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 LangOptions &LangOpts;
47 IntrusiveRefCntPtr<DiagnosticOptions> DiagOpts;
49 /// \brief The location of the previous diagnostic if known.
51 /// This will be invalid in cases where there is no (known) previous
52 /// diagnostic location, or that location itself is invalid or comes from
53 /// a different source manager than SM.
54 SourceLocation LastLoc;
56 /// \brief The location of the last include whose stack was printed if known.
58 /// Same restriction as \see LastLoc essentially, but tracking include stack
59 /// root locations rather than diagnostic locations.
60 SourceLocation LastIncludeLoc;
62 /// \brief The level of the last diagnostic emitted.
64 /// The level of the last diagnostic emitted. Used to detect level changes
65 /// which change the amount of information displayed.
66 DiagnosticsEngine::Level LastLevel;
68 DiagnosticRenderer(const LangOptions &LangOpts,
69 DiagnosticOptions *DiagOpts);
71 virtual ~DiagnosticRenderer();
73 virtual void emitDiagnosticMessage(SourceLocation Loc, PresumedLoc PLoc,
74 DiagnosticsEngine::Level Level,
76 ArrayRef<CharSourceRange> Ranges,
77 const SourceManager *SM,
78 DiagOrStoredDiag Info) = 0;
80 virtual void emitDiagnosticLoc(SourceLocation Loc, PresumedLoc PLoc,
81 DiagnosticsEngine::Level Level,
82 ArrayRef<CharSourceRange> Ranges,
83 const SourceManager &SM) = 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,
91 const SourceManager &SM) = 0;
93 virtual void emitIncludeLocation(SourceLocation Loc, PresumedLoc PLoc,
94 const SourceManager &SM) = 0;
96 virtual void beginDiagnostic(DiagOrStoredDiag D,
97 DiagnosticsEngine::Level Level) {}
98 virtual void endDiagnostic(DiagOrStoredDiag D,
99 DiagnosticsEngine::Level Level) {}
103 void emitIncludeStack(SourceLocation Loc, DiagnosticsEngine::Level Level,
104 const SourceManager &SM);
105 void emitIncludeStackRecursively(SourceLocation Loc, const SourceManager &SM);
106 void emitMacroExpansionsAndCarets(SourceLocation Loc,
107 DiagnosticsEngine::Level Level,
108 SmallVectorImpl<CharSourceRange>& Ranges,
109 ArrayRef<FixItHint> Hints,
110 const SourceManager &SM,
111 unsigned &MacroDepth,
112 unsigned OnMacroInst = 0);
114 /// \brief Emit a diagnostic.
116 /// This is the primary entry point for emitting diagnostic messages.
117 /// It handles formatting and rendering the message as well as any ancillary
118 /// information needed based on macros whose expansions impact the
121 /// \param Loc The location for this caret.
122 /// \param Level The level of the diagnostic to be emitted.
123 /// \param Message The diagnostic message to emit.
124 /// \param Ranges The underlined ranges for this code snippet.
125 /// \param FixItHints The FixIt hints active for this diagnostic.
126 /// \param SM The SourceManager; will be null if the diagnostic came from the
127 /// frontend, thus \p Loc will be invalid.
128 void emitDiagnostic(SourceLocation Loc, DiagnosticsEngine::Level Level,
129 StringRef Message, ArrayRef<CharSourceRange> Ranges,
130 ArrayRef<FixItHint> FixItHints,
131 const SourceManager *SM,
132 DiagOrStoredDiag D = (Diagnostic *)0);
134 void emitStoredDiagnostic(StoredDiagnostic &Diag);
137 /// Subclass of DiagnosticRender that turns all subdiagostics into explicit
138 /// notes. It is up to subclasses to further define the behavior.
139 class DiagnosticNoteRenderer : public DiagnosticRenderer {
141 DiagnosticNoteRenderer(const LangOptions &LangOpts,
142 DiagnosticOptions *DiagOpts)
143 : DiagnosticRenderer(LangOpts, DiagOpts) {}
145 virtual ~DiagnosticNoteRenderer();
147 virtual void emitBasicNote(StringRef Message);
149 virtual void emitIncludeLocation(SourceLocation Loc,
151 const SourceManager &SM);
153 virtual void emitNote(SourceLocation Loc, StringRef Message,
154 const SourceManager *SM) = 0;
156 } // end clang namespace