The document provides an overview of compilers and their organization. It discusses how compilers translate human-oriented programming languages into machine languages. The main sections describe what compilers do, including the machine codes and target code formats they generate. It also distinguishes between compilers and interpreters. Other sections cover the syntax and semantics of languages, and the typical organization of a compiler into a front-end and back-end. The front-end performs analysis and the back-end performs code generation. Key compiler components like scanners, parsers, type checkers and code generators are also introduced.
The document provides an introduction to compiler design, including:
- A compiler converts a program written in a high-level language into machine code. It can run on a different machine than the target.
- Language processing systems like compilers transform high-level code into a form usable by machines through a series of translations.
- A compiler analyzes source code in two main phases - analysis and synthesis. The analysis phase creates an intermediate representation, and the synthesis phase generates target code from that.
The document summarizes key concepts about compiler design. It defines a compiler as a program that translates source code written in one language into an equivalent executable program in another language. Compilers are classified based on the number of passes, such as single-pass and multi-pass compilers. The document also discusses the analysis-synthesis model of compilation, which involves analyzing the source program to create an intermediate representation, then synthesizing target code from that representation. Major phases of a compiler include lexical analysis, parsing, semantic analysis, code generation, and optimization.
CD - CH1 - Introduction to compiler design.pptxZiyadMohammed17
The document summarizes key concepts about compiler design. It defines a compiler as a program that translates source code written in one language into an equivalent executable program in another language. Compilers are classified based on the number of passes they use, such as single-pass and multi-pass compilers. The analysis-synthesis model is described as the two-part process of compilation involving analysis of the source program and synthesis of the translated code. The phases of a compiler include lexical analysis, parsing, semantic analysis, code generation and optimization.
The document discusses the phases of a compiler. It describes the phases as:
1) Lexical analysis which converts source code into tokens.
2) Syntax analysis which checks the syntax is correct and builds a parse tree.
3) Semantic analysis which checks for semantic errors using symbol tables.
4) Intermediate code generation which converts the parse tree into an intermediate representation.
5) Optimization of the intermediate code.
6) Code generation which converts the optimized intermediate code into assembly code and then machine code.
The document discusses compilers and their role in translating high-level programming languages into machine-readable code. It notes that compilers perform several key functions: lexical analysis, syntax analysis, generation of an intermediate representation, optimization of the intermediate code, and finally generation of assembly or machine code. The compiler allows programmers to write code in a high-level language that is easier for humans while still producing efficient low-level code that computers can execute.
The document summarizes the key phases of a compiler:
1. The compiler takes source code as input and goes through several phases including lexical analysis, syntax analysis, semantic analysis, code optimization, and code generation to produce machine code as output.
2. Lexical analysis converts the source code into tokens, syntax analysis checks the grammar and produces a parse tree, and semantic analysis validates meanings.
3. Code optimization improves the intermediate code before code generation translates it into machine instructions.
The document discusses compilers and their design. It explains that compilers translate human-oriented programming languages into machine languages. It describes the typical structure of a compiler, which includes phases like scanning, parsing, semantic analysis, code generation and optimization. The document also discusses how programming language design and computer architecture influence compiler design considerations.
This document provides an overview of compilers, including their structure and purpose. It discusses:
- What a compiler is and its main functions of analysis and synthesis.
- The history and need for compilers, from early assembly languages to modern high-level languages.
- The structure of a compiler, including lexical analysis, syntax analysis, semantic analysis, code optimization, and code generation.
- Different types of translators like interpreters, assemblers, and linkers.
- Tools that help in compiler construction like scanner generators, parser generators, and code generators.
The document provides an introduction to compiler design, including:
- A compiler converts a program written in a high-level language into machine code. It can run on a different machine than the target.
- Language processing systems like compilers transform high-level code into a form usable by machines through a series of translations.
- A compiler analyzes source code in two main phases - analysis and synthesis. The analysis phase creates an intermediate representation, and the synthesis phase generates target code from that.
The document summarizes key concepts about compiler design. It defines a compiler as a program that translates source code written in one language into an equivalent executable program in another language. Compilers are classified based on the number of passes, such as single-pass and multi-pass compilers. The document also discusses the analysis-synthesis model of compilation, which involves analyzing the source program to create an intermediate representation, then synthesizing target code from that representation. Major phases of a compiler include lexical analysis, parsing, semantic analysis, code generation, and optimization.
CD - CH1 - Introduction to compiler design.pptxZiyadMohammed17
The document summarizes key concepts about compiler design. It defines a compiler as a program that translates source code written in one language into an equivalent executable program in another language. Compilers are classified based on the number of passes they use, such as single-pass and multi-pass compilers. The analysis-synthesis model is described as the two-part process of compilation involving analysis of the source program and synthesis of the translated code. The phases of a compiler include lexical analysis, parsing, semantic analysis, code generation and optimization.
