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//===--- 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/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/Triple.h"
#include "llvm/ADT/Statistic.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/ManagedStatic.h"
#include "llvm/Support/Path.h"
#include "llvm/Support/raw_ostream.h"
#include <fstream>
#include <sstream>
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(NumTripleMismatch, "The # of triple mismatches");
STATISTIC(NumLangMismatch, "The # of language mismatches");
STATISTIC(NumLangDialectMismatch, "The # of language dialect mismatches");
// 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";
}
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, StringRef CrossTUDir) {
std::ifstream ExternalMapFile(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)) {
const size_t Pos = Line.find(" ");
if (Pos > 0 && Pos != std::string::npos) {
StringRef LineRef{Line};
StringRef LookupName = LineRef.substr(0, Pos);
if (Result.count(LookupName))
return llvm::make_error<IndexError>(
index_error_code::multiple_definitions, IndexPath.str(), LineNo);
StringRef FileName = LineRef.substr(Pos + 1);
SmallString<256> FilePath = CrossTUDir;
llvm::sys::path::append(FilePath, FileName);
Result[LookupName] = FilePath.str().str();
} 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)
: CI(CI), Context(CI.getASTContext()) {}
CrossTranslationUnitContext::~CrossTranslationUnitContext() {}
std::string CrossTranslationUnitContext::getLookupName(const NamedDecl *ND) {
SmallString<128> DeclUSR;
bool Ret = index::generateUSRForDecl(ND, DeclUSR);
(void)Ret;
assert(!Ret && "Unable to generate USR");
return 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;
if (getLookupName(ResultDecl) != 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 std::string LookupName = getLookupName(D);
if (LookupName.empty())
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,
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.CPlusPlus2a != LangFrom.CPlusPlus2a) {
++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);
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;
}
}
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.
ASTUnit *Unit = nullptr;
auto NameUnitCacheEntry = NameASTUnitMap.find(LookupName);
if (NameUnitCacheEntry == NameASTUnitMap.end()) {
if (NameFileMap.empty()) {
SmallString<256> IndexFile = CrossTUDir;
if (llvm::sys::path::is_absolute(IndexName))
IndexFile = IndexName;
else
llvm::sys::path::append(IndexFile, IndexName);
llvm::Expected<llvm::StringMap<std::string>> IndexOrErr =
parseCrossTUIndex(IndexFile, CrossTUDir);
if (IndexOrErr)
NameFileMap = *IndexOrErr;
else
return IndexOrErr.takeError();
}
auto It = NameFileMap.find(LookupName);
if (It == NameFileMap.end()) {
++NumNotInOtherTU;
return llvm::make_error<IndexError>(index_error_code::missing_definition);
}
StringRef ASTFileName = It->second;
auto ASTCacheEntry = FileASTUnitMap.find(ASTFileName);
if (ASTCacheEntry == FileASTUnitMap.end()) {
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));
std::unique_ptr<ASTUnit> LoadedUnit(ASTUnit::LoadFromASTFile(
ASTFileName, CI.getPCHContainerOperations()->getRawReader(),
ASTUnit::LoadEverything, Diags, CI.getFileSystemOpts()));
Unit = LoadedUnit.get();
FileASTUnitMap[ASTFileName] = std::move(LoadedUnit);
if (DisplayCTUProgress) {
llvm::errs() << "CTU loaded AST file: "
<< ASTFileName << "\n";
}
} else {
Unit = ASTCacheEntry->second.get();
}
NameASTUnitMap[LookupName] = Unit;
} else {
Unit = NameUnitCacheEntry->second;
}
if (!Unit)
return llvm::make_error<IndexError>(
index_error_code::failed_to_get_external_ast);
return Unit;
}
template <typename T>
llvm::Expected<const T *>
CrossTranslationUnitContext::importDefinitionImpl(const T *D) {
assert(hasBodyOrInit(D) && "Decls to be imported should have body or init.");
ASTImporter &Importer = getOrCreateASTImporter(D->getASTContext());
auto ToDeclOrError = Importer.Import(D);
if (!ToDeclOrError) {
handleAllErrors(ToDeclOrError.takeError(),
[&](const ImportError &IE) {
switch (IE.Error) {
case ImportError::NameConflict:
// FIXME: Add statistic.
break;
case ImportError::UnsupportedConstruct:
// FIXME: Add statistic.
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;
return ToDecl;
}
llvm::Expected<const FunctionDecl *>
CrossTranslationUnitContext::importDefinition(const FunctionDecl *FD) {
return importDefinitionImpl(FD);
}
llvm::Expected<const VarDecl *>
CrossTranslationUnitContext::importDefinition(const VarDecl *VD) {
return importDefinitionImpl(VD);
}
void CrossTranslationUnitContext::lazyInitLookupTable(
TranslationUnitDecl *ToTU) {
if (!LookupTable)
LookupTable = llvm::make_unique<ASTImporterLookupTable>(*ToTU);
}
ASTImporter &
CrossTranslationUnitContext::getOrCreateASTImporter(ASTContext &From) {
auto I = ASTUnitImporterMap.find(From.getTranslationUnitDecl());
if (I != ASTUnitImporterMap.end())
return *I->second;
lazyInitLookupTable(Context.getTranslationUnitDecl());
ASTImporter *NewImporter = new ASTImporter(
Context, Context.getSourceManager().getFileManager(), From,
From.getSourceManager().getFileManager(), false, LookupTable.get());
ASTUnitImporterMap[From.getTranslationUnitDecl()].reset(NewImporter);
return *NewImporter;
}
} // namespace cross_tu
} // namespace clang