A single pass assembler scans the program only once and creates the equivalent binary program. The assembler substitute all of the symbolic instruction with machine code in one pass.
Description of all types of Loaders from System programming subjects.
eg. Compile-Go Loader
General Loader
Absolute Loader
Relocating Loader
Practical Relocating Loader
Linking Loader
Linker Vs. Loader
general relocatable loader
LANGUAGE PROCESSING SYSTEM
COMPILER DESIGN- ARCHITECTURE
INTERPRETER
ROLE OF COMPILER & INTERPRETER
COMPARISION OF INTERPRETER & COMPILER
PURE AND IMPUTER INTERPRETER
P-CODE COMPILERS
A single pass assembler scans the program only once and creates the equivalent binary program. The assembler substitute all of the symbolic instruction with machine code in one pass.
Description of all types of Loaders from System programming subjects.
eg. Compile-Go Loader
General Loader
Absolute Loader
Relocating Loader
Practical Relocating Loader
Linking Loader
Linker Vs. Loader
general relocatable loader
LANGUAGE PROCESSING SYSTEM
COMPILER DESIGN- ARCHITECTURE
INTERPRETER
ROLE OF COMPILER & INTERPRETER
COMPARISION OF INTERPRETER & COMPILER
PURE AND IMPUTER INTERPRETER
P-CODE COMPILERS
A Parser is an integral part when building a Domain Specific Language or file format parser, such as our example usage case: the Ical format. This session will cover the general concept about tokenizing and parsing into a datastructure, as well as going into depth about how to keep the memory footprint and runtime low with the help of a stream-tokenizer.
We have learnt that any computer system is made of hardware and software.
The hardware understands a language, which humans cannot understand. So we write programs in high-level language, which is easier for us to understand and remember.
These programs are then fed into a series of tools and OS components to get the desired code that can be used by the machine.
This is known as Language Processing System.
In this PPT we covered all the points like..Introduction to compilers - Design issues, passes, phases, symbol table
Preliminaries - Memory management, Operating system support for compiler, Compiler support for garbage collection ,Lexical Analysis - Tokens, Regular Expressions, Process of Lexical analysis, Block Schematic, Automatic construction of lexical analyzer using LEX, LEX features and specification.
Unit 8 - Information and Communication Technology (Paper I).pdfThiyagu K
This slides describes the basic concepts of ICT, basics of Email, Emerging Technology and Digital Initiatives in Education. This presentations aligns with the UGC Paper I syllabus.
2024.06.01 Introducing a competency framework for languag learning materials ...Sandy Millin
http://sandymillin.wordpress.com/iateflwebinar2024
Published classroom materials form the basis of syllabuses, drive teacher professional development, and have a potentially huge influence on learners, teachers and education systems. All teachers also create their own materials, whether a few sentences on a blackboard, a highly-structured fully-realised online course, or anything in between. Despite this, the knowledge and skills needed to create effective language learning materials are rarely part of teacher training, and are mostly learnt by trial and error.
Knowledge and skills frameworks, generally called competency frameworks, for ELT teachers, trainers and managers have existed for a few years now. However, until I created one for my MA dissertation, there wasn’t one drawing together what we need to know and do to be able to effectively produce language learning materials.
This webinar will introduce you to my framework, highlighting the key competencies I identified from my research. It will also show how anybody involved in language teaching (any language, not just English!), teacher training, managing schools or developing language learning materials can benefit from using the framework.
June 3, 2024 Anti-Semitism Letter Sent to MIT President Kornbluth and MIT Cor...Levi Shapiro
Letter from the Congress of the United States regarding Anti-Semitism sent June 3rd to MIT President Sally Kornbluth, MIT Corp Chair, Mark Gorenberg
Dear Dr. Kornbluth and Mr. Gorenberg,
The US House of Representatives is deeply concerned by ongoing and pervasive acts of antisemitic
harassment and intimidation at the Massachusetts Institute of Technology (MIT). Failing to act decisively to ensure a safe learning environment for all students would be a grave dereliction of your responsibilities as President of MIT and Chair of the MIT Corporation.
This Congress will not stand idly by and allow an environment hostile to Jewish students to persist. The House believes that your institution is in violation of Title VI of the Civil Rights Act, and the inability or
unwillingness to rectify this violation through action requires accountability.
