Posted inCompiler Design
Finite Automata
Finite automata is a state machine that takes a string of symbols as input and changes its state accordingly. Finite automata is a recognizer for regular expressions. When a regular…
Posted inCompiler Design
RECOGNITION OF TOKENS
Consider the following grammar fragment: stmt → if expr then stmt | if expr then stmt else stmt | ε expr → term relop term | term term →…
Posted inCompiler Design
SPECIFICATION OF TOKENS
There are 3 specifications of tokens: 1)Strings 2) Language 3)Regular expression Strings and Languages · An alphabet or character class is a finite set of symbols. · A string over an alphabet is a finite sequence of…
Posted inCompiler Design
Tokens
Lexemes are said to be a sequence of characters (alphanumeric) in a token. There are some predefined rules for every lexeme to be identified as a valid token. These rules…
Posted inCompiler Design
Input Buffering in Compiler Design
The lexical analyzer scans the input from left to right one character at a time. It uses two pointers begin ptr(bp) and forward to keep track of the pointer of…
Posted inCompiler Design
Roles of the Lexical analyzer
Lexical analyzer performs below given tasks: Helps to identify token into the symbol table Removes white spaces and comments from the source program Correlates error messages with the source program…
Posted inCompiler Design
Architecture
A compiler can broadly be divided into two phases based on the way they compile. Analysis Phase Known as the front-end of the compiler, the analysis phase of the compiler reads the…
Posted inCompiler Design
Lexical Analysis
Lexical analysis is the first phase of a compiler. It takes the modified source code from language preprocessors that are written in the form of sentences. The lexical analyzer breaks…
Posted inCompiler Design
Phases of Compiler
The compilation process is a sequence of various phases. Each phase takes input from its previous stage, has its own representation of source program, and feeds its output to the…
Posted inCloud Computing
Enterprise Cloud Computing
Enterprise Cloud Computing refers to a computing environment residing behind a firewall that delivers software, infrastructure and platform services to an enterprise. Cloud computing also typically delivers Web services, providing access…