584 lines
22 KiB
C++
584 lines
22 KiB
C++
//===--- USRLocFinder.cpp - Clang refactoring library ---------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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///
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/// \file
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/// Methods for finding all instances of a USR. Our strategy is very
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/// simple; we just compare the USR at every relevant AST node with the one
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/// provided.
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///
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//===----------------------------------------------------------------------===//
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#include "clang/Tooling/Refactoring/Rename/USRLocFinder.h"
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#include "clang/AST/ASTContext.h"
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#include "clang/AST/ParentMapContext.h"
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#include "clang/AST/RecursiveASTVisitor.h"
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#include "clang/Basic/LLVM.h"
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#include "clang/Basic/SourceLocation.h"
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#include "clang/Basic/SourceManager.h"
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#include "clang/Lex/Lexer.h"
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#include "clang/Tooling/Core/Lookup.h"
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#include "clang/Tooling/Refactoring/RecursiveSymbolVisitor.h"
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#include "clang/Tooling/Refactoring/Rename/SymbolName.h"
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#include "clang/Tooling/Refactoring/Rename/USRFinder.h"
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#include "llvm/ADT/StringRef.h"
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#include "llvm/Support/Casting.h"
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#include <cstddef>
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#include <set>
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#include <string>
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#include <vector>
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using namespace llvm;
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namespace clang {
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namespace tooling {
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namespace {
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// Returns true if the given Loc is valid for edit. We don't edit the
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// SourceLocations that are valid or in temporary buffer.
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bool IsValidEditLoc(const clang::SourceManager& SM, clang::SourceLocation Loc) {
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if (Loc.isInvalid())
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return false;
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const clang::FullSourceLoc FullLoc(Loc, SM);
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std::pair<clang::FileID, unsigned> FileIdAndOffset =
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FullLoc.getSpellingLoc().getDecomposedLoc();
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return SM.getFileEntryForID(FileIdAndOffset.first) != nullptr;
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}
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// This visitor recursively searches for all instances of a USR in a
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// translation unit and stores them for later usage.
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class USRLocFindingASTVisitor
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: public RecursiveSymbolVisitor<USRLocFindingASTVisitor> {
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public:
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explicit USRLocFindingASTVisitor(const std::vector<std::string> &USRs,
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StringRef PrevName,
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const ASTContext &Context)
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: RecursiveSymbolVisitor(Context.getSourceManager(),
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Context.getLangOpts()),
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USRSet(USRs.begin(), USRs.end()), PrevName(PrevName), Context(Context) {
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}
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bool visitSymbolOccurrence(const NamedDecl *ND,
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ArrayRef<SourceRange> NameRanges) {
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if (USRSet.find(getUSRForDecl(ND)) != USRSet.end()) {
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assert(NameRanges.size() == 1 &&
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"Multiple name pieces are not supported yet!");
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SourceLocation Loc = NameRanges[0].getBegin();
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const SourceManager &SM = Context.getSourceManager();
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// TODO: Deal with macro occurrences correctly.
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if (Loc.isMacroID())
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Loc = SM.getSpellingLoc(Loc);
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checkAndAddLocation(Loc);
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}
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return true;
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}
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// Non-visitors:
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/// Returns a set of unique symbol occurrences. Duplicate or
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/// overlapping occurrences are erroneous and should be reported!
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SymbolOccurrences takeOccurrences() { return std::move(Occurrences); }
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private:
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void checkAndAddLocation(SourceLocation Loc) {
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const SourceLocation BeginLoc = Loc;
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const SourceLocation EndLoc = Lexer::getLocForEndOfToken(
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BeginLoc, 0, Context.getSourceManager(), Context.getLangOpts());
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StringRef TokenName =
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Lexer::getSourceText(CharSourceRange::getTokenRange(BeginLoc, EndLoc),
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Context.getSourceManager(), Context.getLangOpts());
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size_t Offset = TokenName.find(PrevName.getNamePieces()[0]);
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// The token of the source location we find actually has the old
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// name.
