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Diffstat (limited to 'ICSharpCode.Decompiler/FlowAnalysis/OpCodeInfo.cs')
| -rw-r--r-- | ICSharpCode.Decompiler/FlowAnalysis/OpCodeInfo.cs | 312 |
1 files changed, 312 insertions, 0 deletions
diff --git a/ICSharpCode.Decompiler/FlowAnalysis/OpCodeInfo.cs b/ICSharpCode.Decompiler/FlowAnalysis/OpCodeInfo.cs new file mode 100644 index 00000000..e0dc724f --- /dev/null +++ b/ICSharpCode.Decompiler/FlowAnalysis/OpCodeInfo.cs @@ -0,0 +1,312 @@ +// Copyright (c) 2011 AlphaSierraPapa for the SharpDevelop Team +// +// Permission is hereby granted, free of charge, to any person obtaining a copy of this +// software and associated documentation files (the "Software"), to deal in the Software +// without restriction, including without limitation the rights to use, copy, modify, merge, +// publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons +// to whom the Software is furnished to do so, subject to the following conditions: +// +// The above copyright notice and this permission notice shall be included in all copies or +// substantial portions of the Software. +// +// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, +// INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR +// PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE +// FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR +// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER +// DEALINGS IN THE SOFTWARE. + +using System; +using System.Collections.Generic; +using System.Linq; + +using Mono.Cecil.Cil; + +namespace ICSharpCode.Decompiler.FlowAnalysis +{ + /// <summary> + /// Additional info about opcodes. + /// </summary> + internal sealed class OpCodeInfo + { + public static bool IsUnconditionalBranch(OpCode opcode) + { + if (opcode.OpCodeType == OpCodeType.Prefix) + return false; + switch (opcode.FlowControl) { + case FlowControl.Branch: + case FlowControl.Throw: + case FlowControl.Return: + return true; + case FlowControl.Next: + case FlowControl.Call: + case FlowControl.Cond_Branch: + return false; + default: + throw new NotSupportedException(opcode.FlowControl.ToString()); + } + } + + static readonly OpCodeInfo[] knownOpCodes = { + #region Base Instructions + new OpCodeInfo(OpCodes.Add) { CanThrow = false }, + new OpCodeInfo(OpCodes.Add_Ovf) { CanThrow = true }, + new OpCodeInfo(OpCodes.Add_Ovf_Un) { CanThrow = true }, + new OpCodeInfo(OpCodes.And) { CanThrow = false }, + new OpCodeInfo(OpCodes.Arglist) { CanThrow = false }, + new OpCodeInfo(OpCodes.Beq) { CanThrow = false }, + new OpCodeInfo(OpCodes.Beq_S) { CanThrow = false }, + new OpCodeInfo(OpCodes.Bge) { CanThrow = false }, + new OpCodeInfo(OpCodes.Bge_S) { CanThrow = false }, + new OpCodeInfo(OpCodes.Bge_Un) { CanThrow = false }, + new OpCodeInfo(OpCodes.Bge_Un_S) { CanThrow = false }, + new OpCodeInfo(OpCodes.Bgt) { CanThrow = false }, + new OpCodeInfo(OpCodes.Bgt_S) { CanThrow = false }, + new OpCodeInfo(OpCodes.Bgt_Un) { CanThrow = false }, + new OpCodeInfo(OpCodes.Bgt_Un_S) { CanThrow = false }, + new OpCodeInfo(OpCodes.Ble) { CanThrow = false }, + new OpCodeInfo(OpCodes.Ble_S) { CanThrow = false }, + new OpCodeInfo(OpCodes.Ble_Un) { CanThrow = false }, + new OpCodeInfo(OpCodes.Ble_Un_S) { CanThrow = false }, + new OpCodeInfo(OpCodes.Blt) { CanThrow = false }, + new OpCodeInfo(OpCodes.Blt_S) { CanThrow = false }, + new OpCodeInfo(OpCodes.Blt_Un) { CanThrow = false }, + new OpCodeInfo(OpCodes.Blt_Un_S) { CanThrow = false }, + new OpCodeInfo(OpCodes.Bne_Un) { CanThrow = false }, + new OpCodeInfo(OpCodes.Bne_Un_S) { CanThrow = false }, + new OpCodeInfo(OpCodes.Br) { CanThrow = false }, + new OpCodeInfo(OpCodes.Br_S) { CanThrow = false }, + new OpCodeInfo(OpCodes.Break) { CanThrow = true }, + new OpCodeInfo(OpCodes.Brfalse) { CanThrow = false }, + new OpCodeInfo(OpCodes.Brfalse_S) { CanThrow = false }, + new OpCodeInfo(OpCodes.Brtrue) { CanThrow = false }, + new OpCodeInfo(OpCodes.Brtrue_S) { CanThrow = false }, + new OpCodeInfo(OpCodes.Call) { CanThrow = true }, + new OpCodeInfo(OpCodes.Calli) { CanThrow = true }, + new OpCodeInfo(OpCodes.Ceq) { CanThrow = false }, + new OpCodeInfo(OpCodes.Cgt) { CanThrow = false }, + new OpCodeInfo(OpCodes.Cgt_Un) { CanThrow = false }, + new OpCodeInfo(OpCodes.Ckfinite) { CanThrow = true }, + new OpCodeInfo(OpCodes.Clt) { CanThrow = false }, + new OpCodeInfo(OpCodes.Clt_Un) { CanThrow = false }, + // conv.<to type> + new OpCodeInfo(OpCodes.Conv_I1) { CanThrow = false }, + new OpCodeInfo(OpCodes.Conv_I2) { CanThrow = false }, + new OpCodeInfo(OpCodes.Conv_I4) { CanThrow = false }, + new OpCodeInfo(OpCodes.Conv_I8) { CanThrow = false }, + new OpCodeInfo(OpCodes.Conv_R4) { CanThrow = false }, + new OpCodeInfo(OpCodes.Conv_R8) { CanThrow = false }, + new OpCodeInfo(OpCodes.Conv_U1) { CanThrow = false }, + new OpCodeInfo(OpCodes.Conv_U2) { CanThrow = false }, + new OpCodeInfo(OpCodes.Conv_U4) { CanThrow = false }, + new OpCodeInfo(OpCodes.Conv_U8) { CanThrow = false }, + new OpCodeInfo(OpCodes.Conv_I) { CanThrow = false }, + new OpCodeInfo(OpCodes.Conv_U) { CanThrow = false }, + new OpCodeInfo(OpCodes.Conv_R_Un) { CanThrow = false }, + // conv.ovf.<to type> + new OpCodeInfo(OpCodes.Conv_Ovf_I1) { CanThrow = true}, + new OpCodeInfo(OpCodes.Conv_Ovf_I2) { CanThrow = true}, + new OpCodeInfo(OpCodes.Conv_Ovf_I4) { CanThrow = true}, + new OpCodeInfo(OpCodes.Conv_Ovf_I8) { CanThrow = true}, + new OpCodeInfo(OpCodes.Conv_Ovf_U1) { CanThrow = true}, + new OpCodeInfo(OpCodes.Conv_Ovf_U2) { CanThrow = true}, + new OpCodeInfo(OpCodes.Conv_Ovf_U4) { CanThrow = true}, + new OpCodeInfo(OpCodes.Conv_Ovf_U8) { CanThrow = true}, + new OpCodeInfo(OpCodes.Conv_Ovf_I) { CanThrow = true}, + new OpCodeInfo(OpCodes.Conv_Ovf_U) { CanThrow = true}, + // conv.ovf.