Arnold Schwaighofer ebbe3aed1c IRGen: Add implementation for dynamically replaceable functions ...

A dynamically replaceable function calls through a global variable that
holds the function pointer.

struct ChainEntry {
   void *(funPtr)();
   struct ChainEntry *next;
}

ChainEntry dynamicallyReplaceableVar;

void dynamicallyReplaceableFunction() {
  dynamicallyReplaceableVar.funPtr()
}

dynamic replacements will be chainable so the global variable also
functions as the root entry in the chain of replacements.

A dynamic replacement functions can call the previous implementation by
going through its chain entry.

ChainEntry chainEntryOf_dynamic_replacement_for_foo;

void dynamic_replacement_for_foo() {
   // call the previous (original) implementation.
   chainEntryOf_dynamic_replacement_for_foo.funPtr();
}

2018-11-06 09:53:21 -08:00

44 KiB

Raw Blame History

View Raw