What is the purpose of the lexical analyzer?
The lexical analyzer (generated automatically by a tool like lex, or hand-crafted) reads in a stream of characters, identifies the lexemes in the stream, and categorizes them into tokens. This is termed tokenizing. If the lexer finds an invalid token, it will report an error.
What is the objective of intermediate code generation?
Intermediate code eliminates the need of a new full compiler for every unique machine by keeping the analysis portion same for all the compilers. The second part of compiler, synthesis, is changed according to the target machine.
How is type checking done?
Static and Dynamic Checking of Types Checking done by a compiler is said to be static, while checking done when the target program runs is termed dynamic. Any check can be done dynamically, if the target code carries the type of an element along with the value of that element.
What is parsing and role of lexical analyzer?
Upon receiving a get-next-tohen command from the parser, the lexical analyzer reads input characters until it can identify the next token. the tokens influence parsing decisions, the attributes influence the translation of tokens.
What is meant by intermediate code?
What is intermediate code? Ans: During the translation of a source program into the object code for a target machine, a compiler may generate a middle-level language code, which is known as intermediate code or intermediate text. The complexity of this code lies between the source language code and the object code.
Why is intermediate code needed?
After semantic Analysis, the code is converted into intermediate code which is platform (OS + hardware) independent. Hence, one of the purposes of using intermediate code in compilers is to increase the chance of reusing the machine-independent code optimizer in other compilers.
What is the importance of type checking?
In a statically typed language, every expression of the language is assigned a type at compile time. If the type system can ensure that the value of each expression has a type compatible with the type of the expression, then type checking of most operations can be moved to compile time.