llvm/lib/Analysis/BlockFrequencyInfo.cpp
Mehdi Amini 3ffe113e11 Turn cl::values() (for enum) from a vararg function to using C++ variadic template
The core of the change is supposed to be NFC, however it also fixes
what I believe was an undefined behavior when calling:

 va_start(ValueArgs, Desc);

with Desc being a StringRef.

Differential Revision: https://reviews.llvm.org/D25342

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@283671 91177308-0d34-0410-b5e6-96231b3b80d8
2016-10-08 19:41:06 +00:00

272 lines
9.2 KiB
C++

//===- BlockFrequencyInfo.cpp - Block Frequency Analysis ------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// Loops should be simplified before this analysis.
//
//===----------------------------------------------------------------------===//
#include "llvm/Analysis/BlockFrequencyInfo.h"
#include "llvm/Analysis/BlockFrequencyInfoImpl.h"
#include "llvm/Analysis/BranchProbabilityInfo.h"
#include "llvm/Analysis/LoopInfo.h"
#include "llvm/Analysis/Passes.h"
#include "llvm/IR/CFG.h"
#include "llvm/InitializePasses.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/GraphWriter.h"
using namespace llvm;
#define DEBUG_TYPE "block-freq"
#ifndef NDEBUG
static cl::opt<GVDAGType> ViewBlockFreqPropagationDAG(
"view-block-freq-propagation-dags", cl::Hidden,
cl::desc("Pop up a window to show a dag displaying how block "
"frequencies propagation through the CFG."),
cl::values(clEnumValN(GVDT_None, "none", "do not display graphs."),
clEnumValN(GVDT_Fraction, "fraction",
"display a graph using the "
"fractional block frequency representation."),
clEnumValN(GVDT_Integer, "integer",
"display a graph using the raw "
"integer fractional block frequency representation."),
clEnumValN(GVDT_Count, "count", "display a graph using the real "
"profile count if available.")));
cl::opt<std::string>
ViewBlockFreqFuncName("view-bfi-func-name", cl::Hidden,
cl::desc("The option to specify "
"the name of the function "
"whose CFG will be displayed."));
cl::opt<unsigned>
ViewHotFreqPercent("view-hot-freq-percent", cl::init(10), cl::Hidden,
cl::desc("An integer in percent used to specify "
"the hot blocks/edges to be displayed "
"in red: a block or edge whose frequency "
"is no less than the max frequency of the "
"function multiplied by this percent."));
namespace llvm {
template <>
struct GraphTraits<BlockFrequencyInfo *> {
typedef const BasicBlock *NodeRef;
typedef succ_const_iterator ChildIteratorType;
typedef pointer_iterator<Function::const_iterator> nodes_iterator;
static NodeRef getEntryNode(const BlockFrequencyInfo *G) {
return &G->getFunction()->front();
}
static ChildIteratorType child_begin(const NodeRef N) {
return succ_begin(N);
}
static ChildIteratorType child_end(const NodeRef N) { return succ_end(N); }
static nodes_iterator nodes_begin(const BlockFrequencyInfo *G) {
return nodes_iterator(G->getFunction()->begin());
}
static nodes_iterator nodes_end(const BlockFrequencyInfo *G) {
return nodes_iterator(G->getFunction()->end());
}
};
typedef BFIDOTGraphTraitsBase<BlockFrequencyInfo, BranchProbabilityInfo>
BFIDOTGTraitsBase;
template <>
struct DOTGraphTraits<BlockFrequencyInfo *> : public BFIDOTGTraitsBase {
explicit DOTGraphTraits(bool isSimple = false)
: BFIDOTGTraitsBase(isSimple) {}
std::string getNodeLabel(const BasicBlock *Node,
const BlockFrequencyInfo *Graph) {
return BFIDOTGTraitsBase::getNodeLabel(Node, Graph,
ViewBlockFreqPropagationDAG);
}
std::string getNodeAttributes(const BasicBlock *Node,
const BlockFrequencyInfo *Graph) {
return BFIDOTGTraitsBase::getNodeAttributes(Node, Graph,
ViewHotFreqPercent);
}
std::string getEdgeAttributes(const BasicBlock *Node, EdgeIter EI,
const BlockFrequencyInfo *BFI) {
return BFIDOTGTraitsBase::getEdgeAttributes(Node, EI, BFI, BFI->getBPI(),
ViewHotFreqPercent);
}
};
} // end namespace llvm
#endif
BlockFrequencyInfo::BlockFrequencyInfo() {}
BlockFrequencyInfo::BlockFrequencyInfo(const Function &F,
const BranchProbabilityInfo &BPI,
const LoopInfo &LI) {
calculate(F, BPI, LI);
}
BlockFrequencyInfo::BlockFrequencyInfo(BlockFrequencyInfo &&Arg)
: BFI(std::move(Arg.BFI)) {}
BlockFrequencyInfo &BlockFrequencyInfo::operator=(BlockFrequencyInfo &&RHS) {
releaseMemory();
