44af53b22a
The `ASTWriter` algorithm for computing affecting module maps uses `SourceManager::translateFile()` to get a `FileID` from a `FileEntry`. This is slow (O(n)) since the function performs a linear walk over `SLocEntries` until it finds one with a matching `FileEntry`. This patch removes this use of `SourceManager::translateFile()` by tracking `FileID` instead of `FileEntry` in couple of places in `ModuleMap`, giving `ASTWriter` the desired `FileID` directly. There are no changes required for clients that still want a `FileEntry` from `ModuleMap`: the existing APIs internally use `SourceManager` to perform the reverse `FileID` to `FileEntry` conversion in O(1).
The LLVM Compiler Infrastructure
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.
Getting the Source Code and Building LLVM
Consult the Getting Started with LLVM page for information on building and running LLVM.
For information on how to contribute to the LLVM project, please take a look at the Contributing to LLVM guide.
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Join the LLVM Discourse forums, Discord chat, LLVM Office Hours or Regular sync-ups.
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