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[E-Dev-Day-US-2015][9/9] High Level Application Development with Elua (Daniel Kolesa)

The document discusses the challenges of application development in C and critiques various scripting languages, ultimately highlighting Lua and its JIT compiler, LuaJIT, as effective solutions for high-level application development. It introduces eLua, a lightweight application runtime aimed at facilitating rapid application development with a clean API and ease of app distribution. The document outlines the current state of eLua, plans for future improvements, and the integration of a binding generator to streamline the creation of APIs for applications.

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High Level Application Development with Elua ... or what happens when C sucks too much Daniel Kolesa Samsung Open Source Group d.kolesa@samsung.com @octaforge EFL Developer Day US 2015
The Problem What are we dealing with?
Overview
Overview Sick and tired of writing apps in C
Overview Sick and tired of writing apps in C There has to be a better way
Overview Sick and tired of writing apps in C There has to be a better way Scripting languages?
Overview Sick and tired of writing apps in C There has to be a better way Scripting languages? They mostly suck
Why do most scripting languages suck?
Why do most scripting languages suck? Slow
Why do most scripting languages suck? Slow Lack of a proper type system
Why do most scripting languages suck? Slow Lack of a proper type system Tons of useless bloat we don’t need
Why do most scripting languages suck? Slow Lack of a proper type system Tons of useless bloat we don’t need Inherently sucky to bind
Why do most scripting languages suck? Slow Lack of a proper type system Tons of useless bloat we don’t need Inherently sucky to bind Resource heavy
Why do most scripting languages suck? Slow Lack of a proper type system Tons of useless bloat we don’t need Inherently sucky to bind Resource heavy Battery eating
Why do most scripting languages suck? Slow Lack of a proper type system Tons of useless bloat we don’t need Inherently sucky to bind Resource heavy Battery eating Let’s still give them a shot
Scripting language overview
Python
Python An obvious choice at first
Python An obvious choice at first Tons of problems
Python An obvious choice at first Tons of problems Slooooow
Python An obvious choice at first Tons of problems Slooooow Bloated
Python An obvious choice at first Tons of problems Slooooow Bloated No decent unified API
Python An obvious choice at first Tons of problems Slooooow Bloated No decent unified API Hard to embed
Python An obvious choice at first Tons of problems Slooooow Bloated No decent unified API Hard to embed Language design issues
Ruby
Ruby A not so obvious choice
Ruby A not so obvious choice Tons of problems
Ruby A not so obvious choice Tons of problems Slooooow
Ruby A not so obvious choice Tons of problems Slooooow Bloated
Ruby A not so obvious choice Tons of problems Slooooow Bloated No decent unified API
Ruby A not so obvious choice Tons of problems Slooooow Bloated No decent unified API Hard to embed
Ruby A not so obvious choice Tons of problems Slooooow Bloated No decent unified API Hard to embed Language design issues
Perl
Perl You serious?
Perl You serious? Tons of problems
Perl You serious? Tons of problems Slooooow
Perl You serious? Tons of problems Slooooow Bloated
Perl You serious? Tons of problems Slooooow Bloated No decent unified API
Perl You serious? Tons of problems Slooooow Bloated No decent unified API Hard to... ok, that’s enough, see the pattern?
JavaScript
JavaScript Popular these days
JavaScript Popular these days Fairly decent quality JIT implementations
JavaScript Popular these days Fairly decent quality JIT implementations Weird APIs
JavaScript Popular these days Fairly decent quality JIT implementations Weird APIs Language is pretty bad
JavaScript Popular these days Fairly decent quality JIT implementations Weird APIs Language is pretty bad But probably a better choice than the above
Io, Self, Squirrel etc.
