[all-commits] [llvm/llvm-project] acdd36: [ItaniumDemangle] reject A-F in FP literals (#82864)

[Ryan Prichard via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: acdd36e677e396909f700e5dfb519d907a6b4560
      https://github.com/llvm/llvm-project/commit/acdd36e677e396909f700e5dfb519d907a6b4560
  Author: Ryan Prichard <rprichard at google.com>
  Date:   2024-02-26 (Mon, 26 Feb 2024)

  Changed paths:
    M libcxxabi/src/demangle/ItaniumDemangle.h
    M libcxxabi/test/test_demangle.pass.cpp

  Log Message:
  -----------
  [ItaniumDemangle] reject A-F in FP literals (#82864)

The Itanium C++ ABI specifies that FP literals are encoded using a
lowercase hexadecimal string. Previously, libc++abi allowed uppercase
A-F characters but decoded them by subtracting 'a' from them, producing
negative digit values. It is especially confusing to accept an 'E' digit
because 'E' marks the end of the FP literal.



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