| 1 | //===- unittest/AST/ExternalASTSourceTest.cpp -----------------------------===// |
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| 2 | // |
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| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
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| 4 | // See https://llvm.org/LICENSE.txt for license information. |
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| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
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| 6 | // |
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| 7 | //===----------------------------------------------------------------------===// |
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| 8 | // |
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| 9 | // This file contains tests for Clang's ExternalASTSource. |
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| 10 | // |
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| 11 | //===----------------------------------------------------------------------===// |
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| 12 | |
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| 13 | #include "clang/AST/ExternalASTSource.h" |
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| 14 | #include "clang/AST/ASTConsumer.h" |
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| 15 | #include "clang/AST/ASTContext.h" |
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| 16 | #include "clang/Frontend/CompilerInstance.h" |
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| 17 | #include "clang/Frontend/CompilerInvocation.h" |
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| 18 | #include "clang/Frontend/FrontendActions.h" |
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| 19 | #include "clang/Lex/PreprocessorOptions.h" |
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| 20 | #include "llvm/Support/VirtualFileSystem.h" |
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| 21 | #include "gtest/gtest.h" |
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| 22 | |
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| 23 | using namespace clang; |
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| 24 | using namespace llvm; |
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| 25 | |
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| 26 | |
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| 27 | class TestFrontendAction : public ASTFrontendAction { |
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| 28 | public: |
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| 29 | TestFrontendAction(ExternalASTSource *Source) : Source(Source) {} |
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| 30 | |
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| 31 | private: |
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| 32 | void ExecuteAction() override { |
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| 33 | getCompilerInstance().getASTContext().setExternalSource(Source); |
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| 34 | getCompilerInstance().getASTContext().getTranslationUnitDecl() |
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| 35 | ->setHasExternalVisibleStorage(); |
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| 36 | return ASTFrontendAction::ExecuteAction(); |
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| 37 | } |
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| 38 | |
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| 39 | std::unique_ptr<ASTConsumer> CreateASTConsumer(CompilerInstance &CI, |
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| 40 | StringRef InFile) override { |
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| 41 | return std::make_unique<ASTConsumer>(); |
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| 42 | } |
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| 43 | |
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| 44 | IntrusiveRefCntPtr<ExternalASTSource> Source; |
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| 45 | }; |
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| 46 | |
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| 47 | bool testExternalASTSource(ExternalASTSource *Source, StringRef FileContents) { |
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| 48 | |
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| 49 | auto Invocation = std::make_shared<CompilerInvocation>(); |
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| 50 | Invocation->getPreprocessorOpts().addRemappedFile( |
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| 51 | From: "test.cc" , To: MemoryBuffer::getMemBuffer(InputData: FileContents).release()); |
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| 52 | const char *Args[] = { "test.cc" }; |
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| 53 | |
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| 54 | DiagnosticOptions InvocationDiagOpts; |
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| 55 | auto InvocationDiags = CompilerInstance::createDiagnostics( |
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| 56 | VFS&: *llvm::vfs::getRealFileSystem(), Opts&: InvocationDiagOpts); |
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| 57 | CompilerInvocation::CreateFromArgs(Res&: *Invocation, CommandLineArgs: Args, Diags&: *InvocationDiags); |
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| 58 | |
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| 59 | CompilerInstance Compiler(std::move(Invocation)); |
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| 60 | Compiler.createDiagnostics(VFS&: *llvm::vfs::getRealFileSystem()); |
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| 61 | |
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| 62 | TestFrontendAction Action(Source); |
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| 63 | return Compiler.ExecuteAction(Act&: Action); |
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| 64 | } |
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| 65 | |
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| 66 | // Ensure that a failed name lookup into an external source only occurs once. |
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| 67 | TEST(ExternalASTSourceTest, FailedLookupOccursOnce) { |
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| 68 | struct TestSource : ExternalASTSource { |
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| 69 | TestSource(unsigned &Calls) : Calls(Calls) {} |
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| 70 | |
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| 71 | bool |
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| 72 | FindExternalVisibleDeclsByName(const DeclContext *, DeclarationName Name, |
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| 73 | const DeclContext *OriginalDC) override { |
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| 74 | if (Name.getAsString() == "j" ) |
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| 75 | ++Calls; |
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| 76 | return false; |
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| 77 | } |
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| 78 | |
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| 79 | unsigned &Calls; |
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| 80 | }; |
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| 81 | |
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| 82 | unsigned Calls = 0; |
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| 83 | ASSERT_TRUE(testExternalASTSource(new TestSource(Calls), "int j, k = j;" )); |
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| 84 | EXPECT_EQ(1u, Calls); |
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| 85 | } |
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| 86 | |
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