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llvm-project/clang-tools-extra/clang-move/Move.cpp

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//===-- Move.cpp - Implement ClangMove functationalities --------*- 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
//
//===----------------------------------------------------------------------===//
#include "Move.h"
#include "HelperDeclRefGraph.h"
#include "clang/ASTMatchers/ASTMatchers.h"
#include "clang/Basic/SourceManager.h"
#include "clang/Format/Format.h"
#include "clang/Frontend/CompilerInstance.h"
#include "clang/Lex/Lexer.h"
#include "clang/Lex/Preprocessor.h"
#include "clang/Rewrite/Core/Rewriter.h"
#include "clang/Tooling/Core/Replacement.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/Path.h"
#define DEBUG_TYPE "clang-move"
using namespace clang::ast_matchers;
namespace clang {
namespace move {
namespace {
// FIXME: Move to ASTMatchers.
AST_MATCHER(VarDecl, isStaticDataMember) { return Node.isStaticDataMember(); }
AST_MATCHER(NamedDecl, notInMacro) { return !Node.getLocation().isMacroID(); }
AST_MATCHER_P(Decl, hasOutermostEnclosingClass,
ast_matchers::internal::Matcher<Decl>, InnerMatcher) {
const auto *Context = Node.getDeclContext();
if (!Context)
return false;
while (const auto *NextContext = Context->getParent()) {
if (isa<NamespaceDecl>(NextContext) ||
isa<TranslationUnitDecl>(NextContext))
break;
Context = NextContext;
}
return InnerMatcher.matches(*Decl::castFromDeclContext(Context), Finder,
Builder);
}
AST_MATCHER_P(CXXMethodDecl, ofOutermostEnclosingClass,
ast_matchers::internal::Matcher<CXXRecordDecl>, InnerMatcher) {
const CXXRecordDecl *Parent = Node.getParent();
if (!Parent)
return false;
while (const auto *NextParent =
dyn_cast<CXXRecordDecl>(Parent->getParent())) {
Parent = NextParent;
}
return InnerMatcher.matches(*Parent, Finder, Builder);
}
std::string CleanPath(StringRef PathRef) {
llvm::SmallString<128> Path(PathRef);
llvm::sys::path::remove_dots(Path, /*remove_dot_dot=*/true);
// FIXME: figure out why this is necessary.
llvm::sys::path::native(Path);
return Path.str();
}
// Make the Path absolute using the CurrentDir if the Path is not an absolute
// path. An empty Path will result in an empty string.
std::string MakeAbsolutePath(StringRef CurrentDir, StringRef Path) {
if (Path.empty())
return "";
llvm::SmallString<128> InitialDirectory(CurrentDir);
llvm::SmallString<128> AbsolutePath(Path);
llvm::sys::fs::make_absolute(InitialDirectory, AbsolutePath);
return CleanPath(std::move(AbsolutePath));
}
// Make the Path absolute using the current working directory of the given
// SourceManager if the Path is not an absolute path.
//
// The Path can be a path relative to the build directory, or retrieved from
// the SourceManager.
std::string MakeAbsolutePath(const SourceManager &SM, StringRef Path) {
llvm::SmallString<128> AbsolutePath(Path);
if (std::error_code EC =
SM.getFileManager().getVirtualFileSystem().makeAbsolute(AbsolutePath))
llvm::errs() << "Warning: could not make absolute file: '" << EC.message()
<< '\n';
// Handle symbolic link path cases.
// We are trying to get the real file path of the symlink.
const DirectoryEntry *Dir = SM.getFileManager().getDirectory(
llvm::sys::path::parent_path(AbsolutePath.str()));
if (Dir) {
StringRef DirName = SM.getFileManager().getCanonicalName(Dir);
// FIXME: getCanonicalName might fail to get real path on VFS.
if (llvm::sys::path::is_absolute(DirName)) {
SmallString<128> AbsoluteFilename;
llvm::sys::path::append(AbsoluteFilename, DirName,
llvm::sys::path::filename(AbsolutePath.str()));
return CleanPath(AbsoluteFilename);
}
}
return CleanPath(AbsolutePath);
}
// Matches AST nodes that are expanded within the given AbsoluteFilePath.
