Page 1

Peek and Poke with Dependent Types

Page 2

House Today (1)

Uses GHC (the Glasgow Haskell Compiler)

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House Today (2)

Does the Haskell type system give us what we need?

Page 4

At the Machine Level...

Primitives for memory access

Page 5

Safety Through Abstraction

Page 6

Hardware Monad Examples

Page 7

Another Experiment: An Alfa version of House?

Page 8

A Minimal Compiler and Run-Time System

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Compiler and run-time system

Based on the <ν,G> machine [2]

Page 10

An example

Hello world!

Page 11

Peek and Poke again

Primitives for memory access

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Abstraction for limited memory access

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Text screen buffer access (1)

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Text screen buffer access (2)

Using Predicate Based Subtyping

Page 15

Abstraction for displaying text

Page 16

Alfa proofs (or lack thereof)

Page 17

Example of extended static checking

Displaying strings that fit on the screen

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Hello world!

Page 19

Problems

Page 20

Future work?

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The End

Any more questions?

Page 22

References