For complaints, use another form. Study lib. Upload document Create flashcards. Flashcards Collections. Documents Last activity. Add to Add to collection s Add to saved. Motivation Sdt Questions In Compiler Design 6th Editor for this course Why at all does one need to study compilers?
What is its use? Why should one learn this course? Well these are some of the reasons why you should Sdt Questions In Compiler Design 6th Editor go for it. Form processing, extracting information automatically from forms Compilers, assemblers and linkers High level language Sdt Questions In Compiler Design 6th Editor to language translators Natural language processing Where ever input has a structure one can think of Sdt Questions In Compiler Design 6th Editor language processing Why study compilers?
Compilers use the whole spectrum of language processing technology What will we learn in the course? So here comes the big question finally. What is it that you are going to learn in this course? Any guess? Complete structure of compilers and how various parts Sdt Questions In Compiler Design 6th Editor are composed together to get a compiler Course has theoretical and practical components. Both are needed in implementing programming languages.
The focus will be on practical application of the theory. Emphasis will be Sdt Questions In Compiler Design 6th Editor on sdt questions in compiler design 6th editor and data sdt questions in compiler design 6th editor rather than proofs of correctness of algorithms.
Theory of lexical analysis, parsing, type checking, runtime sdt questions Sdt Questions In Compiler Design 6th Editor in compiler design 6th editor, code generation, optimization without going too deep into the proofs. Techniques for developing lexical analyzers, parsers, type checkers, run time systems, code generator, optimization.
Use of tools and specifications for developing various parts of compilers What do we expect to achieve by the end of the course? Bit of History How are programming languages implemented? Two major strategies: - Interpreters old and much less studied - Compilers very well understood with mathematical foundations.
Some environments provide both interpreter and compiler. Lisp, scheme. All programming was done in assembly language. Cost of software development far exceeded cost of hardware. Low productivity. Speedcoding interpreter: programs ran about 10 times slower than hand written assembly code John Backus in : Proposed a program that translated high level expressions into native machine Sdt Questions In Compiler Design 6th Editor code. Skeptism all. Most people thought it was impossible Fortran I project.
The whole new field of compiler design was started More than half the programmers were using Fortran by The development time was cut down to half Led to enormous amount of theoretical work lexical analysis, parsing, optimization, structured programming, code generation, error recovery.
Modern compilers preserve the basic structure of the Fortran I compiler!!! References 1. Compiler is a program which translates a program written in one language the source language Sdt Questions In Compiler Design 6th Editor to an equivalent program in other language the target language.
The source language is optimized for humans. It is more user-friendly, to some extent platformindependent. They are easier to read, write, and maintain Sdt Questions In Compiler Design 6th Editor Sdt Questions In Compiler Design 6th Editor and hence it is easy to avoid errors. Ultimately, programs written in a sdt questions in compiler Sdt Questions In Compiler Design 6th Editor design 6th editor language must be translated into machine language by a compiler.
The target machine Sdt Questions In Compiler Design 6th Editor Sdt Questions In Compiler Design 6th Editor language is efficient for hardware but lacks readability. Translates from one representation of the program to. Typically from high level source code to low level machine code or object code. Source code is normally optimized for human readability - Expressive: matches our notion of languages and application?! Machine code is optimized for hardware - Redundancy is reduced sdt questions in compiler design 6th editor Information about the intent is lost How to translate?
The high level languages and machine languages differ in level of abstraction. At machine level we deal with memory locations, registers whereas these resources are never accessed in high level languages. But the level of abstraction differs from language to language and some languages are farther from machine code than. Goals of translation - Good performance for the generated code Good performance for generated code: The metric for the quality of the generated code is the ratio between the size of handwritten code and compiled machine sdt questions in compiler design 6th editor for Sdt Questions In Compiler Design 6th Editor same program.
A better compiler is one which generates smaller code. For optimizing compilers this ratio Sdt Questions In Compiler Design 6th Editor will be lesser. Good compile time performance: A handwritten machine code is more efficient than a compiled code in terms of the performance it produces. In other words, the program handwritten in machine code will run faster than compiled code.
In addition to this, the compiler itself must run fast compilation time must be proportional to program size. Correctness is a very important issue. Correctness: A compiler's most important goal is correctness - all valid programs must compile correctly.
How do we check if a compiler is correct i. The complexity of writing a correct compiler is a major Sdt Questions In Compiler Design 6th Editor limitation on the amount of optimization that can be. Can compilers be proven to be correct? Very Sdt Questions In Compiler Design 6th Editor tedious! However, the correctness has an implication on the development cost Many modern compilers share a Sdt Questions In Compiler Design 6th Editor Sdt Questions In Compiler Design 6th Editor common 'two stage' design. The higher the abstraction a compiler can support, the better it is. For Sdt Questions In Compiler Design 6th Editor compiler, the other tools are debugger, assembler, linker, loader, profiler, editor.
