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llvm-for-llvmta/tools/clang/lib/CrossTU/CrossTranslationUnit.cpp

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2022-04-25 13:02:35 +02:00
//===--- CrossTranslationUnit.cpp - -----------------------------*- C++ -*-===//
//
// 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 implements the CrossTranslationUnit interface.
//
//===----------------------------------------------------------------------===//
#include "clang/CrossTU/CrossTranslationUnit.h"
#include "clang/AST/ASTImporter.h"
#include "clang/AST/Decl.h"
#include "clang/AST/ParentMapContext.h"
#include "clang/Basic/TargetInfo.h"
#include "clang/CrossTU/CrossTUDiagnostic.h"
#include "clang/Frontend/ASTUnit.h"
#include "clang/Frontend/CompilerInstance.h"
#include "clang/Frontend/TextDiagnosticPrinter.h"
#include "clang/Index/USRGeneration.h"
#include "llvm/ADT/Optional.h"
#include "llvm/ADT/Statistic.h"
#include "llvm/ADT/Triple.h"
#include "llvm/Option/ArgList.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/ManagedStatic.h"
#include "llvm/Support/Path.h"
#include "llvm/Support/YAMLParser.h"
#include "llvm/Support/raw_ostream.h"
#include <algorithm>
#include <fstream>
#include <sstream>
#include <tuple>
namespace clang {
namespace cross_tu {
namespace {
#define DEBUG_TYPE "CrossTranslationUnit"
STATISTIC(NumGetCTUCalled, "The # of getCTUDefinition function called");
STATISTIC(
NumNotInOtherTU,
"The # of getCTUDefinition called but the function is not in any other TU");
STATISTIC(NumGetCTUSuccess,
"The # of getCTUDefinition successfully returned the "
"requested function's body");
STATISTIC(NumUnsupportedNodeFound, "The # of imports when the ASTImporter "
"encountered an unsupported AST Node");
STATISTIC(NumNameConflicts, "The # of imports when the ASTImporter "
"encountered an ODR error");
STATISTIC(NumTripleMismatch, "The # of triple mismatches");
STATISTIC(NumLangMismatch, "The # of language mismatches");
STATISTIC(NumLangDialectMismatch, "The # of language dialect mismatches");
STATISTIC(NumASTLoadThresholdReached,
"The # of ASTs not loaded because of threshold");
// Same as Triple's equality operator, but we check a field only if that is
// known in both instances.
bool hasEqualKnownFields(const llvm::Triple &Lhs, const llvm::Triple &Rhs) {
using llvm::Triple;
if (Lhs.getArch() != Triple::UnknownArch &&
Rhs.getArch() != Triple::UnknownArch && Lhs.getArch() != Rhs.getArch())
return false;
if (Lhs.getSubArch() != Triple::NoSubArch &&
Rhs.getSubArch() != Triple::NoSubArch &&
Lhs.getSubArch() != Rhs.getSubArch())
return false;
if (Lhs.getVendor() != Triple::UnknownVendor &&
Rhs.getVendor() != Triple::UnknownVendor &&
Lhs.getVendor() != Rhs.getVendor())
return false;
if (!Lhs.isOSUnknown() && !Rhs.isOSUnknown() &&
Lhs.getOS() != Rhs.getOS())
return false;
if (Lhs.getEnvironment() != Triple::UnknownEnvironment &&
Rhs.getEnvironment() != Triple::UnknownEnvironment &&
Lhs.getEnvironment() != Rhs.getEnvironment())
return false;
if (Lhs.getObjectFormat() != Triple::UnknownObjectFormat &&
Rhs.getObjectFormat() != Triple::UnknownObjectFormat &&
Lhs.getObjectFormat() != Rhs.getObjectFormat())
return false;
return true;
}
// FIXME: This class is will be removed after the transition to llvm::Error.