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if (Offset != StringRef::npos)
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Occurrences.emplace_back(PrevName, SymbolOccurrence::MatchingSymbol,
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BeginLoc.getLocWithOffset(Offset));
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}
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const std::set<std::string> USRSet;
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const SymbolName PrevName;
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SymbolOccurrences Occurrences;
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const ASTContext &Context;
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};
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SourceLocation StartLocationForType(TypeLoc TL) {
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// For elaborated types (e.g. `struct a::A`) we want the portion after the
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// `struct` but including the namespace qualifier, `a::`.
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if (auto ElaboratedTypeLoc = TL.getAs<clang::ElaboratedTypeLoc>()) {
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NestedNameSpecifierLoc NestedNameSpecifier =
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ElaboratedTypeLoc.getQualifierLoc();
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if (NestedNameSpecifier.getNestedNameSpecifier())
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return NestedNameSpecifier.getBeginLoc();
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TL = TL.getNextTypeLoc();
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}
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return TL.getBeginLoc();
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}
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SourceLocation EndLocationForType(TypeLoc TL) {
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// Dig past any namespace or keyword qualifications.
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while (TL.getTypeLocClass() == TypeLoc::Elaborated ||
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TL.getTypeLocClass() == TypeLoc::Qualified)
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TL = TL.getNextTypeLoc();
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// The location for template specializations (e.g. Foo<int>) includes the
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// templated types in its location range. We want to restrict this to just
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// before the `<` character.
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if (TL.getTypeLocClass() == TypeLoc::TemplateSpecialization) {
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return TL.castAs<TemplateSpecializationTypeLoc>()
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.getLAngleLoc()
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.getLocWithOffset(-1);
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}
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return TL.getEndLoc();
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}
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NestedNameSpecifier *GetNestedNameForType(TypeLoc TL) {
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// Dig past any keyword qualifications.
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while (TL.getTypeLocClass() == TypeLoc::Qualified)
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TL = TL.getNextTypeLoc();
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// For elaborated types (e.g. `struct a::A`) we want the portion after the
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// `struct` but including the namespace qualifier, `a::`.
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if (auto ElaboratedTypeLoc = TL.getAs<clang::ElaboratedTypeLoc>())
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return ElaboratedTypeLoc.getQualifierLoc().getNestedNameSpecifier();
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return nullptr;
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}
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// Find all locations identified by the given USRs for rename.
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//
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// This class will traverse the AST and find every AST node whose USR is in the
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// given USRs' set.
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class RenameLocFinder : public RecursiveASTVisitor<RenameLocFinder> {
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public:
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RenameLocFinder(llvm::ArrayRef<std::string> USRs, ASTContext &Context)
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: USRSet(USRs.begin(), USRs.end()), Context(Context) {}
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// A structure records all information of a symbol reference being renamed.
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// We try to add as few prefix qualifiers as possible.
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struct RenameInfo {
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// The begin location of a symbol being renamed.
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SourceLocation Begin;
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// The end location of a symbol being renamed.
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SourceLocation End;
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// The declaration of a symbol being renamed (can be nullptr).
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const NamedDecl *FromDecl;
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// The declaration in which the nested name is contained (can be nullptr).
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const Decl *Context;
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// The nested name being replaced (can be nullptr).
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const NestedNameSpecifier *Specifier;
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// Determine whether the prefix qualifiers of the NewName should be ignored.
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// Normally, we set it to true for the symbol declaration and definition to
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// avoid adding prefix qualifiers.
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// For example, if it is true and NewName is "a::b::foo", then the symbol
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// occurrence which the RenameInfo points to will be renamed to "foo".
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bool IgnorePrefixQualifers;
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};
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bool VisitNamedDecl(const NamedDecl *Decl) {
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// UsingDecl has been handled in other place.
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if (llvm::isa<UsingDecl>(Decl))
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return true;
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// DestructorDecl has been handled in Typeloc.
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if (llvm::isa<CXXDestructorDecl>(Decl))
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return true;
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if (Decl->isImplicit())
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return true;
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if (isInUSRSet(Decl)) {
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// For the case of renaming an alias template, we actually rename the
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// underlying alias declaration of the template.
