PathDiagnostic.h

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//===- PathDiagnostic.h - Path-Specific Diagnostic Handling -----*- 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
//
//===----------------------------------------------------------------------===//
//
//  This file defines the PathDiagnostic-related interfaces.
//
//===----------------------------------------------------------------------===//
 
#ifndef LLVM_CLANG_ANALYSIS_PATHDIAGNOSTIC_H
#define LLVM_CLANG_ANALYSIS_PATHDIAGNOSTIC_H
 
#include "clang/AST/Stmt.h"
#include "clang/Analysis/AnalysisDeclContext.h"
#include "clang/Basic/LLVM.h"
#include "clang/Basic/SourceLocation.h"
#include "llvm/ADT/ArrayRef.h"
#include "llvm/ADT/FoldingSet.h"
#include "llvm/ADT/PointerUnion.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/Support/Allocator.h"
#include <cassert>
#include <deque>
#include <iterator>
#include <list>
#include <map>
#include <memory>
#include <optional>
#include <set>
#include <string>
#include <utility>
#include <vector>
 
namespace clang {
 
class AnalysisDeclContext;
class BinaryOperator;
class CallEnter;
class CallExitEnd;
class ConditionalOperator;
class Decl;
class LocationContext;
class MemberExpr;
class ProgramPoint;
class SourceManager;
 
namespace ento {
 
//===----------------------------------------------------------------------===//
// High-level interface for handlers of path-sensitive diagnostics.
//===----------------------------------------------------------------------===//
 
class PathDiagnostic;
 
/// These options tweak the behavior of path diangostic consumers.
/// Most of these options are currently supported by very few consumers.
struct PathDiagnosticConsumerOptions {
  /// Run-line of the tool that produced the diagnostic.
  /// It can be included with the diagnostic for debugging purposes.
  std::string ToolInvocation;
 
  /// Whether to include additional information about macro expansions
  /// with the diagnostics, because otherwise they can be hard to obtain
  /// without re-compiling the program under analysis.
  bool ShouldDisplayMacroExpansions = false;
 
  /// Whether to include LLVM statistics of the process in the diagnostic.
  /// Useful for profiling the tool on large real-world codebases.
  bool ShouldSerializeStats = false;
 
  /// If the consumer intends to produce multiple output files, should it
  /// use a pseudo-random file name or a human-readable file name.
  bool ShouldWriteVerboseReportFilename = false;
 
  /// Whether the consumer should treat consumed diagnostics as hard errors.
  /// Useful for breaking your build when issues are found.
  bool ShouldDisplayWarningsAsErrors = false;
 
  /// Whether the consumer should attempt to rewrite the source file
  /// with fix-it hints attached to the diagnostics it consumes.
  bool ShouldApplyFixIts = false;
 
  /// Whether the consumer should present the name of the entity that emitted
  /// the diagnostic (eg., a checker) so that the user knew how to disable it.
  bool ShouldDisplayDiagnosticName = false;
};
 
class PathDiagnosticConsumer {
public:
  class PDFileEntry : public llvm::FoldingSetNode {
  public:
    PDFileEntry(llvm::FoldingSetNodeID &NodeID) : NodeID(NodeID) {}
 
    using ConsumerFiles = std::vector<std::pair<StringRef, StringRef>>;
 
    /// A vector of <consumer,file> pairs.
    ConsumerFiles files;
 
    /// A precomputed hash tag used for uniquing PDFileEntry objects.
    const llvm::FoldingSetNodeID NodeID;
 
    /// Used for profiling in the FoldingSet.
    void Profile(llvm::FoldingSetNodeID &ID) { ID = NodeID; }
  };
 
  class FilesMade {
    llvm::BumpPtrAllocator Alloc;
    llvm::FoldingSet<PDFileEntry> Set;
 
  public:
    ~FilesMade();
 
    bool empty() const { return Set.empty(); }
 
    void addDiagnostic(const PathDiagnostic &PD,
                       StringRef ConsumerName,
                       StringRef fileName);
 
