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Asked: 2026-05-24T17:06:08+00:00

The malloc function always allocate memory on the heap. However, while studying the Escape

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The malloc function always allocate memory on the heap. However, while studying the Escape Analylis Article on Wikipedia, I came to know that as an optimization, a compiler can convert heap allocations to stack allocations. For example, if it sees that an allocated memory is only used and then freed inside a function.

Now my question is, is there a way that the programmer can do so himself. That is allocate memory on stack? I know C99 allows a variable to be given as size for an array declaration, but say the programmer wants to resize it. Can it be done?

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1 Answer

  1. Editorial Team

    alloca() is what you’re looking for. Of course, if you know your structures dimensions statically, it’d be better to use local variables instead.

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