Io, Self, Squirrel etc. Many different choices
Io, Self, Squirrel etc. Many different choices Mostly slow interpreters
Io, Self, Squirrel etc. Many different choices Mostly slow interpreters Some are decent-ish languages
Io, Self, Squirrel etc. Many different choices Mostly slow interpreters Some are decent-ish languages Mostly fairly light on resources
Io, Self, Squirrel etc. Many different choices Mostly slow interpreters Some are decent-ish languages Mostly fairly light on resources Not good enough
Io, Self, Squirrel etc. Many different choices Mostly slow interpreters Some are decent-ish languages Mostly fairly light on resources Not good enough People would look at us weird
Lua
Lua A popular scripting language
Lua A popular scripting language Fairly good language with a few quirks
Lua A popular scripting language Fairly good language with a few quirks Light on resources
Lua A popular scripting language Fairly good language with a few quirks Light on resources Great embedding API
Lua A popular scripting language Fairly good language with a few quirks Light on resources Great embedding API Interpreted... :(
Lua A popular scripting language Fairly good language with a few quirks Light on resources Great embedding API Interpreted... :( LuaJIT saves the day
Why is LuaJIT awesome?
Why is LuaJIT awesome? One of the fastest JIT compilers around
Why is LuaJIT awesome? One of the fastest JIT compilers around Very light on resources
Why is LuaJIT awesome? One of the fastest JIT compilers around Very light on resources Performance close to C for real world scenarios
Why is LuaJIT awesome? One of the fastest JIT compilers around Very light on resources Performance close to C for real world scenarios The exact same API as Lua!
Why is LuaJIT awesome? One of the fastest JIT compilers around Very light on resources Performance close to C for real world scenarios The exact same API as Lua! API and ABI compatible with Lua 5.1
Why is LuaJIT awesome? One of the fastest JIT compilers around Very light on resources Performance close to C for real world scenarios The exact same API as Lua! API and ABI compatible with Lua 5.1 Portable bytecode
Why is LuaJIT awesome? One of the fastest JIT compilers around Very light on resources Performance close to C for real world scenarios The exact same API as Lua! API and ABI compatible with Lua 5.1 Portable bytecode We have a winner
Why LuaJIT sucks
Why LuaJIT sucks VM written in assembly - only a handful of architectures
Why LuaJIT sucks VM written in assembly - only a handful of architectures OTOH, it’s good enough
Why LuaJIT sucks VM written in assembly - only a handful of architectures OTOH, it’s good enough Classic Lua C API is not JITed
Why LuaJIT sucks VM written in assembly - only a handful of architectures OTOH, it’s good enough Classic Lua C API is not JITed A handful of other things not JITed
Why LuaJIT sucks VM written in assembly - only a handful of architectures OTOH, it’s good enough Classic Lua C API is not JITed A handful of other things not JITed No multithreading support
Why LuaJIT sucks VM written in assembly - only a handful of architectures OTOH, it’s good enough Classic Lua C API is not JITed A handful of other things not JITed No multithreading support LuaJIT 2.1 significantly improves the situation
Elua
What is it?
What is it? An application runtime
What is it? An application runtime Ships with the EFL
What is it? An application runtime Ships with the EFL Lightweight
What is it? An application runtime Ships with the EFL Lightweight Reusable
What is it supposed to achieve?
What is it supposed to achieve? Rapid application development
What is it supposed to achieve? Rapid application development Clean, high level code
What is it supposed to achieve? Rapid application development Clean, high level code Lightweight, good performance
What is it supposed to achieve? Rapid application development Clean, high level code Lightweight, good performance Easier app distribution (app store model)
What is it supposed to achieve? Rapid application development Clean, high level code Lightweight, good performance Easier app distribution (app store model) More safety (memory etc.)
How does it work?
