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This teaches CoverageMapping::getCoveredFunctions to filter to a particular file and uses that to replace most of the logic found in llvm-cov report. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@221962 91177308-0d34-0410-b5e6-96231b3b80d8
449 lines
16 KiB
C++
449 lines
16 KiB
C++
//=-- CoverageMapping.h - Code coverage mapping support ---------*- C++ -*-=//
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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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// Code coverage mapping data is generated by clang and read by
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// llvm-cov to show code coverage statistics for a file.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_PROFILEDATA_COVERAGEMAPPING_H_
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#define LLVM_PROFILEDATA_COVERAGEMAPPING_H_
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#include "llvm/ADT/ArrayRef.h"
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#include "llvm/ADT/DenseMap.h"
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#include "llvm/ADT/Hashing.h"
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#include "llvm/ADT/iterator.h"
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#include "llvm/Support/ErrorOr.h"
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#include "llvm/Support/raw_ostream.h"
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#include <system_error>
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namespace llvm {
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class IndexedInstrProfReader;
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namespace coverage {
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class ObjectFileCoverageMappingReader;
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class CoverageMapping;
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struct CounterExpressions;
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enum CoverageMappingVersion { CoverageMappingVersion1 };
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/// \brief A Counter is an abstract value that describes how to compute the
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/// execution count for a region of code using the collected profile count data.
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struct Counter {
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enum CounterKind { Zero, CounterValueReference, Expression };
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static const unsigned EncodingTagBits = 2;
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static const unsigned EncodingTagMask = 0x3;
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static const unsigned EncodingCounterTagAndExpansionRegionTagBits =
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EncodingTagBits + 1;
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private:
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CounterKind Kind;
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unsigned ID;
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Counter(CounterKind Kind, unsigned ID) : Kind(Kind), ID(ID) {}
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public:
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Counter() : Kind(Zero), ID(0) {}
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CounterKind getKind() const { return Kind; }
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bool isZero() const { return Kind == Zero; }
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bool isExpression() const { return Kind == Expression; }
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unsigned getCounterID() const { return ID; }
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unsigned getExpressionID() const { return ID; }
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bool operator==(const Counter &Other) const {
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return Kind == Other.Kind && ID == Other.ID;
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}
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friend bool operator<(const Counter &LHS, const Counter &RHS) {
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return std::tie(LHS.Kind, LHS.ID) < std::tie(RHS.Kind, RHS.ID);
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}
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/// \brief Return the counter that represents the number zero.
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static Counter getZero() { return Counter(); }
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/// \brief Return the counter that corresponds to a specific profile counter.
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static Counter getCounter(unsigned CounterId) {
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return Counter(CounterValueReference, CounterId);
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}
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/// \brief Return the counter that corresponds to a specific
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/// addition counter expression.
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static Counter getExpression(unsigned ExpressionId) {
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return Counter(Expression, ExpressionId);
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}
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};
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/// \brief A Counter expression is a value that represents an arithmetic
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/// operation with two counters.
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struct CounterExpression {
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enum ExprKind { Subtract, Add };
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ExprKind Kind;
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Counter LHS, RHS;
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CounterExpression(ExprKind Kind, Counter LHS, Counter RHS)
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: Kind(Kind), LHS(LHS), RHS(RHS) {}
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};
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/// \brief A Counter expression builder is used to construct the
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/// counter expressions. It avoids unecessary duplication
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/// and simplifies algebraic expressions.
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class CounterExpressionBuilder {
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/// \brief A list of all the counter expressions
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std::vector<CounterExpression> Expressions;
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/// \brief A lookup table for the index of a given expression.
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llvm::DenseMap<CounterExpression, unsigned> ExpressionIndices;
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/// \brief Return the counter which corresponds to the given expression.
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///
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/// If the given expression is already stored in the builder, a counter
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/// that references that expression is returned. Otherwise, the given
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/// expression is added to the builder's collection of expressions.
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Counter get(const CounterExpression &E);
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/// \brief Gather the terms of the expression tree for processing.
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///
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/// This collects each addition and subtraction referenced by the counter into
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/// a sequence that can be sorted and combined to build a simplified counter
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/// expression.