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if (const auto* TAT = dyn_cast<TypeAliasTemplateDecl>(Decl))
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Decl = TAT->getTemplatedDecl();
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auto StartLoc = Decl->getLocation();
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auto EndLoc = StartLoc;
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if (IsValidEditLoc(Context.getSourceManager(), StartLoc)) {
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RenameInfo Info = {StartLoc,
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EndLoc,
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/*FromDecl=*/nullptr,
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/*Context=*/nullptr,
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/*Specifier=*/nullptr,
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/*IgnorePrefixQualifers=*/true};
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RenameInfos.push_back(Info);
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}
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}
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return true;
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}
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bool VisitMemberExpr(const MemberExpr *Expr) {
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const NamedDecl *Decl = Expr->getFoundDecl();
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auto StartLoc = Expr->getMemberLoc();
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auto EndLoc = Expr->getMemberLoc();
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if (isInUSRSet(Decl)) {
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RenameInfos.push_back({StartLoc, EndLoc,
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/*FromDecl=*/nullptr,
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/*Context=*/nullptr,
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/*Specifier=*/nullptr,
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/*IgnorePrefixQualifiers=*/true});
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}
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return true;
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}
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bool VisitCXXConstructorDecl(const CXXConstructorDecl *CD) {
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// Fix the constructor initializer when renaming class members.
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for (const auto *Initializer : CD->inits()) {
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// Ignore implicit initializers.
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if (!Initializer->isWritten())
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continue;
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if (const FieldDecl *FD = Initializer->getMember()) {
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if (isInUSRSet(FD)) {
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auto Loc = Initializer->getSourceLocation();
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RenameInfos.push_back({Loc, Loc,
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/*FromDecl=*/nullptr,
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/*Context=*/nullptr,
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/*Specifier=*/nullptr,
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/*IgnorePrefixQualifiers=*/true});
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}
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}
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}
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return true;
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}
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bool VisitDeclRefExpr(const DeclRefExpr *Expr) {
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const NamedDecl *Decl = Expr->getFoundDecl();
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// Get the underlying declaration of the shadow declaration introduced by a
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// using declaration.
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if (auto *UsingShadow = llvm::dyn_cast<UsingShadowDecl>(Decl)) {
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Decl = UsingShadow->getTargetDecl();
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}
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auto StartLoc = Expr->getBeginLoc();
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// For template function call expressions like `foo<int>()`, we want to
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// restrict the end of location to just before the `<` character.
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SourceLocation EndLoc = Expr->hasExplicitTemplateArgs()
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? Expr->getLAngleLoc().getLocWithOffset(-1)
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: Expr->getEndLoc();
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if (const auto *MD = llvm::dyn_cast<CXXMethodDecl>(Decl)) {
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if (isInUSRSet(MD)) {
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// Handle renaming static template class methods, we only rename the
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// name without prefix qualifiers and restrict the source range to the
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// name.
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RenameInfos.push_back({EndLoc, EndLoc,
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/*FromDecl=*/nullptr,
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/*Context=*/nullptr,
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/*Specifier=*/nullptr,
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/*IgnorePrefixQualifiers=*/true});
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return true;
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}
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}
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// In case of renaming an enum declaration, we have to explicitly handle
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// unscoped enum constants referenced in expressions (e.g.
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// "auto r = ns1::ns2::Green" where Green is an enum constant of an unscoped
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// enum decl "ns1::ns2::Color") as these enum constants cannot be caught by
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// TypeLoc.
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if (const auto *T = llvm::dyn_cast<EnumConstantDecl>(Decl)) {
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// FIXME: Handle the enum constant without prefix qualifiers (`a = Green`)
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// when renaming an unscoped enum declaration with a new namespace.
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if (!Expr->hasQualifier())
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return true;
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if (const auto *ED =
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llvm::dyn_cast_or_null<EnumDecl>(getClosestAncestorDecl(*T))) {
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if (ED->isScoped())
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return true;
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Decl = ED;
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}
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// The current fix would qualify "ns1::ns2::Green" as
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// "ns1::ns2::Color::Green".
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//
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// Get the EndLoc of the replacement by moving 1 character backward (
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// to exclude the last '::').