The document discusses the phases of a compiler. It describes the phases as:
1) Lexical analysis which converts source code into tokens.
2) Syntax analysis which checks the syntax is correct and builds a parse tree.
3) Semantic analysis which checks for semantic errors using symbol tables.
4) Intermediate code generation which converts the parse tree into an intermediate representation.
5) Optimization of the intermediate code.
6) Code generation which converts the optimized intermediate code into assembly code and then machine code.
The document discusses compilers and their role in translating high-level programming languages into machine-readable code. It notes that compilers perform several key functions: lexical analysis, syntax analysis, generation of an intermediate representation, optimization of the intermediate code, and finally generation of assembly or machine code. The compiler allows programmers to write code in a high-level language that is easier for humans while still producing efficient low-level code that computers can execute.
The document summarizes the key phases of a compiler:
1. The compiler takes source code as input and goes through several phases including lexical analysis, syntax analysis, semantic analysis, code optimization, and code generation to produce machine code as output.
2. Lexical analysis converts the source code into tokens, syntax analysis checks the grammar and produces a parse tree, and semantic analysis validates meanings.
3. Code optimization improves the intermediate code before code generation translates it into machine instructions.
The document discusses compilers and their design. It explains that compilers translate human-oriented programming languages into machine languages. It describes the typical structure of a compiler, which includes phases like scanning, parsing, semantic analysis, code generation and optimization. The document also discusses how programming language design and computer architecture influence compiler design considerations.
This document provides an overview of compilers, including their structure and purpose. It discusses:
- What a compiler is and its main functions of analysis and synthesis.
- The history and need for compilers, from early assembly languages to modern high-level languages.
- The structure of a compiler, including lexical analysis, syntax analysis, semantic analysis, code optimization, and code generation.
- Different types of translators like interpreters, assemblers, and linkers.
- Tools that help in compiler construction like scanner generators, parser generators, and code generators.
This document provides an overview of compiler design, including:
- The history and importance of compilers in translating high-level code to machine-level code.
- The main components of a compiler including the front-end (analysis), back-end (synthesis), and tools used in compiler construction.
- Key phases of compilation like lexical analysis, syntax analysis, semantic analysis, code optimization, and code generation.
- Types of translators like interpreters, assemblers, cross-compilers and their functions.
- Compiler construction tools that help generate scanners, parsers, translation engines, code generators, and data flow analysis.
This document discusses compilers and their role in translating programs from high-level languages to machine-level languages. It covers the following key points in 3 sentences:
Compilers translate programs written in high-level languages like C++ and Java into machine-level languages understood by computers. They perform various phases like lexical analysis, syntax analysis, semantic analysis, code generation, and optimization to translate and check the source code. Compilers allow software to be written in readable high-level languages and then executed on different machine architectures through the translation to machine-level code.
Chapter 1
Introduction
Programming languages are notations for describing computations to people
and to machines. The world as we know it depends on programming languages,
because all the software running on all the computers was written in some
programming language. But, before a program can be run, it first must be
translated into a form in which it can be executed by a computer.
The software systems that do this translation are called compilers.
This book is about how to design and implement compilers. We shall discover that a few basic ideas can be used to construct translators for a wide
variety of languages and machines. Besides compilers, the principles and techniques for compiler design are applicable to so many other domains that they
are likely to be reused many times in the career of a computer scientist. The
study of compiler writing touches upon programming languages, machine architecture, language theory, algorithms, and software engineering.
In this preliminary chapter, we introduce the different forms of language
translators, give a high level overview of the structure of a typical compiler,
and discuss the trends in programming languages and machine architecture
that are shaping compilers. We include some observations on the relationship
between compiler design and computer-science theory and an outline of the
applications of compiler technology that go beyond compilation. We end with
a brief outline of key programming-language concepts that will be needed for
our study of compilers.
1.1 Language Processors
Simply stated, a compiler is a program that can read a program in one language - the source language - and translate it into an equivalent program in
another language - the target language; see Fig. 1.1. An important role of the
compiler is to report any errors in the source program that it detects during
the translation proc....
If the target program is an executable machine-language program, it can
then be called by the user to process inputs and produce outputs; see Fig. 1.2.
Target Program output tFigure 1.2: Running the target program
An interpreter is another common kind of language processor. Instead of
producing a target program as a translation, an interpreter appears to directly
execute the operations specified in the source program on inputs supplied by
the user, as shown in Fig. 1.3.
source program 1 Interpreter t- output input
Figure 1.3: An interpreter
The machine-language target program produced by a compiler is usually
much faster than an interpreter at mapping inputs to outputs . An interpreter,
however, can usually give better error diagnostics than a compiler, because it
executes the source program statement by statement.
Example 1.1 : Java language processors combine compilation and interpretation, as shown in Fig. 1.4. A Java source program may first be compiled into
an intermediate form called bytecodes. The bytecodes are tinto machine language
immediately be.