Postsecondary education is a unique opportunity for students to learn and have their ideas and beliefs challenged. However, universities receiving hundreds of millions of federal funds annually have denied
students that opportunity and have been hijacked to become venues for the promotion of terrorism, antisemitic harassment and intimidation, unlawful encampments, and in some cases, assaults and riots.
The House of Representatives will not countenance the use of federal funds to indoctrinate students into hateful, antisemitic, anti-American supporters of terrorism. Investigations into campus antisemitism by the Committee on Education and the Workforce and the Committee on Ways and Means have been expanded into a Congress-wide probe across all relevant jurisdictions to address this national crisis. The undersigned Committees will conduct oversight into the use of federal funds at MIT and its learning environment under authorities granted to each Committee.
• The Committee on Education and the Workforce has been investigating your institution since December 7, 2023. The Committee has broad jurisdiction over postsecondary education, including its compliance with Title VI of the Civil Rights Act, campus safety concerns over disruptions to the learning environment, and the awarding of federal student aid under the Higher Education Act.
• The Committee on Oversight and Accountability is investigating the sources of funding and other support flowing to groups espousing pro-Hamas propaganda and engaged in antisemitic harassment and intimidation of students. The Committee on Oversight and Accountability is the principal oversight committee of the US House of Representatives and has broad authority to investigate “any matter” at “any time” under House Rule X.
• The Committee on Ways and Means has been investigating several universities since November 15, 2023, when the Committee held a hearing entitled From Ivory Towers to Dark Corners: Investigating the Nexus Between Antisemitism, Tax-Exempt Universities, and Terror Financing. The Committee followed the hearing with letters to those institutions on January 10, 202
Synthetic Fiber Construction in lab .pptxPavel ( NSTU)
Synthetic fiber production is a fascinating and complex field that blends chemistry, engineering, and environmental science. By understanding these aspects, students can gain a comprehensive view of synthetic fiber production, its impact on society and the environment, and the potential for future innovations. Synthetic fibers play a crucial role in modern society, impacting various aspects of daily life, industry, and the environment. ynthetic fibers are integral to modern life, offering a range of benefits from cost-effectiveness and versatility to innovative applications and performance characteristics. While they pose environmental challenges, ongoing research and development aim to create more sustainable and eco-friendly alternatives. Understanding the importance of synthetic fibers helps in appreciating their role in the economy, industry, and daily life, while also emphasizing the need for sustainable practices and innovation.
Operation “Blue Star” is the only event in the history of Independent India where the state went into war with its own people. Even after about 40 years it is not clear if it was culmination of states anger over people of the region, a political game of power or start of dictatorial chapter in the democratic setup.
The people of Punjab felt alienated from main stream due to denial of their just demands during a long democratic struggle since independence. As it happen all over the word, it led to militant struggle with great loss of lives of military, police and civilian personnel. Killing of Indira Gandhi and massacre of innocent Sikhs in Delhi and other India cities was also associated with this movement.
Model Attribute Check Company Auto PropertyCeline George
In Odoo, the multi-company feature allows you to manage multiple companies within a single Odoo database instance. Each company can have its own configurations while still sharing common resources such as products, customers, and suppliers.
3. Agenda of today presentation
• What is Compiler
• Brief History of compiler
• Task of compiler
• Phases of compiler
source code
Compiler
Machine code
4. What is Compiler
• Is a program that translates one language
to another
• Takes as input a source program typically
written in a high-level language
• Produces an equivalent target program
typically in assembly or machine language
• Reports error messages as part of the
translation process
5. Brief history of Compiler
• The term “compiler” was coined in the early
1950s by Grace Murray Hopper
• The first compiler of the high-level language
FORTRAN was developed between 1954 and
1957 at IBM
• The first FORTRAN compiler took 18 person-
years to create
6. Compiler tasks
A compiler must perform two tasks:
analysis of source program: The analysis part breaks up the
source program into constituent pieces and imposes a
grammatical structure on them. It then uses this structure to
create an intermediate representation of the source program.
synthesis of its corresponding program: constructs the
desired target program from the intermediate representation
and the information in the symbol table.
The analysis part is often called the front end of the compiler;
the synthesis part is the back end.
