unit 3 modules intermediate code generation

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The document discusses intermediate code generation in compilers, focusing on syntax-directed definitions and the semantic analysis phase. It highlights the importance of semantic analysis in verifying the correctness of a program and constructing symbol tables. The document explains concepts like synthesized and inherited attributes in relation to parse trees.

UNIT-III
Intermediate Code Generation: Syntax Directed Definitions,
Evaluation Orders for Syntax Directed Definitions-Intermediate
Languages: Syntax Tree, Three Address Code, Types and Declarations-
Translation of Expressions, Type Checking

Syntax-Directed Definition
• Inherited and Synthesized Attributes
• Evaluating an SDD at the nodes of a parse tree

Semantic Analysis
• The third phase of the compiler called semantic analysis.
• The main goal of the semantic analysis is to check the correctness of program and
enable proper execution
• The job of the parser is only to verify that the input program consists of tokens
arranged on syntactically valid combination
• In semantic analysis we check whether they form a sensible set of instructions in
the programming language

Semantic Analysis
Definition:
• Semantic Analysis is the third phase of the compiler which acts as
an interface between syntax analysis phase and code generation
phase
• It accepts the parse tree from the syntax analysis phase and adds the
semantic information to the parse tree and performs certain checks
based on this information
• It also helps constructing the symbol table with appropriate
information

Semantic Analysis
• The semantics of a language can be described very easily using two
notations namely:
• Syntax Directed Definition (SDD)
• Syntax Directed Translation (SDT)
Note: Consider the production E  E+T . To distinguish E on LHS of
the production and E on RHS of the production, we use E1 on RHS of
the production as shown below:
E  E1 + T

Syntax Directed Definition (SDD)
Definition:
• A Syntax Directed Definition (SDD) is a context free grammar
with attributes and semantic rules.
• The attributes are associated with grammar symbols whereas the
semantic rules are associated with productions.
• The semantic rules are used to compute the attribute values.

Example
A Simple Syntax Directed Definition ( SDD) for the production E  E1 + T can be written as shown below:

Types of attributes
• There are two types of attributes:
Synthesized Attributes
Inherited Attributes
Synthesized Attributes – These are those attributes which derive their
values from their children nodes i.e. value of synthesized attribute at node is
computed from the values of attributes at children nodes in parse tree.

Example: Let us assume an input string 4 * 5 + 6 for computing synthesized
attributes. The annotated parse tree for the input string is

Contd..
2. Inherited Attributes – These are the attributes which derive
their values from their parent or sibling nodes i.e. value of
inherited attributes are computed by value of parent or sibling
nodes.

Example: Let us assume an input string int a, c for computing inherited
attributes. The annotated parse tree for the input string is

The document discusses syntax-directed translation and intermediate code generation in compiler design. It covers syntax-directed definitions, inherited and synthesized attributes, evaluating syntax-directed definitions by constructing annotated parse trees. Syntax-directed definitions associate semantic rules with productions to compute attribute values. Attributes can be synthesized, where values are passed up from children to parent, or inherited, where values are passed down from parent to children. Annotated parse trees show attribute values for each node to evaluate the syntax-directed definition.

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The document discusses syntax directed translations (SDDs) and their definitions, evaluation order, and applications in programming language processing. It details types of attributes (synthesized and inherited), the evaluation process using annotated parse trees, and introduces various forms of intermediate code representation such as syntax trees, postfix notation, and three-address code. Additionally, it covers specific classes of SDDs, syntax-directed translation schemes, and their implementation in compilers.

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The document outlines the curriculum for a Compiler Design course at Matrusri Engineering College, covering topics such as lexical analysis, parsing strategies, semantic analysis, syntax-directed translation, and code optimization. It details course objectives, outcomes, and key concepts including attributes, parse trees, and abstract syntax trees. Specific production rules and semantic actions are exemplified, illustrating the practical application of syntax-directed definitions and translations in compiler construction.

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The document discusses the principles of semantic analysis in compiler design, focusing on syntax-directed definitions (SDDs) that combine context-free grammar with attributes and rules. It describes two attribute types (inherited and synthesized), their evaluation during parsing, and the importance of dependency graphs in showing the information flow within attribute instances. Additionally, it introduces s-attributed and l-attributed syntax-directed translations, highlighting how they manage attribute values in parse trees and providing examples of annotated parse trees and dependency graphs.

