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corbin-ocap17-slides.lyx
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#LyX 2.2 created this file. For more info see http://www.lyx.org/
\lyxformat 508
\begin_document
\begin_header
\save_transient_properties true
\origin unavailable
\textclass beamer
\begin_preamble
\usetheme{CambridgeUS}
\usepackage{listings}
\lstdefinelanguage{Monte}
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\lstset{language=Monte}
\end_preamble
\use_default_options true
\begin_modules
logicalmkup
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\cite_engine_type default
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\index Index
\shortcut idx
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\secnumdepth 3
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\paragraph_indentation default
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\tracking_changes false
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\end_header
\begin_body
\begin_layout Title
Monte: A Spiritual Successor to E
\end_layout
\begin_layout Author
Corbin Simpson
\end_layout
\begin_layout Institute
Matador Cloud LLC
\end_layout
\begin_layout Date
October 24, 2017
\end_layout
\begin_layout Frame
\begin_inset Argument 4
status open
\begin_layout Plain Layout
Overview
\end_layout
\end_inset
\end_layout
\begin_deeper
\begin_layout Itemize
Where did we come from?
\end_layout
\begin_layout Itemize
Why are we here?
\end_layout
\begin_layout Itemize
Where are we headed?
\end_layout
\end_deeper
\begin_layout Standard
\begin_inset Separator plain
\end_inset
\end_layout
\begin_layout Section
E: An Archeology
\end_layout
\begin_layout Frame
\begin_inset Argument 4
status open
\begin_layout Plain Layout
What is E?
\end_layout
\end_inset
\end_layout
\begin_deeper
\begin_layout Standard
E is a family of message-passing lambda calculi with:
\end_layout
\begin_layout Itemize
local state
\end_layout
\begin_layout Itemize
mutable closures
\end_layout
\begin_layout Itemize
single-shot delimited continuations (
\begin_inset Quotes eld
\end_inset
ejectors
\begin_inset Quotes erd
\end_inset
)
\end_layout
\begin_layout Itemize
managed runtime with:
\end_layout
\begin_deeper
\begin_layout Itemize
garbage collector, promises, safe scope
\end_layout
\begin_layout Itemize
compiler/interpreter tools
\end_layout
\begin_layout Itemize
communicating event loops (
\begin_inset Quotes eld
\end_inset
vats
\begin_inset Quotes erd
\end_inset
)
\end_layout
\end_deeper
\end_deeper
\begin_layout Standard
\begin_inset Separator plain
\end_inset
\end_layout
\begin_layout Frame
\begin_inset Argument 4
status open
\begin_layout Plain Layout
Timeline
\end_layout
\end_inset
\end_layout
\begin_deeper
\begin_layout Itemize
1993: Original-E
\end_layout
\begin_layout Itemize
1996: Joule
\end_layout
\begin_layout Itemize
1997: E-on-Java
\end_layout
\begin_layout Itemize
2004: Joe-E
\end_layout
\begin_layout Itemize
2005: E-on-CL
\end_layout
\begin_layout Itemize
2008: Caja, Ecru
\end_layout
\begin_layout Itemize
2012: Experiments (Greyface, Secret)
\end_layout
\begin_layout Itemize
2013:
\begin_inset Quotes eld
\end_inset
Original-Monte
\begin_inset Quotes erd
\end_inset
\end_layout
\begin_layout Itemize
2014: Monte-on-Typhon
\end_layout
\end_deeper
\begin_layout Standard
\begin_inset Separator plain
\end_inset
\end_layout
\begin_layout Frame
\begin_inset Argument 4
status open
\begin_layout Plain Layout
Whither E?
\end_layout
\end_inset
\end_layout
\begin_deeper
\begin_layout Standard
Knowledge of E is relatively rare.
Why? We can only guess:
\end_layout
\begin_layout Itemize
People were not ready for E in the 90s
\end_layout
\begin_layout Itemize
Capability-security theory remains unpopular
\end_layout
\begin_layout Itemize
October 2016: Winter finally arrived
\end_layout
\end_deeper
\begin_layout Section
Monte Essentials
\end_layout
\begin_layout Subsection
Changes to Semantics
\end_layout
\begin_layout FragileFrame
\begin_inset Argument 4
status open
\begin_layout Plain Layout
Named Arguments
\end_layout
\end_inset
\end_layout
\begin_deeper
\begin_layout Standard
Monte messages have one additional parameter.
