TEST(__cxa_demangle, cxa_demangle_fuzz_152588929) { #ifdefined(__aarch64__) // Test the C++ demangler on an invalid mangled string. libc++abi currently // parses it like so: // (1 "\006") (I (L e "eeEEEEEEEEEEEEEEEEEEEEEEEEEEEEEE" E) E) // There are a few interesting things about this mangled input: // - The IA64 C++ ABI specifies that an FP literal's hex chars are lowercase. // The libc++abi demangler currently accepts uppercase A-F digits, which is // confusing because 'E' is supposed to mark the end of the <expr-primary>. // - libc++abi uses snprintf("%a") which puts an unspecified number of bits // in the digit before the decimal point. // - The identifier name is "\006", and the IA64 C++ ABI spec is explicit // about not specifying the encoding for characters outside of // [_A-Za-z0-9]. // - The 'e' type is documented as "long double, __float80", and in practice // the length of the literal depends on the arch. For arm64, it is a // 128-bit FP type encoded using 32 hex chars. The situation with x86-64 // Android OTOH is messy because Clang uses 'g' for its 128-bit // long double. char* p = abi::__cxa_demangle("1\006ILeeeEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEE", 0, 0, 0); if (p && !strcmp(p, "\x6<-0x1.cecececececececececececececep+11983")) { // Prior to llvm.org/D77924, libc++abi left off the "L>" suffix.
} elseif (p && !strcmp(p, "\x6<-0x1.cecececececececececececececep+11983L>")) { // After llvm.org/D77924, the "L>" suffix is present. libc++abi // accepts A-F digits but decodes each using (digit - 'a' + 10), turning 'E' // into -18.
} else { // TODO: Remove the other accepted outputs, because libc++abi probably // should reject this input.
ASSERT_EQ(nullptr, p) << p;
}
free(p); #endif
}
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