clang 19.0.0git
MacroPPCallbacks.cpp
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1//===--- MacroPPCallbacks.cpp ---------------------------------------------===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8//
9// This file contains implementation for the macro preprocessors callbacks.
10//
11//===----------------------------------------------------------------------===//
12
13#include "MacroPPCallbacks.h"
14#include "CGDebugInfo.h"
16#include "clang/Lex/MacroInfo.h"
18
19using namespace clang;
20
21void MacroPPCallbacks::writeMacroDefinition(const IdentifierInfo &II,
22 const MacroInfo &MI,
23 Preprocessor &PP, raw_ostream &Name,
24 raw_ostream &Value) {
25 Name << II.getName();
26
27 if (MI.isFunctionLike()) {
28 Name << '(';
29 if (!MI.param_empty()) {
31 for (; AI + 1 != E; ++AI) {
32 Name << (*AI)->getName();
33 Name << ',';
34 }
35
36 // Last argument.
37 if ((*AI)->getName() == "__VA_ARGS__")
38 Name << "...";
39 else
40 Name << (*AI)->getName();
41 }
42
43 if (MI.isGNUVarargs())
44 // #define foo(x...)
45 Name << "...";
46
47 Name << ')';
48 }
49
50 SmallString<128> SpellingBuffer;
51 bool First = true;
52 for (const auto &T : MI.tokens()) {
53 if (!First && T.hasLeadingSpace())
54 Value << ' ';
55
56 Value << PP.getSpelling(T, SpellingBuffer);
57 First = false;
58 }
59}
60
62 : Gen(Gen), PP(PP), Status(NoScope) {}
63
64// This is the expected flow of enter/exit compiler and user files:
65// - Main File Enter
66// - <built-in> file enter
67// {Compiler macro definitions} - (Line=0, no scope)
68// - (Optional) <command line> file enter
69// {Command line macro definitions} - (Line=0, no scope)
70// - (Optional) <command line> file exit
71// {Command line file includes} - (Line=0, Main file scope)
72// {macro definitions and file includes} - (Line!=0, Parent scope)
73// - <built-in> file exit
74// {User code macro definitions and file includes} - (Line!=0, Parent scope)
75
76llvm::DIMacroFile *MacroPPCallbacks::getCurrentScope() {
77 if (Status == MainFileScope || Status == CommandLineIncludeScope)
78 return Scopes.back();
79 return nullptr;
80}
81
82SourceLocation MacroPPCallbacks::getCorrectLocation(SourceLocation Loc) {
83 if (Status == MainFileScope || EnteredCommandLineIncludeFiles)
84 return Loc;
85
86 // While parsing skipped files, location of macros is invalid.
87 // Invalid location represents line zero.
88 return SourceLocation();
89}
90
91void MacroPPCallbacks::updateStatusToNextScope() {
92 switch (Status) {
93 case NoScope:
94 Status = InitializedScope;
95 break;
96 case InitializedScope:
97 Status = BuiltinScope;
98 break;
99 case BuiltinScope:
100 Status = CommandLineIncludeScope;
101 break;
102 case CommandLineIncludeScope:
103 Status = MainFileScope;
104 break;
105 case MainFileScope:
106 llvm_unreachable("There is no next scope, already in the final scope");
107 }
108}
109
110void MacroPPCallbacks::FileEntered(SourceLocation Loc) {
111 SourceLocation LineLoc = getCorrectLocation(LastHashLoc);
112 switch (Status) {
113 case NoScope:
114 updateStatusToNextScope();
115 break;
116 case InitializedScope:
117 updateStatusToNextScope();
118 return;
119 case BuiltinScope:
121 return;
122 updateStatusToNextScope();
123 [[fallthrough]];
124 case CommandLineIncludeScope:
125 EnteredCommandLineIncludeFiles++;
126 break;
127 case MainFileScope:
128 break;
129 }
130
131 Scopes.push_back(Gen->getCGDebugInfo()->CreateTempMacroFile(getCurrentScope(),
132 LineLoc, Loc));
133}
134
135void MacroPPCallbacks::FileExited(SourceLocation Loc) {
136 switch (Status) {
137 default:
138 llvm_unreachable("Do not expect to exit a file from current scope");
139 case BuiltinScope:
141 // Skip next scope and change status to MainFileScope.
142 Status = MainFileScope;
143 return;
144 case CommandLineIncludeScope:
145 if (!EnteredCommandLineIncludeFiles) {
146 updateStatusToNextScope();
147 return;
148 }
149 EnteredCommandLineIncludeFiles--;
150 break;
151 case MainFileScope:
152 break;
153 }
154
155 Scopes.pop_back();
156}
157
160 FileID PrevFID) {
161 // Only care about enter file or exit file changes.
162 if (Reason == EnterFile)
163 FileEntered(Loc);
164 else if (Reason == ExitFile)
165 FileExited(Loc);
166}
167
169 SourceLocation HashLoc, const Token &IncludeTok, StringRef FileName,
170 bool IsAngled, CharSourceRange FilenameRange, OptionalFileEntryRef File,
171 StringRef SearchPath, StringRef RelativePath, const Module *SuggestedModule,
172 bool ModuleImported, SrcMgr::CharacteristicKind FileType) {
173
174 // Record the line location of the current included file.