AST_POLYMORPHIC_MATCHER_P(isExpansionInFile,
AST_POLYMORPHIC_SUPPORTED_TYPES(Decl, Stmt, TypeLoc),
std::string, AbsoluteFilePath) {
auto &SourceManager = Finder->getASTContext().getSourceManager();
auto ExpansionLoc = SourceManager.getExpansionLoc(Node.getBeginLoc());
if (ExpansionLoc.isInvalid())
return false;
auto FileEntry =
SourceManager.getFileEntryForID(SourceManager.getFileID(ExpansionLoc));
if (!FileEntry)
return false;
return MakeAbsolutePath(SourceManager, FileEntry->getName()) ==
AbsoluteFilePath;
}
class FindAllIncludes : public PPCallbacks {
public:
explicit FindAllIncludes(SourceManager *SM, ClangMoveTool *const MoveTool)
: SM(*SM), MoveTool(MoveTool) {}
void InclusionDirective(SourceLocation HashLoc, const Token & /*IncludeTok*/,
StringRef FileName, bool IsAngled,
CharSourceRange FilenameRange,
const FileEntry * /*File*/, StringRef SearchPath,
StringRef /*RelativePath*/,
const Module * /*Imported*/,
SrcMgr::CharacteristicKind /*FileType*/) override {
if (const auto *FileEntry = SM.getFileEntryForID(SM.getFileID(HashLoc)))
MoveTool->addIncludes(FileName, IsAngled, SearchPath,
FileEntry->getName(), FilenameRange, SM);
}
private:
const SourceManager &SM;
ClangMoveTool *const MoveTool;
};
/// Add a declatration being moved to new.h/cc. Note that the declaration will
/// also be deleted in old.h/cc.
void MoveDeclFromOldFileToNewFile(ClangMoveTool *MoveTool, const NamedDecl *D) {
MoveTool->getMovedDecls().push_back(D);
MoveTool->addRemovedDecl(D);
MoveTool->getUnremovedDeclsInOldHeader().erase(D);
}
class FunctionDeclarationMatch : public MatchFinder::MatchCallback {
public:
explicit FunctionDeclarationMatch(ClangMoveTool *MoveTool)
: MoveTool(MoveTool) {}
void run(const MatchFinder::MatchResult &Result) override {
const auto *FD = Result.Nodes.getNodeAs<FunctionDecl>("function");
assert(FD);
const NamedDecl *D = FD;
if (const auto *FTD = FD->getDescribedFunctionTemplate())
D = FTD;
MoveDeclFromOldFileToNewFile(MoveTool, D);
}
private:
ClangMoveTool *MoveTool;
};
class VarDeclarationMatch : public MatchFinder::MatchCallback {
public:
explicit VarDeclarationMatch(ClangMoveTool *MoveTool)
: MoveTool(MoveTool) {}
void run(const MatchFinder::MatchResult &Result) override {
const auto *VD = Result.Nodes.getNodeAs<VarDecl>("var");
assert(VD);
MoveDeclFromOldFileToNewFile(MoveTool, VD);
}
private:
ClangMoveTool *MoveTool;
};
class TypeAliasMatch : public MatchFinder::MatchCallback {
public:
explicit TypeAliasMatch(ClangMoveTool *MoveTool)
: MoveTool(MoveTool) {}
void run(const MatchFinder::MatchResult &Result) override {
if (const auto *TD = Result.Nodes.getNodeAs<TypedefDecl>("typedef"))
MoveDeclFromOldFileToNewFile(MoveTool, TD);
else if (const auto *TAD =
Result.Nodes.getNodeAs<TypeAliasDecl>("type_alias")) {
const NamedDecl * D = TAD;
if (const auto * TD = TAD->getDescribedAliasTemplate())
D = TD;
MoveDeclFromOldFileToNewFile(MoveTool, D);
}
}
private:
ClangMoveTool *MoveTool;
};
class EnumDeclarationMatch : public MatchFinder::MatchCallback {
public:
explicit EnumDeclarationMatch(ClangMoveTool *MoveTool)
: MoveTool(MoveTool) {}
void run(const MatchFinder::MatchResult &Result) override {
const auto *ED = Result.Nodes.getNodeAs<EnumDecl>("enum");
assert(ED);
MoveDeclFromOldFileToNewFile(MoveTool, ED);
}
private:
ClangMoveTool *MoveTool;
};
class ClassDeclarationMatch : public MatchFinder::MatchCallback {
public:
explicit ClassDeclarationMatch(ClangMoveTool *MoveTool)
: MoveTool(MoveTool) {}
void run(const MatchFinder::MatchResult &Result) override {
SourceManager *SM = &Result.Context->getSourceManager();
if (const auto *CMD = Result.Nodes.getNodeAs<CXXMethodDecl>("class_method"))
MatchClassMethod(CMD, SM);
else if (const auto *VD =
Result.Nodes.getNodeAs<VarDecl>("class_static_var_decl"))
MatchClassStaticVariable(VD, SM);
else if (const auto *CD =
Result.Nodes.getNodeAs<CXXRecordDecl>("moved_class"))
MatchClassDeclaration(CD, SM);
}
private:
void MatchClassMethod(const CXXMethodDecl *CMD, SourceManager *SM) {
// Skip inline class methods. isInline() ast matcher doesn't ignore this
// case.
if (!CMD->isInlined()) {
MoveTool->getMovedDecls().push_back(CMD);
MoveTool->addRemovedDecl(CMD);
// Get template class method from its method declaration as
// UnremovedDecls stores template class method.
