forked from OSchip/llvm-project
13d04e766a
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: mgorny, llvm-commits, hiraditya Differential Revision: https://reviews.llvm.org/D48370 llvm-svn: 338825 |
||
---|---|---|
.. | ||
ADT | ||
Analysis | ||
AsmParser | ||
BinaryFormat | ||
Bitcode | ||
CodeGen | ||
DebugInfo | ||
Demangle | ||
ExecutionEngine | ||
FuzzMutate | ||
IR | ||
LineEditor | ||
Linker | ||
MC | ||
MI | ||
Object | ||
ObjectYAML | ||
Option | ||
Passes | ||
ProfileData | ||
Support | ||
Target | ||
Transforms | ||
XRay | ||
tools | ||
CMakeLists.txt |