C# MemoryReader.ReadOpcode方法代码示例

 static int CountCilInstructions(MemoryReader memReader) {
   int count = 0;
   while (memReader.NotEndOfBytes) {
     count++;
     OperationCode cilOpCode = memReader.ReadOpcode();
     switch (cilOpCode) {
       case OperationCode.Ldarg_S:
       case OperationCode.Ldarga_S:
       case OperationCode.Starg_S:
       case OperationCode.Ldloc_S:
       case OperationCode.Ldloca_S:
       case OperationCode.Stloc_S:
       case OperationCode.Ldc_I4_S:
       case OperationCode.Br_S:
       case OperationCode.Brfalse_S:
       case OperationCode.Brtrue_S:
       case OperationCode.Beq_S:
       case OperationCode.Bge_S:
       case OperationCode.Bgt_S:
       case OperationCode.Ble_S:
       case OperationCode.Blt_S:
       case OperationCode.Bne_Un_S:
       case OperationCode.Bge_Un_S:
       case OperationCode.Bgt_Un_S:
       case OperationCode.Ble_Un_S:
       case OperationCode.Blt_Un_S:
       case OperationCode.Leave_S:
       case OperationCode.Unaligned_:
       case OperationCode.No_:
         memReader.SkipBytes(1);
         break;
       case OperationCode.Ldarg:
       case OperationCode.Ldarga:
       case OperationCode.Starg:
       case OperationCode.Ldloc:
       case OperationCode.Ldloca:
       case OperationCode.Stloc:
         memReader.SkipBytes(2);
         break;
       case OperationCode.Ldc_I4:
       case OperationCode.Jmp:
       case OperationCode.Call:
       case OperationCode.Calli:
       case OperationCode.Br:
       case OperationCode.Brfalse:
       case OperationCode.Brtrue:
       case OperationCode.Beq:
       case OperationCode.Bge:
       case OperationCode.Bgt:
       case OperationCode.Ble:
       case OperationCode.Blt:
       case OperationCode.Bne_Un:
       case OperationCode.Bge_Un:
       case OperationCode.Bgt_Un:
       case OperationCode.Ble_Un:
       case OperationCode.Blt_Un:
       case OperationCode.Callvirt:
       case OperationCode.Cpobj:
       case OperationCode.Ldobj:
       case OperationCode.Ldstr:
       case OperationCode.Newobj:
       case OperationCode.Castclass:
       case OperationCode.Isinst:
       case OperationCode.Unbox:
       case OperationCode.Ldfld:
       case OperationCode.Ldflda:
       case OperationCode.Stfld:
       case OperationCode.Ldsfld:
       case OperationCode.Ldsflda:
       case OperationCode.Stsfld:
       case OperationCode.Stobj:
       case OperationCode.Box:
       case OperationCode.Newarr:
       case OperationCode.Ldelema:
       case OperationCode.Ldelem:
       case OperationCode.Stelem:
       case OperationCode.Unbox_Any:
       case OperationCode.Refanyval:
       case OperationCode.Mkrefany:
       case OperationCode.Ldtoken:
       case OperationCode.Leave:
       case OperationCode.Ldftn:
       case OperationCode.Ldvirtftn:
       case OperationCode.Initobj:
       case OperationCode.Constrained_:
       case OperationCode.Sizeof:
       case OperationCode.Ldc_R4:
         memReader.SkipBytes(4);
         break;
       case OperationCode.Ldc_I8:
       case OperationCode.Ldc_R8:
         memReader.SkipBytes(8);
         break;
       case OperationCode.Switch:
         int numTargets = (int)memReader.ReadUInt32();
         memReader.SkipBytes(4*numTargets);
         break;
       default:
         break;
     }
//.........这里部分代码省略.........

