stackalloc | 易学教程

When would I need to use the stackalloc keyword in C#?

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问题 What functionality does the stackalloc keyword provide? When and Why would I want to use it? 回答1: From MSDN: Used in an unsafe code context to allocate a block of memory on the stack. One of the main features of C# is that you do not normally need to access memory directly, as you would do in C/C++ using malloc or new . However, if you really want to explicitly allocate some memory you can, but C# considers this "unsafe", so you can only do it if you compile with the unsafe setting.

Is c# compiler deciding to use stackalloc by itself?

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问题 I found a blog entry which suggests that sometimes c# compiler may decide to put array on the stack instead of the heap: Improving Performance Through Stack Allocation (.NET Memory Management: Part 2) This guy claims that: The compiler will also sometimes decide to put things on the stack on its own. I did an experiment with TestStruct2 in which I allocated it both an unsafe and normal context. In the unsafe context the array was put on the heap, but in the normal context when I looked into

Is c# compiler deciding to use stackalloc by itself?

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C# Returning a pointer created with stackalloc inside a function

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问题 I have C# code that interacts with C++ code, which performs operations with strings. I have this piece of code in a static helper class: internal static unsafe byte* GetConstNullTerminated(string text, Encoding encoding) { int charCount = text.Length; fixed (char* chars = text) { int byteCount = encoding.GetByteCount(chars, charCount); byte* bytes = stackalloc byte[byteCount + 1]; encoding.GetBytes(chars, charCount, bytes, byteCount); *(bytes + byteCount) = 0; return bytes; } } As you can see

Buffer overflow protection for stackalloc in .Net

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问题 From C# reference for stackalloc: the use of stackalloc automatically enables buffer overrun detection features in the common language runtime (CLR). If a buffer overrun is detected, the process is terminated as quickly as possible to minimize the chance that malicious code is executed. Specifically, what kind of protection mechanism is implemented for .NET? And will it also detect buffer underruns? Against which known attacks is the protection weaker? For a context, for example for MS C++

C# & .NET: stackalloc

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问题 I have a few questions about the functionality of the stackalloc operator. How does it actually allocate? I thought it does something like: void* stackalloc(int sizeInBytes) { void* p = StackPointer (esp); StackPointer += sizeInBytes; if(StackPointer exceeds stack size) throw new StackOverflowException(...); return p; } But I have done a few tests, and I'm not sure that's how it work. We can't know exactly what it does and how it does it, but I want to know the basics. I thought that stack

Practical use of `stackalloc` keyword

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Has anyone ever actually used stackalloc while programming in C#? I am aware of what is does, but the only time it shows up in my code is by accident, because Intellisense suggests it when I start typing static , for example. Although it is not related to the usage scenarios of stackalloc , I actually do a considerable amount of legacy interop in my apps, so every now and then I could resort to using unsafe code. But nevertheless I usually find ways to avoid unsafe completely. And since stack size for a single thread in .Net is ~1Mb (correct me if I'm wrong), I am even more reserved from using

Practical use of `stackalloc` keyword

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问题 Has anyone ever actually used stackalloc while programming in C#? I am aware of what is does, but the only time it shows up in my code is by accident, because Intellisense suggests it when I start typing static , for example. Although it is not related to the usage scenarios of stackalloc , I actually do a considerable amount of legacy interop in my apps, so every now and then I could resort to using unsafe code. But nevertheless I usually find ways to avoid unsafe completely. And since stack