If these tools have support for Sdt Questions In Compiler Design 6th Editor Sdt Questions In Compiler Design 6th Editor each other than the program development becomes a lot easier. This is how the various tools work in coordination to make programming easier and better. If debugged then do manual correction in the code if needed, after getting debugging results.
It is the combined contribution of these tools that makes programming a lot easier and efficient. How to translate easily? In order to translate a high level code to a machine code one needs to go step by step, with each step doing Sdt Questions In Compiler Design 6th Editor Sdt Questions In Compiler Design 6th Editor a particular task and passing out its output for the next step in the form of another program representation.
The steps can be parse tree generation, high level intermediate code generation, low level In Compiler Editor 6th Questions Design Sdt intermediate code generation, and then the machine language conversion.
As the translation proceeds the representation becomes more Sdt Questions In Compiler Design 6th Editor and more machine specific, increasingly dealing with registers, memory locations. Each step handles a reasonably simple, logical, and well defined task Design a series of program representations Intermediate representations should be amenable sdt Sdt Questions In Compiler Design 6th Editor questions in compiler design 6th editor program manipulation of various kinds type checking, optimization, code generation.
Representations Sdt Questions In Compiler Design 6th Editor become more machines specific and less language specific as the translation proceeds The first few steps Sdt Questions In Compiler Design 6th Editor The first few sdt questions in compiler design 6th editor of compilation like lexical, syntax and semantic analysis can be understood by sdt questions in compiler design 6th editor analogies to the human way of comprehending a natural language. The first step in understanding a natural language will be to recognize characters, i.
Similarly the compiler has to recognize the characters used in a programming language. The next step will be to recognize the words which come from a dictionary.
Similarly the programming languages have a dictionary as well as rules to construct words numbers, identifiers. For example - English Sdt Questions In Compiler Design 6th Editor text consists of lower and upper case alphabets, digits, punctuations and white spaces - Written programs consist Sdt Questions In Compiler Design 6th Editor of characters from the ASCII characters set normally The next step to understand the sentence is recognizing words lexical analysis - English language words can be found in dictionaries - Programming languages have Sdt Questions In Compiler Design 6th Editor a dictionary keywords.
For example: ist his ase nte nce? These words must be separated by some predefined delimiter or there may be some rules imposed by the language for breaking the sentence into tokens or words which are then passed on to the next phase of syntax analysis.
In programming languages, a character from a different class may also be considered sdt questions in compiler design 6th editor a word separator The next step Once the words are understood, the next step is to understand the structure of the sentence. The process is known as syntax checking or parsing Sdt Questions In Compiler Design 6th Editor Syntax analysis also called as parsing is a process of imposing a hierarchical tree like structure on the token stream.
It is basically like generating sentences for the language using language specific grammatical Sdt Questions In Sdt Questions In Compiler Design 4th Edition Compiler Design 6th Editor Questions 6th Compiler Editor In Design Sdt rules as we have in our natural language Ex. Parsing Just like a natural language, a programming language also has a set of grammatical rules and hence can be broken down into a parse tree by the parser.
It is on this parse tree that the further steps of semantic Sdt Questions In Compiler Design 6th Editor Sdt Questions In Compiler Design 6th Editor Sdt Questions In Compiler Design 6th Editor analysis are carried. This is also used during generation of the intermediate language code. Yacc yet another compiler compiler is a program that generates parsers in the C programming language. Understanding the meaning Once the sentence structure is understood we try to understand the meaning of the sentence semantic analysis Design Editor Sdt 6th In Questions Compiler Sdt Questions In Compiler Design 6th Editor Example: Prateek said Nitin left his assignment at home What does his refer to?
Prateek or Sdt Questions In Compiler Design 6th Editor Nitin? Even worse case Amit said Amit left his assignment at home How many Amits are there? Which one left the assignment?
Semantic analysis is the process of examining the statements and to make Sdt Questions In Compiler Design 6th Editor Sdt Questions In Compiler Design 6th Editor sure that they make sense. During the sdt questions in compiler design 6th editor analysis, the Sdt Questions In Compiler Design 6th Editor types, values, and other required information about statements are recorded, checked, and transformed appropriately sdt questions in Sdt Questions In Compiler Design 6th Editor compiler design 6th editor make sure the program makes sense.
Ideally there should be no ambiguity in the grammar of the language. Each sentence should have just one meaning Semantic Analysis Too hard to compilers. They do not have capabilities similar to human understanding.
A hows as well as wheres have mutated a littlea refrigerant as well as mercury. About 1980, it ought to be even with a underside of a sides. This glove is done of 5 wooden needles with the surface spread out over it.
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