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//
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// ns1::ns2::Green;
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// ^ ^^
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// BeginLoc |EndLoc of the qualifier
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// new EndLoc
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EndLoc = Expr->getQualifierLoc().getEndLoc().getLocWithOffset(-1);
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assert(EndLoc.isValid() &&
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"The enum constant should have prefix qualifers.");
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}
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if (isInUSRSet(Decl) &&
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IsValidEditLoc(Context.getSourceManager(), StartLoc)) {
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RenameInfo Info = {StartLoc,
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EndLoc,
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Decl,
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getClosestAncestorDecl(*Expr),
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Expr->getQualifier(),
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/*IgnorePrefixQualifers=*/false};
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RenameInfos.push_back(Info);
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}
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return true;
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}
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bool VisitUsingDecl(const UsingDecl *Using) {
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for (const auto *UsingShadow : Using->shadows()) {
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if (isInUSRSet(UsingShadow->getTargetDecl())) {
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UsingDecls.push_back(Using);
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break;
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}
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}
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return true;
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}
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bool VisitNestedNameSpecifierLocations(NestedNameSpecifierLoc NestedLoc) {
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if (!NestedLoc.getNestedNameSpecifier()->getAsType())
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return true;
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if (const auto *TargetDecl =
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getSupportedDeclFromTypeLoc(NestedLoc.getTypeLoc())) {
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if (isInUSRSet(TargetDecl)) {
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RenameInfo Info = {NestedLoc.getBeginLoc(),
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EndLocationForType(NestedLoc.getTypeLoc()),
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TargetDecl,
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getClosestAncestorDecl(NestedLoc),
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NestedLoc.getNestedNameSpecifier()->getPrefix(),
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/*IgnorePrefixQualifers=*/false};
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RenameInfos.push_back(Info);
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}
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}
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return true;
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}
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bool VisitTypeLoc(TypeLoc Loc) {
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auto Parents = Context.getParents(Loc);
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TypeLoc ParentTypeLoc;
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if (!Parents.empty()) {
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// Handle cases of nested name specificier locations.
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//
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// The VisitNestedNameSpecifierLoc interface is not impelmented in
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// RecursiveASTVisitor, we have to handle it explicitly.
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if (const auto *NSL = Parents[0].get<NestedNameSpecifierLoc>()) {
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VisitNestedNameSpecifierLocations(*NSL);
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return true;
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}
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if (const auto *TL = Parents[0].get<TypeLoc>())
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ParentTypeLoc = *TL;
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}
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// Handle the outermost TypeLoc which is directly linked to the interesting
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// declaration and don't handle nested name specifier locations.
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if (const auto *TargetDecl = getSupportedDeclFromTypeLoc(Loc)) {
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if (isInUSRSet(TargetDecl)) {
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// Only handle the outermost typeLoc.
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//
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// For a type like "a::Foo", there will be two typeLocs for it.
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// One ElaboratedType, the other is RecordType:
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//
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// ElaboratedType 0x33b9390 'a::Foo' sugar
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// `-RecordType 0x338fef0 'class a::Foo'
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// `-CXXRecord 0x338fe58 'Foo'
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//
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// Skip if this is an inner typeLoc.
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if (!ParentTypeLoc.isNull() &&
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isInUSRSet(getSupportedDeclFromTypeLoc(ParentTypeLoc)))
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return true;
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auto StartLoc = StartLocationForType(Loc);
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auto EndLoc = EndLocationForType(Loc);
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if (IsValidEditLoc(Context.getSourceManager(), StartLoc)) {
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RenameInfo Info = {StartLoc,
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EndLoc,
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TargetDecl,
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getClosestAncestorDecl(Loc),
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GetNestedNameForType(Loc),
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/*IgnorePrefixQualifers=*/false};
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RenameInfos.push_back(Info);
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}
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return true;
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}
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}
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// Handle specific template class specialiation cases.
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if (const auto *TemplateSpecType =
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dyn_cast<TemplateSpecializationType>(Loc.getType())) {
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TypeLoc TargetLoc = Loc;
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if (!ParentTypeLoc.isNull()) {
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if (llvm::isa<ElaboratedType>(ParentTypeLoc.getType()))
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TargetLoc = ParentTypeLoc;
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}
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if (isInUSRSet(TemplateSpecType->getTemplateName().getAsTemplateDecl())) {
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TypeLoc TargetLoc = Loc;
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// FIXME: Find a better way to handle this case.