    PDFileEntry::ConsumerFiles *getFiles(const PathDiagnostic &PD);
  };
 
private:
  virtual void anchor();
 
public:
  PathDiagnosticConsumer() = default;
  virtual ~PathDiagnosticConsumer();
 
  void FlushDiagnostics(FilesMade *FilesMade);
 
  virtual void FlushDiagnosticsImpl(std::vector<const PathDiagnostic *> &Diags,
                                    FilesMade *filesMade) = 0;
 
  virtual StringRef getName() const = 0;
 
  void HandlePathDiagnostic(std::unique_ptr<PathDiagnostic> D);
 
  enum PathGenerationScheme {
    /// Only runs visitors, no output generated.
    None,
 
    /// Used for SARIF and text output.
    Minimal,
 
    /// Used for plist output, used for "arrows" generation.
    Extensive,
 
    /// Used for HTML, shows both "arrows" and control notes.
    Everything
  };
 
  virtual PathGenerationScheme getGenerationScheme() const { return Minimal; }
 
  bool shouldGenerateDiagnostics() const {
    return getGenerationScheme() != None;
  }
 
  bool shouldAddPathEdges() const { return getGenerationScheme() >= Extensive; }
  bool shouldAddControlNotes() const {
    return getGenerationScheme() == Minimal ||
           getGenerationScheme() == Everything;
  }
 
  virtual bool supportsLogicalOpControlFlow() const { return false; }
 
  /// Return true if the PathDiagnosticConsumer supports individual
  /// PathDiagnostics that span multiple files.
  virtual bool supportsCrossFileDiagnostics() const { return false; }
 
protected:
  bool flushed = false;
  llvm::FoldingSet<PathDiagnostic> Diags;
};
 
//===----------------------------------------------------------------------===//
// Path-sensitive diagnostics.
//===----------------------------------------------------------------------===//
 
class PathDiagnosticRange : public SourceRange {
public:
  bool isPoint = false;
 
  PathDiagnosticRange(SourceRange R, bool isP = false)
      : SourceRange(R), isPoint(isP) {}
  PathDiagnosticRange() = default;
};
 
using LocationOrAnalysisDeclContext =
    llvm::PointerUnion<const LocationContext *, AnalysisDeclContext *>;
 
class PathDiagnosticLocation {
private:
  enum Kind { RangeK, SingleLocK, StmtK, DeclK } K = SingleLocK;
 
  const Stmt *S = nullptr;
  const Decl *D = nullptr;
  const SourceManager *SM = nullptr;
  FullSourceLoc Loc;
  PathDiagnosticRange Range;
 
  PathDiagnosticLocation(SourceLocation L, const SourceManager &sm, Kind kind)
      : K(kind), SM(&sm), Loc(genLocation(L)), Range(genRange()) {}
 
  FullSourceLoc genLocation(
      SourceLocation L = SourceLocation(),
      LocationOrAnalysisDeclContext LAC = (AnalysisDeclContext *)nullptr) const;
 
  PathDiagnosticRange genRange(
      LocationOrAnalysisDeclContext LAC = (AnalysisDeclContext *)nullptr) const;
 
public:
  /// Create an invalid location.
  PathDiagnosticLocation() = default;
 
  /// Create a location corresponding to the given statement.
  PathDiagnosticLocation(const Stmt *s, const SourceManager &sm,
                         LocationOrAnalysisDeclContext lac)
      : K(s->getBeginLoc().isValid() ? StmtK : SingleLocK),
        S(K == StmtK ? s : nullptr), SM(&sm),
        Loc(genLocation(SourceLocation(), lac)), Range(genRange(lac)) {
    assert(K == SingleLocK || S);
    assert(K == SingleLocK || Loc.isValid());
    assert(K == SingleLocK || Range.isValid());
  }
 
