Module: MilkTea::Lowering::Resolve

Includes:
CompileTime::MethodFolding
Included in:
MilkTea::Lowerer
Defined in:
lib/milk_tea/core/lowering/resolve.rb

Defined Under Namespace

Classes: ConstFnLowerEvaluator

Constant Summary collapse

PASS_THROUGH_BUILTINS = 
{
  "fatal"         => :fatal,
  "ref_of"        => :ref_of,
  "const_ptr_of"   => :const_ptr_of,
  "read"          => :read,
  "ptr_of"        => :ptr_of,
  "get"           => :get,
}.freeze
COMPILE_TIME_BUILTINS = 
%w[
  field_of callable_of has_attribute attribute_of
].freeze

Instance Method Summary collapse

Methods included from CompileTime::MethodFolding

#comptime_call_return_type, #comptime_const_function_return?, #comptime_const_method_body, #comptime_expression_type, #comptime_folded_value?, #comptime_imported_value_type, #comptime_member_receiver_value, #comptime_method_binding, #comptime_method_binding_for_receiver, #comptime_methods_map_for_binding, #comptime_receiver_type, #comptime_struct_field_names

Instance Method Details

#aggregate_arithmetic_result_type(operator, left_type, right_type) ⇒ Object 



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# File 'lib/milk_tea/core/lowering/resolve.rb', line 1124

def aggregate_arithmetic_result_type(operator, left_type, right_type)
  if left_type.is_a?(Types::Vector) && right_type.is_a?(Types::Vector) && left_type.name == right_type.name
    return left_type
  end
  if left_type.is_a?(Types::Matrix) && right_type.is_a?(Types::Matrix) && left_type.name == right_type.name
    return left_type
  end
  if left_type.is_a?(Types::Quaternion) && right_type.is_a?(Types::Quaternion)
    return left_type
  end

  scalar_result = aggregate_scalar_result(left_type, right_type)
  return scalar_result if scalar_result

  case operator
  when "+", "-"
    nil
  when "*", "/"
    aggregate_scalar_result(right_type, left_type)
  else
    nil
  end
end

#aggregate_scalar_result(aggregate_type, scalar_type) ⇒ Object 



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# File 'lib/milk_tea/core/lowering/resolve.rb', line 1148

def aggregate_scalar_result(aggregate_type, scalar_type)
  return nil unless aggregate_type.is_a?(Types::Vector) || aggregate_type.is_a?(Types::Matrix)
  return nil unless scalar_type.is_a?(Types::Primitive) && scalar_type.numeric?

  aggregate_type
end

#analysis_for_module(module_name) ⇒ Object 



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# File 'lib/milk_tea/core/lowering/resolve.rb', line 2427

def analysis_for_module(module_name)
  @program.analyses_by_module_name.fetch(module_name)
end

#attribute_binding_supports_target?(binding, target) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/milk_tea/core/lowering/resolve.rb', line 2012

def attribute_binding_supports_target?(binding, target)
  binding && target && binding.targets.include?(attribute_target_kind(target))
end

#attribute_target_kind(target) ⇒ Object 



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# File 'lib/milk_tea/core/lowering/resolve.rb', line 2016

def attribute_target_kind(target)
  case target
  when Types::StructHandle then :struct
  when Types::FieldHandle then :field
  when Types::CallableHandle then :callable
  end
end

#binary_right_env(expression, env) ⇒ Object 



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# File 'lib/milk_tea/core/lowering/resolve.rb', line 963

def binary_right_env(expression, env)
  case expression.operator
  when "and"
    env_with_refinements(env, flow_refinements(expression.left, truthy: true, env:))
  when "or"
    env_with_refinements(env, flow_refinements(expression.left, truthy: false, env:))
  else
    env
  end
end

#binding_cstr_backed?(binding) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/milk_tea/core/lowering/resolve.rb', line 382

def binding_cstr_backed?(binding)
  binding && binding[:cstr_backed]
end

#binding_cstr_list_backed?(binding) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/milk_tea/core/lowering/resolve.rb', line 386

def binding_cstr_list_backed?(binding)
  binding && binding[:cstr_list_backed]
end

#build_direct_function_proc_invoke_function(source_expression, function_c_name, function_type, proc_type, invoke_c_name) ⇒ Object 



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# File 'lib/milk_tea/core/lowering/resolve.rb', line 78

def build_direct_function_proc_invoke_function(source_expression, function_c_name, function_type, proc_type, invoke_c_name)
  env = empty_env
  params = [IR::Param.new(name: "env", linkage_name: "__mt_proc_env", type: proc_env_pointer_type, pointer: false)]
  parameter_setup = []
  call_arguments = []

  proc_type.params.each_with_index do |param, index|
    linkage_name = c_local_name(param.name || "arg#{index}")
    if array_type?(param.type)
      input_linkage_name = "#{linkage_name}_input"
      params << IR::Param.new(name: param.name || "arg#{index}", linkage_name: input_linkage_name, type: param.type, pointer: false)
      env[:scopes].last[param.name || "arg#{index}"] = local_binding(type: param.type, linkage_name:, mutable: param.mutable, pointer: false)
      parameter_setup << IR::LocalDecl.new(
        name: param.name || "arg#{index}",
        linkage_name:,
        type: param.type,
        value: IR::Name.new(name: input_linkage_name, type: param.type, pointer: false),
      )
      call_arguments << IR::Name.new(name: linkage_name, type: param.type, pointer: false)
    else
      env[:scopes].last[param.name || "arg#{index}"] = local_binding(type: param.type, linkage_name:, mutable: param.mutable, pointer: false)
      params << IR::Param.new(name: param.name || "arg#{index}", linkage_name:, type: param.type, pointer: false)
      call_arguments << IR::Name.new(name: linkage_name, type: param.type, pointer: false)
    end
  end

  call = IR::Call.new(callee: function_c_name, arguments: call_arguments, type: proc_type.return_type)
  body = if proc_type.return_type == @ctx.types.fetch("void")
            parameter_setup + [IR::ExpressionStmt.new(expression: call), IR::ReturnStmt.new(value: nil)]
          else
            parameter_setup + [IR::ReturnStmt.new(value: call)]
          end

  IR::Function.new(name: invoke_c_name, linkage_name: invoke_c_name, params:, return_type: proc_type.return_type, body:, entry_point: false)
end

#builtin_attribute_binding(name) ⇒ Object 



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# File 'lib/milk_tea/core/lowering/resolve.rb', line 2053

def builtin_attribute_binding(name)
  Bindings.builtin_attribute_binding(name, @ctx.types)
end

#cast_expression(expression, target_type) ⇒ Object 



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# File 'lib/milk_tea/core/lowering/resolve.rb', line 1032

def cast_expression(expression, target_type)
  return expression if expression.type == target_type

  IR::Cast.new(target_type:, expression:, type: target_type)
end

#collect_type_substitutions(pattern_type, actual_type, substitutions, function_name) ⇒ Object 



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# File 'lib/milk_tea/core/lowering/resolve.rb', line 2322

def collect_type_substitutions(pattern_type, actual_type, substitutions, function_name)
  case pattern_type
  when Types::TypeVar
    existing = substitutions[pattern_type.name]
    if existing && existing != actual_type
      raise LoweringError.new("conflicting type argument #{pattern_type.name} for function #{function_name}: got #{existing} and #{actual_type}", line: 0, column: 0, path: @ctx.current_analysis_path)
    end

    substitutions[pattern_type.name] ||= actual_type
  when Types::Nullable
    candidate = actual_type.is_a?(Types::Nullable) ? actual_type.base : actual_type
    collect_type_substitutions(pattern_type.base, candidate, substitutions, function_name)
  when Types::GenericInstance
    if ref_type?(pattern_type) && !ref_type?(actual_type)
      collect_type_substitutions(referenced_type(pattern_type), actual_type, substitutions, function_name)
      return
    end

    if own_type?(actual_type) && (mutable_pointer_type?(pattern_type) || const_pointer_type?(pattern_type))
      collect_type_substitutions(pointee_type(pattern_type), owned_referent_type(actual_type), substitutions, function_name)
      return
    end

    return unless actual_type.is_a?(Types::GenericInstance)
    return unless actual_type.name == pattern_type.name && actual_type.arguments.length == pattern_type.arguments.length

    pattern_type.arguments.zip(actual_type.arguments).each do |expected_argument, actual_argument|
      next if expected_argument.is_a?(Types::LiteralTypeArg)

      collect_type_substitutions(expected_argument, actual_argument, substitutions, function_name)
    end
  when Types::Span
    return unless actual_type.is_a?(Types::Span)

    collect_type_substitutions(pattern_type.element_type, actual_type.element_type, substitutions, function_name)
  when Types::Task
    return unless actual_type.is_a?(Types::Task)

    collect_type_substitutions(pattern_type.result_type, actual_type.result_type, substitutions, function_name)
  when Types::Proc
    if task_root_proc_type?(pattern_type) && actual_type.is_a?(Types::Task)
      collect_type_substitutions(pattern_type.return_type, actual_type, substitutions, function_name)
      return
    end

    actual_params = case actual_type
                    when Types::Proc
                      return unless actual_type.params.length == pattern_type.params.length

                      actual_type.params
                    when Types::Function
                      return if actual_type.receiver_type || actual_type.variadic
                      return unless actual_type.params.length == pattern_type.params.length
                      return unless actual_type.params.zip(pattern_type.params).all? { |actual_param, expected_param| actual_param.mutable == expected_param.mutable }

                      actual_type.params
                    else
                      return
                    end

    pattern_type.params.zip(actual_params).each do |expected_param, actual_param|
      collect_type_substitutions(expected_param.type, actual_param.type, substitutions, function_name)
    end
    collect_type_substitutions(pattern_type.return_type, actual_type.return_type, substitutions, function_name)
  when Types::StructInstance
    return unless actual_type.is_a?(Types::StructInstance)
    return unless actual_type.definition == pattern_type.definition && actual_type.arguments.length == pattern_type.arguments.length

    pattern_type.arguments.zip(actual_type.arguments).each do |expected_argument, actual_argument|
      collect_type_substitutions(expected_argument, actual_argument, substitutions, function_name)
    end
  when Types::VariantInstance
    return unless actual_type.is_a?(Types::VariantInstance)
    return unless actual_type.definition == pattern_type.definition && actual_type.arguments.length == pattern_type.arguments.length

    pattern_type.arguments.zip(actual_type.arguments).each do |expected_argument, actual_argument|
      collect_type_substitutions(expected_argument, actual_argument, substitutions, function_name)
    end
  when Types::Function
    return unless actual_type.is_a?(Types::Function)
    return unless actual_type.params.length == pattern_type.params.length

    pattern_type.params.zip(actual_type.params).each do |expected_param, actual_param|
      collect_type_substitutions(expected_param.type, actual_param.type, substitutions, function_name)
    end
    collect_type_substitutions(pattern_type.return_type, actual_type.return_type, substitutions, function_name)
  end
end

#compile_time_const_value(expression, env: nil) ⇒ Object 



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# File 'lib/milk_tea/core/lowering/resolve.rb', line 1536

def compile_time_const_value(expression, env: nil)
  CompileTime.evaluate(
    expression,
    resolve_identifier: lambda do |identifier_expression|
      if env
        binding = lookup_value(identifier_expression.name, env)
        return binding[:const_value] unless binding&.fetch(:const_value, nil).nil?
      end

      value = resolve_current_module_const_value(identifier_expression.name)
      return value if value

      # Resolve a bare type-parameter name (e.g. `T`) to its substituted
      # concrete type so `inline if T == int` folds during lowering too.
      current_type_params[identifier_expression.name] || @ctx.types[identifier_expression.name]
    end,
    resolve_member_access: lambda do |member_access_expression|
      if (receiver_value = CompileTime.evaluate(
            member_access_expression.receiver,
            resolve_identifier: lambda do |identifier_expression|
              if env
                binding = lookup_value(identifier_expression.name, env)
                return binding[:const_value] unless binding&.fetch(:const_value, nil).nil?
              end
              resolve_current_module_const_value(identifier_expression.name)
            end,
            resolve_member_access: lambda { |ma| compile_time_const_value(ma, env:) },
            resolve_type_ref: lambda { |tr| resolve_type_ref(tr) },
            resolve_call: lambda { |ce| evaluate_compile_time_call(ce, env:) },
          ))
        case receiver_value
        when Types::FieldHandle
          case member_access_expression.member
          when "name" then next receiver_value.field_name
          when "type" then next receiver_value.struct_handle.struct_type.field(receiver_value.field_name)
          end
        when Types::MemberHandle
          case member_access_expression.member
          when "name" then next receiver_value.member_name
          when "value" then next receiver_value.member_value
          end
        when Hash
          next receiver_value[member_access_expression.member] if receiver_value.key?(member_access_expression.member)
        when Array
          if member_access_expression.member =~ /\A_(\d+)\z/
            next receiver_value[Regexp.last_match(1).to_i]
          end
          next receiver_value.length if member_access_expression.member == "len"
        when String
          next receiver_value.length if member_access_expression.member == "len"
        end
      end

      value = if member_access_expression.receiver.is_a?(AST::Identifier)
                resolve_imported_module_const_value(member_access_expression.receiver.name, member_access_expression.member)
              end
      next value unless value.nil?

      resolve_type_member_const_value(member_access_expression)
    end,
    resolve_type_ref: lambda do |type_ref|
      resolve_type_ref(type_ref)
    end,
    resolve_call: lambda do |call_expression|
      evaluate_compile_time_call(call_expression, env:)
    end,
  )
end

#compile_time_numeric_const_expression?(expression, env: nil) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/milk_tea/core/lowering/resolve.rb', line 1531

def compile_time_numeric_const_expression?(expression, env: nil)
  value = compile_time_const_value(expression, env:)
  value.is_a?(Integer) || value.is_a?(Float)
end

#comptime_block_context(initial_vars, variable_types) ⇒ Object 



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# File 'lib/milk_tea/core/lowering/resolve.rb', line 1849

def comptime_block_context(initial_vars, variable_types)
  ::MilkTea::CompileTime::BlockContext.new(ConstFnLowerEvaluator.new(self), initial_variables: initial_vars, variable_types: variable_types)
end

#comptime_const_function(name) ⇒ Object 



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# File 'lib/milk_tea/core/lowering/resolve.rb', line 1841

def comptime_const_function(name)
  @ctx.functions[name]
end

#comptime_eval(expression, _scopes) ⇒ Object 



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# File 'lib/milk_tea/core/lowering/resolve.rb', line 1845

def comptime_eval(expression, _scopes)
  compile_time_const_value(expression, env: empty_env)
end

#comptime_methods_map ⇒ Object 



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# File 'lib/milk_tea/core/lowering/resolve.rb', line 1821

def comptime_methods_map
  @ctx.methods
end

#comptime_methods_map_by_to_s(type) ⇒ Object 



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# File 'lib/milk_tea/core/lowering/resolve.rb', line 1825

def comptime_methods_map_by_to_s(type)
  entry = @ctx.methods.find { |k, _| k.to_s == type.to_s }
  entry&.last
end

