clang  12.0.0git
RenamingAction.cpp
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1 //===--- RenamingAction.cpp - Clang refactoring library -------------------===//
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 /// \file
10 /// Provides an action to rename every symbol at a point.
11 ///
12 //===----------------------------------------------------------------------===//
13 
15 #include "clang/AST/ASTConsumer.h"
16 #include "clang/AST/ASTContext.h"
20 #include "clang/Lex/Lexer.h"
21 #include "clang/Lex/Preprocessor.h"
31 #include "clang/Tooling/Tooling.h"
32 #include "llvm/ADT/STLExtras.h"
33 #include "llvm/Support/Errc.h"
34 #include "llvm/Support/Error.h"
35 #include <string>
36 #include <vector>
37 
38 using namespace llvm;
39 
40 namespace clang {
41 namespace tooling {
42 
43 namespace {
44 
46 findSymbolOccurrences(const NamedDecl *ND, RefactoringRuleContext &Context) {
47  std::vector<std::string> USRs =
48  getUSRsForDeclaration(ND, Context.getASTContext());
49  std::string PrevName = ND->getNameAsString();
50  return getOccurrencesOfUSRs(USRs, PrevName,
51  Context.getASTContext().getTranslationUnitDecl());
52 }
53 
54 } // end anonymous namespace
55 
56 const RefactoringDescriptor &RenameOccurrences::describe() {
57  static const RefactoringDescriptor Descriptor = {
58  "local-rename",
59  "Rename",
60  "Finds and renames symbols in code with no indexer support",
61  };
62  return Descriptor;
63 }
64 
66 RenameOccurrences::initiate(RefactoringRuleContext &Context,
67  SourceRange SelectionRange, std::string NewName) {
68  const NamedDecl *ND =
69  getNamedDeclAt(Context.getASTContext(), SelectionRange.getBegin());
70  if (!ND)
71  return Context.createDiagnosticError(
72  SelectionRange.getBegin(), diag::err_refactor_selection_no_symbol);
74  std::move(NewName));
75 }
76 
77 const NamedDecl *RenameOccurrences::getRenameDecl() const { return ND; }
78 
80 RenameOccurrences::createSourceReplacements(RefactoringRuleContext &Context) {
81  Expected<SymbolOccurrences> Occurrences = findSymbolOccurrences(ND, Context);
82  if (!Occurrences)
83  return Occurrences.takeError();
84  // FIXME: Verify that the new name is valid.
85  SymbolName Name(NewName);
87  *Occurrences, Context.getASTContext().getSourceManager(), Name);
88 }
89 
91 QualifiedRenameRule::initiate(RefactoringRuleContext &Context,
92  std::string OldQualifiedName,
93  std::string NewQualifiedName) {
94  const NamedDecl *ND =
95  getNamedDeclFor(Context.getASTContext(), OldQualifiedName);
96  if (!ND)
97  return llvm::make_error<llvm::StringError>("Could not find symbol " +
98  OldQualifiedName,
99  llvm::errc::invalid_argument);
100  return QualifiedRenameRule(ND, std::move(NewQualifiedName));
101 }
102 
103 const RefactoringDescriptor &QualifiedRenameRule::describe() {
104  static const RefactoringDescriptor Descriptor = {
105  /*Name=*/"local-qualified-rename",
106  /*Title=*/"Qualified Rename",
107  /*Description=*/
108  R"(Finds and renames qualified symbols in code within a translation unit.
109 It is used to move/rename a symbol to a new namespace/name:
110  * Supported symbols: classes, class members, functions, enums, and type alias.
111  * Renames all symbol occurrences from the old qualified name to the new
112  qualified name. All symbol references will be correctly qualified; For
113  symbol definitions, only name will be changed.
114 For example, rename "A::Foo" to "B::Bar":
115  Old code:
116  namespace foo {
117  class A {};
118  }
119 
120  namespace bar {
121  void f(foo::A a) {}
122  }
123 
124  New code after rename:
125  namespace foo {
126  class B {};
127  }
128 
129  namespace bar {
130  void f(B b) {}
131  })"
132  };
133  return Descriptor;
134 }
135 
137 QualifiedRenameRule::createSourceReplacements(RefactoringRuleContext &Context) {
138  auto USRs = getUSRsForDeclaration(ND, Context.getASTContext());
139  assert(!USRs.empty());
141  USRs, NewQualifiedName, Context.getASTContext().getTranslationUnitDecl());
142 }
143 
146  const SourceManager &SM, const SymbolName &NewName) {
147  // FIXME: A true local rename can use just one AtomicChange.