<to type>.un + new OpCodeInfo(OpCodes.Conv_Ovf_I1_Un) { CanThrow = true }, + new OpCodeInfo(OpCodes.Conv_Ovf_I2_Un) { CanThrow = true }, + new OpCodeInfo(OpCodes.Conv_Ovf_I4_Un) { CanThrow = true }, + new OpCodeInfo(OpCodes.Conv_Ovf_I8_Un) { CanThrow = true }, + new OpCodeInfo(OpCodes.Conv_Ovf_U1_Un) { CanThrow = true }, + new OpCodeInfo(OpCodes.Conv_Ovf_U2_Un) { CanThrow = true }, + new OpCodeInfo(OpCodes.Conv_Ovf_U4_Un) { CanThrow = true }, + new OpCodeInfo(OpCodes.Conv_Ovf_U8_Un) { CanThrow = true }, + new OpCodeInfo(OpCodes.Conv_Ovf_I_Un) { CanThrow = true }, + new OpCodeInfo(OpCodes.Conv_Ovf_U_Un) { CanThrow = true }, + + //new OpCodeInfo(OpCodes.Cpblk) { CanThrow = true }, - no idea whether this might cause trouble for the type system, C# shouldn't use it so I'll disable it + new OpCodeInfo(OpCodes.Div) { CanThrow = true }, + new OpCodeInfo(OpCodes.Div_Un) { CanThrow = true }, + new OpCodeInfo(OpCodes.Dup) { CanThrow = true, IsMoveInstruction = true }, + new OpCodeInfo(OpCodes.Endfilter) { CanThrow = false }, + new OpCodeInfo(OpCodes.Endfinally) { CanThrow = false }, + //new OpCodeInfo(OpCodes.Initblk) { CanThrow = true }, - no idea whether this might cause trouble for the type system, C# shouldn't use it so I'll disable it + //new OpCodeInfo(OpCodes.Jmp) { CanThrow = true } - We don't support non-local control transfers. + new OpCodeInfo(OpCodes.Ldarg) { CanThrow = false, IsMoveInstruction = true }, + new OpCodeInfo(OpCodes.Ldarg_0) { CanThrow = false, IsMoveInstruction = true }, + new OpCodeInfo(OpCodes.Ldarg_1) { CanThrow = false, IsMoveInstruction = true }, + new OpCodeInfo(OpCodes.Ldarg_2) { CanThrow = false, IsMoveInstruction = true }, + new OpCodeInfo(OpCodes.Ldarg_3) { CanThrow = false, IsMoveInstruction = true }, + new OpCodeInfo(OpCodes.Ldarg_S) { CanThrow = false, IsMoveInstruction = true }, + new OpCodeInfo(OpCodes.Ldarga) { CanThrow = false }, + new OpCodeInfo(OpCodes.Ldarga_S) { CanThrow = false }, + new OpCodeInfo(OpCodes.Ldc_I4) { CanThrow = false }, + new OpCodeInfo(OpCodes.Ldc_I4_M1) { CanThrow = false }, + new OpCodeInfo(OpCodes.Ldc_I4_0) { CanThrow = false }, + new OpCodeInfo(OpCodes.Ldc_I4_1) { CanThrow = false }, + new OpCodeInfo(OpCodes.Ldc_I4_2) { CanThrow = false }, + new OpCodeInfo(OpCodes.Ldc_I4_3) { CanThrow = false }, + new OpCodeInfo(OpCodes.Ldc_I4_4) { CanThrow = false }, + new OpCodeInfo(OpCodes.Ldc_I4_5) { CanThrow = false }, + new OpCodeInfo(OpCodes.Ldc_I4_6) { CanThrow = false }, + new OpCodeInfo(OpCodes.Ldc_I4_7) { CanThrow = false }, + new OpCodeInfo(OpCodes.Ldc_I4_8) { CanThrow = false }, + new OpCodeInfo(OpCodes.Ldc_I4_S) { CanThrow = false }, + new OpCodeInfo(OpCodes.Ldc_I8) { CanThrow = false }, + new OpCodeInfo(OpCodes.Ldc_R4) { CanThrow = false }, + new OpCodeInfo(OpCodes.Ldc_R8) { CanThrow = false }, + new OpCodeInfo(OpCodes.Ldftn) { CanThrow = false }, + // ldind.<type> + new OpCodeInfo(OpCodes.Ldind_I1) { CanThrow = true }, + new OpCodeInfo(OpCodes.Ldind_I2) { CanThrow = true }, + new OpCodeInfo(OpCodes.Ldind_I4) { CanThrow = true }, + new OpCodeInfo(OpCodes.Ldind_I8) { CanThrow = true }, + new OpCodeInfo(OpCodes.Ldind_U1) { CanThrow = true }, + new OpCodeInfo(OpCodes.Ldind_U2) { CanThrow = true }, + new OpCodeInfo(OpCodes.Ldind_U4) { CanThrow = true }, + new OpCodeInfo(OpCodes.Ldind_R4) { CanThrow = true }, + new OpCodeInfo(OpCodes.Ldind_R8) { CanThrow = true }, + new OpCodeInfo(OpCodes.Ldind_I) { CanThrow = true }, + new