175 LastHashLoc = HashLoc;
176}
177
178void MacroPPCallbacks::MacroDefined(const Token &MacroNameTok,
179 const MacroDirective *MD) {
180 IdentifierInfo *Id = MacroNameTok.getIdentifierInfo();
181 SourceLocation location = getCorrectLocation(MacroNameTok.getLocation());
182 std::string NameBuffer, ValueBuffer;
183 llvm::raw_string_ostream Name(NameBuffer);
184 llvm::raw_string_ostream Value(ValueBuffer);
185 writeMacroDefinition(*Id, *MD->getMacroInfo(), PP, Name, Value);
186 Gen->getCGDebugInfo()->CreateMacro(getCurrentScope(),
187 llvm::dwarf::DW_MACINFO_define, location,
188 Name.str(), Value.str());
189}
190
192 const MacroDefinition &MD,
193 const MacroDirective *Undef) {
194 IdentifierInfo *Id = MacroNameTok.getIdentifierInfo();
195 SourceLocation location = getCorrectLocation(MacroNameTok.getLocation());
196 Gen->getCGDebugInfo()->CreateMacro(getCurrentScope(),
197 llvm::dwarf::DW_MACINFO_undef, location,
198 Id->getName(), "");
199}
int Id
Definition: ASTDiff.cpp:190
llvm::MachO::FileType FileType
Definition: MachO.h:45
Defines the clang::MacroInfo and clang::MacroDirective classes.
Defines the clang::Preprocessor interface.
SourceLocation Loc
Definition: SemaObjC.cpp:755
Represents a character-granular source range.
llvm::DIMacroFile * CreateTempMacroFile(llvm::DIMacroFile *Parent, SourceLocation LineLoc, SourceLocation FileLoc)
Create debug info for a file referenced by an #include directive.
llvm::DIMacro * CreateMacro(llvm::DIMacroFile *Parent, unsigned MType, SourceLocation LineLoc, StringRef Name, StringRef Value)
Create debug info for a macro defined by a #define directive or a macro undefined by a #undef directi...
The primary public interface to the Clang code generator.
Definition: ModuleBuilder.h:48
CodeGen::CGDebugInfo * getCGDebugInfo()
Return debug info code generator.
An opaque identifier used by SourceManager which refers to a source file (MemoryBuffer) along with it...
One of these records is kept for each identifier that is lexed.
StringRef getName() const
Return the actual identifier string.
A description of the current definition of a macro.
Definition: MacroInfo.h:590
Encapsulates changes to the "macros namespace" (the location where the macro name became active,...
Definition: MacroInfo.h:313
const MacroInfo * getMacroInfo() const
Definition: MacroInfo.h:416
Encapsulates the data about a macro definition (e.g.
Definition: MacroInfo.h:39
bool isFunctionLike() const
Definition: MacroInfo.h:201
param_iterator param_begin() const
Definition: MacroInfo.h:182
IdentifierInfo *const * param_iterator
Parameters - The list of parameters for a function-like macro.
Definition: MacroInfo.h:180
param_iterator param_end() const
Definition: MacroInfo.h:183
bool param_empty() const
Definition: MacroInfo.h:181
ArrayRef< Token > tokens() const
Definition: MacroInfo.h:249
bool isGNUVarargs() const
Definition: MacroInfo.h:208
void MacroUndefined(const Token &MacroNameTok, const MacroDefinition &MD, const MacroDirective *Undef) override
Hook called whenever a macro #undef is seen.
void InclusionDirective(SourceLocation HashLoc, const Token &IncludeTok, StringRef FileName, bool IsAngled, CharSourceRange FilenameRange, OptionalFileEntryRef File, StringRef SearchPath, StringRef RelativePath, const Module *SuggestedModule, bool ModuleImported, SrcMgr::CharacteristicKind FileType) override
Callback invoked whenever a directive (#xxx) is processed.
void MacroDefined(const Token &MacroNameTok, const MacroDirective *MD) override
Hook called whenever a macro definition is seen.
void FileChanged(SourceLocation Loc, FileChangeReason Reason, SrcMgr::CharacteristicKind FileType, FileID PrevFID=FileID()) override
Callback invoked whenever a source file is entered or exited.
MacroPPCallbacks(CodeGenerator *Gen, Preprocessor &PP)
Describes a module or submodule.
Definition: Module.h:105
Engages in a tight little dance with the lexer to efficiently preprocess tokens.
Definition: Preprocessor.h:128
SourceManager & getSourceManager() const
StringRef getSpelling(SourceLocation loc, SmallVectorImpl< char > &buffer, bool *invalid=nullptr) const
Return the 'spelling' of the token at the given location; does not go up to the spelling location or ...
Encodes a location in the source.
bool isWrittenInBuiltinFile(SourceLocation Loc) const
Returns whether Loc is located in a <built-in> file.
bool isWrittenInCommandLineFile(SourceLocation Loc) const
Returns whether Loc is located in a <command line> file.
Token - This structure provides full information about a lexed token.
Definition: Token.h:36
IdentifierInfo * getIdentifierInfo() const
Definition: Token.h:187
SourceLocation getLocation() const
Return a source location identifier for the specified offset in the current file.
Definition: Token.h:132
CharacteristicKind
Indicates whether a file or directory holds normal user code, system code, or system code which is im...
Definition: SourceManager.h:81
The JSON file list parser is used to communicate input to InstallAPI.
const FunctionProtoType * T