#comptime_raise_error(error) ⇒ Object 



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# File 'lib/milk_tea/core/lowering/resolve.rb', line 1853

def comptime_raise_error(error)
  raise error
end

#comptime_scoped_value_type(name, ctx) ⇒ Object 



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# File 'lib/milk_tea/core/lowering/resolve.rb', line 1830

def comptime_scoped_value_type(name, ctx)
  return nil unless ctx

  binding = lookup_value(name, ctx)
  binding[:type] if binding && binding[:type]
end

#comptime_value_type(name) ⇒ Object 



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# File 'lib/milk_tea/core/lowering/resolve.rb', line 1837

def comptime_value_type(name)
  @ctx.values[name]&.type
end

#const_declaration_for_module(module_name, name) ⇒ Object

Raises:



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# File 'lib/milk_tea/core/lowering/resolve.rb', line 2449

def const_declaration_for_module(module_name, name)
  analysis = @program.analyses_by_module_name.fetch(module_name)
  declaration = analysis.ast.declarations.find { |decl| decl.is_a?(AST::ConstDecl) && decl.name == name }
  raise LoweringError.new("unknown constant #{analysis.module_name}.#{name}", line: 0, column: 0, path: @ctx.current_analysis_path) unless declaration

  declaration
end

#contextual_numeric_compatibility?(expression, actual_type, expected_type, env:, external_numeric: false, contextual_int_to_float: false) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/milk_tea/core/lowering/resolve.rb', line 164

def contextual_numeric_compatibility?(expression, actual_type, expected_type, env:, external_numeric: false, contextual_int_to_float: false)
  return true if exact_compile_time_numeric_compatibility?(actual_type, expression, expected_type, env:)
  return true if integer_to_char_compatibility?(actual_type, expected_type)
  return true if external_numeric && external_numeric_compatibility?(actual_type, expected_type)
  return true if contextual_int_to_float && contextual_int_to_float_compatibility?(actual_type, expected_type)

  false
end

#copy_cstr_metadata!(target_env, source_env) ⇒ Object 



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# File 'lib/milk_tea/core/lowering/resolve.rb', line 345

def copy_cstr_metadata!(target_env, source_env)
  trackable_binding_names(target_env).each do |name|
    binding = lookup_value(name, target_env)
    source_binding = lookup_value(name, source_env)
    next unless binding && source_binding

    replace_binding_cstr_metadata!(
      name,
      target_env,
      cstr_backed: binding_cstr_backed?(source_binding),
      cstr_list_backed: binding_cstr_list_backed?(source_binding),
    )
  end
end

#cstr_backed_expression?(expression, env) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/milk_tea/core/lowering/resolve.rb', line 173

def cstr_backed_expression?(expression, env)
  return true if infer_expression_type(expression, env:) == @ctx.types.fetch("cstr")

  case expression
  when AST::StringLiteral
    true
  when AST::Identifier
    binding_cstr_backed?(lookup_value(expression.name, env))
  when AST::IfExpr
    then_env = env_with_refinements(env, flow_refinements(expression.condition, truthy: true, env:))
    else_env = env_with_refinements(env, flow_refinements(expression.condition, truthy: false, env:))
    cstr_backed_expression?(expression.then_expression, then_env) &&
      cstr_backed_expression?(expression.else_expression, else_env)
  when AST::UnsafeExpr
    cstr_backed_expression?(expression.expression, env)
  else
    false
  end
rescue LoweringError
  false
end

#cstr_backed_storage_value?(type, expression, env) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/milk_tea/core/lowering/resolve.rb', line 221

def cstr_backed_storage_value?(type, expression, env)
  return false unless expression
  return true if type == @ctx.types.fetch("cstr")
  return false unless type == @ctx.types.fetch("str")

  cstr_backed_expression?(expression, env)
end

#cstr_list_backed_expression?(expression, env) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/milk_tea/core/lowering/resolve.rb', line 195

def cstr_list_backed_expression?(expression, env)
  actual_type = infer_expression_type(expression, env:)
  return false unless array_type?(actual_type)

  element_type = array_element_type(actual_type)
  return false unless element_type == @ctx.types.fetch("str") || element_type == @ctx.types.fetch("cstr")

  case expression
  when AST::Identifier
    binding_cstr_list_backed?(lookup_value(expression.name, env))
  when AST::Call
    expression.arguments.all? { |argument| cstr_backed_expression?(argument.value, env) }
  when AST::IfExpr
    then_env = env_with_refinements(env, flow_refinements(expression.condition, truthy: true, env:))
    else_env = env_with_refinements(env, flow_refinements(expression.condition, truthy: false, env:))
    cstr_list_backed_expression?(expression.then_expression, then_env) &&
      cstr_list_backed_expression?(expression.else_expression, else_env)
  when AST::UnsafeExpr
    cstr_list_backed_expression?(expression.expression, env)
  else
    false
  end
rescue LoweringError
  false
end

#cstr_list_backed_storage_value?(type, expression, env) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/milk_tea/core/lowering/resolve.rb', line 229

def cstr_list_backed_storage_value?(type, expression, env)
  return false unless expression
  return false unless cstr_list_trackable_type?(type)

  cstr_list_backed_expression?(expression, env)
end

#cstr_metadata_exit_envs_for_if_statement(statement, env) ⇒ Object 



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# File 'lib/milk_tea/core/lowering/resolve.rb', line 275

def cstr_metadata_exit_envs_for_if_statement(statement, env)
  false_refinements = {}
  exit_envs = []

  statement.branches.each do |branch|
    branch_env = env_with_refinements(env, false_refinements)
    true_refinements = merge_refinements(false_refinements, flow_refinements(branch.condition, truthy: true, env: branch_env))
    simulated = simulate_cstr_metadata_block(branch.body, env: env_with_refinements(env, true_refinements))
    exit_envs << simulated if simulated
    false_refinements = merge_refinements(false_refinements, flow_refinements(branch.condition, truthy: false, env: branch_env))
  end

  if statement.else_body
    simulated = simulate_cstr_metadata_block(statement.else_body, env: env_with_refinements(env, false_refinements))
    exit_envs << simulated if simulated
  else
    exit_envs << env
  end

  exit_envs
end

#current_type_params ⇒ Object 



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# File 'lib/milk_tea/core/lowering/resolve.rb', line 2466

def current_type_params
  @ctx.current_type_substitutions || {}
end

#direct_function_identity_expression?(expression, env) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/milk_tea/core/lowering/resolve.rb', line 28

def direct_function_identity_expression?(expression, env)
  case expression
  when AST::Identifier
    return false if lookup_value(expression.name, env)
    return false unless @ctx.functions.key?(expression.name)

    binding = @ctx.functions.fetch(expression.name)
    !binding.type_params.any? && !foreign_function_binding?(binding)
  when AST::MemberAccess
    return false unless expression.receiver.is_a?(AST::Identifier) && @ctx.imports.key?(expression.receiver.name)

    imported_module = @ctx.imports.fetch(expression.receiver.name)
    return false unless imported_module.functions.key?(expression.member)

    binding = imported_module.functions.fetch(expression.member)
    !binding.type_params.any? && !foreign_function_binding?(binding)
  when AST::Specialization
    callable_resolution = resolve_specialized_callable_binding(expression, env:)
    return false unless callable_resolution

    callable_kind, binding, = callable_resolution
    callable_kind == :function && !foreign_function_binding?(binding)
  else
    false
  end
end

#direct_function_to_proc_contextual_compatibility?(expression, actual_type, env:, expected_type:) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/milk_tea/core/lowering/resolve.rb', line 21

def direct_function_to_proc_contextual_compatibility?(expression, actual_type, env:, expected_type:)
  return false unless actual_type.is_a?(Types::Function) && proc_type?(expected_type)
  return false unless direct_function_identity_expression?(expression, env)

  function_type_matches_proc_type?(actual_type, expected_type)
end

#each_non_raw_module_analysis(&block) ⇒ Object 



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# File 'lib/milk_tea/core/lowering/resolve.rb', line 2436

def each_non_raw_module_analysis(&block)
  return @program.analyses_by_module_name.each_value.reject { |a| a.module_kind == :raw_module }.each unless block
  @program.analyses_by_module_name.each_value { |a| block.call(a) unless a.module_kind == :raw_module }
end

#each_raw_module_analysis(&block) ⇒ Object 



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# File 'lib/milk_tea/core/lowering/resolve.rb', line 2431

def each_raw_module_analysis(&block)
  return @program.analyses_by_module_name.each_value.select { |a| a.module_kind == :raw_module }.each unless block
  @program.analyses_by_module_name.each_value { |a| block.call(a) if a.module_kind == :raw_module }
end

#evaluate_attribute_arg_call(arguments, env:) ⇒ Object 



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# File 'lib/milk_tea/core/lowering/resolve.rb', line 1788

def evaluate_attribute_arg_call(arguments, env:)
  return nil unless reflection_positional_arguments?(arguments, 2)

  attribute_handle = compile_time_const_value(arguments.first.value, env:)
  return nil unless attribute_handle.is_a?(Types::AttributeHandle)

  param_name = reflection_identifier_name(arguments[1].value)
  return nil unless param_name && attribute_handle.argument_values

  attribute_handle.argument_values[param_name]
end

#evaluate_attribute_of_call(arguments, env:) ⇒ Object 



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# File 'lib/milk_tea/core/lowering/resolve.rb', line 1769

def evaluate_attribute_of_call(arguments, env:)
  return nil unless reflection_positional_arguments?(arguments, 2)

  target = evaluate_reflection_target_argument(arguments.first.value, env:)
  binding = resolve_attribute_name_argument(arguments[1].value)
  return nil unless attribute_binding_supports_target?(binding, target)

  application = find_attribute_application(target, binding)
  return nil unless application

  Types::AttributeHandle.new(
    binding.name,
    binding.module_name,
    target,
    binding.params,
    application.argument_values,
  )
end

#evaluate_attributes_of_call(arguments, env:) ⇒ Object 



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# File 'lib/milk_tea/core/lowering/resolve.rb', line 1722

def evaluate_attributes_of_call(arguments, env:)
  return nil unless reflection_positional_arguments?(arguments, 1) || reflection_positional_arguments?(arguments, 2)

  target = evaluate_reflection_target_argument(arguments.first.value, env:)
  return nil unless target

  if arguments.length == 2
    attribute_binding = resolve_attribute_name_argument(arguments[1].value)
    application = find_attribute_application(target, attribute_binding)
    return [] unless application

    [Types::AttributeHandle.new(
      attribute_binding.name,
      attribute_binding.module_name,
      target,
      attribute_binding.params,
      application.argument_values,
    )]
  else
    resolved_attribute_applications_for_target(target).map do |application|
      Types::AttributeHandle.new(
        application.binding.name,
        application.binding.module_name,
        target,
        application.binding.params,
        application.argument_values,
      )
    end
  end
end

#evaluate_callable_of_call(arguments) ⇒ Object 



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# File 'lib/milk_tea/core/lowering/resolve.rb', line 1753

def evaluate_callable_of_call(arguments)
  return nil unless reflection_positional_arguments?(arguments, 1)

  resolve_callable_handle_argument(arguments.first.value)
end

#evaluate_compile_time_call(expression, env:) ⇒ Object 



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# File 'lib/milk_tea/core/lowering/resolve.rb', line 1605

def evaluate_compile_time_call(expression, env:)
  case expression.callee
  when AST::MemberAccess
    if (method_binding = comptime_method_binding(expression.callee, env))
      receiver_value = comptime_member_receiver_value(expression.callee.receiver, env)
      return comptime_const_method_body(method_binding, expression.arguments, scopes: nil, receiver_value:)
    end
  when AST::Identifier
    case expression.callee.name
    when "field_of"
      evaluate_field_of_call(expression.arguments, env:)
    when "fields_of"
      evaluate_fields_of_call(expression.arguments, env:)
    when "callable_of"
      evaluate_callable_of_call(expression.arguments)
    when "has_attribute"
      evaluate_has_attribute_call(expression.arguments, env:)
    when "attribute_of"
      evaluate_attribute_of_call(expression.arguments, env:)
    when "members_of"
      evaluate_members_of_call(expression.arguments, env:)
    when "attributes_of"
      evaluate_attributes_of_call(expression.arguments, env:)
    else
      func = @ctx.functions[expression.callee.name]
      if func&.ast&.respond_to?(:const) && func.ast.const
        evaluate_const_function_body_lower(func, expression.arguments)
      else
        evaluate_type_returning_call(expression, env:)
      end
    end
  when AST::Specialization
    if expression.callee.callee.is_a?(AST::Identifier) && expression.callee.callee.name == "attribute_arg"
      evaluate_attribute_arg_call(expression.arguments, env:)
    else
      callee_name = expression.callee.callee.is_a?(AST::Identifier) ? expression.callee.callee.name : nil
      if callee_name == "array"
        values = []
        expression.arguments.each do |argument|
          val = compile_time_const_value(argument.value, env:)
          return nil unless val
          values << val
        end
        values
      elsif callee_name
        func = @ctx.functions[callee_name]
        if func&.ast&.respond_to?(:const) && func.ast.const
          evaluate_const_function_body_lower(func, expression.arguments)
        else
          evaluate_type_returning_call(expression, env:)
        end
      else
        evaluate_type_returning_call(expression, env:)
      end
    end
  end
end

#evaluate_const_function_body_lower(func, arguments) ⇒ Object 



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# File 'lib/milk_tea/core/lowering/resolve.rb', line 1800

def evaluate_const_function_body_lower(func, arguments)
  return nil unless func.ast.params.length == arguments.length

  initial_vars = {}
  func.ast.params.each_with_index do |param, idx|
    arg_expr = arguments[idx].value
    arg_value = compile_time_const_value(arg_expr, env: empty_env)
    return nil unless arg_value

    initial_vars[param.name] = arg_value
  end

  variable_types = func.body_params.each_with_object({}) do |param, acc|
    acc[param.name] = param.type
  end
  evaluator = ConstFnLowerEvaluator.new(self)
  ctx = CompileTime::BlockContext.new(evaluator, initial_variables: initial_vars, variable_types: variable_types)
  result = ctx.evaluate_block(func.ast.body, scopes: nil)
  result.is_a?(CompileTime::ReturnOutcome) ? result.value : result
end

#evaluate_field_of_call(arguments, env:) ⇒ Object 



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# File 'lib/milk_tea/core/lowering/resolve.rb', line 1690

def evaluate_field_of_call(arguments, env:)
  return nil unless reflection_positional_arguments?(arguments, 2)

  struct_handle = resolve_struct_handle_argument(arguments.first.value, env:)
  return nil unless struct_handle

  field_name = reflection_identifier_name(arguments[1].value)
  return nil unless field_name

  CompileTime::Reflection.core_field_handle(struct_handle, field_name)
end

#evaluate_fields_of_call(arguments, env:) ⇒ Object 



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# File 'lib/milk_tea/core/lowering/resolve.rb', line 1702

def evaluate_fields_of_call(arguments, env:)
  return nil unless reflection_positional_arguments?(arguments, 1)

  struct_handle = resolve_struct_handle_argument(arguments.first.value, env:)
  return nil unless struct_handle

  CompileTime::Reflection.core_field_handles(struct_handle)
end

#evaluate_has_attribute_call(arguments, env:) ⇒ Object 



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# File 'lib/milk_tea/core/lowering/resolve.rb', line 1759

def evaluate_has_attribute_call(arguments, env:)
  return nil unless reflection_positional_arguments?(arguments, 2)

  target = evaluate_reflection_target_argument(arguments.first.value, env:)
  binding = resolve_attribute_name_argument(arguments[1].value)
  return nil unless attribute_binding_supports_target?(binding, target)

