Command: !U
!U [-gcinfo] [-ehinfo] <MethodDesc address> | <Code address>
Presents an annotated disassembly of a managed method when given a MethodDesc pointer for the method, or a code address within the method body. Unlike the debugger “U” function, the entire method from start to finish is printed, with annotations that convert metadata tokens to names.
If you pass the -gcinfo flag, you’ll get inline display of the GCInfo for the method. You can also obtain this information with the !GCInfo command. If you pass the -ehinfo flag, you’ll get inline display of exception info for the method. (Beginning and end of try/finally/catch handlers, etc.). You can also obtain this information with the !EHInfo command.
IsJitted: yes，means it has been compiled; and you can use !U to inspect the native code.
Example output:
!clrstack OS Thread Id: 0x36c (876) ESP EIP 0012f3c0 00ff019a IEnumerableTest.Utils.EnumToArray[[IEnumerableTest.Program+RoleType, LinqSelectTest]]() 0012f424 00ff00b9 IEnumerableTest.Program.Main(System.String[]) 0012f69c 79e71b4c [GCFrame: 0012f69c] !ip2md 00ff019a MethodDesc: 00933198 Method Name: IEnumerableTest.Utils.EnumToArray[[IEnumerableTest.Program+RoleType, LinqSelectTest]]() Class: 0093140c MethodTable: 0093313c mdToken: 06000001 Module: 00932c5c IsJitted: yes CodeAddr: 00ff0160 !u 00933198 Normal JIT generated code IEnumerableTest.Utils.EnumToArray[[IEnumerableTest.Program+RoleType, LinqSelectTest]]() Begin 00ff0160, size e3 00FF0160 55 push ebp 00FF0161 8BEC mov ebp,esp 00FF0163 57 push edi 00FF0164 56 push esi 00FF0165 53 push ebx 00FF0166 83EC50 sub esp,50h 00FF0169 8D7DC8 lea edi,[ebp-38h] 00FF016C B90B000000 mov ecx,0Bh 00FF0171 33C0 xor eax,eax 00FF0173 F3AB rep stos dword ptr es:[edi] 00FF0175 33C0 xor eax,eax 00FF0177 8945E4 mov dword ptr [ebp-1Ch],eax 00FF017A 833D142E930000 cmp dword ptr ds:[00932E14h],0 00FF0181 7405 je 00FF0188 00FF0183 E8C1A50D79 call 7A0CA749 (JitHelp: CORINFO_HELP_DBG_IS_JUST_MY_CODE) 00FF0188 33D2 xor edx,edx 00FF018A 8955C4 mov dword ptr [ebp-3Ch],edx 00FF018D 33D2 xor edx,edx 00FF018F 8955C0 mov dword ptr [ebp-40h],edx 00FF0192 C745BC00000000 mov dword ptr [ebp-44h],0 00FF0199 90 nop 00FF019A B96C309300 mov ecx,93306Ch (MT: IEnumerableTest.Program+RoleType) 00FF019F E816D9E878 call 79E7DABA (System.Type.GetTypeFromHandle(System.RuntimeTypeHandle), mdToken: 06000d56) 00FF01A4 8945B8 mov dword ptr [ebp-48h],eax 00FF01A7 8B45B8 mov eax,dword ptr [ebp-48h] 00FF01AA 8945C4 mov dword ptr [ebp-3Ch],eax 00FF01AD 8B4DC4 mov ecx,dword ptr [ebp-3Ch] 00FF01B0 8B01 mov eax,dword ptr [ecx] 00FF01B2 FF90C8000000 call dword ptr [eax+000000C8h] 00FF01B8 8945B4 mov dword ptr [ebp-4Ch],eax 00FF01BB B9E8063379 mov ecx,793306E8h (MT: System.Enum) 00FF01C0 E8F5D8E878 call 79E7DABA (System.Type.GetTypeFromHandle(System.RuntimeTypeHandle), mdToken: 06000d56) 00FF01C5 8945B0 mov dword ptr [ebp-50h],eax 00FF01C8 8B45B4 mov eax,dword ptr [ebp-4Ch] 00FF01CB 3B45B0 cmp eax,dword ptr [ebp-50h] 00FF01CE 0F94C0 sete al 00FF01D1 0FB6C0 movzx eax,al 00FF01D4 8945BC mov dword ptr [ebp-44h],eax 00FF01D7 837DBC00 cmp dword ptr [ebp-44h],0 00FF01DB 752F jne 00FF020C 00FF01DD 90 nop 00FF01DE B96C723179 mov ecx,7931726Ch (MT: System.ArgumentException) 00FF01E3 E8341E93FF call 0092201C (JitHelp: CORINFO_HELP_NEWSFAST) 00FF01E8 8945A4 mov dword ptr [ebp-5Ch],eax 00FF01EB BA5C2C9300 mov edx,932C5Ch 00FF01F0 B901000070 mov ecx,70000001h 00FF01F5 E80045FC78 call 79FB46FA (JitHelp: CORINFO_HELP_STRCNS) 00FF01FA 8BD0 mov edx,eax 00FF01FC 8B4DA4 mov ecx,dword ptr [ebp-5Ch] 00FF01FF E82C882B78 call 792A8A30 (System.ArgumentException..ctor(System.String), mdToken: 0600063b) 00FF0204 8B4DA4 mov ecx,dword ptr [ebp-5Ch] 00FF0207 E82346FC78 call 79FB482F (JitHelp: CORINFO_HELP_THROW) 00FF020C 8B4DC4 mov ecx,dword ptr [ebp-3Ch] 00FF020F E85C8A2878 call 79278C70 (System.Enum.GetValues(System.Type), mdToken: 0600010b) 00FF0214 8945AC mov dword ptr [ebp-54h],eax 00FF0217 8B55AC mov edx,dword ptr [ebp-54h] 00FF021A B99C419300 mov ecx,93419Ch (MT: System.Collections.Generic.IEnumerable`1[[IEnumerableTest.Program+RoleType, LinqSelectTest]]) 00FF021F E8CC2CE878 call 79E72EF0 (JitHelp: CORINFO_HELP_ISINSTANCEOFINTERFACE) 00FF0224 8BC8 mov ecx,eax 00FF0226 FF1518429300 call dword ptr ds:[00934218h] (System.Linq.Enumerable.ToArray[[IEnumerableTest.Program+RoleType, LinqSelectTest]](System.Collections.Generic.IEnumerable`1), mdToken: 06000574) 00FF022C 8945A8 mov dword ptr [ebp-58h],eax 00FF022F 8B45A8 mov eax,dword ptr [ebp-58h] 00FF0232 8945C0 mov dword ptr [ebp-40h],eax 00FF0235 90 nop 00FF0236 EB00 jmp 00FF0238 00FF0238 8B45C0 mov eax,dword ptr [ebp-40h] 00FF023B 8D65F4 lea esp,[ebp-0Ch] 00FF023E 5B pop ebx 00FF023F 5E pop esi 00FF0240 5F pop edi 00FF0241 5D pop ebp 00FF0242 C3 ret