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_DIAGNOSTICRENDERER_H
17 #define LLVM_CLANG_FRONTEND_DIAGNOSTICRENDERER_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.
35 /// Actual "printing" logic is implemented by subclasses.
37 /// This class provides an interface for building and emitting
38 /// diagnostic, including all of the macro backtraces, caret diagnostics, FixIt
39 /// Hints, and code snippets. In the presence of macros this involves
40 /// a recursive process, synthesizing notes for each macro expansion.
43 /// FIXME: Sink the recursive printing of template instantiations into this
45 class DiagnosticRenderer {
47 const LangOptions &LangOpts;
48 IntrusiveRefCntPtr<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 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 LangOptions &LangOpts,
70 DiagnosticOptions *DiagOpts);
72 virtual ~DiagnosticRenderer();
74 virtual void emitDiagnosticMessage(FullSourceLoc Loc, PresumedLoc PLoc,
75 DiagnosticsEngine::Level Level,
77 ArrayRef<CharSourceRange> Ranges,
78 DiagOrStoredDiag Info) = 0;
80 virtual void emitDiagnosticLoc(FullSourceLoc Loc, PresumedLoc PLoc,
81 DiagnosticsEngine::Level Level,
82 ArrayRef<CharSourceRange> Ranges) = 0;
84 virtual void emitCodeContext(FullSourceLoc Loc,
85 DiagnosticsEngine::Level Level,
86 SmallVectorImpl<CharSourceRange> &Ranges,
87 ArrayRef<FixItHint> Hints) = 0;
89 virtual void emitIncludeLocation(FullSourceLoc Loc, PresumedLoc PLoc) = 0;
90 virtual void emitImportLocation(FullSourceLoc Loc, PresumedLoc PLoc,
91 StringRef ModuleName) = 0;
92 virtual void emitBuildingModuleLocation(FullSourceLoc Loc, PresumedLoc PLoc,
93 StringRef ModuleName) = 0;
95 virtual void beginDiagnostic(DiagOrStoredDiag D,
96 DiagnosticsEngine::Level Level) {}
97 virtual void endDiagnostic(DiagOrStoredDiag D,
98 DiagnosticsEngine::Level Level) {}
102 void emitBasicNote(StringRef Message);
103 void emitIncludeStack(FullSourceLoc Loc, PresumedLoc PLoc,
104 DiagnosticsEngine::Level Level);
105 void emitIncludeStackRecursively(FullSourceLoc Loc);
106 void emitImportStack(FullSourceLoc Loc);
107 void emitImportStackRecursively(FullSourceLoc Loc, StringRef ModuleName);
108 void emitModuleBuildStack(const SourceManager &SM);
109 void emitCaret(FullSourceLoc Loc, DiagnosticsEngine::Level Level,
110 ArrayRef<CharSourceRange> Ranges, ArrayRef<FixItHint> Hints);
111 void emitSingleMacroExpansion(FullSourceLoc Loc,
112 DiagnosticsEngine::Level Level,
113 ArrayRef<CharSourceRange> Ranges);
114 void emitMacroExpansions(FullSourceLoc Loc, DiagnosticsEngine::Level Level,
115 ArrayRef<CharSourceRange> Ranges,
116 ArrayRef<FixItHint> Hints);
119 /// \brief Emit a diagnostic.
121 /// This is the primary entry point for emitting diagnostic messages.
122 /// It handles formatting and rendering the message as well as any ancillary
123 /// information needed based on macros whose expansions impact the
126 /// \param Loc The location for this caret.
127 /// \param Level The level of the diagnostic to be emitted.
128 /// \param Message The diagnostic message to emit.
129 /// \param Ranges The underlined ranges for this code snippet.
130 /// \param FixItHints The FixIt hints active for this diagnostic.
131 void emitDiagnostic(FullSourceLoc Loc, DiagnosticsEngine::Level Level,
132 StringRef Message, ArrayRef<CharSourceRange> Ranges,
133 ArrayRef<FixItHint> FixItHints,
134 DiagOrStoredDiag D = (Diagnostic *)nullptr);
136 void emitStoredDiagnostic(StoredDiagnostic &Diag);
139 /// Subclass of DiagnosticRender that turns all subdiagostics into explicit
140 /// notes. It is up to subclasses to further define the behavior.
141 class DiagnosticNoteRenderer : public DiagnosticRenderer {
143 DiagnosticNoteRenderer(const LangOptions &LangOpts,
144 DiagnosticOptions *DiagOpts)
145 : DiagnosticRenderer(LangOpts, DiagOpts) {}
147 ~DiagnosticNoteRenderer() override;
149 void emitIncludeLocation(FullSourceLoc Loc, PresumedLoc PLoc) override;
151 void emitImportLocation(FullSourceLoc Loc, PresumedLoc PLoc,
152 StringRef ModuleName) override;
154 void emitBuildingModuleLocation(FullSourceLoc Loc, PresumedLoc PLoc,
155 StringRef ModuleName) override;
157 virtual void emitNote(FullSourceLoc Loc, StringRef Message) = 0;
159 } // end clang namespace