  !find_attribute_application(target, binding).nil?
end

#evaluate_members_of_call(arguments, env:) ⇒ Object 



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# File 'lib/milk_tea/core/lowering/resolve.rb', line 1711

def evaluate_members_of_call(arguments, env:)
  return nil unless reflection_positional_arguments?(arguments, 1)

  type = resolve_type_expression(arguments.first.value)
  return nil unless type

  return nil unless type.is_a?(Types::Enum) || type.is_a?(Types::Flags)

  CompileTime::Reflection.core_member_handles(type)
end

#evaluate_reflection_target_argument(expression, env:) ⇒ Object 



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# File 'lib/milk_tea/core/lowering/resolve.rb', line 1899

def evaluate_reflection_target_argument(expression, env:)
  struct_handle = resolve_struct_handle_argument(expression, env:)
  return struct_handle if struct_handle

  value = compile_time_const_value(expression, env:)
  return value if value.is_a?(Types::FieldHandle) || value.is_a?(Types::CallableHandle)

  nil
end

#evaluate_type_returning_call(expression, env:) ⇒ Object 



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# File 'lib/milk_tea/core/lowering/resolve.rb', line 1663

def evaluate_type_returning_call(expression, env:)
  callee_name, type_args = extract_type_callee_info(expression)
  return nil unless callee_name

  CompileTime::Reflection.core_evaluate_type_returning(
    callee_name, type_args,
    evaluate_value: ->(v) { compile_time_const_value(v, env:) },
    resolve_type_ref: ->(tr) { resolve_type_ref(tr) },
    pointer_to: ->(t) { pointer_to(t) },
    const_pointer_to: ->(t) { const_pointer_to(t) },
    top_level_functions: ->(name) { nil },
    evaluate_type_returning_function_body: nil,
  )
end

#exact_compile_time_numeric_compatibility?(actual_type, expression, expected_type, env: nil) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/milk_tea/core/lowering/resolve.rb', line 390

def exact_compile_time_numeric_compatibility?(actual_type, expression, expected_type, env: nil)
  return false unless expected_type.is_a?(Types::Primitive) && expected_type.numeric?
  return false if actual_type.is_a?(Types::EnumBase)

  value = compile_time_const_value(expression, env:)
  return false unless value.is_a?(Numeric)

  numeric_constant_fits_type?(value, expected_type)
end

#external_numeric_assignment_target?(expression, env:) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/milk_tea/core/lowering/resolve.rb', line 400

def external_numeric_assignment_target?(expression, env:)
  case expression
  when AST::MemberAccess
    receiver_type = infer_field_receiver_type(expression.receiver, env:)
    receiver_type.respond_to?(:external) && receiver_type.external
  else
    false
  end
end

#extract_type_callee_info(expression) ⇒ Object 



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# File 'lib/milk_tea/core/lowering/resolve.rb', line 1678

def extract_type_callee_info(expression)
  if expression.is_a?(AST::Call) && expression.callee.is_a?(AST::Identifier)
    [expression.callee.name, nil]
  elsif expression.is_a?(AST::Specialization)
    if expression.callee.is_a?(AST::Identifier)
      [expression.callee.name, expression.arguments]
    elsif expression.callee.is_a?(AST::Specialization) && expression.callee.callee.is_a?(AST::Identifier)
      [expression.callee.callee.name, expression.callee.arguments]
    end
  end
end

#ffi_external_layout_root_type(type) ⇒ Object 



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# File 'lib/milk_tea/core/lowering/resolve.rb', line 1111

def ffi_external_layout_root_type(type)
  type = type.base while type.is_a?(Types::Nullable)
  return pointee_type(type) if pointer_type?(type)

  type
end

#find_attribute_application(target, binding) ⇒ Object 



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# File 'lib/milk_tea/core/lowering/resolve.rb', line 2043

def find_attribute_application(target, binding)
  resolved_attribute_applications_for_target(target).find do |application|
    same_attribute_binding?(application.binding, binding)
  end
end

#find_struct_decl_by_name(declarations, name) ⇒ Object 



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# File 'lib/milk_tea/core/lowering/resolve.rb', line 1956

def find_struct_decl_by_name(declarations, name)
  declarations.each do |decl|
    next unless decl.is_a?(AST::StructDecl)
    return decl if decl.name == name
    if decl.nested_types&.any?
      found = find_struct_decl_by_name(decl.nested_types, name)
      return found if found
    end
  end
  nil
end

#float_literal_expression?(expression) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/milk_tea/core/lowering/resolve.rb', line 986

def float_literal_expression?(expression)
  expression.is_a?(AST::FloatLiteral) ||
    (expression.is_a?(AST::UnaryOp) && ["+", "-"].include?(expression.operator) && float_literal_expression?(expression.operand))
end

#foreign_identity_projection_expression(expression, target_type) ⇒ Object 



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# File 'lib/milk_tea/core/lowering/resolve.rb', line 1073

def foreign_identity_projection_expression(expression, target_type)
  return expression if expression.type == target_type
  return cast_expression(expression, target_type) if foreign_identity_projection_cast_compatible?(expression.type, target_type)

  if foreign_identity_projection_reinterpret_compatible?(expression.type, target_type)
    record_external_layout_assertion(expression.type, target_type)
    return reinterpret_expression(expression, target_type)
  end

  nil
end

#function_type_for_name(name) ⇒ Object

Raises:



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# File 'lib/milk_tea/core/lowering/resolve.rb', line 1196

def function_type_for_name(name)
  binding = @ctx.functions.fetch(name)
  raise LoweringError.new("generic function #{name} cannot be used as a value", line: 0, column: 0, path: @ctx.current_analysis_path) if binding.type_params.any?
  raise LoweringError.new("foreign function #{name} cannot be used as a value", line: 0, column: 0, path: @ctx.current_analysis_path) if foreign_function_binding?(binding)

  binding.type
end

#harmonize_binary_float_literal_types(left_expression, right_expression, left_type, right_type, env:) ⇒ Object 



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# File 'lib/milk_tea/core/lowering/resolve.rb', line 974

def harmonize_binary_float_literal_types(left_expression, right_expression, left_type, right_type, env:)
  if float_literal_expression?(left_expression) && right_type.is_a?(Types::Primitive) && right_type.float?
    left_type = infer_expression_type(left_expression, env:, expected_type: right_type)
  end

  if float_literal_expression?(right_expression) && left_type.is_a?(Types::Primitive) && left_type.float?
    right_type = infer_expression_type(right_expression, env:, expected_type: left_type)
  end

  [left_type, right_type]
end

#harmonize_binary_integer_literal_types(left_expression, right_expression, left_type, right_type, env:) ⇒ Object 



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# File 'lib/milk_tea/core/lowering/resolve.rb', line 991

def harmonize_binary_integer_literal_types(left_expression, right_expression, left_type, right_type, env:)
  if integer_literal_expression?(left_expression) && right_type.is_a?(Types::Primitive) && right_type.integer?
    if exact_compile_time_numeric_compatibility?(left_type, left_expression, right_type, env:)
      left_type = infer_expression_type(left_expression, env:, expected_type: right_type)
    end
  end

  if integer_literal_expression?(right_expression) && left_type.is_a?(Types::Primitive) && left_type.integer?
    if exact_compile_time_numeric_compatibility?(right_type, right_expression, left_type, env:)
      right_type = infer_expression_type(right_expression, env:, expected_type: left_type)
    end
  end

  [left_type, right_type]
end

#imports_for_module(module_name) ⇒ Object 



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# File 'lib/milk_tea/core/lowering/resolve.rb', line 2445

def imports_for_module(module_name)
  @program.analyses_by_module_name.fetch(module_name).imports
end

#infer_binary_operand_types(expression, env:, expected_type: nil) ⇒ Object 



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# File 'lib/milk_tea/core/lowering/resolve.rb', line 944

def infer_binary_operand_types(expression, env:, expected_type: nil)
  propagated_type = propagating_expected_type(expression.operator, expected_type)
  left_type = infer_expression_type(expression.left, env:, expected_type: propagated_type)
  right_env = binary_right_env(expression, env)
  right_expected_type = case expression.operator
                        when "<<", ">>"
                          propagated_type || left_type
                        when "+", "-", "*", "/", "%"
                          propagated_type || left_type
                        when "|", "&", "^"
                          left_type
                        else
                          left_type
                        end
  right_type = infer_expression_type(expression.right, env: right_env, expected_type: right_expected_type)
  left_type, right_type = harmonize_binary_float_literal_types(expression.left, expression.right, left_type, right_type, env: right_env)
  harmonize_binary_integer_literal_types(expression.left, expression.right, left_type, right_type, env: right_env)
end

#infer_expression_type(expression, env:, expected_type: nil) ⇒ Object 



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# File 'lib/milk_tea/core/lowering/resolve.rb', line 701

def infer_expression_type(expression, env:, expected_type: nil)
  if !@bypass_sema_type_cache && expected_type.nil? && !expression.is_a?(AST::Identifier) && (id = @ctx.ast.node_ids[expression.object_id]) && (resolved = @ctx.resolved_expr_types[id])
    return resolved
  end

  case expression
  when AST::AwaitExpr
    task_type = infer_expression_type(expression.expression, env:)
    raise LoweringError.new("await requires a Task value, got #{task_type}", line: 0, column: 0, path: @ctx.current_analysis_path) unless task_type.is_a?(Types::Task)

    task_type.result_type
  when AST::IntegerLiteral
    if expected_type.is_a?(Types::Primitive) && expected_type.integer?
      expected_type
    else
      @ctx.types.fetch("int")
    end
  when AST::CharLiteral
    @ctx.types.fetch("ubyte")
  when AST::FloatLiteral
    if expression.lexeme.end_with?("f")
      @ctx.types.fetch("float")
    elsif expression.lexeme.end_with?("d")
      @ctx.types.fetch("double")
    elsif expected_type.is_a?(Types::Primitive) && expected_type.float?
      expected_type
    else
      @ctx.types.fetch("float")
    end
  when AST::SizeofExpr, AST::AlignofExpr, AST::OffsetofExpr
    @ctx.types.fetch("ptr_uint")
  when AST::StringLiteral
    @ctx.types.fetch(expression.cstring ? "cstr" : "str")
  when AST::FormatString
    @ctx.types.fetch("str")
  when AST::BooleanLiteral
    @ctx.types.fetch("bool")
  when AST::NullLiteral
    infer_null_literal_type(expression, expected_type)
  when AST::Identifier
    binding = lookup_value(expression.name, env)
    return binding[:type] if binding
    if (value_param_type = value_param_declared_type(expression.name))
      return value_param_type
    end
      return function_type_for_name(expression.name) if @ctx.functions.key?(expression.name)

      raise LoweringError.new("unknown identifier #{expression.name}", line: expression.line, column: expression.column, path: @ctx.current_analysis_path)
  when AST::MemberAccess
    if (type_expr = resolve_type_expression(expression.receiver))
      member_type = resolve_type_member(type_expr, expression.member)
      return member_type if member_type

      dispatch_receiver_type = method_dispatch_receiver_type(type_expr)
      method_entry_receiver_type = type_expr
      method_entry = @method_definitions[[type_expr, expression.member]]
      method_entry ||= @method_definitions[[type_expr, "static:#{expression.member}"]]
      unless method_entry || dispatch_receiver_type == type_expr
        method_entry_receiver_type = dispatch_receiver_type
        method_entry = @method_definitions[[dispatch_receiver_type, expression.member]]
        method_entry ||= @method_definitions[[dispatch_receiver_type, "static:#{expression.member}"]]
      end
      if method_entry
        method_analysis, method_ast = method_entry
        method_binding = method_analysis.methods.fetch(method_entry_receiver_type).fetch(method_analysis_key(method_ast))
        return method_binding.type if method_binding.type.receiver_type.nil?
      end
    end
    if expression.receiver.is_a?(AST::Identifier) && @ctx.imports.key?(expression.receiver.name)
      imported_module = @ctx.imports.fetch(expression.receiver.name)
      return imported_module.values.fetch(expression.member).type if imported_module.values.key?(expression.member)
      return imported_module.functions.fetch(expression.member).type if imported_module.functions.key?(expression.member)
    end
    receiver_type = infer_field_receiver_type(expression.receiver, env:)
    if (event_type = event_member_from_owner_type(receiver_type, expression.member))
      return event_type
    end

    if receiver_type == @ctx.types["field_handle"]
      return infer_field_handle_member_type(expression)
    end
    if receiver_type == @ctx.types["member_handle"]
      return infer_member_handle_member_type(expression)
    end

    return receiver_type.field(expression.member) if receiver_type.respond_to?(:field)
    raise LoweringError.new("unknown member #{expression.member}", line: expression.line, column: expression.column, path: @ctx.current_analysis_path)
  when AST::IndexAccess
    receiver_type = infer_expression_type(expression.receiver, env:)
    if expression.index.is_a?(AST::RangeExpr)
      return range_index_result_type(receiver_type)
    end
    index_type = infer_expression_type(expression.index, env:)
    infer_index_result_type(receiver_type, index_type)
  when AST::UnaryOp
    return infer_result_propagation_type(expression, env:) if expression.operator == "?"

