I am working in the kernel module of XV6. I need to make a dynamic call like this:
proc->tf->eax = hashTable[index]->name();
But getting an error: error: called object is not a function or function pointer
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2Did you check the type of `name` before assuming you can just call it? It must be a function pointer in order to be callable. And if you didn't check, how are we supposed to know its type instead of you? – StoryTeller - Unslander Monica Mar 28 '17 at 06:43
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I guess `hashTable[index]->name` is a c-string, so: why do you think you can call it as a function?.... – LPs Mar 28 '17 at 06:46
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`name` is `char*` if name = abc, then abc() returns an integer. – Aditya Mhamunkar Mar 28 '17 at 06:48
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is there another way to call a function dynamically? – Aditya Mhamunkar Mar 28 '17 at 06:49
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2You need to map that string to a function pointer. C offers no reflection mechanism to find a function by name during run time. – StoryTeller - Unslander Monica Mar 28 '17 at 06:51
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1_name is char* if name = abc, then abc() returns an integer_.... using [tag:c]???.....You're a dreamer... ;) – LPs Mar 28 '17 at 07:11
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Instead of `char* name`, what I want is a function pointer. – Aditya Mhamunkar Mar 28 '17 at 07:29
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2But as @StoryTeller told, C provides no reflection. I would create a lookup table from function names to function pointers and use that to figure out what function to call. – Aditya Mhamunkar Mar 28 '17 at 07:33