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Compiler Design - Semantic Analysis - Tutorialspoint
SDT Implementation Using Parse Tree (in Hindi). mins. 4. Intermediate Code Generation, Syntax Tree (in Hindi). mins. 5. Three Address Code, Quadruples and Triples (in Hindi). mins. 6. Synthesized & Inherited Attributes, S- Attributed & L- Attributed SDT (in Hindi). mins. 7. SDT Solved Example. mins. 8.� Revise Everything in 15 Minutes - SDT (in Hindi). mins. � Sorting Hat Technologies Pvt Ltd. Introduction of Object Code in Compiler Design. Data flow analysis in Compiler. CD MCQexpand_more.� This is possible only because SDT rules don�t impose any specific order on evaluation until children attributes are computed before parents for a grammar having all synthesized attributes. Otherwise, we would have to figure out the best suited plan to traverse through the parse tree and evaluate all the attributes in one or more traversals. (2) In compilers generation of intermediate code based on an abstract machine model is useful because. (A) Syntax-directed translations can be written for intermediate code generation (B) To generate code for real machines directly from high-level language programs is not possible (C) Portability of the front end of the compiler is enhanced (D) Implementation of lexical and syntax analysis is easier. View Answer / Hide Answer.

Explanation: Users write the program in a high-level language because it is easier to use, understand and remember. Explanation: Compiler is a computer program that accepts the code written in a high-level language and converts that code into the assembly language.

Explanation: The compiler is that program which translates the whole high-level code into the machine code at once. Explanation: The object file contains the object code, which is an output of an assembler. Explanation: Scanner is a subroutine which is called by the compiler program. The scanner combines the characters and implements them to produce tokens. Explanation: Linker is a program in the compiler which is required to create a load module.

Explanation: In the compiler design, the parser is mainly categorized into top-down parsing and bottom-up parsing. Explanation: Top-down parsing is a technique which constructs the parse tree from the start symbol and transforms it to the input symbol. This type of parsing is also referred to as predictive or recursive parsing.

Explanation: Top-down parser generates the left-most derivation. It constructs the parse tree from left to right and constructs the left-most derivation of the specified sentence. Explanation: Bottom-up parser generates the right-most derivation in reverse. It constructs the parse tree from the input string to the root and tries to construct the right-most derivation of the specified string backward.

Explanation: Lexical analyzer gives the set of tokens as output. The set of tokens contains keywords, separators, literals, identifiers, and operators. Explanation: Lexical grammar is a type of grammar which specifies the syntax of tokens. Explanation: Ambiguous grammar is a context-free grammar which gives more than one leftmost or rightmost derivation for the same specified sentence. Explanation: Lexical analyzer is used in the compiler for removing the Whitespace and comments.

It is also used in breaking the syntaxes into the set of tokens. Explanation: Lexemes are the string of alphanumeric characters in a single token. In the source program, lexemes are characters which are identified by the pattern for a token. Explanation: The concept of grammar is much used in the parser phase of the compiler.

The parser phase is next to the lexical analysis phase in the compiler. Parser generated the parse tree using the predefined grammar. The parser has two different techniques for creating a different parse tree. Explanation: Syntax Analysis is the 2nd phase of the compiler, which checks the given input string is the correct syntax of the programming language.

Explanation: In the semantic analysis, Sdt Questions In Compiler Design 6th type checking is an important component because it verifies Sdt Questions In Compiler Design Tutorial the program's operations from the semantic conventions. Explanation: The first part of the compiler lexical analysis is also known as a scanner. It scans the characters from the source program and implements them to produce tokens. Explanation: The phase of the compiler next to the lexical analysis phase is also known as Parser. Syntax analysis or parser accepts the tokens produced by the lexical analysis and gives the parse tree in the output.

Explanation: Recursive descent parser is a type of top-down parser which generates the parse tree from top to bottom and reads the input string from left to right. Explanation: Keywords are firstly recognized during the lexical analysis of the program in the compiler. Explanation: All the leaf nodes in the parse tree indicate the terminals. And all the interior nodes indicate non-terminals. Explanation: A flow graph is a graph of the compiler which describes the basic blocks and how the program control is passed between the blocks.

Explanation: According to the Chomsky hierarchy, push down automata accepts the Type 2 language, which is used for context-free language.