    operand_type = infer_expression_type(expression.operand, env:, expected_type:)
    case expression.operator
    when "not"
      @ctx.types.fetch("bool")
    else
      operand_type
    end
  when AST::BinaryOp
    left_type, right_type = infer_binary_operand_types(expression, env:, expected_type: expected_type)

    case expression.operator
    when "and", "or", "<", "<=", ">", ">=", "==", "!="
      @ctx.types.fetch("bool")
    when "+", "-", "*", "/"
      aggregate_arithmetic_result_type(expression.operator, left_type, right_type) || pointer_arithmetic_result_type(expression.operator, left_type, right_type) || common_numeric_type(left_type, right_type) || left_type
    when "%"
      common_integer_type(left_type, right_type) || left_type
    else
      left_type
    end
  when AST::IfExpr
    then_env = env_with_refinements(env, flow_refinements(expression.condition, truthy: true, env:))
    else_env = env_with_refinements(env, flow_refinements(expression.condition, truthy: false, env:))
    then_type = infer_expression_type(expression.then_expression, env: then_env, expected_type: expected_type)
    else_type = infer_expression_type(expression.else_expression, env: else_env, expected_type: expected_type)

    if expected_type &&
        if_expression_branch_compatible?(then_type, expected_type) &&
        if_expression_branch_compatible?(else_type, expected_type)
      return expected_type
    end

    conditional_common_type(then_type, else_type) || raise(LoweringError, "if expression branches require compatible types, got #{then_type} and #{else_type}")
  when AST::MatchExpr
    scrutinee_type = infer_expression_type(expression.expression, env:)
    arm_types = expression.arms.map do |arm|
      arm_env = duplicate_env(env)
      if scrutinee_type.is_a?(Types::Variant) && arm.binding_name && !wildcard_arm_pattern?(arm.pattern)
        arm_name = variant_match_arm_name_from_pattern(arm.pattern)
        if arm_name && scrutinee_type.has_payload?(arm_name)
          fields = scrutinee_type.arm(arm_name)
          payload_type = Types::VariantArmPayload.new(scrutinee_type, arm_name, fields)
          arm_env[:scopes].last[arm.binding_name] = local_binding(type: payload_type, linkage_name: c_local_name(arm.binding_name), mutable: false, pointer: false)
        end
      end
      infer_expression_type(arm.value, env: arm_env, expected_type: expected_type)
    end

    if expected_type && arm_types.all? { |arm_type| if_expression_branch_compatible?(arm_type, expected_type) }
      return expected_type
    end

    common_type = arm_types.first
    arm_types.drop(1).each do |arm_type|
      common_type = conditional_common_type(common_type, arm_type) || raise(LoweringError, "match expression arms require compatible types, got #{common_type} and #{arm_type}")
    end
    common_type
  when AST::UnsafeExpr
    infer_expression_type(expression.expression, env:, expected_type:)
  when AST::ProcExpr
    resolve_type_ref(AST::ProcType.new(params: expression.params, return_type: expression.return_type))
  when AST::Call
    kind, _callee_name, _receiver, callee_type = resolve_callee(expression.callee, env, arguments: expression.arguments)
    case kind
    when :function, :method, :associated_method, :callable_value,
      :str_buffer_clear, :str_buffer_assign, :str_buffer_append, :str_buffer_assign_format, :str_buffer_append_format,
      :str_buffer_len, :str_buffer_capacity, :str_buffer_as_str, :str_buffer_as_cstr,
      :event_subscribe, :event_subscribe_once, :event_unsubscribe, :event_emit, :event_wait,
      :compile_time_builtin,
      :reinterpret, :zero, :hash, :equal, :order,
      :dyn_method
      callee_type.return_type
    when :struct_literal, :struct_with, :array, :simd, :variant_arm_ctor, :adapt
      callee_type
    when :ref_of
      argument_type = infer_expression_type(expression.arguments.fetch(0).value, env:)
      Types::Registry.generic_instance("ref", [argument_type])
    when :const_ptr_of
      argument_type = infer_expression_type(expression.arguments.fetch(0).value, env:)
      Types::Registry.generic_instance("const_ptr", [argument_type])
    when :read
      infer_value_type(expression.arguments.fetch(0).value, env:)
    when :ptr_of
      argument_type = infer_expression_type(expression.arguments.fetch(0).value, env:)
      if ref_type?(argument_type)
        Types::Registry.generic_instance("ptr", [referenced_type(argument_type)])
      else
        Types::Registry.generic_instance("ptr", [infer_expression_type(expression.arguments.fetch(0).value, env:, expected_type: expected_type && pointer_type?(expected_type) ? pointee_type(expected_type) : nil)])
      end
    when :array_as_span
      callee_type
    when :fatal
      @ctx.types.fetch("void")
    when :get
      receiver_type = infer_expression_type(expression.arguments.fetch(0).value, env:)
      elem_type = if array_type?(receiver_type)
                    array_element_type(receiver_type)
                  else
                    receiver_type.element_type
                  end
      Types::Registry.nullable(Types::Registry.generic_instance("ptr", [elem_type]))
    when :atomic_load, :atomic_add, :atomic_sub, :atomic_exchange, :atomic_store, :atomic_compare_exchange,
      :simd_lane_with
      callee_type.return_type
    else
      raise LoweringError.new("unsupported call kind #{kind}", line: 0, column: 0, path: @ctx.current_analysis_path)
    end
  when AST::PrefixCast
    resolve_type_ref(expression.target_type)
  when AST::Specialization
    if expression.callee.is_a?(AST::Identifier) && expression.callee.name == "zero"
      _, _, _, function_type = resolve_callee(expression, env, arguments: [])
      function_type.return_type
    elsif expression.callee.is_a?(AST::Identifier) && expression.callee.name == "default"
      resolve_default_specialization(expression, env:).target_type
    elsif (callable_resolution = resolve_specialized_callable_binding(expression, env:))
      callable_kind, function_binding, = callable_resolution
      raise LoweringError.new("specialized method must be called", line: 0, column: 0, path: @ctx.current_analysis_path) if callable_kind == :method

      function_binding.type
    else
      raise LoweringError.new("unsupported specialization", line: 0, column: 0, path: @ctx.current_analysis_path)
    end
  when AST::RangeExpr
    raise LoweringError.new("range expression is not valid in this context; use it as a for-loop iterable", line: 0, column: 0, path: @ctx.current_analysis_path)
  when AST::ExpressionList
    names = []
    element_types = []
    expression.elements.each do |element|
      if element.is_a?(AST::Argument)
        names << element.name
        element_types << infer_expression_type(element.value, env:)
      else
        names << nil
        element_types << infer_expression_type(element, env:)
      end
    end
    has_named = names.any?
    Types::Registry.tuple(element_types, field_names: has_named ? names : nil)
  when AST::DetachExpr
    Types::Handle.new
  else
    raise LoweringError.new("unsupported expression type #{expression.class.name}", line: 0, column: 0, path: @ctx.current_analysis_path)
  end
end

#infer_field_handle_member_type(expression) ⇒ Object 



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# File 'lib/milk_tea/core/lowering/resolve.rb', line 2634

def infer_field_handle_member_type(expression)
  case expression.member
  when "name" then @ctx.types["str"]
  when "type"
    handle = compile_time_const_value(expression.receiver, env: nil)
    return @error_type unless handle.is_a?(Types::FieldHandle)

    resolve_type_ref(handle.field_declaration.type)
  else
    @error_type
  end
end

#infer_function_type_arguments(binding, arguments, env, receiver_type: nil) ⇒ Object 



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# File 'lib/milk_tea/core/lowering/resolve.rb', line 2162

def infer_function_type_arguments(binding, arguments, env, receiver_type: nil)
  expected_params = binding.type.params
  unless call_arity_matches?(binding.type, arguments.length)
    raise LoweringError.new(arity_error_message(binding.type, binding.name, arguments.length), line: 0, column: 0, path: @ctx.current_analysis_path)
  end

  substitutions = infer_receiver_type_substitutions(binding, receiver_type)
  expected_params.each_with_index do |parameter, index|
    argument = arguments.fetch(index)
    candidate_type = substitute_type(parameter.type, substitutions)
    expected_argument_type = if callable_type?(candidate_type)
                                candidate_type
                              elsif contains_type_var?(candidate_type)
                                nil
                              else
                                candidate_type
                              end
    actual_type = infer_expression_type(argument.value, env:, expected_type: expected_argument_type)
    collect_type_substitutions(parameter.type, actual_type, substitutions, binding.name)
  end

  binding.type_params.map do |name|
    inferred = substitutions[name]
    raise LoweringError.new("cannot infer type argument #{name} for function #{binding.name}", line: 0, column: 0, path: @ctx.current_analysis_path) unless inferred

    inferred
  end
end

#infer_member_handle_member_type(expression) ⇒ Object 



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# File 'lib/milk_tea/core/lowering/resolve.rb', line 2647

def infer_member_handle_member_type(expression)
  case expression.member
  when "name" then @ctx.types["str"]
  when "value" then @ctx.types["int"]
  else @error_type
  end
end

#infer_null_literal_type(expression, expected_type) ⇒ Object 



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# File 'lib/milk_tea/core/lowering/resolve.rb', line 1118

def infer_null_literal_type(expression, expected_type)
  return Types::Null.new(resolve_type_ref(expression.type)) if expression.type

  expected_type || null_type
end

#infer_receiver_type_substitutions(binding, receiver_type) ⇒ Object 



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# File 'lib/milk_tea/core/lowering/resolve.rb', line 2236

def infer_receiver_type_substitutions(binding, receiver_type)
  declared_receiver_type = binding.declared_receiver_type
  return {} unless declared_receiver_type
  case declared_receiver_type
  when Types::Nullable
    unless receiver_type.is_a?(Types::Nullable)
      raise LoweringError.new("cannot use method #{binding.name} with receiver #{receiver_type}", line: 0, column: 0, path: @ctx.current_analysis_path)
    end

    infer_receiver_type_substitutions(
      binding.with(declared_receiver_type: declared_receiver_type.base),
      receiver_type.base,
    )
  when Types::StructInstance
    return {} unless declared_receiver_type.definition.is_a?(Types::GenericStructDefinition)

    unless receiver_type.is_a?(Types::StructInstance) && receiver_type.definition == declared_receiver_type.definition
      raise LoweringError.new("cannot use method #{binding.name} with receiver #{receiver_type}", line: 0, column: 0, path: @ctx.current_analysis_path)
    end

    declared_receiver_type.definition.type_params.zip(receiver_type.arguments).to_h
  when Types::VariantInstance
    return {} unless declared_receiver_type.definition.is_a?(Types::GenericVariantDefinition)

    unless receiver_type.is_a?(Types::VariantInstance) && receiver_type.definition == declared_receiver_type.definition
      raise LoweringError.new("cannot use method #{binding.name} with receiver #{receiver_type}", line: 0, column: 0, path: @ctx.current_analysis_path)
    end

    declared_receiver_type.definition.type_params.zip(receiver_type.arguments).to_h
  when Types::GenericInstance
    unless receiver_type.is_a?(Types::GenericInstance) && receiver_type.name == declared_receiver_type.name && receiver_type.arguments.length == declared_receiver_type.arguments.length
      raise LoweringError.new("cannot use method #{binding.name} with receiver #{receiver_type}", line: 0, column: 0, path: @ctx.current_analysis_path)
    end

    declared_receiver_type.arguments.zip(receiver_type.arguments).each_with_object({}) do |(declared_argument, actual_argument), substitutions|
      if declared_argument.is_a?(Types::TypeVar)
        substitutions[declared_argument.name] = actual_argument
      elsif declared_argument != actual_argument
        raise LoweringError.new("cannot use method #{binding.name} with receiver #{receiver_type}", line: 0, column: 0, path: @ctx.current_analysis_path)
      end
    end
  when Types::Span
    return {} unless receiver_type.is_a?(Types::Span)

    substitutions = {}
    if declared_receiver_type.element_type.is_a?(Types::TypeVar)
      substitutions[declared_receiver_type.element_type.name] = receiver_type.element_type
    elsif declared_receiver_type.element_type != receiver_type.element_type
      raise LoweringError.new("cannot use method #{binding.name} with receiver #{receiver_type}", line: 0, column: 0, path: @ctx.current_analysis_path)
    end
    substitutions
  when Types::Task
    return {} unless receiver_type.is_a?(Types::Task)

    substitutions = {}
    if declared_receiver_type.result_type.is_a?(Types::TypeVar)
      substitutions[declared_receiver_type.result_type.name] = receiver_type.result_type
    elsif declared_receiver_type.result_type != receiver_type.result_type
      raise LoweringError.new("cannot use method #{binding.name} with receiver #{receiver_type}", line: 0, column: 0, path: @ctx.current_analysis_path)
    end
    substitutions
  when Types::SoA
    return {} unless receiver_type.is_a?(Types::SoA)

    substitutions = {}
    if declared_receiver_type.element_type.is_a?(Types::TypeVar)
      substitutions[declared_receiver_type.element_type.name] = receiver_type.element_type
    elsif declared_receiver_type.element_type != receiver_type.element_type
      raise LoweringError.new("cannot use method #{binding.name} with receiver #{receiver_type}", line: 0, column: 0, path: @ctx.current_analysis_path)
    end
    substitutions
  when Types::Simd
    return {} unless receiver_type.is_a?(Types::Simd)

    substitutions = {}
    if declared_receiver_type.element_type.is_a?(Types::TypeVar)
      substitutions[declared_receiver_type.element_type.name] = receiver_type.element_type
    elsif declared_receiver_type.element_type != receiver_type.element_type
      raise LoweringError.new("cannot use method #{binding.name} with receiver #{receiver_type}", line: 0, column: 0, path: @ctx.current_analysis_path)
    end
    substitutions
  else
    {}
  end
end

#instantiate_function_binding(binding, type_arguments) ⇒ Object 



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# File 'lib/milk_tea/core/lowering/resolve.rb', line 2093

def instantiate_function_binding(binding, type_arguments)
  if binding.type_params.empty?
    raise LoweringError.new("function #{binding.name} is not generic and cannot be specialized", line: 0, column: 0, path: @ctx.current_analysis_path)
  end

  unless binding.type_params.length == type_arguments.length
    raise LoweringError.new("function #{binding.name} expects #{binding.type_params.length} type arguments, got #{type_arguments.length}", line: 0, column: 0, path: @ctx.current_analysis_path)
  end

  if type_arguments.any? { |type_argument| contains_ref_type?(type_argument) }
    raise LoweringError.new("generic function #{binding.name} cannot be instantiated with ref types", line: 0, column: 0, path: @ctx.current_analysis_path)
  end

  key = type_arguments.freeze
  return binding.instances.fetch(key) if binding.instances.key?(key)

  substitutions = binding.type_params.zip(type_arguments).to_h
  validate_function_type_param_constraints!(binding, substitutions)
  instance = Bindings::FunctionBinding.new(
    name: binding.name,
    type: substitute_type(binding.type, substitutions),
    body_params: binding.body_params.map { |param| substitute_value_binding(param, substitutions) },
    body_return_type: substitute_type(binding.body_return_type, substitutions),
    ast: binding.ast,
    external: binding.external,
    async: binding.async,
    type_params: [].freeze,
    type_param_constraints: {}.freeze,
    instances: {},
    type_arguments: key,
    owner: binding.owner,
    specialization_owner: nil,
    type_substitutions: substitutions.freeze,
    declared_receiver_type: binding.declared_receiver_type ? substitute_type(binding.declared_receiver_type, substitutions) : nil,
  )
  binding.instances[key] = instance
end

#instantiate_function_binding_with_receiver(binding, explicit_type_arguments, receiver_type: nil) ⇒ Object 



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# File 'lib/milk_tea/core/lowering/resolve.rb', line 2065

def instantiate_function_binding_with_receiver(binding, explicit_type_arguments, receiver_type: nil)
  if binding.type_params.empty?
    raise LoweringError.new("function #{binding.name} is not generic and cannot be specialized", line: 0, column: 0, path: @ctx.current_analysis_path)
  end

  receiver_substitutions = infer_receiver_type_substitutions(binding, receiver_type)
  remaining_type_params = binding.type_params.reject { |name| receiver_substitutions.key?(name) }
  unless remaining_type_params.length == explicit_type_arguments.length
    raise LoweringError.new("function #{binding.name} expects #{remaining_type_params.length} type arguments, got #{explicit_type_arguments.length}", line: 0, column: 0, path: @ctx.current_analysis_path)
  end

  substitutions = receiver_substitutions.dup
  remaining_type_params.zip(explicit_type_arguments).each do |name, type_argument|
    raise LoweringError.new("generic function #{binding.name} cannot be instantiated with ref types", line: 0, column: 0, path: @ctx.current_analysis_path) if contains_ref_type?(type_argument)

    substitutions[name] = type_argument
  end

  type_arguments = binding.type_params.map do |name|
    inferred = substitutions[name]
    raise LoweringError.new("cannot infer type argument #{name} for function #{binding.name}", line: 0, column: 0, path: @ctx.current_analysis_path) unless inferred

    inferred
  end

  instantiate_function_binding(binding, type_arguments)
end

#integer_literal_expression?(expression) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/milk_tea/core/lowering/resolve.rb', line 1007

def integer_literal_expression?(expression)
  expression.is_a?(AST::IntegerLiteral)
end

