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/DiagnosticOptions.h"
21 #include "clang/Basic/LLVM.h"
22 #include "clang/Basic/SourceLocation.h"
23 #include "llvm/ADT/ArrayRef.h"
24 #include "llvm/ADT/IntrusiveRefCntPtr.h"
25 #include "llvm/ADT/PointerUnion.h"
26 #include "llvm/ADT/StringRef.h"
33 using DiagOrStoredDiag =
34 llvm::PointerUnion<const Diagnostic *, const StoredDiagnostic *>;
36 /// Class to encapsulate the logic for formatting a diagnostic message.
38 /// Actual "printing" logic is implemented by subclasses.
40 /// This class provides an interface for building and emitting
41 /// diagnostic, including all of the macro backtraces, caret diagnostics, FixIt
42 /// Hints, and code snippets. In the presence of macros this involves
43 /// a recursive process, synthesizing notes for each macro expansion.
46 /// FIXME: Sink the recursive printing of template instantiations into this
48 class DiagnosticRenderer {
50 const LangOptions &LangOpts;
51 IntrusiveRefCntPtr<DiagnosticOptions> DiagOpts;
53 /// The location of the previous diagnostic if known.
55 /// This will be invalid in cases where there is no (known) previous
56 /// diagnostic location, or that location itself is invalid or comes from
57 /// a different source manager than SM.
58 SourceLocation LastLoc;
60 /// The location of the last include whose stack was printed if known.
62 /// Same restriction as LastLoc essentially, but tracking include stack
63 /// root locations rather than diagnostic locations.
64 SourceLocation LastIncludeLoc;
66 /// The level of the last diagnostic emitted.
68 /// The level of the last diagnostic emitted. Used to detect level changes
69 /// which change the amount of information displayed.
70 DiagnosticsEngine::Level LastLevel = DiagnosticsEngine::Ignored;
72 DiagnosticRenderer(const LangOptions &LangOpts,
73 DiagnosticOptions *DiagOpts);
75 virtual ~DiagnosticRenderer();
77 virtual void emitDiagnosticMessage(FullSourceLoc Loc, PresumedLoc PLoc,
78 DiagnosticsEngine::Level Level,
80 ArrayRef<CharSourceRange> Ranges,
81 DiagOrStoredDiag Info) = 0;
83 virtual void emitDiagnosticLoc(FullSourceLoc Loc, PresumedLoc PLoc,
84 DiagnosticsEngine::Level Level,
85 ArrayRef<CharSourceRange> Ranges) = 0;
87 virtual void emitCodeContext(FullSourceLoc Loc,
88 DiagnosticsEngine::Level Level,
89 SmallVectorImpl<CharSourceRange> &Ranges,
90 ArrayRef<FixItHint> Hints) = 0;
92 virtual void emitIncludeLocation(FullSourceLoc Loc, PresumedLoc PLoc) = 0;
93 virtual void emitImportLocation(FullSourceLoc Loc, PresumedLoc PLoc,
94 StringRef ModuleName) = 0;
95 virtual void emitBuildingModuleLocation(FullSourceLoc Loc, PresumedLoc PLoc,
96 StringRef ModuleName) = 0;
98 virtual void beginDiagnostic(DiagOrStoredDiag D,
99 DiagnosticsEngine::Level Level) {}
100 virtual void endDiagnostic(DiagOrStoredDiag D,
101 DiagnosticsEngine::Level Level) {}
104 void emitBasicNote(StringRef Message);
105 void emitIncludeStack(FullSourceLoc Loc, PresumedLoc PLoc,
106 DiagnosticsEngine::Level Level);
107 void emitIncludeStackRecursively(FullSourceLoc Loc);
108 void emitImportStack(FullSourceLoc Loc);
109 void emitImportStackRecursively(FullSourceLoc Loc, StringRef ModuleName);
110 void emitModuleBuildStack(const SourceManager &SM);
111 void emitCaret(FullSourceLoc Loc, DiagnosticsEngine::Level Level,
112 ArrayRef<CharSourceRange> Ranges, ArrayRef<FixItHint> Hints);
113 void emitSingleMacroExpansion(FullSourceLoc Loc,
114 DiagnosticsEngine::Level Level,
115 ArrayRef<CharSourceRange> Ranges);
116 void emitMacroExpansions(FullSourceLoc Loc, DiagnosticsEngine::Level Level,
117 ArrayRef<CharSourceRange> Ranges,
118 ArrayRef<FixItHint> Hints);
121 /// Emit a diagnostic.
123 /// This is the primary entry point for emitting diagnostic messages.
124 /// It handles formatting and rendering the message as well as any ancillary
125 /// information needed based on macros whose expansions impact the
128 /// \param Loc The location for this caret.
129 /// \param Level The level of the diagnostic to be emitted.
130 /// \param Message The diagnostic message to emit.
131 /// \param Ranges The underlined ranges for this code snippet.
132 /// \param FixItHints The FixIt hints active for this diagnostic.
133 void emitDiagnostic(FullSourceLoc Loc, DiagnosticsEngine::Level Level,
134 StringRef Message, ArrayRef<CharSourceRange> Ranges,
135 ArrayRef<FixItHint> FixItHints,
136 DiagOrStoredDiag D = (Diagnostic *)nullptr);
138 void emitStoredDiagnostic(StoredDiagnostic &Diag);
141 /// Subclass of DiagnosticRender that turns all subdiagostics into explicit
142 /// notes. It is up to subclasses to further define the behavior.
143 class DiagnosticNoteRenderer : public DiagnosticRenderer {
145 DiagnosticNoteRenderer(const LangOptions &LangOpts,
146 DiagnosticOptions *DiagOpts)
147 : DiagnosticRenderer(LangOpts, DiagOpts) {}
149 ~DiagnosticNoteRenderer() override;
151 void emitIncludeLocation(FullSourceLoc Loc, PresumedLoc PLoc) override;
153 void emitImportLocation(FullSourceLoc Loc, PresumedLoc PLoc,
154 StringRef ModuleName) override;
156 void emitBuildingModuleLocation(FullSourceLoc Loc, PresumedLoc PLoc,
157 StringRef ModuleName) override;
159 virtual void emitNote(FullSourceLoc Loc, StringRef Message) = 0;
164 #endif // LLVM_CLANG_FRONTEND_DIAGNOSTICRENDERER_H