324f55: cmp 0x118(%rbx),%rax 342 0x0000000003324f5c: pop %rbx 343 0x0000000003324f5d: pop %rax 344 0x0000000003324f5e: jne 0x0000000003324f6e 345 0x0000000003324f64: jmpq 0x0000000003324d02 346 0x0000000003324f69: mov $0xa535d00,%eax 347 0x0000000003324f6e: callq 0x000000000331fd20 ; OopMap{[32]=Oop [48]=Oop off=1203} 348 ;*getstatic out 349 ; - LockExample::innerSynch@44 (line 29) 350 ; {runtime_call} 351 0x0000000003324f73: jmpq 0x0000000003324cf8 352 0x0000000003324f78: callq 0x000000000331bf80 ; OopMap{[32]=Oop r8=Oop [48]=Oop off=1213} 353 ;*getstatic out 354 ; - LockExample::innerSynch@44 (line 29) 355 ; {runtime_call} 356 0x0000000003324f7d: mov 0x0(%r8),%edx 357 0x0000000003324f84: mov $0x7050c00,%eax 358 0x0000000003324f89: callq 0x000000000331f4a0 ; OopMap{[32]=Oop r8=Oop [48]=Oop off=1230} 359 ;*getstatic out 360 ; - LockExample::innerSynch@44 (line 29) 361 ; {runtime_call} 362 0x0000000003324f8e: jmpq 0x0000000003324d08 363 0x0000000003324f93: callq 0x000000000331bf80 ; OopMap{[32]=Oop rdx=Oop [48]=Oop off=1240} 364 ;*invokevirtual println 365 ; - LockExample::innerSynch@49 (line 29) 366 ; {runtime_call} 367 0x0000000003324f98: lea 0x28(%rsp),%rax 368 0x0000000003324f9d: mov %rax,(%rsp) 369 0x0000000003324fa1: callq 0x000000000331f060 ; {runtime_call} 370 0x0000000003324fa6: jmpq 0x0000000003324ded 371 0x0000000003324fab: lea 0x28(%rsp),%rax 372 0x0000000003324fb0: mov %rax,(%rsp) 373 0x0000000003324fb4: callq 0x000000000331f060 ; {runtime_call} 374 0x0000000003324fb9: jmpq 0x0000000003324e58 375 0x0000000003324fbe: nop 376 0x0000000003324fbf: nop 377 0x0000000003324fc0: mov 0x2a8(%r15),%rax 378 0x0000000003324fc7: movabs $0x0,%r10 379 0x0000000003324fd1: mov %r10,0x2a8(%r15) 380 0x0000000003324fd8: movabs $0x0,%r10 381 0x0000000003324fe2: mov %r10,0x2b0(%r15) 382 0x0000000003324fe9: add $0x40,%rsp 383 0x0000000003324fed: pop %rbp 384 0x0000000003324fee: jmpq 0x000000000331b0a0 ; {runtime_call} 385 0x0000000003324ff3: hlt 386 0x0000000003324ff4: hlt 387 0x0000000003324ff5: hlt 388 0x0000000003324ff6: hlt 389 0x0000000003324ff7: hlt 390 0x0000000003324ff8: hlt 391 0x0000000003324ff9: hlt 392 0x0000000003324ffa: hlt 393 0x0000000003324ffb: hlt 394 0x0000000003324ffc: hlt 395 0x0000000003324ffd: hlt 396 0x0000000003324ffe: hlt 397 0x0000000003324fff: hlt 398 [Stub Code] 399 0x0000000003325000: nop ; {no_reloc} 400 0x0000000003325001: nop 401 0x0000000003325002: nop 402 0x0000000003325003: nop 403 0x0000000003325004: nop 404 0x0000000003325005: movabs $0x0,%rbx ; {static_stub} 405 0x000000000332500f: jmpq 0x000000000332500f ; {runtime_call} 406 0x0000000003325014: nop 407 0x0000000003325015: movabs $0x0,%rbx ; {static_stub} 408 0x000000000332501f: jmpq 0x000000000332501f ; {runtime_call} 409 [Exception Handler] 410 0x0000000003325024: callq 0x000000000331e0e0 ; {runtime_call} 411 0x0000000003325029: mov %rsp,-0x28(%rsp) 412 0x000000000332502e: sub $0x80,%rsp 413 0x0000000003325035: mov %rax,0x78(%rsp) 414 