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cling/lib/Interpreter/AutoloadCallback.cpp
Vassil Vassilev deafa47202 Remove unused parameters. Fixes -Wunused-parameter.
2021-02-25 20:44:18 +01:00

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//------------------------------------------------------------------------------
// CLING - the C++ LLVM-based InterpreterG :)
// author: Manasij Mukherjee <manasij7479@gmail.com>
// author: Vassil Vassilev <vvasilev@cern.ch>
//
// This file is dual-licensed: you can choose to license it under the University
// of Illinois Open Source License or the GNU Lesser General Public License. See
// LICENSE.TXT for details.
//------------------------------------------------------------------------------
#include "llvm/ADT/SmallVector.h"
#include "llvm/Support/Path.h"
#include "clang/Sema/Sema.h"
#include "clang/Basic/Diagnostic.h"
#include "clang/AST/AST.h"
#include "clang/AST/ASTContext.h" // for operator new[](unsigned long, ASTCtx..)
#include "clang/AST/RecursiveASTVisitor.h"
#include "clang/AST/DeclVisitor.h"
#include "clang/Lex/Preprocessor.h"
#include "clang/Frontend/CompilerInstance.h"
#include "cling/Interpreter/Interpreter.h"
#include "cling/Interpreter/InterpreterCallbacks.h"
#include "cling/Interpreter/AutoloadCallback.h"
#include "cling/Interpreter/Transaction.h"
#include "cling/Utils/Output.h"
#include "DeclUnloader.h"
#include <clang/Lex/HeaderSearch.h>
namespace {
static const char annoTag[] = "$clingAutoload$";
static const size_t lenAnnoTag = sizeof(annoTag) - 1;
}
using namespace clang;
namespace cling {
void AutoloadCallback::report(clang::SourceLocation l, llvm::StringRef name,
llvm::StringRef header) {
Sema& sema= m_Interpreter->getSema();
unsigned id
= sema.getDiagnostics().getCustomDiagID (DiagnosticsEngine::Level::Warning,
"Note: '%0' can be found in %1");
/* unsigned idn //TODO: To be enabled after we have a way to get the full path
= sema.getDiagnostics().getCustomDiagID(DiagnosticsEngine::Level::Note,
"Type : %0 , Full Path: %1")*/;
if (header.startswith(llvm::StringRef(annoTag, lenAnnoTag)))
sema.Diags.Report(l, id) << name << header.drop_front(lenAnnoTag);
}
bool AutoloadCallback::LookupObject (TagDecl *t) {
if (m_ShowSuggestions && t->hasAttr<AnnotateAttr>())
report(t->getLocation(),t->getNameAsString(),t->getAttr<AnnotateAttr>()->getAnnotation());
return false;
}
class AutoLoadingVisitor: public RecursiveASTVisitor<AutoLoadingVisitor> {
private:
///\brief Flag determining the visitor's actions. If true, register autoload
/// entries, i.e. remember the connection between filename and the declaration
/// that needs to be updated on #include of the filename.
/// If false, react on an #include by adjusting the forward decls, e.g. by
/// removing the default template arguments (that will now be provided by
/// the definition read from the include).
bool m_IsStoringState;
bool m_IsAutloadEntry; // True during the traversal of an explicitly annotated decl.
AutoloadCallback::FwdDeclsMap* m_Map;
clang::Preprocessor* m_PP;
clang::Sema* m_Sema;
std::pair<const clang::FileEntry*,const clang::FileEntry*> m_PrevFE;
std::pair<std::string,std::string> m_PrevFileName;
private:
bool IsAutoloadEntry(Decl *D) {
for(auto attr = D->specific_attr_begin<AnnotateAttr>(),
end = D->specific_attr_end<AnnotateAttr> ();
attr != end;
++attr)
{
// cling::errs() << "Annotation: " << c->getAnnotation() << "\n";
if (!attr->isInherited()) {
llvm::StringRef annotation = attr->getAnnotation();
assert(!annotation.empty() && "Empty annotation!");
if (annotation.startswith(llvm::StringRef(annoTag, lenAnnoTag))) {
// autoload annotation.
return true;
}
}
}
return false;
}
using Annotations_t = std::pair<llvm::StringRef,llvm::StringRef>;
void InsertIntoAutoLoadingState(Decl* decl, Annotations_t FileNames) {
assert(m_PP);
auto addFile = [this,decl](llvm::StringRef FileName, bool warn) {
if (FileName.empty()) return (const FileEntry*)nullptr;
const FileEntry* FE = 0;
SourceLocation fileNameLoc;
// Remember this file wth full path, not "./File.h" (ROOT-8863).