Explanation: Context-sensitive grammar is the most general phase of structured grammar because, in this grammar, the left-hand side and the right side contain the terminals or non-terminals. Answer: d. Explanation: After semantic analysis, the intermediate code increases the chances of reusing the machine-independent code optimizer in other compilers. Explanation: The code optimization technique is divided into machine-dependent and machine-independent types. Explanation: The value of the induction variable is updated inside the loop by a loop-invariant value.

Explanation: Cross compiler is a compiler which runs on one machine and generates code for more than one machine. Explanation: The compiler does not take more time to execute.

So, more execution time is not a characteristic of the compiler. Explanation: Left recursion is the process in which non-terminal on the left side of the production is the same on the right side as the leftmost symbol. Explanation: The rightmost derivation is that derivation of context-free grammar, which replaces the rightmost non-terminal symbol at each step. Explanation: The leftmost derivation is that derivation of context-free grammar which replaces the leftmost non-terminal symbol at each step.

Explanation: Compiler is a computer program that detects grammatical errors, not logical errors. Explanation: Context-free grammar is that grammar which consists of the start symbol, set of terminals, set of non-terminal symbols and the set of productions.

Explanation: Loop fusion is an optimization technique which merges the multiple bodies of loops into a single body. This programming technique may reduce the runtime performance of the program.

Explanation: Bottom-up parser in the compiler is also called the shift-reduce parser. Explanation: The tree which represents the syntactic structure of the string is known as the parse tree. It also indicates the terminal, start symbol, and non-terminal symbols.

Explanation: A right linear grammar is that grammar which contains all the non-terminals on the right-hand side at the right ends. This grammar can be simply converted into the DFA. Explanation: Code generation algorithm invokes the GETREG function to check the status of available registers and the location where the result should be stored.

This function also selects the registers for every memory location. Explanation: Context-sensitive languages are those languages which are defined by context-sensitive grammar. Explanation: The peephole optimization technique is used to reduce the memory footprint and the size of code.

It is also used to improve the program performance. Explanation: The address descriptor is a descriptor of the code generator technique, which keeps track of the memory location. Explanation: In the compiler, interior nodes are specified by the operator symbol. Explanation: DAG is a Directed Acyclic Graph, which is constructed using three address code for optimizing the basic blocks. Explanation: A symbol table is simply a table which is created and maintained by the compiler and used in various phases of the compiler.

Explanation: Quadruples are a record structure in a compiler with four fields for implementing the three address code. Explanation: Syntax tree is a tree in the compiler which represents operands by leaf and operator by interior nodes. Explanation: Input-Output is a mapping which is described by the implementation of the syntax-directed translator SDT. And, it is called the canonical collection of LR 0 item. Explanation: The shift-reduce parser contains only shift, reduce, error and accept action.

That's why Go is not a function of the shift-reduce parser. Explanation: Operator grammar is the grammar that does not contain two adjacent non-terminals on the right side of the production. It is that grammar that defines the mathematical operators.

It is also known as Deterministic Finite Acceptor. The automata read only one symbol from the input string at a time. It is also known as a Non-Deterministic Finite State-machine. An Automaton gives more than one possible transition of the same state. JavaTpoint offers too many high quality services. Mail us on hr javatpoint. Please mail your requirement at hr javatpoint. Duration: 1 week to 2 week. Compiler Tutorial. Answer: b. High-Level Language Explanation: Users write the program in a high-level language because it is easier to use, understand and remember.

Compiler Explanation: Compiler is a computer program that accepts the code written in a high-level language and converts that code into the assembly language. Yes Explanation: The compiler is that program which translates the whole high-level code into the machine code at once. Object File Explanation: The object file contains the object code, which is an output of an assembler.

Scanner Explanation: Scanner is a subroutine which is called by the compiler program. It is required to create the load module.

Answer: c. Top-Down Parsing Explanation: Top-down parsing is a technique which constructs the parse tree from the start symbol and transforms it to the input symbol. Left-most derivation Explanation: Top-down parser generates the left-most derivation. Answer: a. Right-most derivation in reverse. Lexical Grammar Explanation: Lexical grammar is a type of grammar which specifies the syntax of tokens. Ambiguous Explanation: Ambiguous grammar is a context-free grammar which gives more than one leftmost or rightmost derivation for the same specified sentence.

All of the mentioned Explanation: Lexical analyzer is used in the compiler for removing the Whitespace and comments.

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