Module: T::Private::Methods

Defined in:
lib/types/private/methods/_methods.rb,
lib/types/private/methods/decl_builder.rb

Overview

typed: true

Defined Under Namespace

Modules: ARG_NOT_PROVIDED, CallValidation, MethodHooks, Modes, PROC_TYPE, SignatureValidation, SingletonMethodHooks Classes: DeclBuilder, Declaration, DeclarationBlock, Signature

Constant Summary collapse

TOP_SELF =

This has to be here, and can’t be nested inside ‘T::Private::Methods`, because the value of `self` depends on lexical (nesting) scope, and we specifically need a reference to the file-level self, i.e. `main:Object`

self

Class Method Summary collapse

Class Method Details

._check_final_ancestors(target, source_method_names, source) ⇒ Object

when target includes a module with instance methods source_method_names, ensure there is zero intersection between the final instance methods of target and source_method_names. so, for every m in source_method_names, check if there is already a method defined on one of target_ancestors with the same name that is final.

we assume that source_method_names has already been filtered to only include method names that were declared final at one point.



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# File 'lib/types/private/methods/_methods.rb', line 217

def self._check_final_ancestors(target, source_method_names, source)
  source_ancestors = nil
  if T::Private::IS_TYPECHECKING
    # Need to avoid a pinning error, but don't want to use runtime types in _methods.rb
    source_ancestors = T.let(nil, T.nilable(T::Array[T::Module[T.anything]]))
  end
  # use reverse_each to check farther-up ancestors first, for better error messages.
  target.ancestors.reverse_each do |ancestor|
    final_methods = @modules_with_final.fetch(ancestor, nil)
    # In this case, either ancestor didn't have any final methods anywhere in its
    # ancestor chain, or ancestor did have final methods somewhere in its ancestor
    # chain, but no final methods defined in ancestor itself.  Either way, there
    # are no final methods to check here, so we can move on to the next ancestor.
    next unless final_methods
    source_method_names.each do |method_name|
      next unless final_methods.include?(method_name)

      # If we get here, we are defining a method that some ancestor declared as
      # final.  however, we permit a final method to be defined multiple
      # times if it is the same final method being defined each time.
      if source
        if !source_ancestors
          source_ancestors = source.ancestors
          # filter out things without actual final methods just to make sure that
          # the below checks (which should be uncommon) go as quickly as possible.
          source_ancestors.select! do |a|
            @modules_with_final.fetch(a, nil)
          end
        end
        # final-ness means that there should be no more than one index for which
        # the below block returns true.
        defining_ancestor_idx = source_ancestors.index do |a|
          @modules_with_final.fetch(a).include?(method_name)
        end
        next if defining_ancestor_idx && source_ancestors[defining_ancestor_idx] == ancestor
      end

      final_sig = T::Private::Methods.signature_for_method(ancestor.instance_method(method_name))
      definition_file, definition_line = final_sig&.method&.source_location
      is_redefined = target == ancestor
      caller_loc = T::Private::CallerUtils.find_caller { |loc| !loc.path.to_s.start_with?(SORBET_RUNTIME_LIB_PATH) }
      extra_info = "\n"
      if caller_loc
        extra_info = (is_redefined ? "Redefined" : "Overridden") + " here: #{caller_loc.path}:#{caller_loc.lineno}\n"
      end

      error_message = "The method `#{method_name}` on #{ancestor} was declared as final and cannot be " +
                      (is_redefined ? "redefined" : "overridden in #{target}")
      pretty_message = "#{error_message}\n" \
                       "Made final here: #{definition_file}:#{definition_line}\n" \
                       "#{extra_info}"

      begin
        raise pretty_message
      rescue => e
        # sig_validation_error_handler raises by default; on the off chance that
        # it doesn't raise, we need to ensure that the rest of signature building
        # sees a consistent state.  This sig failed to validate, so we should get
        # rid of it.  If we don't do this, errors of the form "You called sig
        # twice without declaring a method in between" will non-deterministically
        # crop up in tests.
        T::Private::DeclState.current.reset!
        T::Configuration.sig_validation_error_handler(e, {})
      end
    end
  end
end