bool isAngled = true;
const DirectoryLookup* FromDir = 0;
const FileEntry* FromFile = 0;
const DirectoryLookup* CurDir = 0;
bool needCacheUpdate = false;
if (FileName.equals(m_PrevFileName.first))
FE = m_PrevFE.first;
else if (FileName.equals(m_PrevFileName.second))
FE = m_PrevFE.second;
else {
FE = m_PP->LookupFile(fileNameLoc, FileName, isAngled,
FromDir, FromFile, CurDir, /*SearchPath*/0,
/*RelativePath*/ 0, /*suggestedModule*/0,
/*IsMapped*/0, /*IsFrameworkFound*/ nullptr,
/*SkipCache*/ false,
/*OpenFile*/ false, /*CacheFail*/ true);
needCacheUpdate = true;
}
if (FE) {
auto& Vec = (*m_Map)[FE];
Vec.push_back(decl);
if (needCacheUpdate) return FE;
else return (const FileEntry*)nullptr;
} else if (warn) {
// If the top level header is expected to be findable at run-time,
// the direct header might not because the include path might be
// different enough and only the top-header is guaranteed to be seen
// by the user as an interface header to be available on the
// run-time include path.
cling::errs()
<< "Error in cling::AutoLoadingVisitor::InsertIntoAutoLoadingState:\n"
" Missing FileEntry for " << FileName << "\n";
if (NamedDecl* ND = dyn_cast<NamedDecl>(decl)) {
cling::errs() << " requested to autoload type ";
ND->getNameForDiagnostic(cling::errs(),
ND->getASTContext().getPrintingPolicy(),
true /*qualified*/);
cling::errs() << "\n";
}
return (const FileEntry*)nullptr;
} else {
// Case of the direct header that is not a top level header, no
// warning in this case (to likely to be a false positive).
return (const FileEntry*)nullptr;
}
};
const FileEntry* cacheUpdate;
if ( (cacheUpdate = addFile(FileNames.first,true)) ) {
m_PrevFE.first = cacheUpdate;
m_PrevFileName.first = FileNames.first;
}
if ( (cacheUpdate = addFile(FileNames.second,false)) ) {
m_PrevFE.second = cacheUpdate;
m_PrevFileName.second = FileNames.second;
}
}
public:
AutoLoadingVisitor():
m_IsStoringState(false), m_IsAutloadEntry(false), m_Map(0), m_PP(0),
m_Sema(0), m_PrevFE({nullptr,nullptr})
{}
void RemoveDefaultArgsOf(Decl* D, Sema* S) {
m_Sema = S;
auto cursor = D->getMostRecentDecl();
m_IsAutloadEntry = IsAutoloadEntry(cursor);
TraverseDecl(cursor);
while (cursor != D && (cursor = cursor->getPreviousDecl())) {
m_IsAutloadEntry = IsAutoloadEntry(cursor);
TraverseDecl(cursor);
}
m_IsAutloadEntry = false;
}
void TrackDefaultArgStateOf(Decl* D, AutoloadCallback::FwdDeclsMap& map,
Preprocessor& PP) {
m_IsStoringState = true;
m_Map = &map;
m_PP = &PP;
TraverseDecl(D);
m_PP = 0;
m_Map = 0;
m_IsStoringState = false;
}
bool shouldVisitTemplateInstantiations() { return true; }
bool VisitDecl(Decl* D) {
if (!m_IsStoringState)
return true;
if (!D->hasAttr<AnnotateAttr>())
return true;
Annotations_t annotations;
for(auto attr = D->specific_attr_begin<AnnotateAttr> (),
end = D->specific_attr_end<AnnotateAttr> ();
attr != end;
++attr)
{
if (!attr->isInherited()) {
auto annot = attr->getAnnotation();
if (annot.startswith(llvm::StringRef(annoTag, lenAnnoTag))) {
if (annotations.first.empty()) {
annotations.first = annot.drop_front(lenAnnoTag);
} else {
annotations.second = annot.drop_front(lenAnnoTag);
}
}
}
}
InsertIntoAutoLoadingState(D, annotations);
return true;
}
bool VisitCXXRecordDecl(CXXRecordDecl* D) {
// Since we are only interested in fixing forward declaration
// there is no need to continue on when we see a complete definition.
if (D->isCompleteDefinition())
return false;
if (!D->hasAttr<AnnotateAttr>())
return true;
if (ClassTemplateDecl* TmplD = D->getDescribedClassTemplate())
return VisitTemplateDecl(TmplD);
return true;
}
bool VisitTemplateTypeParmDecl(TemplateTypeParmDecl* D) {
if (m_IsStoringState)
return true;
if (m_IsAutloadEntry) {
if (D->hasDefaultArgument() && !D->defaultArgumentWasInherited())
D->removeDefaultArgument();
} else {
if (D->hasDefaultArgument() && D->defaultArgumentWasInherited())
D->removeDefaultArgument();
}
return true;
}
bool VisitTemplateDecl(TemplateDecl* D) {
if (D->getTemplatedDecl() &&
!D->getTemplatedDecl()->hasAttr<AnnotateAttr>())
return true;
// If we have a definition we might be about to re-#include the
// same header containing definition that was #included previously,
// i.e. we might have multiple fwd decls for the same template.