8. Lexical Analysis (scanner): The
first phase of a compiler
• Lexical analyzer reads the stream of characters making up the source
program and groups the characters into meaningful sequences called
lexeme
• For each lexeme, the lexical analyzer produces a token of the form that it
passes on to the subsequent phase, syntax analysis(token-name, attribute-
value)
• Token-name: an abstract symbol is used during syntax analysis, an
• attribute-value: points to an entry in the symbol table for this token.
• Tokensrepresent basic program entities such as:
Identifiers, Literals, Reserved Words, Operators, Delimiters, etc.
9. Example:
1.”position” is a lexeme mapped into a token (id,
1), where id is an abstract symbol standing
for identifier and 1 points to the symbol table
entry for position. The symbol-table entry for
an identifier holds information about the
identifier, such as its name and type.
2. = is a lexeme that is mapped into the token (=).
Since this token needs no attribute-value, we
have omitted the second component. For
notational convenience, the lexeme itself is
used as the name of the abstract symbol.
3. “initial” is a lexeme that is mapped into the
token (id, 2), where 2 points to the symbol-
table entry for initial.
4. + is a lexeme that is mapped into the token (+).
5. “rate” is a lexeme mapped into the token (id,
3), where 3 points to the symbol-table entry
for rate.
6. * is a lexeme that is mapped into the token
(*) .
7. 60 is a lexeme that is mapped into the token
(60)
Blanks separating the lexemes would be discarded
by the lexical analyzer.
position = initial + 60
*
rate
Table
id 1
id 2
id 3
token lexem
10. Syntax Analysis (parser) : The second phase of the
compiler
• The parser uses the first components of the tokens produced by the lexical
analyzer to create a tree-like intermediate representation that depicts the
grammatical structure of the token stream.
• A typical representation is a syntax tree in which each interior node
represents an operation and the children of the node represent the
arguments of the operation
token is
id1 += *id3id2 60
11. Syntax Analysis Example
Pay = Base + Rate* 60
The seven tokens are grouped into a parse tree
Assignment stmt
identifier
pay
= expression
expression expression
+
identifier
base
Rate*60
12. Semantic Analysis: Third phase of the compiler
The semantics of a program are its meaningas opposed to syntax or structure
The semantics consist of:
Runtime semantics
behavior of program at runtime
Static semantics–checked by the compile
Static semantics include:
Static semantics–checked by the compile
Declarations of variables and constants before use
Calling functions that exist (predefined in a library or defined by the user)
Passing parameters properly
Type checking.
Annotates the syntax tree with type information
13. Semantic Analysis: Third phase of the compiler
The semantics of a program are its meaningas
opposed to syntax or structure
The semantics consist of:
Runtime semantics
behavior of program at runtime
Static semantics–checked by the compile
Static semantics include:
Static semantics–checked by the compile
Declarations of variables and constants before
use
Calling functions that exist (predefined in a
library or defined by the user)
Passing parameters properly
Type checking.
Annotates the syntax tree with type information
14. Intermediate Code Generation: three-address code
After syntax and semantic analysis of the source program, many compilers
generate an explicit low-level or machine-like intermediate representation
(a program for an abstract machine). This intermediate representation
should have two important properties:
– it should be easy to produce and
– it should be easy to translate into the target machine.
The considered intermediate form called three-address code, which consists of
a sequence of assembly-like instructions with three operands per
instruction. Each operand can act like a register.
15. Code Optimization: to generate better target
code
• The machine-independent code-optimization phase attempts to improve the
intermediate code so that better target code will result.
• Usually better means:
– faster, shorter code, or target code that consumes less power.
• The optimizer can deduce that the conversion of 60 from integer to floating
point can be done once and for all at compile time, so the int to float
operation can be eliminated by replacing the integer 60 by the floating-point
number 60.0. Moreover, t3 is used only once
• There are simple optimizations that significantly improve the running time
of the target program without slowing down compilation too much.
16. Code Generation: takes as input an intermediate representation
of the source program and maps it into the target language
• If the target language is machine, code, registers or memory locations
are selected for each of the variables used by the program.
• Then, the intermediate instructions are translated into sequences of
machine instructions that perform the same task.
• A crucial aspect of code generation is the judicious assignment of
registers to hold variables.