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replace-refs.cpp
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replace-refs.cpp
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#ifndef REPLACEREFS_H
#define REPLACEREFS_H
#include "common.h"
struct ReplaceRefs : clang::ASTFrontendAction {
static std::string shortName(const std::string & qualified) {
std::list<const_range<std::string>> splits;
boost::split(splits, qualified, [&](char c){ return c == ':'; }, boost::token_compress_on);
return { splits.back().begin(), splits.back().end() };
}
static couple<int> align(const std::string & word, const std::string & text) {
using R = const_range<std::string>;
std::list<R> matches;
boost::find_all(matches, text, word);
assert(matches.size() == 1);
R & match = matches.front();
return {
match.begin() - text.begin(),
text.size() - (match.end() - text.begin())
};
}
using Renames = std::unordered_map<std::string /* qualified original name */, std::string /* unqualified target name */>;
Renames renames;
clang::tooling::Replacements & replacements;
static const bool save = false;
ReplaceRefs(const Renames & renames, clang::tooling::Replacements & replacements) :
renames(renames), replacements(replacements) {}
struct Impl : clang::ASTConsumer, clang::RecursiveASTVisitor<Impl> {
struct Rename {
std::string originalQualified, originalShort;
std::string newName;
void operator=(const couple<std::string> & strings) {
originalQualified = strings.first;
originalShort = shortName(strings.first);
newName = strings.second;
}
};
struct Item {
Rename rename;
std::unordered_set<clang::Decl*> declarations;
std::unordered_set<clang::DeclRefExpr*> references;
};
std::unordered_map<clang::Decl*, Item> index;
const Renames & renames;
clang::tooling::Replacements & replacements;
clang::SourceManager & sourceManager;
Impl(const Renames & renames, clang::tooling::Replacements & replacements, clang::SourceManager & sourceManager) :
renames(renames), replacements(replacements), sourceManager(sourceManager) {}
void HandleTranslationUnit(clang::ASTContext & context) override { // from ASTConsumer
std::cout << "Scanning AST..." << std::endl;
TraverseDecl(context.getTranslationUnitDecl());
//dump();
addReplacements();
}
bool VisitDecl(clang::Decl * decl) { // from RecursiveASTVisitor
if(llvm::dyn_cast<clang::NamedDecl>(decl)) {
auto iter = renames.find(static_cast<clang::NamedDecl*>(decl)->getQualifiedNameAsString());
if(iter != renames.end()) {
auto & item = index[decl->getCanonicalDecl()];
item.rename = *iter;
item.declarations.insert(decl);
}
}
return true;
}
bool VisitStmt(clang::Stmt * stmt) { // from RecursiveASTVisitor
if(llvm::dyn_cast<clang::DeclRefExpr>(stmt)) {
auto iter = index.find(static_cast<clang::DeclRefExpr*>(stmt)->getDecl()->getCanonicalDecl());
if(iter != index.end()) iter->second.references.insert(static_cast<clang::DeclRefExpr*>(stmt));
}
return true;
}
template<class X> llvm::StringRef nodeText(const X * xpr) const {
auto start = sourceManager.getSpellingLoc(xpr->getLocStart()), end = sourceManager.getSpellingLoc(xpr->getLocEnd());
return {
sourceManager.getCharacterData(start),
sourceManager.getDecomposedLoc(clang::Lexer::getLocForEndOfToken(end, 0, sourceManager, clang::LangOptions())).second
- sourceManager.getDecomposedLoc(start).second
};
}
template<class X> void addReplacement(const X * xpr, const std::string & original, const std::string & replacement) {
auto text = nodeText(xpr);
auto range = clang::CharSourceRange::getTokenRange(xpr->getSourceRange());
auto p = align(original, text);
std::cout << '\t' << std::string(text.begin() + p.first, text.end() - p.second) << " ==> " << replacement << std::endl;
clang::CharSourceRange target{
clang::SourceRange(range.getBegin().getLocWithOffset(p.first), range.getEnd().getLocWithOffset(-p.second)),
true
};
replacements.emplace(sourceManager, target, llvm::StringRef(replacement));
}
void addReplacements() {
std::cout << "computing patch..." << std::endl;
for(auto & ip : index) {
for(auto decl : ip.second.declarations) addReplacement(decl, ip.second.rename.originalShort, ip.second.rename.newName);
for(auto ref : ip.second.references) addReplacement(ref, ip.second.rename.originalShort, ip.second.rename.newName);
}
}
void dump() const {
for(auto & ip : index) {
std::cout << ip.second.rename.originalQualified << " ==> " << ip.second.rename.newName << std::endl;
std::cout << '\t' << "cannonical declaration : " << ip.first << std::endl;
std::cout << '\t' << "declarations:" << std::endl;
for(auto decl : ip.second.declarations) std::cout << "\t\t" << decl << std::endl;
std::cout << '\t' << "referencing expressions:" << std::endl;
for(auto ref : ip.second.references) std::cout << "\t\t" << ref << std::endl;
}
}
}; // Impl
static clang::tooling::FrontendActionFactory * newFactory(const Renames & renames, clang::tooling::Replacements & replacements) {
struct Factory : clang::tooling::FrontendActionFactory {
const Renames & renames;
clang::tooling::Replacements & replacements;
Factory(const Renames & renames, clang::tooling::Replacements & replacements) : renames(renames), replacements(replacements) {}
clang::FrontendAction *create() override { return new ReplaceRefs(renames, replacements); }
};
return new Factory(renames, replacements);
}
virtual Impl* CreateASTConsumer(clang::CompilerInstance& ci, llvm::StringRef) override {
return new Impl(renames, replacements, ci.getSourceManager());
}
static int run(const clang::tooling::CompilationDatabase & db, llvm::ArrayRef<std::string> sources, const Renames & renames) {
clang::tooling::RefactoringTool tool(db, sources);
auto factory = newFactory(renames, tool.getReplacements());
if(save)
return tool.runAndSave(factory);
else {
int ret = tool.run(factory);
std::cout << "\nPatch shown below:" << std::endl;
for(auto & replacement : tool.getReplacements()) std::cout << " " << replacement.toString() << std::endl;
return ret;
}
}
};
namespace tools {
int replace_refs(const clang::tooling::CompilationDatabase & db, llvm::ArrayRef<std::string> sources, const std::unordered_map<std::string, std::string> & renames) {
return ReplaceRefs::run(db, sources, renames);
}
}
#endif // REPLACEREFS_H