[all-commits] [llvm/llvm-project] 8eea47: [ItaniumDemangle] reject A-F in FP literals (#83061)

[Ryan Prichard via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 8eea478f57e79b6fad065d023355907bc2098206
      https://github.com/llvm/llvm-project/commit/8eea478f57e79b6fad065d023355907bc2098206
  Author: Ryan Prichard <rprichard at google.com>
  Date:   2024-02-27 (Tue, 27 Feb 2024)

  Changed paths:
    M llvm/include/llvm/Demangle/ItaniumDemangle.h

  Log Message:
  -----------
  [ItaniumDemangle] reject A-F in FP literals (#83061)

Sync this change to the copy of ItaniumDemangle.h in "llvm":

https://github.com/llvm/llvm-project/pull/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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