4a58116b7e
This fixes two bugs in `WebAssemblyExceptionInfo` grouping, created by D97247. These two bugs are not easy to split into two different CLs, because tests that fail for one also tend to fail for the other. - In D97247, when fixing `ExceptionInfo` grouping by taking out the unwind destination' exception from the unwind src's exception, we just iterated the BBs in the function order, but this was incorrect; this changes it to dominator tree preorder. Please refer to the comments in the code for the reason and an example. - After this subexception-taking-out fix, there still can be remaining BBs we have to take out. When Exception B is taken out of Exception A (because EHPad B is the unwind destination of EHPad A), there can still be BBs within Exception A that are reachable from Exception B, which also should be taken out. Please refer to the comments in the code for more detailed explanation on why this can happen. To make this possible, this splits `WebAssemblyException::addBlock` into two parts: adding to a set and adding to a vector. We need to iterate on BBs within a `WebAssemblyException` to fix this, so we add BBs to sets first. But we add BBs to vectors later after we fix all incorrectness because deleting BBs from vectors is expensive. I considered removing the vector from `WebAssemblyException`, but it was not easy because this class has to maintain a similar interface with `MachineLoop` to be wrapped into a single interface `SortRegion`, which is used in CFGSort. Other misc. drive-by fixes: - Make `WebAssemblyExceptionInfo` do not even run when wasm EH is not used or the function doesn't have any EH pads, not to waste time - Add `LLVM_DEBUG` lines for easy debugging - Fix `preds` comments in cfg-stackify-eh.ll - Fix `__cxa_throw`'s signature in cfg-stackify-eh.ll Fixes https://github.com/emscripten-core/emscripten/issues/13554. Reviewed By: dschuff, tlively Differential Revision: https://reviews.llvm.org/D97677 |
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| .github | ||
| clang | ||
| clang-tools-extra | ||
| compiler-rt | ||
| debuginfo-tests | ||
| flang | ||
| libc | ||
| libclc | ||
| libcxx | ||
| libcxxabi | ||
| libunwind | ||
| lld | ||
| lldb | ||
| llvm | ||
| mlir | ||
| openmp | ||
| parallel-libs | ||
| polly | ||
| pstl | ||
| runtimes | ||
| utils/arcanist | ||
| .arcconfig | ||
| .arclint | ||
| .clang-format | ||
| .clang-tidy | ||
| .git-blame-ignore-revs | ||
| .gitignore | ||
| CONTRIBUTING.md | ||
| README.md | ||
README.md
The LLVM Compiler Infrastructure
This directory and its sub-directories contain source code for LLVM, a toolkit for the construction of highly optimized compilers, optimizers, and run-time environments.
The README briefly describes how to get started with building LLVM. For more information on how to contribute to the LLVM project, please take a look at the Contributing to LLVM guide.
Getting Started with the LLVM System
Taken from https://llvm.org/docs/GettingStarted.html.
Overview
Welcome to the LLVM project!
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 converts it into object files. Tools include an assembler, disassembler, bitcode analyzer, and bitcode optimizer. It also contains basic regression tests.
C-like languages use the Clang front end. 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.
Getting the Source Code and Building LLVM
The LLVM Getting Started documentation may be out of date. The Clang Getting Started page might have more accurate information.
This is an example work-flow and configuration to get and build the LLVM source:
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Checkout LLVM (including related sub-projects like Clang):
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git clone https://github.com/llvm/llvm-project.git -
Or, on windows,
git clone --config core.autocrlf=false https://github.com/llvm/llvm-project.git
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Configure and build LLVM and Clang:
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cd llvm-project -
cmake -S llvm -B build -G <generator> [options]Some common build system generators are:
Ninja--- for generating Ninja build files. Most llvm developers use Ninja.Unix Makefiles--- for generating make-compatible parallel makefiles.Visual Studio--- for generating Visual Studio projects and solutions.Xcode--- for generating Xcode projects.
Some Common options:
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-DLLVM_ENABLE_PROJECTS='...'--- semicolon-separated list of the LLVM sub-projects you'd like to additionally build. Can include any of: clang, clang-tools-extra, libcxx, libcxxabi, libunwind, lldb, compiler-rt, lld, polly, or debuginfo-tests.For example, to build LLVM, Clang, libcxx, and libcxxabi, use
-DLLVM_ENABLE_PROJECTS="clang;libcxx;libcxxabi". -
-DCMAKE_INSTALL_PREFIX=directory--- Specify for directory the full path name of where you want the LLVM tools and libraries to be installed (default/usr/local). -
-DCMAKE_BUILD_TYPE=type--- Valid options for type are Debug, Release, RelWithDebInfo, and MinSizeRel. Default is Debug. -
-DLLVM_ENABLE_ASSERTIONS=On--- Compile with assertion checks enabled (default is Yes for Debug builds, No for all other build types).
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cmake --build build [-- [options] <target>]or your build system specified above directly.-
The default target (i.e.
ninjaormake) will build all of LLVM. -
The
check-alltarget (i.e.ninja check-all) will run the regression tests to ensure everything is in working order. -
CMake will generate targets for each tool and library, and most LLVM sub-projects generate their own
check-<project>target. -
Running a serial build will be slow. To improve speed, try running a parallel build. That's done by default in Ninja; for
make, use the option-j NNN, whereNNNis the number of parallel jobs, e.g. the number of CPUs you have.
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For more information see CMake
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Consult the Getting Started with LLVM page for detailed information on configuring and compiling LLVM. You can visit Directory Layout to learn about the layout of the source code tree.