0x000000000332503a: mov %rcx,0x70(%rsp) 415 0x000000000332503f: mov %rdx,0x68(%rsp) 416 0x0000000003325044: mov %rbx,0x60(%rsp) 417 0x0000000003325049: mov %rbp,0x50(%rsp) 418 0x000000000332504e: mov %rsi,0x48(%rsp) 419 0x0000000003325053: mov %rdi,0x40(%rsp) 420 0x0000000003325058: mov %r8,0x38(%rsp) 421 0x000000000332505d: mov %r9,0x30(%rsp) 422 0x0000000003325062: mov %r10,0x28(%rsp) 423 0x0000000003325067: mov %r11,0x20(%rsp) 424 0x000000000332506c: mov %r12,0x18(%rsp) 425 0x0000000003325071: mov %r13,0x10(%rsp) 426 0x0000000003325076: mov %r14,0x8(%rsp) 427 0x000000000332507b: mov %r15,(%rsp) 428 0x000000000332507f: movabs $0x56491820,%rcx ; {external_word} 429 0x0000000003325089: movabs $0x3325029,%rdx ; {internal_word} 430 0x0000000003325093: mov %rsp,%r8 431 0x0000000003325096: and $0xfffffffffffffff0,%rsp 432 0x000000000332509a: callq 0x0000000056146f40 ; {runtime_call} 433 0x000000000332509f: hlt 434 [Deopt Handler Code] 435 0x00000000033250a0: movabs $0x33250a0,%r10 ; {section_word} 436 0x00000000033250aa: push %r10 437 0x00000000033250ac: jmpq 0x0000000003267600 ; {runtime_call} 438 0x00000000033250b1: hlt 439 0x00000000033250b2: hlt 440 0x00000000033250b3: hlt 441 0x00000000033250b4: hlt 442 0x00000000033250b5: hlt 443 0x00000000033250b6: hlt 444 0x00000000033250b7: hlt 445 Decoding compiled method 0x0000000003322b10: 446 Code: 447 [Entry Point] 448 [Constants] 449 # {method} {0x0000000017b40490} 'innerSynch' '()V' in 'LockExample' 450 # [sp+0x30] (sp of caller) 451 0x0000000003322c40: mov 0x8(%rdx),%r10d 452 0x0000000003322c44: shl $0x3,%r10 453 0x0000000003322c48: cmp %r10,%rax 454 0x0000000003322c4b: jne 0x0000000003265f60 ; {runtime_call} 455 0x0000000003322c51: data16 xchg %ax,%ax 456 0x0000000003322c54: nopl 0x0(%rax,%rax,1) 457 0x0000000003322c5c: data16 data16 xchg %ax,%ax 458 [Verified Entry Point] 459 0x0000000003322c60: mov %eax,-0x6000(%rsp) 460 0x0000000003322c67: push %rbp 461 0x0000000003322c68: sub $0x20,%rsp ;*synchronization entry 462 ; - LockExample::innerSynch@-1 (line 23) 463 464 0x0000000003322c6c: mov %rdx,%rbp 465 0x0000000003322c6f: mov (%rdx),%rax 466 0x0000000003322c72: mov %rax,%r10 467 0x0000000003322c75: and $0x7,%r10 468 0x0000000003322c79: cmp $0x5,%r10 469 0x0000000003322c7d: jne 0x0000000003322ce6 470 0x0000000003322c7f: mov $0x2000c005,%r11d ; {metadata('LockExample')} 471 0x0000000003322c85: movabs $0x0,%r10 472 0x0000000003322c8f: lea (%r10,%r11,8),%r10 473 0x0000000003322c93: mov 0xa8(%r10),%r10 474 0x0000000003322c9a: mov %r10,%r11 475 0x0000000003322c9d: or %r15,%r11 476 0x0000000003322ca0: mov %r11,%r8 477 0x0000000003322ca3: xor %rax,%r8 478 0x0000000003322ca6: test $0xffffffffffffff87,%r8 479 0x0000000003322cad: je 0x0000000003322cd5 480 0x0000000003322caf: test $0x7,%r8 481 0x0000000003322cb6: jne 0x0000000003322ce1 482 0x0000000003322cb8: test $0x300,%r8 483 0x0000000003322cbf: jne 0x0000000003322cce 484 0x0000000003322cc1: and $0x37f,%rax 485 0x0000000003322cc8: mov %rax,%r11 