  /// Create a location corresponding to the given declaration.
  PathDiagnosticLocation(const Decl *d, const SourceManager &sm)
      : K(DeclK), D(d), SM(&sm), Loc(genLocation()), Range(genRange()) {
    assert(D);
    assert(Loc.isValid());
    assert(Range.isValid());
  }
 
  /// Create a location at an explicit offset in the source.
  ///
  /// This should only be used if there are no more appropriate constructors.
  PathDiagnosticLocation(SourceLocation loc, const SourceManager &sm)
      : SM(&sm), Loc(loc, sm), Range(genRange()) {
    assert(Loc.isValid());
    assert(Range.isValid());
  }
 
  /// Create a location corresponding to the given declaration.
  static PathDiagnosticLocation create(const Decl *D,
                                       const SourceManager &SM) {
    return PathDiagnosticLocation(D, SM);
  }
 
  /// Create a location for the beginning of the declaration.
  static PathDiagnosticLocation createBegin(const Decl *D,
                                            const SourceManager &SM);
 
  /// Create a location for the beginning of the declaration.
  /// The third argument is ignored, useful for generic treatment
  /// of statements and declarations.
  static PathDiagnosticLocation
  createBegin(const Decl *D, const SourceManager &SM,
              const LocationOrAnalysisDeclContext LAC) {
    return createBegin(D, SM);
  }
 
  /// Create a location for the beginning of the statement.
  static PathDiagnosticLocation createBegin(const Stmt *S,
                                            const SourceManager &SM,
                                            const LocationOrAnalysisDeclContext LAC);
 
  /// Create a location for the end of the statement.
  ///
  /// If the statement is a CompoundStatement, the location will point to the
  /// closing brace instead of following it.
  static PathDiagnosticLocation createEnd(const Stmt *S,
                                          const SourceManager &SM,
                                       const LocationOrAnalysisDeclContext LAC);
 
  /// Create the location for the operator of the binary expression.
  /// Assumes the statement has a valid location.
  static PathDiagnosticLocation createOperatorLoc(const BinaryOperator *BO,
                                                  const SourceManager &SM);
  static PathDiagnosticLocation createConditionalColonLoc(
                                                  const ConditionalOperator *CO,
                                                  const SourceManager &SM);
 
  /// For member expressions, return the location of the '.' or '->'.
  /// Assumes the statement has a valid location.
  static PathDiagnosticLocation createMemberLoc(const MemberExpr *ME,
                                                const SourceManager &SM);
 
  /// Create a location for the beginning of the compound statement.
  /// Assumes the statement has a valid location.
  static PathDiagnosticLocation createBeginBrace(const CompoundStmt *CS,
                                                 const SourceManager &SM);
 
  /// Create a location for the end of the compound statement.
  /// Assumes the statement has a valid location.
  static PathDiagnosticLocation createEndBrace(const CompoundStmt *CS,
                                               const SourceManager &SM);
 
  /// Create a location for the beginning of the enclosing declaration body.
  /// Defaults to the beginning of the first statement in the declaration body.
  static PathDiagnosticLocation createDeclBegin(const LocationContext *LC,
                                                const SourceManager &SM);
 
  /// Constructs a location for the end of the enclosing declaration body.
  /// Defaults to the end of brace.
  static PathDiagnosticLocation createDeclEnd(const LocationContext *LC,
                                                   const SourceManager &SM);
 
  /// Create a location corresponding to the given valid ProgramPoint.
  static PathDiagnosticLocation create(const ProgramPoint &P,
                                       const SourceManager &SMng);
 
  /// Convert the given location into a single kind location.
  static PathDiagnosticLocation createSingleLocation(
                                             const PathDiagnosticLocation &PDL);
 
