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[SyntaxTree] Split TreeTest.cpp

Browse Source 
We extract the test infrastructure into `TreeTestBase.h` and split the
tests into `MutationsTest.cpp` and `BuildTreeTest.cpp`
This commit is contained in:
Eduardo Caldas 2020-08-13 10:13:59 +00:00
parent 3bd2513ebd
commit d17437d2bd
4 changed files with 314 additions and 270 deletions
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279
clang/unittests/Tooling/Syntax/TreeTest.cpp → clang/unittests/Tooling/Syntax/BuildTreeTest.cpp
View File

@ -1,217 +1,20 @@
//===- TreeTest.cpp -------------------------------------------------------===//
//===- BuildTreeTest.cpp --------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file tests the syntax tree generation from the ClangAST.
//
//===----------------------------------------------------------------------===//
#include "clang/Tooling/Syntax/Tree.h"
#include "clang/AST/ASTConsumer.h"
#include "clang/AST/Decl.h"
#include "clang/AST/Stmt.h"
#include "clang/Basic/LLVM.h"
#include "clang/Basic/TokenKinds.h"
#include "clang/Frontend/CompilerInstance.h"
#include "clang/Frontend/CompilerInvocation.h"
#include "clang/Frontend/FrontendAction.h"
#include "clang/Frontend/TextDiagnosticPrinter.h"
#include "clang/Lex/PreprocessorOptions.h"
#include "clang/Testing/CommandLineArgs.h"
#include "clang/Testing/TestClangConfig.h"
#include "clang/Tooling/Core/Replacement.h"
#include "clang/Tooling/Syntax/BuildTree.h"
#include "clang/Tooling/Syntax/Mutations.h"
#include "clang/Tooling/Syntax/Nodes.h"
#include "clang/Tooling/Syntax/Tokens.h"
#include "clang/Tooling/Tooling.h"
#include "llvm/ADT/ArrayRef.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/ADT/StringExtras.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/Support/Casting.h"
#include "llvm/Support/Error.h"
#include "llvm/Testing/Support/Annotations.h"
#include "gmock/gmock.h"
#include "gtest/gtest.h"
#include <cstdlib>
#include <memory>
using namespace clang;
#include "TreeTestBase.h"
namespace clang {
namespace syntax {
namespace {
static ArrayRef<syntax::Token> tokens(syntax::Node *N) {
assert(N->isOriginal() && "tokens of modified nodes are not well-defined");
if (auto *L = dyn_cast<syntax::Leaf>(N))
return llvm::makeArrayRef(L->token(), 1);
auto *T = cast<syntax::Tree>(N);
return llvm::makeArrayRef(T->firstLeaf()->token(),
T->lastLeaf()->token() + 1);
}
class SyntaxTreeTest : public ::testing::Test,
public ::testing::WithParamInterface<TestClangConfig> {
protected:
// Build a syntax tree for the code.
syntax::TranslationUnit *buildTree(StringRef Code,
const TestClangConfig &ClangConfig) {
// FIXME: this code is almost the identical to the one in TokensTest. Share
// it.
class BuildSyntaxTree : public ASTConsumer {
public:
BuildSyntaxTree(syntax::TranslationUnit *&Root,
std::unique_ptr<syntax::TokenBuffer> &TB,
std::unique_ptr<syntax::Arena> &Arena,
std::unique_ptr<syntax::TokenCollector> Tokens)
: Root(Root), TB(TB), Arena(Arena), Tokens(std::move(Tokens)) {
assert(this->Tokens);
}
void HandleTranslationUnit(ASTContext &Ctx) override {
TB =
std::make_unique<syntax::TokenBuffer>(std::move(*Tokens).consume());
Tokens = nullptr; // make sure we fail if this gets called twice.