._handle_missing_method_signature(receiver, original_method, callee) ⇒ Object 



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# File 'lib/types/private/methods/_methods.rb', line 386

def self._handle_missing_method_signature(receiver, original_method, callee)
  method_sig = T::Private::Methods.signature_for_method(original_method)
  if !method_sig
    raise "`sig` not present for method `#{callee}` on #{receiver.inspect} but you're trying to run it anyways. " \
      "This should only be executed if you used `alias_method` to grab a handle to a method after `sig`ing it, but that clearly isn't what you are doing. " \
      "Maybe look to see if an exception was thrown in your `sig` lambda or somehow else your `sig` wasn't actually applied to the method."
  end

  if receiver.class <= original_method.owner
    receiving_class = receiver.class
  elsif receiver.singleton_class <= original_method.owner
    receiving_class = receiver.singleton_class
  elsif receiver.is_a?(Module) && receiver <= original_method.owner
    receiving_class = receiver
  else
    raise "#{receiver} is not related to #{original_method} - how did we get here?"
  end

  # Check for a case where `alias` or `alias_method` was called for a
  # method which had already had a `sig` applied. In that case, we want
  # to avoid hitting this slow path again, by moving to a faster validator
  # just like we did or will for the original method.
  #
  # If this isn't an `alias` or `alias_method` case, we're probably in the
  # middle of some metaprogramming using a Method object, e.g. a pattern like
  # `arr.map(&method(:foo))`. There's nothing really we can do to optimize
  # that here.
  receiving_method = receiving_class.instance_method(callee)
  if receiving_method != original_method && receiving_method.original_name == original_method.name
    aliasing_mod = receiving_method.owner
    method_sig = method_sig.as_alias(callee)
    unwrap_method(aliasing_mod, method_sig, original_method)
  end

  method_sig
end

._hook_impl(target, source) ⇒ Object

the module target is adding the methods from the module source to itself. we need to check that for all instance methods M on source, M is not defined on any of target’s ancestors.



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# File 'lib/types/private/methods/_methods.rb', line 607

def self._hook_impl(target, source)
  # we do not need to call add_was_ever_final here, because we have already marked
  # any such methods when source was originally defined.
  if !@modules_with_final.include?(target)
    if !@modules_with_final.include?(source)
      return
    end
    # Side-effectfully initialize the value if it's not already there
    @modules_with_final[target]
    install_hooks(target)
    return
  end

  methods = source.instance_methods
  methods.select! do |method_name|
    @was_ever_final_names.include?(method_name)
  end
  if methods.empty?
    return
  end

  _check_final_ancestors(target, methods, source)
end

._on_method_added(hook_mod, mod, method_name) ⇒ Object

Only public because it needs to get called below inside the replace_method blocks below.



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# File 'lib/types/private/methods/_methods.rb', line 299

def self._on_method_added(hook_mod, mod, method_name)
  if T::Private::DeclState.current.skip_on_method_added
    return
  end

  current_declaration = T::Private::DeclState.current.consume!

  if T::Private::Final.final_module?(mod) && (current_declaration.nil? || !current_declaration.final)
    raise "#{mod} was declared as final but its method `#{method_name}` was not declared as final"
  end
  # Don't compute mod.ancestors if we don't need to bother checking final-ness.
  if @was_ever_final_names.include?(method_name) && @modules_with_final.include?(mod)
    _check_final_ancestors(mod, [method_name], nil)
    # We need to fetch the active declaration again, as _check_final_ancestors
    # may have reset it (see the comment in that method for details).
    current_declaration = T::Private::DeclState.current.active_declaration
  end

  if current_declaration.nil?
    return
  end

  current_declaration.method_name = method_name

  if method_name == :method_added || method_name == :singleton_method_added
    raise(
      "Putting a `sig` on `#{method_name}` is not supported" \
      " (sorbet-runtime uses this method internally to perform `sig` validation logic)"
    )
  end

