clang  3.7.0
DiagnosticRenderer.h
Go to the documentation of this file.
1 //===--- DiagnosticRenderer.h - Diagnostic Pretty-Printing ------*- C++ -*-===//
2 //
3 // The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 //
10 // This is a utility class that provides support for pretty-printing of
11 // diagnostics. It is used to implement the different code paths which require
12 // such functionality in a consistent way.
13 //
14 //===----------------------------------------------------------------------===//
15 
16 #ifndef LLVM_CLANG_FRONTEND_DIAGNOSTICRENDERER_H
17 #define LLVM_CLANG_FRONTEND_DIAGNOSTICRENDERER_H
18 
19 #include "clang/Basic/Diagnostic.h"
20 #include "clang/Basic/LLVM.h"
22 #include "llvm/ADT/Optional.h"
23 #include "llvm/ADT/PointerUnion.h"
24 
25 namespace clang {
26 
27 class DiagnosticOptions;
28 class LangOptions;
30 
31 typedef llvm::PointerUnion<const Diagnostic *,
33 
34 /// \brief Class to encapsulate the logic for formatting a diagnostic message.
35 ///
36 /// Actual "printing" logic is implemented by subclasses.
37 ///
38 /// This class provides an interface for building and emitting
39 /// diagnostic, including all of the macro backtraces, caret diagnostics, FixIt
40 /// Hints, and code snippets. In the presence of macros this involves
41 /// a recursive process, synthesizing notes for each macro expansion.
42 ///
43 /// A brief worklist:
44 /// FIXME: Sink the recursive printing of template instantiations into this
45 /// class.
47 protected:
50 
51  /// \brief The location of the previous diagnostic if known.
52  ///
53  /// This will be invalid in cases where there is no (known) previous
54  /// diagnostic location, or that location itself is invalid or comes from
55  /// a different source manager than SM.
57 
58  /// \brief The location of the last include whose stack was printed if known.
59  ///
60  /// Same restriction as LastLoc essentially, but tracking include stack
61  /// root locations rather than diagnostic locations.
63 
64  /// \brief The level of the last diagnostic emitted.
65  ///
66  /// The level of the last diagnostic emitted. Used to detect level changes
67  /// which change the amount of information displayed.
69 
72 
73  virtual ~DiagnosticRenderer();
74 
75  virtual void emitDiagnosticMessage(SourceLocation Loc, PresumedLoc PLoc,
77  StringRef Message,
79  const SourceManager *SM,
80  DiagOrStoredDiag Info) = 0;
81 
82  virtual void emitDiagnosticLoc(SourceLocation Loc, PresumedLoc PLoc,
85  const SourceManager &SM) = 0;
86 
87  virtual void emitCodeContext(SourceLocation Loc,
90  ArrayRef<FixItHint> Hints,
91  const SourceManager &SM) = 0;
92 
93  virtual void emitIncludeLocation(SourceLocation Loc, PresumedLoc PLoc,
94  const SourceManager &SM) = 0;
95  virtual void emitImportLocation(SourceLocation Loc, PresumedLoc PLoc,
96  StringRef ModuleName,
97  const SourceManager &SM) = 0;
99  StringRef ModuleName,
100  const SourceManager &SM) = 0;
101 
106 
107 
108 private:
109  void emitBasicNote(StringRef Message);
110  void emitIncludeStack(SourceLocation Loc, PresumedLoc PLoc,
112  void emitIncludeStackRecursively(SourceLocation Loc, const SourceManager &SM);
113  void emitImportStack(SourceLocation Loc, const SourceManager &SM);
114  void emitImportStackRecursively(SourceLocation Loc, StringRef ModuleName,
115  const SourceManager &SM);
116  void emitModuleBuildStack(const SourceManager &SM);
117  void emitCaret(SourceLocation Loc, DiagnosticsEngine::Level Level,
119  const SourceManager &SM);
120  void emitMacroExpansions(SourceLocation Loc,
123  ArrayRef<FixItHint> Hints,
124  const SourceManager &SM,
125  unsigned &MacroDepth,
126  unsigned OnMacroInst = 0);
127 public:
128  /// \brief Emit a diagnostic.
129  ///
130  /// This is the primary entry point for emitting diagnostic messages.
131  /// It handles formatting and rendering the message as well as any ancillary
132  /// information needed based on macros whose expansions impact the
133  /// diagnostic.
134  ///
135  /// \param Loc The location for this caret.
136  /// \param Level The level of the diagnostic to be emitted.
137  /// \param Message The diagnostic message to emit.
138  /// \param Ranges The underlined ranges for this code snippet.
139  /// \param FixItHints The FixIt hints active for this diagnostic.
140  /// \param SM The SourceManager; will be null if the diagnostic came from the
141  /// frontend, thus \p Loc will be invalid.
