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63688e622c
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@218999 91177308-0d34-0410-b5e6-96231b3b80d8
468 lines
16 KiB
C++
468 lines
16 KiB
C++
//=-- CoverageMapping.cpp - 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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// This file contains support for clang's and llvm's instrumentation based
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// code coverage.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/ProfileData/CoverageMapping.h"
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#include "llvm/ADT/DenseMap.h"
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#include "llvm/ADT/Optional.h"
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#include "llvm/ADT/SmallSet.h"
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#include "llvm/ProfileData/CoverageMappingReader.h"
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#include "llvm/ProfileData/InstrProfReader.h"
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#include "llvm/Support/Debug.h"
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#include "llvm/Support/ErrorHandling.h"
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using namespace llvm;
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using namespace coverage;
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#define DEBUG_TYPE "coverage-mapping"
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Counter CounterExpressionBuilder::get(const CounterExpression &E) {
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auto It = ExpressionIndices.find(E);
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if (It != ExpressionIndices.end())
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return Counter::getExpression(It->second);
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unsigned I = Expressions.size();
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Expressions.push_back(E);
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ExpressionIndices[E] = I;
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return Counter::getExpression(I);
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}
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void CounterExpressionBuilder::extractTerms(
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Counter C, int Sign, SmallVectorImpl<std::pair<unsigned, int>> &Terms) {
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switch (C.getKind()) {
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case Counter::Zero:
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break;
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case Counter::CounterValueReference:
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Terms.push_back(std::make_pair(C.getCounterID(), Sign));
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break;
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case Counter::Expression:
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const auto &E = Expressions[C.getExpressionID()];
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extractTerms(E.LHS, Sign, Terms);
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extractTerms(E.RHS, E.Kind == CounterExpression::Subtract ? -Sign : Sign,
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Terms);
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break;
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}
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}
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Counter CounterExpressionBuilder::simplify(Counter ExpressionTree) {
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// Gather constant terms.
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llvm::SmallVector<std::pair<unsigned, int>, 32> Terms;
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extractTerms(ExpressionTree, +1, Terms);
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// If there are no terms, this is just a zero. The algorithm below assumes at
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// least one term.
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if (Terms.size() == 0)
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return Counter::getZero();
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// Group the terms by counter ID.
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std::sort(Terms.begin(), Terms.end(),
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[](const std::pair<unsigned, int> &LHS,
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const std::pair<unsigned, int> &RHS) {
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return LHS.first < RHS.first;
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});
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// Combine terms by counter ID to eliminate counters that sum to zero.
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auto Prev = Terms.begin();
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for (auto I = Prev + 1, E = Terms.end(); I != E; ++I) {
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if (I->first == Prev->first) {
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Prev->second += I->second;
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continue;
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}
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++Prev;
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*Prev = *I;
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}
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Terms.erase(++Prev, Terms.end());
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Counter C;
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// Create additions. We do this before subtractions to avoid constructs like
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// ((0 - X) + Y), as opposed to (Y - X).
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for (auto Term : Terms) {
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if (Term.second <= 0)
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continue;
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for (int I = 0; I < Term.second; ++I)
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if (C.isZero())
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C = Counter::getCounter(Term.first);
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else
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C = get(CounterExpression(CounterExpression::Add, C,
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Counter::getCounter(Term.first)));
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}
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// Create subtractions.
