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Summary: This change implements the profile loading functionality in LLVM to support XRay's profiling mode in compiler-rt. We introduce a type named `llvm::xray::Profile` which allows building a profile representation. We can load an XRay profile from a file to build Profile instances, or do it manually through the Profile type's API. The intent is to get the `llvm-xray` tool to generate `Profile` instances and use that as the common abstraction through which all conversion and analysis can be done. In the future we can generate `Profile` instances from `Trace` instances as well, through conversion functions. Some of the key operations supported by the `Profile` API are: - Path interning (`Profile::internPath(...)`) which returns a unique path identifier. - Block appending (`Profile::addBlock(...)`) to add thread-associated profile information. - Path ID to Path lookup (`Profile::expandPath(...)`) to look up a PathID and return the original interned path. - Block iteration. A 'Path' in this context represents the function call stack in leaf-to-root order. This is represented as a path in an internally managed prefix tree in the `Profile` instance. Having a handle (PathID) to identify the unique Paths we encounter for a particular Profile allows us to reduce the amount of memory required to associate profile data to a particular Path. This is the first of a series of patches to migrate the `llvm-stacks` tool towards using a single profile representation. Depends on D48653. Reviewers: kpw, eizan Reviewed By: kpw Subscribers: kpw, thakis, mgorny, llvm-commits, hiraditya Differential Revision: https://reviews.llvm.org/D48370 llvm-svn: 341012 |
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| runtimes | ||
| test | ||
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| .arcconfig | ||
| .clang-format | ||
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| CMakeLists.txt | ||
| CODE_OWNERS.TXT | ||
| configure | ||
| CREDITS.TXT | ||
| LICENSE.TXT | ||
| llvm.spec.in | ||
| LLVMBuild.txt | ||
| README.txt | ||
| RELEASE_TESTERS.TXT | ||
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