  # We allow `sig` in the current module's context (normal case) and
  if hook_mod != current_declaration.mod &&
     # inside `class << self`, and
     hook_mod.singleton_class != current_declaration.mod &&
     # on `self` at the top level of a file
     current_declaration.mod != TOP_SELF
    raise "A method (#{method_name}) is being added on a different class/module (#{hook_mod}) than the " \
          "last call to `sig` (#{current_declaration.mod}). Make sure each call " \
          "to `sig` is immediately followed by a method definition on the same " \
          "class/module."
  end
  # Overwrite the DeclarationBlock mod with `mod`, which is the Module that owns the method.
  current_declaration.mod = mod

  original_method = mod.instance_method(method_name)
  sig_block = lambda do
    T::Private::Methods.run_sig(method_name, original_method, current_declaration)
  end

  # Always replace the original method with this wrapper,
  # which is called only on the *first* invocation.
  # This wrapper is very slow, so it will subsequently re-wrap with a much faster wrapper
  # (or unwrap back to the original method).
  key = method_owner_and_name_to_key(mod, method_name)
  T::Private::ClassUtils.replace_method(original_method, mod, method_name) do |*args, &blk|
    method_sig = T::Private::Methods.maybe_run_sig_block_for_key(key)
    method_sig ||= T::Private::Methods._handle_missing_method_signature(
      self,
      original_method,
      __callee__ || raise("Unknown __callee__ for method without a signature"),
    )

    # Should be the same logic as CallValidation.wrap_method_if_needed but we
    # don't want that extra layer of indirection in the callstack
    if method_sig.mode == T::Private::Methods::Modes.abstract
      # We're in an interface method, keep going up the chain
      if defined?(super)
        super(*args, &blk)
      else
        raise NotImplementedError.new("The method `#{method_sig.method_name}` on #{mod} is declared as `abstract`. It does not have an implementation.")
      end
    # Note, this logic is duplicated (intentionally, for micro-perf) at `CallValidation.wrap_method_if_needed`,
    # make sure to keep changes in sync.
    elsif method_sig.check_level == :always || (method_sig.check_level == :tests && T::Private::RuntimeLevels.check_tests?)
      CallValidation.validate_call(self, original_method, method_sig, args, blk)
    else
      original_method.bind_call(self, *args, &blk)
    end
  end

  @sig_wrappers[key] = sig_block
  if current_declaration.final
    add_module_with_final_method(mod, method_name)
  end
end

.add_module_with_final_method(mod, method_name) ⇒ Object 



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# File 'lib/types/private/methods/_methods.rb', line 285

def self.add_module_with_final_method(mod, method_name)
  @was_ever_final_names[method_name] = true

  # Side-effectfully initializes the value if it's not already there
  methods = @modules_with_final[mod]
  if methods.nil?
    methods = {}
    @modules_with_final[mod] = methods
  end
  methods[method_name] = true
  nil
end

.all_checked_tests_sigs ⇒ Object 



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# File 'lib/types/private/methods/_methods.rb', line 601

def self.all_checked_tests_sigs
  @signatures_by_method.values.select { |sig| sig.check_level == :tests }
end

.build_sig(method_name, original_method, current_declaration) ⇒ Object 



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# File 'lib/types/private/methods/_methods.rb', line 474

def self.build_sig(method_name, original_method, current_declaration)
  begin
    signature = Signature.new(
      method: original_method,
      method_name: method_name,
      raw_arg_types: current_declaration.params,
      raw_return_type: current_declaration.returns,
      bind: current_declaration.bind,
      mode: current_declaration.mode,
      check_level: current_declaration.checked,
      on_failure: current_declaration.on_failure,
      override_allow_incompatible: current_declaration.override_allow_incompatible,
      defined_raw: current_declaration.raw,
    )

    SignatureValidation.validate(signature)
    signature
  rescue => e
    super_method = original_method.super_method
    super_signature = signature_for_method(super_method) if super_method

