path: root/lldb/source/Expression/ClangASTSource.cpp

//===-- ClangASTSource.cpp ---------------------------------------*- C++ -*-===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//


#include "clang/AST/ASTContext.h"
#include "lldb/Core/Log.h"
#include "lldb/Core/Module.h"
#include "lldb/Core/ModuleList.h"
#include "lldb/Expression/ASTDumper.h"
#include "lldb/Expression/ClangASTSource.h"
#include "lldb/Expression/ClangExpression.h"
#include "lldb/Symbol/ClangNamespaceDecl.h"
#include "lldb/Symbol/SymbolVendor.h"
#include "lldb/Target/Target.h"

using namespace clang;
using namespace lldb_private;

ClangASTSource::~ClangASTSource() 
{
}

void
ClangASTSource::StartTranslationUnit(ASTConsumer *Consumer) 
{
    if (!m_ast_context)
        return;
    
    m_ast_context->getTranslationUnitDecl()->setHasExternalVisibleStorage();
    m_ast_context->getTranslationUnitDecl()->setHasExternalLexicalStorage();
}

// The core lookup interface.
DeclContext::lookup_result 
ClangASTSource::FindExternalVisibleDeclsByName
(
    const DeclContext *decl_ctx, 
    DeclarationName clang_decl_name
) 
{
    if (!m_ast_context)
        return SetNoExternalVisibleDeclsForName(decl_ctx, clang_decl_name);
    
    if (GetImportInProgress())
        return SetNoExternalVisibleDeclsForName(decl_ctx, clang_decl_name);
        
    std::string decl_name (clang_decl_name.getAsString());

//    if (m_decl_map.DoingASTImport ())
//      return DeclContext::lookup_result();
//        
    switch (clang_decl_name.getNameKind()) {
    // Normal identifiers.
    case DeclarationName::Identifier:
        if (clang_decl_name.getAsIdentifierInfo()->getBuiltinID() != 0)
            return SetNoExternalVisibleDeclsForName(decl_ctx, clang_decl_name);
        break;
            
    // Operator names.  Not important for now.
    case DeclarationName::CXXOperatorName:
    case DeclarationName::CXXLiteralOperatorName:
      return DeclContext::lookup_result();
            
    // Using directives found in this context.
    // Tell Sema we didn't find any or we'll end up getting asked a *lot*.
    case DeclarationName::CXXUsingDirective:
      return SetNoExternalVisibleDeclsForName(decl_ctx, clang_decl_name);
            
    case DeclarationName::ObjCZeroArgSelector:
    case DeclarationName::ObjCOneArgSelector:
    case DeclarationName::ObjCMultiArgSelector:
    {
      llvm::SmallVector<NamedDecl*, 1> method_decls;    

      NameSearchContext method_search_context (*this, method_decls, clang_decl_name, decl_ctx);
     
      FindObjCMethodDecls(method_search_context);

      return SetExternalVisibleDeclsForName (decl_ctx, clang_decl_name, method_decls);
    }
    // These aren't possible in the global context.
    case DeclarationName::CXXConstructorName:
    case DeclarationName::CXXDestructorName:
    case DeclarationName::CXXConversionFunctionName:
      return DeclContext::lookup_result();
    }


    if (!GetLookupsEnabled())
    {
        // Wait until we see a '$' at the start of a name before we start doing 
        // any lookups so we can avoid lookup up all of the builtin types.
        if (!decl_name.empty() && decl_name[0] == '$')
        {
            SetLookupsEnabled (true);
        }
        else
        {               
            return SetNoExternalVisibleDeclsForName(decl_ctx, clang_decl_name);
        }
    }

