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tricks for annotating entry and exit from regions in disassembly

one tricky

template<int>
__attribute__((noinline)) void ASM_MARK() {
    [[maybe_unused]] volatile int noop = 0;
}

void foo() {
    ASM_MARK<1>();
    volatile int x = 7;
    ASM_MARK<2>();
}

another trick uses these pairs

void __attribute__((noinline)) enter() { volatile asm(""); }
void __attribute__((noinline)) leave() { volatile asm(""); }