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257 lines
8.8 KiB
C++
257 lines
8.8 KiB
C++
//===- Pass.cpp - LLVM Pass Infrastructure Impementation ------------------===//
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//
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// This file implements the LLVM Pass infrastructure. It is primarily
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// responsible with ensuring that passes are executed and batched together
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// optimally.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/PassManager.h"
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#include "PassManagerT.h" // PassManagerT implementation
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#include "llvm/Module.h"
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#include "llvm/Function.h"
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#include "llvm/BasicBlock.h"
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#include "Support/STLExtras.h"
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#include "Support/CommandLine.h"
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#include <typeinfo>
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#include <iostream>
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#include <sys/time.h>
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#include <stdio.h>
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// Source of unique analysis ID #'s.
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unsigned AnalysisID::NextID = 0;
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void AnalysisResolver::setAnalysisResolver(Pass *P, AnalysisResolver *AR) {
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assert(P->Resolver == 0 && "Pass already in a PassManager!");
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P->Resolver = AR;
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}
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// preservesCFG - This function should be called to by the pass, iff they do
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// not:
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//
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// 1. Add or remove basic blocks from the function
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// 2. Modify terminator instructions in any way.
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//
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// This function annotates the AnalysisUsage info object to say that analyses
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// that only depend on the CFG are preserved by this pass.
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//
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void AnalysisUsage::preservesCFG() {
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// FIXME: implement preservesCFG
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}
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//===----------------------------------------------------------------------===//
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// PassManager implementation - The PassManager class is a simple Pimpl class
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// that wraps the PassManagerT template.
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//
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PassManager::PassManager() : PM(new PassManagerT<Module>()) {}
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PassManager::~PassManager() { delete PM; }
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void PassManager::add(Pass *P) { PM->add(P); }
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bool PassManager::run(Module *M) { return PM->run(M); }
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//===----------------------------------------------------------------------===//
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// TimingInfo Class - This class is used to calculate information about the
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// amount of time each pass takes to execute. This only happens with
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// -time-passes is enabled on the command line.
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//
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static cl::Flag EnableTiming("time-passes", "Time each pass, printing elapsed"
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" time for each on exit");
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static double getTime() {
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struct timeval T;
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gettimeofday(&T, 0);
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return T.tv_sec + T.tv_usec/1000000.0;
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}
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// Create method. If Timing is enabled, this creates and returns a new timing
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// object, otherwise it returns null.
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//
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TimingInfo *TimingInfo::create() {
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return EnableTiming ? new TimingInfo() : 0;
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}
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void TimingInfo::passStarted(Pass *P) { TimingData[P] -= getTime(); }
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void TimingInfo::passEnded(Pass *P) { TimingData[P] += getTime(); }
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// TimingDtor - Print out information about timing information
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TimingInfo::~TimingInfo() {
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// Iterate over all of the data, converting it into the dual of the data map,
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// so that the data is sorted by amount of time taken, instead of pointer.
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//
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std::vector<pair<double, Pass*> > Data;
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double TotalTime = 0;
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for (std::map<Pass*, double>::iterator I = TimingData.begin(),
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E = TimingData.end(); I != E; ++I)
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// Throw out results for "grouping" pass managers...
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if (!dynamic_cast<AnalysisResolver*>(I->first)) {
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Data.push_back(std::make_pair(I->second, I->first));
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TotalTime += I->second;
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}
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// Sort the data by time as the primary key, in reverse order...
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std::sort(Data.begin(), Data.end(), greater<pair<double, Pass*> >());
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// Print out timing header...
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cerr << std::string(79, '=') << "\n"
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<< " ... Pass execution timing report ...\n"
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<< std::string(79, '=') << "\n Total Execution Time: " << TotalTime
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<< " seconds\n\n % Time: Seconds:\tPass Name:\n";
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// Loop through all of the timing data, printing it out...
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for (unsigned i = 0, e = Data.size(); i != e; ++i) {
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fprintf(stderr, " %6.2f%% %fs\t%s\n", Data[i].first*100 / TotalTime,
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Data[i].first, Data[i].second->getPassName());
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}
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cerr << " 100.00% " << TotalTime << "s\tTOTAL\n"
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<< std::string(79, '=') << "\n";
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}
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//===----------------------------------------------------------------------===//
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// Pass debugging information. Often it is useful to find out what pass is
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// running when a crash occurs in a utility. When this library is compiled with
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// debugging on, a command line option (--debug-pass) is enabled that causes the
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// pass name to be printed before it executes.
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//
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// Different debug levels that can be enabled...
