can gccjit support ternary condition operator?

[zhao xin]

Hi,
I am writing a simple Lua JIT toy by using the GGC JIT. and Lua has the grammar "a and b", the usage just like below
--------
local a = nil
print(a and a.b)
a = { b = 1 }
print(a and a.b)
--------
it will print

--------
nil
1
--------


it is different with the C “&&” grammar,  but more like the C ternary condition operator  "a ? a : b".

and I didn't find the relevant API in GCC JIT,  so it may only be used to use alternatives  "({int _temp; if (cond) _temp=then; else _temp=otherwise; _temp;})"


but, it can not use in the global variable, here is the C++ code
--------
#define GET_SIZE(cond, then, otherwise) ({int _temp; if (cond) _temp=then; else _temp=otherwise; _temp;})

std::string *s = 0;
//auto size = GET_SIZE(s, s->size(), 0);   // compile fail : statement-expressions are not allowed outside functions nor in template-argument lists
auto size = auto size = s ? s->size() : 0;   // compile ok

int main() {
    std::cout << GET_SIZE(s, s->size(), 0) << std::endl;    // compile ok
    return 0;
}

--------


so is there any other way to implement "a and b"? or maybe add ternary condition operator support in GCC JIT?


thanks
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