C++ LLGlobalVariable::setLinkage方法代码示例

void DtoDeclareTypeInfo(TypeInfoDeclaration* tid)
{
    DtoResolveTypeInfo(tid);

    if (tid->ir.declared) return;
    tid->ir.declared = true;

    Logger::println("DtoDeclareTypeInfo(%s)", tid->toChars());
    LOG_SCOPE;

    if (Logger::enabled())
    {
        std::string mangled(tid->mangle());
        Logger::println("type = '%s'", tid->tinfo->toChars());
        Logger::println("typeinfo mangle: %s", mangled.c_str());
    }

    IrGlobal* irg = tid->ir.irGlobal;
    assert(irg->value != NULL);

    // this is a declaration of a builtin __initZ var
    if (tid->tinfo->builtinTypeInfo()) {
        LLGlobalVariable* g = isaGlobalVar(irg->value);
        g->setLinkage(llvm::GlobalValue::ExternalLinkage);
        return;
    }

    // define custom typedef
    tid->llvmDefine();
}

void TypeInfoDeclaration_codegen(TypeInfoDeclaration *decl, IRState *p) {
  IF_LOG Logger::println("TypeInfoDeclaration::codegen(%s)",
                         decl->toPrettyChars());
  LOG_SCOPE;

  if (decl->ir.isDefined()) {
    return;
  }
  decl->ir.setDefined();

  std::string mangled(mangle(decl));
  IF_LOG {
    Logger::println("type = '%s'", decl->tinfo->toChars());
    Logger::println("typeinfo mangle: %s", mangled.c_str());
  }

  IrGlobal *irg = getIrGlobal(decl, true);
  irg->value = gIR->module.getGlobalVariable(mangled);
  if (irg->value) {
    irg->type = irg->value->getType()->getContainedType(0);
    assert(irg->type->isStructTy());
  } else {
    if (builtinTypeInfo(
            decl->tinfo)) { // this is a declaration of a builtin __initZ var
      irg->type = Type::dtypeinfo->type->ctype->isClass()->getMemoryLLType();
    } else {
      irg->type = LLStructType::create(gIR->context(), decl->toPrettyChars());
    }
    irg->value = new llvm::GlobalVariable(gIR->module, irg->type, true,
                                          llvm::GlobalValue::ExternalLinkage,
                                          nullptr, mangled);
  }

  emitTypeMetadata(decl);

  // this is a declaration of a builtin __initZ var
  if (builtinTypeInfo(decl->tinfo)) {
    LLGlobalVariable *g = isaGlobalVar(irg->value);
    g->setLinkage(llvm::GlobalValue::ExternalLinkage);
    return;
  }

  // define custom typedef
  LLVMDefineVisitor v;
  decl->accept(&v);
}

//.........这里部分代码省略.........
    }
    // has class array?
    if (!classInits.empty())
    {
        localClassesTy = llvm::ArrayType::get(classinfoTy, classInits.size());
        localClasses = LLConstantArray::get(localClassesTy, classInits);
    }

    // These must match the values in druntime/src/object_.d
    #define MIstandalone      4
    #define MItlsctor         8
    #define MItlsdtor         0x10
    #define MIctor            0x20
    #define MIdtor            0x40
    #define MIxgetMembers     0x80
    #define MIictor           0x100
    #define MIunitTest        0x200
    #define MIimportedModules 0x400
    #define MIlocalClasses    0x800
    #define MInew             0x80000000   // it's the "new" layout

    llvm::Function* fsharedctor = build_module_shared_ctor();
    llvm::Function* fshareddtor = build_module_shared_dtor();
    llvm::Function* funittest = build_module_unittest();
    llvm::Function* fctor = build_module_ctor();
    llvm::Function* fdtor = build_module_dtor();

    unsigned flags = MInew;
    if (fctor)
        flags |= MItlsctor;
    if (fdtor)
        flags |= MItlsdtor;
    if (fsharedctor)
        flags |= MIctor;
    if (fshareddtor)
        flags |= MIdtor;
#if 0
    if (fgetmembers)
        flags |= MIxgetMembers;
    if (fictor)
        flags |= MIictor;
#endif
    if (funittest)
        flags |= MIunitTest;
    if (importedModules)
        flags |= MIimportedModules;
    if (localClasses)
        flags |= MIlocalClasses;

    if (!needmoduleinfo)
        flags |= MIstandalone;

    b.push_uint(flags); // flags
    b.push_uint(0);     // index

    if (fctor)
        b.push(fctor);
    if (fdtor)
        b.push(fdtor);
    if (fsharedctor)
        b.push(fsharedctor);
    if (fshareddtor)
        b.push(fshareddtor);
#if 0
    if (fgetmembers)
        b.push(fgetmembers);
    if (fictor)
        b.push(fictor);
#endif
    if (funittest)
        b.push(funittest);
    if (importedModules) {
        b.push_size(importInits.size());
        b.push(importedModules);
    }
    if (localClasses) {
        b.push_size(classInits.size());
        b.push(localClasses);
    }

    // Put out module name as a 0-terminated string.
    const char *name = toPrettyChars();
    const size_t len = strlen(name) + 1;
    llvm::IntegerType *it = llvm::IntegerType::getInt8Ty(gIR->context());
    llvm::ArrayType *at = llvm::ArrayType::get(it, len);
    b.push(toConstantArray(it, at, name, len, false));

    // create and set initializer
    LLGlobalVariable *moduleInfoSym = moduleInfoSymbol();
    b.finalize(moduleInfoSym->getType()->getPointerElementType(), moduleInfoSym);
    moduleInfoSym->setLinkage(llvm::GlobalValue::ExternalLinkage);

    if (global.params.isLinux) {
        build_dso_registry_calls(moduleInfoSym);
    } else {
        // build the modulereference and ctor for registering it
        LLFunction* mictor = build_module_reference_and_ctor(moduleInfoSym);
        AppendFunctionToLLVMGlobalCtorsDtors(mictor, 65535, true);
    }
}