class IndexErrorCategory : public std::error_category {
public:
const char *name() const noexcept override { return "clang.index"; }
std::string message(int Condition) const override {
switch (static_cast<index_error_code>(Condition)) {
case index_error_code::unspecified:
return "An unknown error has occurred.";
case index_error_code::missing_index_file:
return "The index file is missing.";
case index_error_code::invalid_index_format:
return "Invalid index file format.";
case index_error_code::multiple_definitions:
return "Multiple definitions in the index file.";
case index_error_code::missing_definition:
return "Missing definition from the index file.";
case index_error_code::failed_import:
return "Failed to import the definition.";
case index_error_code::failed_to_get_external_ast:
return "Failed to load external AST source.";
case index_error_code::failed_to_generate_usr:
return "Failed to generate USR.";
case index_error_code::triple_mismatch:
return "Triple mismatch";
case index_error_code::lang_mismatch:
return "Language mismatch";
case index_error_code::lang_dialect_mismatch:
return "Language dialect mismatch";
case index_error_code::load_threshold_reached:
return "Load threshold reached";
case index_error_code::invocation_list_ambiguous:
return "Invocation list file contains multiple references to the same "
"source file.";
case index_error_code::invocation_list_file_not_found:
return "Invocation list file is not found.";
case index_error_code::invocation_list_empty:
return "Invocation list file is empty.";
case index_error_code::invocation_list_wrong_format:
return "Invocation list file is in wrong format.";
case index_error_code::invocation_list_lookup_unsuccessful:
return "Invocation list file does not contain the requested source file.";
}
llvm_unreachable("Unrecognized index_error_code.");
}
};
static llvm::ManagedStatic<IndexErrorCategory> Category;
} // end anonymous namespace
char IndexError::ID;
void IndexError::log(raw_ostream &OS) const {
OS << Category->message(static_cast<int>(Code)) << '\n';
}
std::error_code IndexError::convertToErrorCode() const {
return std::error_code(static_cast<int>(Code), *Category);
}
llvm::Expected<llvm::StringMap<std::string>>
parseCrossTUIndex(StringRef IndexPath) {
std::ifstream ExternalMapFile{std::string(IndexPath)};
if (!ExternalMapFile)
return llvm::make_error<IndexError>(index_error_code::missing_index_file,
IndexPath.str());
llvm::StringMap<std::string> Result;
std::string Line;
unsigned LineNo = 1;
while (std::getline(ExternalMapFile, Line)) {
StringRef LineRef{Line};
const size_t Delimiter = LineRef.find(' ');
if (Delimiter > 0 && Delimiter != std::string::npos) {
StringRef LookupName = LineRef.substr(0, Delimiter);
// Store paths with posix-style directory separator.
SmallString<32> FilePath(LineRef.substr(Delimiter + 1));
llvm::sys::path::native(FilePath, llvm::sys::path::Style::posix);
bool InsertionOccured;
std::tie(std::ignore, InsertionOccured) =
Result.try_emplace(LookupName, FilePath.begin(), FilePath.end());
if (!InsertionOccured)
return llvm::make_error<IndexError>(
index_error_code::multiple_definitions, IndexPath.str(), LineNo);
} else
return llvm::make_error<IndexError>(
index_error_code::invalid_index_format, IndexPath.str(), LineNo);
++LineNo;
}
return Result;
}
std::string
createCrossTUIndexString(const llvm::StringMap<std::string> &Index) {
std::ostringstream Result;
for (const auto &E : Index)
Result << E.getKey().str() << " " << E.getValue() << '\n';
return Result.str();
}
bool containsConst(const VarDecl *VD, const ASTContext &ACtx) {
CanQualType CT = ACtx.getCanonicalType(VD->getType());
if (!CT.isConstQualified()) {
const RecordType *RTy = CT->getAs<RecordType>();
if (!RTy || !RTy->hasConstFields())
return false;
}
return true;
}
static bool hasBodyOrInit(const FunctionDecl *D, const FunctionDecl *&DefD) {
return D->hasBody(DefD);
}
static bool hasBodyOrInit(const VarDecl *D, const VarDecl *&DefD) {
return D->getAnyInitializer(DefD);
}
template <typename T> static bool hasBodyOrInit(const T *D) {
const T *Unused;
return hasBodyOrInit(D, Unused);
}
CrossTranslationUnitContext::CrossTranslationUnitContext(CompilerInstance &CI)
: Context(CI.getASTContext()), ASTStorage(CI) {}
CrossTranslationUnitContext::~CrossTranslationUnitContext() {}
llvm::Optional<std::string>
CrossTranslationUnitContext::getLookupName(const NamedDecl *ND) {
SmallString<128> DeclUSR;
bool Ret = index::generateUSRForDecl(ND, DeclUSR);
if (Ret)
return {};
return std::string(DeclUSR.str());
}
/// Recursively visits the decls of a DeclContext, and returns one with the
/// given USR.
