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//===-- BlockCoverageInference.h - Minimal Execution Coverage ---*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
///
/// \file
/// This file finds the minimum set of blocks on a CFG that must be instrumented
/// to infer execution coverage for the whole graph.
///
//===----------------------------------------------------------------------===//
#ifndef LLVM_TRANSFORMS_INSTRUMENTATION_BLOCKCOVERAGEINFERENCE_H
#define LLVM_TRANSFORMS_INSTRUMENTATION_BLOCKCOVERAGEINFERENCE_H
#include "llvm/ADT/ArrayRef.h"
#include "llvm/ADT/DenseMap.h"
#include "llvm/ADT/SetVector.h"
#include "llvm/Support/raw_ostream.h"
namespace llvm {
class Function;
class BasicBlock;
class DotFuncBCIInfo;
class BlockCoverageInference {
friend class DotFuncBCIInfo;
public:
using BlockSet = SmallSetVector<const BasicBlock *, 4>;
BlockCoverageInference(const Function &F, bool ForceInstrumentEntry);
/// \return true if \p BB should be instrumented for coverage.
bool shouldInstrumentBlock(const BasicBlock &BB) const;
/// \return the set of blocks \p Deps such that \p BB is covered iff any
/// blocks in \p Deps are covered.
BlockSet getDependencies(const BasicBlock &BB) const;
/// \return a hash that depends on the set of instrumented blocks.
uint64_t getInstrumentedBlocksHash() const;
/// Dump the inference graph.
void dump(raw_ostream &OS) const;
/// View the inferred block coverage as a dot file.
/// Filled gray blocks are instrumented, red outlined blocks are found to be
/// covered, red edges show that a block's coverage can be inferred from its
/// successors, and blue edges show that a block's coverage can be inferred
/// from its predecessors.
void viewBlockCoverageGraph(
const DenseMap<const BasicBlock *, bool> *Coverage = nullptr) const;
private:
const Function &F;
bool ForceInstrumentEntry;
/// Maps blocks to a minimal list of predecessors that can be used to infer
/// this block's coverage.
DenseMap<const BasicBlock *, BlockSet> PredecessorDependencies;
/// Maps blocks to a minimal list of successors that can be used to infer
/// this block's coverage.
DenseMap<const BasicBlock *, BlockSet> SuccessorDependencies;
/// Compute \p PredecessorDependencies and \p SuccessorDependencies.
void findDependencies();
/// Find the set of basic blocks that are reachable from \p Start without the
/// basic block \p Avoid.
void getReachableAvoiding(const BasicBlock &Start, const BasicBlock &Avoid,
bool IsForward, BlockSet &Reachable) const;
static std::string getBlockNames(ArrayRef<const BasicBlock *> BBs);
static std::string getBlockNames(BlockSet BBs) {
return getBlockNames(ArrayRef<const BasicBlock *>(BBs.begin(), BBs.end()));
}
};
} // end namespace llvm
#endif // LLVM_TRANSFORMS_INSTRUMENTATION_BLOCKCOVERAGEINFERENCE_H
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