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Semantic analysis is a compiler phase that adds information to the parse tree and checks for semantic errors, occurring between parsing and code generation. It can be implemented using two notations: syntax directed definitions and translation schemes, facilitating the addition of semantics to context-free grammars. Various types of syntax directed translations, such as s-attributed and l-attributed SDTs, help manage attribute evaluation based on the structure of the parse tree.

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The document discusses syntax-directed translation and semantic analysis in compiler design. It covers the following key points: - Syntax-directed translation attaches semantic rules or actions to a context-free grammar to specify meaning. This allows constructing syntax trees and evaluating attributes during parsing. - Semantic analysis checks for semantic errors like type mismatches. It uses the parse tree to identify expressions and statements. - Syntax-directed definitions and translation schemes are notations for associating semantic rules with grammar productions. - Attributes can be synthesized, computed from children, or inherited, computed from parents or siblings. Their values are evaluated in a bottom-up manner during parsing. - Syntax trees compactly represent language structures

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This document discusses semantic analysis in compilers. It begins by defining semantics and semantic analysis, and provides an example of a syntactically valid but semantically invalid statement. It then discusses how semantic rules are associated with a context-free grammar to perform semantic analysis. It describes the annotated parse tree output of semantic analysis and how semantic rules are associated with grammar productions. The document discusses different ways to represent semantic rules like syntax-directed definitions and attribute grammars. It also covers different types of attributes like synthesized and inherited attributes. Finally, it discusses applications of semantic analysis like type checking and generating intermediate code.

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This document provides an overview of syntax-directed translation and attribute grammars. It discusses: - Syntax-directed definitions associate semantic rules with production rules to evaluate attributes and perform actions like code generation. Attributes can represent various types of information. - Syntax trees can be annotated with attribute values. The order attributes are computed depends on semantic rule dependencies. - Translation schemes specify an order for evaluating semantic actions associated with productions. This provides implementation details omitted from syntax-directed definitions. - S-attributed and L-attributed definitions are subclasses that allow efficient single-pass evaluation during parsing by restricting how attributes can be used.

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This document discusses syntax-directed translation and runtime environments in compiler design. It covers syntax-directed definitions, construction of syntax trees, bottom-up evaluation of S-attributed definitions, and runtime issues like storage organization, parameter passing, and symbol tables. Syntax-directed definitions associate semantic rules with context-free grammar productions to evaluate attributes during parsing. Bottom-up evaluation uses a parser stack to hold attribute values and compute new values based on reducing productions.

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This document discusses inherited and synthesized attributes in semantic analysis using syntax-directed translation (SDT). It covers: - Synthesized attributes are defined by semantic rules associated with productions and rely only on child nodes, while inherited attributes rely on parent/sibling nodes. - Terminals can have synthesized attributes from lexing but not inherited attributes. Nonterminals can have both. - Annotated parse trees show attribute values, while dependency graphs determine evaluation order. - S-attributed definitions rely only on synthesized attributes and evaluate bottom-up. L-attributed definitions restrict inherited attributes to avoid cycles. - SDTs can construct syntax trees during parsing to decouple parsing from translation

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When we associate semantic rules with productions, we use two notations: Syntax-Directed Definitions Translation Schemes Syntax-Directed Definitions: give high-level specifications for translations hide many implementation details such as order of evaluation of semantic actions. We associate a production rule with a set of semantic actions, and we do not say when they will be evaluated. Translation Schemes: indicate the order of evaluation of semantic actions associated with a production rule. In other words, translation schemes give a little bit information about implementation details.

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This document discusses syntax-directed translation, which refers to a method of compiler implementation where the source language translation is completely driven by the parser. The parsing process and parse trees are used to direct semantic analysis and translation of the source program. Attributes and semantic rules are associated with the grammar symbols and productions to control semantic analysis and translation. There are two main representations of semantic rules: syntax-directed definitions and syntax-directed translation schemes. Syntax-directed translation schemes embed program fragments called semantic actions within production bodies and are more efficient than syntax-directed definitions as they indicate the order of evaluation of semantic actions. Attribute grammars can be used to represent syntax-directed translations.