template <typename T>
const T *
CrossTranslationUnitContext::findDefInDeclContext(const DeclContext *DC,
StringRef LookupName) {
assert(DC && "Declaration Context must not be null");
for (const Decl *D : DC->decls()) {
const auto *SubDC = dyn_cast<DeclContext>(D);
if (SubDC)
if (const auto *ND = findDefInDeclContext<T>(SubDC, LookupName))
return ND;
const auto *ND = dyn_cast<T>(D);
const T *ResultDecl;
if (!ND || !hasBodyOrInit(ND, ResultDecl))
continue;
llvm::Optional<std::string> ResultLookupName = getLookupName(ResultDecl);
if (!ResultLookupName || *ResultLookupName != LookupName)
continue;
return ResultDecl;
}
return nullptr;
}
template <typename T>
llvm::Expected<const T *> CrossTranslationUnitContext::getCrossTUDefinitionImpl(
const T *D, StringRef CrossTUDir, StringRef IndexName,
bool DisplayCTUProgress) {
assert(D && "D is missing, bad call to this function!");
assert(!hasBodyOrInit(D) &&
"D has a body or init in current translation unit!");
++NumGetCTUCalled;
const llvm::Optional<std::string> LookupName = getLookupName(D);
if (!LookupName)
return llvm::make_error<IndexError>(
index_error_code::failed_to_generate_usr);
llvm::Expected<ASTUnit *> ASTUnitOrError =
loadExternalAST(*LookupName, CrossTUDir, IndexName, DisplayCTUProgress);
if (!ASTUnitOrError)
return ASTUnitOrError.takeError();
ASTUnit *Unit = *ASTUnitOrError;
assert(&Unit->getFileManager() ==
&Unit->getASTContext().getSourceManager().getFileManager());
const llvm::Triple &TripleTo = Context.getTargetInfo().getTriple();
const llvm::Triple &TripleFrom =
Unit->getASTContext().getTargetInfo().getTriple();
// The imported AST had been generated for a different target.
// Some parts of the triple in the loaded ASTContext can be unknown while the
// very same parts in the target ASTContext are known. Thus we check for the
// known parts only.
if (!hasEqualKnownFields(TripleTo, TripleFrom)) {
// TODO: Pass the SourceLocation of the CallExpression for more precise
// diagnostics.
++NumTripleMismatch;
return llvm::make_error<IndexError>(index_error_code::triple_mismatch,
std::string(Unit->getMainFileName()),
TripleTo.str(), TripleFrom.str());
}
const auto &LangTo = Context.getLangOpts();
const auto &LangFrom = Unit->getASTContext().getLangOpts();
// FIXME: Currenty we do not support CTU across C++ and C and across
// different dialects of C++.
if (LangTo.CPlusPlus != LangFrom.CPlusPlus) {
++NumLangMismatch;
return llvm::make_error<IndexError>(index_error_code::lang_mismatch);
}
// If CPP dialects are different then return with error.