    ConstString const_decl_name(decl_name.c_str());
    
    const char *uniqued_const_decl_name = const_decl_name.GetCString();
    if (m_active_lookups.find (uniqued_const_decl_name) != m_active_lookups.end())
    {
        // We are currently looking up this name...
        return DeclContext::lookup_result();
    }
    m_active_lookups.insert(uniqued_const_decl_name);
//  static uint32_t g_depth = 0;
//  ++g_depth;
//  printf("[%5u] FindExternalVisibleDeclsByName() \"%s\"\n", g_depth, uniqued_const_decl_name);
    llvm::SmallVector<NamedDecl*, 4> name_decls;    
    NameSearchContext name_search_context(*this, name_decls, clang_decl_name, decl_ctx);
    FindExternalVisibleDecls(name_search_context);
    DeclContext::lookup_result result (SetExternalVisibleDeclsForName (decl_ctx, clang_decl_name, name_decls));
//  --g_depth;
    m_active_lookups.erase (uniqued_const_decl_name);
    return result;
}

void
ClangASTSource::CompleteType (TagDecl *tag_decl)
{    
    lldb::LogSP log(lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_EXPRESSIONS));
    
    if (log)
    {
        log->Printf("    [CompleteTagDecl] Completing a TagDecl named %s", tag_decl->getName().str().c_str());
        log->Printf("      [CTD] Before:");
        ASTDumper dumper((Decl*)tag_decl);
        dumper.ToLog(log, "      [CTD] ");
    }
    
    m_ast_importer->CompleteTagDecl (tag_decl);
    
    if (log)
    {
        log->Printf("      [CTD] After:");
        ASTDumper dumper((Decl*)tag_decl);
        dumper.ToLog(log, "      [CTD] ");
    }
}

void
ClangASTSource::CompleteType (clang::ObjCInterfaceDecl *interface_decl)
{    
    lldb::LogSP log(lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_EXPRESSIONS));
    
    if (log)
    {
        log->Printf("    [CompleteObjCInterfaceDecl] Completing an ObjCInterfaceDecl named %s", interface_decl->getName().str().c_str());
        log->Printf("      [COID] Before:");
        ASTDumper dumper((Decl*)interface_decl);
        dumper.ToLog(log, "      [COID] ");    
    }
    
    m_ast_importer->CompleteObjCInterfaceDecl (interface_decl);
    
    if (log)
    {
        log->Printf("      [COID] After:");
        ASTDumper dumper((Decl*)interface_decl);
        dumper.ToLog(log, "      [COID] ");    
    }
}

clang::ExternalLoadResult
ClangASTSource::FindExternalLexicalDecls (const DeclContext *decl_context, 
                                          bool (*predicate)(Decl::Kind),
                                          llvm::SmallVectorImpl<Decl*> &decls)
{    
    lldb::LogSP log(lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_EXPRESSIONS));
    
    const Decl *context_decl = dyn_cast<Decl>(decl_context);
    
    if (!context_decl)
        return ELR_Failure;
    
    static unsigned int invocation_id = 0;
    unsigned int current_id = invocation_id++;
    
    if (log)
    {
        if (const NamedDecl *context_named_decl = dyn_cast<NamedDecl>(context_decl))
            log->Printf("FindExternalLexicalDecls[%u] in '%s' (a %s) with %s predicate",
                        current_id,
                        context_named_decl->getNameAsString().c_str(),
                        context_decl->getDeclKindName(), 
                        (predicate ? "non-null" : "null"));
        else if(context_decl)
            log->Printf("FindExternalLexicalDecls[%u] in a %s with %s predicate",
                        current_id,
                        context_decl->getDeclKindName(), 
                        (predicate ? "non-null" : "null"));
        else
            log->Printf("FindExternalLexicalDecls[%u] in a NULL context with %s predicate",
                        current_id,
                        (predicate ? "non-null" : "null"));
    }
    
    Decl *original_decl = NULL;
    ASTContext *original_ctx = NULL;
    
    if (!m_ast_importer->ResolveDeclOrigin(context_decl, &original_decl, &original_ctx))
        return ELR_Failure;
    
    if (log)
    {       
        log->Printf("  FELD[%u] Original decl:", current_id);
        ASTDumper(original_decl).ToLog(log, "    ");
    }
    
    if (TagDecl *original_tag_decl = dyn_cast<TagDecl>(original_decl))
    {
        ExternalASTSource *external_source = original_ctx->getExternalSource();
        
        if (external_source)
            external_source->CompleteType (original_tag_decl);
    }
    