486 0x0000000003322ccb: or %r15,%r11 487 0x0000000003322cce: lock cmpxchg %r11,(%rdx) 488 0x0000000003322cd3: jne 0x0000000003322d35 ;*monitorenter 489 ; - LockExample::innerSynch@3 (line 23) 490 491 0x0000000003322cd5: mov $0x25,%edx 492 0x0000000003322cda: nop 493 0x0000000003322cdb: callq 0x00000000032657a0 ; OopMap{rbp=Oop off=160} 494 ;*getstatic out 495 ; - LockExample::innerSynch@4 (line 24) 496 ; {runtime_call} 497 0x0000000003322ce0: int3 ;*getstatic out 498 ; - LockExample::innerSynch@4 (line 24) 499 500 0x0000000003322ce1: lock cmpxchg %r10,(%rdx) 501 0x0000000003322ce6: lea 0x10(%rsp),%rbx 502 0x0000000003322ceb: mov (%rdx),%rax 503 0x0000000003322cee: test $0x2,%rax 504 0x0000000003322cf4: jne 0x0000000003322d1a 505 0x0000000003322cf6: or $0x1,%rax 506 0x0000000003322cfa: mov %rax,(%rbx) 507 0x0000000003322cfd: lock cmpxchg %rbx,(%rdx) 508 0x0000000003322d02: je 0x0000000003322d33 509 0x0000000003322d08: sub %rsp,%rax 510 0x0000000003322d0b: and $0xfffffffffffff007,%rax 511 0x0000000003322d12: mov %rax,(%rbx) 512 0x0000000003322d15: jmpq 0x0000000003322d33 513 0x0000000003322d1a: movq $0x3,(%rbx) 514 0x0000000003322d21: mov %rax,%rbx 515 0x0000000003322d24: mov 0x16(%rbx),%rax 516 0x0000000003322d28: test %rax,%rax 517 0x0000000003322d2b: jne 0x0000000003322d33 518 0x0000000003322d2d: lock cmpxchg %r15,0x16(%rbx) 519 0x0000000003322d33: je 0x0000000003322cd5 520 0x0000000003322d35: lea 0x10(%rsp),%r8 521 0x0000000003322d3a: nop 522 0x0000000003322d3b: callq 0x0000000003321860 ; OopMap{rbp=Oop off=256} 523 ;*monitorenter 524 ; - LockExample::innerSynch@3 (line 23) 525 ; {runtime_call} 526 0x0000000003322d40: jmp 0x0000000003322cd5 527 0x0000000003322d42: hlt 528 0x0000000003322d43: hlt 529 0x0000000003322d44: hlt 530 0x0000000003322d45: hlt 531 0x0000000003322d46: hlt 532 0x0000000003322d47: hlt 533 0x0000000003322d48: hlt 534 0x0000000003322d49: hlt 535 0x0000000003322d4a: hlt 536 0x0000000003322d4b: hlt 537 0x0000000003322d4c: hlt 538 0x0000000003322d4d: hlt 539 0x0000000003322d4e: hlt 540 0x0000000003322d4f: hlt 541 0x0000000003322d50: hlt 542 0x0000000003322d51: hlt 543 0x0000000003322d52: hlt 544 0x0000000003322d53: hlt 545 0x0000000003322d54: hlt 546 0x0000000003322d55: hlt 547 0x0000000003322d56: hlt 548 0x0000000003322d57: hlt 549 0x0000000003322d58: hlt 550 0x0000000003322d59: hlt 551 0x0000000003322d5a: hlt 552 0x0000000003322d5b: hlt 553 0x0000000003322d5c: hlt 554 0x0000000003322d5d: hlt 555 0x0000000003322d5e: hlt 556 0x0000000003322d5f: hlt 557 [Exception Handler] 558 [Stub Code] 559 0x0000000003322d60: jmpq 0x000000000328e020 ; {no_reloc} 560 [Deopt Handler Code] 561 0x0000000003322d65: callq 0x0000000003322d6a 562 0x0000000003322d6a: subq $0x5,(%rsp) 563 0x0000000003322d6f: jmpq 0x0000000003267600 ; {runtime_call} 564 0x0000000003322d74: hlt 565 0x0000000003322d75: hlt 566 0x0000000003322d76: hlt 567 0x0000000003322d77: hlt 568 [ get inner lock ] success 569 [ notifyAll ] ... ...
通过汇编指令发现如下内容：