//
// Consider this STL code:
// template<typename _Alloc>
// struct __alloc_traits
// #if __cplusplus >= 201103L
// : std::allocator_traits<_Alloc>
// #endif
// { // ...
// };
// This class template would create ODR errors during merging the two units,
// since in one translation unit the class template has a base class, however
// in the other unit it has none.
if (LangTo.CPlusPlus11 != LangFrom.CPlusPlus11 ||
LangTo.CPlusPlus14 != LangFrom.CPlusPlus14 ||
LangTo.CPlusPlus17 != LangFrom.CPlusPlus17 ||
LangTo.CPlusPlus20 != LangFrom.CPlusPlus20) {
++NumLangDialectMismatch;
return llvm::make_error<IndexError>(
index_error_code::lang_dialect_mismatch);
}
TranslationUnitDecl *TU = Unit->getASTContext().getTranslationUnitDecl();
if (const T *ResultDecl = findDefInDeclContext<T>(TU, *LookupName))
return importDefinition(ResultDecl, Unit);
return llvm::make_error<IndexError>(index_error_code::failed_import);
}
llvm::Expected<const FunctionDecl *>
CrossTranslationUnitContext::getCrossTUDefinition(const FunctionDecl *FD,
StringRef CrossTUDir,
StringRef IndexName,
bool DisplayCTUProgress) {
return getCrossTUDefinitionImpl(FD, CrossTUDir, IndexName,
DisplayCTUProgress);
}
llvm::Expected<const VarDecl *>
CrossTranslationUnitContext::getCrossTUDefinition(const VarDecl *VD,
StringRef CrossTUDir,
StringRef IndexName,
bool DisplayCTUProgress) {
return getCrossTUDefinitionImpl(VD, CrossTUDir, IndexName,
DisplayCTUProgress);
}
void CrossTranslationUnitContext::emitCrossTUDiagnostics(const IndexError &IE) {
switch (IE.getCode()) {
case index_error_code::missing_index_file:
Context.getDiagnostics().Report(diag::err_ctu_error_opening)
<< IE.getFileName();
break;
case index_error_code::invalid_index_format:
Context.getDiagnostics().Report(diag::err_extdefmap_parsing)
<< IE.getFileName() << IE.getLineNum();
break;
case index_error_code::multiple_definitions:
Context.getDiagnostics().Report(diag::err_multiple_def_index)
<< IE.getLineNum();
break;
case index_error_code::triple_mismatch:
Context.getDiagnostics().Report(diag::warn_ctu_incompat_triple)
<< IE.getFileName() << IE.getTripleToName() << IE.getTripleFromName();
break;
default:
break;
}
}
CrossTranslationUnitContext::ASTUnitStorage::ASTUnitStorage(
CompilerInstance &CI)
: Loader(CI, CI.getAnalyzerOpts()->CTUDir,
CI.getAnalyzerOpts()->CTUInvocationList),
LoadGuard(CI.getASTContext().getLangOpts().CPlusPlus
? CI.getAnalyzerOpts()->CTUImportCppThreshold
: CI.getAnalyzerOpts()->CTUImportThreshold) {}
llvm::Expected<ASTUnit *>
CrossTranslationUnitContext::ASTUnitStorage::getASTUnitForFile(
StringRef FileName, bool DisplayCTUProgress) {
// Try the cache first.
auto ASTCacheEntry = FileASTUnitMap.find(FileName);
if (ASTCacheEntry == FileASTUnitMap.end()) {
// Do not load if the limit is reached.
if (!LoadGuard) {
++NumASTLoadThresholdReached;
return llvm::make_error<IndexError>(
index_error_code::load_threshold_reached);
}
auto LoadAttempt = Loader.load(FileName);
if (!LoadAttempt)
return LoadAttempt.takeError();
std::unique_ptr<ASTUnit> LoadedUnit = std::move(LoadAttempt.get());
// Need the raw pointer and the unique_ptr as well.