    T::Configuration.sig_validation_error_handler(
      e,
      method: original_method,
      declaration: current_declaration,
      signature: signature,
      super_signature: super_signature
    )

    Signature.new_untyped(method: original_method)
  end
end

.declare_abstract(mod, method_name) ⇒ Object 



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# File 'lib/types/private/methods/_methods.rb', line 97

def self.declare_abstract(mod, method_name)
  previous_declaration = ensure_valid_declare_dsl!(mod, method_name, :abstract)
  return unless previous_declaration

  if previous_declaration.abstract
    raise DeclBuilder::BuilderError.new("Cannot call `abstract` twice for the method `#{method_name}`")
  end

  previous_declaration.abstract = true

  # # TODO(jez) In the future, we will want some logic like this, but ONLY if
  # # the method did not have a sig. The first-call sig wrapper is normally in
  # # charge of running the sig block (even for abstract methods) If we know
  # # for sure that we're not going to have a sig, but we want the runtime
  # # `super` logic (possibly because there is an RBS method annotation), we
  # # are safe to eagerly call `create_abstract_wrapper` to overwrite the
  # # user's method.
  # #
  # # (Omitting this until we support DSL methods without runtime `sig`'s)
  # original_visibility = T::Private::ClassUtils.visibility_method_name(mod, method_name)
  # T::Private::Methods::CallValidation.create_abstract_wrapper(mod, method_name, original_visibility)

  nil
end

.declare_final(mod, method_name) ⇒ Object 



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# File 'lib/types/private/methods/_methods.rb', line 142

def self.declare_final(mod, method_name)
  previous_declaration = ensure_valid_declare_dsl!(mod, method_name, :final)
  return unless previous_declaration

  if previous_declaration.final
    raise DeclBuilder::BuilderError.new("Cannot declare `#{method_name}` final twice (from `sig(:final)` nor `final def`)")
  end

  previous_declaration.final = true

  # Register final bookkeeping that _on_method_added would have done if it
  # had seen final=true at that time. Use previous_declaration.mod (the actual
  # method owner, which is the singleton_class for `def self.foo`).
  add_module_with_final_method(previous_declaration.mod, method_name)

  nil
end

.declare_overridable(mod, method_name) ⇒ Object 



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# File 'lib/types/private/methods/_methods.rb', line 160

def self.declare_overridable(mod, method_name)
  previous_declaration = ensure_valid_declare_dsl!(mod, method_name, :overridable)
  return unless previous_declaration

  if previous_declaration.overridable
    raise DeclBuilder::BuilderError.new("Cannot call `overridable` twice for the method `#{method_name}`")
  end

  previous_declaration.overridable = true

  nil
end

.declare_override(mod, method_name, allow_incompatible:) ⇒ Object 



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# File 'lib/types/private/methods/_methods.rb', line 122

def self.declare_override(mod, method_name, allow_incompatible:)
  previous_declaration = ensure_valid_declare_dsl!(mod, method_name, :override)
  return unless previous_declaration

  if previous_declaration.override
    raise DeclBuilder::BuilderError.new("Cannot call `override` twice for the method `#{method_name}`")
  end

  method = mod.instance_method(method_name)
  super_method = method.super_method
  if super_method.nil?
    source_loc = Kernel.caller_locations(2, 1)&.map { |loc| [loc.path || "<unknown>", loc.lineno] }&.first
    T::Private::Methods::SignatureValidation.validate_non_override_mode(Modes.override, method_name, method, source_loc)
  end

  previous_declaration.override = {allow_incompatible: allow_incompatible}

  nil
end

.declare_sig(mod, loc, arg, &blk) ⇒ Object 



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# File 'lib/types/private/methods/_methods.rb', line 53

def self.declare_sig(mod, loc, arg, &blk)
  if T::Private::DeclState.current.active_declaration
    T::Private::DeclState.current.reset!
    raise "You called sig twice without declaring a method in between"
  end