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The document discusses semantic analysis in compiler design. It begins by introducing semantic analysis and its goals of ensuring a program has well-defined meaning and checking properties that aren't caught in earlier parsing phases, like variable declarations and type consistency. It then discusses implementing semantic analysis using an annotated abstract syntax tree and syntax-directed definitions. These attach attributes and semantic rules to symbols and productions in a context-free grammar. The document provides examples of simple semantic rules and building an attributed parse tree. It also discusses different types of attributes and syntax-directed translation schemes. Finally, it covers type checking as a key part of semantic analysis.

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This document summarizes semantic analysis in compiler design. Semantic analysis computes additional meaning from a program by adding information to the symbol table and performing type checking. Syntax directed translations relate a program's meaning to its syntactic structure using attribute grammars. Attribute grammars assign attributes to grammar symbols and compute attribute values using semantic rules associated with grammar productions. Semantic rules are evaluated in a bottom-up manner on the parse tree to perform tasks like code generation and semantic checking.

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A syntax-directed definition (SDD) is a context-free grammar with attributes and semantic rules. Attributes are associated with grammar symbols and rules are associated with productions. An SDD can be evaluated on a parse tree to compute attribute values at each node. There are two types of attributes: synthesized attributes depend on child nodes, while inherited attributes depend on parent or sibling nodes. The order of evaluation is determined by a dependency graph showing the flow of information between attribute instances.

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This document presents an in-depth overview of syntax-directed translation, focusing on its definitions, types, and applications within compiler construction. Key topics include the significance of semantic analysis, various evaluation methods, and the implementation of syntax-directed definitions and translation schemes in parsing processes. Practical examples and exercises are provided to illustrate concepts such as inherited and synthesized attributes, evaluation orders, and the transformation of definitions to translation schemes.

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Sure! Here's a **full solution** for your question based on the grammar of arithmetic expressions with addition and multiplication. --- ### 📘 **Given Grammar:** ``` E → E + T E → T T → T * F T → F F → digit ``` --- ## ✅ (a) Synthesized Attributes and Semantic Rules We define a **synthesized attribute** `val` to represent the **numeric value** of each non-terminal. The `digit.lexval` holds the integer value of the digit token. ### 🎯 Semantic Rules: ``` E → E1 + T { E.val = E1.val + T.val } E → T { E.val = T.val } T → T1 * F { T.val = T1.val * F.val } T → F { T.val = F.val } F → digit { F.val = digit.lexval } ``` --- ## ✅ (b) Evaluate Expression: `2 + 3 * 4` ### 🔹 Operator Precedence - According to grammar: - `*` has **higher precedence** than `+` - So: `2 + (3 * 4) = 2 + 12 = 14` --- ### 🔢 Step-by-step Attribute Evaluation: 1. `digit(2)` → `F.val = 2` → `T.val = 2` → È1.val = 2` 2. `digit(3)` → `F.val = 3` 3. `digit(4)` → `F.val = 4` → `T1.val = 3`, `F.val = 4` → `T.val = 3 * 4 = 12` 4. È.val = E1.val + T.val = 2 + 12 = 14` ✅ Final Result: È.val = 14` --- ## ✅ (c) Annotated Parse Tree (with Synthesized Attributes) ``` E (14) / | \ E(2) + T(12) | | T(2) T(12) | | F(2) T(3) * F(4) | | F(3) F(4) ``` ### 🔹 Attribute Flow: | Symbol | Value | |------------|--------| | F(2) | 2 | | T(2) | 2 | | E1 | 2 | | F(3) | 3 | | F(4) | 4 | | T(3 * 4) | 12 | | E(2 + 12) | 14 | --- Let me know if you’d like this in **PowerPoint** or **PDF** format or want a **tree diagram image** of the parse tree!

lect-05.pdfKamranAli649587

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Syntax-directed translation associates grammar symbols with attributes to represent programming language constructs. Semantic rules associated with production rules evaluate attributes by generating code, updating symbol tables, and performing type checking and error reporting. Syntax-directed definitions specify translations at a high level, while translation schemes indicate the order semantic actions are evaluated. Annotated parse trees show attribute values computed at each node during translation.

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Chapter 5 discusses syntax-directed translation, focusing on syntax-directed definitions (SDDs), evaluation orders, and their applications. It explains how attributes are associated with grammar symbols, detailing synthesized and inherited attributes, and illustrates evaluation through dependency graphs. Additionally, it covers syntax-directed translation schemes, including postfix and actions within productions, providing examples and methods for their implementation.

