Added intro slides

Author: Shing Lyu

docs/slides/intro/pic/ice-cream.jpg

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+class: center, middle
+##Python Interpreter in Rust
+###Introduction
+#### 2017/3/28
+#### Shing Lyu
+
+
+???
+top, middle, bottom
+left, center, right
+
+---
+name: toc
+###Agenda
+1. Category 
+1. Category 
+1. Category 
+1. Category 
+1. Category 
+1. Category 
+1. Category 
+
+???
+This is a template
+---
+
+### Python's architecture
+* Interpreted
+* Garbage Collected
+* Compiler => bytecode => VM
+
+---
+background-image: url('pic/ice-cream.jpg')
+class: bleed
+# Flavors
+
+
+---
+### Python Flavors
+* CPython (THE python)
+* Jython (JVM)
+* IronPython (.NET)
+* Pypy
+* Educational
+  * Byterun
+  * Jsapy (JS)
+  * Brython (Python in browser)
+
+---
+### Why rewriting Python in Rust?
+* Memory safety
+
+* Learn about Python internal
+* Learn real world Rust
+
+---
+### Implementation strategy
+* Focus on the VM first, then the compiler
+  * Reuse the Python built-in compiler to generate bytecode
+* Basic arithmetics
+* Control flows (require JUMP)
+* Function call (require call stack)
+* Built-in functions (require native code)
+* Run popular libraries
+
+
+---
+### References
+* [`dis` documentation](https://docs.python.org/3.4/library/dis.html)
+* [byterun](http://www.aosabook.org/en/500L/a-python-interpreter-written-in-python.html)
+* [byterun (GitHub)](https://github.com/nedbat/byterun/)
+* [cpython source code](https://github.com/python/cpython)
+
+---
+### How Python VM works
+* Stack machine
+* Accepts Python bytecode
+* `python -m dis source.py`
+
+---
+
+### A simple Python code
+
+```
+#!/usr/bin/env python3
+print(1+1)
+```
+
+We run `python3 -m dis source.py`
+
+---
+
+### The bytecode
+
+```
+  1    0 LOAD_NAME           0 (print)
+       3 LOAD_CONST          2 (2)
+       6 CALL_FUNCTION       1 (1 positional, 0 keyword pair)
+       9 POP_TOP
+      10 LOAD_CONST          1 (None)
+      13 RETURN_VALUE
+
+```
+
+---
+
+### LOAD_NAME "print"
+* NAMES = ["print"]
+* CONSTS = [None, 2]
+* STACK:
+
+```
+ |                    |
+ | print (native code)|
+ +--------------------+
+```
+---
+### LOAD_CONST 2
+* NAMES = ["print"]
+* CONSTS = [None, 2]
+* STACK:
+
+```
+ |                    |
+ |          2         |
+ | print (native code)|
+ +--------------------+
+```
+
+---
+
+### CALL_FUNCTION 1
+1. argument = stack.pop() (argument == 2)
+2. function = stack.top() (function == print)
+3. call print(2)
+
+* NAMES = ["print"]
+* CONSTS = [None, 2]
+* STACK:
+
+```
+ |                    |
+ | print (native code)|
+ +--------------------+
+```
+---
+### POP_TOP
+* NAMES = ["print"]
+* CONSTS = [None, 2]
+* STACK:
+
+```
+ |                    |
+ |     (empty)        |
+ +--------------------+
+```
+
+---
+### LOAD_CONST 1
+* NAMES = ["print"]
+* CONSTS = [None, 2]
+* STACK:
+
+```
+ |                    |
+ |       None         |
+ +--------------------+
+```
+
+---
+### RETURN_VALUE
+
+(returns top of stack == None)
+
+---
+
+### Next step
+* Make it run a small but popular tool/library
+* Implement the parser
+* Performance benchmarking