ASTUnit *Unit = LoadedUnit.get();
// Update the cache.
FileASTUnitMap[FileName] = std::move(LoadedUnit);
LoadGuard.indicateLoadSuccess();
if (DisplayCTUProgress)
llvm::errs() << "CTU loaded AST file: " << FileName << "\n";
return Unit;
} else {
// Found in the cache.
return ASTCacheEntry->second.get();
}
}
llvm::Expected<ASTUnit *>
CrossTranslationUnitContext::ASTUnitStorage::getASTUnitForFunction(
StringRef FunctionName, StringRef CrossTUDir, StringRef IndexName,
bool DisplayCTUProgress) {
// Try the cache first.
auto ASTCacheEntry = NameASTUnitMap.find(FunctionName);
if (ASTCacheEntry == NameASTUnitMap.end()) {
// Load the ASTUnit from the pre-dumped AST file specified by ASTFileName.
// Ensure that the Index is loaded, as we need to search in it.
if (llvm::Error IndexLoadError =
ensureCTUIndexLoaded(CrossTUDir, IndexName))
return std::move(IndexLoadError);
// Check if there is and entry in the index for the function.
if (!NameFileMap.count(FunctionName)) {
++NumNotInOtherTU;
return llvm::make_error<IndexError>(index_error_code::missing_definition);
}
// Search in the index for the filename where the definition of FuncitonName
// resides.
if (llvm::Expected<ASTUnit *> FoundForFile =
getASTUnitForFile(NameFileMap[FunctionName], DisplayCTUProgress)) {
// Update the cache.
NameASTUnitMap[FunctionName] = *FoundForFile;
return *FoundForFile;
} else {
return FoundForFile.takeError();
}
} else {
// Found in the cache.
return ASTCacheEntry->second;
}
}
llvm::Expected<std::string>
CrossTranslationUnitContext::ASTUnitStorage::getFileForFunction(
StringRef FunctionName, StringRef CrossTUDir, StringRef IndexName) {
if (llvm::Error IndexLoadError = ensureCTUIndexLoaded(CrossTUDir, IndexName))
return std::move(IndexLoadError);
return NameFileMap[FunctionName];
}
llvm::Error CrossTranslationUnitContext::ASTUnitStorage::ensureCTUIndexLoaded(
StringRef CrossTUDir, StringRef IndexName) {
// Dont initialize if the map is filled.
if (!NameFileMap.empty())
return llvm::Error::success();
// Get the absolute path to the index file.
SmallString<256> IndexFile = CrossTUDir;
if (llvm::sys::path::is_absolute(IndexName))
IndexFile = IndexName;
else
llvm::sys::path::append(IndexFile, IndexName);
if (auto IndexMapping = parseCrossTUIndex(IndexFile)) {
// Initialize member map.
NameFileMap = *IndexMapping;
return llvm::Error::success();
} else {
// Error while parsing CrossTU index file.
return IndexMapping.takeError();
};
}
llvm::Expected<ASTUnit *> CrossTranslationUnitContext::loadExternalAST(
StringRef LookupName, StringRef CrossTUDir, StringRef IndexName,
bool DisplayCTUProgress) {
// FIXME: The current implementation only supports loading decls with
// a lookup name from a single translation unit. If multiple
// translation units contains decls with the same lookup name an
// error will be returned.
