Compiler

Translates one High-Level Language into a Low-Level Language Compiling does 2 things:

1. Checks the code if it follows the rules of C++, checking syntax and possible memory leaks.
2. Turns code into AST
3. Optimizes code
4. Converts to a lower-level IR
5. It is the responsibility of an external tool (CPU, another interpreter, etc) to either convert the IR into an object file or interpret it.

After the compiler, we optionally pass the program to a Linker

Compiler Types

• Ahead-of-time Compilation
• JIT Compilation
• Transpilers

The As-If Rule redteam

The compiler can modify a program any way it likes to produce more optimized code, so long as the modifications do not affect the program’s observable behavior. There is such thing as an https://www.awelm.com/posts/evil-compiler evil compiler

Example optimizations

• 3+4 → 7 every time. we dont need to calculate every compile.
• Replacing constant values with literals