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[ASan][libc++] String annotations optimizations fix with lambda #76200

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merged 3 commits into from Jan 8, 2024
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[ASan][libc++] String annotations optimizations fix with lambda #76200

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[ASan][libc++] String annotations optimizations fix with lambda
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5 changes: 4 additions & 1 deletion libcxx/include/string
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Expand Up @@ -922,7 +922,10 @@ public:
// Turning off ASan instrumentation for variable initialization with _LIBCPP_STRING_INTERNAL_MEMORY_ACCESS
// does not work consistently during initialization of __r_, so we instead unpoison __str's memory manually first.
// __str's memory needs to be unpoisoned only in the case where it's a short string.
: __r_(((__str.__is_long() ? 0 : (__str.__annotate_delete(), 0)), std::move(__str.__r_))) {
// Lambda is used because of optimization challenges encountered within comma constructors.
// Lambda with argument is correctly optimized, but it does not solve the problem with internal memory
// access macro.
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: __r_([](basic_string &__s){ if(!__s.__is_long()) __s.__annotate_delete(); return std::move(__s.__r_);}(__str)) {
__str.__r_.first() = __rep();
__str.__annotate_new(0);
if (!__is_long())
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