  /// Construct a source location that corresponds to either the beginning
  /// or the end of the given statement, or a nearby valid source location
  /// if the statement does not have a valid source location of its own.
  static SourceLocation
  getValidSourceLocation(const Stmt *S, LocationOrAnalysisDeclContext LAC,
                         bool UseEndOfStatement = false);
 
  bool operator==(const PathDiagnosticLocation &X) const {
    return K == X.K && Loc == X.Loc && Range == X.Range;
  }
 
  bool operator!=(const PathDiagnosticLocation &X) const {
    return !(*this == X);
  }
 
  bool isValid() const {
    return SM != nullptr;
  }
 
  FullSourceLoc asLocation() const {
    return Loc;
  }
 
  PathDiagnosticRange asRange() const {
    return Range;
  }
 
  const Stmt *asStmt() const { assert(isValid()); return S; }
  const Stmt *getStmtOrNull() const {
    if (!isValid())
      return nullptr;
    return asStmt();
  }
 
  const Decl *asDecl() const { assert(isValid()); return D; }
 
  bool hasRange() const { return K == StmtK || K == RangeK || K == DeclK; }
 
  bool hasValidLocation() const { return asLocation().isValid(); }
 
  void invalidate() {
    *this = PathDiagnosticLocation();
  }
 
  void flatten();
 
  const SourceManager& getManager() const { assert(isValid()); return *SM; }
 
  void Profile(llvm::FoldingSetNodeID &ID) const;
 
  void dump() const;
};
 
class PathDiagnosticLocationPair {
private:
  PathDiagnosticLocation Start, End;
 
public:
  PathDiagnosticLocationPair(const PathDiagnosticLocation &start,
                             const PathDiagnosticLocation &end)
      : Start(start), End(end) {}
 
  const PathDiagnosticLocation &getStart() const { return Start; }
  const PathDiagnosticLocation &getEnd() const { return End; }
 
  void setStart(const PathDiagnosticLocation &L) { Start = L; }
  void setEnd(const PathDiagnosticLocation &L) { End = L; }
 
  void flatten() {
    Start.flatten();
    End.flatten();
  }
 
  void Profile(llvm::FoldingSetNodeID &ID) const {
    Start.Profile(ID);
    End.Profile(ID);
  }
};
 
//===----------------------------------------------------------------------===//
// Path "pieces" for path-sensitive diagnostics.
//===----------------------------------------------------------------------===//
 
class PathDiagnosticPiece: public llvm::FoldingSetNode {
public:
  enum Kind { ControlFlow, Event, Macro, Call, Note, PopUp };
  enum DisplayHint { Above, Below };
 
private:
  const std::string str;
  const Kind kind;
  const DisplayHint Hint;
 
  /// In the containing bug report, this piece is the last piece from
  /// the main source file.
  bool LastInMainSourceFile = false;
 
  /// A constant string that can be used to tag the PathDiagnosticPiece,
  /// typically with the identification of the creator.  The actual pointer
  /// value is meant to be an identifier; the string itself is useful for
  /// debugging.
  StringRef Tag;
 
  std::vector<SourceRange> ranges;
  std::vector<FixItHint> fixits;
 
protected:
  PathDiagnosticPiece(StringRef s, Kind k, DisplayHint hint = Below);
  PathDiagnosticPiece(Kind k, DisplayHint hint = Below);
 
public:
  PathDiagnosticPiece() = delete;
  PathDiagnosticPiece(const PathDiagnosticPiece &) = delete;
  PathDiagnosticPiece &operator=(const PathDiagnosticPiece &) = delete;
  virtual ~PathDiagnosticPiece();
 
  StringRef getString() const { return str; }
 
  /// Tag this PathDiagnosticPiece with the given C-string.
  void setTag(const char *tag) { Tag = tag; }
 
  /// Return the opaque tag (if any) on the PathDiagnosticPiece.
  const void *getTag() const { return Tag.data(); }
 
  /// Return the string representation of the tag.  This is useful
  /// for debugging.
  StringRef getTagStr() const { return Tag; }
 
  /// getDisplayHint - Return a hint indicating where the diagnostic should
  ///  be displayed by the PathDiagnosticConsumer.
  DisplayHint getDisplayHint() const { return Hint; }
 
  virtual PathDiagnosticLocation getLocation() const = 0;
  virtual void flattenLocations() = 0;
 
