Class: Hornetseye::GCCContext

Inherits:
Object
  • Object
show all
Defined in:
lib/multiarray/gcccontext.rb

Overview

Context object for creating a Ruby extension

Constant Summary collapse

CFG =

Ruby configuration

RbConfig::CONFIG
CFLAGS =

GCC compiler flags

"-DNDEBUG #{CFG[ 'CFLAGS' ]} " +
"-I#{CFG['archdir']}"
LIBRUBYARG =

Arguments for linking the Ruby extension

"-L#{CFG[ 'libdir' ]} #{CFG[ 'LIBRUBYARG' ]} #{CFG[ 'LDFLAGS' ]} "
LDSHARED =

Command for linking the Ruby extension

CFG[ 'LDSHARED' ]
DLEXT =

Shared library file extension under current operating system

CFG[ 'DLEXT' ]
DIRNAME =

Directory for storing the Ruby extensions

"#{Dir.tmpdir}/hornetseye-ruby#{RUBY_VERSION}-" +
"#{ENV[ 'USER' ] || ENV[ 'USERNAME' ]}"
LOCKFILE =

Lock file to prevent conflicts

"#{DIRNAME}/lock"
@@lock =

The actual file lock

File.new LOCKFILE, 'w', 0600
@@lib_name =

Next available base name for a Ruby extension

'hornetseye_aaaaaaaa'

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(lib_name) ⇒ GCCContext

Initialises an empty Ruby extension

Parameters:

  • lib_name (String) —

    Base name of library to create later.



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# File 'lib/multiarray/gcccontext.rb', line 113

def initialize( lib_name )
  @lib_name = lib_name
  @c_instructions = ''
  @c_wrappers = ''
  @c_registrations = ''
end

Class Method Details

.build(&action) ⇒ Object

Method for compiling Ruby to C

Parameters:

  • action (Proc) —

    The code block needs to accept a GCCContext object.

Returns:

  • (Object) —

    Returns result of code block.

See Also:



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# File 'lib/multiarray/gcccontext.rb', line 101

def build( &action )
  lib_name, @@lib_name = @@lib_name, @@lib_name.succ
  new( lib_name ).build &action
end

Instance Method Details

#<<(str) ⇒ GCCContext

Add instructions to Ruby extension

The given string is appended to the source code of the Ruby extension.

Parameters:

  • str (String) —

    String with source code fragment of Ruby extension.

Returns:



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# File 'lib/multiarray/gcccontext.rb', line 254

def <<( str )
  @c_instructions << str
  self
end

#build(&action) ⇒ Object

Create Ruby extension

Parameters:

  • action (Proc) —

    Code block accepting a GCCContext object.

Returns:

  • (Object) —

    Returns result of code block.



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# File 'lib/multiarray/gcccontext.rb', line 127

def build( &action )
  action.call self
end

#compile ⇒ Boolean

Compile the Ruby extension

This method writes the source code to a file and calls GCC to compile it. Finally the Ruby extension is loaded.

Returns:

  • (Boolean) —

    Returns of loading the Ruby extension.



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# File 'lib/multiarray/gcccontext.rb', line 179

def compile
  c_template = <<EOS
/* This file is generated automatically. It is pointless to edit this file. */
#include <ruby.h>
#include <math.h>

inline void *mallocToPtr( VALUE rbMalloc )
{
  void *retVal; Data_Get_Struct( rbMalloc, void, retVal );
  return retVal;
}

static unsigned long make_mask( unsigned long x )
{
  x = x | x >> 1;
  x = x | x >> 2;
  x = x | x >> 4;
  x = x | x >> 8;
  x = x | x >> 16;
#if 4 < SIZEOF_LONG
  x = x | x >> 32;
#endif
  return x;
}

static unsigned long limited_rand(unsigned long limit)
{
  int i;
  unsigned long mask, val;
  if (limit < 2) return 0;
  mask = make_mask(limit - 1);
  retry:
  val = 0;
  for (i = SIZEOF_LONG / 4 - 1; 0 <= i; i--) {
if ((mask >> (i * 32)) & 0xffffffff) {
  val |= (unsigned long)rb_genrand_int32() << (i * 32);
  val &= mask;
  if (limit <= val)
    goto retry;
};
  };
  return val;
}

#{@c_instructions}

#{@c_wrappers}
void Init_#{@lib_name}(void)
{
  VALUE mHornetseye = rb_define_module("Hornetseye");
  VALUE cGCCCache = rb_define_class_under(mHornetseye, "GCCCache", rb_cObject);
#{@c_registrations}
}
EOS
  # File::EXCL no overwrite
  File.open "#{DIRNAME}/#{@lib_name}.c", 'w', 0600 do |f|
    f << c_template
  end
  gcc = "#{LDSHARED} #{CFLAGS} -o #{DIRNAME}/#{@lib_name}.#{DLEXT} " +
        "#{DIRNAME}/#{@lib_name}.c #{LIBRUBYARG}"
  # puts c_template
  # puts gcc
  raise "The following command failed: #{gcc}" unless system gcc
  require "#{DIRNAME}/#{@lib_name}"
end

#function(descriptor, *param_types) ⇒ GCCFunction

Add a new function to the Ruby extension

Parameters:

  • descriptor (String) —

    Method name of function.

  • param_types (Array<GCCType>) —

    Array with parameter types.

Returns:



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# File 'lib/multiarray/gcccontext.rb', line 139

def function( descriptor, *param_types )
  @c_instructions << <<EOS
VALUE #{descriptor}( #{
param_types.collect do |t|
  t.identifiers
end.flatten.collect_with_index do |ident,i|
  "#{ident} param#{i}"
end.join ', '
} )
{
EOS

  @c_wrappers << <<EOS
VALUE wrap#{descriptor.capitalize}( int argc, VALUE *argv, VALUE rbSelf )
{
  #{descriptor}( #{
param_types.collect do |t|
  t.r2c
end.flatten.collect_with_index do |conv,i|
  "#{conv.call "argv[#{i}]"}"
end.join ', '
  } );
  return Qnil;
}
EOS

  @c_registrations << <<EOS
  rb_define_singleton_method(cGCCCache, "#{descriptor}",
                         RUBY_METHOD_FUNC( wrap#{descriptor.capitalize} ), -1); 
EOS
end