311 lines
11 KiB
C++
311 lines
11 KiB
C++
//===--- Refactoring.cpp - Framework for clang refactoring tools ----------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// Implements tools to support refactorings.
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//
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//===----------------------------------------------------------------------===//
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#include "clang/Basic/DiagnosticOptions.h"
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#include "clang/Basic/FileManager.h"
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#include "clang/Basic/SourceManager.h"
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#include "clang/Frontend/TextDiagnosticPrinter.h"
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#include "clang/Lex/Lexer.h"
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#include "clang/Rewrite/Core/Rewriter.h"
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#include "clang/Tooling/Refactoring.h"
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#include "llvm/Support/FileSystem.h"
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#include "llvm/Support/Path.h"
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#include "llvm/Support/raw_os_ostream.h"
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namespace clang {
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namespace tooling {
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static const char * const InvalidLocation = "";
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Replacement::Replacement()
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: FilePath(InvalidLocation) {}
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Replacement::Replacement(StringRef FilePath, unsigned Offset, unsigned Length,
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StringRef ReplacementText)
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: FilePath(FilePath), ReplacementRange(Offset, Length),
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ReplacementText(ReplacementText) {}
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Replacement::Replacement(const SourceManager &Sources, SourceLocation Start,
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unsigned Length, StringRef ReplacementText) {
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setFromSourceLocation(Sources, Start, Length, ReplacementText);
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}
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Replacement::Replacement(const SourceManager &Sources,
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const CharSourceRange &Range,
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StringRef ReplacementText) {
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setFromSourceRange(Sources, Range, ReplacementText);
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}
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bool Replacement::isApplicable() const {
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return FilePath != InvalidLocation;
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}
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bool Replacement::apply(Rewriter &Rewrite) const {
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SourceManager &SM = Rewrite.getSourceMgr();
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const FileEntry *Entry = SM.getFileManager().getFile(FilePath);
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if (!Entry)
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return false;
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FileID ID;
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// FIXME: Use SM.translateFile directly.
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SourceLocation Location = SM.translateFileLineCol(Entry, 1, 1);
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ID = Location.isValid() ?
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SM.getFileID(Location) :
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SM.createFileID(Entry, SourceLocation(), SrcMgr::C_User);
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// FIXME: We cannot check whether Offset + Length is in the file, as
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// the remapping API is not public in the RewriteBuffer.
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const SourceLocation Start =
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SM.getLocForStartOfFile(ID).
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getLocWithOffset(ReplacementRange.getOffset());
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// ReplaceText returns false on success.
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// ReplaceText only fails if the source location is not a file location, in
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// which case we already returned false earlier.
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bool RewriteSucceeded = !Rewrite.ReplaceText(
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Start, ReplacementRange.getLength(), ReplacementText);
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assert(RewriteSucceeded);
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return RewriteSucceeded;
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}
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std::string Replacement::toString() const {
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std::string result;
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llvm::raw_string_ostream stream(result);
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stream << FilePath << ": " << ReplacementRange.getOffset() << ":+"
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<< ReplacementRange.getLength() << ":\"" << ReplacementText << "\"";
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return result;
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}
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bool operator<(const Replacement &LHS, const Replacement &RHS) {
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if (LHS.getOffset() != RHS.getOffset())
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return LHS.getOffset() < RHS.getOffset();
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if (LHS.getLength() != RHS.getLength())
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return LHS.getLength() < RHS.getLength();
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if (LHS.getFilePath() != RHS.getFilePath())
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return LHS.getFilePath() < RHS.getFilePath();
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return LHS.getReplacementText() < RHS.getReplacementText();
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}
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bool operator==(const Replacement &LHS, const Replacement &RHS) {
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return LHS.getOffset() == RHS.getOffset() &&
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LHS.getLength() == RHS.getLength() &&
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LHS.getFilePath() == RHS.getFilePath() &&
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LHS.getReplacementText() == RHS.getReplacementText();
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}
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void Replacement::setFromSourceLocation(const SourceManager &Sources,
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SourceLocation Start, unsigned Length,
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StringRef ReplacementText) {
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const std::pair<FileID, unsigned> DecomposedLocation =
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Sources.getDecomposedLoc(Start);
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const FileEntry *Entry = Sources.getFileEntryForID(DecomposedLocation.first);
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if (Entry) {
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// Make FilePath absolute so replacements can be applied correctly when
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// relative paths for files are used.
