使用 Mono.Cecil 添加静态构造函数会导致 TypeInitializationException
Adding static constructor with Mono.Cecil causes TypeInitializationException
我正在尝试使用 Mono Cecil 将静态构造函数添加到如下程序中:
namespace SimpleTarget
{
class C
{
public void M()
{
Console.WriteLine("Hello, World!");
}
}
}
以下代码添加了静态构造函数:
namespace AddStaticConstructor
{
class Program
{
static void Main(string[] args)
{
var assemblyPath = args[0];
var module = ModuleDefinition.ReadModule(assemblyPath);
var corlib = ModuleDefinition.ReadModule(typeof(object).Module.FullyQualifiedName);
var method = corlib.Types.First(t => t.Name.Equals("Console")).Methods.First(m => m.Name.Contains("WriteLine"));
var methodToCall = module.Import(method);
foreach (var type in module.Types)
{
if (!type.Name.Contains("C")) continue;
var staticConstructorAttributes =
Mono.Cecil.MethodAttributes.Private |
Mono.Cecil.MethodAttributes.HideBySig |
Mono.Cecil.MethodAttributes.Static |
Mono.Cecil.MethodAttributes.SpecialName |
Mono.Cecil.MethodAttributes.RTSpecialName;
MethodDefinition staticConstructor = new MethodDefinition(".cctor", staticConstructorAttributes, module.TypeSystem.Void);
type.Methods.Add(staticConstructor);
type.IsBeforeFieldInit = false;
var il = staticConstructor.Body.GetILProcessor();
il.Append(Instruction.Create(OpCodes.Ret));
Instruction ldMethodName = il.Create(OpCodes.Ldstr, type.FullName);
Instruction callOurMethod = il.Create(OpCodes.Call, methodToCall);
Instruction firstInstruction = staticConstructor.Body.Instructions[0];
// Inserts the callOurMethod instruction before the first instruction
il.InsertBefore(firstInstruction, ldMethodName);
il.InsertAfter(ldMethodName, callOurMethod);
}
module.Write(assemblyPath);
}
}
}
查看 dotPeek 中的反编译二进制文件,似乎一切都已正确设置。尝试使用修改后的 C
类型时,我得到一个带有内部异常 "System.InvalidProgramException: JIT Compiler encountered an internal limitation"
的 TypeInitializationException
在使用静态构造函数之前,我还需要正确设置什么吗?
谢谢!
问题是您在这里得到了 System.WriteLine
的错误重载:
var corlib = ModuleDefinition.ReadModule(typeof(object).Module.FullyQualifiedName);
var method = corlib.Types.First(t => t.Name.Equals("Console")).Methods.First(m => m.Name.Contains("WriteLine"));
var methodToCall = module.Import(method);
使用这个简单的代码获取您要使用的重载:
var wlMethod = typeof (Console).GetMethod(nameof(Console.WriteLine), new[] {typeof (string)});
var methodToCall = module.ImportReference(wlMethod);
我正在尝试使用 Mono Cecil 将静态构造函数添加到如下程序中:
namespace SimpleTarget
{
class C
{
public void M()
{
Console.WriteLine("Hello, World!");
}
}
}
以下代码添加了静态构造函数:
namespace AddStaticConstructor
{
class Program
{
static void Main(string[] args)
{
var assemblyPath = args[0];
var module = ModuleDefinition.ReadModule(assemblyPath);
var corlib = ModuleDefinition.ReadModule(typeof(object).Module.FullyQualifiedName);
var method = corlib.Types.First(t => t.Name.Equals("Console")).Methods.First(m => m.Name.Contains("WriteLine"));
var methodToCall = module.Import(method);
foreach (var type in module.Types)
{
if (!type.Name.Contains("C")) continue;
var staticConstructorAttributes =
Mono.Cecil.MethodAttributes.Private |
Mono.Cecil.MethodAttributes.HideBySig |
Mono.Cecil.MethodAttributes.Static |
Mono.Cecil.MethodAttributes.SpecialName |
Mono.Cecil.MethodAttributes.RTSpecialName;
MethodDefinition staticConstructor = new MethodDefinition(".cctor", staticConstructorAttributes, module.TypeSystem.Void);
type.Methods.Add(staticConstructor);
type.IsBeforeFieldInit = false;
var il = staticConstructor.Body.GetILProcessor();
il.Append(Instruction.Create(OpCodes.Ret));
Instruction ldMethodName = il.Create(OpCodes.Ldstr, type.FullName);
Instruction callOurMethod = il.Create(OpCodes.Call, methodToCall);
Instruction firstInstruction = staticConstructor.Body.Instructions[0];
// Inserts the callOurMethod instruction before the first instruction
il.InsertBefore(firstInstruction, ldMethodName);
il.InsertAfter(ldMethodName, callOurMethod);
}
module.Write(assemblyPath);
}
}
}
查看 dotPeek 中的反编译二进制文件,似乎一切都已正确设置。尝试使用修改后的 C
类型时,我得到一个带有内部异常 "System.InvalidProgramException: JIT Compiler encountered an internal limitation"
在使用静态构造函数之前,我还需要正确设置什么吗?
谢谢!
问题是您在这里得到了 System.WriteLine
的错误重载:
var corlib = ModuleDefinition.ReadModule(typeof(object).Module.FullyQualifiedName);
var method = corlib.Types.First(t => t.Name.Equals("Console")).Methods.First(m => m.Name.Contains("WriteLine"));
var methodToCall = module.Import(method);
使用这个简单的代码获取您要使用的重载:
var wlMethod = typeof (Console).GetMethod(nameof(Console.WriteLine), new[] {typeof (string)});
var methodToCall = module.ImportReference(wlMethod);