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22.04.2021, adminSee Last Minute Notes on all subjects here. It helps the compiler to function smoothly by finding the identifiers quickly. Lexical Analysis : Lexical analyzer reads a source program character by character to produce tokens.
Tokens can be identifiers, keywords, operators, separators etc. Syntax Analysis : Syntax analyzer is also known as parser. It constructs the parse tree. 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.
Compile-Time Error : Compile-time errors rises at compile time, before execution of the program. Lexical : This includes misspellings of identifiers, keywords or operators.
Syntactical : missing semicolon or unbalanced parenthesis. Semantical : incompatible value assignment or type mismatches between operator and operand. Logical : code not reachable, infinite loop. Top down parsing techniques cannot handle left recursive grammar so we convert left recursion into right recursion. Left Factoring : If a grammar has common prefixes in r. LL 1 Parser : LL 1 grammar is unambiguous, left factored and non left recursive.
To check whether a grammar is LL 1 or not : 1. Conflicts in LR 0 parser : 1. Conflicts in SLR 1. Skip to content. We use cookies to ensure you have the best browsing experience on our website.
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