// Try to get the value from the heavily cached storage.
llvm::Expected<ASTUnit *> Unit = ASTStorage.getASTUnitForFunction(
LookupName, CrossTUDir, IndexName, DisplayCTUProgress);
if (!Unit)
return Unit.takeError();
// Check whether the backing pointer of the Expected is a nullptr.
if (!*Unit)
return llvm::make_error<IndexError>(
index_error_code::failed_to_get_external_ast);
return Unit;
}
CrossTranslationUnitContext::ASTLoader::ASTLoader(
CompilerInstance &CI, StringRef CTUDir, StringRef InvocationListFilePath)
: CI(CI), CTUDir(CTUDir), InvocationListFilePath(InvocationListFilePath) {}
CrossTranslationUnitContext::LoadResultTy
CrossTranslationUnitContext::ASTLoader::load(StringRef Identifier) {
llvm::SmallString<256> Path;
if (llvm::sys::path::is_absolute(Identifier, PathStyle)) {
Path = Identifier;
} else {
Path = CTUDir;
llvm::sys::path::append(Path, PathStyle, Identifier);
}
// The path is stored in the InvocationList member in posix style. To
// successfully lookup an entry based on filepath, it must be converted.
llvm::sys::path::native(Path, PathStyle);
// Normalize by removing relative path components.
llvm::sys::path::remove_dots(Path, /*remove_dot_dot*/ true, PathStyle);
if (Path.endswith(".ast"))
return loadFromDump(Path);
else
return loadFromSource(Path);
}
CrossTranslationUnitContext::LoadResultTy
CrossTranslationUnitContext::ASTLoader::loadFromDump(StringRef ASTDumpPath) {
IntrusiveRefCntPtr<DiagnosticOptions> DiagOpts = new DiagnosticOptions();
TextDiagnosticPrinter *DiagClient =
new TextDiagnosticPrinter(llvm::errs(), &*DiagOpts);
IntrusiveRefCntPtr<DiagnosticIDs> DiagID(new DiagnosticIDs());
IntrusiveRefCntPtr<DiagnosticsEngine> Diags(
new DiagnosticsEngine(DiagID, &*DiagOpts, DiagClient));
return ASTUnit::LoadFromASTFile(
std::string(ASTDumpPath.str()),
CI.getPCHContainerOperations()->getRawReader(), ASTUnit::LoadEverything,
Diags, CI.getFileSystemOpts());
}
/// Load the AST from a source-file, which is supposed to be located inside the
/// YAML formatted invocation list file under the filesystem path specified by
/// \p InvocationList. The invocation list should contain absolute paths.
/// \p SourceFilePath is the absolute path of the source file that contains the
/// function definition the analysis is looking for. The Index is built by the
/// \p clang-extdef-mapping tool, which is also supposed to be generating
/// absolute paths.
///
/// Proper diagnostic emission requires absolute paths, so even if a future
/// change introduces the handling of relative paths, this must be taken into
/// consideration.
CrossTranslationUnitContext::LoadResultTy
CrossTranslationUnitContext::ASTLoader::loadFromSource(
StringRef SourceFilePath) {
if (llvm::Error InitError = lazyInitInvocationList())
return std::move(InitError);
assert(InvocationList);
auto Invocation = InvocationList->find(SourceFilePath);
if (Invocation == InvocationList->end())
return llvm::make_error<IndexError>(
index_error_code::invocation_list_lookup_unsuccessful);
const InvocationListTy::mapped_type &InvocationCommand = Invocation->second;
SmallVector<const char *, 32> CommandLineArgs(InvocationCommand.size());
std::transform(InvocationCommand.begin(), InvocationCommand.end(),
CommandLineArgs.begin(),
[](auto &&CmdPart) { return CmdPart.c_str(); });
IntrusiveRefCntPtr<DiagnosticOptions> DiagOpts{&CI.getDiagnosticOpts()};
auto *DiagClient = new ForwardingDiagnosticConsumer{CI.getDiagnosticClient()};
IntrusiveRefCntPtr<DiagnosticIDs> DiagID{
CI.getDiagnostics().getDiagnosticIDs()};
IntrusiveRefCntPtr<DiagnosticsEngine> Diags(
new DiagnosticsEngine{DiagID, &*DiagOpts, DiagClient});
return std::unique_ptr<ASTUnit>(ASTUnit::LoadFromCommandLine(
CommandLineArgs.begin(), (CommandLineArgs.end()),
CI.getPCHContainerOperations(), Diags,
CI.getHeaderSearchOpts().ResourceDir));
}
llvm::Expected<InvocationListTy>
parseInvocationList(StringRef FileContent, llvm::sys::path::Style PathStyle) {
InvocationListTy InvocationList;
/// LLVM YAML parser is used to extract information from invocation list file.