Arena = std::make_unique<syntax::Arena>(Ctx.getSourceManager(),
Ctx.getLangOpts(), *TB);
Root = syntax::buildSyntaxTree(*Arena, *Ctx.getTranslationUnitDecl());
}
private:
syntax::TranslationUnit *&Root;
std::unique_ptr<syntax::TokenBuffer> &TB;
std::unique_ptr<syntax::Arena> &Arena;
std::unique_ptr<syntax::TokenCollector> Tokens;
};
class BuildSyntaxTreeAction : public ASTFrontendAction {
public:
BuildSyntaxTreeAction(syntax::TranslationUnit *&Root,
std::unique_ptr<syntax::TokenBuffer> &TB,
std::unique_ptr<syntax::Arena> &Arena)
: Root(Root), TB(TB), Arena(Arena) {}
std::unique_ptr<ASTConsumer>
CreateASTConsumer(CompilerInstance &CI, StringRef InFile) override {
// We start recording the tokens, ast consumer will take on the result.
auto Tokens =
std::make_unique<syntax::TokenCollector>(CI.getPreprocessor());
return std::make_unique<BuildSyntaxTree>(Root, TB, Arena,
std::move(Tokens));
}
private:
syntax::TranslationUnit *&Root;
std::unique_ptr<syntax::TokenBuffer> &TB;
std::unique_ptr<syntax::Arena> &Arena;
};
constexpr const char *FileName = "./input.cpp";
FS->addFile(FileName, time_t(), llvm::MemoryBuffer::getMemBufferCopy(""));
if (!Diags->getClient())
Diags->setClient(new TextDiagnosticPrinter(llvm::errs(), DiagOpts.get()));
Diags->setSeverityForGroup(diag::Flavor::WarningOrError, "unused-value",
diag::Severity::Ignored, SourceLocation());
// Prepare to run a compiler.
std::vector<std::string> Args = {
"syntax-test",
"-fsyntax-only",
};
llvm::copy(ClangConfig.getCommandLineArgs(), std::back_inserter(Args));
Args.push_back(FileName);
std::vector<const char *> ArgsCStr;
for (const std::string &arg : Args) {
ArgsCStr.push_back(arg.c_str());
}
Invocation = createInvocationFromCommandLine(ArgsCStr, Diags, FS);
assert(Invocation);
Invocation->getFrontendOpts().DisableFree = false;
Invocation->getPreprocessorOpts().addRemappedFile(
FileName, llvm::MemoryBuffer::getMemBufferCopy(Code).release());
CompilerInstance Compiler;
Compiler.setInvocation(Invocation);
Compiler.setDiagnostics(Diags.get());
Compiler.setFileManager(FileMgr.get());
Compiler.setSourceManager(SourceMgr.get());
syntax::TranslationUnit *Root = nullptr;
BuildSyntaxTreeAction Recorder(Root, this->TB, this->Arena);
// Action could not be executed but the frontend didn't identify any errors
// in the code ==> problem in setting up the action.
if (!Compiler.ExecuteAction(Recorder) &&
Diags->getClient()->getNumErrors() == 0) {
ADD_FAILURE() << "failed to run the frontend";
std::abort();
}
return Root;
}
::testing::AssertionResult treeDumpEqual(StringRef Code, StringRef Tree) {
SCOPED_TRACE(llvm::join(GetParam().getCommandLineArgs(), " "));
auto *Root = buildTree(Code, GetParam());
if (Diags->getClient()->getNumErrors() != 0) {
return ::testing::AssertionFailure()
<< "Source file has syntax errors, they were printed to the test "
"log";
}
std::string Actual = std::string(StringRef(Root->dump(*Arena)).trim());
// EXPECT_EQ shows the diff between the two strings if they are different.
EXPECT_EQ(Tree.trim().str(), Actual);
if (Actual != Tree.trim().str()) {
return ::testing::AssertionFailure();
}
return ::testing::AssertionSuccess();
}
// Adds a file to the test VFS.
void addFile(StringRef Path, StringRef Contents) {
if (!FS->addFile(Path, time_t(),
llvm::MemoryBuffer::getMemBufferCopy(Contents))) {
ADD_FAILURE() << "could not add a file to VFS: " << Path;
}
}
/// Finds the deepest node in the tree that covers exactly \p R.