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// For the qualified template class specification type like
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// "ns::Foo<int>" in "ns::Foo<int>& f();", we want the parent typeLoc
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// (ElaboratedType) of the TemplateSpecializationType in order to
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// catch the prefix qualifiers "ns::".
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if (!ParentTypeLoc.isNull() &&
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llvm::isa<ElaboratedType>(ParentTypeLoc.getType()))
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TargetLoc = ParentTypeLoc;
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auto StartLoc = StartLocationForType(TargetLoc);
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auto EndLoc = EndLocationForType(TargetLoc);
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if (IsValidEditLoc(Context.getSourceManager(), StartLoc)) {
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RenameInfo Info = {
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StartLoc,
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EndLoc,
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TemplateSpecType->getTemplateName().getAsTemplateDecl(),
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getClosestAncestorDecl(DynTypedNode::create(TargetLoc)),
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GetNestedNameForType(TargetLoc),
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/*IgnorePrefixQualifers=*/false};
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RenameInfos.push_back(Info);
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}
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}
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}
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return true;
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}
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// Returns a list of RenameInfo.
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const std::vector<RenameInfo> &getRenameInfos() const { return RenameInfos; }
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// Returns a list of using declarations which are needed to update.
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const std::vector<const UsingDecl *> &getUsingDecls() const {
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return UsingDecls;
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}
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private:
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// Get the supported declaration from a given typeLoc. If the declaration type
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// is not supported, returns nullptr.
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const NamedDecl *getSupportedDeclFromTypeLoc(TypeLoc Loc) {
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if (const auto* TT = Loc.getType()->getAs<clang::TypedefType>())
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return TT->getDecl();
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if (const auto *RD = Loc.getType()->getAsCXXRecordDecl())
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return RD;
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if (const auto *ED =
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llvm::dyn_cast_or_null<EnumDecl>(Loc.getType()->getAsTagDecl()))
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return ED;
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return nullptr;
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}
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// Get the closest ancester which is a declaration of a given AST node.
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template <typename ASTNodeType>
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const Decl *getClosestAncestorDecl(const ASTNodeType &Node) {
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auto Parents = Context.getParents(Node);
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// FIXME: figure out how to handle it when there are multiple parents.
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if (Parents.size() != 1)
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return nullptr;
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if (ASTNodeKind::getFromNodeKind<Decl>().isBaseOf(Parents[0].getNodeKind()))
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return Parents[0].template get<Decl>();
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return getClosestAncestorDecl(Parents[0]);
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}
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// Get the parent typeLoc of a given typeLoc. If there is no such parent,
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// return nullptr.
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const TypeLoc *getParentTypeLoc(TypeLoc Loc) const {
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auto Parents = Context.getParents(Loc);
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// FIXME: figure out how to handle it when there are multiple parents.
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if (Parents.size() != 1)
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return nullptr;
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return Parents[0].get<TypeLoc>();
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}
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// Check whether the USR of a given Decl is in the USRSet.
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bool isInUSRSet(const Decl *Decl) const {
|
|
auto USR = getUSRForDecl(Decl);
|
|
if (USR.empty())
|
|
return false;
|
|
return llvm::is_contained(USRSet, USR);
|
|
}
|
|
|
|
const std::set<std::string> USRSet;
|
|
ASTContext &Context;
|
|
std::vector<RenameInfo> RenameInfos;
|
|
// Record all interested using declarations which contains the using-shadow
|
|
// declarations of the symbol declarations being renamed.