    DeclContext *original_decl_context = dyn_cast<DeclContext>(original_decl);
    
    if (!original_decl_context)
        return ELR_Failure;
    
    for (TagDecl::decl_iterator iter = original_decl_context->decls_begin();
         iter != original_decl_context->decls_end();
         ++iter)
    {
        Decl *decl = *iter;
        
        if (!predicate || predicate(decl->getKind()))
        {
            if (log)
            {
                ASTDumper ast_dumper(decl);
                if (const NamedDecl *context_named_decl = dyn_cast<NamedDecl>(context_decl))
                    log->Printf("  FELD[%d] Adding [to %s] lexical decl %s", current_id, context_named_decl->getNameAsString().c_str(), ast_dumper.GetCString());
                else
                    log->Printf("  FELD[%d] Adding lexical decl %s", current_id, ast_dumper.GetCString());
            }
            
            Decl *copied_decl = m_ast_importer->CopyDecl(original_ctx, decl);
            
            decls.push_back(copied_decl);
        }
    }
    
    return ELR_AlreadyLoaded;
}

void
ClangASTSource::FindExternalVisibleDecls (NameSearchContext &context)
{
    assert (m_ast_context);
    
    const ConstString name(context.m_decl_name.getAsString().c_str());
    
    lldb::LogSP log(lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_EXPRESSIONS));
    
    static unsigned int invocation_id = 0;
    unsigned int current_id = invocation_id++;
    
    if (log)
    {
        if (!context.m_decl_context)
            log->Printf("ClangASTSource::FindExternalVisibleDecls[%u] for '%s' in a NULL DeclContext", current_id, name.GetCString());
        else if (const NamedDecl *context_named_decl = dyn_cast<NamedDecl>(context.m_decl_context))
            log->Printf("ClangASTSource::FindExternalVisibleDecls[%u] for '%s' in '%s'", current_id, name.GetCString(), context_named_decl->getNameAsString().c_str());
        else
            log->Printf("ClangASTSource::FindExternalVisibleDecls[%u] for '%s' in a '%s'", current_id, name.GetCString(), context.m_decl_context->getDeclKindName());
    }
    
    context.m_namespace_map.reset(new ClangASTImporter::NamespaceMap);
    
    if (const NamespaceDecl *namespace_context = dyn_cast<NamespaceDecl>(context.m_decl_context))
    {
        ClangASTImporter::NamespaceMapSP namespace_map = m_ast_importer->GetNamespaceMap(namespace_context);
        
        if (log && log->GetVerbose())
            log->Printf("  CAS::FEVD[%u] Inspecting namespace map %p (%d entries)", 
                        current_id, 
                        namespace_map.get(), 
                        (int)namespace_map->size());
        
        if (!namespace_map)
            return;
        
        for (ClangASTImporter::NamespaceMap::iterator i = namespace_map->begin(), e = namespace_map->end();
             i != e;
             ++i)
        {
            if (log)
                log->Printf("  CAS::FEVD[%u] Searching namespace %s in module %s",
                            current_id,
                            i->second.GetNamespaceDecl()->getNameAsString().c_str(),
                            i->first->GetFileSpec().GetFilename().GetCString());
            
            FindExternalVisibleDecls(context,
                                     i->first,
                                     i->second,
                                     current_id);
        }
    }
    else if (!isa<TranslationUnitDecl>(context.m_decl_context))
    {
        // we shouldn't be getting FindExternalVisibleDecls calls for these
        return;
    }
    else
    {
        ClangNamespaceDecl namespace_decl;
        
        if (log)
            log->Printf("  CAS::FEVD[%u] Searching the root namespace", current_id);
        
