[PROF-11311] Remove datadog_profiling_loader

.github/labeler.yml

@@ -18,7 +18,7 @@ dev/testing:
 # Changes to Profiling
 profiling:
 - changed-files:
-  - any-glob-to-any-file: [ '{lib/datadog/profiling/**,ext/datadog_profiling_loader/**,ext/datadog_profiling_native_extension/**}' ]
+  - any-glob-to-any-file: [ '{lib/datadog/profiling/**,ext/datadog_profiling_native_extension/**}' ]
 
 # Changes to CI-App
 ci-app:

Rakefile

@@ -435,10 +435,6 @@ NATIVE_EXTS = [
     ext.ext_dir = 'ext/datadog_profiling_native_extension'
   end,
 
-  Rake::ExtensionTask.new("datadog_profiling_loader.#{RUBY_VERSION}_#{RUBY_PLATFORM}") do |ext|
-    ext.ext_dir = 'ext/datadog_profiling_loader'
-  end,
-
   Rake::ExtensionTask.new("libdatadog_api.#{RUBY_VERSION[/\d+.\d+/]}_#{RUBY_PLATFORM}") do |ext|
     ext.ext_dir = 'ext/libdatadog_api'
   end

datadog.gemspec

@@ -83,7 +83,6 @@ Gem::Specification.new do |spec|
 
   spec.extensions = [
     'ext/datadog_profiling_native_extension/extconf.rb',
-    'ext/datadog_profiling_loader/extconf.rb',
     'ext/libdatadog_api/extconf.rb'
   ]
 end

ext/datadog_profiling_native_extension/profiling.c

@@ -41,6 +41,12 @@ static VALUE _native_malloc_stats(DDTRACE_UNUSED VALUE _self);
 static VALUE _native_safe_object_info(DDTRACE_UNUSED VALUE _self, VALUE obj);
 
 void DDTRACE_EXPORT Init_datadog_profiling_native_extension(void) {
+  // The profiler still has a lot of limitations around being used in Ractors BUT for now we're choosing to take care of those
+  // on our side, rather than asking Ruby to block calling our APIs from Ractors.
+  #ifdef HAVE_RB_EXT_RACTOR_SAFE
+    rb_ext_ractor_safe(true);
+  #endif
+
   VALUE datadog_module = rb_define_module("Datadog");
   VALUE profiling_module = rb_define_module_under(datadog_module, "Profiling");
   VALUE native_extension_module = rb_define_module_under(profiling_module, "NativeExtension");

lib/datadog/profiling/load_native_extension.rb

@@ -1,41 +1,9 @@
 # frozen_string_literal: true
 
-# This file is used to load the profiling native extension. It works in two steps:
-#
-# 1. Load the datadog_profiling_loader extension. This extension will be used to load the actual extension, but in
-#    a special way that avoids exposing native-level code symbols. See `datadog_profiling_loader.c` for more details.
-#
-# 2. Use the Datadog::Profiling::Loader exposed by the datadog_profiling_loader extension to load the actual
-#    profiling native extension.
-#
-# All code on this file is on-purpose at the top-level; this makes it so this file is executed only once,
-# the first time it gets required, to avoid any issues with the native extension being initialized more than once.
-
 begin
-  require "datadog_profiling_loader.#{RUBY_VERSION}_#{RUBY_PLATFORM}"
+  require "datadog_profiling_native_extension.#{RUBY_VERSION}_#{RUBY_PLATFORM}"
 rescue LoadError => e
   raise LoadError,
     "Failed to load the profiling loader extension. To fix this, please remove and then reinstall datadog " \
     "(Details: #{e.message})"
 end
-
-extension_name = "datadog_profiling_native_extension.#{RUBY_VERSION}_#{RUBY_PLATFORM}"
-file_name = "#{extension_name}.#{RbConfig::CONFIG["DLEXT"]}"
-full_file_path = "#{__dir__}/../../#{file_name}"
-
-unless File.exist?(full_file_path)
-  extension_dir = Gem.loaded_specs["datadog"].extension_dir
-  candidate_path = "#{extension_dir}/#{file_name}"
-  if File.exist?(candidate_path)
-    full_file_path = candidate_path
-  else
-    # We found none of the files. This is unexpected. Let's go ahead anyway, the error is going to be reported further
-    # down anyway.
-  end
-end
-
-init_function_name = "Init_#{extension_name.split(".").first}"
-
-status, result = Datadog::Profiling::Loader._native_load(full_file_path, init_function_name)
-
-raise "Failure to load #{extension_name} due to #{result}" if status == :error