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void extractTerms(Counter C, int Sign,
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SmallVectorImpl<std::pair<unsigned, int>> &Terms);
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/// \brief Simplifies the given expression tree
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/// by getting rid of algebraically redundant operations.
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Counter simplify(Counter ExpressionTree);
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public:
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ArrayRef<CounterExpression> getExpressions() const { return Expressions; }
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/// \brief Return a counter that represents the expression
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/// that adds LHS and RHS.
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Counter add(Counter LHS, Counter RHS);
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/// \brief Return a counter that represents the expression
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/// that subtracts RHS from LHS.
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Counter subtract(Counter LHS, Counter RHS);
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};
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/// \brief A Counter mapping region associates a source range with
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/// a specific counter.
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struct CounterMappingRegion {
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enum RegionKind {
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/// \brief A CodeRegion associates some code with a counter
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CodeRegion,
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/// \brief An ExpansionRegion represents a file expansion region that
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/// associates a source range with the expansion of a virtual source file,
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/// such as for a macro instantiation or #include file.
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ExpansionRegion,
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/// \brief A SkippedRegion represents a source range with code that
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/// was skipped by a preprocessor or similar means.
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SkippedRegion
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};
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static const unsigned EncodingHasCodeBeforeBits = 1;
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Counter Count;
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unsigned FileID, ExpandedFileID;
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unsigned LineStart, ColumnStart, LineEnd, ColumnEnd;
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RegionKind Kind;
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/// \brief A flag that is set to true when there is already code before
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/// this region on the same line.
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/// This is useful to accurately compute the execution counts for a line.
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bool HasCodeBefore;
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CounterMappingRegion(Counter Count, unsigned FileID, unsigned LineStart,
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unsigned ColumnStart, unsigned LineEnd,
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unsigned ColumnEnd, bool HasCodeBefore = false,
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RegionKind Kind = CodeRegion)
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: Count(Count), FileID(FileID), ExpandedFileID(0), LineStart(LineStart),
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ColumnStart(ColumnStart), LineEnd(LineEnd), ColumnEnd(ColumnEnd),
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Kind(Kind), HasCodeBefore(HasCodeBefore) {}
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inline std::pair<unsigned, unsigned> startLoc() const {
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return std::pair<unsigned, unsigned>(LineStart, ColumnStart);
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}
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inline std::pair<unsigned, unsigned> endLoc() const {
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return std::pair<unsigned, unsigned>(LineEnd, ColumnEnd);
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}
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bool operator<(const CounterMappingRegion &Other) const {
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if (FileID != Other.FileID)
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return FileID < Other.FileID;
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return startLoc() < Other.startLoc();
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}
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bool contains(const CounterMappingRegion &Other) const {
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if (FileID != Other.FileID)
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return false;
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if (startLoc() > Other.startLoc())
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return false;
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if (endLoc() < Other.endLoc())
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return false;
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return true;
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}
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};
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/// \brief Associates a source range with an execution count.
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struct CountedRegion : public CounterMappingRegion {
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uint64_t ExecutionCount;
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CountedRegion(const CounterMappingRegion &R, uint64_t ExecutionCount)
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: CounterMappingRegion(R), ExecutionCount(ExecutionCount) {}
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};
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/// \brief A Counter mapping context is used to connect the counters,
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/// expressions and the obtained counter values.
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class CounterMappingContext {
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ArrayRef<CounterExpression> Expressions;
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ArrayRef<uint64_t> CounterValues;
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public:
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CounterMappingContext(ArrayRef<CounterExpression> Expressions,
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ArrayRef<uint64_t> CounterValues = ArrayRef<uint64_t>())
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: Expressions(Expressions), CounterValues(CounterValues) {}
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void dump(const Counter &C, llvm::raw_ostream &OS) const;
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void dump(const Counter &C) const { dump(C, llvm::outs()); }
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/// \brief Return the number of times that a region of code associated with
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/// this counter was executed.
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ErrorOr<int64_t> evaluate(const Counter &C) const;
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};
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/// \brief Code coverage information for a single function.