143  StringRef Message, ArrayRef<CharSourceRange> Ranges,
144  ArrayRef<FixItHint> FixItHints,
145  const SourceManager *SM,
146  DiagOrStoredDiag D = (Diagnostic *)nullptr);
147 
149 };
150 
151 /// Subclass of DiagnosticRender that turns all subdiagostics into explicit
152 /// notes. It is up to subclasses to further define the behavior.
154 public:
157  : DiagnosticRenderer(LangOpts, DiagOpts) {}
158 
159  ~DiagnosticNoteRenderer() override;
160 
162  const SourceManager &SM) override;
163 
165  StringRef ModuleName,
166  const SourceManager &SM) override;
167 
169  StringRef ModuleName,
170  const SourceManager &SM) override;
171 
172  virtual void emitNote(SourceLocation Loc, StringRef Message,
173  const SourceManager *SM) = 0;
174 };
175 } // end clang namespace
176 #endif
static DiagnosticBuilder Diag(DiagnosticsEngine *Diags, const LangOptions &Features, FullSourceLoc TokLoc, const char *TokBegin, const char *TokRangeBegin, const char *TokRangeEnd, unsigned DiagID)
Produce a diagnostic highlighting some portion of a literal.
void emitDiagnostic(SourceLocation Loc, DiagnosticsEngine::Level Level, StringRef Message, ArrayRef< CharSourceRange > Ranges, ArrayRef< FixItHint > FixItHints, const SourceManager *SM, DiagOrStoredDiag D=(Diagnostic *) nullptr)
Emit a diagnostic.
virtual void emitBuildingModuleLocation(SourceLocation Loc, PresumedLoc PLoc, StringRef ModuleName, const SourceManager &SM)=0
Represents a diagnostic in a form that can be retained until its corresponding source manager is dest...
Definition: Diagnostic.h:1258
void emitStoredDiagnostic(StoredDiagnostic &Diag)
const LangOptions & LangOpts
virtual void emitDiagnosticMessage(SourceLocation Loc, PresumedLoc PLoc, DiagnosticsEngine::Level Level, StringRef Message, ArrayRef< CharSourceRange > Ranges, const SourceManager *SM, DiagOrStoredDiag Info)=0
Keeps track of the various options that can be enabled, which controls the dialect of C or C++ that i...
Definition: LangOptions.h:48
Class to encapsulate the logic for formatting a diagnostic message.
SmallVector< CharSourceRange, 8 > Ranges
Definition: Format.cpp:1554
Forward-declares and imports various common LLVM datatypes that clang wants to use unqualified...
void emitImportLocation(SourceLocation Loc, PresumedLoc PLoc, StringRef ModuleName, const SourceManager &SM) override
DiagnosticsEngine::Level LastLevel
The level of the last diagnostic emitted.
void emitIncludeLocation(SourceLocation Loc, PresumedLoc PLoc, const SourceManager &SM) override
SourceManager & SM
IntrusiveRefCntPtr< DiagnosticOptions > DiagOpts
DiagnosticNoteRenderer(const LangOptions &LangOpts, DiagnosticOptions *DiagOpts)
Represents an unpacked "presumed" location which can be presented to the user.
virtual void emitCodeContext(SourceLocation Loc, DiagnosticsEngine::Level Level, SmallVectorImpl< CharSourceRange > &Ranges, ArrayRef< FixItHint > Hints, const SourceManager &SM)=0
llvm::PointerUnion< const Diagnostic *, const StoredDiagnostic * > DiagOrStoredDiag
Encodes a location in the source. The SourceManager can decode this to get at the full include stack...
Options for controlling the compiler diagnostics engine.
virtual void beginDiagnostic(DiagOrStoredDiag D, DiagnosticsEngine::Level Level)
virtual void emitIncludeLocation(SourceLocation Loc, PresumedLoc PLoc, const SourceManager &SM)=0
DiagnosticRenderer(const LangOptions &LangOpts, DiagnosticOptions *DiagOpts)
SourceLocation LastLoc
The location of the previous diagnostic if known.
virtual void emitDiagnosticLoc(SourceLocation Loc, PresumedLoc PLoc, DiagnosticsEngine::Level Level, ArrayRef< CharSourceRange > Ranges, const SourceManager &SM)=0
SourceLocation LastIncludeLoc
The location of the last include whose stack was printed if known.
virtual void endDiagnostic(DiagOrStoredDiag D, DiagnosticsEngine::Level Level)
virtual void emitNote(SourceLocation Loc, StringRef Message, const SourceManager *SM)=0
Defines the Diagnostic-related interfaces.
void emitBuildingModuleLocation(SourceLocation Loc, PresumedLoc PLoc, StringRef ModuleName, const SourceManager &SM) override
Defines the clang::SourceLocation class and associated facilities.
Level
The level of the diagnostic, after it has been through mapping.
Definition: Diagnostic.h:141
virtual void emitImportLocation(SourceLocation Loc, PresumedLoc PLoc, StringRef ModuleName, const SourceManager &SM)=0
This class handles loading and caching of source files into memory.