Pros and cons of c as a compiler languageAshok Raj
Computer system is made of hardware and software .The hardware understands instructions in the form of electronic charge or binary language in Software programming. So the programs written in High Level Language are fed into a series of tools and OS components to get the desired machine language.This is known as Language Processing System.
The document provides an introduction to compilers. It discusses that compilers are language translators that take source code as input and convert it to another language as output. The compilation process involves multiple phases including lexical analysis, syntax analysis, semantic analysis, code generation, and code optimization. It describes the different phases of compilation in detail and explains concepts like intermediate code representation, symbol tables, and grammars.
This document provides an overview of compilers and translation processes. It defines a compiler as a program that transforms source code into a target language like assembly or machine code. Compilers perform analysis on the source code and synthesis to translate it. Compilers can be one-pass or multi-pass. Other translators include preprocessors, interpreters, assemblers, linkers, loaders, cross-compilers, language converters, rewriters, and decompilers. The history and need for compilers and programming languages is also discussed.
The document provides an introduction to compiler construction including:
1. The objectives of understanding how to build a compiler, use compiler construction tools, understand assembly code and virtual machines, and define grammars.
2. An overview of compilers and interpreters including the analysis-synthesis model of compilation where analysis determines operations from the source program and synthesis translates those operations into the target program.
3. An outline of the phases of compilation including preprocessing, compiling, assembling, and linking source code into absolute machine code using tools like scanners, parsers, syntax-directed translation, and code generators.
Translation of a program written in a source language into a semantically equivalent program written in a target language
It also reports to its users the presence of errors in the source program
This document provides an introduction to compiler design, including definitions of key terms and an overview of the compiler construction process. It discusses what a compiler is, the differences between compilers and interpreters, and the advantages and disadvantages of each. The document then covers the major phases of compiler design: analysis, intermediate code generation, optimization, and code generation. It describes the roles of lexical analysis, parsing, semantic analysis, and code generation. Finally, it lists some common tools used in compiler construction.
The document provides an overview of compilers by discussing:
1. Compilers translate source code into executable target code by going through several phases including lexical analysis, syntax analysis, semantic analysis, code optimization, and code generation.
2. An interpreter directly executes source code statement by statement while a compiler produces target code as translation. Compiled code generally runs faster than interpreted code.
3. The phases of a compiler include a front end that analyzes the source code and produces intermediate code, and a back end that optimizes and generates the target code.
This document provides an overview of compilers and their functions. It discusses:
- The main phases of a compiler are analysis and synthesis. Analysis decomposes the source code into an intermediate representation, while synthesis generates the target program from that representation.
- Compilers translate human-oriented programming languages into machine languages to be executed by computers. They perform analysis of the source program and synthesis of machine-language code.
- Compilers generate different types of code like pure machine code, augmented machine code, or virtual machine code. They can also output assembly code or binary formats.
This document provides an overview of compilers and their functions. It discusses:
- The main phases of a compiler are analysis and synthesis. Analysis decomposes the source code into an intermediate representation, while synthesis generates the target program from that representation.
- Compilers translate human-oriented programming languages into machine languages to be executed by computers. They perform analysis of the source program and synthesis of machine-language code.
- Compilers generate different types of code like pure machine code, augmented machine code, or virtual machine code. They can also output assembly code or binary formats.
The document provides an overview of the compilation process and the different phases involved in compiler construction. It can be summarized as follows:
1. A compiler translates a program written in a source language into an equivalent program in a target language. It performs analysis, synthesis and error checking during this translation process.
2. The major phases of a compiler include lexical analysis, syntax analysis, semantic analysis, intermediate code generation, code optimization, code generation and linking. Tools like Lex and Yacc are commonly used to generate lexical and syntax analyzers.
3. Regular expressions are used to specify patterns for tokens during lexical analysis. A lexical analyzer reads the source program and generates a sequence of tokens by matching character sequences to patterns
This document provides an introduction to compilers. It discusses how compilers bridge the gap between high-level programming languages that are easier for humans to write in and machine languages that computers can actually execute. It describes the various phases of compilation like lexical analysis, syntax analysis, semantic analysis, code generation, and optimization. It also compares compilers to interpreters and discusses different types of translators like compilers, interpreters, and assemblers.
The document provides an overview of compiler design and the various phases involved in compiling a program from a high-level language to machine code. It describes the six main phases as lexical analysis, syntax analysis, semantic analysis, intermediate code generation, code optimization, and code generation. It explains the functions of each phase and how the output of one phase feeds into the next until an optimized machine code is produced for execution.
System programming involves designing and implementing system programs like operating systems, compilers, linkers, and loaders that allow user programs to run efficiently on a computer system. A key part of system programming is developing system software like operating systems, assemblers, compilers, and debuggers. An operating system acts as an interface between the user and computer hardware, managing processes, memory, devices, and files. Assemblers and compilers translate programs into machine-readable code. Loaders place object code into memory for execution. System programming optimizes computer system performance and resource utilization.