#interface_implementation_key(type) ⇒ Object 



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# File 'lib/milk_tea/core/lowering/resolve.rb', line 2145

def interface_implementation_key(type)
  return type.definition if type.is_a?(Types::StructInstance)

  type
end

#literal_type_argument_name_candidate?(type_ref) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/milk_tea/core/lowering/resolve.rb', line 1487

def literal_type_argument_name_candidate?(type_ref)
  type_ref.arguments.empty? && !type_ref.nullable
end

#lower_array_to_span_expression(expression, target_type) ⇒ Object 



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# File 'lib/milk_tea/core/lowering/resolve.rb', line 114

def lower_array_to_span_expression(expression, target_type)
  array_type = expression.type
  array_type = referenced_type(array_type) if ref_type?(array_type)

  IR::AggregateLiteral.new(
    type: target_type,
    fields: [
      IR::AggregateField.new(
        name: "data",
        value: IR::AddressOf.new(
          expression: IR::Index.new(
            receiver: expression,
            index: IR::IntegerLiteral.new(value: 0, type: @ctx.types.fetch("ptr_uint")),
            type: target_type.element_type,
          ),
          type: pointer_to(target_type.element_type),
        ),
      ),
      IR::AggregateField.new(
        name: "len",
        value: IR::IntegerLiteral.new(value: array_length(array_type), type: @ctx.types.fetch("ptr_uint")),
      ),
    ],
  )
end

#lower_fn_to_proc_expression(source_expression, source_function, env:, expected_type:) ⇒ Object

Raises:



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# File 'lib/milk_tea/core/lowering/resolve.rb', line 55

def lower_fn_to_proc_expression(source_expression, source_function, env:, expected_type:)
  raise LoweringError.new("function-to-proc coercion requires a direct function name", line: 0, column: 0, path: @ctx.current_analysis_path) unless source_function.is_a?(IR::Name)

  proc_id = fresh_proc_symbol
  invoke_c_name = "#{@ctx.module_prefix}__proc_#{proc_id}__invoke"
  release_linkage_name = "#{@ctx.module_prefix}__proc_#{proc_id}__release"
  retain_c_name = "#{@ctx.module_prefix}__proc_#{proc_id}__retain"

  @artifacts.synthetic_functions << build_direct_function_proc_invoke_function(source_expression, source_function.name, source_function.type, expected_type, invoke_c_name)
  @artifacts.synthetic_functions << build_proc_noop_release_function(release_linkage_name)
  @artifacts.synthetic_functions << build_proc_noop_retain_function(retain_c_name)

  IR::AggregateLiteral.new(
    type: expected_type,
    fields: [
      IR::AggregateField.new(name: "env", value: IR::NullLiteral.new(type: proc_env_pointer_type)),
      IR::AggregateField.new(name: "invoke", value: IR::Name.new(name: invoke_c_name, type: proc_invoke_function_type(expected_type), pointer: false)),
      IR::AggregateField.new(name: "release", value: IR::Name.new(name: release_linkage_name, type: proc_release_function_type, pointer: false)),
      IR::AggregateField.new(name: "retain", value: IR::Name.new(name: retain_c_name, type: proc_retain_function_type, pointer: false)),
    ],
  )
end

#lower_str_buffer_to_span_expression(expression, target_type) ⇒ Object 



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# File 'lib/milk_tea/core/lowering/resolve.rb', line 140

def lower_str_buffer_to_span_expression(expression, target_type)
  IR::AggregateLiteral.new(
    type: target_type,
    fields: [
      IR::AggregateField.new(
        name: "data",
        value: IR::Call.new(
          callee: "mt_str_buffer_prepare_write",
          arguments: [
            lower_str_buffer_data_pointer_from_lowered(expression),
            IR::IntegerLiteral.new(value: str_buffer_capacity(expression.type), type: @ctx.types.fetch("ptr_uint")),
            lower_str_buffer_dirty_pointer_from_lowered(expression),
          ],
          type: pointer_to(target_type.element_type),
        ),
      ),
      IR::AggregateField.new(
        name: "len",
        value: IR::IntegerLiteral.new(value: str_buffer_storage_capacity(expression.type), type: @ctx.types.fetch("ptr_uint")),
      ),
    ],
  )
end

#merge_cstr_metadata_after_if_statement!(statement, env) ⇒ Object 



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# File 'lib/milk_tea/core/lowering/resolve.rb', line 258

def merge_cstr_metadata_after_if_statement!(statement, env)
  exit_envs = cstr_metadata_exit_envs_for_if_statement(statement, env)
  return if exit_envs.empty?

  trackable_binding_names(env).each do |name|
    binding = lookup_value(name, env)
    next unless binding

    replace_binding_cstr_metadata!(
      name,
      env,
      cstr_backed: cstr_trackable_type?(binding[:type]) && exit_envs.all? { |exit_env| binding_cstr_backed?(lookup_value(name, exit_env)) },
      cstr_list_backed: cstr_list_trackable_type?(binding[:type]) && exit_envs.all? { |exit_env| binding_cstr_list_backed?(lookup_value(name, exit_env)) },
    )
  end
end

#method_analysis_key(method_ast) ⇒ Object 



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# File 'lib/milk_tea/core/lowering/resolve.rb', line 1379

def method_analysis_key(method_ast)
  method_ast.kind == :static ? "static:#{method_ast.name}" : method_ast.name
end

#methods_receiver_type_argument_names!(type_ref) ⇒ Object

Raises:



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# File 'lib/milk_tea/core/lowering/resolve.rb', line 2222

def methods_receiver_type_argument_names!(type_ref)
  names = type_ref.arguments.map do |argument|
    value = argument.value
    next unless value.is_a?(AST::TypeRef)
    next unless value.arguments.empty? && !value.nullable && value.name.parts.length == 1

    value.name.parts.first
  end

  raise LoweringError.new("extending target #{type_ref} must use the receiver type parameters directly", line: 0, column: 0, path: @ctx.current_analysis_path) if names.any?(&:nil?)

  names
end

#pointer_arithmetic_result_type(operator, left_type, right_type) ⇒ Object 



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# File 'lib/milk_tea/core/lowering/resolve.rb', line 1155

def pointer_arithmetic_result_type(operator, left_type, right_type)
  return left_type if pointer_type?(left_type) && integer_type?(right_type) && (operator == "+" || operator == "-")
  return right_type if operator == "+" && integer_type?(left_type) && pointer_type?(right_type)

  nil
end

#pointer_lowered_method_receiver?(callee_type, callee_binding) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/milk_tea/core/lowering/resolve.rb', line 1044

def pointer_lowered_method_receiver?(callee_type, callee_binding)
  return true if callee_type.receiver_editable

  receiver_type_uses_pointer_lowering?(callee_type.receiver_type) && !callee_binding&.async
end

#pointer_lowered_sync_method_receiver?(binding) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/milk_tea/core/lowering/resolve.rb', line 1038

def pointer_lowered_sync_method_receiver?(binding)
  return false if binding.async

  pointer_lowered_method_receiver?(binding.type, binding)
end
 


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# File 'lib/milk_tea/core/lowering/resolve.rb', line 1023

def promoted_binary_operand_type(operator, left_type, right_type)
  case operator
  when "+", "-", "*", "/", "<", "<=", ">", ">=", "==", "!="
    common_numeric_type(left_type, right_type)
  when "%"
    common_integer_type(left_type, right_type)
  end
end

#propagating_expected_type(operator, expected_type) ⇒ Object 



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# File 'lib/milk_tea/core/lowering/resolve.rb', line 1011

def propagating_expected_type(operator, expected_type)
  case operator
  when "+", "-", "*", "/", "%", "<<", ">>"
    return expected_type if expected_type.is_a?(Types::Primitive) && expected_type.numeric?
  when "|", "&", "^"
    return expected_type if expected_type.is_a?(Types::Primitive) && expected_type.integer?
    return expected_type if expected_type.is_a?(Types::Flags)
  end

  nil
end

#receiver_type_uses_pointer_lowering?(type) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/milk_tea/core/lowering/resolve.rb', line 1050

def receiver_type_uses_pointer_lowering?(type)
  case type
  when Types::Nullable
    receiver_type_uses_pointer_lowering?(type.base)
  when Types::Struct, Types::StructInstance
    type_contains_array_storage?(type)
  else
    false
  end
end

#record_external_layout_assertion(source_type, target_type) ⇒ Object 



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# File 'lib/milk_tea/core/lowering/resolve.rb', line 1085

def record_external_layout_assertion(source_type, target_type)
  source_root = ffi_external_layout_root_type(source_type)
  target_root = ffi_external_layout_root_type(target_type)
  return unless source_root && target_root
  return unless source_root.external && target_root.external
  return if source_root.module_name == target_root.module_name

  pair_key = [[source_root.module_name, source_root.name], [target_root.module_name, target_root.name]].sort.freeze
  return if @artifacts.emitted_external_layout_pairs[pair_key]

  @artifacts.emitted_external_layout_pairs[pair_key] = true
  @artifacts.external_layout_assertions << IR::StaticAssert.new(
    condition: IR::Binary.new(
      operator: "==",
      left: IR::SizeofExpr.new(target_type: source_root, type: @ctx.types.fetch("ptr_uint")),
      right: IR::SizeofExpr.new(target_type: target_root, type: @ctx.types.fetch("ptr_uint")),
      type: @ctx.types.fetch("bool"),
    ),
    message: IR::StringLiteral.new(
      value: "FFI layout mismatch: #{source_root} vs #{target_root}",
      type: @ctx.types.fetch("str"),
      cstring: false,
    ),
  )
end

#reflection_identifier_name(expression) ⇒ Object 



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# File 'lib/milk_tea/core/lowering/resolve.rb', line 2008

def reflection_identifier_name(expression)
  expression.is_a?(AST::Identifier) ? expression.name : nil
end

#reflection_positional_arguments?(arguments, expected_length) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/milk_tea/core/lowering/resolve.rb', line 1909

def reflection_positional_arguments?(arguments, expected_length)
  arguments.length == expected_length && arguments.none?(&:name)
end

#reflection_type_from_expression(expression, env:) ⇒ Object 



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# File 'lib/milk_tea/core/lowering/resolve.rb', line 1920

def reflection_type_from_expression(expression, env:)
  case expression
  when AST::Identifier
    return nil if env && lookup_value(expression.name, env)

    current_type_params[expression.name] || @ctx.types[expression.name]
  when AST::MemberAccess
    return nil unless expression.receiver.is_a?(AST::Identifier)

    if @ctx.imports.key?(expression.receiver.name)
      imported_module = @ctx.imports[expression.receiver.name]
      return nil if imported_module.private_type?(expression.member)
      return imported_module.types[expression.member]
    end

    parent_type = @ctx.types[expression.receiver.name]
    return parent_type.nested_types[expression.member] if parent_type.respond_to?(:nested_types) && parent_type.nested_types.key?(expression.member)

    nil
  else
    nil
  end
end

#reinterpret_expression(expression, target_type) ⇒ Object 



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# File 'lib/milk_tea/core/lowering/resolve.rb', line 1067

def reinterpret_expression(expression, target_type)
  return expression if expression.type == target_type

  IR::ReinterpretExpr.new(target_type:, source_type: expression.type, expression:, type: target_type)
end

#replace_binding_cstr_metadata!(name, env, cstr_backed:, cstr_list_backed:) ⇒ Object 



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# File 'lib/milk_tea/core/lowering/resolve.rb', line 360

def replace_binding_cstr_metadata!(name, env, cstr_backed:, cstr_list_backed:)
  env[:scopes].reverse_each do |scope|
    next if scope.is_a?(FlowScope)
    next unless scope.key?(name)

    scope[name] = scope.fetch(name).merge(cstr_backed:, cstr_list_backed:)
    return
  end
end

#resolve_attribute_name_argument(expression) ⇒ Object 



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# File 'lib/milk_tea/core/lowering/resolve.rb', line 1991

def resolve_attribute_name_argument(expression)
  case expression
  when AST::Identifier
    @ctx.attributes[expression.name] || builtin_attribute_binding(expression.name)
  when AST::MemberAccess
    return nil unless expression.receiver.is_a?(AST::Identifier)

    imported_module = @ctx.imports[expression.receiver.name]
    return nil unless imported_module
    return nil if imported_module.private_attribute?(expression.member)

    imported_module.attributes[expression.member]
  else
    nil
  end
end

#resolve_callable_handle_argument(expression) ⇒ Object 



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# File 'lib/milk_tea/core/lowering/resolve.rb', line 1968

def resolve_callable_handle_argument(expression)
  case expression
  when AST::Identifier
    binding = @ctx.functions[expression.name]
    return nil unless binding&.ast

    Types::CallableHandle.new(expression.name, binding.ast)
  when AST::MemberAccess
    return nil unless expression.receiver.is_a?(AST::Identifier)

    imported_module = @ctx.imports[expression.receiver.name]
    return nil unless imported_module
    return nil if imported_module.private_function?(expression.member)

    binding = imported_module.functions[expression.member]
    return nil unless binding&.ast

    Types::CallableHandle.new("#{expression.receiver.name}.#{expression.member}", binding.ast)
  else
    nil
  end
end

#resolve_callee(callee, env, arguments: nil) ⇒ Object 



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# File 'lib/milk_tea/core/lowering/resolve.rb', line 410

def resolve_callee(callee, env, arguments: nil)
  case callee
  when AST::Identifier
    resolve_identifier_callee(callee, env, arguments)
  when AST::MemberAccess
    resolve_member_access_callee(callee, env, arguments)
  when AST::Specialization
    resolve_specialization_callee(callee, env)
  else
    resolve_expression_callee(callee, env)
  end
end

#resolve_current_module_const_value(name) ⇒ Object 



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# File 'lib/milk_tea/core/lowering/resolve.rb', line 1504

def resolve_current_module_const_value(name)
  binding = @ctx.values[name]
  return unless binding&.kind == :const

  binding.const_value
end

#resolve_default_specialization(expression, env:) ⇒ Object

Raises:



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# File 'lib/milk_tea/core/lowering/resolve.rb', line 1256

def resolve_default_specialization(expression, env:)
  target_type = resolve_type_ref(expression.arguments.fetch(0).value)

  explicit_default = resolve_explicit_default_binding(target_type, context: "default[#{target_type}]")
  raise LoweringError.new("default[#{target_type}] requires associated function #{target_type}.default()", line: 0, column: 0, path: @ctx.current_analysis_path) unless explicit_default

  DefaultResolution.new(target_type:, binding: explicit_default.binding, callee_name: explicit_default.callee_name)
end

#resolve_equal_specialization(expression, env:) ⇒ Object

Raises:



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# File 'lib/milk_tea/core/lowering/resolve.rb', line 1273

def resolve_equal_specialization(expression, env:)
  target_type = resolve_type_ref(expression.arguments.fetch(0).value)
  explicit_equal = resolve_explicit_equal_binding(target_type, context: "equal[#{target_type}]")
  raise LoweringError.new("equal[#{target_type}] requires associated function #{target_type}.equal(left: const_ptr[#{target_type}], right: const_ptr[#{target_type}]) -> bool", line: 0, column: 0, path: @ctx.current_analysis_path) unless explicit_equal

