--- /dev/null
+//===-- import-test.cpp - ASTImporter/ExternalASTSource testbed -----------===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include "clang/AST/ASTContext.h"
+#include "clang/AST/ASTImporter.h"
+#include "clang/Basic/Builtins.h"
+#include "clang/Basic/IdentifierTable.h"
+#include "clang/Basic/SourceLocation.h"
+#include "clang/Basic/TargetInfo.h"
+#include "clang/Basic/TargetOptions.h"
+#include "clang/CodeGen/ModuleBuilder.h"
+#include "clang/Frontend/CompilerInstance.h"
+#include "clang/Frontend/TextDiagnosticBuffer.h"
+#include "clang/Lex/Lexer.h"
+#include "clang/Lex/Preprocessor.h"
+#include "clang/Parse/ParseAST.h"
+
+#include "llvm/IR/LLVMContext.h"
+#include "llvm/Support/CommandLine.h"
+#include "llvm/Support/Error.h"
+#include "llvm/Support/Host.h"
+#include "llvm/Support/Signals.h"
+
+#include <memory>
+#include <string>
+
+using namespace clang;
+
+static llvm::cl::opt<std::string> Expression(
+ "expression", llvm::cl::Required,
+ llvm::cl::desc("Path to a file containing the expression to parse"));
+
+static llvm::cl::list<std::string>
+ Imports("import", llvm::cl::ZeroOrMore,
+ llvm::cl::desc("Path to a file containing declarations to import"));
+
+static llvm::cl::list<std::string>
+ ClangArgs("Xcc", llvm::cl::ZeroOrMore,
+ llvm::cl::desc("Argument to pass to the CompilerInvocation"),
+ llvm::cl::CommaSeparated);
+
+namespace init_convenience {
+class TestDiagnosticConsumer : public DiagnosticConsumer {
+private:
+ std::unique_ptr<TextDiagnosticBuffer> Passthrough;
+ const LangOptions *LangOpts = nullptr;
+
+public:
+ TestDiagnosticConsumer()
+ : Passthrough(llvm::make_unique<TextDiagnosticBuffer>()) {}
+
+ virtual void BeginSourceFile(const LangOptions &LangOpts,
+ const Preprocessor *PP = nullptr) override {
+ this->LangOpts = &LangOpts;
+ return Passthrough->BeginSourceFile(LangOpts, PP);
+ }
+
+ virtual void EndSourceFile() override {
+ this->LangOpts = nullptr;
+ Passthrough->EndSourceFile();
+ }
+
+ virtual bool IncludeInDiagnosticCounts() const override {
+ return Passthrough->IncludeInDiagnosticCounts();
+ }
+
+private:
+ static void PrintSourceForLocation(const SourceLocation &Loc,
+ SourceManager &SM) {
+ const char *LocData = SM.getCharacterData(Loc, /*Invalid=*/nullptr);
+ unsigned LocColumn =
+ SM.getSpellingColumnNumber(Loc, /*Invalid=*/nullptr) - 1;
+ FileID FID = SM.getFileID(Loc);
+ llvm::MemoryBuffer *Buffer = SM.getBuffer(FID, Loc, /*Invalid=*/nullptr);
+
+ assert(LocData >= Buffer->getBufferStart() &&
+ LocData < Buffer->getBufferEnd());
+
+ const char *LineBegin = LocData - LocColumn;
+
+ assert(LineBegin >= Buffer->getBufferStart());
+
+ const char *LineEnd = nullptr;
+
+ for (LineEnd = LineBegin; *LineEnd != '\n' && *LineEnd != '\r' &&
+ LineEnd < Buffer->getBufferEnd();
+ ++LineEnd)
+ ;
+
+ llvm::StringRef LineString(LineBegin, LineEnd - LineBegin);
+
+ llvm::errs() << LineString << '\n';
+ llvm::errs().indent(LocColumn);
+ llvm::errs() << '^';
+ }
+
+ virtual void HandleDiagnostic(DiagnosticsEngine::Level DiagLevel,
+ const Diagnostic &Info) override {
+ if (Info.hasSourceManager() && LangOpts) {
+ SourceManager &SM = Info.getSourceManager();
+
+ if (Info.getLocation().isValid()) {
+ Info.getLocation().print(llvm::errs(), SM);
+ llvm::errs() << ": ";
+ }
+
+ SmallString<16> DiagText;
+ Info.FormatDiagnostic(DiagText);
+ llvm::errs() << DiagText << '\n';
+
+ if (Info.getLocation().isValid()) {
+ PrintSourceForLocation(Info.getLocation(), SM);
+ }
+