How does it work? Elua library and binary
How does it work? Elua library and binary Library provides Elua-related C utilities for the Lua state
How does it work? Elua library and binary Library provides Elua-related C utilities for the Lua state Binary is a minimal application launcher
How does it work? Elua library and binary Library provides Elua-related C utilities for the Lua state Binary is a minimal application launcher Together they set up Lua state + ecore main loop
How does it work? Elua library and binary Library provides Elua-related C utilities for the Lua state Binary is a minimal application launcher Together they set up Lua state + ecore main loop Most of Elua is written in Lua itself
Bindings
Bindings Any decent application runtime needs APIs
Bindings Any decent application runtime needs APIs Writing bindings is a pain in the ass
Bindings Any decent application runtime needs APIs Writing bindings is a pain in the ass Maintaining bindings is a bigger pain in the ass
Bindings Any decent application runtime needs APIs Writing bindings is a pain in the ass Maintaining bindings is a bigger pain in the ass What do?
Eolian
Eolian Eolian parses our API definitions
Eolian Eolian parses our API definitions We can reuse Eolian data to generate correct Lua bindings
Eolian Eolian parses our API definitions We can reuse Eolian data to generate correct Lua bindings No maintenance burden except the generator itself
Lualian
Lualian Lualian is the Elua binding generator
Lualian Lualian is the Elua binding generator Itself a Lua application powered by Elua
Lualian Lualian is the Elua binding generator Itself a Lua application powered by Elua Easy to maintain and high level
Lualian Lualian is the Elua binding generator Itself a Lua application powered by Elua Easy to maintain and high level Bindings generated at EFL build time
How do our bindings work?
How do our bindings work? LuaJIT provides a FFI interface
How do our bindings work? LuaJIT provides a FFI interface This allows us to directly access C APIs
How do our bindings work? LuaJIT provides a FFI interface This allows us to directly access C APIs Lualian generates a FFI-powered binding layer
Eo
Eo We have a Lua Eo layer
Eo We have a Lua Eo layer This provides a native-feeling Eo Lua core
Eo We have a Lua Eo layer This provides a native-feeling Eo Lua core Handles callbacks, method resolution and other things
Eo We have a Lua Eo layer This provides a native-feeling Eo Lua core Handles callbacks, method resolution and other things Generated bindings properly register bound classes with this
Eo We have a Lua Eo layer This provides a native-feeling Eo Lua core Handles callbacks, method resolution and other things Generated bindings properly register bound classes with this Native-feeling APIs!
Other Elua APIs
Other Elua APIs Elua also provides a collection of Lua utilities
Other Elua APIs Elua also provides a collection of Lua utilities This includes a Lua-side object system
Other Elua APIs Elua also provides a collection of Lua utilities This includes a Lua-side object system Also bindings to most relevant Eina components
Other Elua APIs Elua also provides a collection of Lua utilities This includes a Lua-side object system Also bindings to most relevant Eina components Used by bindings
Other Elua APIs Elua also provides a collection of Lua utilities This includes a Lua-side object system Also bindings to most relevant Eina components Used by bindings Eo interacts with our Lua-side object system
Other Elua APIs Elua also provides a collection of Lua utilities This includes a Lua-side object system Also bindings to most relevant Eina components Used by bindings Eo interacts with our Lua-side object system Completely transparent
Distribution
Distribution Bundled with EFL → always available
Distribution Bundled with EFL → always available App store to promote development and distribution of apps
Distribution Bundled with EFL → always available App store to promote development and distribution of apps Well supported - encouraging people to write apps
Distribution Bundled with EFL → always available App store to promote development and distribution of apps Well supported - encouraging people to write apps Closely matching EFL APIs → free documentation
Distribution Bundled with EFL → always available App store to promote development and distribution of apps Well supported - encouraging people to write apps Closely matching EFL APIs → free documentation Needs self-contained package format (use eet?)
Distribution Bundled with EFL → always available App store to promote development and distribution of apps Well supported - encouraging people to write apps Closely matching EFL APIs → free documentation Needs self-contained package format (use eet?) Make it possible to run Elua apps on Tizen?
Status
Where are we?