if (const auto *FTD = CMD->getDescribedFunctionTemplate())
MoveTool->getUnremovedDeclsInOldHeader().erase(FTD);
else
MoveTool->getUnremovedDeclsInOldHeader().erase(CMD);
}
}
void MatchClassStaticVariable(const NamedDecl *VD, SourceManager *SM) {
MoveDeclFromOldFileToNewFile(MoveTool, VD);
}
void MatchClassDeclaration(const CXXRecordDecl *CD, SourceManager *SM) {
// Get class template from its class declaration as UnremovedDecls stores
// class template.
if (const auto *TC = CD->getDescribedClassTemplate())
MoveTool->getMovedDecls().push_back(TC);
else
MoveTool->getMovedDecls().push_back(CD);
MoveTool->addRemovedDecl(MoveTool->getMovedDecls().back());
MoveTool->getUnremovedDeclsInOldHeader().erase(
MoveTool->getMovedDecls().back());
}
ClangMoveTool *MoveTool;
};
// Expand to get the end location of the line where the EndLoc of the given
// Decl.
SourceLocation getLocForEndOfDecl(const Decl *D,
const LangOptions &LangOpts = LangOptions()) {
const auto &SM = D->getASTContext().getSourceManager();
// If the expansion range is a character range, this is the location of
// the first character past the end. Otherwise it's the location of the
// first character in the final token in the range.
auto EndExpansionLoc = SM.getExpansionRange(D->getEndLoc()).getEnd();
std::pair<FileID, unsigned> LocInfo = SM.getDecomposedLoc(EndExpansionLoc);
// Try to load the file buffer.
bool InvalidTemp = false;
llvm::StringRef File = SM.getBufferData(LocInfo.first, &InvalidTemp);
if (InvalidTemp)
return SourceLocation();
const char *TokBegin = File.data() + LocInfo.second;
// Lex from the start of the given location.
Lexer Lex(SM.getLocForStartOfFile(LocInfo.first), LangOpts, File.begin(),
TokBegin, File.end());
llvm::SmallVector<char, 16> Line;
// FIXME: this is a bit hacky to get ReadToEndOfLine work.
Lex.setParsingPreprocessorDirective(true);
Lex.ReadToEndOfLine(&Line);
SourceLocation EndLoc = EndExpansionLoc.getLocWithOffset(Line.size());
// If we already reach EOF, just return the EOF SourceLocation;
// otherwise, move 1 offset ahead to include the trailing newline character
// '\n'.
return SM.getLocForEndOfFile(LocInfo.first) == EndLoc
? EndLoc
: EndLoc.getLocWithOffset(1);
}
// Get full range of a Decl including the comments associated with it.
CharSourceRange getFullRange(const Decl *D,
const LangOptions &options = LangOptions()) {
const auto &SM = D->getASTContext().getSourceManager();
SourceRange Full(SM.getExpansionLoc(D->getBeginLoc()), getLocForEndOfDecl(D));
// Expand to comments that are associated with the Decl.
if (const auto *Comment = D->getASTContext().getRawCommentForDeclNoCache(D)) {
if (SM.isBeforeInTranslationUnit(Full.getEnd(), Comment->getEndLoc()))
Full.setEnd(Comment->getEndLoc());
// FIXME: Don't delete a preceding comment, if there are no other entities
// it could refer to.
if (SM.isBeforeInTranslationUnit(Comment->getBeginLoc(), Full.getBegin()))
Full.setBegin(Comment->getBeginLoc());
}
return CharSourceRange::getCharRange(Full);
}
std::string getDeclarationSourceText(const Decl *D) {
const auto &SM = D->getASTContext().getSourceManager();
llvm::StringRef SourceText =
Lexer::getSourceText(getFullRange(D), SM, LangOptions());
return SourceText.str();
}
bool isInHeaderFile(const Decl *D, llvm::StringRef OriginalRunningDirectory,
llvm::StringRef OldHeader) {
const auto &SM = D->getASTContext().getSourceManager();
if (OldHeader.empty())
return false;
auto ExpansionLoc = SM.getExpansionLoc(D->getBeginLoc());
if (ExpansionLoc.isInvalid())
return false;
if (const auto *FE = SM.getFileEntryForID(SM.getFileID(ExpansionLoc))) {
return MakeAbsolutePath(SM, FE->getName()) ==
MakeAbsolutePath(OriginalRunningDirectory, OldHeader);
}
return false;
}
std::vector<std::string> getNamespaces(const Decl *D) {
std::vector<std::string> Namespaces;
for (const auto *Context = D->getDeclContext(); Context;
Context = Context->getParent()) {
if (llvm::isa<TranslationUnitDecl>(Context) ||
llvm::isa<LinkageSpecDecl>(Context))
break;
if (const auto *ND = llvm::dyn_cast<NamespaceDecl>(Context))
Namespaces.push_back(ND->getName().str());
}
std::reverse(Namespaces.begin(), Namespaces.end());
return Namespaces;
}
tooling::Replacements
createInsertedReplacements(const std::vector<std::string> &Includes,
const std::vector<const NamedDecl *> &Decls,
llvm::StringRef FileName, bool IsHeader = false,
StringRef OldHeaderInclude = "") {
std::string NewCode;
std::string GuardName(FileName);
if (IsHeader) {
for (size_t i = 0; i < GuardName.size(); ++i) {
if (!isAlphanumeric(GuardName[i]))
GuardName[i] = '_';
}
GuardName = StringRef(GuardName).upper();
NewCode += "#ifndef " + GuardName + "\n";
NewCode += "#define " + GuardName + "\n\n";
}
NewCode += OldHeaderInclude;
// Add #Includes.
for (const auto &Include : Includes)
NewCode += Include;
if (!Includes.empty())
NewCode += "\n";
// Add moved class definition and its related declarations. All declarations
// in same namespace are grouped together.