        FindExternalVisibleDecls(context,
                                 lldb::ModuleSP(),
                                 namespace_decl,
                                 current_id);
    }
    
    if (!context.m_namespace_map->empty())
    {
        if (log && log->GetVerbose())
            log->Printf("  CAS::FEVD[%u] Registering namespace map %p (%d entries)", 
                        current_id,
                        context.m_namespace_map.get(), 
                        (int)context.m_namespace_map->size());
        
        NamespaceDecl *clang_namespace_decl = AddNamespace(context, context.m_namespace_map);
        
        if (clang_namespace_decl)
            clang_namespace_decl->setHasExternalVisibleStorage();
    }
}

void 
ClangASTSource::FindExternalVisibleDecls (NameSearchContext &context, 
                                          lldb::ModuleSP module_sp,
                                          ClangNamespaceDecl &namespace_decl,
                                          unsigned int current_id)
{
    assert (m_ast_context);
    
    lldb::LogSP log(lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_EXPRESSIONS));
    
    SymbolContextList sc_list;
    
    const ConstString name(context.m_decl_name.getAsString().c_str());
    
    const char *name_unique_cstr = name.GetCString();
    
    if (name_unique_cstr == NULL)
        return;
    
    // The ClangASTSource is not responsible for finding $-names.
    if (name_unique_cstr[0] == '$')
        return;
    
    if (module_sp && namespace_decl)
    {
        ClangNamespaceDecl found_namespace_decl;
        
        SymbolVendor *symbol_vendor = module_sp->GetSymbolVendor();
        
        if (symbol_vendor)
        {
            SymbolContext null_sc;
            
            found_namespace_decl = symbol_vendor->FindNamespace(null_sc, name, &namespace_decl);
            
            if (found_namespace_decl)
            {
                context.m_namespace_map->push_back(std::pair<lldb::ModuleSP, ClangNamespaceDecl>(module_sp, found_namespace_decl));
                
                if (log)
                    log->Printf("  CAS::FEVD[%u] Found namespace %s in module %s",
                                current_id,
                                name.GetCString(), 
                                module_sp->GetFileSpec().GetFilename().GetCString());
            }
        }
    }
    else 
    {
        ModuleList &images = m_target->GetImages();
        
        for (uint32_t i = 0, e = images.GetSize();
             i != e;
             ++i)
        {
            lldb::ModuleSP image = images.GetModuleAtIndex(i);
            
            if (!image)
                continue;
            
            ClangNamespaceDecl found_namespace_decl;
            
            SymbolVendor *symbol_vendor = image->GetSymbolVendor();
            
            if (!symbol_vendor)
                continue;
            
            SymbolContext null_sc;
            
            found_namespace_decl = symbol_vendor->FindNamespace(null_sc, name, &namespace_decl);
            
            if (found_namespace_decl)
            {
                context.m_namespace_map->push_back(std::pair<lldb::ModuleSP, ClangNamespaceDecl>(image, found_namespace_decl));
                
                if (log)
                    log->Printf("  CAS::FEVD[%u] Found namespace %s in module %s",
                                current_id,
                                name.GetCString(), 
                                image->GetFileSpec().GetFilename().GetCString());
            }
        }
    }
    
    static ConstString id_name("id");
    static ConstString Class_name("Class");
    
    do 
    {
        TypeList types;
        SymbolContext null_sc;
        
        if (module_sp && namespace_decl)
            module_sp->FindTypes(null_sc, name, &namespace_decl, true, 1, types);
        else if(name != id_name && name != Class_name)
            m_target->GetImages().FindTypes (null_sc, name, true, 1, types);
        else
            break;
        
        if (types.GetSize())
        {
            lldb::TypeSP type_sp = types.GetTypeAtIndex(0);
            
            if (log)
            {
                const char *name_string = type_sp->GetName().GetCString();
                
                log->Printf("  CAS::FEVD[%u] Matching type found for \"%s\": %s", 
                            current_id, 
                            name.GetCString(), 
                            (name_string ? name_string : "<anonymous>"));
            }
            