Where are we? Working, solid base
Where are we? Working, solid base Binding generator needs some work
Where are we? Working, solid base Binding generator needs some work Elua library needs a lot of work
Where are we? Working, solid base Binding generator needs some work Elua library needs a lot of work EFL interfaces
EFL interfaces
EFL interfaces A linked project
EFL interfaces A linked project Design and implement EFL 2.0 APIs
EFL interfaces A linked project Design and implement EFL 2.0 APIs Eo based
EFL interfaces A linked project Design and implement EFL 2.0 APIs Eo based Why is this relevant to bindings?
Eo files
Eo files Our current Eo files are not complete
Eo files Our current Eo files are not complete Missing enum definitions, structs etc.
Eo files Our current Eo files are not complete Missing enum definitions, structs etc. Complete Eo files → validation is possible
Eo files Our current Eo files are not complete Missing enum definitions, structs etc. Complete Eo files → validation is possible Guaranteed definitions for types etc.
Eo files Our current Eo files are not complete Missing enum definitions, structs etc. Complete Eo files → validation is possible Guaranteed definitions for types etc. Allows for proper binding generation
What does this all mean?
What does this all mean? Our bindings are currently not fully functional
What does this all mean? Our bindings are currently not fully functional Many will fail to load because of missing type definitions
What does this all mean? Our bindings are currently not fully functional Many will fail to load because of missing type definitions Dependencies are not correctly handled
What does this all mean? Our bindings are currently not fully functional Many will fail to load because of missing type definitions Dependencies are not correctly handled Elementary is not handled at all
What does this all mean? Our bindings are currently not fully functional Many will fail to load because of missing type definitions Dependencies are not correctly handled Elementary is not handled at all Our demos work with what we have + manually adjusted bindings
Other issues
Other issues Internationalization and localization
Other issues Internationalization and localization Loading files from VFS/Eet and seamless API for that
Other issues Internationalization and localization Loading files from VFS/Eet and seamless API for that Sandboxing
Other issues Internationalization and localization Loading files from VFS/Eet and seamless API for that Sandboxing Startup time minimization
Other issues Internationalization and localization Loading files from VFS/Eet and seamless API for that Sandboxing Startup time minimization Portable bytecode loading
Roadmap
EFL 1.14
EFL 1.14 Steady progress on Eo files
EFL 1.14 Steady progress on Eo files Basic interfaces done
EFL 1.14 Steady progress on Eo files Basic interfaces done Design issues resolved
EFL 1.15
EFL 1.15 Correctly working bindings without manual modifications
EFL 1.15 Correctly working bindings without manual modifications Maybe just wishful thinking
EFL 1.15 Correctly working bindings without manual modifications Maybe just wishful thinking Gotta get as close as possible
EFL 1.15 Correctly working bindings without manual modifications Maybe just wishful thinking Gotta get as close as possible EFL interfaces should be mostly designed
EFL 1.15 Correctly working bindings without manual modifications Maybe just wishful thinking Gotta get as close as possible EFL interfaces should be mostly designed Properly validating Eo files
EFL 1.16
EFL 1.16 Initial proof-of-concept implementation of Bob
EFL 1.16 Initial proof-of-concept implementation of Bob Further stabilized Lua bindings
EFL 1.16 Initial proof-of-concept implementation of Bob Further stabilized Lua bindings Eoifying further EFL libraries
EFL 1.16 Initial proof-of-concept implementation of Bob Further stabilized Lua bindings Eoifying further EFL libraries Production-ready bindings
EFL 1.17
EFL 1.17 Further Bob work
EFL 1.17 Further Bob work Bob should start matching Edje in functionality
EFL 1.17 Further Bob work Bob should start matching Edje in functionality Deprecation of non-luajit EFL builds
EFL 1.17 Further Bob work Bob should start matching Edje in functionality Deprecation of non-luajit EFL builds Wider testing of Elua/Bob
EFL 1.17 Further Bob work Bob should start matching Edje in functionality Deprecation of non-luajit EFL builds Wider testing of Elua/Bob Initial Elua based applications!