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enum PassDebugLevel {
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None, PassStructure, PassExecutions, PassDetails
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};
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static cl::Enum<enum PassDebugLevel> PassDebugging("debug-pass", cl::Hidden,
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"Print PassManager debugging information",
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clEnumVal(None , "disable debug output"),
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clEnumVal(PassStructure , "print pass structure before run()"),
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clEnumVal(PassExecutions, "print pass name before it is executed"),
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clEnumVal(PassDetails , "print pass details when it is executed"), 0);
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void PMDebug::PrintPassStructure(Pass *P) {
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if (PassDebugging >= PassStructure)
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P->dumpPassStructure();
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}
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void PMDebug::PrintPassInformation(unsigned Depth, const char *Action,
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Pass *P, Annotable *V) {
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if (PassDebugging >= PassExecutions) {
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std::cerr << (void*)P << std::string(Depth*2+1, ' ') << Action << " '"
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<< P->getPassName();
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if (V) {
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std::cerr << "' on ";
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if (dynamic_cast<Module*>(V)) {
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std::cerr << "Module\n"; return;
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} else if (Function *F = dynamic_cast<Function*>(V))
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std::cerr << "Function '" << F->getName();
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else if (BasicBlock *BB = dynamic_cast<BasicBlock*>(V))
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std::cerr << "BasicBlock '" << BB->getName();
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else if (Value *Val = dynamic_cast<Value*>(V))
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std::cerr << typeid(*Val).name() << " '" << Val->getName();
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}
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std::cerr << "'...\n";
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}
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}
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void PMDebug::PrintAnalysisSetInfo(unsigned Depth, const char *Msg,
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Pass *P, const std::vector<AnalysisID> &Set){
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if (PassDebugging >= PassDetails && !Set.empty()) {
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std::cerr << (void*)P << std::string(Depth*2+3, ' ') << Msg << " Analyses:";
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for (unsigned i = 0; i != Set.size(); ++i) {
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Pass *P = Set[i].createPass(); // Good thing this is just debug code...
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std::cerr << " " << P->getPassName();
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delete P;
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}
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std::cerr << "\n";
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}
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}
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// dumpPassStructure - Implement the -debug-passes=PassStructure option
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void Pass::dumpPassStructure(unsigned Offset = 0) {
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std::cerr << std::string(Offset*2, ' ') << getPassName() << "\n";
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}
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//===----------------------------------------------------------------------===//
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// Pass Implementation
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//
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void Pass::addToPassManager(PassManagerT<Module> *PM, AnalysisUsage &AU) {
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PM->addPass(this, AU);
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}
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// getPassName - Use C++ RTTI to get a SOMEWHAT intelligable name for the pass.
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//
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const char *Pass::getPassName() const { return typeid(*this).name(); }
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//===----------------------------------------------------------------------===//
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// FunctionPass Implementation
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//
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// run - On a module, we run this pass by initializing, runOnFunction'ing once
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// for every function in the module, then by finalizing.
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//
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bool FunctionPass::run(Module *M) {
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bool Changed = doInitialization(M);
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for (Module::iterator I = M->begin(), E = M->end(); I != E; ++I)
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if (!(*I)->isExternal()) // Passes are not run on external functions!
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Changed |= runOnFunction(*I);
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return Changed | doFinalization(M);
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}
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// run - On a function, we simply initialize, run the function, then finalize.
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//
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bool FunctionPass::run(Function *F) {
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if (F->isExternal()) return false;// Passes are not run on external functions!
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return doInitialization(F->getParent()) | runOnFunction(F)
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| doFinalization(F->getParent());
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}
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void FunctionPass::addToPassManager(PassManagerT<Module> *PM,
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AnalysisUsage &AU) {
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PM->addPass(this, AU);
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}
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void FunctionPass::addToPassManager(PassManagerT<Function> *PM,
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AnalysisUsage &AU) {
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PM->addPass(this, AU);
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}
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//===----------------------------------------------------------------------===//
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// BasicBlockPass Implementation
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//
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// To run this pass on a function, we simply call runOnBasicBlock once for each
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// function.
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//
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bool BasicBlockPass::runOnFunction(Function *F) {
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bool Changed = false;
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for (Function::iterator I = F->begin(), E = F->end(); I != E; ++I)
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Changed |= runOnBasicBlock(*I);
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return Changed;
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}
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// To run directly on the basic block, we initialize, runOnBasicBlock, then
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// finalize.
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//
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bool BasicBlockPass::run(BasicBlock *BB) {
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Module *M = BB->getParent()->getParent();
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return doInitialization(M) | runOnBasicBlock(BB) | doFinalization(M);
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}
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void BasicBlockPass::addToPassManager(PassManagerT<Function> *PM,
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AnalysisUsage &AU) {
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PM->addPass(this, AU);
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}
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void BasicBlockPass::addToPassManager(PassManagerT<BasicBlock> *PM,
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AnalysisUsage &AU) {
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PM->addPass(this, AU);
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}
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