The document discusses the phases of compilation:
1. The front-end performs lexical, syntax and semantic analysis to generate an intermediate representation and includes error handling.
2. The back-end performs code optimization and generation to produce efficient machine-specific code from the intermediate representation.
3. Key phases include lexical and syntax analysis, semantic analysis, intermediate code generation, code optimization, and code generation.
System software includes operating systems and utilities that enable computer functions. Application software performs real work for users, like word processors and spreadsheets. There are several software development models including:
- Waterfall model which progresses in linear stages from requirements to implementation.
- V-shaped model emphasizes testing at each stage to validate the product.
- Prototyping model involves building prototypes, getting user feedback, and refining iteratively until the user is satisfied.
The document discusses different types of compilers including native code compilers, cross compilers, source-to-source compilers, one pass compilers, and multi-pass compilers. Native code compilers compile source code for the same platform, while cross compilers compile for different platforms. Source-to-source compilers translate source code from one programming language to another. One pass compilers analyze and generate code in a single pass, whereas multi-pass compilers perform compilation over multiple phases.
System software module 1 presentation filejithujithin657
The document discusses system software and its key components. It defines system software as programs that manage computer hardware resources and provide a platform for other software. It describes common types of system software like operating systems, assemblers, compilers, linkers, loaders, and interpreters. It explains the functions of these components like memory management, process scheduling, translation between assembly and machine language, and linking of programs.
A Study of Variable-Role-based Feature Enrichment in Neural Models of CodeAftab Hussain
Understanding variable roles in code has been found to be helpful by students
in learning programming -- could variable roles help deep neural models in
performing coding tasks? We do an exploratory study.
- These are slides of the talk given at InteNSE'23: The 1st International Workshop on Interpretability and Robustness in Neural Software Engineering, co-located with the 45th International Conference on Software Engineering, ICSE 2023, Melbourne Australia
This document provides an overview of compiler design, including:
- The history and importance of compilers in translating high-level code to machine-level code.
- The main components of a compiler including the front-end (analysis), back-end (synthesis), and tools used in compiler construction.
- Key phases of compilation like lexical analysis, syntax analysis, semantic analysis, code optimization, and code generation.
- Types of translators like interpreters, assemblers, cross-compilers and their functions.
- Compiler construction tools that help generate scanners, parsers, translation engines, code generators, and data flow analysis.
This document discusses compilers and their role in translating programs from high-level languages to machine-level languages. It covers the following key points in 3 sentences:
Compilers translate programs written in high-level languages like C++ and Java into machine-level languages understood by computers. They perform various phases like lexical analysis, syntax analysis, semantic analysis, code generation, and optimization to translate and check the source code. Compilers allow software to be written in readable high-level languages and then executed on different machine architectures through the translation to machine-level code.
Chapter 1
Introduction
Programming languages are notations for describing computations to people
and to machines. The world as we know it depends on programming languages,
because all the software running on all the computers was written in some
programming language. But, before a program can be run, it first must be
translated into a form in which it can be executed by a computer.
The software systems that do this translation are called compilers.
This book is about how to design and implement compilers. We shall discover that a few basic ideas can be used to construct translators for a wide
variety of languages and machines. Besides compilers, the principles and techniques for compiler design are applicable to so many other domains that they
are likely to be reused many times in the career of a computer scientist. The
study of compiler writing touches upon programming languages, machine architecture, language theory, algorithms, and software engineering.
In this preliminary chapter, we introduce the different forms of language
translators, give a high level overview of the structure of a typical compiler,
and discuss the trends in programming languages and machine architecture
that are shaping compilers. We include some observations on the relationship
between compiler design and computer-science theory and an outline of the
applications of compiler technology that go beyond compilation. We end with
a brief outline of key programming-language concepts that will be needed for
our study of compilers.
1.1 Language Processors
Simply stated, a compiler is a program that can read a program in one language - the source language - and translate it into an equivalent program in
another language - the target language; see Fig. 1.1. An important role of the
compiler is to report any errors in the source program that it detects during
the translation proc....
If the target program is an executable machine-language program, it can
then be called by the user to process inputs and produce outputs; see Fig. 1.2.
Target Program output tFigure 1.2: Running the target program
An interpreter is another common kind of language processor. Instead of
producing a target program as a translation, an interpreter appears to directly
execute the operations specified in the source program on inputs supplied by
the user, as shown in Fig. 1.3.
source program 1 Interpreter t- output input
Figure 1.3: An interpreter
The machine-language target program produced by a compiler is usually
much faster than an interpreter at mapping inputs to outputs . An interpreter,
however, can usually give better error diagnostics than a compiler, because it
executes the source program statement by statement.
