forked from OSchip/llvm-project
080866470d
In the future Windows will enable Control-flow Enforcement Technology (CET aka shadow stacks). To protect the path where the context is updated during exception handling, the binary is required to enumerate valid unwind entrypoints in a dedicated section which is validated when the context is being set during exception handling. This change allows llvm to generate the section that contains the appropriate symbol references in the form expected by the msvc linker. This feature is enabled through a new module flag, ehcontguard, which was modelled on the cfguard flag. The change includes a test that when the module flag is enabled the section is correctly generated. The set of exception continuation information includes returns from exceptional control flow (catchret in llvm). In order to collect catchret we: 1) Includes an additional flag on machine basic blocks to indicate that the given block is the target of a catchret operation, 2) Introduces a new machine function pass to insert and collect symbols at the start of each block, and 3) Combines these targets with the other EHCont targets that were already being collected. Change originally authored by Daniel Frampton <dframpto@microsoft.com> For more details, see MSVC documentation for `/guard:ehcont` https://docs.microsoft.com/en-us/cpp/build/reference/guard-enable-eh-continuation-metadata Reviewed By: pengfei Differential Revision: https://reviews.llvm.org/D94835 |
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README.txt
The LLVM Compiler Infrastructure ================================ This directory and its subdirectories contain source code for LLVM, a toolkit for the construction of highly optimized compilers, optimizers, and runtime environments. LLVM is open source software. You may freely distribute it under the terms of the license agreement found in LICENSE.txt. Please see the documentation provided in docs/ for further assistance with LLVM, and in particular docs/GettingStarted.rst for getting started with LLVM and docs/README.txt for an overview of LLVM's documentation setup. If you are writing a package for LLVM, see docs/Packaging.rst for our suggestions.