\end_layout
\begin_layout Standard
\begin_inset listings
inline false
status open
\begin_layout Plain Layout
[verb :Str, args :List, namedArgs :Map]
\end_layout
\end_inset
\end_layout
\begin_layout Standard
This enables named arguments, including:
\end_layout
\begin_layout Itemize
Optional arguments, for configuration or forward-compatibility
\end_layout
\begin_layout Itemize
\begin_inset Quotes eld
\end_inset
Miranda
\begin_inset Quotes erd
\end_inset
named arguments provided by the runtime to every call
\end_layout
\end_deeper
\begin_layout Standard
\begin_inset Separator plain
\end_inset
\end_layout
\begin_layout FragileFrame
\begin_inset Argument 4
status open
\begin_layout Plain Layout
Sealed Exceptions
\end_layout
\end_inset
\end_layout
\begin_layout FragileFrame
\end_layout
\begin_deeper
\begin_layout Standard
Exceptions cannot be examined without
\begin_inset Flex Code
status open
\begin_layout Plain Layout
unsealException
\end_layout
\end_inset
!
\end_layout
\begin_layout Standard
We can deliver errors to only two places:
\end_layout
\begin_layout Itemize
The caller, via ejectors
\end_layout
\begin_layout Itemize
The debugger, via exceptions
\end_layout
\begin_layout Standard
\begin_inset listings
lstparams "frame=lines"
inline false
status open
\begin_layout Plain Layout
try { throw(42) } catch p { traceln.exception(p) }
\end_layout
\end_inset
\end_layout
\end_deeper
\begin_layout Standard
\begin_inset Separator plain
\end_inset
\end_layout
\begin_layout Subsection
Changes to Builtins
\end_layout
\begin_layout Frame
\begin_inset Argument 4
status open
\begin_layout Plain Layout
Changes to Safe Scope
\end_layout
\end_inset
\end_layout
\begin_deeper
\begin_layout Description
safeScope Objects which have no dangerous authority
\end_layout
\begin_layout Itemize
Many gratuitous renamings
\end_layout
\begin_deeper
\begin_layout Itemize
Less Java flavoring, more consistency
\end_layout
\end_deeper
\begin_layout Itemize
Adjustments for changes to Kernel-Monte
\end_layout
\begin_layout Itemize
Iterators
\end_layout
\begin_layout Itemize
\begin_inset Flex Code
status open
\begin_layout Plain Layout
Int
\end_layout
\end_inset
guards the ring of integers
\end_layout
\begin_layout Itemize
\begin_inset Flex Code
status open
\begin_layout Plain Layout
b``
\end_layout
\end_inset
and
\begin_inset Flex Code
status open
\begin_layout Plain Layout
Bytes
\end_layout
\end_inset
for bytestrings
\end_layout
\begin_layout Itemize
\begin_inset Flex Code
status open
\begin_layout Plain Layout
makeLazySlot
\end_layout
\end_inset
to work around lack of
\begin_inset Flex Code
status open
\begin_layout Plain Layout
EventuallyDeepFrozen
\end_layout
\end_inset
for the common case of wanting lazy private state
\end_layout
\begin_deeper
\begin_layout Itemize
Perhaps memoization is the only other interesting use case?
\end_layout
\end_deeper
\end_deeper
\begin_layout Standard
\begin_inset Separator plain
\end_inset
\end_layout
\begin_layout Frame
\begin_inset Argument 4
status open
\begin_layout Plain Layout
Iterators
\end_layout
\end_inset
\end_layout
\begin_deeper
\begin_layout Itemize
Small, tight, self-attenuating API
\end_layout
\begin_deeper
\begin_layout Itemize
\begin_inset Flex Code
status open
\begin_layout Plain Layout
iterable._makeIterator()
\end_layout
\end_inset
\end_layout
\begin_layout Itemize
\begin_inset Flex Code
status open
\begin_layout Plain Layout
iterator.next(ej)
\end_layout
\end_inset
\end_layout
\end_deeper
\begin_layout Itemize
Easy composition
\end_layout
\begin_layout Itemize
Incremental computation
\end_layout
\begin_deeper
\begin_layout Itemize
Iteration can be performed cleanly across many turns
\end_layout
\begin_layout Itemize
The cost of inverting control has been minimal
\end_layout
\end_deeper
\end_deeper
\begin_layout Standard
\begin_inset Separator plain
\end_inset
\end_layout
\begin_layout Subsection
Modules
\end_layout
\begin_layout Frame
\begin_inset Argument 4
status open
\begin_layout Plain Layout
Motivation for Modules
\end_layout
\end_inset
\end_layout
\begin_deeper
\begin_layout Itemize
Composition is good
\end_layout
\begin_layout Itemize
Compilation units are good
\end_layout
\begin_layout Itemize
Mutable global state is bad
\end_layout
\begin_layout Itemize
Petnames can be ugly, but globally-unique identifiers are bad