//
// Record namespaces where the current position is in.
std::vector<std::string> CurrentNamespaces;
for (const auto *MovedDecl : Decls) {
// The namespaces of the declaration being moved.
std::vector<std::string> DeclNamespaces = getNamespaces(MovedDecl);
auto CurrentIt = CurrentNamespaces.begin();
auto DeclIt = DeclNamespaces.begin();
// Skip the common prefix.
while (CurrentIt != CurrentNamespaces.end() &&
DeclIt != DeclNamespaces.end()) {
if (*CurrentIt != *DeclIt)
break;
++CurrentIt;
++DeclIt;
}
// Calculate the new namespaces after adding MovedDecl in CurrentNamespace,
// which is used for next iteration of this loop.
std::vector<std::string> NextNamespaces(CurrentNamespaces.begin(),
CurrentIt);
NextNamespaces.insert(NextNamespaces.end(), DeclIt, DeclNamespaces.end());
// End with CurrentNamespace.
bool HasEndCurrentNamespace = false;
auto RemainingSize = CurrentNamespaces.end() - CurrentIt;
for (auto It = CurrentNamespaces.rbegin(); RemainingSize > 0;
--RemainingSize, ++It) {
assert(It < CurrentNamespaces.rend());
NewCode += "} // namespace " + *It + "\n";
HasEndCurrentNamespace = true;
}
// Add trailing '\n' after the nested namespace definition.
if (HasEndCurrentNamespace)
NewCode += "\n";
// If the moved declaration is not in CurrentNamespace, add extra namespace
// definitions.
bool IsInNewNamespace = false;
while (DeclIt != DeclNamespaces.end()) {
NewCode += "namespace " + *DeclIt + " {\n";
IsInNewNamespace = true;
++DeclIt;
}
// If the moved declaration is in same namespace CurrentNamespace, add
// a preceeding `\n' before the moved declaration.
// FIXME: Don't add empty lines between using declarations.
if (!IsInNewNamespace)
NewCode += "\n";
NewCode += getDeclarationSourceText(MovedDecl);
CurrentNamespaces = std::move(NextNamespaces);
}
std::reverse(CurrentNamespaces.begin(), CurrentNamespaces.end());
for (const auto &NS : CurrentNamespaces)
NewCode += "} // namespace " + NS + "\n";
if (IsHeader)
NewCode += "\n#endif // " + GuardName + "\n";
return tooling::Replacements(tooling::Replacement(FileName, 0, 0, NewCode));
}
// Return a set of all decls which are used/referenced by the given Decls.
// Specically, given a class member declaration, this method will return all
// decls which are used by the whole class.
llvm::DenseSet<const Decl *>
getUsedDecls(const HelperDeclRefGraph *RG,
const std::vector<const NamedDecl *> &Decls) {
assert(RG);
llvm::DenseSet<const CallGraphNode *> Nodes;
for (const auto *D : Decls) {
auto Result = RG->getReachableNodes(
HelperDeclRGBuilder::getOutmostClassOrFunDecl(D));
Nodes.insert(Result.begin(), Result.end());
}
llvm::DenseSet<const Decl *> Results;
for (const auto *Node : Nodes)
Results.insert(Node->getDecl());
return Results;
}
} // namespace
std::unique_ptr<ASTConsumer>
ClangMoveAction::CreateASTConsumer(CompilerInstance &Compiler,
StringRef /*InFile*/) {
Compiler.getPreprocessor().addPPCallbacks(llvm::make_unique<FindAllIncludes>(
&Compiler.getSourceManager(), &MoveTool));
return MatchFinder.newASTConsumer();
}
ClangMoveTool::ClangMoveTool(ClangMoveContext *const Context,
DeclarationReporter *const Reporter)
: Context(Context), Reporter(Reporter) {
if (!Context->Spec.NewHeader.empty())
CCIncludes.push_back("#include \"" + Context->Spec.NewHeader + "\"\n");
}
void ClangMoveTool::addRemovedDecl(const NamedDecl *Decl) {
const auto &SM = Decl->getASTContext().getSourceManager();
auto Loc = Decl->getLocation();
StringRef FilePath = SM.getFilename(Loc);
FilePathToFileID[FilePath] = SM.getFileID(Loc);
RemovedDecls.push_back(Decl);
}
void ClangMoveTool::registerMatchers(ast_matchers::MatchFinder *Finder) {
auto InOldHeader =
isExpansionInFile(makeAbsolutePath(Context->Spec.OldHeader));
auto InOldCC = isExpansionInFile(makeAbsolutePath(Context->Spec.OldCC));
auto InOldFiles = anyOf(InOldHeader, InOldCC);
auto classTemplateForwardDecls =
classTemplateDecl(unless(has(cxxRecordDecl(isDefinition()))));
auto ForwardClassDecls = namedDecl(
anyOf(cxxRecordDecl(unless(anyOf(isImplicit(), isDefinition()))),
classTemplateForwardDecls));
auto TopLevelDecl =
hasDeclContext(anyOf(namespaceDecl(), translationUnitDecl()));
//============================================================================
// Matchers for old header
//============================================================================
// Match all top-level named declarations (e.g. function, variable, enum) in
// old header, exclude forward class declarations and namespace declarations.