148  std::vector<AtomicChange> Changes;
149  for (const auto &Occurrence : Occurrences) {
150  ArrayRef<SourceRange> Ranges = Occurrence.getNameRanges();
151  assert(NewName.getNamePieces().size() == Ranges.size() &&
152  "Mismatching number of ranges and name pieces");
153  AtomicChange Change(SM, Ranges[0].getBegin());
154  for (const auto &Range : llvm::enumerate(Ranges)) {
155  auto Error =
156  Change.replace(SM, CharSourceRange::getCharRange(Range.value()),
157  NewName.getNamePieces()[Range.index()]);
158  if (Error)
159  return std::move(Error);
160  }
161  Changes.push_back(std::move(Change));
162  }
163  return std::move(Changes);
164 }
165 
166 /// Takes each atomic change and inserts its replacements into the set of
167 /// replacements that belong to the appropriate file.
170  std::map<std::string, tooling::Replacements> *FileToReplaces) {
171  for (const auto &AtomicChange : AtomicChanges) {
172  for (const auto &Replace : AtomicChange.getReplacements()) {
173  llvm::Error Err =
174  (*FileToReplaces)[std::string(Replace.getFilePath())].add(Replace);
175  if (Err) {
176  llvm::errs() << "Renaming failed in " << Replace.getFilePath() << "! "
177  << llvm::toString(std::move(Err)) << "\n";
178  }
179  }
180  }
181 }
182 
184 public:
186  const std::vector<std::string> &NewNames,
187  const std::vector<std::string> &PrevNames,
188  const std::vector<std::vector<std::string>> &USRList,
189  std::map<std::string, tooling::Replacements> &FileToReplaces,
190  bool PrintLocations)
191  : NewNames(NewNames), PrevNames(PrevNames), USRList(USRList),
192  FileToReplaces(FileToReplaces), PrintLocations(PrintLocations) {}
193 
194  void HandleTranslationUnit(ASTContext &Context) override {
195  for (unsigned I = 0; I < NewNames.size(); ++I) {
196  // If the previous name was not found, ignore this rename request.
197  if (PrevNames[I].empty())
198  continue;
199 
200  HandleOneRename(Context, NewNames[I], PrevNames[I], USRList[I]);
201  }
202  }
203 
204  void HandleOneRename(ASTContext &Context, const std::string &NewName,
205  const std::string &PrevName,
206  const std::vector<std::string> &USRs) {
207  const SourceManager &SourceMgr = Context.getSourceManager();
208 
210  USRs, PrevName, Context.getTranslationUnitDecl());
211  if (PrintLocations) {
212  for (const auto &Occurrence : Occurrences) {
213  FullSourceLoc FullLoc(Occurrence.getNameRanges()[0].getBegin(),
214  SourceMgr);
215  errs() << "clang-rename: renamed at: " << SourceMgr.getFilename(FullLoc)
216  << ":" << FullLoc.getSpellingLineNumber() << ":"
217  << FullLoc.getSpellingColumnNumber() << "\n";
218  }
219  }
220  // FIXME: Support multi-piece names.
221  // FIXME: better error handling (propagate error out).
222  SymbolName NewNameRef(NewName);
224  createRenameReplacements(Occurrences, SourceMgr, NewNameRef);
225  if (!Change) {
226  llvm::errs() << "Failed to create renaming replacements for '" << PrevName
227  << "'! " << llvm::toString(Change.takeError()) << "\n";
228  return;
229  }
230  convertChangesToFileReplacements(*Change, &FileToReplaces);
231  }
232 
233 private:
234  const std::vector<std::string> &NewNames, &PrevNames;
235  const std::vector<std::vector<std::string>> &USRList;
236  std::map<std::string, tooling::Replacements> &FileToReplaces;
237  bool PrintLocations;
238 };
239 
240 // A renamer to rename symbols which are identified by a give USRList to
241 // new name.
242 //
243 // FIXME: Merge with the above RenamingASTConsumer.
245 public:
246  USRSymbolRenamer(const std::vector<std::string> &NewNames,
247  const std::vector<std::vector<std::string>> &USRList,
248  std::map<std::string, tooling::Replacements> &FileToReplaces)
249  : NewNames(NewNames), USRList(USRList), FileToReplaces(FileToReplaces) {
250  assert(USRList.size() == NewNames.size());
251  }
252 
253  void HandleTranslationUnit(ASTContext &Context) override {
254  for (unsigned I = 0; I < NewNames.size(); ++I) {
255  // FIXME: Apply AtomicChanges directly once the refactoring APIs are
256  // ready.
258  USRList[I], NewNames[I], Context.getTranslationUnitDecl());
260  }
261  }
262 
263 private:
264  const std::vector<std::string> &NewNames;
265  const std::vector<std::vector<std::string>> &USRList;
266  std::map<std::string, tooling::Replacements> &FileToReplaces;
267 };
268 
269 std::unique_ptr<ASTConsumer> RenamingAction::newASTConsumer() {
270  return std::make_unique<RenamingASTConsumer>(NewNames, PrevNames, USRList,
271  FileToReplaces, PrintLocations);
272 }
273 
274 std::unique_ptr<ASTConsumer> QualifiedRenamingAction::newASTConsumer() {
275  return std::make_unique<USRSymbolRenamer>(NewNames, USRList, FileToReplaces);
276 }
277 
278 } // end namespace tooling
279 } // end namespace clang
std::vector< tooling::AtomicChange > createRenameAtomicChanges(llvm::ArrayRef< std::string > USRs, llvm::StringRef NewName, Decl *TranslationUnitDecl)
Create atomic changes for renaming all symbol references which are identified by the USRs set to a gi...