  if !arg.nil? && arg != :final
    raise "Invalid argument to `sig`: #{arg}"
  end

  method_name = nil # will be filled in once the next method is defined
  abstract = nil
  override = nil
  overridable = nil
  T::Private::DeclState.current.active_declaration = DeclarationBlock.new(mod, method_name, loc, blk, arg == :final, abstract, override, overridable)

  nil
end

.finalize_proc(decl) ⇒ Object 



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# File 'lib/types/private/methods/_methods.rb', line 181

def self.finalize_proc(decl)
  decl.finalized = true

  if decl.mode != Modes.standard
    raise "Procs cannot have override/abstract modifiers"
  end
  if decl.mod != PROC_TYPE
    raise "You are passing a DeclBuilder as a type. Did you accidentally use `self` inside a `sig` block? Perhaps you wanted the `T.self_type` instead: https://sorbet.org/docs/self-type"
  end
  if decl.returns == ARG_NOT_PROVIDED
    raise "Procs must specify a return type"
  end
  if decl.on_failure != ARG_NOT_PROVIDED
    raise "Procs cannot use .on_failure"
  end

  if decl.params == ARG_NOT_PROVIDED
    decl.params = {}
  end

  T::Types::Proc.new(decl.params, decl.returns)
end

.has_sig_block_for_method(method) ⇒ Object 



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# File 'lib/types/private/methods/_methods.rb', line 525

def self.has_sig_block_for_method(method)
  has_sig_block_for_key(method_to_key(method))
end

.install_hooks(mod) ⇒ Object

Normally, this should be taken care of by simply ‘extend T::Sig`.

But there are a few cases where we actually want the hooks to be “viral” for final modules and final methods, such that we actually want to forcibly install the hooks even if they would not have naturally been there via inheritance.

As such, we don’t have to handle quite as many edge cases as ‘lib/types/sig.rb` does



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# File 'lib/types/private/methods/_methods.rb', line 691

def self.install_hooks(mod)
  return if @installed_hooks.include?(mod)
  @installed_hooks[mod] = true

  # See https://github.com/sorbet/sorbet/pull/3964 for an explanation of why this
  # check (which theoretically should not be needed) is actually needed.
  if !mod.is_a?(Module)
    return
  end

  if mod.singleton_class?
    mod.include(SingletonMethodHooks)
  else
    mod.extend(MethodHooks)
  end
  mod.extend(SingletonMethodHooks)
end

.maybe_run_sig_block_for_key(key) ⇒ Object

Only public so that it can be accessed in the closure for _on_method_added



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# File 'lib/types/private/methods/_methods.rb', line 538

def self.maybe_run_sig_block_for_key(key)
  run_sig_block_for_key(key) if has_sig_block_for_key(key)
end

.maybe_run_sig_block_for_method(method) ⇒ Object 



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# File 'lib/types/private/methods/_methods.rb', line 533

def self.maybe_run_sig_block_for_method(method)
  maybe_run_sig_block_for_key(method_to_key(method))
end

.run_all_sig_blocks(force_type_init: true) ⇒ Object 



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# File 'lib/types/private/methods/_methods.rb', line 588

def self.run_all_sig_blocks(force_type_init: true)
  loop do
    first_wrapper = @sig_wrappers.first
    break unless first_wrapper
    key, = first_wrapper
    run_sig_block_for_key(key, force_type_init: force_type_init)
  end

  # Make sure that there are no lingering declaration blocks being kept alive
  # (so we're not retaining any extra references for a possible GC)
  T::Private::DeclState.current.reset!
end

.run_builder(declaration_block) ⇒ Object 



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# File 'lib/types/private/methods/_methods.rb', line 455

def self.run_builder(declaration_block)
  blk_or_decl = declaration_block.blk_or_decl
  return blk_or_decl if blk_or_decl.is_a?(Declaration)
  if blk_or_decl.nil?
    raise "DeclarationBlock for #{declaration_block.mod} at #{declaration_block.loc} should have already been unwrapped"
  end

  builder = DeclBuilder.new(
    declaration_block.mod,
    declaration_block.abstract,
    declaration_block.override,
    declaration_block.overridable
  )
  decl = builder.instance_exec(&blk_or_decl).finalize!.decl
  # Record that we've already run `blk` once and constructed a `Declaration`
  declaration_block.blk_or_decl = decl
  decl
end

.run_sig(method_name, original_method, declaration_block) ⇒ Object

Executes the ‘sig` block, and converts the resulting Declaration to a Signature.