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for (auto Term : Terms) {
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if (Term.second >= 0)
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continue;
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for (int I = 0; I < -Term.second; ++I)
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C = get(CounterExpression(CounterExpression::Subtract, C,
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Counter::getCounter(Term.first)));
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}
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return C;
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}
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Counter CounterExpressionBuilder::add(Counter LHS, Counter RHS) {
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return simplify(get(CounterExpression(CounterExpression::Add, LHS, RHS)));
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}
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Counter CounterExpressionBuilder::subtract(Counter LHS, Counter RHS) {
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return simplify(
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get(CounterExpression(CounterExpression::Subtract, LHS, RHS)));
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}
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void CounterMappingContext::dump(const Counter &C,
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llvm::raw_ostream &OS) const {
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switch (C.getKind()) {
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case Counter::Zero:
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OS << '0';
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return;
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case Counter::CounterValueReference:
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OS << '#' << C.getCounterID();
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break;
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case Counter::Expression: {
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if (C.getExpressionID() >= Expressions.size())
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return;
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const auto &E = Expressions[C.getExpressionID()];
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OS << '(';
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dump(E.LHS, OS);
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OS << (E.Kind == CounterExpression::Subtract ? " - " : " + ");
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dump(E.RHS, OS);
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OS << ')';
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break;
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}
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}
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if (CounterValues.empty())
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return;
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ErrorOr<int64_t> Value = evaluate(C);
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if (!Value)
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return;
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OS << '[' << *Value << ']';
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}
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ErrorOr<int64_t> CounterMappingContext::evaluate(const Counter &C) const {
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switch (C.getKind()) {
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case Counter::Zero:
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return 0;
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case Counter::CounterValueReference:
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if (C.getCounterID() >= CounterValues.size())
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return std::make_error_code(std::errc::argument_out_of_domain);
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return CounterValues[C.getCounterID()];
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case Counter::Expression: {
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if (C.getExpressionID() >= Expressions.size())
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return std::make_error_code(std::errc::argument_out_of_domain);
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const auto &E = Expressions[C.getExpressionID()];
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ErrorOr<int64_t> LHS = evaluate(E.LHS);
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if (!LHS)
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return LHS;
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ErrorOr<int64_t> RHS = evaluate(E.RHS);
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if (!RHS)
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return RHS;
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return E.Kind == CounterExpression::Subtract ? *LHS - *RHS : *LHS + *RHS;
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}
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}
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llvm_unreachable("Unhandled CounterKind");
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}
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ErrorOr<std::unique_ptr<CoverageMapping>>
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CoverageMapping::load(ObjectFileCoverageMappingReader &CoverageReader,
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IndexedInstrProfReader &ProfileReader) {
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auto Coverage = std::unique_ptr<CoverageMapping>(new CoverageMapping());
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std::vector<uint64_t> Counts;
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for (const auto &Record : CoverageReader) {
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Counts.clear();
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if (std::error_code EC = ProfileReader.getFunctionCounts(
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Record.FunctionName, Record.FunctionHash, Counts)) {
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if (EC != instrprof_error::hash_mismatch &&
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EC != instrprof_error::unknown_function)
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return EC;
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Coverage->MismatchedFunctionCount++;
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continue;
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}
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assert(Counts.size() != 0 && "Function's counts are empty");
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FunctionRecord Function(Record.FunctionName, Record.Filenames,
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Counts.front());
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CounterMappingContext Ctx(Record.Expressions, Counts);
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for (const auto &Region : Record.MappingRegions) {
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ErrorOr<int64_t> ExecutionCount = Ctx.evaluate(Region.Count);
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if (!ExecutionCount)
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break;
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Function.CountedRegions.push_back(CountedRegion(Region, *ExecutionCount));
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}
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if (Function.CountedRegions.size() != Record.MappingRegions.size()) {
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Coverage->MismatchedFunctionCount++;
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continue;
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}
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Coverage->Functions.push_back(std::move(Function));
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}
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return std::move(Coverage);
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}
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ErrorOr<std::unique_ptr<CoverageMapping>>
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CoverageMapping::load(StringRef ObjectFilename, StringRef ProfileFilename) {
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auto CounterMappingBuff = MemoryBuffer::getFileOrSTDIN(ObjectFilename);
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if (auto EC = CounterMappingBuff.getError())
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return EC;
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ObjectFileCoverageMappingReader CoverageReader(CounterMappingBuff.get());
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if (auto EC = CoverageReader.readHeader())
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return EC;
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std::unique_ptr<IndexedInstrProfReader> ProfileReader;
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if (auto EC = IndexedInstrProfReader::create(ProfileFilename, ProfileReader))
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return EC;
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return load(CoverageReader, *ProfileReader);
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}
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namespace {
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/// \brief Distributes functions into instantiation sets.
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///
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/// An instantiation set is a collection of functions that have the same source
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/// code, ie, template functions specializations.
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class FunctionInstantiationSetCollector {
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typedef DenseMap<std::pair<unsigned, unsigned>,
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std::vector<const FunctionRecord *>> MapT;
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MapT InstantiatedFunctions;
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public:
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void insert(const FunctionRecord &Function, unsigned FileID) {
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auto I = Function.CountedRegions.begin(), E = Function.CountedRegions.end();
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while (I != E && I->FileID != FileID)
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++I;
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assert(I != E && "function does not cover the given file");
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auto &Functions = InstantiatedFunctions[I->startLoc()];
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Functions.push_back(&Function);
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}
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MapT::iterator begin() { return InstantiatedFunctions.begin(); }
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MapT::iterator end() { return InstantiatedFunctions.end(); }
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};
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class SegmentBuilder {
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std::vector<CoverageSegment> Segments;
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SmallVector<const CountedRegion *, 8> ActiveRegions;
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/// Start a segment with no count specified.