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struct FunctionRecord {
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/// \brief Raw function name.
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std::string Name;
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/// \brief Associated files.
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std::vector<std::string> Filenames;
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/// \brief Regions in the function along with their counts.
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std::vector<CountedRegion> CountedRegions;
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/// \brief The number of times this function was executed.
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uint64_t ExecutionCount;
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FunctionRecord(StringRef Name, ArrayRef<StringRef> Filenames,
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uint64_t ExecutionCount)
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: Name(Name), Filenames(Filenames.begin(), Filenames.end()),
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ExecutionCount(ExecutionCount) {}
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};
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/// \brief Iterator over Functions, optionally filtered to a single file.
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class FunctionRecordIterator
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: public iterator_facade_base<FunctionRecordIterator,
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std::forward_iterator_tag, FunctionRecord> {
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ArrayRef<FunctionRecord> Records;
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ArrayRef<FunctionRecord>::iterator Current;
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StringRef Filename;
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/// \brief Skip records whose primary file is not \c Filename.
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void skipOtherFiles();
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public:
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FunctionRecordIterator(ArrayRef<FunctionRecord> Records_,
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StringRef Filename = "")
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: Records(Records_), Current(Records.begin()), Filename(Filename) {
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skipOtherFiles();
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}
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FunctionRecordIterator() : Current(Records.begin()) {}
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bool operator==(const FunctionRecordIterator &RHS) const {
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return Current == RHS.Current && Filename == RHS.Filename;
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}
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const FunctionRecord &operator*() const { return *Current; }
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FunctionRecordIterator &operator++() {
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assert(Current != Records.end() && "incremented past end");
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++Current;
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skipOtherFiles();
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return *this;
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}
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};
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/// \brief Coverage information for a macro expansion or #included file.
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///
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/// When covered code has pieces that can be expanded for more detail, such as a
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/// preprocessor macro use and its definition, these are represented as
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/// expansions whose coverage can be looked up independently.
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struct ExpansionRecord {
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/// \brief The abstract file this expansion covers.
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unsigned FileID;
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/// \brief The region that expands to this record.
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const CountedRegion &Region;
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/// \brief Coverage for the expansion.
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const FunctionRecord &Function;
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ExpansionRecord(const CountedRegion &Region,
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const FunctionRecord &Function)
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: FileID(Region.ExpandedFileID), Region(Region), Function(Function) {}
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};
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/// \brief The execution count information starting at a point in a file.
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///
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/// A sequence of CoverageSegments gives execution counts for a file in format
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/// that's simple to iterate through for processing.
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struct CoverageSegment {
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/// \brief The line where this segment begins.
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unsigned Line;
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/// \brief The column where this segment begins.
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unsigned Col;
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/// \brief The execution count, or zero if no count was recorded.
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uint64_t Count;
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/// \brief When false, the segment was uninstrumented or skipped.
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bool HasCount;
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/// \brief Whether this enters a new region or returns to a previous count.
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bool IsRegionEntry;
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CoverageSegment(unsigned Line, unsigned Col, bool IsRegionEntry)
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: Line(Line), Col(Col), Count(0), HasCount(false),
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IsRegionEntry(IsRegionEntry) {}
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void setCount(uint64_t NewCount) {
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Count = NewCount;
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HasCount = true;
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}
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void addCount(uint64_t NewCount) { setCount(Count + NewCount); }
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};
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/// \brief Coverage information to be processed or displayed.
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///
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/// This represents the coverage of an entire file, expansion, or function. It
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/// provides a sequence of CoverageSegments to iterate through, as well as the
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/// list of expansions that can be further processed.
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class CoverageData {
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std::string Filename;
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std::vector<CoverageSegment> Segments;
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std::vector<ExpansionRecord> Expansions;
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friend class CoverageMapping;
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public:
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CoverageData() {}
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CoverageData(StringRef Filename) : Filename(Filename) {}
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CoverageData(CoverageData &&RHS)
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: Filename(std::move(RHS.Filename)), Segments(std::move(RHS.Segments)),
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Expansions(std::move(RHS.Expansions)) {}
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/// \brief Get the name of the file this data covers.
