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May 30, 2017 13:52
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using System; | |
using System.Linq; | |
using System.Text; | |
using Mono.Cecil; | |
using Mono.Cecil.Cil; | |
using Mono.Cecil.Rocks; | |
using Mono.Collections.Generic; | |
// 23/07/2016 leonardosnt | |
namespace ConsoleApplication2 { | |
public class NotNullReplacer { | |
public static void Main(string[] args) { | |
if (args.Length < 3) { | |
Console.WriteLine("Missing args: [assembly_file] [out_file] [notnull_type]"); | |
Environment.Exit(0); | |
} | |
var asmFile = args[0]; | |
var outFile = args[1]; | |
var notNullType = args[2]; | |
Console.WriteLine($"asmFile = '{asmFile}'" ); | |
Console.WriteLine($"outFile = '{outFile}'" ); | |
Console.WriteLine($"notNullType = '{notNullType}'" ); | |
var asmDef = AssemblyDefinition.ReadAssembly(asmFile); | |
var methods = asmDef.MainModule.Types | |
.Where(t => t.IsClass) | |
.SelectMany(t => t.Methods) | |
.Where(m => !m.IsCompilerControlled && !m.IsAbstract && m.HasBody) | |
.Where(m => m.Parameters.Count > 0); | |
Func<int, Collection<VariableDefinition>, Instruction> GetStLocFor = (i, vars) => { | |
switch (i) { | |
case 0: | |
return Instruction.Create(OpCodes.Stloc_0); | |
case 1: | |
return Instruction.Create(OpCodes.Stloc_1); | |
case 2: | |
return Instruction.Create(OpCodes.Stloc_2); | |
case 3: | |
return Instruction.Create(OpCodes.Stloc_3); | |
default: | |
return Instruction.Create(OpCodes.Stloc_S, vars[i]); | |
} | |
}; | |
Func<int, Collection<VariableDefinition>, Instruction> GetLdLocFor = (i, vars) => { | |
switch (i) { | |
case 0: | |
return Instruction.Create(OpCodes.Ldloc_0); | |
case 1: | |
return Instruction.Create(OpCodes.Ldloc_1); | |
case 2: | |
return Instruction.Create(OpCodes.Ldloc_2); | |
case 3: | |
return Instruction.Create(OpCodes.Ldloc_3); | |
default: | |
return Instruction.Create(OpCodes.Ldloc_S, vars[i]); | |
} | |
}; | |
Func<MethodDefinition, string> prettyParams = md => { | |
var sb = new StringBuilder(); | |
foreach (var p in md.Parameters) { | |
var name = p.ParameterType.FullName; | |
switch (name) { | |
case "System.String": name = "string"; break; | |
case "System.Int32": name = "int"; break; | |
case "System.Int64": name = "long"; break; | |
case "System.UInt32": name = "uint"; break; | |
case "System.UInt64": name = "ulong"; break; | |
} | |
sb.Append(name); | |
sb.Append(" "); | |
sb.Append(p.Name); | |
sb.Append(", "); | |
} | |
if (sb.Length > 2) | |
sb.Remove(sb.Length - 2, 2); | |
return sb.ToString(); | |
}; | |
methods.ForEach(md => { | |
var paramIdx = md.Body.Variables.Count; | |
md.Parameters | |
.Where(m => m.CustomAttributes.Any(a => a.AttributeType.FullName.Equals(notNullType))) | |
.Where(m => !m.ParameterType.IsPrimitive) | |
.Reverse() | |
.ForEach(p => { | |
md.Body.Variables.Add(new VariableDefinition(asmDef.MainModule.Import(typeof(bool)))); | |
md.Body.SimplifyMacros(); | |
var instrs = md.Body.Instructions; | |
var sIdx = 0; | |
var argNullExcepType = asmDef.MainModule.Import(typeof(ArgumentException).GetConstructor(new[] { typeof(string) })); | |
var checkInstructions = new[] { | |
Instruction.Create(OpCodes.Ldarg, p), | |
Instruction.Create(OpCodes.Ldnull), | |
Instruction.Create(OpCodes.Ceq), | |
GetStLocFor(paramIdx, md.Body.Variables), | |
GetLdLocFor(paramIdx, md.Body.Variables), | |
Instruction.Create(OpCodes.Brfalse_S, instrs.First()), | |
Instruction.Create(OpCodes.Nop), | |
Instruction.Create(OpCodes.Ldstr, $"Argument for [NotNull] parameter '{p.Name}' " + | |
$"of '{md.DeclaringType}::{md.Name}({prettyParams(md)})' must not be null."), | |
Instruction.Create(OpCodes.Newobj, argNullExcepType), | |
Instruction.Create(OpCodes.Throw), | |
}; | |
checkInstructions.ForEach(i => { | |
Console.WriteLine(i); | |
instrs.Insert(sIdx++, i); | |
}); | |
md.Body.OptimizeMacros(); | |
paramIdx++; | |
}); | |
}); | |
asmDef.Write(outFile); | |
Console.ReadKey(); | |
} | |
} | |
} |
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