Example 1.1 : Java language processors combine compilation and interpretation, as shown in Fig. 1.4. A Java source program may first be compiled into
an intermediate form called bytecodes. The bytecodes are tinto machine language
immediately be.
Pros and cons of c as a compiler languageAshok Raj
Computer system is made of hardware and software .The hardware understands instructions in the form of electronic charge or binary language in Software programming. So the programs written in High Level Language are fed into a series of tools and OS components to get the desired machine language.This is known as Language Processing System.
The document provides an introduction to compilers. It discusses that compilers are language translators that take source code as input and convert it to another language as output. The compilation process involves multiple phases including lexical analysis, syntax analysis, semantic analysis, code generation, and code optimization. It describes the different phases of compilation in detail and explains concepts like intermediate code representation, symbol tables, and grammars.
This document provides an overview of compilers and translation processes. It defines a compiler as a program that transforms source code into a target language like assembly or machine code. Compilers perform analysis on the source code and synthesis to translate it. Compilers can be one-pass or multi-pass. Other translators include preprocessors, interpreters, assemblers, linkers, loaders, cross-compilers, language converters, rewriters, and decompilers. The history and need for compilers and programming languages is also discussed.
The document provides an introduction to compiler construction including:
1. The objectives of understanding how to build a compiler, use compiler construction tools, understand assembly code and virtual machines, and define grammars.
2. An overview of compilers and interpreters including the analysis-synthesis model of compilation where analysis determines operations from the source program and synthesis translates those operations into the target program.
3. An outline of the phases of compilation including preprocessing, compiling, assembling, and linking source code into absolute machine code using tools like scanners, parsers, syntax-directed translation, and code generators.
Translation of a program written in a source language into a semantically equivalent program written in a target language
It also reports to its users the presence of errors in the source program
This document provides an introduction to compiler design, including definitions of key terms and an overview of the compiler construction process. It discusses what a compiler is, the differences between compilers and interpreters, and the advantages and disadvantages of each. The document then covers the major phases of compiler design: analysis, intermediate code generation, optimization, and code generation. It describes the roles of lexical analysis, parsing, semantic analysis, and code generation. Finally, it lists some common tools used in compiler construction.
The document provides an overview of compilers by discussing:
1. Compilers translate source code into executable target code by going through several phases including lexical analysis, syntax analysis, semantic analysis, code optimization, and code generation.
2. An interpreter directly executes source code statement by statement while a compiler produces target code as translation. Compiled code generally runs faster than interpreted code.
3. The phases of a compiler include a front end that analyzes the source code and produces intermediate code, and a back end that optimizes and generates the target code.
This document provides an overview of compilers and their functions. It discusses:
- The main phases of a compiler are analysis and synthesis. Analysis decomposes the source code into an intermediate representation, while synthesis generates the target program from that representation.
- Compilers translate human-oriented programming languages into machine languages to be executed by computers. They perform analysis of the source program and synthesis of machine-language code.
- Compilers generate different types of code like pure machine code, augmented machine code, or virtual machine code. They can also output assembly code or binary formats.
This document provides an overview of compilers and their functions. It discusses:
- The main phases of a compiler are analysis and synthesis. Analysis decomposes the source code into an intermediate representation, while synthesis generates the target program from that representation.
- Compilers translate human-oriented programming languages into machine languages to be executed by computers. They perform analysis of the source program and synthesis of machine-language code.
- Compilers generate different types of code like pure machine code, augmented machine code, or virtual machine code. They can also output assembly code or binary formats.
The document provides an overview of the compilation process and the different phases involved in compiler construction. It can be summarized as follows:
1. A compiler translates a program written in a source language into an equivalent program in a target language. It performs analysis, synthesis and error checking during this translation process.
2. The major phases of a compiler include lexical analysis, syntax analysis, semantic analysis, intermediate code generation, code optimization, code generation and linking. Tools like Lex and Yacc are commonly used to generate lexical and syntax analyzers.
3. Regular expressions are used to specify patterns for tokens during lexical analysis. A lexical analyzer reads the source program and generates a sequence of tokens by matching character sequences to patterns
This document provides an introduction to compilers. It discusses how compilers bridge the gap between high-level programming languages that are easier for humans to write in and machine languages that computers can actually execute. It describes the various phases of compilation like lexical analysis, syntax analysis, semantic analysis, code generation, and optimization. It also compares compilers to interpreters and discusses different types of translators like compilers, interpreters, and assemblers.
The document provides an overview of compiler design and the various phases involved in compiling a program from a high-level language to machine code. It describes the six main phases as lexical analysis, syntax analysis, semantic analysis, intermediate code generation, code optimization, and code generation. It explains the functions of each phase and how the output of one phase feeds into the next until an optimized machine code is produced for execution.