//
// We consider declarations inside a class belongs to the class. So these
// declarations will be ignored.
auto AllDeclsInHeader = namedDecl(
unless(ForwardClassDecls), unless(namespaceDecl()),
unless(usingDirectiveDecl()), // using namespace decl.
notInMacro(),
InOldHeader,
hasParent(decl(anyOf(namespaceDecl(), translationUnitDecl()))),
hasDeclContext(decl(anyOf(namespaceDecl(), translationUnitDecl()))));
Finder->addMatcher(AllDeclsInHeader.bind("decls_in_header"), this);
// Don't register other matchers when dumping all declarations in header.
if (Context->DumpDeclarations)
return;
// Match forward declarations in old header.
Finder->addMatcher(namedDecl(ForwardClassDecls, InOldHeader).bind("fwd_decl"),
this);
//============================================================================
// Matchers for old cc
//============================================================================
auto IsOldCCTopLevelDecl = allOf(
hasParent(decl(anyOf(namespaceDecl(), translationUnitDecl()))), InOldCC);
// Matching using decls/type alias decls which are in named/anonymous/global
// namespace, these decls are always copied to new.h/cc. Those in classes,
// functions are covered in other matchers.
Finder->addMatcher(namedDecl(anyOf(usingDecl(IsOldCCTopLevelDecl),
usingDirectiveDecl(unless(isImplicit()),
IsOldCCTopLevelDecl),
typeAliasDecl(IsOldCCTopLevelDecl)),
notInMacro())
.bind("using_decl"),
this);
// Match static functions/variable definitions which are defined in named
// namespaces.
Optional<ast_matchers::internal::Matcher<NamedDecl>> HasAnySymbolNames;
for (StringRef SymbolName : Context->Spec.Names) {
llvm::StringRef GlobalSymbolName = SymbolName.trim().ltrim(':');
const auto HasName = hasName(("::" + GlobalSymbolName).str());
HasAnySymbolNames =
HasAnySymbolNames ? anyOf(*HasAnySymbolNames, HasName) : HasName;
}
if (!HasAnySymbolNames) {
llvm::errs() << "No symbols being moved.\n";
return;
}
auto InMovedClass =
hasOutermostEnclosingClass(cxxRecordDecl(*HasAnySymbolNames));
// Matchers for helper declarations in old.cc.
auto InAnonymousNS = hasParent(namespaceDecl(isAnonymous()));
auto NotInMovedClass= allOf(unless(InMovedClass), InOldCC);
auto IsOldCCHelper =
allOf(NotInMovedClass, anyOf(isStaticStorageClass(), InAnonymousNS));
// Match helper classes separately with helper functions/variables since we
// want to reuse these matchers in finding helpers usage below.
//
// There could be forward declarations usage for helpers, especially for
// classes and functions. We need include these forward declarations.
//
// Forward declarations for variable helpers will be excluded as these
// declarations (with "extern") are not supposed in cpp file.
auto HelperFuncOrVar =
namedDecl(notInMacro(), anyOf(functionDecl(IsOldCCHelper),
varDecl(isDefinition(), IsOldCCHelper)));
auto HelperClasses =
cxxRecordDecl(notInMacro(), NotInMovedClass, InAnonymousNS);
// Save all helper declarations in old.cc.
Finder->addMatcher(
namedDecl(anyOf(HelperFuncOrVar, HelperClasses)).bind("helper_decls"),
this);
// Construct an AST-based call graph of helper declarations in old.cc.
// In the following matcheres, "dc" is a caller while "helper_decls" and
// "used_class" is a callee, so a new edge starting from caller to callee will
// be add in the graph.
//
// Find helper function/variable usages.
Finder->addMatcher(
declRefExpr(to(HelperFuncOrVar), hasAncestor(decl().bind("dc")))
.bind("func_ref"),
&RGBuilder);
// Find helper class usages.
Finder->addMatcher(
typeLoc(loc(recordType(hasDeclaration(HelperClasses.bind("used_class")))),
hasAncestor(decl().bind("dc"))),
&RGBuilder);
//============================================================================
// Matchers for old files, including old.h/old.cc
//============================================================================
// Create a MatchCallback for class declarations.
