Intermediate code is between the high-level and machine level language. It represents a program for some abstract machine. Intermediate Code Generation: Once the semantic analysis phase is over, the compiler generates intermediate code for the target machine. Semantic Analyzer will check for Type mismatches, incompatible operands, a function called with improper arguments, an undeclared variable, etc.ġ5. It uses the syntax tree of the previous phase along with the symbol table to verify that the given source code is semantically consistent.
Semantic Analysis: It checks the semantic consistency of the code. These symbols (terminals or non-terminals) represent the derivation of the grammar to yield input stringsġ4. Parse Tree: It is the hierarchical representation of terminals or non-terminals. It reports all syntax errors and construct a hierarchical structure which is called as parse tree.ġ3. Syntax Analysis: Syntax analyser obtains tokens from lexical analyser and checks if the expression is syntactically correct or not.
Compiler design notes series#
The output of Lexical Analysis Phase: The output of Lexical Analyzer serves as an input to Syntax Analyzer as a sequence of tokens and not the series of lexemes because during the syntax analysis phase individual unit is not vital but the category or class to which this lexeme belongs is considerable.ġ2. The information is collected by the analysis phases of the compiler and is used by the synthesis phases of the compiler to generate code.ġ1. It is built-in lexical and syntax analysis phases. it stores information about the scope and binding information about names, information about instances of various entities such as variable and function names, classes, objects, etc. Symbol Table: It is an important data structure created and maintained by the compiler in order to keep track of semantics of variables i.e. It makes the entry of the corresponding tickets into the symbol table and passes that token to next phase.ġ0. Here, the character stream from the source program is grouped in meaningful sequences by identifying the tokens. Lexical Analysis: Lexical Analysis is the first phase when compiler scans the source code. There are 6 phases of Compiler Design:- 1)Lexical Analysis, ii)Syntax Analysis, iii)Semantic Analysis, iv)Intermediate Code Generation, v)Code Optimization, vi)Code Generation.ĩ.
Assembler translates entire program before running while interpreter translates program instructions line by line.one instruction translates to many instruction. one instruction translates to only one instruction whereas interpreter is one to many i.e. Assembler converts low-level language to the machine language while interpreter converts high-level language to the machine language.Difference between Assembler and Interpreter: Compiler converts the source code into object code while interpreter does not.ħ.As the compiler scans the code in one go, the errors (if any) are shown at the end together while in the interpreter, errors are shown line by line.Compiler scans the whole program in one go while the interpreter translates program one statement at a time.Difference between Compiler and Interpreter: Examples of interpreted languages are Perl, Python, and MatlabĦ. Interpreter: An interpreter is a computer program that directly executes instructions written in a programming or scripting language, without requiring them previously to have been compiled into a machine language program. Examples of assemblers are GAS, GNU, etc.ĥ. The output of an assembler is called an object file, which contains a combination of machine instructions as well as the data required to place these instructions in memory. Assembler: An assembler translates assembly language programs into machine code. Example: Languages that use compilers are C, C++, C#, JavaĤ. Compiler: Compiler is a translator that converts the high-level language into the machine language. When you define a macro, you provide text (usually assembly code) that you want to associate with a macro nameģ. Macro Processor: A macro processor enables you to define and use macros in your assembly programs. You can record or build a macro and then run it to automatically repeat that series of steps or actions.Ģ. It is a series of commands and actions that can be stored and run whenever you need to perform the task. Macro: A macro is used to automate a task that you perform repeatedly or regularly.
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