OpCodeInfo(OpCodes.Ldind_Ref) { CanThrow = true }, + // the ldloc exceptions described in the spec can only occur on methods without .localsinit - but csc always sets that flag + new OpCodeInfo(OpCodes.Ldloc) { CanThrow = false, IsMoveInstruction = true }, + new OpCodeInfo(OpCodes.Ldloc_0) { CanThrow = false, IsMoveInstruction = true }, + new OpCodeInfo(OpCodes.Ldloc_1) { CanThrow = false, IsMoveInstruction = true }, + new OpCodeInfo(OpCodes.Ldloc_2) { CanThrow = false, IsMoveInstruction = true }, + new OpCodeInfo(OpCodes.Ldloc_3) { CanThrow = false, IsMoveInstruction = true }, + new OpCodeInfo(OpCodes.Ldloc_S) { CanThrow = false, IsMoveInstruction = true }, + new OpCodeInfo(OpCodes.Ldloca) { CanThrow = false }, + new OpCodeInfo(OpCodes.Ldloca_S) { CanThrow = false }, + new OpCodeInfo(OpCodes.Ldnull) { CanThrow = false }, + new OpCodeInfo(OpCodes.Leave) { CanThrow = false }, + new OpCodeInfo(OpCodes.Leave_S) { CanThrow = false }, + new OpCodeInfo(OpCodes.Localloc) { CanThrow = true }, + new OpCodeInfo(OpCodes.Mul) { CanThrow = false }, + new OpCodeInfo(OpCodes.Mul_Ovf) { CanThrow = true }, + new OpCodeInfo(OpCodes.Mul_Ovf_Un) { CanThrow = true }, + new OpCodeInfo(OpCodes.Neg) { CanThrow = false }, + new OpCodeInfo(OpCodes.Nop) { CanThrow = false }, + new OpCodeInfo(OpCodes.Not) { CanThrow = false }, + new OpCodeInfo(OpCodes.Or) { CanThrow = false }, + new OpCodeInfo(OpCodes.Pop) { CanThrow = false }, + new OpCodeInfo(OpCodes.Rem) { CanThrow = true }, + new OpCodeInfo(OpCodes.Rem_Un) { CanThrow = true }, + new OpCodeInfo(OpCodes.Ret) { CanThrow = false }, + new OpCodeInfo(OpCodes.Shl) { CanThrow = false }, + new OpCodeInfo(OpCodes.Shr) { CanThrow = false }, + new OpCodeInfo(OpCodes.Shr_Un) { CanThrow = false }, + new OpCodeInfo(OpCodes.Starg) { CanThrow = false, IsMoveInstruction = true }, + new OpCodeInfo(OpCodes.Starg_S) { CanThrow = false, IsMoveInstruction = true }, + new OpCodeInfo(OpCodes.Stind_I1) { CanThrow = true }, + new OpCodeInfo(OpCodes.Stind_I2) { CanThrow = true }, + new OpCodeInfo(OpCodes.Stind_I4) { CanThrow = true }, + new OpCodeInfo(OpCodes.Stind_I8) { CanThrow = true }, + new OpCodeInfo(OpCodes.Stind_R4) { CanThrow = true }, + new OpCodeInfo(OpCodes.Stind_R8) { CanThrow = true }, + new OpCodeInfo(OpCodes.Stind_I) { CanThrow = true }, + new OpCodeInfo(OpCodes.Stind_Ref) { CanThrow = true }, + new OpCodeInfo(OpCodes.Stloc) { CanThrow = false, IsMoveInstruction = true }, + new OpCodeInfo(OpCodes.Stloc_0) { CanThrow = false, IsMoveInstruction = true }, + new OpCodeInfo(OpCodes.Stloc_1) { CanThrow = false, IsMoveInstruction = true }, + new OpCodeInfo(OpCodes.Stloc_2) { CanThrow = false, IsMoveInstruction = true }, + new OpCodeInfo(OpCodes.Stloc_3) { CanThrow = false, IsMoveInstruction = true }, + new OpCodeInfo(OpCodes.Stloc_S) { CanThrow = false, IsMoveInstruction = true }, + new OpCodeInfo(OpCodes.Sub) { CanThrow = false }, + new OpCodeInfo(OpCodes.Sub_Ovf) { CanThrow = true }, + new OpCodeInfo(OpCodes.Sub_Ovf_Un) { CanThrow = true }, + new OpCodeInfo(OpCodes.Switch) { CanThrow = false }, + new