            void *copied_type = GuardedCopyType(m_ast_context, type_sp->GetClangAST(), type_sp->GetClangFullType());
            
            context.AddTypeDecl(copied_type);
        }
    } while(0);
}

void
ClangASTSource::FindObjCMethodDecls (NameSearchContext &context)
{
    lldb::LogSP log(lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_EXPRESSIONS));
    
    static unsigned int invocation_id = 0;
    unsigned int current_id = invocation_id++;
    
    const DeclarationName &decl_name(context.m_decl_name);
    const DeclContext *decl_ctx(context.m_decl_context);
    
    const ObjCInterfaceDecl *interface_decl = dyn_cast<ObjCInterfaceDecl>(decl_ctx);
    
    if (!interface_decl)
        return;
    
    StreamString ss;
    if (decl_name.isObjCZeroArgSelector())
    {
        ss.Printf("%s", decl_name.getAsString().c_str());
    }
    else if (decl_name.isObjCOneArgSelector())
    {
        ss.Printf("%s", decl_name.getAsString().c_str());
    }
    else
    {    
        clang::Selector sel = decl_name.getObjCSelector();
        
        for (unsigned i = 0, e = sel.getNumArgs();
             i != e;
             ++i)
        {
            llvm::StringRef r = sel.getNameForSlot(i);
            ss.Printf("%s:", r.str().c_str()); 
        }
    }     
    ss.Flush();
    
    ConstString selector_name(ss.GetData());
    
    if (log)
        log->Printf("ClangASTSource::FindObjCMethodDecls[%d] for selector [%s %s]",
                    current_id, 
                    interface_decl->getNameAsString().c_str(), 
                    selector_name.AsCString());

    SymbolContextList sc_list;
    
    const bool include_symbols = false;
    const bool append = false;
    
    m_target->GetImages().FindFunctions(selector_name, lldb::eFunctionNameTypeSelector, include_symbols, append, sc_list);
    
    for (uint32_t i = 0, e = sc_list.GetSize();
         i != e;
         ++i)
    {
        SymbolContext sc;
        
        if (!sc_list.GetContextAtIndex(i, sc))
            continue;
        
        if (!sc.function)
            continue;
        
        DeclContext *function_ctx = sc.function->GetClangDeclContext();
        
        if (!function_ctx)
            continue;
        
        ObjCMethodDecl *method_decl = dyn_cast<ObjCMethodDecl>(function_ctx);
        
        if (!method_decl)
            continue;
        
        ObjCInterfaceDecl *found_interface_decl = method_decl->getClassInterface();
        
        if (!found_interface_decl)
            continue;
        
        if (found_interface_decl->getName() == interface_decl->getName())
        {
            Decl *copied_decl = m_ast_importer->CopyDecl(&method_decl->getASTContext(), method_decl);
            
            if (!copied_decl)
                continue;
            
            ObjCMethodDecl *copied_method_decl = dyn_cast<ObjCMethodDecl>(copied_decl);
            
            if (!copied_method_decl)
                continue;
            
            if (log)
            {
                ASTDumper dumper((Decl*)copied_method_decl);
                log->Printf("  CAS::FOMD[%d] found %s", current_id, dumper.GetCString());
            }
                
            context.AddNamedDecl(copied_method_decl);
        }
    }
}

void 
ClangASTSource::CompleteNamespaceMap (ClangASTImporter::NamespaceMapSP &namespace_map,
                                      const ConstString &name,
                                      ClangASTImporter::NamespaceMapSP &parent_map) const
{
    static unsigned int invocation_id = 0;
    unsigned int current_id = invocation_id++;
    
    lldb::LogSP log(lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_EXPRESSIONS));
    
    if (log)
    {
        if (parent_map && parent_map->size())
            log->Printf("CompleteNamespaceMap[%u] Searching for namespace %s in namespace %s",
                        current_id,
                        name.GetCString(),
                        parent_map->begin()->second.GetNamespaceDecl()->getDeclName().getAsString().c_str());
        else
            log->Printf("CompleteNamespaceMap[%u] Searching for namespace %s",
                        current_id,
                        name.GetCString());
    }
    
    
    if (parent_map)
    {
        for (ClangASTImporter::NamespaceMap::iterator i = parent_map->begin(), e = parent_map->end();
             i != e;
             ++i)
        {
            ClangNamespaceDecl found_namespace_decl;
            
            lldb::ModuleSP module_sp = i->first;
            ClangNamespaceDecl module_parent_namespace_decl = i->second;
            