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StringRef getFilename() { return Filename; }
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std::vector<CoverageSegment>::iterator begin() { return Segments.begin(); }
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std::vector<CoverageSegment>::iterator end() { return Segments.end(); }
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bool empty() { return Segments.empty(); }
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/// \brief Expansions that can be further processed.
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std::vector<ExpansionRecord> getExpansions() { return Expansions; }
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};
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/// \brief The mapping of profile information to coverage data.
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///
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/// This is the main interface to get coverage information, using a profile to
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/// fill out execution counts.
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class CoverageMapping {
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std::vector<FunctionRecord> Functions;
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unsigned MismatchedFunctionCount;
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CoverageMapping() : MismatchedFunctionCount(0) {}
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public:
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/// \brief Load the coverage mapping using the given readers.
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static ErrorOr<std::unique_ptr<CoverageMapping>>
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load(ObjectFileCoverageMappingReader &CoverageReader,
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IndexedInstrProfReader &ProfileReader);
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/// \brief Load the coverage mapping from the given files.
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static ErrorOr<std::unique_ptr<CoverageMapping>>
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load(StringRef ObjectFilename, StringRef ProfileFilename);
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/// \brief The number of functions that couldn't have their profiles mapped.
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///
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/// This is a count of functions whose profile is out of date or otherwise
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/// can't be associated with any coverage information.
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unsigned getMismatchedCount() { return MismatchedFunctionCount; }
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/// \brief Returns the list of files that are covered.
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std::vector<StringRef> getUniqueSourceFiles() const;
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/// \brief Get the coverage for a particular file.
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///
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/// The given filename must be the name as recorded in the coverage
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/// information. That is, only names returned from getUniqueSourceFiles will
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/// yield a result.
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CoverageData getCoverageForFile(StringRef Filename);
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/// \brief Gets all of the functions covered by this profile.
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iterator_range<FunctionRecordIterator> getCoveredFunctions() const {
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return make_range(FunctionRecordIterator(Functions),
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FunctionRecordIterator());
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}
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/// \brief Gets all of the functions in a particular file.
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iterator_range<FunctionRecordIterator>
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getCoveredFunctions(StringRef Filename) const {
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return make_range(FunctionRecordIterator(Functions, Filename),
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FunctionRecordIterator());
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}
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/// \brief Get the list of function instantiations in the file.
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///
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/// Fucntions that are instantiated more than once, such as C++ template
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/// specializations, have distinct coverage records for each instantiation.
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std::vector<const FunctionRecord *> getInstantiations(StringRef Filename);
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/// \brief Get the coverage for a particular function.
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CoverageData getCoverageForFunction(const FunctionRecord &Function);
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/// \brief Get the coverage for an expansion within a coverage set.
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CoverageData getCoverageForExpansion(const ExpansionRecord &Expansion);
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};
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} // end namespace coverage
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/// \brief Provide DenseMapInfo for CounterExpression
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template<> struct DenseMapInfo<coverage::CounterExpression> {
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static inline coverage::CounterExpression getEmptyKey() {
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using namespace coverage;
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return CounterExpression(CounterExpression::ExprKind::Subtract,
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Counter::getCounter(~0U),
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Counter::getCounter(~0U));
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}
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static inline coverage::CounterExpression getTombstoneKey() {
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using namespace coverage;
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return CounterExpression(CounterExpression::ExprKind::Add,
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Counter::getCounter(~0U),
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Counter::getCounter(~0U));
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}
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static unsigned getHashValue(const coverage::CounterExpression &V) {
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return static_cast<unsigned>(
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hash_combine(V.Kind, V.LHS.getKind(), V.LHS.getCounterID(),
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V.RHS.getKind(), V.RHS.getCounterID()));
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}
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static bool isEqual(const coverage::CounterExpression &LHS,
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const coverage::CounterExpression &RHS) {
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return LHS.Kind == RHS.Kind && LHS.LHS == RHS.LHS && LHS.RHS == RHS.RHS;
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}
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};
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} // end namespace llvm
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#endif // LLVM_PROFILEDATA_COVERAGEMAPPING_H_
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