OpCodeInfo(OpCodes.Xor) { CanThrow = false }, + #endregion + #region Object model instructions + // CanThrow is true by default - most OO instructions can throw, so we don't specify CanThrow all of the time + new OpCodeInfo(OpCodes.Box), + new OpCodeInfo(OpCodes.Callvirt), + new OpCodeInfo(OpCodes.Castclass), + new OpCodeInfo(OpCodes.Cpobj), + new OpCodeInfo(OpCodes.Initobj) { CanThrow = false }, + new OpCodeInfo(OpCodes.Isinst) { CanThrow = false }, + new OpCodeInfo(OpCodes.Ldelem_Any), + // ldelem.<type> + new OpCodeInfo(OpCodes.Ldelem_I) , + new OpCodeInfo(OpCodes.Ldelem_I1), + new OpCodeInfo(OpCodes.Ldelem_I2), + new OpCodeInfo(OpCodes.Ldelem_I4), + new OpCodeInfo(OpCodes.Ldelem_I8), + new OpCodeInfo(OpCodes.Ldelem_R4), + new OpCodeInfo(OpCodes.Ldelem_R8), + new OpCodeInfo(OpCodes.Ldelem_Ref), + new OpCodeInfo(OpCodes.Ldelem_U1), + new OpCodeInfo(OpCodes.Ldelem_U2), + new OpCodeInfo(OpCodes.Ldelem_U4), + new OpCodeInfo(OpCodes.Ldelema) , + new OpCodeInfo(OpCodes.Ldfld) , + new OpCodeInfo(OpCodes.Ldflda), + new OpCodeInfo(OpCodes.Ldlen) , + new OpCodeInfo(OpCodes.Ldobj) , + new OpCodeInfo(OpCodes.Ldsfld), + new OpCodeInfo(OpCodes.Ldsflda), + new OpCodeInfo(OpCodes.Ldstr) { CanThrow = false }, + new OpCodeInfo(OpCodes.Ldtoken) { CanThrow = false }, + new OpCodeInfo(OpCodes.Ldvirtftn), + new OpCodeInfo(OpCodes.Mkrefany), + new OpCodeInfo(OpCodes.Newarr), + new OpCodeInfo(OpCodes.Newobj), + new OpCodeInfo(OpCodes.Refanytype) { CanThrow = false }, + new OpCodeInfo(OpCodes.Refanyval), + new OpCodeInfo(OpCodes.Rethrow), + new OpCodeInfo(OpCodes.Sizeof) { CanThrow = false }, + new OpCodeInfo(OpCodes.Stelem_Any), + new OpCodeInfo(OpCodes.Stelem_I1), + new OpCodeInfo(OpCodes.Stelem_I2), + new OpCodeInfo(OpCodes.Stelem_I4), + new OpCodeInfo(OpCodes.Stelem_I8), + new OpCodeInfo(OpCodes.Stelem_R4), + new OpCodeInfo(OpCodes.Stelem_R8), + new OpCodeInfo(OpCodes.Stelem_Ref), + new OpCodeInfo(OpCodes.Stfld), + new OpCodeInfo(OpCodes.Stobj), + new OpCodeInfo(OpCodes.Stsfld), + new OpCodeInfo(OpCodes.Throw), + new OpCodeInfo(OpCodes.Unbox), + new OpCodeInfo(OpCodes.Unbox_Any), + #endregion + }; + static readonly Dictionary<Code, OpCodeInfo> knownOpCodeDict = knownOpCodes.ToDictionary(info => info.OpCode.Code); + + public static OpCodeInfo Get(OpCode opCode) + { + return Get(opCode.Code); + } + + public static OpCodeInfo Get(Code code) + { + OpCodeInfo info; + if (knownOpCodeDict.TryGetValue(code, out info)) + return info; + else + throw new NotSupportedException(code.ToString()); + } + + OpCode opcode; + + OpCodeInfo(OpCode opcode) + { + this.opcode = opcode; + CanThrow = true; + } + + public OpCode OpCode { get { return opcode; } } + + /// <summary> + /// 'Move' kind of instructions have one input (may be stack or local variable) and copy that value to all outputs (again stack or local variable). + /// </summary> + public bool IsMoveInstruction { get; private set; } + + /// <summary> + /// Specifies whether this opcode is capable of throwing exceptions. + /// </summary> + public bool CanThrow { get; private set; } + } +} |