what is use of stack in exception handling.. and what is stack unwinding
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Which language? Java, .NET?Originally posted by dami -
As there has been no reply regarding language this question is being moved to the Miscellaneous Discussions forum.
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Stack unwinding is the name given to the process of undoing all of the processing in a series of nested calls.
That is:
Funcation A calls Function B calls Function C.
In function C there are 3 stack frames. Should FunctionC throw an exception, the program will go directly to the nearest catch block. That is, FunctionC will not return. Hence, FunctionB will not return andhence FunctionA will not return. That means the stack frame for FunctionC cannot be cleaned up, nor the stack frame for FuncitonB and the stack frame for FunctionC.
Stack unwinding applies to the cleaning up of FunctionB and FunctionA stack frames so that the program is in the state that FunctionA was never called in the first place. FunctionC must clean itself up before exiting top the catch block.
This applies to C++, Java and C#.Comment
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