  Kind getKind() const { return kind; }
 
  void addRange(SourceRange R) {
    if (!R.isValid())
      return;
    ranges.push_back(R);
  }
 
  void addRange(SourceLocation B, SourceLocation E) {
    if (!B.isValid() || !E.isValid())
      return;
    ranges.push_back(SourceRange(B,E));
  }
 
  void addFixit(FixItHint F) {
    fixits.push_back(F);
  }
 
  /// Return the SourceRanges associated with this PathDiagnosticPiece.
  ArrayRef<SourceRange> getRanges() const { return ranges; }
 
  /// Return the fix-it hints associated with this PathDiagnosticPiece.
  ArrayRef<FixItHint> getFixits() const { return fixits; }
 
  virtual void Profile(llvm::FoldingSetNodeID &ID) const;
 
  void setAsLastInMainSourceFile() {
    LastInMainSourceFile = true;
  }
 
  bool isLastInMainSourceFile() const {
    return LastInMainSourceFile;
  }
 
  virtual void dump() const = 0;
};
 
using PathDiagnosticPieceRef = std::shared_ptr<PathDiagnosticPiece>;
 
class PathPieces : public std::list<PathDiagnosticPieceRef> {
  void flattenTo(PathPieces &Primary, PathPieces &Current,
                 bool ShouldFlattenMacros) const;
 
public:
  PathPieces flatten(bool ShouldFlattenMacros) const {
    PathPieces Result;
    flattenTo(Result, Result, ShouldFlattenMacros);
    return Result;
  }
 
  void dump() const;
};
 
class PathDiagnosticSpotPiece : public PathDiagnosticPiece {
private:
  PathDiagnosticLocation Pos;
 
public:
  PathDiagnosticSpotPiece(const PathDiagnosticLocation &pos,
                          StringRef s,
                          PathDiagnosticPiece::Kind k,
                          bool addPosRange = true)
      : PathDiagnosticPiece(s, k), Pos(pos) {
    assert(Pos.isValid() && Pos.hasValidLocation() &&
           "PathDiagnosticSpotPiece's must have a valid location.");
    if (addPosRange && Pos.hasRange()) addRange(Pos.asRange());
  }
 
  PathDiagnosticLocation getLocation() const override { return Pos; }
  void flattenLocations() override { Pos.flatten(); }
 
  void Profile(llvm::FoldingSetNodeID &ID) const override;
 
  static bool classof(const PathDiagnosticPiece *P) {
    return P->getKind() == Event || P->getKind() == Macro ||
           P->getKind() == Note || P->getKind() == PopUp;
  }
};
 
class PathDiagnosticEventPiece : public PathDiagnosticSpotPiece {
  std::optional<bool> IsPrunable;
 
public:
  PathDiagnosticEventPiece(const PathDiagnosticLocation &pos,
                           StringRef s, bool addPosRange = true)
      : PathDiagnosticSpotPiece(pos, s, Event, addPosRange) {}
  ~PathDiagnosticEventPiece() override;
 
  /// Mark the diagnostic piece as being potentially prunable.  This
  /// flag may have been previously set, at which point it will not
  /// be reset unless one specifies to do so.
  void setPrunable(bool isPrunable, bool override = false) {
    if (IsPrunable && !override)
      return;
    IsPrunable = isPrunable;
  }
 
  /// Return true if the diagnostic piece is prunable.
  bool isPrunable() const { return IsPrunable.value_or(false); }
 
  void dump() const override;
 
  static bool classof(const PathDiagnosticPiece *P) {
    return P->getKind() == Event;
  }
};
 
class PathDiagnosticCallPiece : public PathDiagnosticPiece {
  const Decl *Caller;
  const Decl *Callee = nullptr;
 
  // Flag signifying that this diagnostic has only call enter and no matching
  // call exit.
  bool NoExit;
 
  // Flag signifying that the callee function is an Objective-C autosynthesized
  // property getter or setter.
  bool IsCalleeAnAutosynthesizedPropertyAccessor = false;
 