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void startSegment(unsigned Line, unsigned Col) {
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DEBUG(dbgs() << "Top level segment at " << Line << ":" << Col << "\n");
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Segments.emplace_back(Line, Col, /*IsRegionEntry=*/false);
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}
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/// Start a segment with the given Region's count.
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void startSegment(unsigned Line, unsigned Col, bool IsRegionEntry,
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const CountedRegion &Region) {
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if (Segments.empty())
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Segments.emplace_back(Line, Col, IsRegionEntry);
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CoverageSegment S = Segments.back();
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// Avoid creating empty regions.
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if (S.Line != Line || S.Col != Col) {
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Segments.emplace_back(Line, Col, IsRegionEntry);
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S = Segments.back();
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}
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DEBUG(dbgs() << "Segment at " << Line << ":" << Col);
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// Set this region's count.
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if (Region.Kind != coverage::CounterMappingRegion::SkippedRegion) {
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DEBUG(dbgs() << " with count " << Region.ExecutionCount);
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Segments.back().setCount(Region.ExecutionCount);
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}
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DEBUG(dbgs() << "\n");
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}
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/// Start a segment for the given region.
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void startSegment(const CountedRegion &Region) {
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startSegment(Region.LineStart, Region.ColumnStart, true, Region);
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}
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/// Pop the top region off of the active stack, starting a new segment with
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/// the containing Region's count.
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void popRegion() {
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const CountedRegion *Active = ActiveRegions.back();
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unsigned Line = Active->LineEnd, Col = Active->ColumnEnd;
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ActiveRegions.pop_back();
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if (ActiveRegions.empty())
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startSegment(Line, Col);
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else
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startSegment(Line, Col, false, *ActiveRegions.back());
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}
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public:
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/// Build a list of CoverageSegments from a sorted list of Regions.
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std::vector<CoverageSegment> buildSegments(ArrayRef<CountedRegion> Regions) {
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for (const auto &Region : Regions) {
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// Pop any regions that end before this one starts.
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while (!ActiveRegions.empty() &&
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ActiveRegions.back()->endLoc() <= Region.startLoc())
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popRegion();
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if (Segments.size() && Segments.back().Line == Region.LineStart &&
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Segments.back().Col == Region.ColumnStart) {
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if (Region.Kind != coverage::CounterMappingRegion::SkippedRegion)
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Segments.back().addCount(Region.ExecutionCount);
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} else {
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// Add this region to the stack.
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ActiveRegions.push_back(&Region);
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startSegment(Region);
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}
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}
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// Pop any regions that are left in the stack.
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while (!ActiveRegions.empty())
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popRegion();
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return Segments;
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}
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};
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}
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std::vector<StringRef> CoverageMapping::getUniqueSourceFiles() {
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std::vector<StringRef> Filenames;
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for (const auto &Function : getCoveredFunctions())
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for (const auto &Filename : Function.Filenames)
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Filenames.push_back(Filename);
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std::sort(Filenames.begin(), Filenames.end());
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auto Last = std::unique(Filenames.begin(), Filenames.end());
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Filenames.erase(Last, Filenames.end());
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return Filenames;
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}
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static Optional<unsigned> findMainViewFileID(StringRef SourceFile,
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const FunctionRecord &Function) {
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llvm::SmallVector<bool, 8> IsExpandedFile(Function.Filenames.size(), false);
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llvm::SmallVector<bool, 8> FilenameEquivalence(Function.Filenames.size(),
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false);
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for (unsigned I = 0, E = Function.Filenames.size(); I < E; ++I)
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if (SourceFile == Function.Filenames[I])
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FilenameEquivalence[I] = true;
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for (const auto &CR : Function.CountedRegions)
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if (CR.Kind == CounterMappingRegion::ExpansionRegion &&
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FilenameEquivalence[CR.FileID])
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IsExpandedFile[CR.ExpandedFileID] = true;
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for (unsigned I = 0, E = Function.Filenames.size(); I < E; ++I)
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if (FilenameEquivalence[I] && !IsExpandedFile[I])
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return I;
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return None;
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}
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static Optional<unsigned> findMainViewFileID(const FunctionRecord &Function) {
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llvm::SmallVector<bool, 8> IsExpandedFile(Function.Filenames.size(), false);
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for (const auto &CR : Function.CountedRegions)
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if (CR.Kind == CounterMappingRegion::ExpansionRegion)
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IsExpandedFile[CR.ExpandedFileID] = true;
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for (unsigned I = 0, E = Function.Filenames.size(); I < E; ++I)
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if (!IsExpandedFile[I])
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return I;
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return None;
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}
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static SmallSet<unsigned, 8> gatherFileIDs(StringRef SourceFile,
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const FunctionRecord &Function) {
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SmallSet<unsigned, 8> IDs;
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for (unsigned I = 0, E = Function.Filenames.size(); I < E; ++I)
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if (SourceFile == Function.Filenames[I])
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IDs.insert(I);
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return IDs;
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}
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/// Sort a nested sequence of regions from a single file.
