forked from OSchip/llvm-project
119 lines
3.9 KiB
C++
119 lines
3.9 KiB
C++
//===- llvm/IR/OptBisect/Bisect.cpp - LLVM Bisect support -----------------===//
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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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/// \file
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/// This file implements support for a bisecting optimizations based on a
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/// command line option.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/IR/OptBisect.h"
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#include "llvm/ADT/StringRef.h"
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#include "llvm/Analysis/CallGraph.h"
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#include "llvm/Analysis/CallGraphSCCPass.h"
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#include "llvm/Analysis/LoopInfo.h"
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#include "llvm/Analysis/RegionInfo.h"
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#include "llvm/IR/BasicBlock.h"
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#include "llvm/IR/Function.h"
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#include "llvm/IR/Module.h"
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#include "llvm/Pass.h"
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#include "llvm/Support/CommandLine.h"
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#include "llvm/Support/raw_ostream.h"
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#include <cassert>
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#include <limits>
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#include <string>
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using namespace llvm;
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static cl::opt<int> OptBisectLimit("opt-bisect-limit", cl::Hidden,
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cl::init(std::numeric_limits<int>::max()),
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cl::Optional,
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cl::desc("Maximum optimization to perform"));
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OptBisect::OptBisect() {
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BisectEnabled = OptBisectLimit != std::numeric_limits<int>::max();
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}
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static void printPassMessage(const StringRef &Name, int PassNum,
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StringRef TargetDesc, bool Running) {
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StringRef Status = Running ? "" : "NOT ";
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errs() << "BISECT: " << Status << "running pass "
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<< "(" << PassNum << ") " << Name << " on " << TargetDesc << "\n";
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}
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static std::string getDescription(const Module &M) {
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return "module (" + M.getName().str() + ")";
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}
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static std::string getDescription(const Function &F) {
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return "function (" + F.getName().str() + ")";
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}
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static std::string getDescription(const BasicBlock &BB) {
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return "basic block (" + BB.getName().str() + ") in function (" +
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BB.getParent()->getName().str() + ")";
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}
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static std::string getDescription(const Loop &L) {
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// FIXME: Move into LoopInfo so we can get a better description
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// (and avoid a circular dependency between IR and Analysis).
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return "loop";
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}
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static std::string getDescription(const Region &R) {
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// FIXME: Move into RegionInfo so we can get a better description
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// (and avoid a circular dependency between IR and Analysis).
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return "region";
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}
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static std::string getDescription(const CallGraphSCC &SCC) {
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// FIXME: Move into CallGraphSCCPass to avoid circular dependency between
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// IR and Analysis.
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std::string Desc = "SCC (";
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bool First = true;
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for (CallGraphNode *CGN : SCC) {
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if (First)
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First = false;
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else
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Desc += ", ";
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Function *F = CGN->getFunction();
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if (F)
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Desc += F->getName();
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else
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Desc += "<<null function>>";
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}
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Desc += ")";
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return Desc;
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}
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// Force instantiations.
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template bool OptBisect::shouldRunPass(const Pass *, const Module &);
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template bool OptBisect::shouldRunPass(const Pass *, const Function &);
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template bool OptBisect::shouldRunPass(const Pass *, const BasicBlock &);
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template bool OptBisect::shouldRunPass(const Pass *, const Loop &);
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template bool OptBisect::shouldRunPass(const Pass *, const CallGraphSCC &);
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template bool OptBisect::shouldRunPass(const Pass *, const Region &);
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template <class UnitT>
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bool OptBisect::shouldRunPass(const Pass *P, const UnitT &U) {
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if (!BisectEnabled)
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return true;
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return checkPass(P->getPassName(), getDescription(U));
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}
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bool OptBisect::checkPass(const StringRef PassName,
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const StringRef TargetDesc) {
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assert(BisectEnabled);
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int CurBisectNum = ++LastBisectNum;
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bool ShouldRun = (OptBisectLimit == -1 || CurBisectNum <= OptBisectLimit);
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printPassMessage(PassName, CurBisectNum, TargetDesc, ShouldRun);
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return ShouldRun;
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}
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