- Dec 2023
-
mathspp.com mathspp.com
-
Recap
In this article you started implementing your own version of Python. To do so, you needed to create four main components:
A tokenizer: * accepts strings as input (supposedly, source code); * chunks the input into atomic pieces called tokens; * produces tokens regardless of their sequence making sense or not.
A parser: * accepts tokens as input; * consumes the tokens one at a time, while making sense they come in an order that makes sense; * produces a tree that represents the syntax of the original code.
A compiler: * accepts a tree as input; * traverses the tree to produce bytecode operations.
An interpreter: * accepts bytecode as input; * traverses the bytecode and performs the operation that each one represents; * uses a stack to help with the computations.
-
Each bytecode is defined by two things: the type of bytecode operation we're dealing with (e.g., pushing things on the stack or doing an operation); and the data associated with that bytecode operation, which not all bytecode operations need.
-
After we have our sequence of operations (bytecodes), we will “interpret” it. To interpret the bytecode means that we go over the bytecode, sequence by sequence, and at each point we perform the simple operation that the bytecode tells us to perform.
-
Bytecodes are just simple, atomic instructions that do one thing, and one thing only.
-
The four parts of our program
- Tokenizer takes source code as input and produces tokens;
- Parser takes tokens as input and produces an AST;
- Compiler takes an AST as input and produces bytecode;
- Interpreter takes bytecode as input and produces program results.
-
- Dec 2022
-
www.zhihu.com www.zhihu.com
-
IR和ByteCode有什么区别？
Tags
Annotators
URL
-