int check_fa_work (const char *, const char *) __attribute__((noinline));
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int check_fa_work (const char *, const char *) __attribute__((noinline));
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int check_fa_mid (const char *) __attribute__((noinline));
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int check_fa_mid (const char *) __attribute__((noinline));
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int check_fa (char *) __attribute__((noinline));
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int check_fa (char *) __attribute__((noinline));
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int how_much (void) __attribute__((noinline));
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int how_much (void) __attribute__((noinline));
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int check_fa_work (const char *c, const char *f)
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int check_fa_work (const char *c, const char *f)
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{
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{
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const char d = 0;
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const char d = 0;
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if (c >= &d)
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if (c >= &d)
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return c >= f && f >= &d;
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return c >= f && f >= &d;
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else
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else
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return c <= f && f <= &d;
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return c <= f && f <= &d;
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}
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}
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int check_fa_mid (const char *c)
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int check_fa_mid (const char *c)
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{
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{
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const char *f = __builtin_frame_address (0);
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const char *f = __builtin_frame_address (0);
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/* Prevent a tail call to check_fa_work, eliding the current stack frame. */
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/* Prevent a tail call to check_fa_work, eliding the current stack frame. */
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return check_fa_work (c, f) != 0;
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return check_fa_work (c, f) != 0;
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}
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}
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int check_fa (char *unused)
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int check_fa (char *unused)
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{
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{
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const char c = 0;
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const char c = 0;
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return check_fa_mid (&c);
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return check_fa_mid (&c);
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}
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}
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int how_much (void)
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int how_much (void)
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{
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{
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return 8;
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return 8;
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}
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}
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int main (void)
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int main (void)
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{
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{
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char *unused = __builtin_alloca (how_much ());
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char *unused = __builtin_alloca (how_much ());
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if (!check_fa(unused))
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if (!check_fa(unused))
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abort();
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abort();
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return 0;
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return 0;
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}
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}
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