Defines the clang::ASTContext interface.
A name of a symbol.
Definition: SymbolName.h:29
ASTConsumer - This is an abstract interface that should be implemented by clients that read ASTs...
Definition: ASTConsumer.h:33
Defines the clang::FileManager interface and associated types.
Specialize PointerLikeTypeTraits to allow LazyGenerationalUpdatePtr to be placed into a PointerUnion...
Definition: Dominators.h:30
std::vector< std::string > getUSRsForDeclaration(const NamedDecl *ND, ASTContext &Context)
Returns the set of USRs that correspond to the given declaration.
std::vector< AtomicChange > AtomicChanges
Definition: AtomicChange.h:152
USRSymbolRenamer(const std::vector< std::string > &NewNames, const std::vector< std::vector< std::string >> &USRList, std::map< std::string, tooling::Replacements > &FileToReplaces)
llvm::Expected< std::vector< AtomicChange > > createRenameReplacements(const SymbolOccurrences &Occurrences, const SourceManager &SM, const SymbolName &NewName)
Returns source replacements that correspond to the rename of the given symbol occurrences.
Holds long-lived AST nodes (such as types and decls) that can be referred to throughout the semantic ...
Definition: ASTContext.h:174
llvm::Error createDiagnosticError(SourceLocation Loc, unsigned DiagID)
Creates an llvm::Error value that contains a diagnostic.
llvm::Error Error
Provides an action to find all relevant USRs at a point.
Methods for determining the USR of a symbol at a location in source code.
StringRef getFilename(SourceLocation SpellingLoc) const
Return the filename of the file containing a SourceLocation.
const NamedDecl * getNamedDeclFor(const ASTContext &Context, const std::string &Name)
Definition: USRFinder.cpp:128
A source range independent of the SourceManager.
Definition: Replacement.h:44
The refactoring rule context stores all of the inputs that might be needed by a refactoring action ru...
Provides functionality for finding all instances of a USR in a given AST.
Defines the clang::Preprocessor interface.
const NamedDecl * getCanonicalSymbolDeclaration(const NamedDecl *FoundDecl)
Returns the canonical declaration that best represents a symbol that can be renamed.
#define SM(sm)
Definition: Cuda.cpp:62
RenamingASTConsumer(const std::vector< std::string > &NewNames, const std::vector< std::string > &PrevNames, const std::vector< std::vector< std::string >> &USRList, std::map< std::string, tooling::Replacements > &FileToReplaces, bool PrintLocations)
const NamedDecl * getNamedDeclAt(const ASTContext &Context, const SourceLocation Point)
Definition: USRFinder.cpp:77
void HandleTranslationUnit(ASTContext &Context) override
HandleTranslationUnit - This method is called when the ASTs for entire translation unit have been par...
void HandleTranslationUnit(ASTContext &Context) override
HandleTranslationUnit - This method is called when the ASTs for entire translation unit have been par...
Dataflow Directional Tag Classes.
std::string toString(const til::SExpr *E)
const Replacements & getReplacements() const
Returns a const reference to existing replacements.
Definition: AtomicChange.h:117
void HandleOneRename(ASTContext &Context, const std::string &NewName, const std::string &PrevName, const std::vector< std::string > &USRs)
SourceManager & getSourceManager()
Definition: ASTContext.h:619
static void convertChangesToFileReplacements(ArrayRef< AtomicChange > AtomicChanges, std::map< std::string, tooling::Replacements > *FileToReplaces)
Takes each atomic change and inserts its replacements into the set of replacements that belong to the...
TranslationUnitDecl * getTranslationUnitDecl() const
Definition: ASTContext.h:935
std::vector< SymbolOccurrence > SymbolOccurrences
SymbolOccurrences getOccurrencesOfUSRs(ArrayRef< std::string > USRs, StringRef PrevName, Decl *Decl)
Finds the symbol occurrences for the symbol that&#39;s identified by the given USR set.
A SourceLocation and its associated SourceManager.
Defines the clang::FrontendAction interface and various convenience abstract classes (clang::ASTFront...
ArrayRef< std::string > getNamePieces() const
Definition: SymbolName.h:39
An atomic change is used to create and group a set of source edits, e.g.
Definition: AtomicChange.h:37
A trivial tuple used to represent a source range.
This represents a decl that may have a name.
Definition: Decl.h:223
Provides an action to rename every symbol at a point.
SourceLocation getBegin() const
This class handles loading and caching of source files into memory.