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//===- unittest/AST/ExternalASTSourceTest.cpp -----------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file contains tests for Clang's ExternalASTSource.
//
//===----------------------------------------------------------------------===//
#include "clang/AST/ASTConsumer.h"
#include "clang/AST/ASTContext.h"
#include "clang/AST/ExternalASTSource.h"
#include "clang/Frontend/CompilerInstance.h"
#include "clang/Frontend/CompilerInvocation.h"
#include "clang/Frontend/FrontendActions.h"
#include "clang/Lex/PreprocessorOptions.h"
#include "gtest/gtest.h"
using namespace clang;
using namespace llvm;
class TestFrontendAction : public ASTFrontendAction {
public:
TestFrontendAction(ExternalASTSource *Source) : Source(Source) {}
private:
void ExecuteAction() override {
getCompilerInstance().getASTContext().setExternalSource(Source);
getCompilerInstance().getASTContext().getTranslationUnitDecl()
->setHasExternalVisibleStorage();
return ASTFrontendAction::ExecuteAction();
}
std::unique_ptr<ASTConsumer> CreateASTConsumer(CompilerInstance &CI,
StringRef InFile) override {
return llvm::make_unique<ASTConsumer>();
}
IntrusiveRefCntPtr<ExternalASTSource> Source;
};
bool testExternalASTSource(ExternalASTSource *Source,
StringRef FileContents) {
CompilerInstance Compiler;
Compiler.createDiagnostics();
auto Invocation = std::make_shared<CompilerInvocation>();
Invocation->getPreprocessorOpts().addRemappedFile(
"test.cc", MemoryBuffer::getMemBuffer(FileContents).release());
const char *Args[] = { "test.cc" };
CompilerInvocation::CreateFromArgs(*Invocation, Args,
Args + array_lengthof(Args),
Compiler.getDiagnostics());
Compiler.setInvocation(std::move(Invocation));
TestFrontendAction Action(Source);
return Compiler.ExecuteAction(Action);
}
// Ensure that a failed name lookup into an external source only occurs once.
TEST(ExternalASTSourceTest, FailedLookupOccursOnce) {
struct TestSource : ExternalASTSource {
TestSource(unsigned &Calls) : Calls(Calls) {}
bool FindExternalVisibleDeclsByName(const DeclContext *,
DeclarationName Name) override {
if (Name.getAsString() == "j")
++Calls;
return false;
}
unsigned &Calls;
};
unsigned Calls = 0;
ASSERT_TRUE(testExternalASTSource(new TestSource(Calls), "int j, k = j;"));
EXPECT_EQ(1u, Calls);
}
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