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The document discusses compiler design, focusing on syntax-directed translation (SDT) and intermediate-code generation. It covers topics such as syntax-directed definitions, evaluation orders, intermediate representations, and three-address codes. Additionally, the document elaborates on semantic rules, types, attributes, and various implementation strategies related to SDT and intermediate code generation.

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Syntax directed translation allows semantic information to be associated with a formal language by attaching attributes to grammar symbols and defining semantic rules. There are several types of attributes including synthesized and inherited. Syntax directed definitions specify attribute values using semantic rules associated with grammar productions. Evaluation of attributes requires determining an order such as a topological sort of a dependency graph. Syntax directed translation schemes embed program fragments called semantic actions within grammar productions. Actions can be placed inside or at the ends of productions. Various parsing strategies like bottom-up can be used to execute the actions at appropriate times during parsing.

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Syntax-directed translation refers to a method of compiler implementation where the source language translation is completely driven by the parser. There are two main notations used - syntax-directed definitions and translation schemes. Syntax-directed definitions specify semantic rules associated with production rules and hide implementation details, while translation schemes provide more details about the order of evaluation. S-attributed definitions use only synthesized attributes and allow bottom-up evaluation of semantic rules during parsing using a stack to hold attribute values.

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This comprehensive PowerPoint presentation is prepared for B.Sc Nursing 5th Semester students and covers Unit 2 of Community Health Nursing – I based on the Indian Nursing Council (INC) syllabus. The unit focuses on the planning, structure, and functioning of health care services at various levels in India. It is especially useful for nursing educators and students preparing for university exams, internal assessments, or professional teaching assignments. The content of this presentation includes: Historical development of health planning in India Detailed study of various health committees: Bhore, Mudaliar, Kartar Singh, Shrivastava Committee, etc. Overview of major health commissions In-depth understanding of Five-Year Plans and their impact on health care Community participation and stakeholder involvement in health care planning Structure of health care delivery system at central, state, district, and peripheral levels Concepts and implementation of Primary Health Care (PHC) and Sustainable Development Goals (SDGs) Introduction to Comprehensive Primary Health Care (CPHC) and Health and Wellness Centers (HWCs) Expanded role of Mid-Level Health Providers (MLHPs) and Community Health Providers (CHPs) Explanation of national health policies: NHP 1983, 2002, and 2017 Key national missions and schemes including: National Health Mission (NHM) National Rural Health Mission (NRHM) National Urban Health Mission (NUHM) Ayushman Bharat – Pradhan Mantri Jan Arogya Yojana (PM-JAY) Universal Health Coverage (UHC) and India’s commitment to equitable health care This presentation is ideal for: Nursing students (B.Sc, GNM, Post Basic) Nursing tutors and faculty Health educators Competitive exam aspirants in nursing and public health It is organized in a clear, point-wise format with relevant terminologies and a focus on applied knowledge. The slides can also be used for community health demonstrations, teaching sessions, and revision guides.

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LDM Recording Presents Yogi Goddess by LDMMIALDM & Mia eStudios