|
|
std::vector<const UsingDecl *> UsingDecls;
|
|
};
|
|
|
|
} // namespace
|
|
|
|
SymbolOccurrences getOccurrencesOfUSRs(ArrayRef<std::string> USRs,
|
|
StringRef PrevName, Decl *Decl) {
|
|
USRLocFindingASTVisitor Visitor(USRs, PrevName, Decl->getASTContext());
|
|
Visitor.TraverseDecl(Decl);
|
|
return Visitor.takeOccurrences();
|
|
}
|
|
|
|
std::vector<tooling::AtomicChange>
|
|
createRenameAtomicChanges(llvm::ArrayRef<std::string> USRs,
|
|
llvm::StringRef NewName, Decl *TranslationUnitDecl) {
|
|
RenameLocFinder Finder(USRs, TranslationUnitDecl->getASTContext());
|
|
Finder.TraverseDecl(TranslationUnitDecl);
|
|
|
|
const SourceManager &SM =
|
|
TranslationUnitDecl->getASTContext().getSourceManager();
|
|
|
|
std::vector<tooling::AtomicChange> AtomicChanges;
|
|
auto Replace = [&](SourceLocation Start, SourceLocation End,
|
|
llvm::StringRef Text) {
|
|
tooling::AtomicChange ReplaceChange = tooling::AtomicChange(SM, Start);
|
|
llvm::Error Err = ReplaceChange.replace(
|
|
SM, CharSourceRange::getTokenRange(Start, End), Text);
|
|
if (Err) {
|
|
llvm::errs() << "Failed to add replacement to AtomicChange: "
|
|
<< llvm::toString(std::move(Err)) << "\n";
|
|
return;
|
|
}
|
|
AtomicChanges.push_back(std::move(ReplaceChange));
|
|
};
|
|
|
|
for (const auto &RenameInfo : Finder.getRenameInfos()) {
|
|
std::string ReplacedName = NewName.str();
|
|
if (RenameInfo.IgnorePrefixQualifers) {
|
|
// Get the name without prefix qualifiers from NewName.
|
|
size_t LastColonPos = NewName.find_last_of(':');
|
|
if (LastColonPos != std::string::npos)
|
|
ReplacedName = std::string(NewName.substr(LastColonPos + 1));
|
|
} else {
|
|
if (RenameInfo.FromDecl && RenameInfo.Context) {
|
|
if (!llvm::isa<clang::TranslationUnitDecl>(
|
|
RenameInfo.Context->getDeclContext())) {
|
|
ReplacedName = tooling::replaceNestedName(
|
|
RenameInfo.Specifier, RenameInfo.Begin,
|
|
RenameInfo.Context->getDeclContext(), RenameInfo.FromDecl,
|
|
NewName.startswith("::") ? NewName.str()
|
|
: ("::" + NewName).str());
|
|
} else {
|
|
// This fixes the case where type `T` is a parameter inside a function
|
|
// type (e.g. `std::function<void(T)>`) and the DeclContext of `T`
|
|
// becomes the translation unit. As a workaround, we simply use
|
|
// fully-qualified name here for all references whose `DeclContext` is
|
|
// the translation unit and ignore the possible existence of
|
|
// using-decls (in the global scope) that can shorten the replaced
|
|
// name.
|
|
llvm::StringRef ActualName = Lexer::getSourceText(
|
|
CharSourceRange::getTokenRange(
|
|
SourceRange(RenameInfo.Begin, RenameInfo.End)),
|
|
SM, TranslationUnitDecl->getASTContext().getLangOpts());
|
|
// Add the leading "::" back if the name written in the code contains
|
|
// it.
|
|
if (ActualName.startswith("::") && !NewName.startswith("::")) {
|
|
ReplacedName = "::" + NewName.str();
|
|
}
|
|
}
|
|
}
|
|
// If the NewName contains leading "::", add it back.
|
|
if (NewName.startswith("::") && NewName.substr(2) == ReplacedName)
|
|
ReplacedName = NewName.str();
|
|
}
|
|
Replace(RenameInfo.Begin, RenameInfo.End, ReplacedName);
|
|
}
|
|
|
|
// Hanlde using declarations explicitly as "using a::Foo" don't trigger
|
|
// typeLoc for "a::Foo".
|
|
for (const auto *Using : Finder.getUsingDecls())
|
|
Replace(Using->getBeginLoc(), Using->getEndLoc(), "using " + NewName.str());
|
|
|
|
return AtomicChanges;
|
|
}
|
|
|
|
} // end namespace tooling
|
|
} // end namespace clang
|