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llvm::SmallString<256> FilePath(Entry->getName());
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std::error_code EC = llvm::sys::fs::make_absolute(FilePath);
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this->FilePath = EC ? FilePath.c_str() : Entry->getName();
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} else {
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this->FilePath = InvalidLocation;
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}
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this->ReplacementRange = Range(DecomposedLocation.second, Length);
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this->ReplacementText = ReplacementText;
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}
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// FIXME: This should go into the Lexer, but we need to figure out how
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// to handle ranges for refactoring in general first - there is no obvious
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// good way how to integrate this into the Lexer yet.
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static int getRangeSize(const SourceManager &Sources,
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const CharSourceRange &Range) {
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SourceLocation SpellingBegin = Sources.getSpellingLoc(Range.getBegin());
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SourceLocation SpellingEnd = Sources.getSpellingLoc(Range.getEnd());
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std::pair<FileID, unsigned> Start = Sources.getDecomposedLoc(SpellingBegin);
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std::pair<FileID, unsigned> End = Sources.getDecomposedLoc(SpellingEnd);
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if (Start.first != End.first) return -1;
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if (Range.isTokenRange())
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End.second += Lexer::MeasureTokenLength(SpellingEnd, Sources,
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LangOptions());
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return End.second - Start.second;
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}
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void Replacement::setFromSourceRange(const SourceManager &Sources,
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const CharSourceRange &Range,
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StringRef ReplacementText) {
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setFromSourceLocation(Sources, Sources.getSpellingLoc(Range.getBegin()),
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getRangeSize(Sources, Range), ReplacementText);
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}
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bool applyAllReplacements(const Replacements &Replaces, Rewriter &Rewrite) {
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bool Result = true;
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for (Replacements::const_iterator I = Replaces.begin(),
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E = Replaces.end();
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I != E; ++I) {
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if (I->isApplicable()) {
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Result = I->apply(Rewrite) && Result;
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} else {
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Result = false;
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}
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}
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return Result;
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}
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// FIXME: Remove this function when Replacements is implemented as std::vector
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// instead of std::set.
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bool applyAllReplacements(const std::vector<Replacement> &Replaces,
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Rewriter &Rewrite) {
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bool Result = true;
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for (std::vector<Replacement>::const_iterator I = Replaces.begin(),
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E = Replaces.end();
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I != E; ++I) {
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if (I->isApplicable()) {
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Result = I->apply(Rewrite) && Result;
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} else {
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Result = false;
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}
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}
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return Result;
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}
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std::string applyAllReplacements(StringRef Code, const Replacements &Replaces) {
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FileManager Files((FileSystemOptions()));
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DiagnosticsEngine Diagnostics(
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IntrusiveRefCntPtr<DiagnosticIDs>(new DiagnosticIDs),
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new DiagnosticOptions);
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Diagnostics.setClient(new TextDiagnosticPrinter(
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llvm::outs(), &Diagnostics.getDiagnosticOptions()));
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SourceManager SourceMgr(Diagnostics, Files);
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Rewriter Rewrite(SourceMgr, LangOptions());
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llvm::MemoryBuffer *Buf = llvm::MemoryBuffer::getMemBuffer(Code, "<stdin>");
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const clang::FileEntry *Entry =
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Files.getVirtualFile("<stdin>", Buf->getBufferSize(), 0);
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SourceMgr.overrideFileContents(Entry, Buf);
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FileID ID =
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SourceMgr.createFileID(Entry, SourceLocation(), clang::SrcMgr::C_User);
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for (Replacements::const_iterator I = Replaces.begin(), E = Replaces.end();
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I != E; ++I) {
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Replacement Replace("<stdin>", I->getOffset(), I->getLength(),
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I->getReplacementText());
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if (!Replace.apply(Rewrite))
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return "";
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}
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std::string Result;
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llvm::raw_string_ostream OS(Result);
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Rewrite.getEditBuffer(ID).write(OS);
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OS.flush();
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return Result;
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}
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unsigned shiftedCodePosition(const Replacements &Replaces, unsigned Position) {
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unsigned NewPosition = Position;
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for (Replacements::iterator I = Replaces.begin(), E = Replaces.end(); I != E;
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++I) {
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if (I->getOffset() >= Position)
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break;
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if (I->getOffset() + I->getLength() > Position)
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NewPosition += I->getOffset() + I->getLength() - Position;
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NewPosition += I->getReplacementText().size() - I->getLength();
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}
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return NewPosition;
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}
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// FIXME: Remove this function when Replacements is implemented as std::vector
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// instead of std::set.
