demonstration of function hooking inside world of warcraft, using cycript (http://www.cycript.org/)

smemalloc_hook.cy.js

var log = [];
var oldf = {}; // this object is used to access the original function from the hook

// address of smemalloc taken from:
// wow build 12340, macOS i386 build, md5: 1abfcf2cb17cdbe804c1c77d0525f1fa
var smemalloc = @encode(void*(int, char*, int, int))(0x9bad0)

var hook = function(a1, file, a3, a4) {
    var ptr = (*oldf)(a1, file, a3, a4);
    log.push([a1, file.toString(), a3, a4]);
    return ptr;
}

MS.hookFunction(smemalloc, hook, oldf);

example log contents: https://gist.github.com/jrsa/cf31f1aa35f62d009760480bc295321f