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//===- ProfileDataLoader.h - Load & convert profile info ----*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// The ProfileDataLoader class is used to load profiling data from a dump file.
// The ProfileDataT<FType, BType> class is used to store the mapping of this
// data to control flow edges.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_ANALYSIS_PROFILEDATALOADER_H
#define LLVM_ANALYSIS_PROFILEDATALOADER_H
#include "llvm/ADT/DenseMap.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/ErrorHandling.h"
#include <string>
namespace llvm {
class ModulePass;
class Function;
class BasicBlock;
// Helper for dumping edges to dbgs().
raw_ostream& operator<<(raw_ostream &O, std::pair<const BasicBlock *,
const BasicBlock *> E);
/// \brief The ProfileDataT<FType, BType> class is used to store the mapping of
/// profiling data to control flow edges.
///
/// An edge is defined by its source and sink basic blocks.
template<class FType, class BType>
class ProfileDataT {
public:
// The profiling information defines an Edge by its source and sink basic
// blocks.
typedef std::pair<const BType*, const BType*> Edge;
private:
typedef DenseMap<Edge, unsigned> EdgeWeights;
/// \brief Count the number of times a transition between two blocks is
/// executed.
///
/// As a special case, we also hold an edge from the null BasicBlock to the
/// entry block to indicate how many times the function was entered.
DenseMap<const FType*, EdgeWeights> EdgeInformation;
public:
/// getFunction() - Returns the Function for an Edge.
static const FType *getFunction(Edge e) {
// e.first may be NULL
assert(((!e.first) || (e.first->getParent() == e.second->getParent()))
&& "A ProfileData::Edge can not be between two functions");
assert(e.second && "A ProfileData::Edge must have a real sink");
return e.second->getParent();
}
/// getEdge() - Creates an Edge between two BasicBlocks.
static Edge getEdge(const BType *Src, const BType *Dest) {
return Edge(Src, Dest);
}
/// getEdgeWeight - Return the number of times that a given edge was
/// executed.
unsigned getEdgeWeight(Edge e) const {
const FType *f = getFunction(e);
assert((EdgeInformation.find(f) != EdgeInformation.end())
&& "No profiling information for function");
EdgeWeights weights = EdgeInformation.find(f)->second;
assert((weights.find(e) != weights.end())
&& "No profiling information for edge");
return weights.find(e)->second;
}
/// addEdgeWeight - Add 'weight' to the already stored execution count for
/// this edge.
void addEdgeWeight(Edge e, unsigned weight) {
EdgeInformation[getFunction(e)][e] += weight;
}
};
typedef ProfileDataT<Function, BasicBlock> ProfileData;
//typedef ProfileDataT<MachineFunction, MachineBasicBlock> MachineProfileData;
/// The ProfileDataLoader class is used to load raw profiling data from the
/// dump file.
class ProfileDataLoader {
private:
/// The name of the file where the raw profiling data is stored.
const std::string &Filename;
/// A vector of the command line arguments used when the target program was
/// run to generate profiling data. One entry per program run.
SmallVector<std::string, 1> CommandLines;
/// The raw values for how many times each edge was traversed, values from
/// multiple program runs are accumulated.
SmallVector<unsigned, 32> EdgeCounts;
public:
/// ProfileDataLoader ctor - Read the specified profiling data file, exiting
/// the program if the file is invalid or broken.
ProfileDataLoader(const char *ToolName, const std::string &Filename);
/// A special value used to represent the weight of an edge which has not
/// been counted yet.
static const unsigned Uncounted;
/// The maximum value that can be stored in a profiling counter.
static const unsigned MaxCount;
/// getNumExecutions - Return the number of times the target program was run
/// to generate this profiling data.
unsigned getNumExecutions() const { return CommandLines.size(); }
/// getExecution - Return the command line parameters used to generate the
/// i'th set of profiling data.
const std::string &getExecution(unsigned i) const { return CommandLines[i]; }
const std::string &getFileName() const { return Filename; }
/// getRawEdgeCounts - Return the raw profiling data, this is just a list of
/// numbers with no mappings to edges.
ArrayRef<unsigned> getRawEdgeCounts() const { return EdgeCounts; }
};
/// createProfileMetadataLoaderPass - This function returns a Pass that loads
/// the profiling information for the module from the specified filename.
ModulePass *createProfileMetadataLoaderPass(const std::string &Filename);
} // End llvm namespace
#endif
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