\end_layout
\begin_deeper
\begin_layout Itemize
Filesystem paths are dangerous and should be abstracted away
\end_layout
\end_deeper
\begin_layout Itemize
Our solution should be boring and easy to bootstrap
\end_layout
\end_deeper
\begin_layout Standard
\begin_inset Separator plain
\end_inset
\end_layout
\begin_layout FragileFrame
\begin_inset Argument 4
status open
\begin_layout Plain Layout
Modules on the Outside
\end_layout
\end_inset
\end_layout
\begin_deeper
\begin_layout Itemize
Zero or more export values
\end_layout
\begin_deeper
\begin_layout Itemize
Exports are selected by name, as in Haskell
\end_layout
\begin_layout Itemize
Exports must pass
\begin_inset Flex Code
status open
\begin_layout Plain Layout
DeepFrozen
\end_layout
\end_inset
\end_layout
\begin_layout Itemize
Export name
\begin_inset Flex Code
status open
\begin_layout Plain Layout
main
\end_layout
\end_inset
is an entrypoint
\end_layout
\end_deeper
\begin_layout Itemize
Zero or more import patterns
\end_layout
\begin_deeper
\begin_layout Itemize
Patterns are indexed by petname
\end_layout
\begin_layout Itemize
Each pattern matches against a map of names to import values
\end_layout
\begin_layout Itemize
One module's exports are another module's imports
\end_layout
\end_deeper
\begin_layout Standard
\begin_inset listings
lstparams "basicstyle={\footnotesize},frame=lines"
inline false
status open
\begin_layout Plain Layout
import "lib/iterators" =~ [=> zip :DeepFrozen]
\end_layout
\begin_layout Plain Layout
exports (zipSum)
\end_layout
\begin_layout Plain Layout
\end_layout
\begin_layout Plain Layout
def zipSum(left :List, right :List) :List as DeepFrozen:
\end_layout
\begin_layout Plain Layout
return [for [l, r] in (zip(left, right)) l + r]
\end_layout
\end_inset
\end_layout
\end_deeper
\begin_layout Standard
\begin_inset Separator plain
\end_inset
\end_layout
\begin_layout FragileFrame
\begin_inset Argument 4
status open
\begin_layout Plain Layout
Modules on the Inside
\end_layout
\end_inset
\end_layout
\begin_deeper
\begin_layout Itemize
Modules are plain old (zero-magic) Monte objects
\end_layout
\begin_deeper
\begin_layout Itemize
\begin_inset Flex Code
status open
\begin_layout Plain Layout
module.dependencies() :List[Str]
\end_layout
\end_inset
\end_layout
\begin_layout Itemize
\begin_inset Flex Code
status open
\begin_layout Plain Layout
module.run(package) :Map[Str, DeepFrozen]
\end_layout
\end_inset
\end_layout
\begin_layout Itemize
\begin_inset Flex Code
status open
\begin_layout Plain Layout
package.
\begin_inset Quotes erd
\end_inset
import
\begin_inset Quotes erd
\end_inset
(petname :Str)
\end_layout
\end_inset
\end_layout
\end_deeper
\begin_layout Standard
\begin_inset listings
lstparams "basicstyle={\footnotesize},frame=lines"
inline false
status open
\begin_layout Plain Layout
object _ as DeepFrozen:
\end_layout
\begin_layout Plain Layout
to dependencies() :List[Str]:
\end_layout
\begin_layout Plain Layout
return ["lib/iterators"]
\end_layout
\begin_layout Plain Layout
to run(package) :Map[Str, DeepFrozen]:
\end_layout
\begin_layout Plain Layout
def [=> zip :DeepFrozen] | _ := package."import"(
\end_layout
\begin_layout Plain Layout
"lib/iterators")
\end_layout
\begin_layout Plain Layout
def zipSum(left :List, right :List) :List as DeepFrozen:
\end_layout
\begin_layout Plain Layout
return [for [l, r] in (zip(left, right)) l + r]
\end_layout
\begin_layout Plain Layout
return [=> zipSum]
\end_layout
\end_inset
\end_layout
\end_deeper
\begin_layout Standard
\begin_inset Separator plain
\end_inset
\end_layout
\begin_layout Section
The Future
\end_layout
\begin_layout Frame
\begin_inset Argument 4
status open
\begin_layout Plain Layout
What's Next?
\end_layout
\end_inset
\end_layout
\begin_deeper
\begin_layout Itemize
New compiler stages
\end_layout
\begin_layout Itemize
New parser combinator library
\end_layout
\begin_layout Itemize
Community projects
\end_layout
\end_deeper
\begin_layout Standard
\begin_inset Separator plain
\end_inset
\end_layout
\begin_layout Frame
\begin_inset Argument 4
status open
\begin_layout Plain Layout
The End
\end_layout
\end_inset
\end_layout
\begin_deeper
\begin_layout Itemize
Questions?
\end_layout
\begin_layout Itemize
Thanks!
\end_layout
\end_deeper
\end_body
\end_document