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Diffstat (limited to 'lib/Transforms/Instrumentation/ProfilePaths/InstLoops.cpp')
| -rw-r--r-- | lib/Transforms/Instrumentation/ProfilePaths/InstLoops.cpp | 185 |
1 files changed, 0 insertions, 185 deletions
diff --git a/lib/Transforms/Instrumentation/ProfilePaths/InstLoops.cpp b/lib/Transforms/Instrumentation/ProfilePaths/InstLoops.cpp deleted file mode 100644 index 020388f2b6..0000000000 --- a/lib/Transforms/Instrumentation/ProfilePaths/InstLoops.cpp +++ /dev/null @@ -1,185 +0,0 @@ -//===-- InstLoops.cpp -----------------------------------------------------===// -// -// 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 is the first-level instrumentation pass for the Reoptimizer. It -// instrument the back-edges of loops by inserting a basic block -// containing a call to llvm_first_trigger (the first-level trigger function), -// and inserts an initialization call to the main() function. -// -//===----------------------------------------------------------------------===// - -#include "llvm/Analysis/Dominators.h" -#include "llvm/Support/CFG.h" -#include "llvm/Instructions.h" -#include "llvm/Module.h" -#include "llvm/Pass.h" -#include "llvm/Type.h" -#include "llvm/Support/Debug.h" -#include "llvm/Transforms/Instrumentation.h" -#include "../ProfilingUtils.h" - -namespace llvm { - -//this is used to color vertices -//during DFS - -enum Color{ - WHITE, - GREY, - BLACK -}; - -namespace { - typedef std::map<BasicBlock *, BasicBlock *> BBMap; - struct InstLoops : public FunctionPass { - virtual void getAnalysisUsage(AnalysisUsage &AU) const { - AU.addRequired<DominatorSet>(); - } - private: - Function *inCountMth; - DominatorSet *DS; - void getBackEdgesVisit(BasicBlock *u, - std::map<BasicBlock *, Color > &color, - std::map<BasicBlock *, int > &d, - int &time, BBMap &be); - void removeRedundant(BBMap &be); - void findAndInstrumentBackEdges(Function &F); - public: - bool doInitialization(Module &M); - bool runOnFunction(Function &F); - }; - - RegisterOpt<InstLoops> X("instloops", "Instrument backedges for profiling"); -} - -//helper function to get back edges: it is called by -//the "getBackEdges" function below -void InstLoops::getBackEdgesVisit(BasicBlock *u, - std::map<BasicBlock *, Color > &color, - std::map<BasicBlock *, int > &d, - int &time, BBMap &be) { - color[u]=GREY; - time++; - d[u]=time; - - for(succ_iterator vl = succ_begin(u), ve = succ_end(u); vl != ve; ++vl){ - BasicBlock *BB = *vl; - - if(color[BB]!=GREY && color[BB]!=BLACK){ - getBackEdgesVisit(BB, color, d, time, be); - } - - //now checking for d and f vals - else if(color[BB]==GREY){ - //so v is ancestor of u if time of u > time of v - if(d[u] >= d[BB]){ - //u->BB is a backedge - be[u] = BB; - } - } - } - color[u]=BLACK;//done with visiting the node and its neighbors -} - -//look at all BEs, and remove all BEs that are dominated by other BE's in the -//set -void InstLoops::removeRedundant(BBMap &be) { - std::vector<BasicBlock *> toDelete; - for(std::map<BasicBlock *, BasicBlock *>::iterator MI = be.begin(), - ME = be.end(); MI != ME; ++MI) - for(BBMap::iterator MMI = be.begin(), MME = be.end(); MMI != MME; ++MMI) - if(DS->properlyDominates(MI->first, MMI->first)) - toDelete.push_back(MMI->first); - // Remove all the back-edges we found from be. - for(std::vector<BasicBlock *>::iterator VI = toDelete.begin(), - VE = toDelete.end(); VI != VE; ++VI) - be.erase(*VI); -} - -//getting the backedges in a graph -//Its a variation of DFS to get the backedges in the graph -//We get back edges by associating a time -//and a color with each vertex. -//The time of a vertex is the time when it was first visited -//The color of a vertex is initially WHITE, -//Changes to GREY when it is first visited, -//and changes to BLACK when ALL its neighbors -//have been visited -//So we have a back edge when we meet a successor of -//a node with smaller time, and GREY color -void InstLoops::findAndInstrumentBackEdges(Function &F){ - std::map<BasicBlock *, Color > color; - std::map<BasicBlock *, int> d; - BBMap be; - int time=0; - getBackEdgesVisit(F.begin(), color, d, time, be); - - removeRedundant(be); - - for(std::map<BasicBlock *, BasicBlock *>::iterator MI = be.begin(), - ME = be.end(); MI != ME; ++MI){ - BasicBlock *u = MI->first; - BasicBlock *BB = MI->second; - // We have a back-edge from BB --> u. - DEBUG (std::cerr << "Instrumenting back-edge from " << BB->getName () - << "-->" << u->getName () << "\n"); - // Split the back-edge, inserting a new basic block on it, and modify the - // source BB's terminator accordingly. - BasicBlock *newBB = new BasicBlock("backEdgeInst", u->getParent()); - BranchInst *ti = cast<BranchInst>(u->getTerminator()); - unsigned char index = ((ti->getSuccessor(0) == BB) ? 0 : 1); - - assert(ti->getNumSuccessors() > index && "Not enough successors!"); - ti->setSuccessor(index, newBB); - - BasicBlock::InstListType < = newBB->getInstList(); - lt.push_back(new CallInst(inCountMth)); - new BranchInst(BB, newBB); - - // Now, set the sources of Phi nodes corresponding to the back-edge - // in BB to come from the instrumentation block instead. - for(BasicBlock::iterator BB2Inst = BB->begin(), BBend = BB->end(); - BB2Inst != BBend; ++BB2Inst) { - if (PHINode *phiInst = dyn_cast<PHINode>(BB2Inst)) { - int bbIndex = phiInst->getBasicBlockIndex(u); - if (bbIndex>=0) - phiInst->setIncomingBlock(bbIndex, newBB); - } - } - } -} - -bool InstLoops::doInitialization (Module &M) { - inCountMth = M.getOrInsertFunction("llvm_first_trigger", Type::VoidTy, - (Type *)0); - return true; // Module was modified. -} - -/// runOnFunction - Entry point for FunctionPass that inserts calls to -/// trigger function. -/// -bool InstLoops::runOnFunction(Function &F){ - if (F.isExternal ()) - return false; - - DS = &getAnalysis<DominatorSet> (); - - // Add a call to reoptimizerInitialize() to beginning of function named main. - if (F.getName() == "main") - InsertProfilingInitCall (&F, "reoptimizerInitialize"); - - findAndInstrumentBackEdges(F); - return true; // Function was modified. -} - -FunctionPass *createLoopInstrumentationPass () { - return new InstLoops(); -} - -} // End llvm namespace |