  // The custom string, which should appear after the call Return Diagnostic.
  // TODO: Should we allow multiple diagnostics?
  std::string CallStackMessage;
 
  PathDiagnosticCallPiece(const Decl *callerD,
                          const PathDiagnosticLocation &callReturnPos)
      : PathDiagnosticPiece(Call), Caller(callerD), NoExit(false),
        callReturn(callReturnPos) {}
  PathDiagnosticCallPiece(PathPieces &oldPath, const Decl *caller)
      : PathDiagnosticPiece(Call), Caller(caller), NoExit(true),
        path(oldPath) {}
 
public:
  PathDiagnosticLocation callEnter;
  PathDiagnosticLocation callEnterWithin;
  PathDiagnosticLocation callReturn;
  PathPieces path;
 
  ~PathDiagnosticCallPiece() override;
 
  const Decl *getCaller() const { return Caller; }
 
  const Decl *getCallee() const { return Callee; }
  void setCallee(const CallEnter &CE, const SourceManager &SM);
 
  bool hasCallStackMessage() { return !CallStackMessage.empty(); }
  void setCallStackMessage(StringRef st) { CallStackMessage = std::string(st); }
 
  PathDiagnosticLocation getLocation() const override { return callEnter; }
 
  std::shared_ptr<PathDiagnosticEventPiece> getCallEnterEvent() const;
  std::shared_ptr<PathDiagnosticEventPiece>
  getCallEnterWithinCallerEvent() const;
  std::shared_ptr<PathDiagnosticEventPiece> getCallExitEvent() const;
 
  void flattenLocations() override {
    callEnter.flatten();
    callReturn.flatten();
    for (const auto &I : path)
      I->flattenLocations();
  }
 
  static std::shared_ptr<PathDiagnosticCallPiece>
  construct(const CallExitEnd &CE,
            const SourceManager &SM);
 
  static PathDiagnosticCallPiece *construct(PathPieces &pieces,
                                            const Decl *caller);
 
  void dump() const override;
 
  void Profile(llvm::FoldingSetNodeID &ID) const override;
 
  static bool classof(const PathDiagnosticPiece *P) {
    return P->getKind() == Call;
  }
};
 
class PathDiagnosticControlFlowPiece : public PathDiagnosticPiece {
  std::vector<PathDiagnosticLocationPair> LPairs;
 
public:
  PathDiagnosticControlFlowPiece(const PathDiagnosticLocation &startPos,
                                 const PathDiagnosticLocation &endPos,
                                 StringRef s)
      : PathDiagnosticPiece(s, ControlFlow) {
    LPairs.push_back(PathDiagnosticLocationPair(startPos, endPos));
  }
 
  PathDiagnosticControlFlowPiece(const PathDiagnosticLocation &startPos,
                                 const PathDiagnosticLocation &endPos)
      : PathDiagnosticPiece(ControlFlow) {
    LPairs.push_back(PathDiagnosticLocationPair(startPos, endPos));
  }
 
  ~PathDiagnosticControlFlowPiece() override;
 
  PathDiagnosticLocation getStartLocation() const {
    assert(!LPairs.empty() &&
           "PathDiagnosticControlFlowPiece needs at least one location.");
    return LPairs[0].getStart();
  }
 
  PathDiagnosticLocation getEndLocation() const {
    assert(!LPairs.empty() &&
           "PathDiagnosticControlFlowPiece needs at least one location.");
    return LPairs[0].getEnd();
  }
 
  void setStartLocation(const PathDiagnosticLocation &L) {
    LPairs[0].setStart(L);
  }
 
  void setEndLocation(const PathDiagnosticLocation &L) {
    LPairs[0].setEnd(L);
  }
 
  void push_back(const PathDiagnosticLocationPair &X) { LPairs.push_back(X); }
 
  PathDiagnosticLocation getLocation() const override {
    return getStartLocation();
  }
 
  using iterator = std::vector<PathDiagnosticLocationPair>::iterator;
 
