| //===- RSProfiling.cpp - Various profiling using random sampling ----------===// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // This file is distributed under the University of Illinois Open Source |
| // License. See LICENSE.TXT for details. |
| // |
| //===----------------------------------------------------------------------===// |
| // |
| // This file defines the abstract interface that a profiler must implement to |
| // support the random profiling transform. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #ifndef LLVM_TRANSFORMS_RSPROFILING_H |
| #define LLVM_TRANSFORMS_RSPROFILING_H |
| |
| namespace llvm { |
| //===--------------------------------------------------------------------===// |
| /// RSProfilers - The basic Random Sampling Profiler Interface Any profiler |
| /// that implements this interface can be transformed by the random sampling |
| /// pass to be sample based rather than always on. |
| /// |
| /// The only exposed function can be queried to find out if an instruction |
| /// was original or if it was inserted by the profiler. Implementations of |
| /// this interface are expected to chain to other implementations, such that |
| /// multiple profilers can be support simultaniously. |
| struct RSProfilers : public ModulePass { |
| static char ID; // Pass identification, replacement for typeinfo |
| RSProfilers() : ModulePass(&ID) {} |
| |
| /// isProfiling - This method returns true if the value passed it was |
| /// inserted by the profiler. |
| virtual bool isProfiling(Value* v) = 0; |
| }; |
| } |
| |
| #endif |