            SymbolVendor *symbol_vendor = module_sp->GetSymbolVendor();
            
            if (!symbol_vendor)
                continue;
            
            SymbolContext null_sc;
            
            found_namespace_decl = symbol_vendor->FindNamespace(null_sc, name, &module_parent_namespace_decl);
            
            if (!found_namespace_decl)
                continue;
            
            namespace_map->push_back(std::pair<lldb::ModuleSP, ClangNamespaceDecl>(module_sp, found_namespace_decl));
            
            if (log)
                log->Printf("  CMN[%u] Found namespace %s in module %s",
                            current_id,
                            name.GetCString(), 
                            module_sp->GetFileSpec().GetFilename().GetCString());
        }
    }
    else
    {
        ModuleList &images = m_target->GetImages();
        ClangNamespaceDecl null_namespace_decl;
        
        for (uint32_t i = 0, e = images.GetSize();
             i != e;
             ++i)
        {
            lldb::ModuleSP image = images.GetModuleAtIndex(i);
            
            if (!image)
                continue;
            
            ClangNamespaceDecl found_namespace_decl;
            
            SymbolVendor *symbol_vendor = image->GetSymbolVendor();
            
            if (!symbol_vendor)
                continue;
            
            SymbolContext null_sc;
            
            found_namespace_decl = symbol_vendor->FindNamespace(null_sc, name, &null_namespace_decl);
            
            if (!found_namespace_decl)
                continue;
            
            namespace_map->push_back(std::pair<lldb::ModuleSP, ClangNamespaceDecl>(image, found_namespace_decl));
            
            if (log)
                log->Printf("  CMN[%u] Found namespace %s in module %s",
                            current_id,
                            name.GetCString(), 
                            image->GetFileSpec().GetFilename().GetCString());
        }
    }
}

NamespaceDecl *
ClangASTSource::AddNamespace (NameSearchContext &context, ClangASTImporter::NamespaceMapSP &namespace_decls)
{
    if (namespace_decls.empty())
        return NULL;
    
    lldb::LogSP log(lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_EXPRESSIONS));
        
    const ClangNamespaceDecl &namespace_decl = namespace_decls->begin()->second;
    
    Decl *copied_decl = m_ast_importer->CopyDecl(namespace_decl.GetASTContext(), namespace_decl.GetNamespaceDecl());
    
    NamespaceDecl *copied_namespace_decl = dyn_cast<NamespaceDecl>(copied_decl);
    
    m_ast_importer->RegisterNamespaceMap(copied_namespace_decl, namespace_decls);
    
    return dyn_cast<NamespaceDecl>(copied_decl);
}

void * 
ClangASTSource::GuardedCopyType (ASTContext *dest_context, 
                                 ASTContext *source_context,
                                 void *clang_type)
{    
    SetImportInProgress(true);
    
    QualType ret_qual_type = m_ast_importer->CopyType (source_context, QualType::getFromOpaquePtr(clang_type));
    
    void *ret = ret_qual_type.getAsOpaquePtr();
    
