StackOverflow2013

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plurals

PO
primarykey
Id
5044263
data
AcceptedAnswerId
0
AnswerCount
0
ClosedDate
CommentCount
2
CommunityOwnedDate
CreationDate
2011-02-18T17:07:07.380
FavoriteCount
0
LastActivityDate
2014-11-24T10:36:11.323
LastEditDate
2017-05-23T12:15:20.657
LastEditorUserId
-1
OwnerUserId
23715
ParentId
5034599
PostTypeId
2
Score
5
ViewCount
0
LastEditorDisplayName
text
Body
After some investigation: The helper, that saves the situation from crashing, is another register - EBP, base pointer that points to the beginning of stack frame. All access to function's local variables is done through this pointer (except for optimized code, see the edit below). Before the function returns, the stack pointer is reset to the base pointer's value. Before a function (say PInvoke) calls another function (imported DLL's function), the stack pointer points to the end of the caller function's local variables. Then the caller pushes parameters to the stack and calls that other function. In the described situation, when a function calls another function as being __stdcall, while it is actually __cdecl, nobody clears the stack from these parameters. So, after return from the callee, the stack pointer points to the end of the pushed parameters block. It is like the caller function (PInvoke) just got several more local variables. Since access to the caller's local variables is done through the base pointer, it does not break anything. The only bad thing that may happen, is if the callee function will be called many times at once. In this case the stack will grow and may overflow. But since PInvoke calls the DLL's function only once, and then returns, the stack pointer just resets to the base pointer, and all is well. Edit: As noted <a href="https://stackoverflow.com/a/5358339/23715">here</a>, the code may also be optimized to store local variables in CPU registers only. In this case EBP is not used and thus invalid ESP may cause returning to invalid address.
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1. This table or related slice is empty.
PostParentId
1. POWhy isn't PInvoke crashing in case of violated calling convention (in .NET 3.5)?
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1. PTAnswer
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1. USCommunity
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1. USAlex Che
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1. POWhy isn't PInvoke crashing in case of violated calling convention (in .NET 3.5)?
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1. VO
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2. VO
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3. VO
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1. This table or related slice is empty.

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