System programming involves designing and implementing system programs like operating systems, compilers, linkers, and loaders that allow user programs to run efficiently on a computer system. A key part of system programming is developing system software like operating systems, assemblers, compilers, and debuggers. An operating system acts as an interface between the user and computer hardware, managing processes, memory, devices, and files. Assemblers and compilers translate programs into machine-readable code. Loaders place object code into memory for execution. System programming optimizes computer system performance and resource utilization.
The document discusses the phases of compilation:
1. The front-end performs lexical, syntax and semantic analysis to generate an intermediate representation and includes error handling.
2. The back-end performs code optimization and generation to produce efficient machine-specific code from the intermediate representation.
3. Key phases include lexical and syntax analysis, semantic analysis, intermediate code generation, code optimization, and code generation.
System software includes operating systems and utilities that enable computer functions. Application software performs real work for users, like word processors and spreadsheets. There are several software development models including:
- Waterfall model which progresses in linear stages from requirements to implementation.
- V-shaped model emphasizes testing at each stage to validate the product.
- Prototyping model involves building prototypes, getting user feedback, and refining iteratively until the user is satisfied.
The document discusses different types of compilers including native code compilers, cross compilers, source-to-source compilers, one pass compilers, and multi-pass compilers. Native code compilers compile source code for the same platform, while cross compilers compile for different platforms. Source-to-source compilers translate source code from one programming language to another. One pass compilers analyze and generate code in a single pass, whereas multi-pass compilers perform compilation over multiple phases.
System software module 1 presentation filejithujithin657
The document discusses system software and its key components. It defines system software as programs that manage computer hardware resources and provide a platform for other software. It describes common types of system software like operating systems, assemblers, compilers, linkers, loaders, and interpreters. It explains the functions of these components like memory management, process scheduling, translation between assembly and machine language, and linking of programs.
A Study of Variable-Role-based Feature Enrichment in Neural Models of CodeAftab Hussain
Understanding variable roles in code has been found to be helpful by students
in learning programming -- could variable roles help deep neural models in
performing coding tasks? We do an exploratory study.
- These are slides of the talk given at InteNSE'23: The 1st International Workshop on Interpretability and Robustness in Neural Software Engineering, co-located with the 45th International Conference on Software Engineering, ICSE 2023, Melbourne Australia
Enterprise Resource Planning System includes various modules that reduce any business's workload. Additionally, it organizes the workflows, which drives towards enhancing productivity. Here are a detailed explanation of the ERP modules. Going through the points will help you understand how the software is changing the work dynamics.
To know more details here: https://blogs.nyggs.com/nyggs/enterprise-resource-planning-erp-system-modules/
UI5con 2024 - Boost Your Development Experience with UI5 Tooling ExtensionsPeter Muessig
The UI5 tooling is the development and build tooling of UI5. It is built in a modular and extensible way so that it can be easily extended by your needs. This session will showcase various tooling extensions which can boost your development experience by far so that you can really work offline, transpile your code in your project to use even newer versions of EcmaScript (than 2022 which is supported right now by the UI5 tooling), consume any npm package of your choice in your project, using different kind of proxies, and even stitching UI5 projects during development together to mimic your target environment.
Graspan: A Big Data System for Big Code AnalysisAftab Hussain
We built a disk-based parallel graph system, Graspan, that uses a novel edge-pair centric computation model to compute dynamic transitive closures on very large program graphs.
We implement context-sensitive pointer/alias and dataflow analyses on Graspan. An evaluation of these analyses on large codebases such as Linux shows that their Graspan implementations scale to millions of lines of code and are much simpler than their original implementations.
These analyses were used to augment the existing checkers; these augmented checkers found 132 new NULL pointer bugs and 1308 unnecessary NULL tests in Linux 4.4.0-rc5, PostgreSQL 8.3.9, and Apache httpd 2.2.18.
- Accepted in ASPLOS ‘17, Xi’an, China.
- Featured in the tutorial, Systemized Program Analyses: A Big Data Perspective on Static Analysis Scalability, ASPLOS ‘17.
- Invited for presentation at SoCal PLS ‘16.
- Invited for poster presentation at PLDI SRC ‘16.
Takashi Kobayashi and Hironori Washizaki, "SWEBOK Guide and Future of SE Education," First International Symposium on the Future of Software Engineering (FUSE), June 3-6, 2024, Okinawa, Japan
Mobile App Development Company In Noida | Drona InfotechDrona Infotech
Looking for a reliable mobile app development company in Noida? Look no further than Drona Infotech. We specialize in creating customized apps for your business needs.
Visit Us For : https://www.dronainfotech.com/mobile-application-development/
Introducing Crescat - Event Management Software for Venues, Festivals and Eve...Crescat
Crescat is industry-trusted event management software, built by event professionals for event professionals. Founded in 2017, we have three key products tailored for the live event industry.
