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//===--- tools/extra/clang-rename/USRLocFinder.cpp - Clang rename tool ----===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
///
/// \file
/// \brief Mehtods for finding all instances of a USR. Our strategy is very
/// simple; we just compare the USR at every relevant AST node with the one
/// provided.
///
//===----------------------------------------------------------------------===//
#include "USRLocFinder.h"
#include "USRFinder.h"
#include "clang/AST/ASTContext.h"
#include "clang/AST/RecursiveASTVisitor.h"
#include "clang/Basic/SourceLocation.h"
#include "clang/Index/USRGeneration.h"
#include "clang/Lex/Lexer.h"
#include "llvm/ADT/SmallVector.h"
using namespace llvm;
namespace clang {
namespace rename {
namespace {
// \brief This visitor recursively searches for all instances of a USR in a
// translation unit and stores them for later usage.
class USRLocFindingASTVisitor
: public clang::RecursiveASTVisitor<USRLocFindingASTVisitor> {
public:
explicit USRLocFindingASTVisitor(const std::vector<std::string> &USRs,
StringRef PrevName,
const ASTContext &Context)
: USRSet(USRs.begin(), USRs.end()), PrevName(PrevName), Context(Context) {
}
// Declaration visitors:
bool VisitCXXConstructorDecl(clang::CXXConstructorDecl *ConstructorDecl) {
for (auto &Initializer : ConstructorDecl->inits()) {
if (Initializer->getSourceOrder() == -1) {
// Ignore implicit initializers.
continue;
}
if (const clang::FieldDecl *FieldDecl = Initializer->getAnyMember()) {
if (USRSet.find(getUSRForDecl(FieldDecl)) != USRSet.end()) {
// The initializer refers to a field that is to be renamed.
SourceLocation Location = Initializer->getSourceLocation();
StringRef TokenName = Lexer::getSourceText(
CharSourceRange::getTokenRange(Location),
Context.getSourceManager(), Context.getLangOpts());
if (TokenName == PrevName) {
// The token of the source location we find actually has the old
// name.
LocationsFound.push_back(Initializer->getSourceLocation());
}
}
}
}
return true;
}
bool VisitNamedDecl(const NamedDecl *Decl) {
if (USRSet.find(getUSRForDecl(Decl)) != USRSet.end()) {
checkAndAddLocation(Decl->getLocation());
}
return true;
}
// Expression visitors:
bool VisitDeclRefExpr(const DeclRefExpr *Expr) {
const auto *Decl = Expr->getFoundDecl();
if (USRSet.find(getUSRForDecl(Decl)) != USRSet.end()) {
const SourceManager &Manager = Decl->getASTContext().getSourceManager();
SourceLocation Location = Manager.getSpellingLoc(Expr->getLocation());
checkAndAddLocation(Location);
}
return true;
}
bool VisitMemberExpr(const MemberExpr *Expr) {
const auto *Decl = Expr->getFoundDecl().getDecl();
if (USRSet.find(getUSRForDecl(Decl)) != USRSet.end()) {
const SourceManager &Manager = Decl->getASTContext().getSourceManager();
SourceLocation Location = Manager.getSpellingLoc(Expr->getMemberLoc());
checkAndAddLocation(Location);
}
return true;
}
// Other visitors:
bool VisitTypeLoc(const TypeLoc Loc) {
if (USRSet.find(getUSRForDecl(Loc.getType()->getAsCXXRecordDecl())) !=
USRSet.end()) {
checkAndAddLocation(Loc.getBeginLoc());
}
return true;
}
// Non-visitors:
// \brief Returns a list of unique locations. Duplicate or overlapping
// locations are erroneous and should be reported!
const std::vector<clang::SourceLocation> &getLocationsFound() const {
return LocationsFound;
}
// Namespace traversal:
void handleNestedNameSpecifierLoc(NestedNameSpecifierLoc NameLoc) {
while (NameLoc) {
const auto *Decl = NameLoc.getNestedNameSpecifier()->getAsNamespace();
if (Decl && USRSet.find(getUSRForDecl(Decl)) != USRSet.end()) {
checkAndAddLocation(NameLoc.getLocalBeginLoc());
}
NameLoc = NameLoc.getPrefix();
}
}
private:
void checkAndAddLocation(SourceLocation Loc) {
const auto BeginLoc = Loc;
const auto EndLoc = Lexer::getLocForEndOfToken(
BeginLoc, 0, Context.getSourceManager(), Context.getLangOpts());
StringRef TokenName =
Lexer::getSourceText(CharSourceRange::getTokenRange(BeginLoc, EndLoc),
Context.getSourceManager(), Context.getLangOpts());
size_t Offset = TokenName.find(PrevName);
if (Offset != StringRef::npos) {
// The token of the source location we find actually has the old
// name.
LocationsFound.push_back(BeginLoc.getLocWithOffset(Offset));
}
}
const std::set<std::string> USRSet;
const std::string PrevName;
std::vector<clang::SourceLocation> LocationsFound;
const ASTContext &Context;
};
} // namespace
std::vector<SourceLocation>
getLocationsOfUSRs(const std::vector<std::string> &USRs, StringRef PrevName,
Decl *Decl) {
USRLocFindingASTVisitor Visitor(USRs, PrevName, Decl->getASTContext());
Visitor.TraverseDecl(Decl);
NestedNameSpecifierLocFinder Finder(Decl->getASTContext());
for (const auto &Location : Finder.getNestedNameSpecifierLocations()) {
Visitor.handleNestedNameSpecifierLoc(Location);
}
return Visitor.getLocationsFound();
}
} // namespace rename
} // namespace clang
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