+ for (const CharSourceRange &Range : Info.getRanges()) {
+ bool Invalid = true;
+ StringRef Ref = Lexer::getSourceText(Range, SM, *LangOpts, &Invalid);
+ if (!Invalid) {
+ llvm::errs() << Ref << '\n';
+ }
+ }
+ }
+ DiagnosticConsumer::HandleDiagnostic(DiagLevel, Info);
+ }
+};
+
+std::unique_ptr<CompilerInstance>
+BuildCompilerInstance(ArrayRef<const char *> ClangArgv) {
+ auto Ins = llvm::make_unique<CompilerInstance>();
+ auto DC = llvm::make_unique<TestDiagnosticConsumer>();
+ const bool ShouldOwnClient = true;
+ Ins->createDiagnostics(DC.release(), ShouldOwnClient);
+
+ auto Inv = llvm::make_unique<CompilerInvocation>();
+
+ CompilerInvocation::CreateFromArgs(*Inv, ClangArgv.data(),
+ &ClangArgv.data()[ClangArgv.size()],
+ Ins->getDiagnostics());
+
+ Inv->getLangOpts()->CPlusPlus = true;
+ Inv->getLangOpts()->CPlusPlus11 = true;
+ Inv->getHeaderSearchOpts().UseLibcxx = true;
+ Inv->getLangOpts()->Bool = true;
+ Inv->getLangOpts()->WChar = true;
+ Inv->getLangOpts()->Blocks = true;
+ Inv->getLangOpts()->DebuggerSupport = true;
+ Inv->getLangOpts()->SpellChecking = false;
+ Inv->getLangOpts()->ThreadsafeStatics = false;
+ Inv->getLangOpts()->AccessControl = false;
+ Inv->getLangOpts()->DollarIdents = true;
+ Inv->getCodeGenOpts().setDebugInfo(codegenoptions::FullDebugInfo);
+ Inv->getTargetOpts().Triple = llvm::sys::getDefaultTargetTriple();
+
+ Ins->setInvocation(Inv.release());
+
+ TargetInfo *TI = TargetInfo::CreateTargetInfo(
+ Ins->getDiagnostics(), Ins->getInvocation().TargetOpts);
+ Ins->setTarget(TI);
+ Ins->getTarget().adjust(Ins->getLangOpts());
+ Ins->createFileManager();
+ Ins->createSourceManager(Ins->getFileManager());
+ Ins->createPreprocessor(TU_Complete);
+
+ return Ins;
+}
+
+std::unique_ptr<ASTContext>
+BuildASTContext(CompilerInstance &CI, SelectorTable &ST, Builtin::Context &BC) {
+ auto AST = llvm::make_unique<ASTContext>(
+ CI.getLangOpts(), CI.getSourceManager(),
+ CI.getPreprocessor().getIdentifierTable(), ST, BC);
+ AST->InitBuiltinTypes(CI.getTarget());
+ return AST;
+}
+
+std::unique_ptr<CodeGenerator> BuildCodeGen(CompilerInstance &CI,
+ llvm::LLVMContext &LLVMCtx) {
+ StringRef ModuleName("$__module");
+ return std::unique_ptr<CodeGenerator>(CreateLLVMCodeGen(
+ CI.getDiagnostics(), ModuleName, CI.getHeaderSearchOpts(),
+ CI.getPreprocessorOpts(), CI.getCodeGenOpts(), LLVMCtx));
+}
+} // end namespace
+
+namespace {
+class TestExternalASTSource : public ExternalASTSource {
+private:
+ llvm::ArrayRef<std::unique_ptr<CompilerInstance>> ImportCIs;
+ std::map<CompilerInstance *, std::unique_ptr<ASTImporter>> ForwardImporters;
+ std::map<CompilerInstance *, std::unique_ptr<ASTImporter>> ReverseImporters;
+
+public:
+ TestExternalASTSource(
+ CompilerInstance &ExpressionCI,
+ llvm::ArrayRef<std::unique_ptr<CompilerInstance>> ImportCIs)
+ : ImportCIs(ImportCIs) {
+ for (const std::unique_ptr<CompilerInstance> &ImportCI : ImportCIs) {
+ ForwardImporters[ImportCI.get()] = llvm::make_unique<ASTImporter>(
+ ExpressionCI.getASTContext(), ExpressionCI.getFileManager(),
+ ImportCI->getASTContext(), ImportCI->getFileManager(),
+ /*MinimalImport=*/true);
+ ReverseImporters[ImportCI.get()] = llvm::make_unique<ASTImporter>(
+ ImportCI->getASTContext(), ImportCI->getFileManager(),
+ ExpressionCI.getASTContext(), ExpressionCI.getFileManager(),
+ /*MinimalImport=*/true);
+ }
+ }
+
+ bool FindExternalVisibleDeclsByName(const DeclContext *DC,
+ DeclarationName Name) override {
+ llvm::SmallVector<NamedDecl *, 1> Decls;
+
+ if (isa<TranslationUnitDecl>(DC)) {
