Function getTrampolinePrologueStart

src/e9patch/e9optimize.cpp:135–159

* Calculate the start of the trampoline prologue. */

 * Calculate the start of the trampoline prologue.
 */
const Instr *getTrampolinePrologueStart(const EntrySet &Es, const Instr *I)
{
    if (!option_Opeephole)
        return nullptr;
    auto i = Es.find(I->addr);
    if (i == Es.end())
        return nullptr;
    const EntryPoint &E = i->second;
    if (E.I != I)
        return nullptr;

    auto j = Es.begin();
    const Instr *J = I, *K = nullptr;
    while (i != j)
    {
        J = J->prev();
        i--;
        const EntryPoint &F = i->second;
        if (F.I != E.I)
            break;
        if (F.target32 || F.target8)
            K = J;
    }
    return K;
}

/*
 * Get the corresponding trampoline entry if it exists, else INTPTR_MIN.