static bool swiftCodeCompleteImpl(SwiftLangSupport &Lang,
llvm::MemoryBuffer *UnresolvedInputFile,
unsigned Offset,
SwiftCodeCompletionConsumer &SwiftConsumer,
ArrayRef<const char *> Args,
std::string &Error) {
trace::TracedOperation TracedOp;
if (trace::enabled()) {
trace::SwiftInvocation SwiftArgs;
trace::initTraceInfo(SwiftArgs,
UnresolvedInputFile->getBufferIdentifier(),
Args);
SwiftArgs.addFile(UnresolvedInputFile->getBufferIdentifier(),
UnresolvedInputFile->getBuffer());
TracedOp.start(trace::OperationKind::CodeCompletionInit, SwiftArgs,
{ std::make_pair("Offset", std::to_string(Offset)),
std::make_pair("InputBufferSize",
std::to_string(UnresolvedInputFile->getBufferSize()))});
}
// Resolve symlinks for the input file; we resolve them for the input files
// in the arguments as well.
// FIXME: We need the Swift equivalent of Clang's FileEntry.
auto InputFile = llvm::MemoryBuffer::getMemBuffer(
UnresolvedInputFile->getBuffer(),
Lang.resolvePathSymlinks(UnresolvedInputFile->getBufferIdentifier()));
CompilerInstance CI;
// Display diagnostics to stderr.
PrintingDiagnosticConsumer PrintDiags;
CI.addDiagnosticConsumer(&PrintDiags);
CompilerInvocation Invocation;
bool Failed = Lang.getASTManager().initCompilerInvocation(
Invocation, Args, CI.getDiags(), InputFile->getBufferIdentifier(), Error);
if (Failed) {
return false;
}
if (Invocation.getInputFilenames().empty()) {
Error = "no input filenames specified";
return false;
}
auto origBuffSize = InputFile->getBufferSize();
unsigned CodeCompletionOffset = Offset;
if (CodeCompletionOffset > origBuffSize) {
CodeCompletionOffset = origBuffSize;
}
const char *Position = InputFile->getBufferStart() + CodeCompletionOffset;
std::unique_ptr<llvm::MemoryBuffer> NewBuffer =
llvm::MemoryBuffer::getNewUninitMemBuffer(InputFile->getBufferSize() + 1,
InputFile->getBufferIdentifier());
char *NewBuf = const_cast<char*>(NewBuffer->getBufferStart());
char *NewPos = std::copy(InputFile->getBufferStart(), Position, NewBuf);
*NewPos = '\0';
std::copy(Position, InputFile->getBufferEnd(), NewPos+1);
Invocation.setCodeCompletionPoint(NewBuffer.get(), CodeCompletionOffset);
auto swiftCache = Lang.getCodeCompletionCache(); // Pin the cache.
ide::CodeCompletionContext CompletionContext(swiftCache->getCache());
// Create a factory for code completion callbacks that will feed the
// Consumer.
std::unique_ptr<CodeCompletionCallbacksFactory> CompletionCallbacksFactory(
ide::makeCodeCompletionCallbacksFactory(CompletionContext,
SwiftConsumer));
Invocation.setCodeCompletionFactory(CompletionCallbacksFactory.get());
// FIXME: We need to be passing the buffers from the open documents.
// It is not a huge problem in practice because Xcode auto-saves constantly.
if (CI.setup(Invocation)) {
// FIXME: error?
return true;
}
TracedOp.finish();
if (trace::enabled()) {
trace::SwiftInvocation SwiftArgs;
trace::initTraceInfo(SwiftArgs, InputFile->getBufferIdentifier(), Args);
trace::initTraceFiles(SwiftArgs, CI);
// Replace primary file with original content
std::for_each(SwiftArgs.Files.begin(), SwiftArgs.Files.end(),
[&] (trace::StringPairs::value_type &Pair) {
if (Pair.first == InputFile->getBufferIdentifier()) {
Pair.second = InputFile->getBuffer();
}
});
TracedOp.start(trace::OperationKind::CodeCompletion, SwiftArgs,
{std::make_pair("OriginalOffset", std::to_string(Offset)),
std::make_pair("Offset",
std::to_string(CodeCompletionOffset))});
}
CloseClangModuleFiles scopedCloseFiles(
*CI.getASTContext().getClangModuleLoader());
SwiftConsumer.setContext(&CI.getASTContext(), &Invocation,
&CompletionContext);
CI.performSema();
SwiftConsumer.clearContext();
return true;
}
static void resolveCursor(SwiftLangSupport &Lang,
StringRef InputFile, unsigned Offset,
SwiftInvocationRef Invok,
bool TryExistingAST,
std::function<void(const CursorInfo &)> Receiver) {
assert(Invok);
class CursorInfoConsumer : public SwiftASTConsumer {
std::string InputFile;
unsigned Offset;
SwiftLangSupport ⟪
SwiftInvocationRef ASTInvok;
const bool TryExistingAST;
std::function<void(const CursorInfo &)> Receiver;
SmallVector<ImmutableTextSnapshotRef, 4> PreviousASTSnaps;
public:
CursorInfoConsumer(StringRef InputFile, unsigned Offset,
SwiftLangSupport &Lang,
SwiftInvocationRef ASTInvok,
bool TryExistingAST,
std::function<void(const CursorInfo &)> Receiver)
: InputFile(InputFile), Offset(Offset),
Lang(Lang),
ASTInvok(std::move(ASTInvok)),
TryExistingAST(TryExistingAST),
Receiver(std::move(Receiver)) { }
bool canUseASTWithSnapshots(
ArrayRef<ImmutableTextSnapshotRef> Snapshots) override {
if (!TryExistingAST) {
LOG_INFO_FUNC(High, "will resolve using up-to-date AST");
return false;
}
// If there is an existing AST and the offset can be mapped back to the
// document snapshot that was used to create it, then use that AST.
