mjago

require "logger"

log = Logger.new(STDOUT)
log.level = Logger::WARN
critical = Logger.new(STDERR)

log.debug("Created logger")
log.info("Program started")
log.warn("Nothing to do!")
critical.error("Critical error!")

mjago

#require "../../spec_helper"
require "spec"
describe "Semantic: pointer" do
  it "types int pointer" do
    #     assert_type("a = 1; pointerof(a)") { pointer_of(int32) }
    (a = 1; pointerof(a)).class.should eq(Pointer(Int32))
  end

mjago

require "db"
require "sqlite3"
require "benchmark"

QUERY = "select id from numbers"
DB.open "sqlite3:./file.db" do |db|
  db.exec %q{DROP TABLE `numbers`}
end

DB.open "sqlite3:./file.db" do |db|

mjago

require "libao"
include Libao
# Simple Command Line Audio Player with VU-meter in Crystal (0.25.0)
# Requires ffmpeg and libao-dev
# dependencies:
#  shard dependency: github.com/mjago/libao
# Tested on mp3, flac, and m4a files

class Converter
  PIPE        = Process::Redirect::Pipe

mjago

Firs look at node visualisation
This is top-down but can be changed to left-to-right with some fiddling

mjago

require "../src/sdl"
require "../src/mixer"

SDL.init(SDL::Init::VIDEO | SDL::Init::AUDIO); at_exit { SDL.quit }
SDL::Mixer.init(SDL::Mixer::Init::MP3); at_exit { SDL::Mixer.quit }
SDL::Mixer.open

chunk = {} of String => LibMixer::Mix_Chunk*
names = %w(high medium low scratch)

mjago

lib SomeLib
  fun some_fun(LibC::Char*)
end

class SomeClass
  def some_fun(arg : String)
    SomeLib.some_fun(arg)
  end
end

mjago

diff -u /Users/martyn/.cache/crystal/initial_build/ /Users/martyn/.cache/crystal/Users-martyn-crystal-compile-empty.cr/
Binary files /Users/martyn/.cache/crystal/initial_build/H-ash40T-hread4432N-il41.bc and /Users/martyn/.cache/crystal/Users-martyn-crystal-compile-empty.cr/H-ash40T-hread4432N-il41.bc differ
Binary files /Users/martyn/.cache/crystal/initial_build/S-et40T-hread41.bc and /Users/martyn/.cache/crystal/Users-martyn-crystal-compile-empty.cr/S-et40T-hread41.bc differ
Binary files /Users/martyn/.cache/crystal/initial_build/T-hread.bc and /Users/martyn/.cache/crystal/Users-martyn-crystal-compile-empty.cr/T-hread.bc differ

* Initial Build:
** H-ash40T-hread4432N-il41.bc
debug info...
Hash(Thread, Nil).CrystalDebug Info Versionhash.cr/usr/local/Cellar/crystal-lang/HEAD-102be34_2/srcint
initialize:initial_capacity

mjago

llvm-config 3.9.1
Crystal 0.20.5+27 [03e69b7] (2017-01-31)
clang version 3.9.1 (tags/RELEASE_391/final)

Tue Jan 31: >  ./bin/crystal spec spec/compiler_spec.cr 
Using compiled compiler at .build/crystal
ld: warning: unknown dwarf DW_FORM_strp (offset=0x00000080) is too big in E-xception.o

ld: warning: unknown dwarf DW_FORM_strp (offset=0x00000080) is too big in H-ash40T-hread4432N-il41.o

mjago

non release compiler:
Wed Jan 25: compile/ >  bin/crystal ../examples/hello/hello.cr --
release --stats
Using compiled compiler at .build/crystal
Parse:                             00:00:00.0409620 (   0.19MB)
Semantic (top level):              00:00:00.5428400 (  26.57MB)
Semantic (new):                    00:00:00.0078450 (  26.57MB)
Semantic (type declarations):      00:00:00.0535600 (  26.57MB)
Semantic (abstract def check):     00:00:00.0026690 (  26.57MB)
Semantic (cvars initializers):     00:00:00.0243660 (  34.57MB)