/// FIXME: implement this efficiently and move to public syntax tree API.
syntax::Node *nodeByRange(llvm::Annotations::Range R, syntax::Node *Root) {
ArrayRef<syntax::Token> Toks = tokens(Root);
if (Toks.front().location().isFileID() &&
Toks.back().location().isFileID() &&
syntax::Token::range(*SourceMgr, Toks.front(), Toks.back()) ==
syntax::FileRange(SourceMgr->getMainFileID(), R.Begin, R.End))
return Root;
auto *T = dyn_cast<syntax::Tree>(Root);
if (!T)
return nullptr;
for (auto *C = T->firstChild(); C != nullptr; C = C->nextSibling()) {
if (auto *Result = nodeByRange(R, C))
return Result;
}
return nullptr;
}
// Data fields.
IntrusiveRefCntPtr<DiagnosticOptions> DiagOpts = new DiagnosticOptions();
IntrusiveRefCntPtr<DiagnosticsEngine> Diags =
new DiagnosticsEngine(new DiagnosticIDs, DiagOpts.get());
IntrusiveRefCntPtr<llvm::vfs::InMemoryFileSystem> FS =
new llvm::vfs::InMemoryFileSystem;
IntrusiveRefCntPtr<FileManager> FileMgr =
new FileManager(FileSystemOptions(), FS);
IntrusiveRefCntPtr<SourceManager> SourceMgr =
new SourceManager(*Diags, *FileMgr);
std::shared_ptr<CompilerInvocation> Invocation;
// Set after calling buildTree().
std::unique_ptr<syntax::TokenBuffer> TB;
std::unique_ptr<syntax::Arena> Arena;
};
TEST_P(SyntaxTreeTest, Simple) {
EXPECT_TRUE(treeDumpEqual(
@ -5033,70 +4836,6 @@ void x(char a, short (*b)(int), long (**c)(long long));
)txt"));
}
TEST_P(SyntaxTreeTest, Mutations) {
if (!GetParam().isCXX11OrLater()) {
return;
}
using Transformation = std::function<void(
const llvm::Annotations & /*Input*/, syntax::TranslationUnit * /*Root*/)>;
auto CheckTransformation = [this](std::string Input, std::string Expected,
Transformation Transform) -> void {
llvm::Annotations Source(Input);
auto *Root = buildTree(Source.code(), GetParam());
Transform(Source, Root);
auto Replacements = syntax::computeReplacements(*Arena, *Root);
auto Output = tooling::applyAllReplacements(Source.code(), Replacements);
if (!Output) {
ADD_FAILURE() << "could not apply replacements: "
<< llvm::toString(Output.takeError());
return;
}
EXPECT_EQ(Expected, *Output) << "input is:\n" << Input;
};
// Removes the selected statement. Input should have exactly one selected
// range and it should correspond to a single statement.
auto RemoveStatement = [this](const llvm::Annotations &Input,
syntax::TranslationUnit *TU) {
auto *S = cast<syntax::Statement>(nodeByRange(Input.range(), TU));
ASSERT_TRUE(S->canModify()) << "cannot remove a statement";
syntax::removeStatement(*Arena, S);
EXPECT_TRUE(S->isDetached());
EXPECT_FALSE(S->isOriginal())
<< "node removed from tree cannot be marked as original";
};
std::vector<std::pair<std::string /*Input*/, std::string /*Expected*/>>
Cases = {
{"void test() { [[100+100;]] test(); }", "void test() { test(); }"},
{"void test() { if (true) [[{}]] else {} }",
"void test() { if (true) ; else {} }"},
{"void test() { [[;]] }", "void test() { }"}};
for (const auto &C : Cases)
CheckTransformation(C.first, C.second, RemoveStatement);
}
TEST_P(SyntaxTreeTest, SynthesizedNodes) {
buildTree("", GetParam());
auto *C = syntax::createPunctuation(*Arena, tok::comma);
ASSERT_NE(C, nullptr);
EXPECT_EQ(C->token()->kind(), tok::comma);
EXPECT_TRUE(C->canModify());
EXPECT_FALSE(C->isOriginal());
EXPECT_TRUE(C->isDetached());
auto *S = syntax::createEmptyStatement(*Arena);
ASSERT_NE(S, nullptr);
EXPECT_TRUE(S->canModify());
EXPECT_FALSE(S->isOriginal());
EXPECT_TRUE(S->isDetached());
}
static std::vector<TestClangConfig> allTestClangConfigs() {
std::vector<TestClangConfig> all_configs;
for (TestLanguage lang : {Lang_C89, Lang_C99, Lang_CXX03, Lang_CXX11,
@ -5118,3 +4857,5 @@ INSTANTIATE_TEST_CASE_P(SyntaxTreeTests, SyntaxTreeTest,
testing::ValuesIn(allTestClangConfigs()), );
} // namespace
} // namespace syntax
} // namespace clang

3
clang/unittests/Tooling/Syntax/CMakeLists.txt
View File

@ -3,7 +3,8 @@ set(LLVM_LINK_COMPONENTS
)
add_clang_unittest(SyntaxTests
TreeTest.cpp
BuildTreeTest.cpp
MutationsTest.cpp
TokensTest.cpp
)

84
clang/unittests/Tooling/Syntax/MutationsTest.cpp Normal file
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@ -0,0 +1,84 @@
//===- MutationsTest.cpp --------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file tests mutation API for syntax trees.