llvm::SourceMgr SM;
llvm::yaml::Stream InvocationFile(FileContent, SM);
/// Only the first document is processed.
llvm::yaml::document_iterator FirstInvocationFile = InvocationFile.begin();
/// There has to be at least one document available.
if (FirstInvocationFile == InvocationFile.end())
return llvm::make_error<IndexError>(
index_error_code::invocation_list_empty);
llvm::yaml::Node *DocumentRoot = FirstInvocationFile->getRoot();
if (!DocumentRoot)
return llvm::make_error<IndexError>(
index_error_code::invocation_list_wrong_format);
/// According to the format specified the document must be a mapping, where
/// the keys are paths to source files, and values are sequences of invocation
/// parts.
auto *Mappings = dyn_cast<llvm::yaml::MappingNode>(DocumentRoot);
if (!Mappings)
return llvm::make_error<IndexError>(
index_error_code::invocation_list_wrong_format);
for (auto &NextMapping : *Mappings) {
/// The keys should be strings, which represent a source-file path.
auto *Key = dyn_cast<llvm::yaml::ScalarNode>(NextMapping.getKey());
if (!Key)
return llvm::make_error<IndexError>(
index_error_code::invocation_list_wrong_format);
SmallString<32> ValueStorage;
StringRef SourcePath = Key->getValue(ValueStorage);
// Store paths with PathStyle directory separator.
SmallString<32> NativeSourcePath(SourcePath);
llvm::sys::path::native(NativeSourcePath, PathStyle);
StringRef InvocationKey(NativeSourcePath);
if (InvocationList.find(InvocationKey) != InvocationList.end())
return llvm::make_error<IndexError>(
index_error_code::invocation_list_ambiguous);
/// The values should be sequences of strings, each representing a part of
/// the invocation.
auto *Args = dyn_cast<llvm::yaml::SequenceNode>(NextMapping.getValue());
if (!Args)
return llvm::make_error<IndexError>(
index_error_code::invocation_list_wrong_format);
for (auto &Arg : *Args) {
auto *CmdString = dyn_cast<llvm::yaml::ScalarNode>(&Arg);
if (!CmdString)
return llvm::make_error<IndexError>(
index_error_code::invocation_list_wrong_format);
/// Every conversion starts with an empty working storage, as it is not
/// clear if this is a requirement of the YAML parser.
ValueStorage.clear();
InvocationList[InvocationKey].emplace_back(
CmdString->getValue(ValueStorage));
}
if (InvocationList[InvocationKey].empty())
return llvm::make_error<IndexError>(
index_error_code::invocation_list_wrong_format);
}
return InvocationList;
}
llvm::Error CrossTranslationUnitContext::ASTLoader::lazyInitInvocationList() {
/// Lazily initialize the invocation list member used for on-demand parsing.
