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must be called in the pass's constructor. This function uses static dependency declarations to recursively initialize the pass's dependencies. Clients that only create passes through the createFooPass() APIs will require no changes. Clients that want to use the CommandLine options for passes will need to manually call the appropriate initialization functions in PassInitialization.h before parsing commandline arguments. I have tested this with all standard configurations of clang and llvm-gcc on Darwin. It is possible that there are problems with the static dependencies that will only be visible with non-standard options. If you encounter any crash in pass registration/creation, please send the testcase to me directly. llvm-svn: 116820
383 lines
13 KiB
C++
383 lines
13 KiB
C++
//===- ProfileVerifierPass.cpp - LLVM Pass to estimate profile info -------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements a pass that checks profiling information for
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// plausibility.
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//
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//===----------------------------------------------------------------------===//
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#define DEBUG_TYPE "profile-verifier"
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#include "llvm/Instructions.h"
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#include "llvm/Module.h"
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#include "llvm/Pass.h"
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#include "llvm/Analysis/ProfileInfo.h"
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#include "llvm/Support/CommandLine.h"
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#include "llvm/Support/CallSite.h"
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#include "llvm/Support/CFG.h"
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#include "llvm/Support/InstIterator.h"
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#include "llvm/Support/raw_ostream.h"
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#include "llvm/Support/Format.h"
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#include "llvm/Support/Debug.h"
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#include <set>
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using namespace llvm;
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static cl::opt<bool,false>
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ProfileVerifierDisableAssertions("profile-verifier-noassert",
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cl::desc("Disable assertions"));
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namespace llvm {
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template<class FType, class BType>
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class ProfileVerifierPassT : public FunctionPass {
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struct DetailedBlockInfo {
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const BType *BB;
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double BBWeight;
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double inWeight;
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int inCount;
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double outWeight;
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int outCount;
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};
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ProfileInfoT<FType, BType> *PI;
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std::set<const BType*> BBisVisited;
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std::set<const FType*> FisVisited;
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bool DisableAssertions;
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// When debugging is enabled, the verifier prints a whole slew of debug
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// information, otherwise its just the assert. These are all the helper
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// functions.
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bool PrintedDebugTree;
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std::set<const BType*> BBisPrinted;
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void debugEntry(DetailedBlockInfo*);
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void printDebugInfo(const BType *BB);
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public:
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static char ID; // Class identification, replacement for typeinfo
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explicit ProfileVerifierPassT () : FunctionPass(ID) {
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initializeProfileVerifierPassPass(*PassRegistry::getPassRegistry());
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DisableAssertions = ProfileVerifierDisableAssertions;
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}
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explicit ProfileVerifierPassT (bool da) : FunctionPass(ID),
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DisableAssertions(da) {
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initializeProfileVerifierPassPass(*PassRegistry::getPassRegistry());
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}
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void getAnalysisUsage(AnalysisUsage &AU) const {
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AU.setPreservesAll();
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AU.addRequired<ProfileInfoT<FType, BType> >();
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}
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const char *getPassName() const {
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return "Profiling information verifier";
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}
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/// run - Verify the profile information.
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bool runOnFunction(FType &F);
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void recurseBasicBlock(const BType*);
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bool exitReachable(const FType*);
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double ReadOrAssert(typename ProfileInfoT<FType, BType>::Edge);
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void CheckValue(bool, const char*, DetailedBlockInfo*);
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};
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typedef ProfileVerifierPassT<Function, BasicBlock> ProfileVerifierPass;
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template<class FType, class BType>
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void ProfileVerifierPassT<FType, BType>::printDebugInfo(const BType *BB) {
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if (BBisPrinted.find(BB) != BBisPrinted.end()) return;
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double BBWeight = PI->getExecutionCount(BB);
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if (BBWeight == ProfileInfoT<FType, BType>::MissingValue) { BBWeight = 0; }
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double inWeight = 0;
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int inCount = 0;
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std::set<const BType*> ProcessedPreds;
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for (const_pred_iterator bbi = pred_begin(BB), bbe = pred_end(BB);
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bbi != bbe; ++bbi ) {
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if (ProcessedPreds.insert(*bbi).second) {
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typename ProfileInfoT<FType, BType>::Edge E = PI->getEdge(*bbi,BB);
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double EdgeWeight = PI->getEdgeWeight(E);
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if (EdgeWeight == ProfileInfoT<FType, BType>::MissingValue) { EdgeWeight = 0; }
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dbgs() << "calculated in-edge " << E << ": "
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<< format("%20.20g",EdgeWeight) << "\n";
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inWeight += EdgeWeight;
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inCount++;
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}
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}
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double outWeight = 0;
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int outCount = 0;
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std::set<const BType*> ProcessedSuccs;
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for ( succ_const_iterator bbi = succ_begin(BB), bbe = succ_end(BB);
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bbi != bbe; ++bbi ) {
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if (ProcessedSuccs.insert(*bbi).second) {
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typename ProfileInfoT<FType, BType>::Edge E = PI->getEdge(BB,*bbi);
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double EdgeWeight = PI->getEdgeWeight(E);
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if (EdgeWeight == ProfileInfoT<FType, BType>::MissingValue) { EdgeWeight = 0; }
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dbgs() << "calculated out-edge " << E << ": "
