[开发杂项][编译][C/C++]function hook

#include <cstdint>
#include <iostream>

#define ALIAS(fn)   __attribute__ ((alias (#fn), used))

static char buf[256];

extern "C"
{
    void* my_malloc(size_t size) {
        std::cout << "custom mallocn";
        return buf;
    }

    void my_free(void* p) {
        std::cout << "custom freen";
    }

    void* malloc(size_t size) ALIAS(my_malloc);
    void free(void* ptr) ALIAS(my_free);
}

struct S {
    S() {}
    uint32_t a;
}__attribute__((aligned(64)));

struct S1 {
    uint32_t a;
};

int main() {
    auto s = new S();
    delete s;
}

[xxxxx@localhost test]$ g++ test.cc --std=c++17 -g3 -O0
[xxxxx@localhost test]$ ./a.out
custom free
[xxxxx@localhost test]$

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