if (InvocationList)
return llvm::Error::success();
llvm::ErrorOr<std::unique_ptr<llvm::MemoryBuffer>> FileContent =
llvm::MemoryBuffer::getFile(InvocationListFilePath);
if (!FileContent)
return llvm::make_error<IndexError>(
index_error_code::invocation_list_file_not_found);
std::unique_ptr<llvm::MemoryBuffer> ContentBuffer = std::move(*FileContent);
assert(ContentBuffer && "If no error was produced after loading, the pointer "
"should not be nullptr.");
llvm::Expected<InvocationListTy> ExpectedInvocationList =
parseInvocationList(ContentBuffer->getBuffer(), PathStyle);
if (!ExpectedInvocationList)
return ExpectedInvocationList.takeError();
InvocationList = *ExpectedInvocationList;
return llvm::Error::success();
}
template <typename T>
llvm::Expected<const T *>
CrossTranslationUnitContext::importDefinitionImpl(const T *D, ASTUnit *Unit) {
assert(hasBodyOrInit(D) && "Decls to be imported should have body or init.");
assert(&D->getASTContext() == &Unit->getASTContext() &&
"ASTContext of Decl and the unit should match.");
ASTImporter &Importer = getOrCreateASTImporter(Unit);
auto ToDeclOrError = Importer.Import(D);
if (!ToDeclOrError) {
handleAllErrors(ToDeclOrError.takeError(),
[&](const ImportError &IE) {
switch (IE.Error) {
case ImportError::NameConflict:
++NumNameConflicts;
break;
case ImportError::UnsupportedConstruct:
++NumUnsupportedNodeFound;
break;
case ImportError::Unknown:
llvm_unreachable("Unknown import error happened.");
break;
}
});
return llvm::make_error<IndexError>(index_error_code::failed_import);
}
auto *ToDecl = cast<T>(*ToDeclOrError);
assert(hasBodyOrInit(ToDecl) && "Imported Decl should have body or init.");
++NumGetCTUSuccess;
// Parent map is invalidated after changing the AST.
ToDecl->getASTContext().getParentMapContext().clear();
return ToDecl;
}
llvm::Expected<const FunctionDecl *>
CrossTranslationUnitContext::importDefinition(const FunctionDecl *FD,
ASTUnit *Unit) {
return importDefinitionImpl(FD, Unit);
}
llvm::Expected<const VarDecl *>
CrossTranslationUnitContext::importDefinition(const VarDecl *VD,
ASTUnit *Unit) {
return importDefinitionImpl(VD, Unit);
}
void CrossTranslationUnitContext::lazyInitImporterSharedSt(
TranslationUnitDecl *ToTU) {
if (!ImporterSharedSt)
ImporterSharedSt = std::make_shared<ASTImporterSharedState>(*ToTU);
}
ASTImporter &
CrossTranslationUnitContext::getOrCreateASTImporter(ASTUnit *Unit) {
ASTContext &From = Unit->getASTContext();
auto I = ASTUnitImporterMap.find(From.getTranslationUnitDecl());
if (I != ASTUnitImporterMap.end())
return *I->second;
lazyInitImporterSharedSt(Context.getTranslationUnitDecl());
ASTImporter *NewImporter = new ASTImporter(
Context, Context.getSourceManager().getFileManager(), From,
From.getSourceManager().getFileManager(), false, ImporterSharedSt);
NewImporter->setFileIDImportHandler([this, Unit](FileID ToID, FileID FromID) {
assert(ImportedFileIDs.find(ToID) == ImportedFileIDs.end() &&
"FileID already imported, should not happen.");
ImportedFileIDs[ToID] = std::make_pair(FromID, Unit);
});
ASTUnitImporterMap[From.getTranslationUnitDecl()].reset(NewImporter);
return *NewImporter;
}
llvm::Optional<std::pair<SourceLocation, ASTUnit *>>
CrossTranslationUnitContext::getImportedFromSourceLocation(
const clang::SourceLocation &ToLoc) const {
const SourceManager &SM = Context.getSourceManager();
auto DecToLoc = SM.getDecomposedLoc(ToLoc);
auto I = ImportedFileIDs.find(DecToLoc.first);
if (I == ImportedFileIDs.end())
return {};
FileID FromID = I->second.first;
clang::ASTUnit *Unit = I->second.second;
SourceLocation FromLoc =
Unit->getSourceManager().getComposedLoc(FromID, DecToLoc.second);
return std::make_pair(FromLoc, Unit);
}
} // namespace cross_tu
} // namespace clang