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<< format("%20.20g",EdgeWeight) << "\n";
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outWeight += EdgeWeight;
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outCount++;
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}
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}
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dbgs() << "Block " << BB->getNameStr() << " in "
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<< BB->getParent()->getNameStr() << ":"
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<< "BBWeight=" << format("%20.20g",BBWeight) << ","
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<< "inWeight=" << format("%20.20g",inWeight) << ","
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<< "inCount=" << inCount << ","
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<< "outWeight=" << format("%20.20g",outWeight) << ","
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<< "outCount" << outCount << "\n";
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// mark as visited and recurse into subnodes
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BBisPrinted.insert(BB);
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for ( succ_const_iterator bbi = succ_begin(BB), bbe = succ_end(BB);
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bbi != bbe; ++bbi ) {
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printDebugInfo(*bbi);
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}
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}
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template<class FType, class BType>
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void ProfileVerifierPassT<FType, BType>::debugEntry (DetailedBlockInfo *DI) {
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dbgs() << "TROUBLE: Block " << DI->BB->getNameStr() << " in "
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<< DI->BB->getParent()->getNameStr() << ":"
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<< "BBWeight=" << format("%20.20g",DI->BBWeight) << ","
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<< "inWeight=" << format("%20.20g",DI->inWeight) << ","
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<< "inCount=" << DI->inCount << ","
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<< "outWeight=" << format("%20.20g",DI->outWeight) << ","
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<< "outCount=" << DI->outCount << "\n";
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if (!PrintedDebugTree) {
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PrintedDebugTree = true;
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printDebugInfo(&(DI->BB->getParent()->getEntryBlock()));
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}
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}
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// This compares A and B for equality.
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static bool Equals(double A, double B) {
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return A == B;
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}
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// This checks if the function "exit" is reachable from an given function
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// via calls, this is necessary to check if a profile is valid despite the
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// counts not fitting exactly.
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template<class FType, class BType>
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bool ProfileVerifierPassT<FType, BType>::exitReachable(const FType *F) {
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if (!F) return false;
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if (FisVisited.count(F)) return false;
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FType *Exit = F->getParent()->getFunction("exit");
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if (Exit == F) {
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return true;
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}
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FisVisited.insert(F);
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bool exits = false;
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for (const_inst_iterator I = inst_begin(F), E = inst_end(F); I != E; ++I) {
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if (const CallInst *CI = dyn_cast<CallInst>(&*I)) {
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FType *F = CI->getCalledFunction();
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if (F) {
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exits |= exitReachable(F);
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} else {
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// This is a call to a pointer, all bets are off...
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exits = true;
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}
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if (exits) break;
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}
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}
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return exits;
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}
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#define ASSERTMESSAGE(M) \
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{ dbgs() << "ASSERT:" << (M) << "\n"; \
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if (!DisableAssertions) assert(0 && (M)); }
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template<class FType, class BType>
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double ProfileVerifierPassT<FType, BType>::ReadOrAssert(typename ProfileInfoT<FType, BType>::Edge E) {
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double EdgeWeight = PI->getEdgeWeight(E);
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if (EdgeWeight == ProfileInfoT<FType, BType>::MissingValue) {
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dbgs() << "Edge " << E << " in Function "
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<< ProfileInfoT<FType, BType>::getFunction(E)->getNameStr() << ": ";
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ASSERTMESSAGE("Edge has missing value");
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return 0;
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} else {
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if (EdgeWeight < 0) {
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dbgs() << "Edge " << E << " in Function "
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<< ProfileInfoT<FType, BType>::getFunction(E)->getNameStr() << ": ";
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ASSERTMESSAGE("Edge has negative value");
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}
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return EdgeWeight;
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}
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}
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template<class FType, class BType>
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void ProfileVerifierPassT<FType, BType>::CheckValue(bool Error,
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const char *Message,
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DetailedBlockInfo *DI) {
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if (Error) {
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DEBUG(debugEntry(DI));
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dbgs() << "Block " << DI->BB->getNameStr() << " in Function "
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<< DI->BB->getParent()->getNameStr() << ": ";
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ASSERTMESSAGE(Message);
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}
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return;
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}
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// This calculates the Information for a block and then recurses into the
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// successors.
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template<class FType, class BType>
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void ProfileVerifierPassT<FType, BType>::recurseBasicBlock(const BType *BB) {
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// Break the recursion by remembering all visited blocks.
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if (BBisVisited.find(BB) != BBisVisited.end()) return;
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// Use a data structure to store all the information, this can then be handed
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// to debug printers.
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DetailedBlockInfo DI;
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DI.BB = BB;
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DI.outCount = DI.inCount = 0;
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DI.inWeight = DI.outWeight = 0;
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// Read predecessors.
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std::set<const BType*> ProcessedPreds;
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const_pred_iterator bpi = pred_begin(BB), bpe = pred_end(BB);
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// If there are none, check for (0,BB) edge.