// DO NOT remove the defaults here; the definition needs to keep it.
// (ROOT-7037)
if (ClassTemplateDecl* CTD = dyn_cast<ClassTemplateDecl>(D))
if (CXXRecordDecl* TemplatedD = CTD->getTemplatedDecl())
if (TemplatedD->getDefinition())
return true;
for(auto P: D->getTemplateParameters()->asArray())
TraverseDecl(P);
return true;
}
bool VisitTemplateTemplateParmDecl(TemplateTemplateParmDecl* D) {
if (m_IsStoringState)
return true;
if (m_IsAutloadEntry) {
if (D->hasDefaultArgument() && !D->defaultArgumentWasInherited())
D->removeDefaultArgument();
} else {
if (D->hasDefaultArgument() && D->defaultArgumentWasInherited())
D->removeDefaultArgument();
}
return true;
}
bool VisitNonTypeTemplateParmDecl(NonTypeTemplateParmDecl* D) {
if (m_IsStoringState)
return true;
if (m_IsAutloadEntry) {
if (D->hasDefaultArgument() && !D->defaultArgumentWasInherited())
D->removeDefaultArgument();
} else {
if (D->hasDefaultArgument() && D->defaultArgumentWasInherited())
D->removeDefaultArgument();
}
return true;
}
bool VisitParmVarDecl(ParmVarDecl* D) {
if (m_IsStoringState)
return true;
if (m_IsAutloadEntry) {
if (D->hasDefaultArg() && !D->hasInheritedDefaultArg())
D->setDefaultArg(nullptr);
} else {
if (D->hasDefaultArg() && D->hasInheritedDefaultArg())
D->setDefaultArg(nullptr);
}
return true;
}
};
void AutoloadCallback::InclusionDirective(clang::SourceLocation /*HashLoc*/,
const clang::Token &/*IncludeTok*/,
llvm::StringRef /*FileName*/,
bool /*IsAngled*/,
clang::CharSourceRange /*FilenameRange*/,
const clang::FileEntry *File,
llvm::StringRef /*SearchPath*/,
llvm::StringRef /*RelativePath*/,
const clang::Module */*Imported*/,
clang::SrcMgr::CharacteristicKind /*FileType*/) {
// If File is 0 this means that the #included file doesn't exist.
if (!File)
return;
auto found = m_Map.find(File);
if (found == m_Map.end())
return; // nothing to do, file not referred in any annotation
AutoLoadingVisitor defaultArgsCleaner;
for (auto D : found->second) {
defaultArgsCleaner.RemoveDefaultArgsOf(D, &getInterpreter()->getSema());
}
// Don't need to keep track of cleaned up decls from file.
m_Map.erase(found);
}
AutoloadCallback::~AutoloadCallback() {
}
void AutoloadCallback::TransactionCommitted(const Transaction &T) {
if (T.decls_begin() == T.decls_end())
return;
if (T.decls_begin()->m_DGR.isNull())
return;
// The first decl must be
// extern int __Cling_AutoLoading_Map;
bool HaveAutoLoadingMapMarker = false;
for (auto I = T.decls_begin(), E = T.decls_end();
!HaveAutoLoadingMapMarker && I != E; ++I) {
if (I->m_Call != cling::Transaction::kCCIHandleTopLevelDecl)
return;
for (auto&& D: I->m_DGR) {
if (isa<EmptyDecl>(D))
continue;
else if (auto VD = dyn_cast<VarDecl>(D)) {
HaveAutoLoadingMapMarker
= VD->hasExternalStorage() && VD->getIdentifier()
&& VD->getName().equals("__Cling_AutoLoading_Map");
if (!HaveAutoLoadingMapMarker)
return;
break;
} else
return;
}
}
if (!HaveAutoLoadingMapMarker)
return;
AutoLoadingVisitor defaultArgsStateCollector;
Preprocessor& PP = m_Interpreter->getCI()->getPreprocessor();
for (auto I = T.decls_begin(), E = T.decls_end(); I != E; ++I)
for (auto&& D: I->m_DGR)
defaultArgsStateCollector.TrackDefaultArgStateOf(D, m_Map, PP);
}
} //end namespace cling
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