//
//===----------------------------------------------------------------------===//
#include "TreeTestBase.h"
namespace clang {
namespace syntax {
namespace {
TEST_P(SyntaxTreeTest, Mutations) {
if (!GetParam().isCXX11OrLater()) {
return;
}
using Transformation = std::function<void(
const llvm::Annotations & /*Input*/, syntax::TranslationUnit * /*Root*/)>;
auto CheckTransformation = [this](std::string Input, std::string Expected,
Transformation Transform) -> void {
llvm::Annotations Source(Input);
auto *Root = buildTree(Source.code(), GetParam());
Transform(Source, Root);
auto Replacements = syntax::computeReplacements(*Arena, *Root);
auto Output = tooling::applyAllReplacements(Source.code(), Replacements);
if (!Output) {
ADD_FAILURE() << "could not apply replacements: "
<< llvm::toString(Output.takeError());
return;
}
EXPECT_EQ(Expected, *Output) << "input is:\n" << Input;
};
// Removes the selected statement. Input should have exactly one selected
// range and it should correspond to a single statement.
auto RemoveStatement = [this](const llvm::Annotations &Input,
syntax::TranslationUnit *TU) {
auto *S = cast<syntax::Statement>(nodeByRange(Input.range(), TU));
ASSERT_TRUE(S->canModify()) << "cannot remove a statement";
syntax::removeStatement(*Arena, S);
EXPECT_TRUE(S->isDetached());
EXPECT_FALSE(S->isOriginal())
<< "node removed from tree cannot be marked as original";
};
std::vector<std::pair<std::string /*Input*/, std::string /*Expected*/>>
Cases = {
{"void test() { [[100+100;]] test(); }", "void test() { test(); }"},
{"void test() { if (true) [[{}]] else {} }",
"void test() { if (true) ; else {} }"},
{"void test() { [[;]] }", "void test() { }"}};
for (const auto &C : Cases)
CheckTransformation(C.first, C.second, RemoveStatement);
}
TEST_P(SyntaxTreeTest, SynthesizedNodes) {
buildTree("", GetParam());
auto *C = syntax::createPunctuation(*Arena, tok::comma);
ASSERT_NE(C, nullptr);
EXPECT_EQ(C->token()->kind(), tok::comma);
EXPECT_TRUE(C->canModify());
EXPECT_FALSE(C->isOriginal());
EXPECT_TRUE(C->isDetached());
auto *S = syntax::createEmptyStatement(*Arena);
ASSERT_NE(S, nullptr);
EXPECT_TRUE(S->canModify());
EXPECT_FALSE(S->isOriginal());
EXPECT_TRUE(S->isDetached());
}
} // namespace
} // namespace syntax
} // namespace clang

218
clang/unittests/Tooling/Syntax/TreeTestBase.h Normal file
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@ -0,0 +1,218 @@
//===- TreeTestBase.cpp ---------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file provides the test infrastructure for syntax trees.