EFL 2.0
EFL 2.0 Will take a while (several 1.x releases before that)
EFL 2.0 Will take a while (several 1.x releases before that) Things have to be rock solid by then
EFL 2.0 Will take a while (several 1.x releases before that) Things have to be rock solid by then A lot of work
EFL 2.0 Will take a while (several 1.x releases before that) Things have to be rock solid by then A lot of work Bob will be a thing
EFL 2.0 Will take a while (several 1.x releases before that) Things have to be rock solid by then A lot of work Bob will be a thing Deprecation of Edje
Code breakdown
Entry point
Entry point Everything starts in the Elua launcher
Entry point Everything starts in the Elua launcher Lua state gets initialized
Entry point Everything starts in the Elua launcher Lua state gets initialized Elua supports application lookup path
Entry point Everything starts in the Elua launcher Lua state gets initialized Elua supports application lookup path Apps get executed
Entry point Everything starts in the Elua launcher Lua state gets initialized Elua supports application lookup path Apps get executed Ecore main loop is started
Module system
Module system Elua provides a custom module system that works outside of Lua’s
Module system Elua provides a custom module system that works outside of Lua’s Seamless (replaces require)
Module system Elua provides a custom module system that works outside of Lua’s Seamless (replaces require) Modules support init/shutdown callbacks
Module system Elua provides a custom module system that works outside of Lua’s Seamless (replaces require) Modules support init/shutdown callbacks Those take care of opening and closing the appropriate libs
Library system
Library system C libraries are opened and initialized as necessary
Library system C libraries are opened and initialized as necessary Opened C libraries are cached and reference counted
Library system C libraries are opened and initialized as necessary Opened C libraries are cached and reference counted Eolian-generated bindings use this
Library system C libraries are opened and initialized as necessary Opened C libraries are cached and reference counted Eolian-generated bindings use this Symbols are retrieved and bound using C FFI
Library system C libraries are opened and initialized as necessary Opened C libraries are cached and reference counted Eolian-generated bindings use this Symbols are retrieved and bound using C FFI This is wrapped in high level API (no FFI exposed to apps)
Eina bindings
Eina bindings Elua provides hand-bound APIs from Eina
Eina bindings Elua provides hand-bound APIs from Eina Containers are read only
Eina bindings Elua provides hand-bound APIs from Eina Containers are read only Provides APIs to convert them to Lua values
Eina bindings Elua provides hand-bound APIs from Eina Containers are read only Provides APIs to convert them to Lua values Various modules like accessor, iterator, list, log, file etc.
Eina bindings Elua provides hand-bound APIs from Eina Containers are read only Provides APIs to convert them to Lua values Various modules like accessor, iterator, list, log, file etc. Will be further expanded as necessary
Other modules
Other modules Elua includes a benchmarking module in core
Other modules Elua includes a benchmarking module in core Also features a powerful command line argument parser
Other modules Elua includes a benchmarking module in core Also features a powerful command line argument parser Lualian is included
Other modules Elua includes a benchmarking module in core Also features a powerful command line argument parser Lualian is included A custom module system implementation
Other modules Elua includes a benchmarking module in core Also features a powerful command line argument parser Lualian is included A custom module system implementation Util module provides an object system, library system, string buffer implementation and other utils
Conclusion
Conclusion Still largely incomplete
Conclusion Still largely incomplete Getting there
Conclusion Still largely incomplete Getting there Eo files need work
Conclusion Still largely incomplete Getting there Eo files need work Eolian validator needs to be fully enabled
Conclusion Still largely incomplete Getting there Eo files need work Eolian validator needs to be fully enabled Lua APIs need plenty of work
Thank you. Daniel Kolesa Samsung Open Source Group d.kolesa@samsung.com @octaforge EFL Developer Day US 2015

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