llvm-6502/include/llvm/Transforms/RSProfiling.h
2007-05-01 21:15:47 +00:00

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1.5 KiB
C++

//===- RSProfiling.cpp - Various profiling using random sampling ----------===//
//
// The LLVM Compiler Infrastructure
//
// This file was developed by the LLVM research group and 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.
//
//===----------------------------------------------------------------------===//
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 const int ID; // Pass identification, replacement for typeinfo
RSProfilers() : ModulePass((intptr_t)&ID) {}
/// isProfiling - This method returns true if the value passed it was
/// inserted by the profiler.
virtual bool isProfiling(Value* v) = 0;
};
}