call frame
Asked on 04/09/2025
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The concept of a "call frame" is discussed in the session titled "Explore Swift performance" at WWDC 2024. A call frame is essentially the memory allocated for a function to execute, and it is traditionally allocated on the stack. This allocation is done by subtracting from the stack pointer at the start of the function, and deallocating by adding back to the stack pointer before the function returns. The call frame can be thought of as having a layout similar to a C struct, where the local state of the function becomes fields in the call frame. This is considered ideal because the compiler always emits the necessary instructions to allocate this space, making it an efficient way to manage memory for function execution.
For more details, you can refer to the session Explore Swift performance (07:38).
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