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Subjects All categories General Aptitude 2. Follow gateoverflow. Suestions Overflow. Recent Blog Comments Was never thinking about subscribing for this Congratulations :. Network Sites GO Mechanical. GO Electrical. Srt Electronics. GO Xdt. CSE Doubts. Compiler sdt questions in compiler design online free question on SDT : 1.
How the value is with Top down Parser? Please log onlkne or register to add a comment. Please log in or register to answer this question. Can u plz explain this question here we have no semantic actions defined for printing 1 or 3so then how are we actually doing thisunable to get the question.
The answer is The answer given above is not right. Leen can you tell me the difference between bottom up and top down,best if u can draw a diagram for top down and tell me the approach to do the top down approach.
In my opnion the input string is not parsed successfully. Based on the bottom up we are parsing the string from leaves to root but it is not successfully here. Please suggest me if i am wrong. For lnline down approach answer is why because we write the productions along with parse tree and carry out that action when we encounter one but in case of bottom up approach we totally focus on reduction, knline ever we encounter any reduction we go to production and carry out that action so sdt questions in compiler design online free to that BUP gives me as answer.
Next Qn. Related questions. Do L attributed SDT needs to have both synthesized attributes and inherited attributes? Dark theme.
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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. Not all SDT's can be implemented during parsing, as we shall see in the next example.
Example: As an extreme example of a problematic SDT, suppose that we turn our desk-calculator running example into Sdt Questions In Compiler Design Example an SDT that prints the prefix form of an expression, rather than evaluating the expression. The productions and actions are shown in Fig. Figure 5. Using marker nonterminals M2 and M4 for the actions in productions 2 and 4, respectively, on input 3, a shift-reduce parser see Section 4.
Ignoring the actions, parse the input and produce a parse tree as a result. It takes all the tokens one by one and uses Context Free Grammar to construct the parse tree. It furthermore produces a verified parse tree. Intermediate Code Generator : It generates intermediate code, that is a form which can be readily executed by machine We have many popular intermediate codes.
Code Optimizer : It transforms the code so that it consumes fewer resources and produces more speed. Target Code Generator : The main purpose of Target Code generator is to write a code that the machine can understand. The output is dependent on the type of assembler. Error handling : The tasks of the Error Handling process are to detect each error, report it to the user, and then make some recover strategy and implement them to handle error.
An Error is the blank entries in the symbol table. There are two types of error : Run-Time Error : A run-time error is an error which takes place during the execution of a program, and usually happens because of adverse system parameters or invalid input data.
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