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A bonus dept update. Happy Summer 25 almost. Do Welcome or Welcome back. Our 10th Free workshop will be released the end of this week, June 20th Weekend. All Materials/updates/Workshops are timeless for future students. 6/17/25: “My now Grads, You’re doing well. I applaud your efforts to continue. We all are shifting to new paradigm realities. Its rough, there’s good and bad days/weeks. However, Reiki with Yoga assistance, does work.” 6/18/25: "For those planning the Training Program Do Welcome. Happy Summer 2k25. You are not ignored and much appreciated. Our updates are ongoing and weekly since Spring. I Hope you Enjoy the Practitioner Grad Level. There's more to come. We will also be wrapping up Level One. So I can work on Levels 2 topics. Please see documents for any news updates. Also visit our websites. Every decade I release a Campus eMap. I will work on that for summer 25. We have 2 old libraries online thats open. https://ldmchapels.weebly.com " A Safe House, sanctuary of virtual relaxation and rejuvenation. By ©YogiGoddess of ©LDMMIA, ©LDMYoga. ♥Teacher Dept: (Rev Dr) Leslie Moore, ND Yoga (Aide/LPN Trained), Metaphysician, Using Reiki Practitioner/Master Level Trained. #yogigoddess @YogiGoddessVEVO ♥LDMMIA & Depts: are fusing the fan clubs so do welcome. We are timeless and a safe haven / Cyber Space. That’s the design of our Fan/Reader/Loyal Blog.♥ LDM HQ Est. in Ann Arbor, MI 2005. - Moved to Detroit in 2006, - Expanded online 2007-2024+ - Became a Beatz Studio in 2009 as Yogi Goddess. After our Apple Podcast - Relocated to Mount Pleasant MI for College The Pandemic Ending. - Endemic - Present; Moved back to assist Family in Metro Detroit. Practitioner Student. Level/Session 2 * The Review & Topics: * All virtual, adult, education students must be over 18 years to attend LDMMIA eClasses and vStudio Thx. * Please refer to our Free Workshops anytime for review/notes. *Tech: Products Sold Separately are for Uploading Size Reasons, THX. MIA TECH: Videos under Copyright including our Music Video for Yogi Goddess, Can only be picked up vs shop downloaded. We are under vydia.com Pickup will be our Youtube, for unlisted Playlist. We do have another Vod for Session 2, Level 1. After that we move on to Session 3. Levels 1-3 should be done by August to Sept. LDM Recording, Yogi Goddess Bio (ReverbNation) Organization functions as a Studio 1st. We are a Media Co, Private Sector, and Global Listed. Imagine we are 2 different studios. One for Yoga, the Other for Music Beatz. We are also Vevo TV for Smart TV and Youtube, 2 platforms. The audience differs. Our Biz income are Media monetization within The Entertainment genre. This includes the category of Yoga, Reiki, ASMR, and Music Beatz. Any other tips, donations, B2C sales/Student Tuition are extra. The Biz gifts are appreciated. (We have been given a few $K for random emergencies.)

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unit 3 modules intermediate code generation

1. UNIT-III Intermediate Code Generation: Syntax Directed Definitions, Evaluation Orders for Syntax Directed Definitions-Intermediate Languages: Syntax Tree, Three Address Code, Types and Declarations- Translation of Expressions, Type Checking

2. Syntax-Directed Definition • Inherited and Synthesized Attributes • Evaluating an SDD at the nodes of a parse tree

3. Semantic Analysis • The third phase of the compiler called semantic analysis. • The main goal of the semantic analysis is to check the correctness of program and enable proper execution • The job of the parser is only to verify that the input program consists of tokens arranged on syntactically valid combination • In semantic analysis we check whether they form a sensible set of instructions in the programming language

4. Semantic Analysis Definition: • Semantic Analysis is the third phase of the compiler which acts as an interface between syntax analysis phase and code generation phase • It accepts the parse tree from the syntax analysis phase and adds the semantic information to the parse tree and performs certain checks based on this information • It also helps constructing the symbol table with appropriate information

5. Semantic Analysis • The semantics of a language can be described very easily using two notations namely: • Syntax Directed Definition (SDD) • Syntax Directed Translation (SDT) Note: Consider the production E  E+T . To distinguish E on LHS of the production and E on RHS of the production, we use E1 on RHS of the production as shown below: E  E1 + T

6. Syntax Directed Definition (SDD) Definition: • A Syntax Directed Definition (SDD) is a context free grammar with attributes and semantic rules. • The attributes are associated with grammar symbols whereas the semantic rules are associated with productions. • The semantic rules are used to compute the attribute values.

7. Example A Simple Syntax Directed Definition ( SDD) for the production E  E1 + T can be written as shown below:

8. Types of attributes • There are two types of attributes: Synthesized Attributes Inherited Attributes Synthesized Attributes – These are those attributes which derive their values from their children nodes i.e. value of synthesized attribute at node is computed from the values of attributes at children nodes in parse tree.

9. Example: Let us assume an input string 4 * 5 + 6 for computing synthesized attributes. The annotated parse tree for the input string is

10. Contd.. 2. Inherited Attributes – These are the attributes which derive their values from their parent or sibling nodes i.e. value of inherited attributes are computed by value of parent or sibling nodes.

11. Example: Let us assume an input string int a, c for computing inherited attributes. The annotated parse tree for the input string is

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unit 3 modules intermediate code generation

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