BFI = std::move(RHS.BFI);
return *this;
}
// Explicitly define the default constructor otherwise it would be implicitly
// defined at the first ODR-use which is the BFI member in the
// LazyBlockFrequencyInfo header. The dtor needs the BlockFrequencyInfoImpl
// template instantiated which is not available in the header.
BlockFrequencyInfo::~BlockFrequencyInfo() {}
void BlockFrequencyInfo::calculate(const Function &F,
const BranchProbabilityInfo &BPI,
const LoopInfo &LI) {
if (!BFI)
BFI.reset(new ImplType);
BFI->calculate(F, BPI, LI);
#ifndef NDEBUG
if (ViewBlockFreqPropagationDAG != GVDT_None &&
(ViewBlockFreqFuncName.empty() ||
F.getName().equals(ViewBlockFreqFuncName))) {
view();
}
#endif
}
BlockFrequency BlockFrequencyInfo::getBlockFreq(const BasicBlock *BB) const {
return BFI ? BFI->getBlockFreq(BB) : 0;
}
Optional<uint64_t>
BlockFrequencyInfo::getBlockProfileCount(const BasicBlock *BB) const {
if (!BFI)
return None;
return BFI->getBlockProfileCount(*getFunction(), BB);
}
Optional<uint64_t>
BlockFrequencyInfo::getProfileCountFromFreq(uint64_t Freq) const {
if (!BFI)
return None;
return BFI->getProfileCountFromFreq(*getFunction(), Freq);
}
void BlockFrequencyInfo::setBlockFreq(const BasicBlock *BB, uint64_t Freq) {
assert(BFI && "Expected analysis to be available");
BFI->setBlockFreq(BB, Freq);
}
/// Pop up a ghostview window with the current block frequency propagation
/// rendered using dot.
void BlockFrequencyInfo::view() const {
// This code is only for debugging.
#ifndef NDEBUG
ViewGraph(const_cast<BlockFrequencyInfo *>(this), "BlockFrequencyDAGs");
#else
errs() << "BlockFrequencyInfo::view is only available in debug builds on "
"systems with Graphviz or gv!\n";
#endif // NDEBUG
}
const Function *BlockFrequencyInfo::getFunction() const {
return BFI ? BFI->getFunction() : nullptr;
}
const BranchProbabilityInfo *BlockFrequencyInfo::getBPI() const {
return BFI ? &BFI->getBPI() : nullptr;
}
raw_ostream &BlockFrequencyInfo::
printBlockFreq(raw_ostream &OS, const BlockFrequency Freq) const {
return BFI ? BFI->printBlockFreq(OS, Freq) : OS;
}
raw_ostream &
BlockFrequencyInfo::printBlockFreq(raw_ostream &OS,
const BasicBlock *BB) const {
return BFI ? BFI->printBlockFreq(OS, BB) : OS;
}
uint64_t BlockFrequencyInfo::getEntryFreq() const {
return BFI ? BFI->getEntryFreq() : 0;
}
void BlockFrequencyInfo::releaseMemory() { BFI.reset(); }
void BlockFrequencyInfo::print(raw_ostream &OS) const {
if (BFI)
BFI->print(OS);
}
INITIALIZE_PASS_BEGIN(BlockFrequencyInfoWrapperPass, "block-freq",
"Block Frequency Analysis", true, true)
INITIALIZE_PASS_DEPENDENCY(BranchProbabilityInfoWrapperPass)
INITIALIZE_PASS_DEPENDENCY(LoopInfoWrapperPass)
INITIALIZE_PASS_END(BlockFrequencyInfoWrapperPass, "block-freq",
"Block Frequency Analysis", true, true)
char BlockFrequencyInfoWrapperPass::ID = 0;
BlockFrequencyInfoWrapperPass::BlockFrequencyInfoWrapperPass()
: FunctionPass(ID) {
initializeBlockFrequencyInfoWrapperPassPass(*PassRegistry::getPassRegistry());
}
BlockFrequencyInfoWrapperPass::~BlockFrequencyInfoWrapperPass() {}
void BlockFrequencyInfoWrapperPass::print(raw_ostream &OS,
const Module *) const {
BFI.print(OS);
}
void BlockFrequencyInfoWrapperPass::getAnalysisUsage(AnalysisUsage &AU) const {
AU.addRequired<BranchProbabilityInfoWrapperPass>();
AU.addRequired<LoopInfoWrapperPass>();
AU.setPreservesAll();
}
void BlockFrequencyInfoWrapperPass::releaseMemory() { BFI.releaseMemory(); }
bool BlockFrequencyInfoWrapperPass::runOnFunction(Function &F) {
BranchProbabilityInfo &BPI =
getAnalysis<BranchProbabilityInfoWrapperPass>().getBPI();
LoopInfo &LI = getAnalysis<LoopInfoWrapperPass>().getLoopInfo();
BFI.calculate(F, BPI, LI);
return false;
}
char BlockFrequencyAnalysis::PassID;
BlockFrequencyInfo BlockFrequencyAnalysis::run(Function &F,
FunctionAnalysisManager &AM) {
BlockFrequencyInfo BFI;
BFI.calculate(F, AM.getResult<BranchProbabilityAnalysis>(F),
AM.getResult<LoopAnalysis>(F));
return BFI;
}
PreservedAnalyses
BlockFrequencyPrinterPass::run(Function &F, FunctionAnalysisManager &AM) {
OS << "Printing analysis results of BFI for function "
<< "'" << F.getName() << "':"
<< "\n";
AM.getResult<BlockFrequencyAnalysis>(F).print(OS);
return PreservedAnalyses::all();
}