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Common language runtime clr
- 1. Common language runtime CLR M.SandhiyaM.SC(IT) Department of CS&IT Nadar Saraswathi College of Arts Science Theni
- 2. Common Language Runtime (CLR) • Net Framework: provides runtime environment called Common Language Runtime (CLR).It provides an environment to run all the Programs. The code which runs under the CLR is called as Managed Code. Programmers need not to worry on managing the memory if the programs are running under the CLR as it provides memory management and thread management. Programmatically, when our program needs memory, CLR allocates the memory for scope and de-allocates the memory if the scope is completed. Language Compilers (e.g. C#, VB.Net, J#) will convert the Code/Program to Microsoft Intermediate Language (MSIL) intern this will be converted to Native Code by CLR. See the below Fig.
- 3. Native code
- 4. Net Framework Class Library (FCL) • This is also called as Base Class Library and it is common for all types of applications i.e. the way you access the Library Classes and Methods in VB.NET will be the same in C#, and it is common for all other languages in .NET. The following are different types of applications that can make use of net class library. • 1. Windows Application. • 2. Console Application • 3. Web Application. • 4.XML Web Services. • 5.Windows Services. In short, developers just need to import the BCL in their language code and use its predefined methods and properties to implement common and complex functions like reading and writing to file, graphic rendering, database interaction, and XML document manipulation. Below are the few more concepts that we need to know and understand as part of this Net framework. Common Type System (CTS) It describes set of data types that can be used in different Net languages in common. (i.e.) CTS ensures that objects written in different .NET languages can interact with each other. For Communicating between programs written in any .NET complaint language, the types have to be compatible on the basic level.
- 5. Common Type System (CTS) It describes set of data types that can be used in different .Net languages in common. (i.e), CTS ensures that objects written in different Net languages can interact with each other.For Communicating between programs written in any . NET complaint language, the types have to be compatible on the basic level.
- 6. common type system The common type system supports two general categories of types: • Value types: Value types directly contain their data, and instances of value types are either allocated on the stack or allocated inline in a structure. Value types can be built-in (implemented by the runtime), user-defined, or enumerations. Reference types: Reference types store a reference to the value's memory address, and are allocated on the heap. Reference types can be self-describing types, pointer types, or interface types. The type of a reference type can be determined from values of self-describing types. Self-describing types are further split into arrays and class types. The class types are user- defined classes, boxed value types, and delegates.
- 7. CommonLanguageSpecification(CLS) • It is a sub set of CTS and it specifies a set of rules that needs to be adhered or satisfied by all language compilers targeting CLR. • It helps in cross language inheritance and cross language debugging.
- 9. Common language specification Rules: • It describes the minimal and complete set of features to produce code that can be hosted by CLR. It ensures that products of compilers will work properly in .NET environment. • Sample Rules: • 1. Representation of text strings • 2. Internal representation of enumerations • 3. Definition of static members and this is a subset of the CTS which all .NET languages are expected to support. • 4. Microsoft has defined CLS which are nothing but guidelines that language to follow so that it can communicate with other .NET languages in a seamless manner. • Below mentioned the .Net Architecture stack for easy understanding.
- 10. The components of CLR includes • Class Loader: This loads classes into the runtime. • MSIL to native code compiler: This converts MSIL code into native code. • Code manager: This manager the code during execution i.e provides code check, the resources it needs during execution. • Garbage Collector: provide automatic memory management and avoid memory leaks. • Security Engine: This enforces security restrictions and CAS. • Type Checker: This enforces strict type checking. • Thread Support: This provides multithreading support to applications. • Exception Manager : This provides a mechanism to handle the run-time exceptions. • Debug Engine : Allow you to debug different type of applications. • COM marshaler : This allows .net application to exchange data with COM applications. • BASE Class library : This provides the types the applications needed at runtime.
- 11. runtime
- 12. Main components of CLR • Common Language Specification (CLS) • Common Type System (CTS) • Garbage Collection (GC) • Just In – Time Compiler (JIT) Common Language Specification (CLS): • It is responsible for converting the different .NET programming language syntactical rules and regulations into CLR understandable format. Basically, it provides the Language Interoperability. Language Interoperability means to provide the execution support to other programming languages also in .NET framework. Language Interoperability can be achieved in two ways : Managed Code: The MSIL code which is managed by the CLR is known as the Managed Code. For managed code CLR provides three .NET facilities: CAS(Code Access Security)Exception HandlingAutomatic Memory Management.
- 14. Benefits of CLR: • It improves the performance by providing a richly interact between programs at the run time. • Enhance portability by removing the need of recompiling a program on any operating system that supports it. • Security also increases as it analyzes the MSIL instructions whether they are safe or unsafe. Also, the use of delegates in place of function pointers enhance the type safety and security. • Support automatic memory management with the help of Garbage Collector. • Provides cross-language integration because CTS inside CLR provides a common standard that activates the different languages to extend and share each other’s libraries. • Provides support to use the components that developed in other .NET programming languages. • Provide language, platform, and architecture independency. • It allows the creation of the scalable and multithreaded applications in an easier way as a developer has no need to think about the memory management and security issues. •
- 15. Language Interoperability can be achieved in two ways : Managed Code: The MSIL code which is managed by the CLR is known as the Managed Code. For managed code CLR provides three . CAS(Code Access Security)Exception HandlingAutomatic Memory Management. Unmanaged Code: Before .NET development the programming language like . Components & Win32 API do not generate the MSIL code. So these are not managed by CLR rather managed by Operating System which is called unmanaged code.
- 16. Common Type System (CTS): • Every programming language has its own data type system, so CTS is responsible for the understanding all the data type system of . • NET programming languages and converting them into CLR understandable format which will be a common format. • There are 2 Types: • CTS • NET programming language