//
//===----------------------------------------------------------------------===//
#include "clang/AST/ASTConsumer.h"
#include "clang/AST/Decl.h"
#include "clang/AST/Stmt.h"
#include "clang/Basic/LLVM.h"
#include "clang/Basic/TokenKinds.h"
#include "clang/Frontend/CompilerInstance.h"
#include "clang/Frontend/CompilerInvocation.h"
#include "clang/Frontend/FrontendAction.h"
#include "clang/Frontend/TextDiagnosticPrinter.h"
#include "clang/Lex/PreprocessorOptions.h"
#include "clang/Testing/CommandLineArgs.h"
#include "clang/Testing/TestClangConfig.h"
#include "clang/Tooling/Core/Replacement.h"
#include "clang/Tooling/Syntax/BuildTree.h"
#include "clang/Tooling/Syntax/Mutations.h"
#include "clang/Tooling/Syntax/Nodes.h"
#include "clang/Tooling/Syntax/Tokens.h"
#include "clang/Tooling/Tooling.h"
#include "llvm/ADT/ArrayRef.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/ADT/StringExtras.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/Support/Casting.h"
#include "llvm/Support/Error.h"
#include "llvm/Testing/Support/Annotations.h"
#include "gmock/gmock.h"
#include "gtest/gtest.h"
#include <cstdlib>
#include <memory>
namespace clang {
namespace syntax {
static ArrayRef<syntax::Token> tokens(syntax::Node *N) {
assert(N->isOriginal() && "tokens of modified nodes are not well-defined");
if (auto *L = dyn_cast<syntax::Leaf>(N))
return llvm::makeArrayRef(L->token(), 1);
auto *T = cast<syntax::Tree>(N);
return llvm::makeArrayRef(T->firstLeaf()->token(),
T->lastLeaf()->token() + 1);
}
class SyntaxTreeTest : public ::testing::Test,
public ::testing::WithParamInterface<TestClangConfig> {
protected:
// Build a syntax tree for the code.
syntax::TranslationUnit *buildTree(StringRef Code,
const TestClangConfig &ClangConfig) {
// FIXME: this code is almost the identical to the one in TokensTest. Share
// it.
class BuildSyntaxTree : public ASTConsumer {
public:
BuildSyntaxTree(syntax::TranslationUnit *&Root,
std::unique_ptr<syntax::TokenBuffer> &TB,
std::unique_ptr<syntax::Arena> &Arena,
std::unique_ptr<syntax::TokenCollector> Tokens)
: Root(Root), TB(TB), Arena(Arena), Tokens(std::move(Tokens)) {
assert(this->Tokens);
}
void HandleTranslationUnit(ASTContext &Ctx) override {
TB =
std::make_unique<syntax::TokenBuffer>(std::move(*Tokens).consume());
Tokens = nullptr; // make sure we fail if this gets called twice.
Arena = std::make_unique<syntax::Arena>(Ctx.getSourceManager(),
Ctx.getLangOpts(), *TB);
Root = syntax::buildSyntaxTree(*Arena, *Ctx.getTranslationUnitDecl());
}
private:
syntax::TranslationUnit *&Root;
std::unique_ptr<syntax::TokenBuffer> &TB;
std::unique_ptr<syntax::Arena> &Arena;
std::unique_ptr<syntax::TokenCollector> Tokens;
};
class BuildSyntaxTreeAction : public ASTFrontendAction {
public:
BuildSyntaxTreeAction(syntax::TranslationUnit *&Root,
std::unique_ptr<syntax::TokenBuffer> &TB,
std::unique_ptr<syntax::Arena> &Arena)
: Root(Root), TB(TB), Arena(Arena) {}
std::unique_ptr<ASTConsumer>
CreateASTConsumer(CompilerInstance &CI, StringRef InFile) override {
// We start recording the tokens, ast consumer will take on the result.
auto Tokens =
std::make_unique<syntax::TokenCollector>(CI.getPreprocessor());
return std::make_unique<BuildSyntaxTree>(Root, TB, Arena,
std::move(Tokens));
}
private:
syntax::TranslationUnit *&Root;
std::unique_ptr<syntax::TokenBuffer> &TB;
std::unique_ptr<syntax::Arena> &Arena;
};
constexpr const char *FileName = "./input.cpp";
FS->addFile(FileName, time_t(), llvm::MemoryBuffer::getMemBufferCopy(""));
if (!Diags->getClient())
Diags->setClient(new TextDiagnosticPrinter(llvm::errs(), DiagOpts.get()));
Diags->setSeverityForGroup(diag::Flavor::WarningOrError, "unused-value",
diag::Severity::Ignored, SourceLocation());
// Prepare to run a compiler.
