Understanding the Phases of a Compiler

📚 The video discusses the different phases of the compiler.

💻 The preprocessor converts high-level language code into pure high-level language code by embedding required header files and omitting preprocessor directives.

🔍 The lexical analysis phase uses a lexical analyzer to generate tokens from an expression.

🔑 The lexical analysis phase converts an arithmetic expression into a stream of tokens by assigning meanings to lexemes.

🔍 The lexical analyzer recognizes tokens using regular expressions and rejects identifier names that start with digits.

🌳 The syntax analysis phase uses context-free grammars to form a parse tree based on production rules.

🌳 The video discusses the different phases of a compiler.

📜 The video explains the production rules for identifiers, expressions, terms, and factors.

✨ The video demonstrates how to derive the yield of a parse tree using top-down, left-to-right traversal.

🔍 The syntax analyzer analyzes a stream of tokens and produces a parse tree, checking for syntax errors.

🔬 The semantic analyzer verifies the parse tree for type checking, array bound checking, and scope resolution.

💻 The intermediate code generator produces intermediate code from the semantically verified parse tree.

📝 The compiler goes through different phases, starting with the front end where it generates three address code as intermediate representation.

🔎 In the code optimization phase, the code optimizer reduces the length of the code by optimizing the intermediate code.

💻 The target code generator takes the optimized code and produces the final assembly code segment.

🔑 The code segment involves moving values between registers, such as eax and edx, and performing arithmetic operations.

🔄 The pointer d word ptr rbp is used to access variables b, c, and a in the code segment.

🔢 By the end of the code segment, the calculated value is stored in variable x.

📚 The compiler consists of six phases, including lexical analysis (implemented with Lex) and syntax analysis (implemented with Yacc).

💻 The first four phases are known as the front end, and the last two phases are called the back end.

🔗 The software platform Lance C Compiler can be used to implement the front end of a C language compiler for embedded processors.