  iterator begin() { return LPairs.begin(); }
  iterator end() { return LPairs.end(); }
 
  void flattenLocations() override {
    for (auto &I : *this)
      I.flatten();
  }
 
  using const_iterator =
      std::vector<PathDiagnosticLocationPair>::const_iterator;
 
  const_iterator begin() const { return LPairs.begin(); }
  const_iterator end() const { return LPairs.end(); }
 
  static bool classof(const PathDiagnosticPiece *P) {
    return P->getKind() == ControlFlow;
  }
 
  void dump() const override;
 
  void Profile(llvm::FoldingSetNodeID &ID) const override;
};
 
class PathDiagnosticMacroPiece : public PathDiagnosticSpotPiece {
public:
  PathDiagnosticMacroPiece(const PathDiagnosticLocation &pos)
      : PathDiagnosticSpotPiece(pos, "", Macro) {}
  ~PathDiagnosticMacroPiece() override;
 
  PathPieces subPieces;
 
  void flattenLocations() override {
    PathDiagnosticSpotPiece::flattenLocations();
    for (const auto &I : subPieces)
      I->flattenLocations();
  }
 
  static bool classof(const PathDiagnosticPiece *P) {
    return P->getKind() == Macro;
  }
 
  void dump() const override;
 
  void Profile(llvm::FoldingSetNodeID &ID) const override;
};
 
class PathDiagnosticNotePiece: public PathDiagnosticSpotPiece {
public:
  PathDiagnosticNotePiece(const PathDiagnosticLocation &Pos, StringRef S,
                          bool AddPosRange = true)
      : PathDiagnosticSpotPiece(Pos, S, Note, AddPosRange) {}
  ~PathDiagnosticNotePiece() override;
 
  static bool classof(const PathDiagnosticPiece *P) {
    return P->getKind() == Note;
  }
 
  void dump() const override;
 
  void Profile(llvm::FoldingSetNodeID &ID) const override;
};
 
class PathDiagnosticPopUpPiece: public PathDiagnosticSpotPiece {
public:
  PathDiagnosticPopUpPiece(const PathDiagnosticLocation &Pos, StringRef S,
                           bool AddPosRange = true)
      : PathDiagnosticSpotPiece(Pos, S, PopUp, AddPosRange) {}
  ~PathDiagnosticPopUpPiece() override;
 
  static bool classof(const PathDiagnosticPiece *P) {
    return P->getKind() == PopUp;
  }
 
  void dump() const override;
 
  void Profile(llvm::FoldingSetNodeID &ID) const override;
};
 
/// File IDs mapped to sets of line numbers.
using FilesToLineNumsMap = std::map<FileID, std::set<unsigned>>;
 
/// PathDiagnostic - PathDiagnostic objects represent a single path-sensitive
///  diagnostic.  It represents an ordered-collection of PathDiagnosticPieces,
///  each which represent the pieces of the path.
class PathDiagnostic : public llvm::FoldingSetNode {
  std::string CheckerName;
  const Decl *DeclWithIssue;
  std::string BugType;
  std::string VerboseDesc;
  std::string ShortDesc;
  std::string Category;
  std::deque<std::string> OtherDesc;
 
  /// Loc The location of the path diagnostic report.
  PathDiagnosticLocation Loc;
 
  PathPieces pathImpl;
  SmallVector<PathPieces *, 3> pathStack;
 
  /// Important bug uniqueing location.
  /// The location info is useful to differentiate between bugs.
  PathDiagnosticLocation UniqueingLoc;
  const Decl *UniqueingDecl;
 
  /// The top-level entry point from which this issue was discovered.
  const Decl *AnalysisEntryPoint = nullptr;
 
