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llvm / llvm-project / c548c47476ee3f4578db2ca4f82e097a728b5bff
commitc548c47476ee3f4578db2ca4f82e097a728b5bff[log] [tgz]
authorOliver Hunt <oliver@apple.com>Wed Aug 06 09:52:34 2025 -0700
committerGitHub <noreply@github.com>Wed Aug 06 09:52:34 2025 -0700
tree40dbc05ee84220a3c8ca9bcb59592127efa6b3ea
parent01b0fe3104d633d67d33a963142a54cd500e6b3c [diff]
[clang] Fix crash in dynamic_cast final class optimization (#152076)

This corrects the codegen for the final class optimization to
correct handle the case where there is no path to perform the
cast, and also corrects the codegen to handle ptrauth protected
vtable pointers.

As part of this fix we separate out the path computation as
that makes it easier to reason about the failure code paths
and more importantly means we can know what the type of the
this object is during the cast.

The allows us to use the GetVTablePointer interface which
correctly performs the authentication operations required when
pointer authentication is enabled. This still leaves incorrect
authentication behavior in the multiple inheritance case but
currently the optimization is disabled entirely if pointer
authentication is enabled.

Fixes #137518
7 files changed
tree: 40dbc05ee84220a3c8ca9bcb59592127efa6b3ea
  1. .ci/
  2. .github/
  3. bolt/
  4. clang/
  5. clang-tools-extra/
  6. cmake/
  7. compiler-rt/
  8. cross-project-tests/
  9. flang/
  10. flang-rt/
  11. libc/
  12. libclc/
  13. libcxx/
  14. libcxxabi/
  15. libsycl/
  16. libunwind/
  17. lld/
  18. lldb/
  19. llvm/
  20. llvm-libgcc/
  21. mlir/
  22. offload/
  23. openmp/
  24. polly/
  25. runtimes/
  26. third-party/
  27. utils/
  28. .clang-format
  29. .clang-format-ignore
  30. .clang-tidy
  31. .git-blame-ignore-revs
  32. .gitattributes
  33. .gitignore
  34. .mailmap
  35. CODE_OF_CONDUCT.md
  36. CONTRIBUTING.md
  37. LICENSE.TXT
  38. pyproject.toml
  39. README.md
  40. SECURITY.md
README.md

The LLVM Compiler Infrastructure

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Welcome to the LLVM project!

This repository contains the source code for LLVM, a toolkit for the construction of highly optimized compilers, optimizers, and run-time environments.

The LLVM project has multiple components. The core of the project is itself called “LLVM”. This contains all of the tools, libraries, and header files needed to process intermediate representations and convert them into object files. Tools include an assembler, disassembler, bitcode analyzer, and bitcode optimizer.

C-like languages use the Clang frontend. This component compiles C, C++, Objective-C, and Objective-C++ code into LLVM bitcode -- and from there into object files, using LLVM.

Other components include: the libc++ C++ standard library, the LLD linker, and more.

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For information on how to contribute to the LLVM project, please take a look at the Contributing to LLVM guide.

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