MatchCallbacks.push_back(llvm::make_unique<ClassDeclarationMatch>(this));
// Match moved class declarations.
auto MovedClass = cxxRecordDecl(InOldFiles, *HasAnySymbolNames,
isDefinition(), TopLevelDecl)
.bind("moved_class");
Finder->addMatcher(MovedClass, MatchCallbacks.back().get());
// Match moved class methods (static methods included) which are defined
// outside moved class declaration.
Finder->addMatcher(
cxxMethodDecl(InOldFiles, ofOutermostEnclosingClass(*HasAnySymbolNames),
isDefinition())
.bind("class_method"),
MatchCallbacks.back().get());
// Match static member variable definition of the moved class.
Finder->addMatcher(
varDecl(InMovedClass, InOldFiles, isDefinition(), isStaticDataMember())
.bind("class_static_var_decl"),
MatchCallbacks.back().get());
MatchCallbacks.push_back(llvm::make_unique<FunctionDeclarationMatch>(this));
Finder->addMatcher(functionDecl(InOldFiles, *HasAnySymbolNames, TopLevelDecl)
.bind("function"),
MatchCallbacks.back().get());
MatchCallbacks.push_back(llvm::make_unique<VarDeclarationMatch>(this));
Finder->addMatcher(
varDecl(InOldFiles, *HasAnySymbolNames, TopLevelDecl).bind("var"),
MatchCallbacks.back().get());
// Match enum definition in old.h. Enum helpers (which are defined in old.cc)
// will not be moved for now no matter whether they are used or not.
MatchCallbacks.push_back(llvm::make_unique<EnumDeclarationMatch>(this));
Finder->addMatcher(
enumDecl(InOldHeader, *HasAnySymbolNames, isDefinition(), TopLevelDecl)
.bind("enum"),
MatchCallbacks.back().get());
// Match type alias in old.h, this includes "typedef" and "using" type alias
// declarations. Type alias helpers (which are defined in old.cc) will not be
// moved for now no matter whether they are used or not.
MatchCallbacks.push_back(llvm::make_unique<TypeAliasMatch>(this));
Finder->addMatcher(namedDecl(anyOf(typedefDecl().bind("typedef"),
typeAliasDecl().bind("type_alias")),
InOldHeader, *HasAnySymbolNames, TopLevelDecl),
MatchCallbacks.back().get());
}
void ClangMoveTool::run(const ast_matchers::MatchFinder::MatchResult &Result) {
if (const auto *D = Result.Nodes.getNodeAs<NamedDecl>("decls_in_header")) {
UnremovedDeclsInOldHeader.insert(D);
} else if (const auto *FWD =
Result.Nodes.getNodeAs<CXXRecordDecl>("fwd_decl")) {
// Skip all forward declarations which appear after moved class declaration.
if (RemovedDecls.empty()) {
if (const auto *DCT = FWD->getDescribedClassTemplate())
MovedDecls.push_back(DCT);
else
MovedDecls.push_back(FWD);
}
} else if (const auto *ND =
Result.Nodes.getNodeAs<NamedDecl>("helper_decls")) {
MovedDecls.push_back(ND);
HelperDeclarations.push_back(ND);
LLVM_DEBUG(llvm::dbgs() << "Add helper : " << ND->getNameAsString() << " ("
<< ND << ")\n");
} else if (const auto *UD = Result.Nodes.getNodeAs<NamedDecl>("using_decl")) {
MovedDecls.push_back(UD);
}
}
std::string ClangMoveTool::makeAbsolutePath(StringRef Path) {
return MakeAbsolutePath(Context->OriginalRunningDirectory, Path);
}
void ClangMoveTool::addIncludes(llvm::StringRef IncludeHeader, bool IsAngled,
llvm::StringRef SearchPath,
llvm::StringRef FileName,
CharSourceRange IncludeFilenameRange,
const SourceManager &SM) {
SmallVector<char, 128> HeaderWithSearchPath;
llvm::sys::path::append(HeaderWithSearchPath, SearchPath, IncludeHeader);
std::string AbsoluteIncludeHeader =
MakeAbsolutePath(SM, llvm::StringRef(HeaderWithSearchPath.data(),
HeaderWithSearchPath.size()));
std::string IncludeLine =
IsAngled ? ("#include <" + IncludeHeader + ">\n").str()
: ("#include \"" + IncludeHeader + "\"\n").str();
std::string AbsoluteOldHeader = makeAbsolutePath(Context->Spec.OldHeader);
std::string AbsoluteCurrentFile = MakeAbsolutePath(SM, FileName);
if (AbsoluteOldHeader == AbsoluteCurrentFile) {
// Find old.h includes "old.h".
if (AbsoluteOldHeader == AbsoluteIncludeHeader) {
OldHeaderIncludeRangeInHeader = IncludeFilenameRange;
return;
}
HeaderIncludes.push_back(IncludeLine);
} else if (makeAbsolutePath(Context->Spec.OldCC) == AbsoluteCurrentFile) {
// Find old.cc includes "old.h".