 bool PopulateCilInstructions() {
   MethodBodyDocument document = new MethodBodyDocument(this.MethodDefinition);
   MemoryReader memReader = new MemoryReader(this.MethodIL.EncodedILMemoryBlock);
   var numInstructions = CountCilInstructions(memReader);
   if (numInstructions == 0) return true;
   CilInstruction[] instrList = new CilInstruction[numInstructions];
   int instructionNumber = 0;
   while (memReader.NotEndOfBytes) {
     object/*?*/ value = null;
     uint offset = (uint)memReader.Offset;
     OperationCode cilOpCode = memReader.ReadOpcode();
     switch (cilOpCode) {
       case OperationCode.Nop:
       case OperationCode.Break:
         break;
       case OperationCode.Ldarg_0:
       case OperationCode.Ldarg_1:
       case OperationCode.Ldarg_2:
       case OperationCode.Ldarg_3:
         value = this.GetParameter((uint)(cilOpCode - OperationCode.Ldarg_0));
         break;
       case OperationCode.Ldloc_0:
       case OperationCode.Ldloc_1:
       case OperationCode.Ldloc_2:
       case OperationCode.Ldloc_3:
         value = this.GetLocal((uint)(cilOpCode - OperationCode.Ldloc_0));
         break;
       case OperationCode.Stloc_0:
       case OperationCode.Stloc_1:
       case OperationCode.Stloc_2:
       case OperationCode.Stloc_3:
         value = this.GetLocal((uint)(cilOpCode - OperationCode.Stloc_0));
         break;
       case OperationCode.Ldarg_S:
       case OperationCode.Ldarga_S:
       case OperationCode.Starg_S:
         value = this.GetParameter(memReader.ReadByte());
         break;
       case OperationCode.Ldloc_S:
       case OperationCode.Ldloca_S:
       case OperationCode.Stloc_S:
         value = this.GetLocal(memReader.ReadByte());
         break;
       case OperationCode.Ldnull:
       case OperationCode.Ldc_I4_M1:
       case OperationCode.Ldc_I4_0:
       case OperationCode.Ldc_I4_1:
       case OperationCode.Ldc_I4_2:
       case OperationCode.Ldc_I4_3:
       case OperationCode.Ldc_I4_4:
       case OperationCode.Ldc_I4_5:
       case OperationCode.Ldc_I4_6:
       case OperationCode.Ldc_I4_7:
       case OperationCode.Ldc_I4_8:
         break;
       case OperationCode.Ldc_I4_S:
         value = (int)memReader.ReadSByte();
         break;
       case OperationCode.Ldc_I4:
         value = memReader.ReadInt32();
         break;
       case OperationCode.Ldc_I8:
         value = memReader.ReadInt64();
         break;
       case OperationCode.Ldc_R4:
         value = memReader.ReadSingle();
         break;
       case OperationCode.Ldc_R8:
         value = memReader.ReadDouble();
         break;
       case OperationCode.Dup:
       case OperationCode.Pop:
         break;
       case OperationCode.Jmp:
         value = this.GetMethod(memReader.ReadUInt32());
         break;
       case OperationCode.Call: {
           IMethodReference methodReference = this.GetMethod(memReader.ReadUInt32());
           IArrayTypeReference/*?*/ arrayType = methodReference.ContainingType as IArrayTypeReference;
           if (arrayType != null) {
             // For Get(), Set() and Address() on arrays, the runtime provides method implementations.
             // Hence, CCI2 replaces these with pseudo instrcutions Array_Set, Array_Get and Array_Addr.
             // All other methods on arrays will not use pseudo instruction and will have methodReference as their operand. 
             if (methodReference.Name.UniqueKey == this.PEFileToObjectModel.NameTable.Set.UniqueKey) {
               cilOpCode = OperationCode.Array_Set;
               value = arrayType;
             } else if (methodReference.Name.UniqueKey == this.PEFileToObjectModel.NameTable.Get.UniqueKey) {
               cilOpCode = OperationCode.Array_Get;
               value = arrayType;
             } else if (methodReference.Name.UniqueKey == this.PEFileToObjectModel.NameTable.Address.UniqueKey) {
               cilOpCode = OperationCode.Array_Addr;
               value = arrayType;
             } else {
               value = methodReference;
             }
           } else {
             value = methodReference;
           }
         }
         break;
//.........这里部分代码省略.........