  EqualResolution.new(target_type:, binding: explicit_equal.binding, callee_name: explicit_equal.callee_name)
end

#resolve_explicit_associated_binding(target_type, method_name, requirement_message:) {|method_binding, method_analysis, method_entry_receiver_type| ... } ⇒ Object

Yields:

  • (method_binding, method_analysis, method_entry_receiver_type)

Raises:



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# File 'lib/milk_tea/core/lowering/resolve.rb', line 1383

def resolve_explicit_associated_binding(target_type, method_name, requirement_message:)
  dispatch_receiver_type = method_dispatch_receiver_type(target_type)
  method_entry_receiver_type = target_type
  static_method_name = "static:#{method_name}"
  method_entry = @method_definitions[[target_type, static_method_name]]
  unless method_entry || dispatch_receiver_type == target_type
    method_entry_receiver_type = dispatch_receiver_type
    method_entry = @method_definitions[[dispatch_receiver_type, static_method_name]]
  end
  return nil unless method_entry

  method_analysis, method_ast = method_entry
  method_binding = method_analysis.methods.fetch(method_entry_receiver_type).fetch(method_analysis_key(method_ast))
  raise LoweringError.new(requirement_message, line: 0, column: 0, path: @ctx.current_analysis_path) unless method_binding.type.receiver_type.nil?

  method_binding = instantiate_function_binding_with_receiver(method_binding, [], receiver_type: target_type) if method_binding.type_params.any?
  yield method_binding, method_analysis, method_entry_receiver_type

  callee_name = if method_binding.external
                  external_function_c_name(method_binding)
                else
                  function_binding_c_name(method_binding, module_name: method_analysis.module_name, receiver_type: method_entry_receiver_type)
                end

  case method_name
  when "default"
    ExplicitDefaultBinding.new(binding: method_binding, callee_name:)
  when "hash"
    ExplicitHashBinding.new(binding: method_binding, callee_name:)
  when "equal"
    ExplicitEqualBinding.new(binding: method_binding, callee_name:)
  when "order"
    ExplicitOrderBinding.new(binding: method_binding, callee_name:)
  else
    raise LoweringError.new("unsupported associated hook #{method_name}", line: 0, column: 0, path: @ctx.current_analysis_path)
  end
end

#resolve_explicit_default_binding(target_type, context:) ⇒ Object 



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# File 'lib/milk_tea/core/lowering/resolve.rb', line 1289

def resolve_explicit_default_binding(target_type, context:)
  requirement_message = "#{context} requires associated function #{target_type}.default()"
  resolve_explicit_associated_binding(target_type, "default", requirement_message:) do |method_binding, _method_analysis, _method_entry_receiver_type|
    raise LoweringError.new("#{context} requires #{target_type}.default() to take 0 arguments", line: 0, column: 0, path: @ctx.current_analysis_path) unless method_binding.type.params.empty?
    unless method_binding.type.return_type == target_type
      raise LoweringError.new("#{context} requires #{target_type}.default() to return #{target_type}, got #{method_binding.type.return_type}", line: 0, column: 0, path: @ctx.current_analysis_path)
    end
  end
end

#resolve_explicit_equal_binding(target_type, context:) ⇒ Object 



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# File 'lib/milk_tea/core/lowering/resolve.rb', line 1311

def resolve_explicit_equal_binding(target_type, context:)
  requirement_message = "#{context} requires associated function #{target_type}.equal(left: const_ptr[#{target_type}], right: const_ptr[#{target_type}]) -> bool"
  resolve_explicit_associated_binding(target_type, "equal", requirement_message:) do |method_binding, _method_analysis, _method_entry_receiver_type|
    expected_param_types = [const_pointer_to(target_type), const_pointer_to(target_type)]
    unless method_binding.type.params.map(&:type) == expected_param_types
      raise LoweringError.new("#{context} requires #{target_type}.equal(left: const_ptr[#{target_type}], right: const_ptr[#{target_type}]) -> bool", line: 0, column: 0, path: @ctx.current_analysis_path)
    end
    unless method_binding.type.return_type == @ctx.types.fetch("bool")
      raise LoweringError.new("#{context} requires #{target_type}.equal(left: const_ptr[#{target_type}], right: const_ptr[#{target_type}]) -> bool, got #{method_binding.type.return_type}", line: 0, column: 0, path: @ctx.current_analysis_path)
    end
  end
end

#resolve_explicit_format_append_binding(target_type, context:) ⇒ Object 



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# File 'lib/milk_tea/core/lowering/resolve.rb', line 1366

def resolve_explicit_format_append_binding(target_type, context:)
  requirement_message = "#{context} requires method #{target_type}.append_format(output: ref[std.string.String]) -> void"
  resolve_explicit_instance_binding(target_type, "append_format", requirement_message:) do |method_binding, _method_analysis, _method_entry_receiver_type|
    raise LoweringError.new("#{context} requires #{target_type}.append_format() to be non-editable", line: 0, column: 0, path: @ctx.current_analysis_path) if method_binding.type.receiver_editable
    unless method_binding.type.params.length == 1 && string_builder_ref_type?(method_binding.type.params.first.type)
      raise LoweringError.new("#{context} requires #{target_type}.append_format(output: ref[std.string.String]) -> void", line: 0, column: 0, path: @ctx.current_analysis_path)
    end
    unless method_binding.type.return_type == @ctx.types.fetch("void")
      raise LoweringError.new("#{context} requires #{target_type}.append_format(output: ref[std.string.String]) -> void, got #{method_binding.type.return_type}", line: 0, column: 0, path: @ctx.current_analysis_path)
    end
  end
end

#resolve_explicit_format_binding(target_type, context:) ⇒ Object 



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# File 'lib/milk_tea/core/lowering/resolve.rb', line 1337

def resolve_explicit_format_binding(target_type, context:)
  length_binding = resolve_explicit_format_len_binding(target_type, context:)
  append_binding = resolve_explicit_format_append_binding(target_type, context:)

  return ExplicitFormatBinding.new(
    length_binding: length_binding.fetch(:binding),
    length_callee_name: length_binding.fetch(:callee_name),
    append_binding: append_binding.fetch(:binding),
    append_callee_name: append_binding.fetch(:callee_name),
  ) if length_binding && append_binding

  if length_binding || append_binding
    raise LoweringError.new("#{context} requires methods #{target_type}.format_len() -> ptr_uint and #{target_type}.append_format(output: ref[std.string.String]) -> void", line: 0, column: 0, path: @ctx.current_analysis_path)
  end

  nil
end

#resolve_explicit_format_len_binding(target_type, context:) ⇒ Object 



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# File 'lib/milk_tea/core/lowering/resolve.rb', line 1355

def resolve_explicit_format_len_binding(target_type, context:)
  requirement_message = "#{context} requires method #{target_type}.format_len() -> ptr_uint"
  resolve_explicit_instance_binding(target_type, "format_len", requirement_message:) do |method_binding, _method_analysis, _method_entry_receiver_type|
    raise LoweringError.new("#{context} requires #{target_type}.format_len() to take 0 arguments", line: 0, column: 0, path: @ctx.current_analysis_path) unless method_binding.type.params.empty?
    raise LoweringError.new("#{context} requires #{target_type}.format_len() to be non-editable", line: 0, column: 0, path: @ctx.current_analysis_path) if method_binding.type.receiver_editable
    unless method_binding.type.return_type == @ctx.types.fetch("ptr_uint")
      raise LoweringError.new("#{context} requires #{target_type}.format_len() -> ptr_uint, got #{method_binding.type.return_type}", line: 0, column: 0, path: @ctx.current_analysis_path)
    end
  end
end

#resolve_explicit_hash_binding(target_type, context:) ⇒ Object 



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# File 'lib/milk_tea/core/lowering/resolve.rb', line 1299

def resolve_explicit_hash_binding(target_type, context:)
  requirement_message = "#{context} requires associated function #{target_type}.hash(value: const_ptr[#{target_type}]) -> uint"
  resolve_explicit_associated_binding(target_type, "hash", requirement_message:) do |method_binding, _method_analysis, _method_entry_receiver_type|
    unless method_binding.type.params.map(&:type) == [const_pointer_to(target_type)]
      raise LoweringError.new("#{context} requires #{target_type}.hash(value: const_ptr[#{target_type}]) -> uint", line: 0, column: 0, path: @ctx.current_analysis_path)
    end
    unless method_binding.type.return_type == @ctx.types.fetch("uint")
      raise LoweringError.new("#{context} requires #{target_type}.hash(value: const_ptr[#{target_type}]) -> uint, got #{method_binding.type.return_type}", line: 0, column: 0, path: @ctx.current_analysis_path)
    end
  end
end

#resolve_explicit_instance_binding(target_type, method_name, requirement_message:) {|method_binding, method_analysis, method_entry_receiver_type| ... } ⇒ Object

Yields:

  • (method_binding, method_analysis, method_entry_receiver_type)

Raises:



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# File 'lib/milk_tea/core/lowering/resolve.rb', line 1421

def resolve_explicit_instance_binding(target_type, method_name, requirement_message:)
  dispatch_receiver_type = method_dispatch_receiver_type(target_type)
  method_entry_receiver_type = target_type
  method_entry = @method_definitions[[target_type, method_name]]
  unless method_entry || dispatch_receiver_type == target_type
    method_entry_receiver_type = dispatch_receiver_type
    method_entry = @method_definitions[[dispatch_receiver_type, method_name]]
  end
  return nil unless method_entry

  method_analysis, method_ast = method_entry
  method_binding = method_analysis.methods.fetch(method_entry_receiver_type).fetch(method_analysis_key(method_ast))
  raise LoweringError.new(requirement_message, line: 0, column: 0, path: @ctx.current_analysis_path) if method_binding.type.receiver_type.nil?

  method_binding = instantiate_function_binding_with_receiver(method_binding, [], receiver_type: target_type) if method_binding.type_params.any?
  yield method_binding, method_analysis, method_entry_receiver_type

  callee_name = if method_binding.external
                  external_function_c_name(method_binding)
                else
                  function_binding_c_name(method_binding, module_name: method_analysis.module_name, receiver_type: method_entry_receiver_type)
                end

  {
    binding: method_binding,
    callee_name: callee_name,
  }
end

#resolve_explicit_order_binding(target_type, context:) ⇒ Object 



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# File 'lib/milk_tea/core/lowering/resolve.rb', line 1324

def resolve_explicit_order_binding(target_type, context:)
  requirement_message = "#{context} requires associated function #{target_type}.order(left: const_ptr[#{target_type}], right: const_ptr[#{target_type}]) -> int"
  resolve_explicit_associated_binding(target_type, "order", requirement_message:) do |method_binding, _method_analysis, _method_entry_receiver_type|
    expected_param_types = [const_pointer_to(target_type), const_pointer_to(target_type)]
    unless method_binding.type.params.map(&:type) == expected_param_types
      raise LoweringError.new("#{context} requires #{target_type}.order(left: const_ptr[#{target_type}], right: const_ptr[#{target_type}]) -> int", line: 0, column: 0, path: @ctx.current_analysis_path)
    end
    unless method_binding.type.return_type == @ctx.types.fetch("int")
      raise LoweringError.new("#{context} requires #{target_type}.order(left: const_ptr[#{target_type}], right: const_ptr[#{target_type}]) -> int, got #{method_binding.type.return_type}", line: 0, column: 0, path: @ctx.current_analysis_path)
    end
  end
end

#resolve_expression_callee(callee, env) ⇒ Object

Raises:



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# File 'lib/milk_tea/core/lowering/resolve.rb', line 694

def resolve_expression_callee(callee, env)
  callee_type = infer_expression_type(callee, env:)
  return [:callable_value, nil, nil, callee_type, nil] if callable_type?(callee_type)

  raise LoweringError.new("unsupported callee #{callee.class.name}", line: 0, column: 0, path: @ctx.current_analysis_path)
end

#resolve_field_handle_type_ref(parts) ⇒ Object

Resolves a bare dotted reflection type ref field.type (where field is a compile-time field_handle bound in the active inline-for env) to the field's concrete type. Mirrors the sema-side resolve_compile_time_type_ref.



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# File 'lib/milk_tea/core/lowering/resolve.rb', line 2621

def resolve_field_handle_type_ref(parts)
  return nil unless parts.length == 2 && parts.last == "type"

  binding = lookup_value(parts.first, @type_resolution_env)
  handle = binding && binding[:const_value]
  return nil unless handle.is_a?(Types::FieldHandle)

  # Use the struct's already-resolved field type (module-independent) rather
  # than re-resolving the field's declared TypeRef, which would look up a
  # user struct name in this (std) module's scope and fail.
  handle.struct_handle.struct_type.field(handle.field_name)
end

#resolve_hash_specialization(expression, env:) ⇒ Object

Raises:



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# File 'lib/milk_tea/core/lowering/resolve.rb', line 1265

def resolve_hash_specialization(expression, env:)
  target_type = resolve_type_ref(expression.arguments.fetch(0).value)
  explicit_hash = resolve_explicit_hash_binding(target_type, context: "hash[#{target_type}]")
  raise LoweringError.new("hash[#{target_type}] requires associated function #{target_type}.hash(value: const_ptr[#{target_type}]) -> uint", line: 0, column: 0, path: @ctx.current_analysis_path) unless explicit_hash

  HashResolution.new(target_type:, binding: explicit_hash.binding, callee_name: explicit_hash.callee_name)
end

#resolve_identifier_callee(callee, env, arguments) ⇒ Object

Raises:



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# File 'lib/milk_tea/core/lowering/resolve.rb', line 423

def resolve_identifier_callee(callee, env, arguments)
  if (binding = lookup_value(callee.name, env))
    return [:callable_value, nil, nil, binding[:type], nil] if callable_type?(binding[:type])

    raise LoweringError.new("#{callee.name} is not callable", line: 0, column: 0, path: @ctx.current_analysis_path)
  end

  if @ctx.functions.key?(callee.name)
    binding = specialize_function_binding(@ctx.functions.fetch(callee.name), arguments, env)
    callee_name = if binding.external
                    external_function_c_name(binding)
                  else
                    function_binding_c_name(binding, module_name: @ctx.module_name)
                  end
    return [:function, callee_name, nil, binding.type, binding]
  end

  if (kind = PASS_THROUGH_BUILTINS[callee.name])
    return [kind, nil, nil, nil]
  end

  if COMPILE_TIME_BUILTINS.include?(callee.name)
    return [:compile_time_builtin, callee.name, nil, compile_time_builtin_function_type(callee.name, arguments, env)]
  end

  type = lookup_named_type(callee.name)
  if type.is_a?(Types::Struct) || type.is_a?(Types::StringView) || task_type?(type) || type.is_a?(Types::Vector) || type.is_a?(Types::Matrix) || type.is_a?(Types::Quaternion)
    return [:struct_literal, nil, nil, type]
  end

  if type.is_a?(Types::GenericStructDefinition) || type.is_a?(Types::GenericVariantDefinition)
    raise LoweringError.new("generic type #{callee.name} requires type arguments", line: 0, column: 0, path: @ctx.current_analysis_path)
  end

  emit_fn = @artifacts.emitted_declarations.find { |d| d.is_a?(IR::Function) && d.name == callee.name }
  if emit_fn
    return [:function, emit_fn.linkage_name, nil, emit_fn.return_type, nil]
  end

  raise LoweringError.new("unknown callee #{callee.name}", line: 0, column: 0, path: @ctx.current_analysis_path)
end

