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Pass to compute various statisics related to DSGraphs.

For now, this just computes the #indirect call sites and
the avg. #callees per indirect call site (actually it prints
both totals and the average is their ratio).

llvm-svn: 4705
This commit is contained in:
Vikram S. Adve 2002-11-13 15:41:00 +00:00
parent 996bf14a4f
commit 2dfc11dc3b

View File

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//===- DSGraphStats.cpp - Various statistics for DS Graphs -----*- C++ -*--===//
//
//===----------------------------------------------------------------------===//
#include "llvm/Analysis/DataStructure.h"
#include "llvm/Analysis/DSGraph.h"
#include "llvm/Function.h"
#include "llvm/iOther.h"
#include "llvm/Pass.h"
#include "Support/Statistic.h"
#include <vector>
namespace {
Statistic<double> TotalNumCallees("totalcallees",
"Total number of callee functions at all indirect call sites");
Statistic<> NumIndirectCalls("numindirect",
"Total number of indirect call sites in the program");
Statistic<> NumPoolNodes("numpools",
"Number of allocation nodes that could be pool allocated");
class DSGraphStats: public FunctionPass {
void countCallees(const Function& F, const DSGraph& tdGraph);
public:
/// Driver functions to compute the Load/Store Dep. Graph per function.
bool runOnFunction(Function& F);
/// getAnalysisUsage - This modify nothing, and uses the Top-Down Graph.
void getAnalysisUsage(AnalysisUsage &AU) const {
AU.setPreservesAll();
AU.addRequired<TDDataStructures>();
}
/// Debugging support methods
void print(std::ostream &O) const { }
void dump() const;
};
static RegisterAnalysis<DSGraphStats> Z("dsstats", "DS Graph Statistics");
}
void DSGraphStats::countCallees(const Function& F,
const DSGraph& tdGraph)
{
unsigned numIndirectCalls = 0, totalNumCallees = 0;
const std::vector<DSCallSite>& callSites = tdGraph.getFunctionCalls();
for (unsigned i=0, N = callSites.size(); i < N; ++i)
if (callSites[i].getCallInst().getCalledFunction() == NULL)
{ // This is an indirect function call
std::vector<GlobalValue*> Callees =
callSites[i].getCallee().getNode()->getGlobals();
if (Callees.size() > 0)
{
totalNumCallees += Callees.size();
++numIndirectCalls;
}
#ifndef NDEBUG
else
std::cerr << "WARNING: No callee in Function " << F.getName()
<< "at call:\n" << callSites[i].getCallInst();
#endif
}
TotalNumCallees += totalNumCallees;
NumIndirectCalls += numIndirectCalls;
std::cout << " In function " << F.getName() << " : "
<< (double) (numIndirectCalls == 0? 0.0
: (totalNumCallees / (double) numIndirectCalls))
<< " avg. callees per indirect call\n";
}
bool DSGraphStats::runOnFunction(Function& F)
{
const DSGraph& tdGraph = getAnalysis<TDDataStructures>().getDSGraph(F);
countCallees(F, tdGraph);
return true;
}
void DSGraphStats::dump() const
{
this->print(std::cerr);
}