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template <class It> static void sortNestedRegions(It First, It Last) {
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std::sort(First, Last,
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[](const CountedRegion &LHS, const CountedRegion &RHS) {
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if (LHS.startLoc() == RHS.startLoc())
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// When LHS completely contains RHS, we sort LHS first.
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return RHS.endLoc() < LHS.endLoc();
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return LHS.startLoc() < RHS.startLoc();
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});
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}
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static bool isExpansion(const CountedRegion &R, unsigned FileID) {
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return R.Kind == CounterMappingRegion::ExpansionRegion && R.FileID == FileID;
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}
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CoverageData CoverageMapping::getCoverageForFile(StringRef Filename) {
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CoverageData FileCoverage(Filename);
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std::vector<coverage::CountedRegion> Regions;
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for (const auto &Function : Functions) {
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auto MainFileID = findMainViewFileID(Filename, Function);
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if (!MainFileID)
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continue;
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auto FileIDs = gatherFileIDs(Filename, Function);
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for (const auto &CR : Function.CountedRegions)
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if (FileIDs.count(CR.FileID)) {
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Regions.push_back(CR);
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if (isExpansion(CR, *MainFileID))
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FileCoverage.Expansions.emplace_back(CR, Function);
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}
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}
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sortNestedRegions(Regions.begin(), Regions.end());
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FileCoverage.Segments = SegmentBuilder().buildSegments(Regions);
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return FileCoverage;
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}
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std::vector<const FunctionRecord *>
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CoverageMapping::getInstantiations(StringRef Filename) {
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FunctionInstantiationSetCollector InstantiationSetCollector;
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for (const auto &Function : Functions) {
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auto MainFileID = findMainViewFileID(Filename, Function);
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if (!MainFileID)
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continue;
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InstantiationSetCollector.insert(Function, *MainFileID);
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}
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std::vector<const FunctionRecord *> Result;
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for (const auto &InstantiationSet : InstantiationSetCollector) {
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if (InstantiationSet.second.size() < 2)
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continue;
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for (auto Function : InstantiationSet.second)
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Result.push_back(Function);
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}
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return Result;
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}
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CoverageData
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CoverageMapping::getCoverageForFunction(const FunctionRecord &Function) {
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auto MainFileID = findMainViewFileID(Function);
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if (!MainFileID)
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return CoverageData();
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CoverageData FunctionCoverage(Function.Filenames[*MainFileID]);
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std::vector<coverage::CountedRegion> Regions;
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for (const auto &CR : Function.CountedRegions)
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if (CR.FileID == *MainFileID) {
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Regions.push_back(CR);
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if (isExpansion(CR, *MainFileID))
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FunctionCoverage.Expansions.emplace_back(CR, Function);
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}
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sortNestedRegions(Regions.begin(), Regions.end());
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FunctionCoverage.Segments = SegmentBuilder().buildSegments(Regions);
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return FunctionCoverage;
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}
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CoverageData
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CoverageMapping::getCoverageForExpansion(const ExpansionRecord &Expansion) {
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CoverageData ExpansionCoverage(
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Expansion.Function.Filenames[Expansion.FileID]);
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std::vector<coverage::CountedRegion> Regions;
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for (const auto &CR : Expansion.Function.CountedRegions)
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if (CR.FileID == Expansion.FileID) {
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Regions.push_back(CR);
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if (isExpansion(CR, Expansion.FileID))
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ExpansionCoverage.Expansions.emplace_back(CR, Expansion.Function);
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}
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sortNestedRegions(Regions.begin(), Regions.end());
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ExpansionCoverage.Segments = SegmentBuilder().buildSegments(Regions);
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return ExpansionCoverage;
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}
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