#resolve_imported_module_const_value(import_name, value_name) ⇒ Object 



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# File 'lib/milk_tea/core/lowering/resolve.rb', line 1511

def resolve_imported_module_const_value(import_name, value_name)
  imported_module = @ctx.imports[import_name]
  return unless imported_module
  if imported_module.private_value?(value_name)
    raise LoweringError.new("#{import_name}.#{value_name} is private to module #{imported_module.name}", line: 0, column: 0, path: @ctx.current_analysis_path)
  end

  binding = imported_module.values[value_name]
  return unless binding&.kind == :const

  binding.const_value
end

#resolve_interface_ref(interface_ref) ⇒ Object

Raises:



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# File 'lib/milk_tea/core/lowering/resolve.rb', line 2655

def resolve_interface_ref(interface_ref)
  parts = interface_ref.parts
  interface = if parts.length == 1
                @ctx.interfaces[parts.first]
              elsif parts.length == 2 && @ctx.imports.key?(parts.first)
                @ctx.imports.fetch(parts.first).interfaces[parts.last]
              end
  raise LoweringError.new("unknown interface #{interface_ref}", line: 0, column: 0, path: @ctx.current_analysis_path) unless interface

  if interface_ref.type_arguments.any?
    raise LoweringError.new("interface #{interface.name} is not generic", line: 0, column: 0, path: @ctx.current_analysis_path) unless interface.respond_to?(:instantiate)
    type_args = interface_ref.type_arguments.map { |arg| resolve_type_ref(arg) }
    interface.instantiate(type_args)
  else
    interface
  end
end

#resolve_member_access_callee(callee, env, arguments) ⇒ Object

Raises:



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# File 'lib/milk_tea/core/lowering/resolve.rb', line 465

def resolve_member_access_callee(callee, env, arguments)
  if callee.receiver.is_a?(AST::Identifier) && @ctx.imports.key?(callee.receiver.name)
    imported_module = @ctx.imports.fetch(callee.receiver.name)

    if imported_module.functions.key?(callee.member)
      binding = specialize_function_binding(imported_module.functions.fetch(callee.member), arguments, env)
      unless binding.owner
        binding = binding.with(owner: imported_module.respond_to?(:analysis) ? imported_module.analysis : imported_module)
      end
      return [:function, function_binding_c_name(binding, module_name: imported_module.name), nil, binding.type, binding] unless binding.external

      return [:function, external_function_c_name(binding), nil, binding.type, binding]
    end
    imported_type = imported_module.types[callee.member]
    if imported_type.is_a?(Types::GenericStructDefinition) || imported_type.is_a?(Types::GenericVariantDefinition)
      raise LoweringError.new("generic type #{callee.receiver.name}.#{callee.member} requires type arguments", line: 0, column: 0, path: @ctx.current_analysis_path)
    end

    if imported_type.is_a?(Types::Struct) || imported_type.is_a?(Types::StringView) || task_type?(imported_type) || imported_type.is_a?(Types::Vector) || imported_type.is_a?(Types::Matrix) || imported_type.is_a?(Types::Quaternion)
      return [:struct_literal, nil, nil, imported_module.types.fetch(callee.member)]
    end

    if imported_type.is_a?(Types::Variant) && imported_type.arm_names.include?(callee.member)
      arm_name = callee.member
      return [:variant_arm_ctor, nil, nil, imported_type, [imported_type, arm_name]]
    end
  end

  if (type_expr = resolve_type_expression(callee.receiver))
    if type_expr.is_a?(Types::Variant) && type_expr.arm_names.include?(callee.member)
      arm_name = callee.member
      return [:variant_arm_ctor, nil, nil, type_expr, [type_expr, arm_name]]
    end

    if type_expr.respond_to?(:nested_types) && type_expr.nested_types.key?(callee.member)
      return [:struct_literal, nil, nil, type_expr.nested_types[callee.member]]
    end

    dispatch_receiver_type = method_dispatch_receiver_type(type_expr)
    method_entry_receiver_type = type_expr
    method_entry = @method_definitions[[type_expr, callee.member]]
    method_entry ||= @method_definitions[[type_expr, "static:#{callee.member}"]]
    unless method_entry || dispatch_receiver_type == type_expr
      method_entry_receiver_type = dispatch_receiver_type
      method_entry = @method_definitions[[dispatch_receiver_type, callee.member]]
      method_entry ||= @method_definitions[[dispatch_receiver_type, "static:#{callee.member}"]]
    end
    if method_entry
      method_analysis, method_ast = method_entry
      method_binding = method_analysis.methods.fetch(method_entry_receiver_type).fetch(method_analysis_key(method_ast))
      if method_binding.type.receiver_type.nil?
        method_binding = specialize_function_binding(method_binding, arguments, env, receiver_type: type_expr) if method_binding.type_params.any?
        return [:associated_method, function_binding_c_name(method_binding, module_name: method_analysis.module_name, receiver_type: method_entry_receiver_type), nil, method_binding.type, method_binding]
      end
    end

    raise LoweringError.new("unknown associated function #{type_expr}.#{callee.member}", line: 0, column: 0, path: @ctx.current_analysis_path)
  end

  resolved_receiver_type = infer_method_receiver_type(callee.receiver, env:, member_name: callee.member)

  if dyn_type?(resolved_receiver_type)
    interface = resolved_receiver_type.interface_binding
    method_binding = interface.methods[callee.member]
    raise LoweringError.new("no method '#{callee.member}' on interface #{interface.name}", line: 0, column: 0, path: @ctx.current_analysis_path) unless method_binding
    return [:dyn_method, nil, callee.receiver, method_binding, nil]
  end

  dispatch_receiver_type = method_dispatch_receiver_type(resolved_receiver_type)
  method_entry_receiver_type = resolved_receiver_type
  method_entry = @method_definitions[[resolved_receiver_type, callee.member]]
  unless method_entry || dispatch_receiver_type == resolved_receiver_type
    method_entry_receiver_type = dispatch_receiver_type
    method_entry = @method_definitions[[dispatch_receiver_type, callee.member]]
  end
  if method_entry
    method_analysis, method_ast = method_entry
    method_analysis_key = method_ast.kind == :static ? "static:#{method_ast.name}" : method_ast.name
    method_binding = method_analysis.methods.fetch(method_entry_receiver_type).fetch(method_analysis_key)
    method_binding = specialize_function_binding(method_binding, arguments, env, receiver_type: resolved_receiver_type)
    return [
      :method,
      function_binding_c_name(method_binding, module_name: method_analysis.module_name, receiver_type: method_entry_receiver_type),
      callee.receiver,
      method_binding.type,
      method_binding,
    ]
  end

  if callee.member == "with" && struct_with_target_type?(resolved_receiver_type)
    return [:struct_with, nil, callee.receiver, resolved_receiver_type]
  end

  if (precomputed = @ctx.resolved_call_kinds[@ctx.ast.node_ids[callee.object_id]])
    case precomputed
    when :str_buffer_clear, :str_buffer_assign, :str_buffer_append, :str_buffer_assign_format, :str_buffer_append_format,
        :str_buffer_len, :str_buffer_capacity, :str_buffer_as_str, :str_buffer_as_cstr
      return [precomputed, nil, callee.receiver, str_buffer_method_type(precomputed, resolved_receiver_type)]
    when :event_subscribe, :event_subscribe_once, :event_unsubscribe, :event_emit, :event_wait
      event_type = infer_expression_type(callee.receiver, env:)
      return [precomputed, nil, callee.receiver, event_method_type(precomputed, event_type)]
    when :atomic_load, :atomic_store, :atomic_add, :atomic_sub, :atomic_exchange, :atomic_compare_exchange
      elem = atomic_element_type(resolved_receiver_type)
      ret = case precomputed
            when :atomic_load, :atomic_add, :atomic_sub, :atomic_exchange then elem
            when :atomic_store then @ctx.types.fetch("void")
            when :atomic_compare_exchange then @ctx.types.fetch("bool")
            end
      return [precomputed, nil, callee.receiver, Types::Registry.function(nil, params: [], return_type: ret)]
    when :simd_lane_with
      return [precomputed, nil, callee.receiver, Types::Registry.function(nil, params: [], return_type: resolved_receiver_type)]
    end
  end

  if (str_buffer_method = str_buffer_method_kind(resolved_receiver_type, callee.member))
    return [str_buffer_method, nil, callee.receiver, str_buffer_method_type(str_buffer_method, resolved_receiver_type)]
  end

  if (event_method = event_method_kind(resolved_receiver_type, callee.member))
    event_type = infer_expression_type(callee.receiver, env:)
    return [event_method, nil, callee.receiver, event_method_type(event_method, event_type)]
  end

  if (atomic_method = atomic_method_kind(resolved_receiver_type, callee.member))
    elem = atomic_element_type(resolved_receiver_type)
    ret = case atomic_method
          when :atomic_load, :atomic_add, :atomic_sub, :atomic_exchange then elem
          when :atomic_store then @ctx.types.fetch("void")
          when :atomic_compare_exchange then @ctx.types.fetch("bool")
          end
    return [atomic_method, nil, callee.receiver, Types::Registry.function(nil, params: [], return_type: ret)]
  end

  if (simd_method = simd_method_kind(resolved_receiver_type, callee.member))
    ret = case simd_method
          when :simd_lane_with then resolved_receiver_type
          end
    return [simd_method, nil, callee.receiver, Types::Registry.function(nil, params: [], return_type: ret)]
  end

  field_receiver_type = infer_field_receiver_type(callee.receiver, env:)
  if array_type?(field_receiver_type) && callee.member == "as_span"
    return [:array_as_span, nil, callee.receiver, Types::Registry.span(array_element_type(field_receiver_type))]
  end

  member_type = field_receiver_type.respond_to?(:field) ? field_receiver_type.field(callee.member) : nil
  return [:callable_value, nil, nil, member_type, nil] if callable_type?(member_type)

  raise LoweringError.new("unknown callee #{callee.receiver}.#{callee.member}", line: 0, column: 0, path: @ctx.current_analysis_path)
end

#resolve_named_generic_type(parts) ⇒ Object 



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# File 'lib/milk_tea/core/lowering/resolve.rb', line 2602

def resolve_named_generic_type(parts)
  if parts.length == 1
    type = @ctx.types[parts.first]
    return type if type.is_a?(Types::GenericStructDefinition) || type.is_a?(Types::GenericVariantDefinition)
  elsif parts.length >= 2
    type = resolve_nested_type_ref(parts)
    return type if type.is_a?(Types::GenericStructDefinition) || type.is_a?(Types::GenericVariantDefinition)
    if @ctx.imports.key?(parts.first)
      type = @ctx.imports.fetch(parts.first).types[parts.last]
      return type if type.is_a?(Types::GenericStructDefinition) || type.is_a?(Types::GenericVariantDefinition)
    end
  end

  nil
end

#resolve_named_generic_type_for_analysis(analysis, parts) ⇒ Object 



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# File 'lib/milk_tea/core/lowering/resolve.rb', line 2193

def resolve_named_generic_type_for_analysis(analysis, parts)
  if parts.length == 1
    type = analysis.types[parts.first]
    return type if type.is_a?(Types::GenericStructDefinition) || type.is_a?(Types::GenericVariantDefinition)
  elsif parts.length == 2 && analysis.imports.key?(parts.first)
    type = analysis.imports.fetch(parts.first).types[parts.last]
    return type if type.is_a?(Types::GenericStructDefinition) || type.is_a?(Types::GenericVariantDefinition)
  end

  nil
end

#resolve_named_literal_type_argument(type_ref) ⇒ Object 



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# File 'lib/milk_tea/core/lowering/resolve.rb', line 1491

def resolve_named_literal_type_argument(type_ref)
  value = case type_ref.name.parts.length
          when 1
            resolve_current_module_const_value(type_ref.name.parts.first)
          when 2
            resolve_imported_module_const_value(type_ref.name.parts.first, type_ref.name.parts.last)
          end

  return unless value.is_a?(Integer) || value.is_a?(Float)

  Types::LiteralTypeArg.new(value)
end

#resolve_nested_type_ref(parts) ⇒ Object 



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# File 'lib/milk_tea/core/lowering/resolve.rb', line 2590

def resolve_nested_type_ref(parts)
  current = @ctx.types[parts.first]
  return nil unless current.is_a?(Types::Struct) || current.is_a?(Types::GenericStructDefinition)

  parts[1..].each do |part|
    nested = current.respond_to?(:nested_types) ? current.nested_types[part] : nil
    return nil unless nested
    current = nested
  end
  current
end

#resolve_order_specialization(expression, env:) ⇒ Object

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# File 'lib/milk_tea/core/lowering/resolve.rb', line 1281

def resolve_order_specialization(expression, env:)
  target_type = resolve_type_ref(expression.arguments.fetch(0).value)
  explicit_order = resolve_explicit_order_binding(target_type, context: "order[#{target_type}]")
  raise LoweringError.new("order[#{target_type}] requires associated function #{target_type}.order(left: const_ptr[#{target_type}], right: const_ptr[#{target_type}]) -> int", line: 0, column: 0, path: @ctx.current_analysis_path) unless explicit_order

  OrderResolution.new(target_type:, binding: explicit_order.binding, callee_name: explicit_order.callee_name)
end

