Compiler design engineering notes

What are the 4 types of compilers?
Below, these topics are important to understand before building a compiler.
1. Code Generation and Optimization:
2. Modeling in Compiler Design and Implementation
3. Parsing (Recognition) Algorithms:
4. Syntax Directed Translation:
5. Generator grammars and semantic actions：
6. Optimizing Code:
7. Role of testing:
What is compiler design notes?
Types of Compiler
Cross Compilers.
They produce an executable machine code for a platform but, this platform is not the one on which the compiler is running.Bootstrap Compilers.
These compilers are written in a programming language that they have to compile.Source to source/transcompiler. Decompiler..
Compiler: A program that reads a program written in one language (the source program) and translates it into an equivalent program in another language (the target program) Important part of this translation process: the compiler reports to its user the presence of. errors in the source program.
COMPILER.

What are the 4 types of compilers?