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//===-- ChangeNamespace.h -- Change namespace ------------------*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_CLANG_TOOLS_EXTRA_CHANGE_NAMESPACE_CHANGENAMESPACE_H
#define LLVM_CLANG_TOOLS_EXTRA_CHANGE_NAMESPACE_CHANGENAMESPACE_H
#include "clang/ASTMatchers/ASTMatchFinder.h"
#include "clang/Format/Format.h"
#include "clang/Tooling/Core/Replacement.h"
#include "llvm/Support/Regex.h"
#include <string>
namespace clang {
namespace change_namespace {
// This tool can be used to change the surrounding namespaces of class/function
// definitions. Classes/functions in the moved namespace will have new
// namespaces while references to symbols (e.g. types, functions) which are not
// defined in the changed namespace will be correctly qualified by prepending
// namespace specifiers before them.
// This will try to add shortest namespace specifiers possible. When a symbol
// reference needs to be fully-qualified, this adds a "::" prefix to the
// namespace specifiers unless the new namespace is the global namespace.
// For classes, only classes that are declared/defined in the given namespace in
// specified files will be moved: forward declarations will remain in the old
// namespace.
// For example, changing "a" to "x":
// Old code:
// namespace a {
// class FWD;
// class A { FWD *fwd; }
// } // a
// New code:
// namespace a {
// class FWD;
// } // a
// namespace x {
// class A { ::a::FWD *fwd; }
// } // x
// FIXME: support moving typedef, enums across namespaces.
class ChangeNamespaceTool : public ast_matchers::MatchFinder::MatchCallback {
public:
// Moves code in the old namespace `OldNs` to the new namespace `NewNs` in
// files matching `FilePattern`.
ChangeNamespaceTool(
llvm::StringRef OldNs, llvm::StringRef NewNs, llvm::StringRef FilePattern,
llvm::ArrayRef<std::string> AllowedSymbolPatterns,
std::map<std::string, tooling::Replacements> *FileToReplacements,
llvm::StringRef FallbackStyle = "LLVM");
void registerMatchers(ast_matchers::MatchFinder *Finder);
void run(const ast_matchers::MatchFinder::MatchResult &Result) override;
// Moves the changed code in old namespaces but leaves class forward
// declarations behind.
void onEndOfTranslationUnit() override;
private:
void moveOldNamespace(const ast_matchers::MatchFinder::MatchResult &Result,
const NamespaceDecl *NsDecl);
void moveClassForwardDeclaration(
const ast_matchers::MatchFinder::MatchResult &Result,
const NamedDecl *FwdDecl);
void replaceQualifiedSymbolInDeclContext(
const ast_matchers::MatchFinder::MatchResult &Result,
const DeclContext *DeclContext, SourceLocation Start, SourceLocation End,
const NamedDecl *FromDecl);
void fixTypeLoc(const ast_matchers::MatchFinder::MatchResult &Result,
SourceLocation Start, SourceLocation End, TypeLoc Type);
void fixUsingShadowDecl(const ast_matchers::MatchFinder::MatchResult &Result,
const UsingDecl *UsingDeclaration);
void fixDeclRefExpr(const ast_matchers::MatchFinder::MatchResult &Result,
const DeclContext *UseContext, const NamedDecl *From,
const DeclRefExpr *Ref);
// Information about moving an old namespace.
struct MoveNamespace {
// The start offset of the namespace block being moved in the original
// code.
unsigned Offset;
// The length of the namespace block in the original code.
unsigned Length;
// The offset at which the new namespace block will be inserted in the
// original code.
unsigned InsertionOffset;
// The file in which the namespace is declared.
FileID FID;
SourceManager *SourceMgr;
};
// Information about inserting a class forward declaration.
struct InsertForwardDeclaration {
// The offset at while the forward declaration will be inserted in the
// original code.
unsigned InsertionOffset;
// The code to be inserted.
std::string ForwardDeclText;
};
std::string FallbackStyle;
// In match callbacks, this contains replacements for replacing `typeLoc`s in
// and deleting forward declarations in the moved namespace blocks.
// In `onEndOfTranslationUnit` callback, the previous added replacements are
// applied (on the moved namespace blocks), and then changed code in old
// namespaces re moved to new namespaces, and previously deleted forward
// declarations are inserted back to old namespaces, from which they are
// deleted.
std::map<std::string, tooling::Replacements> &FileToReplacements;
// A fully qualified name of the old namespace without "::" prefix, e.g.
// "a::b::c".
std::string OldNamespace;
// A fully qualified name of the new namespace without "::" prefix, e.g.
// "x::y::z".
std::string NewNamespace;
// The longest suffix in the old namespace that does not overlap the new
// namespace.
// For example, if `OldNamespace` is "a::b::c" and `NewNamespace` is
// "a::x::y", then `DiffOldNamespace` will be "b::c".
std::string DiffOldNamespace;
// The longest suffix in the new namespace that does not overlap the old
// namespace.
// For example, if `OldNamespace` is "a::b::c" and `NewNamespace` is
// "a::x::y", then `DiffNewNamespace` will be "x::y".
std::string DiffNewNamespace;
// A regex pattern that matches files to be processed.
std::string FilePattern;
llvm::Regex FilePatternRE;
// Information about moved namespaces grouped by file.
// Since we are modifying code in old namespaces (e.g. add namespace
// specifiers) as well as moving them, we store information about namespaces
// to be moved and only move them after all modifications are finished (i.e.
// in `onEndOfTranslationUnit`).
std::map<std::string, std::vector<MoveNamespace>> MoveNamespaces;
// Information about forward declaration insertions grouped by files.
// A class forward declaration is not moved, so it will be deleted from the
// moved code block and inserted back into the old namespace. The insertion
// will be done after removing the code from the old namespace and before
// inserting it to the new namespace.
std::map<std::string, std::vector<InsertForwardDeclaration>> InsertFwdDecls;
// Records all using declarations, which can be used to shorten namespace
// specifiers.
llvm::SmallPtrSet<const UsingDecl *, 8> UsingDecls;
// Records all using namespace declarations, which can be used to shorten
// namespace specifiers.
llvm::SmallPtrSet<const UsingDirectiveDecl *, 8> UsingNamespaceDecls;
// Records all namespace alias declarations, which can be used to shorten
// namespace specifiers.
llvm::SmallPtrSet<const NamespaceAliasDecl *, 8> NamespaceAliasDecls;
// TypeLocs of CXXCtorInitializer. Types of CXXCtorInitializers do not need to
// be fixed.
llvm::SmallVector<TypeLoc, 8> BaseCtorInitializerTypeLocs;
// Since a DeclRefExpr for a function call can be matched twice (one as
// CallExpr and one as DeclRefExpr), we record all DeclRefExpr's that have
// been processed so that we don't handle them twice.
llvm::SmallPtrSet<const clang::DeclRefExpr*, 16> ProcessedFuncRefs;
// Patterns of symbol names whose references are not expected to be updated
// when changing namespaces around them.
std::vector<llvm::Regex> AllowedSymbolRegexes;
};
} // namespace change_namespace
} // namespace clang
#endif // LLVM_CLANG_TOOLS_EXTRA_CHANGE_NAMESPACE_CHANGENAMESPACE_H
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