    SetImportInProgress(false);
    
    return ret;
}

clang::NamedDecl *
NameSearchContext::AddVarDecl(void *type) 
{
    IdentifierInfo *ii = m_decl_name.getAsIdentifierInfo();
    
    assert (type && "Type for variable must be non-NULL!");
        
    clang::NamedDecl *Decl = VarDecl::Create(*m_ast_source.m_ast_context, 
                                             const_cast<DeclContext*>(m_decl_context), 
                                             SourceLocation(), 
                                             SourceLocation(),
                                             ii, 
                                             QualType::getFromOpaquePtr(type), 
                                             0, 
                                             SC_Static, 
                                             SC_Static);
    m_decls.push_back(Decl);
    
    return Decl;
}

clang::NamedDecl *
NameSearchContext::AddFunDecl (void *type) 
{
    clang::FunctionDecl *func_decl = FunctionDecl::Create (*m_ast_source.m_ast_context,
                                                           const_cast<DeclContext*>(m_decl_context),
                                                           SourceLocation(),
                                                           SourceLocation(),
                                                           m_decl_name.getAsIdentifierInfo(),
                                                           QualType::getFromOpaquePtr(type),
                                                           NULL,
                                                           SC_Static,
                                                           SC_Static,
                                                           false,
                                                           true);
    
    // We have to do more than just synthesize the FunctionDecl.  We have to
    // synthesize ParmVarDecls for all of the FunctionDecl's arguments.  To do
    // this, we raid the function's FunctionProtoType for types.
    
    QualType qual_type (QualType::getFromOpaquePtr(type));
    const FunctionProtoType *func_proto_type = qual_type->getAs<FunctionProtoType>();
    
    if (func_proto_type)
    {        
        unsigned NumArgs = func_proto_type->getNumArgs();
        unsigned ArgIndex;
        
        SmallVector<ParmVarDecl *, 5> parm_var_decls;
                
        for (ArgIndex = 0; ArgIndex < NumArgs; ++ArgIndex)
        {
            QualType arg_qual_type (func_proto_type->getArgType(ArgIndex));
            
            parm_var_decls.push_back(ParmVarDecl::Create (*m_ast_source.m_ast_context,
                                                          const_cast<DeclContext*>(m_decl_context),
                                                          SourceLocation(),
                                                          SourceLocation(),
                                                          NULL,
                                                          arg_qual_type,
                                                          NULL,
                                                          SC_Static,
                                                          SC_Static,
                                                          NULL));
        }
        
        func_decl->setParams(ArrayRef<ParmVarDecl*>(parm_var_decls));
    }
    
    m_decls.push_back(func_decl);
    
    return func_decl;
}

clang::NamedDecl *
NameSearchContext::AddGenericFunDecl()
{
    FunctionProtoType::ExtProtoInfo proto_info;
    
    proto_info.Variadic = true;
    
    QualType generic_function_type(m_ast_source.m_ast_context->getFunctionType (m_ast_source.m_ast_context->UnknownAnyTy,    // result
                                                                                NULL,                                        // argument types
                                                                                0,                                           // number of arguments
                                                                                proto_info));
    
    return AddFunDecl(generic_function_type.getAsOpaquePtr());
}

clang::NamedDecl *
NameSearchContext::AddTypeDecl(void *type)
{
    if (type)
    {
        QualType qual_type = QualType::getFromOpaquePtr(type);

        if (const TagType *tag_type = dyn_cast<clang::TagType>(qual_type))
        {
            TagDecl *tag_decl = tag_type->getDecl();
            
            m_decls.push_back(tag_decl);
            
            return tag_decl;
        }
        else if (const ObjCObjectType *objc_object_type = dyn_cast<clang::ObjCObjectType>(qual_type))
        {
            ObjCInterfaceDecl *interface_decl = objc_object_type->getInterface();
            
            m_decls.push_back((NamedDecl*)interface_decl);
            
            return (NamedDecl*)interface_decl;
        }
    }
    return NULL;
}

void 
NameSearchContext::AddLookupResult (clang::DeclContextLookupConstResult result)
{
    for (clang::NamedDecl * const *decl_iterator = result.first;
         decl_iterator != result.second;
         ++decl_iterator)
        m_decls.push_back (*decl_iterator);
}

void
NameSearchContext::AddNamedDecl (clang::NamedDecl *decl)
{
    m_decls.push_back (decl);
}