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unsigned shiftedCodePosition(const std::vector<Replacement> &Replaces,
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unsigned Position) {
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unsigned NewPosition = Position;
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for (std::vector<Replacement>::const_iterator I = Replaces.begin(),
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E = Replaces.end();
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I != E; ++I) {
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if (I->getOffset() >= Position)
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break;
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if (I->getOffset() + I->getLength() > Position)
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NewPosition += I->getOffset() + I->getLength() - Position;
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NewPosition += I->getReplacementText().size() - I->getLength();
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}
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return NewPosition;
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}
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void deduplicate(std::vector<Replacement> &Replaces,
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std::vector<Range> &Conflicts) {
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if (Replaces.empty())
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return;
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// Deduplicate
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std::sort(Replaces.begin(), Replaces.end());
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std::vector<Replacement>::iterator End =
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std::unique(Replaces.begin(), Replaces.end());
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Replaces.erase(End, Replaces.end());
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// Detect conflicts
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Range ConflictRange(Replaces.front().getOffset(),
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Replaces.front().getLength());
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unsigned ConflictStart = 0;
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unsigned ConflictLength = 1;
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for (unsigned i = 1; i < Replaces.size(); ++i) {
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Range Current(Replaces[i].getOffset(), Replaces[i].getLength());
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if (ConflictRange.overlapsWith(Current)) {
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// Extend conflicted range
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ConflictRange = Range(ConflictRange.getOffset(),
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std::max(ConflictRange.getLength(),
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Current.getOffset() + Current.getLength() -
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ConflictRange.getOffset()));
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++ConflictLength;
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} else {
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if (ConflictLength > 1)
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Conflicts.push_back(Range(ConflictStart, ConflictLength));
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ConflictRange = Current;
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ConflictStart = i;
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ConflictLength = 1;
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}
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}
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if (ConflictLength > 1)
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Conflicts.push_back(Range(ConflictStart, ConflictLength));
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}
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RefactoringTool::RefactoringTool(const CompilationDatabase &Compilations,
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ArrayRef<std::string> SourcePaths)
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: ClangTool(Compilations, SourcePaths) {}
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Replacements &RefactoringTool::getReplacements() { return Replace; }
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int RefactoringTool::runAndSave(FrontendActionFactory *ActionFactory) {
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if (int Result = run(ActionFactory)) {
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return Result;
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}
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LangOptions DefaultLangOptions;
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IntrusiveRefCntPtr<DiagnosticOptions> DiagOpts = new DiagnosticOptions();
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TextDiagnosticPrinter DiagnosticPrinter(llvm::errs(), &*DiagOpts);
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DiagnosticsEngine Diagnostics(
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IntrusiveRefCntPtr<DiagnosticIDs>(new DiagnosticIDs()),
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&*DiagOpts, &DiagnosticPrinter, false);
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SourceManager Sources(Diagnostics, getFiles());
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Rewriter Rewrite(Sources, DefaultLangOptions);
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if (!applyAllReplacements(Rewrite)) {
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llvm::errs() << "Skipped some replacements.\n";
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}
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return saveRewrittenFiles(Rewrite);
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}
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bool RefactoringTool::applyAllReplacements(Rewriter &Rewrite) {
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return tooling::applyAllReplacements(Replace, Rewrite);
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}
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int RefactoringTool::saveRewrittenFiles(Rewriter &Rewrite) {
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return Rewrite.overwriteChangedFiles() ? 1 : 0;
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}
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} // end namespace tooling
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} // end namespace clang
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