// The downside is that we may return stale information, but we get the
// benefit of increased responsiveness, since the request will not be
// blocked waiting on the AST to be fully typechecked.
ImmutableTextSnapshotRef InputSnap;
if (auto EditorDoc = Lang.getEditorDocuments().findByPath(InputFile))
InputSnap = EditorDoc->getLatestSnapshot();
if (!InputSnap)
return false;
auto mappedBackOffset = [&]()->llvm::Optional<unsigned> {
for (auto &Snap : Snapshots) {
if (Snap->isFromSameBuffer(InputSnap)) {
if (Snap->getStamp() == InputSnap->getStamp())
return Offset;
auto OptOffset = mapOffsetToOlderSnapshot(Offset, InputSnap, Snap);
if (!OptOffset.hasValue())
return None;
// Check that the new and old offset still point to the same token.
StringRef NewTok = getSourceToken(Offset, InputSnap);
if (NewTok.empty())
return None;
if (NewTok == getSourceToken(OptOffset.getValue(), Snap))
return OptOffset;
return None;
}
}
return None;
};
auto OldOffsetOpt = mappedBackOffset();
if (OldOffsetOpt.hasValue()) {
Offset = *OldOffsetOpt;
PreviousASTSnaps.append(Snapshots.begin(), Snapshots.end());
LOG_INFO_FUNC(High, "will try existing AST");
return true;
}
LOG_INFO_FUNC(High, "will resolve using up-to-date AST");
return false;
}
void handlePrimaryAST(ASTUnitRef AstUnit) override {
auto &CompIns = AstUnit->getCompilerInstance();
Module *MainModule = CompIns.getMainModule();
unsigned BufferID = AstUnit->getPrimarySourceFile().getBufferID().getValue();
SourceLoc Loc =
Lexer::getLocForStartOfToken(CompIns.getSourceMgr(), BufferID, Offset);
if (Loc.isInvalid()) {
Receiver({});
return;
}
trace::TracedOperation TracedOp;
if (trace::enabled()) {
trace::SwiftInvocation SwiftArgs;
ASTInvok->raw(SwiftArgs.Args.Args, SwiftArgs.Args.PrimaryFile);
trace::initTraceFiles(SwiftArgs, CompIns);
TracedOp.start(trace::OperationKind::CursorInfoForSource, SwiftArgs,
{std::make_pair("Offset", std::to_string(Offset))});
}
SemaLocResolver Resolver(AstUnit->getPrimarySourceFile());
SemaToken SemaTok = Resolver.resolve(Loc);
if (SemaTok.isInvalid()) {
Receiver({});
return;
}
CompilerInvocation CompInvok;
ASTInvok->applyTo(CompInvok);
if (SemaTok.Mod) {
passCursorInfoForModule(SemaTok.Mod, Lang.getIFaceGenContexts(),
CompInvok, Receiver);
} else {
ValueDecl *VD = SemaTok.CtorTyRef ? SemaTok.CtorTyRef : SemaTok.ValueD;
bool Failed = passCursorInfoForDecl(VD, MainModule, SemaTok.Ty,
SemaTok.IsRef, BufferID, Lang,
CompInvok, PreviousASTSnaps,
Receiver);
if (Failed) {
if (!PreviousASTSnaps.empty()) {
// Attempt again using the up-to-date AST.
resolveCursor(Lang, InputFile, Offset, ASTInvok,
/*TryExistingAST=*/false, Receiver);
} else {
Receiver({});
}
}
}
}
void cancelled() override {
CursorInfo Info;
Info.IsCancelled = true;
Receiver(Info);
}
void failed(StringRef Error) override {
LOG_WARN_FUNC("cursor info failed: " << Error);
Receiver({});
}
};
auto Consumer = std::make_shared<CursorInfoConsumer>(
InputFile, Offset, Lang, Invok, TryExistingAST, Receiver);
/// FIXME: When request cancellation is implemented and Xcode adopts it,
/// don't use 'OncePerASTToken'.
static const char OncePerASTToken = 0;
Lang.getASTManager().processASTAsync(Invok, std::move(Consumer), &OncePerASTToken);
}
