[all-commits] [llvm/llvm-project] b2c3ae: [Sema] Don't check bounds for function pointer

Aleksandr Platonov via All-commits all-commits at lists.llvm.org
Wed Apr 13 10:43:29 PDT 2022

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: b2c3ae0b6f05fd0c2184aea82637685a13b8dc4f
  Author: Aleksandr Platonov <platonov.aleksandr at huawei.com>
  Date:   2022-04-13 (Wed, 13 Apr 2022)

  Changed paths:
    M clang/lib/Sema/SemaChecking.cpp
    M clang/test/Sema/unbounded-array-bounds.c

  Log Message:
  [Sema] Don't check bounds for function pointer

Currently, clang crashes with i386 target on the following code:
void f() {
  f + 0xdead000000000000UL;
This problem is similar to the problem fixed in D104424, but that fix can't handle function pointer case, because `getTypeSizeInCharsIfKnown()` says that size is known and equal to 0 for function type.

This patch prevents bounds checking for function pointer, thus fixes the crash.

Fixes https://github.com/llvm/llvm-project/issues/50463

Reviewed By: erichkeane

Differential Revision: https://reviews.llvm.org/D122748

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