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# File 'lib/types/private/methods/_methods.rb', line 425

def self.run_sig(method_name, original_method, declaration_block)
  current_declaration =
    begin
      run_builder(declaration_block)
    rescue DeclBuilder::BuilderError => e
      T::Configuration.sig_builder_error_handler(e, declaration_block.loc)
      nil
    end

  # Release location information sooner
  declaration_block.loc = nil

  signature =
    if current_declaration
      build_sig(method_name, original_method, current_declaration)
    else
      Signature.new_untyped(method: original_method)
    end

  unwrap_method(signature.method.owner, signature, original_method)

  # Drop this declaration. Only drop it after we've actually wrapped the
  # method and recorded the signature, because that might raise an exception,
  # leaving the declaration in a weird state if the program rescues that
  # exception and continues.
  declaration_block.blk_or_decl = nil

  signature
end

.run_sig_block_for_method(method) ⇒ Object 



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# File 'lib/types/private/methods/_methods.rb', line 542

def self.run_sig_block_for_method(method)
  run_sig_block_for_key(method_to_key(method))
end

.set_final_checks_on_hooks(enable) ⇒ Object 



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# File 'lib/types/private/methods/_methods.rb', line 631

def self.set_final_checks_on_hooks(enable)
  is_enabled = !@old_hooks.nil?
  if enable == is_enabled
    return
  end
  if is_enabled
    # A cut-down version of T::Private::ClassUtils::ReplacedMethod#restore, because we
    # should only be resetting final hooks during tests.
    T::Configuration.without_ruby_warnings do
      Module.define_method(:included, @old_hooks[0])
      Module.define_method(:extended, @old_hooks[1])
      Class.define_method(:inherited, @old_hooks[2])
    end
    @old_hooks = nil
  else
    # Grab the original methods before replacing them, so that each block
    # closure can reference a variable that is already assigned.
    # (Do this directly, to avoid pinning errors)
    old_included = Module.instance_method(:included)
    T::Private::ClassUtils.replace_method(old_included, Module, :included) do |arg|
      old_included.bind_call(self, arg)
      ::T::Private::Methods._hook_impl(arg, self)
    end
    old_extended = Module.instance_method(:extended)
    T::Private::ClassUtils.replace_method(old_extended, Module, :extended) do |arg|
      old_extended.bind_call(self, arg)
      ::T::Private::Methods._hook_impl(arg.singleton_class, self)
    end
    old_inherited = Class.instance_method(:inherited)
    T::Private::ClassUtils.replace_method(old_inherited, Class, :inherited) do |arg|
      old_inherited.bind_call(self, arg)
      ::T::Private::Methods._hook_impl(arg, self)
      ::T::Private::Methods._hook_impl(arg.singleton_class, self.singleton_class)
    end
    @old_hooks = [old_included, old_extended, old_inherited]
  end
end

.signature_for_method(method) ⇒ T::Private::Methods::Signature

Returns the signature for a method whose definition was preceded by ‘sig`.

Parameters:

  • method (UnboundMethod)

Returns:



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# File 'lib/types/private/methods/_methods.rb', line 511

def self.signature_for_method(method)
  signature_for_key(method_to_key(method))
end

.start_proc ⇒ Object 



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# File 'lib/types/private/methods/_methods.rb', line 173

def self.start_proc
  # abstract/override/overridable don't make sense on procs
  abstract = false
  override = nil
  overridable = false
  DeclBuilder.new(PROC_TYPE, abstract, override, overridable)
end