std::vector<std::string> Args = {
"syntax-test",
"-fsyntax-only",
};
llvm::copy(ClangConfig.getCommandLineArgs(), std::back_inserter(Args));
Args.push_back(FileName);
std::vector<const char *> ArgsCStr;
for (const std::string &arg : Args) {
ArgsCStr.push_back(arg.c_str());
}
Invocation = createInvocationFromCommandLine(ArgsCStr, Diags, FS);
assert(Invocation);
Invocation->getFrontendOpts().DisableFree = false;
Invocation->getPreprocessorOpts().addRemappedFile(
FileName, llvm::MemoryBuffer::getMemBufferCopy(Code).release());
CompilerInstance Compiler;
Compiler.setInvocation(Invocation);
Compiler.setDiagnostics(Diags.get());
Compiler.setFileManager(FileMgr.get());
Compiler.setSourceManager(SourceMgr.get());
syntax::TranslationUnit *Root = nullptr;
BuildSyntaxTreeAction Recorder(Root, this->TB, this->Arena);
// Action could not be executed but the frontend didn't identify any errors
// in the code ==> problem in setting up the action.
if (!Compiler.ExecuteAction(Recorder) &&
Diags->getClient()->getNumErrors() == 0) {
ADD_FAILURE() << "failed to run the frontend";
std::abort();
}
return Root;
}
::testing::AssertionResult treeDumpEqual(StringRef Code, StringRef Tree) {
SCOPED_TRACE(llvm::join(GetParam().getCommandLineArgs(), " "));
auto *Root = buildTree(Code, GetParam());
if (Diags->getClient()->getNumErrors() != 0) {
return ::testing::AssertionFailure()
<< "Source file has syntax errors, they were printed to the test "
"log";
}
std::string Actual = std::string(StringRef(Root->dump(*Arena)).trim());
// EXPECT_EQ shows the diff between the two strings if they are different.
EXPECT_EQ(Tree.trim().str(), Actual);
if (Actual != Tree.trim().str()) {
return ::testing::AssertionFailure();
}
return ::testing::AssertionSuccess();
}
// Adds a file to the test VFS.
void addFile(StringRef Path, StringRef Contents) {
if (!FS->addFile(Path, time_t(),
llvm::MemoryBuffer::getMemBufferCopy(Contents))) {
ADD_FAILURE() << "could not add a file to VFS: " << Path;
}
}
/// Finds the deepest node in the tree that covers exactly \p R.
/// FIXME: implement this efficiently and move to public syntax tree API.
syntax::Node *nodeByRange(llvm::Annotations::Range R, syntax::Node *Root) {
ArrayRef<syntax::Token> Toks = tokens(Root);
if (Toks.front().location().isFileID() &&
Toks.back().location().isFileID() &&
syntax::Token::range(*SourceMgr, Toks.front(), Toks.back()) ==
syntax::FileRange(SourceMgr->getMainFileID(), R.Begin, R.End))
return Root;
auto *T = dyn_cast<syntax::Tree>(Root);
if (!T)
return nullptr;
for (auto *C = T->firstChild(); C != nullptr; C = C->nextSibling()) {
if (auto *Result = nodeByRange(R, C))
return Result;
}
return nullptr;
}
// Data fields.
IntrusiveRefCntPtr<DiagnosticOptions> DiagOpts = new DiagnosticOptions();
IntrusiveRefCntPtr<DiagnosticsEngine> Diags =
new DiagnosticsEngine(new DiagnosticIDs, DiagOpts.get());
IntrusiveRefCntPtr<llvm::vfs::InMemoryFileSystem> FS =
new llvm::vfs::InMemoryFileSystem;
IntrusiveRefCntPtr<FileManager> FileMgr =
new FileManager(FileSystemOptions(), FS);
IntrusiveRefCntPtr<SourceManager> SourceMgr =
new SourceManager(*Diags, *FileMgr);
std::shared_ptr<CompilerInvocation> Invocation;
// Set after calling buildTree().
std::unique_ptr<syntax::TokenBuffer> TB;
std::unique_ptr<syntax::Arena> Arena;
};
} // namespace syntax
} // namespace clang