if (AbsoluteOldHeader == AbsoluteIncludeHeader) {
OldHeaderIncludeRangeInCC = IncludeFilenameRange;
return;
}
CCIncludes.push_back(IncludeLine);
}
}
void ClangMoveTool::removeDeclsInOldFiles() {
if (RemovedDecls.empty()) return;
// If old_header is not specified (only move declarations from old.cc), remain
// all the helper function declarations in old.cc as UnremovedDeclsInOldHeader
// is empty in this case, there is no way to verify unused/used helpers.
if (!Context->Spec.OldHeader.empty()) {
std::vector<const NamedDecl *> UnremovedDecls;
for (const auto *D : UnremovedDeclsInOldHeader)
UnremovedDecls.push_back(D);
auto UsedDecls = getUsedDecls(RGBuilder.getGraph(), UnremovedDecls);
// We remove the helper declarations which are not used in the old.cc after
// moving the given declarations.
for (const auto *D : HelperDeclarations) {
LLVM_DEBUG(llvm::dbgs() << "Check helper is used: "
<< D->getNameAsString() << " (" << D << ")\n");
if (!UsedDecls.count(HelperDeclRGBuilder::getOutmostClassOrFunDecl(
D->getCanonicalDecl()))) {
LLVM_DEBUG(llvm::dbgs() << "Helper removed in old.cc: "
<< D->getNameAsString() << " (" << D << ")\n");
RemovedDecls.push_back(D);
}
}
}
for (const auto *RemovedDecl : RemovedDecls) {
const auto &SM = RemovedDecl->getASTContext().getSourceManager();
auto Range = getFullRange(RemovedDecl);
tooling::Replacement RemoveReplacement(
SM, CharSourceRange::getCharRange(Range.getBegin(), Range.getEnd()),
"");
std::string FilePath = RemoveReplacement.getFilePath().str();
auto Err = Context->FileToReplacements[FilePath].add(RemoveReplacement);
if (Err)
llvm::errs() << llvm::toString(std::move(Err)) << "\n";
}
const auto &SM = RemovedDecls[0]->getASTContext().getSourceManager();
// Post process of cleanup around all the replacements.
for (auto &FileAndReplacements : Context->FileToReplacements) {
StringRef FilePath = FileAndReplacements.first;
// Add #include of new header to old header.
if (Context->Spec.OldDependOnNew &&
MakeAbsolutePath(SM, FilePath) ==
makeAbsolutePath(Context->Spec.OldHeader)) {
// FIXME: Minimize the include path like clang-include-fixer.
std::string IncludeNewH =
"#include \"" + Context->Spec.NewHeader + "\"\n";
// This replacment for inserting header will be cleaned up at the end.
auto Err = FileAndReplacements.second.add(
tooling::Replacement(FilePath, UINT_MAX, 0, IncludeNewH));
if (Err)
llvm::errs() << llvm::toString(std::move(Err)) << "\n";
}
auto SI = FilePathToFileID.find(FilePath);
// Ignore replacements for new.h/cc.
if (SI == FilePathToFileID.end()) continue;
llvm::StringRef Code = SM.getBufferData(SI->second);
auto Style = format::getStyle(format::DefaultFormatStyle, FilePath,
Context->FallbackStyle);
if (!Style) {
llvm::errs() << llvm::toString(Style.takeError()) << "\n";
continue;
}
auto CleanReplacements = format::cleanupAroundReplacements(
Code, Context->FileToReplacements[FilePath], *Style);
if (!CleanReplacements) {
llvm::errs() << llvm::toString(CleanReplacements.takeError()) << "\n";
continue;
}
Context->FileToReplacements[FilePath] = *CleanReplacements;
}
}
void ClangMoveTool::moveDeclsToNewFiles() {
std::vector<const NamedDecl *> NewHeaderDecls;
std::vector<const NamedDecl *> NewCCDecls;
for (const auto *MovedDecl : MovedDecls) {
if (isInHeaderFile(MovedDecl, Context->OriginalRunningDirectory,
Context->Spec.OldHeader))
NewHeaderDecls.push_back(MovedDecl);
else
NewCCDecls.push_back(MovedDecl);
}
auto UsedDecls = getUsedDecls(RGBuilder.getGraph(), RemovedDecls);
std::vector<const NamedDecl *> ActualNewCCDecls;
// Filter out all unused helpers in NewCCDecls.
