1 //===--- DiagnosticRenderer.h - Diagnostic Pretty-Printing ------*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
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.
14 //===----------------------------------------------------------------------===//
16 #ifndef LLVM_CLANG_FRONTEND_DIAGNOSTIC_RENDERER_H_
17 #define LLVM_CLANG_FRONTEND_DIAGNOSTIC_RENDERER_H_
19 #include "clang/Basic/Diagnostic.h"
20 #include "clang/Basic/LLVM.h"
21 #include "clang/Basic/SourceLocation.h"
22 #include "llvm/ADT/PointerUnion.h"
26 class DiagnosticOptions;
30 typedef llvm::PointerUnion<const Diagnostic *,
31 const StoredDiagnostic *> DiagOrStoredDiag;
33 /// \brief Class to encapsulate the logic for formatting a diagnostic message.
34 /// Actual "printing" logic is implemented by subclasses.
36 /// This class provides an interface for building and emitting
37 /// diagnostic, including all of the macro backtraces, caret diagnostics, FixIt
38 /// Hints, and code snippets. In the presence of macros this involves
39 /// a recursive process, synthesizing notes for each macro expansion.
42 /// FIXME: Sink the recursive printing of template instantiations into this
44 class DiagnosticRenderer {
46 const SourceManager &SM;
47 const LangOptions &LangOpts;
48 const DiagnosticOptions &DiagOpts;
50 /// \brief The location of the previous diagnostic if known.
52 /// This will be invalid in cases where there is no (known) previous
53 /// diagnostic location, or that location itself is invalid or comes from
54 /// a different source manager than SM.
55 SourceLocation LastLoc;
57 /// \brief The location of the last include whose stack was printed if known.
59 /// Same restriction as \see LastLoc essentially, but tracking include stack
60 /// root locations rather than diagnostic locations.
61 SourceLocation LastIncludeLoc;
63 /// \brief The level of the last diagnostic emitted.
65 /// The level of the last diagnostic emitted. Used to detect level changes
66 /// which change the amount of information displayed.
67 DiagnosticsEngine::Level LastLevel;
69 DiagnosticRenderer(const SourceManager &SM,
70 const LangOptions &LangOpts,
71 const DiagnosticOptions &DiagOpts);
73 virtual ~DiagnosticRenderer();
75 virtual void emitDiagnosticMessage(SourceLocation Loc, PresumedLoc PLoc,
76 DiagnosticsEngine::Level Level,
78 ArrayRef<CharSourceRange> Ranges,
79 DiagOrStoredDiag Info) = 0;
81 virtual void emitDiagnosticLoc(SourceLocation Loc, PresumedLoc PLoc,
82 DiagnosticsEngine::Level Level,
83 ArrayRef<CharSourceRange> Ranges) = 0;
85 virtual void emitBasicNote(StringRef Message) = 0;
87 virtual void emitCodeContext(SourceLocation Loc,
88 DiagnosticsEngine::Level Level,
89 SmallVectorImpl<CharSourceRange>& Ranges,
90 ArrayRef<FixItHint> Hints) = 0;
92 virtual void emitIncludeLocation(SourceLocation Loc, PresumedLoc PLoc) = 0;
94 virtual void beginDiagnostic(DiagOrStoredDiag D,
95 DiagnosticsEngine::Level Level) {}
96 virtual void endDiagnostic(DiagOrStoredDiag D,
97 DiagnosticsEngine::Level Level) {}
101 void emitIncludeStack(SourceLocation Loc, DiagnosticsEngine::Level Level);
102 void emitIncludeStackRecursively(SourceLocation Loc);
103 void emitMacroExpansionsAndCarets(SourceLocation Loc,
104 DiagnosticsEngine::Level Level,
105 SmallVectorImpl<CharSourceRange>& Ranges,
106 ArrayRef<FixItHint> Hints,
107 unsigned &MacroDepth,
108 unsigned OnMacroInst = 0);
110 /// \brief Emit a diagnostic.
112 /// This is the primary entry point for emitting diagnostic messages.
113 /// It handles formatting and rendering the message as well as any ancillary
114 /// information needed based on macros whose expansions impact the
117 /// \param Loc The location for this caret.
118 /// \param Level The level of the diagnostic to be emitted.
119 /// \param Message The diagnostic message to emit.
120 /// \param Ranges The underlined ranges for this code snippet.
121 /// \param FixItHints The FixIt hints active for this diagnostic.
122 void emitDiagnostic(SourceLocation Loc, DiagnosticsEngine::Level Level,
123 StringRef Message, ArrayRef<CharSourceRange> Ranges,
124 ArrayRef<FixItHint> FixItHints,
125 DiagOrStoredDiag D = (Diagnostic *)0);
127 void emitStoredDiagnostic(StoredDiagnostic &Diag);
130 /// Subclass of DiagnosticRender that turns all subdiagostics into explicit
131 /// notes. It is up to subclasses to further define the behavior.
132 class DiagnosticNoteRenderer : public DiagnosticRenderer {
134 DiagnosticNoteRenderer(const SourceManager &SM,
135 const LangOptions &LangOpts,
136 const DiagnosticOptions &DiagOpts)
137 : DiagnosticRenderer(SM, LangOpts, DiagOpts) {}
139 virtual ~DiagnosticNoteRenderer();
141 virtual void emitBasicNote(StringRef Message);
143 virtual void emitIncludeLocation(SourceLocation Loc,
146 virtual void emitNote(SourceLocation Loc, StringRef Message) = 0;
148 } // end clang namespace