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//===------- llvm/IR/OptBisect/Bisect.cpp - LLVM Bisect support --------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
///
/// \file
/// This file implements support for a bisecting optimizations based on a
/// command line option.
///
//===----------------------------------------------------------------------===//
#include "llvm/Analysis/CallGraphSCCPass.h"
#include "llvm/Analysis/LazyCallGraph.h"
#include "llvm/Analysis/LoopInfo.h"
#include "llvm/IR/Module.h"
#include "llvm/IR/OptBisect.h"
#include "llvm/Pass.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/raw_ostream.h"
using namespace llvm;
static cl::opt<int> OptBisectLimit("opt-bisect-limit", cl::Hidden,
cl::init(INT_MAX), cl::Optional,
cl::desc("Maximum optimization to perform"));
OptBisect::OptBisect() {
BisectEnabled = OptBisectLimit != INT_MAX;
}
static void printPassMessage(const StringRef &Name, int PassNum,
StringRef TargetDesc, bool Running) {
StringRef Status = Running ? "" : "NOT ";
errs() << "BISECT: " << Status << "running pass "
<< "(" << PassNum << ") " << Name << " on " << TargetDesc << "\n";
}
static void printCaseMessage(int CaseNum, StringRef Msg, bool Running) {
if (Running)
errs() << "BISECT: running case (";
else
errs() << "BISECT: NOT running case (";
errs() << CaseNum << "): " << Msg << "\n";
}
static std::string getDescription(const Module &M) {
return "module (" + M.getName().str() + ")";
}
static std::string getDescription(const Function &F) {
return "function (" + F.getName().str() + ")";
}
static std::string getDescription(const BasicBlock &BB) {
return "basic block (" + BB.getName().str() + ") in function (" +
BB.getParent()->getName().str() + ")";
}
static std::string getDescription(const Loop &L) {
// FIXME: I'd like to be able to provide a better description here, but
// calling L->getHeader() would introduce a new dependency on the
// LLVMCore library.
return "loop";
}
static std::string getDescription(const CallGraphSCC &SCC) {
std::string Desc = "SCC (";
bool First = true;
for (CallGraphNode *CGN : SCC) {
if (First)
First = false;
else
Desc += ", ";
Function *F = CGN->getFunction();
if (F)
Desc += F->getName();
else
Desc += "<<null function>>";
}
Desc += ")";
return Desc;
}
// Force instantiations.
template bool OptBisect::shouldRunPass(const Pass *, const Module &);
template bool OptBisect::shouldRunPass(const Pass *, const Function &);
template bool OptBisect::shouldRunPass(const Pass *, const BasicBlock &);
template bool OptBisect::shouldRunPass(const Pass *, const Loop &);
template bool OptBisect::shouldRunPass(const Pass *, const CallGraphSCC &);
template <class UnitT>
bool OptBisect::shouldRunPass(const Pass *P, const UnitT &U) {
if (!BisectEnabled)
return true;
return checkPass(P->getPassName(), getDescription(U));
}
bool OptBisect::checkPass(const StringRef PassName,
const StringRef TargetDesc) {
assert(BisectEnabled);
int CurBisectNum = ++LastBisectNum;
bool ShouldRun = (OptBisectLimit == -1 || CurBisectNum <= OptBisectLimit);
printPassMessage(PassName, CurBisectNum, TargetDesc, ShouldRun);
return ShouldRun;
}
bool OptBisect::shouldRunCase(const Twine &Msg) {
if (!BisectEnabled)
return true;
int CurFuelNum = ++LastBisectNum;
bool ShouldRun = (OptBisectLimit == -1 || CurFuelNum <= OptBisectLimit);
printCaseMessage(CurFuelNum, Msg.str(), ShouldRun);
return ShouldRun;
}
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