LOGIC:
Building SLR Parse Tables The easiest technique for generating LR-based parse table is known as SLR (Simple LR). Understanding this technique should provide you with what you need to know to understand how LR parsers work in general; it is also the foundation for the more complex techniques (LR and LALR). Table will have fewer rows than LR. The LR table for a typical programming language may have several thousand rows, which can be merged into just a few hundred for LALR. Due to merging, the LALR(1) table seems more similar to the SLR(1) and LR(0) tables, all three have the same number of states (rows), but the LALR may have fewer. Write a C program for implementing the functionalities of predictive parser for the mini language. C program with output. Is the predictive parsing table for the. Rules to Build LL(1) Parsing Table. To construct LL(1) Parsing Table, we must have knowledge of FIRST and FOLLOW of a grammar. For all terminal in insert to; If contains ‘Є’, then for all terminal in add to; LL(1) Parsing Table Program in C. The program reads grammar from a file “text.txt”. “^” is used to represent epsilon. The program assumes that the input grammar is LL(1). – Bottom -up parsing is also known as shift reduce parsing. – Operator-Precedence Parsing –simple, restrictive, easy to implement – LR Parsing –much general form of shift-reduce parsing, LR, SLR, LALR Semantic Analyzer A semantic analyzer checks the source program for.
Read the input string.
Using predictive parsing table parse the given input using stack .
If stack [i] matches with token input string pop the token else shift it repeat the process until it reaches to $.
RESOURCE:
Turbo C++
| INPUT & OUTPUT: | |
| Enter the input string:i*i+i | |
| Stack | INPUT |
| $bt | i*i+i$ |
| $bcf | i*i+i$ |
| $bci | i*i+i$ |
| $bc | *i+i$ |
| $bcf* | *i+i$ |
| $bcf | i+i$ |
| $bci | i+i$ |
| $bc | +i$ |
| $b | +i$ |
| $bt+ | +i$ |
| $bt | i$ |
| $bcf | i$ |
| $ bci | i$ |
| $bc | $ |
| $b | $ |
| $ | $ |
| success |
A compiler is a program that translates the code that is written in one language to a machine code without changing the logic of the program. The compiler also tries to make the program more efficient.
Compiler design principles give a detailed view of the translation and optimization process of a program. Compiler design covers everything from basic translation mechanism to recovery and error detection. It includes various methods like lexical, syntax, and semantic analysis as front end, and code generation and optimization as back-end.
In this post, we will write the program to generate an SLR parse table from CFG grammar.
We will use C++ to write this program due to the standard template library support. Although, it’s very similar to C.
Sample Program In C Language
Input
Output
Program
Input Parsing C
Let us know in the comments if you are having any questions regarding this compiler design program.
Sample Program In C++ Programming
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