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if (bpi == bpe) {
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DI.inWeight += ReadOrAssert(PI->getEdge(0,BB));
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DI.inCount++;
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}
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for (;bpi != bpe; ++bpi) {
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if (ProcessedPreds.insert(*bpi).second) {
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DI.inWeight += ReadOrAssert(PI->getEdge(*bpi,BB));
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DI.inCount++;
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}
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}
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// Read successors.
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std::set<const BType*> ProcessedSuccs;
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succ_const_iterator bbi = succ_begin(BB), bbe = succ_end(BB);
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// If there is an (0,BB) edge, consider it too. (This is done not only when
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// there are no successors, but every time; not every function contains
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// return blocks with no successors (think loop latch as return block)).
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double w = PI->getEdgeWeight(PI->getEdge(BB,0));
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if (w != ProfileInfoT<FType, BType>::MissingValue) {
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DI.outWeight += w;
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DI.outCount++;
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}
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for (;bbi != bbe; ++bbi) {
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if (ProcessedSuccs.insert(*bbi).second) {
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DI.outWeight += ReadOrAssert(PI->getEdge(BB,*bbi));
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DI.outCount++;
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}
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}
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// Read block weight.
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DI.BBWeight = PI->getExecutionCount(BB);
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CheckValue(DI.BBWeight == ProfileInfoT<FType, BType>::MissingValue,
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"BasicBlock has missing value", &DI);
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CheckValue(DI.BBWeight < 0,
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"BasicBlock has negative value", &DI);
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// Check if this block is a setjmp target.
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bool isSetJmpTarget = false;
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if (DI.outWeight > DI.inWeight) {
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for (typename BType::const_iterator i = BB->begin(), ie = BB->end();
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i != ie; ++i) {
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if (const CallInst *CI = dyn_cast<CallInst>(&*i)) {
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FType *F = CI->getCalledFunction();
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if (F && (F->getName() == "_setjmp")) {
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isSetJmpTarget = true; break;
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}
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}
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}
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}
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// Check if this block is eventually reaching exit.
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bool isExitReachable = false;
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if (DI.inWeight > DI.outWeight) {
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for (typename BType::const_iterator i = BB->begin(), ie = BB->end();
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i != ie; ++i) {
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if (const CallInst *CI = dyn_cast<CallInst>(&*i)) {
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FType *F = CI->getCalledFunction();
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if (F) {
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FisVisited.clear();
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isExitReachable |= exitReachable(F);
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} else {
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// This is a call to a pointer, all bets are off...
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isExitReachable = true;
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}
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if (isExitReachable) break;
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}
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}
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}
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if (DI.inCount > 0 && DI.outCount == 0) {
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// If this is a block with no successors.
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if (!isSetJmpTarget) {
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CheckValue(!Equals(DI.inWeight,DI.BBWeight),
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"inWeight and BBWeight do not match", &DI);
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}
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} else if (DI.inCount == 0 && DI.outCount > 0) {
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// If this is a block with no predecessors.
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if (!isExitReachable)
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CheckValue(!Equals(DI.BBWeight,DI.outWeight),
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"BBWeight and outWeight do not match", &DI);
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} else {
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// If this block has successors and predecessors.
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if (DI.inWeight > DI.outWeight && !isExitReachable)
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CheckValue(!Equals(DI.inWeight,DI.outWeight),
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"inWeight and outWeight do not match", &DI);
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if (DI.inWeight < DI.outWeight && !isSetJmpTarget)
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CheckValue(!Equals(DI.inWeight,DI.outWeight),
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"inWeight and outWeight do not match", &DI);
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}
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// Mark this block as visited, rescurse into successors.
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BBisVisited.insert(BB);
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for ( succ_const_iterator bbi = succ_begin(BB), bbe = succ_end(BB);
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bbi != bbe; ++bbi ) {
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recurseBasicBlock(*bbi);
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}
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}
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template<class FType, class BType>
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bool ProfileVerifierPassT<FType, BType>::runOnFunction(FType &F) {
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PI = getAnalysisIfAvailable<ProfileInfoT<FType, BType> >();
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if (!PI)
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ASSERTMESSAGE("No ProfileInfo available");
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// Prepare global variables.
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PrintedDebugTree = false;
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BBisVisited.clear();
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// Fetch entry block and recurse into it.
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const BType *entry = &F.getEntryBlock();
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recurseBasicBlock(entry);
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if (PI->getExecutionCount(&F) != PI->getExecutionCount(entry))
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ASSERTMESSAGE("Function count and entry block count do not match");
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return false;
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}
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template<class FType, class BType>
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char ProfileVerifierPassT<FType, BType>::ID = 0;
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}
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INITIALIZE_PASS_BEGIN(ProfileVerifierPass, "profile-verifier",
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"Verify profiling information", false, true)
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INITIALIZE_AG_DEPENDENCY(ProfileInfo)
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INITIALIZE_PASS_END(ProfileVerifierPass, "profile-verifier",
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"Verify profiling information", false, true)
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namespace llvm {
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FunctionPass *createProfileVerifierPass() {
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return new ProfileVerifierPass(ProfileVerifierDisableAssertions);
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}
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}
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