+ for (const std::unique_ptr<CompilerInstance> &I : ImportCIs) {
+ DeclarationName FromName = ReverseImporters[I.get()]->Import(Name);
+ DeclContextLookupResult Result =
+ I->getASTContext().getTranslationUnitDecl()->lookup(FromName);
+ for (NamedDecl *FromD : Result) {
+ NamedDecl *D =
+ llvm::cast<NamedDecl>(ForwardImporters[I.get()]->Import(FromD));
+ Decls.push_back(D);
+ }
+ }
+ }
+ if (Decls.empty()) {
+ return false;
+ } else {
+ SetExternalVisibleDeclsForName(DC, Name, Decls);
+ return true;
+ }
+ }
+};
+
+void AddExternalSource(
+ CompilerInstance &CI,
+ llvm::ArrayRef<std::unique_ptr<CompilerInstance>> Imports) {
+ ASTContext &AST = CI.getASTContext();
+ auto ES = llvm::make_unique<TestExternalASTSource>(CI, Imports);
+ AST.setExternalSource(ES.release());
+ AST.getTranslationUnitDecl()->setHasExternalVisibleStorage();
+}
+
+llvm::Error ParseSource(const std::string &Path, CompilerInstance &CI,
+ CodeGenerator &CG) {
+ SourceManager &SM = CI.getSourceManager();
+ const FileEntry *FE = CI.getFileManager().getFile(Path);
+ if (!FE) {
+ return llvm::make_error<llvm::StringError>(
+ llvm::Twine("Couldn't open ", Path), std::error_code());
+ }
+ SM.setMainFileID(SM.createFileID(FE, SourceLocation(), SrcMgr::C_User));
+ ParseAST(CI.getPreprocessor(), &CG, CI.getASTContext());
+ return llvm::Error::success();
+}
+
+llvm::Expected<std::unique_ptr<CompilerInstance>>
+Parse(const std::string &Path,
+ llvm::ArrayRef<std::unique_ptr<CompilerInstance>> Imports) {
+ std::vector<const char *> ClangArgv(ClangArgs.size());
+ std::transform(ClangArgs.begin(), ClangArgs.end(), ClangArgv.begin(),
+ [](const std::string &s) -> const char * { return s.data(); });
+ std::unique_ptr<CompilerInstance> CI =
+ init_convenience::BuildCompilerInstance(ClangArgv);
+ auto ST = llvm::make_unique<SelectorTable>();
+ auto BC = llvm::make_unique<Builtin::Context>();
+ std::unique_ptr<ASTContext> AST =
+ init_convenience::BuildASTContext(*CI, *ST, *BC);
+ CI->setASTContext(AST.release());
+ AddExternalSource(*CI, Imports);
+
+ auto LLVMCtx = llvm::make_unique<llvm::LLVMContext>();
+ std::unique_ptr<CodeGenerator> CG =
+ init_convenience::BuildCodeGen(*CI, *LLVMCtx);
+ CG->Initialize(CI->getASTContext());
+
+ CI->getDiagnosticClient().BeginSourceFile(CI->getLangOpts(),
+ &CI->getPreprocessor());
+ if (llvm::Error PE = ParseSource(Path, *CI, *CG)) {
+ return std::move(PE);
+ }
+ CI->getDiagnosticClient().EndSourceFile();
+ if (CI->getDiagnosticClient().getNumErrors()) {
+ return llvm::make_error<llvm::StringError>(
+ "Errors occured while parsing the expression.", std::error_code());
+ } else {
+ return std::move(CI);
+ }
+}
+} // end namespace
+
+int main(int argc, const char **argv) {
+ const bool DisableCrashReporting = true;
+ llvm::sys::PrintStackTraceOnErrorSignal(argv[0], DisableCrashReporting);
+ llvm::cl::ParseCommandLineOptions(argc, argv);
+ std::vector<std::unique_ptr<CompilerInstance>> ImportCIs;
+ for (auto I : Imports) {
+ llvm::Expected<std::unique_ptr<CompilerInstance>> ImportCI = Parse(I, {});
+ if (auto E = ImportCI.takeError()) {
+ llvm::errs() << llvm::toString(std::move(E));
+ exit(-1);
+ } else {
+ ImportCIs.push_back(std::move(*ImportCI));
+ }
+ }
+ llvm::Expected<std::unique_ptr<CompilerInstance>> ExpressionCI =
+ Parse(Expression, ImportCIs);
+ if (auto E = ExpressionCI.takeError()) {
+ llvm::errs() << llvm::toString(std::move(E));
+ exit(-1);
+ } else {
+ return 0;
+ }
+}
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