  /// Lines executed in the path.
  std::unique_ptr<FilesToLineNumsMap> ExecutedLines;
 
public:
  PathDiagnostic() = delete;
  PathDiagnostic(StringRef CheckerName, const Decl *DeclWithIssue,
                 StringRef bugtype, StringRef verboseDesc, StringRef shortDesc,
                 StringRef category, PathDiagnosticLocation LocationToUnique,
                 const Decl *DeclToUnique, const Decl *AnalysisEntryPoint,
                 std::unique_ptr<FilesToLineNumsMap> ExecutedLines);
  ~PathDiagnostic();
 
  const PathPieces &path;
 
  /// Return the path currently used by builders for constructing the
  /// PathDiagnostic.
  PathPieces &getActivePath() {
    if (pathStack.empty())
      return pathImpl;
    return *pathStack.back();
  }
 
  /// Return a mutable version of 'path'.
  PathPieces &getMutablePieces() {
    return pathImpl;
  }
 
  /// Return the unrolled size of the path.
  unsigned full_size();
 
  void pushActivePath(PathPieces *p) { pathStack.push_back(p); }
  void popActivePath() { if (!pathStack.empty()) pathStack.pop_back(); }
 
  bool isWithinCall() const { return !pathStack.empty(); }
 
  void setEndOfPath(PathDiagnosticPieceRef EndPiece) {
    assert(!Loc.isValid() && "End location already set!");
    Loc = EndPiece->getLocation();
    assert(Loc.isValid() && "Invalid location for end-of-path piece");
    getActivePath().push_back(std::move(EndPiece));
  }
 
  void appendToDesc(StringRef S) {
    if (!ShortDesc.empty())
      ShortDesc += S;
    VerboseDesc += S;
  }
 
  StringRef getVerboseDescription() const { return VerboseDesc; }
 
  StringRef getShortDescription() const {
    return ShortDesc.empty() ? VerboseDesc : ShortDesc;
  }
 
  StringRef getCheckerName() const { return CheckerName; }
  StringRef getBugType() const { return BugType; }
  StringRef getCategory() const { return Category; }
 
  using meta_iterator = std::deque<std::string>::const_iterator;
 
  meta_iterator meta_begin() const { return OtherDesc.begin(); }
  meta_iterator meta_end() const { return OtherDesc.end(); }
  void addMeta(StringRef s) { OtherDesc.push_back(std::string(s)); }
 
  const FilesToLineNumsMap &getExecutedLines() const {
    return *ExecutedLines;
  }
 
  FilesToLineNumsMap &getExecutedLines() {
    return *ExecutedLines;
  }
 
  /// Get the top-level entry point from which this issue was discovered.
  const Decl *getAnalysisEntryPoint() const { return AnalysisEntryPoint; }
 
  /// Return the semantic context where an issue occurred.  If the
  /// issue occurs along a path, this represents the "central" area
  /// where the bug manifests.
  const Decl *getDeclWithIssue() const { return DeclWithIssue; }
 
  void setDeclWithIssue(const Decl *D) {
    DeclWithIssue = D;
  }
 
  PathDiagnosticLocation getLocation() const {
    return Loc;
  }
 
  void setLocation(PathDiagnosticLocation NewLoc) {
    Loc = NewLoc;
  }
 
  /// Get the location on which the report should be uniqued.
  PathDiagnosticLocation getUniqueingLoc() const {
    return UniqueingLoc;
  }
 
  /// Get the declaration containing the uniqueing location.
  const Decl *getUniqueingDecl() const {
    return UniqueingDecl;
  }
 
  void flattenLocations() {
    Loc.flatten();
    for (const auto &I : pathImpl)
      I->flattenLocations();
  }
 
  /// Profiles the diagnostic, independent of the path it references.
  ///
  /// This can be used to merge diagnostics that refer to the same issue
  /// along different paths.
  void Profile(llvm::FoldingSetNodeID &ID) const;
 
  /// Profiles the diagnostic, including its path.
  ///
  /// Two diagnostics with the same issue along different paths will generate
  /// different profiles.
  void FullProfile(llvm::FoldingSetNodeID &ID) const;
};
 
} // namespace ento
} // namespace clang
 
#endif // LLVM_CLANG_ANALYSIS_PATHDIAGNOSTIC_H