// We only move the used helpers (including transively used helpers) and the
// given symbols being moved.
for (const auto *D : NewCCDecls) {
if (llvm::is_contained(HelperDeclarations, D) &&
!UsedDecls.count(HelperDeclRGBuilder::getOutmostClassOrFunDecl(
D->getCanonicalDecl())))
continue;
LLVM_DEBUG(llvm::dbgs() << "Helper used in new.cc: " << D->getNameAsString()
<< " " << D << "\n");
ActualNewCCDecls.push_back(D);
}
if (!Context->Spec.NewHeader.empty()) {
std::string OldHeaderInclude =
Context->Spec.NewDependOnOld
? "#include \"" + Context->Spec.OldHeader + "\"\n"
: "";
Context->FileToReplacements[Context->Spec.NewHeader] =
createInsertedReplacements(HeaderIncludes, NewHeaderDecls,
Context->Spec.NewHeader, /*IsHeader=*/true,
OldHeaderInclude);
}
if (!Context->Spec.NewCC.empty())
Context->FileToReplacements[Context->Spec.NewCC] =
createInsertedReplacements(CCIncludes, ActualNewCCDecls,
Context->Spec.NewCC);
}
// Move all contents from OldFile to NewFile.
void ClangMoveTool::moveAll(SourceManager &SM, StringRef OldFile,
StringRef NewFile) {
const FileEntry *FE = SM.getFileManager().getFile(makeAbsolutePath(OldFile));
if (!FE) {
llvm::errs() << "Failed to get file: " << OldFile << "\n";
return;
}
FileID ID = SM.getOrCreateFileID(FE, SrcMgr::C_User);
auto Begin = SM.getLocForStartOfFile(ID);
auto End = SM.getLocForEndOfFile(ID);
tooling::Replacement RemoveAll(SM, CharSourceRange::getCharRange(Begin, End),
"");
std::string FilePath = RemoveAll.getFilePath().str();
Context->FileToReplacements[FilePath] = tooling::Replacements(RemoveAll);
StringRef Code = SM.getBufferData(ID);
if (!NewFile.empty()) {
auto AllCode =
tooling::Replacements(tooling::Replacement(NewFile, 0, 0, Code));
auto ReplaceOldInclude = [&](CharSourceRange OldHeaderIncludeRange) {
AllCode = AllCode.merge(tooling::Replacements(tooling::Replacement(
SM, OldHeaderIncludeRange, '"' + Context->Spec.NewHeader + '"')));
};
// Fix the case where old.h/old.cc includes "old.h", we replace the
// `#include "old.h"` with `#include "new.h"`.
if (Context->Spec.NewCC == NewFile && OldHeaderIncludeRangeInCC.isValid())
ReplaceOldInclude(OldHeaderIncludeRangeInCC);
else if (Context->Spec.NewHeader == NewFile &&
OldHeaderIncludeRangeInHeader.isValid())
ReplaceOldInclude(OldHeaderIncludeRangeInHeader);
Context->FileToReplacements[NewFile] = std::move(AllCode);
}
}
void ClangMoveTool::onEndOfTranslationUnit() {
if (Context->DumpDeclarations) {
assert(Reporter);
for (const auto *Decl : UnremovedDeclsInOldHeader) {
auto Kind = Decl->getKind();
bool Templated = Decl->isTemplated();
const std::string QualifiedName = Decl->getQualifiedNameAsString();
if (Kind == Decl::Kind::Var)
Reporter->reportDeclaration(QualifiedName, "Variable", Templated);
else if (Kind == Decl::Kind::Function ||
Kind == Decl::Kind::FunctionTemplate)
Reporter->reportDeclaration(QualifiedName, "Function", Templated);
else if (Kind == Decl::Kind::ClassTemplate ||
Kind == Decl::Kind::CXXRecord)
Reporter->reportDeclaration(QualifiedName, "Class", Templated);
else if (Kind == Decl::Kind::Enum)
Reporter->reportDeclaration(QualifiedName, "Enum", Templated);
else if (Kind == Decl::Kind::Typedef || Kind == Decl::Kind::TypeAlias ||
Kind == Decl::Kind::TypeAliasTemplate)
Reporter->reportDeclaration(QualifiedName, "TypeAlias", Templated);
}
return;
}
if (RemovedDecls.empty())
return;
// Ignore symbols that are not supported when checking if there is unremoved
// symbol in old header. This makes sure that we always move old files to new
// files when all symbols produced from dump_decls are moved.
auto IsSupportedKind = [](const NamedDecl *Decl) {
switch (Decl->getKind()) {
case Decl::Kind::Function:
case Decl::Kind::FunctionTemplate:
case Decl::Kind::ClassTemplate:
case Decl::Kind::CXXRecord:
case Decl::Kind::Enum:
case Decl::Kind::Typedef:
case Decl::Kind::TypeAlias:
case Decl::Kind::TypeAliasTemplate:
case Decl::Kind::Var:
return true;
default:
return false;
}
};
if (std::none_of(UnremovedDeclsInOldHeader.begin(),
UnremovedDeclsInOldHeader.end(), IsSupportedKind) &&
!Context->Spec.OldHeader.empty()) {
auto &SM = RemovedDecls[0]->getASTContext().getSourceManager();
moveAll(SM, Context->Spec.OldHeader, Context->Spec.NewHeader);
moveAll(SM, Context->Spec.OldCC, Context->Spec.NewCC);
return;
}
LLVM_DEBUG(RGBuilder.getGraph()->dump());
moveDeclsToNewFiles();
removeDeclsInOldFiles();
}
} // namespace move
} // namespace clang
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