Crescat Event for concert promoters and event agencies. Crescat Venue for music venues, conference centers, wedding venues, concert halls and more. And Crescat Festival for festivals, conferences and complex events.
With a wide range of popular features such as event scheduling, shift management, volunteer and crew coordination, artist booking and much more, Crescat is designed for customisation and ease-of-use.
Over 125,000 events have been planned in Crescat and with hundreds of customers of all shapes and sizes, from boutique event agencies through to international concert promoters, Crescat is rigged for success. What's more, we highly value feedback from our users and we are constantly improving our software with updates, new features and improvements.
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3. Outline
• 1.1 History of Compilation
• 1.2 What Compilers Do
• 1.3 Interpreters
• 1.4 Syntax and Semantics
• 1.5 Organization of a Compiler
3
4. Language Processors
• Act as Translators
– Transforming human-oriented programming
languages into computer-oriented machine
languages
4
5. Overview and History
• Compilers are fundamental to modern
computing.
• They act as translators, transforming
human-oriented programming languages
into computer-oriented machine languages.
Programming
Language
(Source)
Compiler
Machine
Language
(Target)
5
6. Overview and History (Cont’d.)
• The first real compiler
– FORTRAN compilers of the late 1950s
• Today, we can build a simple compiler in
a few month.
• Creating an efficient and reliable compiler
is still challenging.
6
7. Overview and History (Cont’d.)
• Compiler technology is largely applicable
and has been employed in rather
unexpected areas.
– Text-formatting languages, like LaTeX
– Silicon compiler for the creation of VLSI circuits
– Command languages of OS
– Query languages of Database systems
7
8. 8
Front-end and Back-end
• Front-end performs the analysis of the
source language code to build the internal
representation, called
intermediate representation (IR).
• Back-end performs the target language
synthesis to generate the target code
(assembly code).
9. 1.2 What Compilers Do
• Compilers may be distinguished in two
ways:
1. By the kind of machine code they generate
2. By the format of the target code they generate
9
10. 10
Machine Code Generated by
Compilers(kind of Machine code)
Pure machine code
– Compiler may generate code for a particular
machine’s instruction set without assuming the
existence of any operating system or library
routines.
– Pure machine code is used in compilers for
system implementation languages, which are
for implementing operating systems or
embedded applications.
11. 11
Machine Code Generated by
Compilers (Cont.)
Augmented machine code
– Compilers generate code for a machine
architecture that is augmented with:
1) operating system routines and
2) runtime language support routines.
12. 12
Machine Code Generated by
Compilers (Cont.)
Virtual machine code
– Compilers generate virtual machine code that is
composed entirely of virtual machine instructions.
– That code can run on any architecture for which a VM
interpreter is available.
• For example, the VM for Java, Java virtual machine (JVM), has a
JVM interpreter.
– Portability is achieved by writing just one virtual
machine (VM) interpreter for all the target architectures.
13. 1.2.2 Target Code Formats
Another way that compilers differ from one another is in the
format of the target code they generate as follows:
1. Assembly Language (Source) Format
• Advantages:
– Simplifies translation:
• A number of code generation decisions (e.g. how to compute
addresses) can be left for the assembler.
– Cross-compilation:
• The compiler executes on one computer but generates code that
executes on another.
• Symbolic form is produced that is easily transferred between different
computers.
– Support experimental programming language designs
• Makes it easier to check the correctness of a compiler, since its output
can be observed.
• Disadvantage:
– Need an additional pass (Assembler)
13
14. 1.2.2 Target Code Formats
2. Relocatable binary
– External references, local instruction addresses, and data addresses
are not yet bound.
– Addresses are assigned relative either to the beginning of the
module or to symbolically named locations.
• Advantages:
– More efficient and more control over the translation process: because
it eliminates one step of calculating absolute addresses.
– Allow modular compilation: breaking up of a large program into
separately compiled pieces.
– Allow cross-language references: calls of assembler routines or
subprograms in other high-level languages
– Support subroutine libraries for example, I/O, storage allocation,
and math routines
• Disadvantage:
– A linkage step is required to support libraries and to produce
absolute binary format that is executable. 14
15. 1.2.2 Target Code Formats
3. Absolute binary
• Advantages:
– Program can be directly executed when the compiler is finished
– No need for intermediate step of linking.
– Faster: allows a program to be prepared and executed in a single
step.
– Guarantee the use of only the most current library routines
– Good for debugging (frequent changes)
• Disadvantages:
– Limited ability to interface with other code
– The program must be recompiled for each execution
15
16. 16
1.3 Interpreters
Compiler vs. Interpreter
Compiler has compilation and execution phases:
1) The compilation phase generates target
program from source program.
2) The execution phase executes the target
program.
(Fig. 1.1).
Interpreter directly interprets (executes) the source
program that reads inputs and writes outputs
(Fig. 1.3).
