问题描述

我正在尝试追踪单声道运行时中的一个错误，其中一个变量似乎被分配给一个有效对象，然后被重新分配给一个虚假对象，特别是

I am trying to track down a bug in the mono runtime where a variable appears to be allocated to one valid object, and then is reassigned later to a bogus object, specifically

//early in code I allocate, fine
var o = new object(); // valid allocation
// later in code this is called, not fine
lock(o) // <- is triggering bug due to "o" now referencing a nonsense memory location.

我想知道对o"的引用何时变得无意义，为此我正在寻找一种方法来确定 C# 代码中各个时间点的o"地址.我知道与其他问题类似，答案是不要这样做，有 GC"，但 GC 不起作用，所以我需要一个解决方法.

I would like to know when the reference to "o" becomes nonsense, and to do this am looking for a way to determine the address of "o" at various timepoints within the C# code. I know is similar to other questions with answers "don't do that there is a GC", but the GC doesn't work so I need a workaround.

有谁知道如何确定 C# 中单声道对象的地址?可以链接非托管代码或其他任何内容.(任何其他线索来诊断主要问题的方法都值得赞赏).

Does anyone know how I can determine the address of a mono object in C#? Am fine to link in unmanaged code or whatever. (Any other clues to ways to diagnose the main issue appreciated to).

推荐答案

原来这在 .NET 中无法直接实现，但可以通过更改 mono 运行时代码来实现.要创建可以读取内存地址的 C# 方法，请对 mono 源代码进行以下更改:

Turns out this is not possible in .NET directly, but can be accomplished by altering the mono runtime code. To create a C# method that can read the memory address, make the following changes to the mono source code:

修改 gc-internal.h 以添加

Alter gc-internal.h to add

gpointer    ves_icall_System_GCHandle_GetAddrOfObject (MonoObject *obj) MONO_INTERNAL;

更改 gc.c 以添加:

Alter gc.c to add:

gpointer    ves_icall_System_GCHandle_GetAddrOfObject (MonoObject *obj) {
    return (char*)obj;
}

更改 GCHandle.cs 以添加:

Alter GCHandle.cs to add:

MethodImplAttribute(MethodImplOptions.InternalCall)]
private extern static IntPtr GetAddrOfObject(object obj);

public static IntPtr AddrOfObject(object o)
{
    IntPtr res = GetAddrOfObject(o);
    return res;
}

修改 icall-def.h 以添加

Alter icall-def.h to add

ICALL(GCH_6, "GetAddrOfObject", ves_icall_System_GCHandle_GetAddrOfObject)

请注意，这些必须按顺序排列，因此将其添加到 GetAddrOfPinnedObject 行上方重建

Note that these must be in order, so add it above the GetAddrOfPinnedObject line Rebuild

最后，从 C# 调用它

Finally, call it from C#

for (int i = 0; i < 100; i++) {
    object o = new object ();
    var ptr = GCHandle.AddrOfObject (o);
    Console.WriteLine ("Address: " + ptr.ToInt64().ToString ("x"));
}

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