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How is !
magic !
formed
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Rin!
@rinpaku @bitcrowd
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No content
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WHY?
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TIL: There’s bacon in!
the Ruby source code
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What happens when Ruby runs my code?!
!
What is an Object?
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What happens !
when Ruby !
runs my code?
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Ruby code
9.times do
puts "Ente"
end
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Tokens
9 . t i m e s …
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9 . times do puts ""
Tokens
9 . t i m e s …
integer identifier identifier
period keyword strin
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Syntax Tree
do_block
period
method_add_block
integer!
9
identifier!
times
call
command
identifier!
puts
…
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YARV instructions
“Yet Another Ruby Virtual Machine”
== catch table
| catch type: break st: 0002 ed: 0006 sp: 0000 cont: 0006
|--------------------------------------------------------------
0000 trace 1
0002 putobject 9
0004 send @
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I MIGHT!
HAVE MADE
THIS ALL UP
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Tokenizing
Ripper.lex(your_code)
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parse.c
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with Ripper:
Ripper.sexp(your_code)
!
Parsing
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with Ripper:
Ripper.sexp(your_code)
parser debug information:
ruby -y example.rb
Parsing
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RubyVM::InstructionSequence.
compile(code).disasm
Compiling
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What !
is an!
Object?
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struct meetup {
char title[120];
time_t starts_at;
bool has_talks;
};
Structs
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union location {
char address[120];
struct position {
int latitude;
int longitude;
}
};
Union
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struct meetup {
char title[120];
time_t starts_at;
bool has_talks;
union {
char address[120];
struct position {
int latitude;
int longitude;
}
}
};
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Let’s look at some
source code
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RObject
struct RObject {
struct RBasic basic;
…
};
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RBasic
struct RBasic {
VALUE flags;
const VALUE klass;
};
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RObject
struct RObject {
struct RBasic basic;
struct {
long numiv;
VALUE *ivptr;
struct st_table *iv_index_tbl;
} heap;
};
simplified
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RObject
struct RObject {
struct RBasic basic;
union {
struct {
long numiv;
VALUE *ivptr;
struct st_table *iv_index_tbl;
} heap;
VALUE ary[ROBJECT_EMBED_LEN_MAX];
} as;
};
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RFloat
struct RFloat {
struct RBasic basic;
double float_value;
};
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- Reading C is not that bad.*
*(If you hate it, you can still look at the
Standard Library or Rubinius.)!
!
- Check out the Ruby source code
and give a talk about it. ;)
Things to take home
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WAIT! Where’s the bacon?
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Never create Ruby Strings longer than
23 characters
!
Ruby under a microscope
(the book)
!
The Ruby Hacking Guide
(Warning: Ruby 1.7.3!)
!
A Tour of the Ruby MRI Source Code
with Pat Shaughnessy
Some Links