18. 1.4 Syntax and Semantics
• Syntax: structure
– E.g. context-free grammars (CFGs)
•a=b+c is legal,
•b+c=a is not legal
• Semantics: meaning
– E.g. a = b + c
•is illegal if any of the variables are
undeclared or if b or c is of type Boolean
– Static semantics
– Runtime semantics
18
19. Static Semantics
• A set of rules that specify which
syntactically legal programs are actually
valid
– E.g.: Identifier declaration, type-compatibility
of operators and operands, proper number of
parameters in procedure calls
• Can be specified either formally or
informally
– E.g.: attribute grammars
19
20. An Example of Attribute
Grammars
• Production rule:
– E E+T
• Augmented production rule:
– Eresult Ev1 + Tv2
•if v1.type = numeric and v2.type = numeric
then result.type numeric
else call ERROR( )
20
21. Runtime Semantics
•Runtime, or execution, semantics are
used to specify what a program
computes.
A. Informal These semantics are often specified
very informally in a language manual or report;
B. Formal approaches to defining the runtime
semantics of programming languages.
21
22. The Structure of a Compiler
• Modern compilers are syntax-directed
– Compilation is driven by the syntactic
structure of programs;
– i.e., actions are associated with the structures.
22
23. Tasks performed by compilers
Analysis of the source program such as
scanning and parsing.
•Syntax analysis
•Semantic analysis
Synthesis of a target program such as code
generation, that when executed, will
correctly perform the computations
described by the source program.
23
26. The Scanner
• The scanner begins the analysis of the source
program by reading the input text (character
by character) and grouping individual
characters into tokens such as :
– Identifiers
– Integers
– Reserved words
– Delimiters
• It eliminate unneeded information like comments
• It process compiler control directives.
• It enters preliminary information into symbol table.
26
27. The Parser
• Reading tokens and grouping them into phrases
according to the syntax specification such as
context free grammar CFG
• It usually builds an Abstract Syntax Tree (AST)
as a concise representation of program structure
– (Chap. 2 & 7)
27
28. The Type Checker
(Semantic Analysis)
• Checking the static semantics of each AST
node
– the type checker decorates the AST node by
adding type information to it
– It checks type correctness, reachability and
termination, and exception handling.
– Otherwise, a suitable error message is issued
28
29. Translator (Program Synthesis)
• Translating AST nodes into Intermediate
Representation code (IR) (such as byte code
in Java) that correctly implements the
meaning of the program
• In simple, nonoptimizing compilers, the
translator may generate target code
directly
29
30. The Optimizer
• Optimizer improves IR code’s performance.
• Analyzing and transforming the IR code
generated by the translator into functionally
equivalent but improved code
– Complex
• Optimization can also be done after code
generation
30
31. The Code Generator
• Mapping the IR code generated by the translator
into target machine code (assembly code)
– Machine-dependent, complex
• Register allocation
• Code scheduling
• Automatic construction of code generators has
been actively studied
– Matching a low-level IR to target-instruction
templates
– gcc has machine description files for more than ten
popular computer.
31
32. 328
Organization of a Compiler (Cont.)
Symbol Tables
Scannerr Parser Type Checker
Translator
Optimizer
Code
Generator
Source
Program
Tokens AST
Decorated
AST
Intermediate
Representation
Intermediate
Representation
Target Code
Revised Figure 1.4: A syntax-directed compiler. AST denotes the Abstract
Syntax Tree.
33. Symbol Tables
• A mechanism that allows information to
be associated with identifiers and shared
among compiler phases
– Identifier declaration
– Identifier use
– Type checking
33
34. The Structure of a Compiler
34
Scanner
[Lexical Analyzer]
Parser
[Syntax Analyzer]
Semantic Process
[Semantic analyzer]
Code Generator
[Intermediate Code Generator]
Code Optimizer
Tokens
Parse tree
Abstract Syntax Tree w/ Attributes
Non-optimized Intermediate Code
Optimized Intermediate Code
Code Generator
Target machine code
35. Phases of a Compiler
[Aho, Lam, Sethi, Ullman]
Syntax Analyzer
character stream
target machine code
Lexical Analyzer
Intermediate Code Generator
Code Generator
token stream
syntax tree
intermediate representation
Symbol
Table
Semantic Analyzer
syntax tree
Machine-Independent
Code Optimization
Machine-Dependent
Code Optimization
(optional)
(optional)
35
36. Compiler Writing Tools
• Compiler generators (compiler compilers)
– Scanner generator
– Parser generator
– Symbol table manager
– Attribute grammar evaluator
– Code-generation tools
• Much of the effort in crafting a compiler lies in
writing and debugging the semantic phases
– Usually hand-coded
36
37. Compiler-writing tools
Regular expressions
Scanner generators
Lex (The input to lex consists of a definition of
each token as a regular expression )
Parser generators:
Yacc
Code generator generators
http://catalog.compilertools.net/
37