tenderlove

# Have you ever wanted lldb to break in a certain place, but you weren't
# sure where to set the breakpoint?  Look no further than this script!
#
# This script creates a chunk of executable code that uses the int3 x86
# instruction.  This instruction is defined for use by debuggers, and you can
# read more about it here: https://en.wikipedia.org/wiki/INT_%28x86_instruction%29#INT3
#
# When that instruction is executed, the debugger will halt and you can do
# what you need!
#

tenderlove

require "objspace"
require "json"

def go x
  count = GC.stat(:major_gc_count)
  loop do
    info = JSON.parse(ObjectSpace.dump(x))
    break if info["flags"]["old"]
    GC.start
  end

tenderlove

#!/usr/bin/env ruby
require 'pp'

files = {'vm.inc' => [], 'insns.def' => []}
current_insn = nil
current_filename = 'vm.inc'
lineno_offset = 0
IO.foreach('vm.inc') do |line|
  case line
  when /^INSN_ENTRY\((\w+)\)/

tenderlove

# Not Great PNG class.  This is a very simple example of writing a PNG.  It
# only supports colors from the color palette stored in `@palette`.  This is
# meant to be example code, but I am using it in a program for visualizing
# heap dumps from Ruby.
#
# This is free and unencumbered software released into the public domain.
#
# Anyone is free to copy, modify, publish, use, compile, sell, or
# distribute this software, either in source code form or as a compiled
# binary, for any purpose, commercial or non-commercial, and by any

tenderlove

[aaron@tc-lan-adapter ~]$ cat x.rb
require "rbconfig"

# Change the compiler to "aarons-compiler"
RbConfig::CONFIG["CC"] = "aarons-compiler"
[aaron@tc-lan-adapter ~]$ RUBYOPT='-I/Users/aaron -rx' gem install sqlite3
Building native extensions. This could take a while...
ERROR:  Error installing sqlite3:
	ERROR: Failed to build gem native extension.

tenderlove

tenderlove

    page_body = (struct heap_page_body *)rb_aligned_malloc(HEAP_PAGE_ALIGN, HEAP_PAGE_SIZE);

    /* cut.. */

    page = calloc1(sizeof(struct heap_page));

    /* cut.. */

    assert((getpagesize() * 4) == HEAP_PAGE_ALIGN);
    intptr_t page_body_end = (intptr_t)page_body + (getpagesize() * 4);

tenderlove

    page_body = (struct heap_page_body *)rb_aligned_malloc(HEAP_PAGE_ALIGN, HEAP_PAGE_SIZE);

    /* cut.. */

    page = calloc1(sizeof(struct heap_page));

tenderlove

def segv_handler(info)
  # Only triggered if someone tried to read from a MOVED location
  move_all_objects_back(find_page(info.read_address))
end

def compact
  register_segv_handler :segv_handler

  ruby_heap.pages.each do |page|
    move_objects_on(page)

tenderlove

    REQUIRED_SIZE_BY_MALLOC = (sizeof(size_t) * 5),
    HEAP_PAGE_SIZE = (HEAP_PAGE_ALIGN - REQUIRED_SIZE_BY_MALLOC),