#resolve_specialization_callee(callee, env) ⇒ Object

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# File 'lib/milk_tea/core/lowering/resolve.rb', line 616

def resolve_specialization_callee(callee, env)
  if callee.callee.is_a?(AST::Identifier)
    case callee.callee.name
    when "reinterpret"
      target_type = resolve_type_ref(callee.arguments.fetch(0).value)
      return [:reinterpret, nil, nil, Types::Registry.function("reinterpret", params: [Types::Registry.parameter("value", target_type)], return_type: target_type)]
    when "array"
      array_type = resolve_type_ref(AST::TypeRef.new(name: AST::QualifiedName.new(parts: ["array"]), arguments: callee.arguments, nullable: false))
      return [:array, nil, nil, array_type]
    when "simd"
      simd_type = resolve_type_ref(AST::TypeRef.new(name: AST::QualifiedName.new(parts: ["simd"]), arguments: callee.arguments, nullable: false))
      return [:simd, nil, nil, simd_type]
    when "span"
      span_type = resolve_type_ref(AST::TypeRef.new(name: AST::QualifiedName.new(parts: ["span"]), arguments: callee.arguments, nullable: false))
      return [:struct_literal, nil, nil, span_type]
    when "zero"
      target_type = resolve_type_ref(callee.arguments.fetch(0).value)
      return [:zero, nil, nil, Types::Registry.function("zero", params: [], return_type: target_type)]
    when "hash"
      resolution = resolve_hash_specialization(callee, env:)
      return [:hash, resolution.callee_name, nil, Types::Registry.function("hash", params: [Types::Registry.parameter("value", resolution.target_type)], return_type: @ctx.types.fetch("uint")), resolution.binding]
    when "equal"
      resolution = resolve_equal_specialization(callee, env:)
      params = [
        Types::Registry.parameter("left", resolution.target_type),
        Types::Registry.parameter("right", resolution.target_type),
      ]
      return [:equal, resolution.callee_name, nil, Types::Registry.function("equal", params:, return_type: @ctx.types.fetch("bool")), resolution.binding]
    when "order"
      resolution = resolve_order_specialization(callee, env:)
      params = [
        Types::Registry.parameter("left", resolution.target_type),
        Types::Registry.parameter("right", resolution.target_type),
      ]
      return [:order, resolution.callee_name, nil, Types::Registry.function("order", params:, return_type: @ctx.types.fetch("int")), resolution.binding]
    when "attribute_arg"
      return [:compile_time_builtin, "attribute_arg", nil, compile_time_builtin_specialization_function_type(callee)]
    when "adapt"
      raise LoweringError.new("adapt requires exactly one type argument", line: 0, column: 0, path: @ctx.current_analysis_path) unless callee.arguments.length == 1

      type_arg = callee.arguments.first.value
      raise LoweringError.new("adapt type argument must be a type", line: 0, column: 0, path: @ctx.current_analysis_path) unless type_arg.is_a?(AST::TypeRef)

      parts = type_arg.name.parts
      type_args = type_arg.arguments.map { |a| a.value }
      interface = resolve_interface_ref(AST::QualifiedName.new(parts:, type_arguments: type_args))
      dyn_type = Types::Dyn.new(interface, interface.respond_to?(:type_arguments) ? (interface.type_arguments || []) : [])
      return [:adapt, nil, nil, dyn_type, interface]
    end
  end

  if (callable_resolution = resolve_specialized_callable_binding(callee, env:))
    callable_kind, function_binding, receiver, method_entry_receiver_type = callable_resolution
    if callable_kind == :method
      return [
        :method,
        function_binding_c_name(function_binding, module_name: function_binding.owner.module_name, receiver_type: method_entry_receiver_type),
        receiver,
        function_binding.type,
        function_binding,
      ]
    end

    if function_binding.external
      return [:function, external_function_c_name(function_binding), nil, function_binding.type, function_binding]
    end

    return [:function, function_binding_c_name(function_binding, module_name: function_binding.owner.module_name), nil, function_binding.type, function_binding]
  end

  if (type_ref = type_ref_from_specialization(callee))
    specialized_type = resolve_type_ref(type_ref)
    return [:struct_literal, nil, nil, specialized_type] if specialized_type.is_a?(Types::Struct) || task_type?(specialized_type) || specialized_type.is_a?(Types::Vector) || specialized_type.is_a?(Types::Matrix) || specialized_type.is_a?(Types::Quaternion) || specialized_type.is_a?(Types::Simd)
  end

  raise LoweringError.new("unsupported specialization callee", line: 0, column: 0, path: @ctx.current_analysis_path)
end

#resolve_specialization_type_arguments(expression) ⇒ Object 



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# File 'lib/milk_tea/core/lowering/resolve.rb', line 1450

def resolve_specialization_type_arguments(expression)
  expression.arguments.map do |argument|
    resolve_type_argument(argument.value)
  end
end

#resolve_specialized_callable_binding(expression, env:) ⇒ Object 



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# File 'lib/milk_tea/core/lowering/resolve.rb', line 1204

def resolve_specialized_callable_binding(expression, env:)
  callable_kind = :function
  receiver = nil
  receiver_type = nil
  binding = case expression.callee
            when AST::Identifier
              @ctx.functions[expression.callee.name]
            when AST::MemberAccess
              if expression.callee.receiver.is_a?(AST::Identifier) && @ctx.imports.key?(expression.callee.receiver.name)
                @ctx.imports.fetch(expression.callee.receiver.name).functions[expression.callee.member]
              elsif (type_expr = resolve_type_expression(expression.callee.receiver))
                dispatch_receiver_type = method_dispatch_receiver_type(type_expr)
                method_entry_receiver_type = type_expr
                method_entry = @method_definitions[[type_expr, expression.callee.member]]
                method_entry ||= @method_definitions[[type_expr, "static:#{expression.callee.member}"]]
                unless method_entry || dispatch_receiver_type == type_expr
                  method_entry_receiver_type = dispatch_receiver_type
                  method_entry = @method_definitions[[dispatch_receiver_type, expression.callee.member]]
                  method_entry ||= @method_definitions[[dispatch_receiver_type, "static:#{expression.callee.member}"]]
                end
                if method_entry
                  method_analysis, method_ast = method_entry
                  method_binding = method_analysis.methods.fetch(method_entry_receiver_type).fetch(method_analysis_key(method_ast))
                  if method_binding.type.receiver_type.nil?
                    receiver_type = type_expr
                    method_binding
                  end
                end
              else
                resolved_receiver_type = infer_method_receiver_type(expression.callee.receiver, env:, member_name: expression.callee.member)
                dispatch_receiver_type = method_dispatch_receiver_type(resolved_receiver_type)
                method_entry_receiver_type = resolved_receiver_type
                method_entry = @method_definitions[[resolved_receiver_type, expression.callee.member]]
                unless method_entry || dispatch_receiver_type == resolved_receiver_type
                  method_entry_receiver_type = dispatch_receiver_type
                  method_entry = @method_definitions[[dispatch_receiver_type, expression.callee.member]]
                end
                if method_entry
                  method_analysis, method_ast = method_entry
                  callable_kind = :method
                  receiver = expression.callee.receiver
                  receiver_type = resolved_receiver_type
                  method_analysis.methods.fetch(method_entry_receiver_type).fetch(method_analysis_key(method_ast))
                end
              end
            end
  return nil unless binding

  type_arguments = resolve_specialization_type_arguments(expression)
  [callable_kind, instantiate_function_binding_with_receiver(binding, type_arguments, receiver_type:), receiver, method_entry_receiver_type]
end

#resolve_struct_handle_argument(expression, env:) ⇒ Object 



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# File 'lib/milk_tea/core/lowering/resolve.rb', line 1913

def resolve_struct_handle_argument(expression, env:)
  type = reflection_type_from_expression(expression, env:)
  return nil unless type

  struct_handle_for_type(type)
end

#resolve_type_argument(argument, type_params: current_type_params) ⇒ Object 



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# File 'lib/milk_tea/core/lowering/resolve.rb', line 1456

def resolve_type_argument(argument, type_params: current_type_params)
  case argument
  when AST::TypeRef
    resolve_type_argument_ref(argument, type_params:)
  when AST::FunctionType, AST::ProcType, AST::TupleType
    resolve_type_ref(argument, type_params:)
  when AST::IntegerLiteral, AST::FloatLiteral
    Types::LiteralTypeArg.new(argument.value)
  else
    raise LoweringError.new("unsupported type argument #{argument.class.name}", line: 0, column: 0, path: @ctx.current_analysis_path)
  end
end

#resolve_type_argument_ref(type_ref, type_params:) ⇒ Object 



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# File 'lib/milk_tea/core/lowering/resolve.rb', line 1469

def resolve_type_argument_ref(type_ref, type_params:)
  return resolve_type_ref(type_ref, type_params:) unless literal_type_argument_name_candidate?(type_ref)

  result = try_resolve_type_ref(type_ref, type_params:)
  return result if result

  literal_type_argument = resolve_named_literal_type_argument(type_ref)
  return literal_type_argument if literal_type_argument

  resolve_type_ref(type_ref, type_params:)
end

#resolve_type_expression(expression) ⇒ Object 



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# File 'lib/milk_tea/core/lowering/resolve.rb', line 1162

def resolve_type_expression(expression)
  case expression
  when AST::Identifier
    return current_type_params[expression.name] if current_type_params.key?(expression.name)

    lookup_named_type(expression.name)
  when AST::MemberAccess
    return nil unless expression.receiver.is_a?(AST::Identifier)

    if @ctx.imports.key?(expression.receiver.name)
      return @ctx.imports.fetch(expression.receiver.name).types[expression.member]
    end

    parent_type = @ctx.types[expression.receiver.name]
    return parent_type.nested_types[expression.member] if parent_type.respond_to?(:nested_types) && parent_type.nested_types.key?(expression.member)

    nil
  when AST::Specialization
    type_ref = type_ref_from_specialization(expression)
    return nil unless type_ref

    resolve_type_ref(type_ref)
  end
end

#resolve_type_member(type, name) ⇒ Object 



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# File 'lib/milk_tea/core/lowering/resolve.rb', line 1187

def resolve_type_member(type, name)
  case type
  when Types::Enum, Types::Flags
    type.member(name)
  when Types::Variant
    type if type.arm_names.include?(name)
  end
end

#resolve_type_member_const_value(expression) ⇒ Object 



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# File 'lib/milk_tea/core/lowering/resolve.rb', line 1524

def resolve_type_member_const_value(expression)
  type = resolve_type_expression(expression.receiver)
  return unless type.is_a?(Types::EnumBase)

  type.member_value(expression.member)
end

#resolve_type_ref(type_ref, type_params: current_type_params) ⇒ Object

Raises:



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# File 'lib/milk_tea/core/lowering/resolve.rb', line 2489

def resolve_type_ref(type_ref, type_params: current_type_params)
  if type_ref.is_a?(AST::FunctionType)
    params = type_ref.params.map do |param|
      Types::Registry.parameter(param.name, resolve_type_ref(param.type, type_params:))
    end
    return Types::Registry.function(nil, params:, return_type: resolve_type_ref(type_ref.return_type, type_params:))
  end

  if type_ref.is_a?(AST::ProcType)
    params = type_ref.params.map do |param|
      Types::Registry.parameter(param.name, resolve_type_ref(param.type, type_params:))
    end
    return Types::Registry.proc(params:, return_type: resolve_type_ref(type_ref.return_type, type_params:))
  end

  if type_ref.is_a?(AST::DynType)
    interface = resolve_interface_ref(type_ref.interface)
    raise LoweringError.new("generic interface requires type arguments", line: 0, column: 0, path: @ctx.current_analysis_path) if interface.respond_to?(:instantiate)
    type_arguments = interface.respond_to?(:type_arguments) ? (interface.type_arguments || []) : []
    return Types::Dyn.new(interface, type_arguments)
  end

  if type_ref.is_a?(AST::TupleType)
    names = []
    element_types = []
    type_ref.element_types.each do |et|
      if et.is_a?(AST::Argument)
        names << et.name
        element_types << resolve_type_ref(et.value, type_params:)
      else
        names << nil
        element_types << resolve_type_ref(et, type_params:)
      end
    end
    has_named = names.any?
    return Types::Registry.tuple(element_types, field_names: has_named ? names : nil)
  end

  parts = type_ref.name.parts
  base = if type_ref.arguments.any?
            name = parts.join(".")
            args = type_ref.arguments.map { |argument| resolve_type_argument(argument.value, type_params:) }
            if name != "ref" && args.any? { |argument| contains_ref_type?(argument) && !stored_ref_supported_type?(argument) }
              raise LoweringError.new("ref types cannot be nested inside #{name}", line: 0, column: 0, path: @ctx.current_analysis_path)
            end
            if name == "Task"
              validate_generic_type!(name, args)
              Types::Registry.task(args.fetch(0))
            elsif (generic_type = resolve_named_generic_type(parts))
              generic_type.instantiate(args)
            elsif name == "span"
              Types::Registry.span(args.fetch(0))
            elsif name == "SoA"
              validate_generic_type!(name, args)
              Types::Registry.soa(args.fetch(0), count: args.fetch(1).value)
            elsif name == "simd"
              validate_generic_type!(name, args)
              Types::Registry.simd(args.fetch(0), lane_count: args.fetch(1).value)
            else
              validate_generic_type!(name, args)
              args = [type_ref.lifetime] + args if name == "ref" && type_ref.lifetime
              Types::Registry.generic_instance(name, args)
            end
          elsif parts.length == 1 && type_params.key?(parts.first)
            type_params.fetch(parts.first)
          elsif parts.length == 1
            type = lookup_named_type(parts.first)
            raise LoweringError.new("unknown type #{parts.first}", line: 0, column: 0, path: @ctx.current_analysis_path) unless type
            raise LoweringError.new("generic type #{parts.first} requires type arguments", line: 0, column: 0, path: @ctx.current_analysis_path) if type.is_a?(Types::GenericStructDefinition) || type.is_a?(Types::GenericVariantDefinition)

            type
    elsif parts.length >= 2
      type = resolve_nested_type_ref(parts)

      unless type
        if @ctx.imports.key?(parts.first)
          imported_module = @ctx.imports.fetch(parts.first)
          if imported_module.private_type?(parts.last)
            raise LoweringError.new("#{parts.first}.#{parts.last} is private to module #{imported_module.name}", line: 0, column: 0, path: @ctx.current_analysis_path)
          end

          type = imported_module.types[parts.last]
          raise LoweringError.new("unknown type #{type_ref.name}", line: 0, column: 0, path: @ctx.current_analysis_path) unless type
          raise LoweringError.new("generic type #{type_ref.name} requires type arguments", line: 0, column: 0, path: @ctx.current_analysis_path) if type.is_a?(Types::GenericStructDefinition) || type.is_a?(Types::GenericVariantDefinition)
        elsif @type_resolution_env && (field_type = resolve_field_handle_type_ref(parts))
          type = field_type
        else
          raise LoweringError.new("unknown type #{type_ref.name}", line: 0, column: 0, path: @ctx.current_analysis_path)
        end
      end

      type
    else
      raise LoweringError.new("unknown type #{type_ref.name}", line: 0, column: 0, path: @ctx.current_analysis_path)
    end

    raise LoweringError.new("ref types are non-null and cannot be nullable", line: 0, column: 0, path: @ctx.current_analysis_path) if type_ref.nullable && ref_type?(base)

    type_ref.nullable ? Types::Registry.nullable(base) : base
end

#resolve_type_ref_for_analysis(type_ref, analysis, type_params: current_type_params) ⇒ Object 



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# File 'lib/milk_tea/core/lowering/resolve.rb', line 2457

def resolve_type_ref_for_analysis(type_ref, analysis, type_params: current_type_params)
  saved = @ctx.save
  @ctx.install(analysis)
  @ctx.module_prefix = module_c_prefix(@ctx.module_name)
  resolve_type_ref(type_ref, type_params:)
ensure
  @ctx.restore(saved)
end

#resolved_attribute_applications_for_target(target) ⇒ Object 



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# File 'lib/milk_tea/core/lowering/resolve.rb', line 2024

def resolved_attribute_applications_for_target(target)
  target_id = case target
  when Types::StructHandle then target.declaration.object_id
  when Types::FieldHandle then target.field_declaration.object_id
  when Types::CallableHandle then target.declaration.object_id
  end
  return [] unless target_id

  applications = @ctx.attribute_applications[target_id]
  return applications if applications

  @ctx.imports.each_value do |imported_module|
    applications = imported_module.attribute_applications[target_id]
    return applications if applications
  end

  []
end

#same_attribute_binding?(left, right) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/milk_tea/core/lowering/resolve.rb', line 2049

def same_attribute_binding?(left, right)
  left.name == right.name && left.module_name == right.module_name
end

#simulate_cstr_metadata_block(statements, env:) ⇒ Object 



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# File 'lib/milk_tea/core/lowering/resolve.rb', line 297

def simulate_cstr_metadata_block(statements, env:)
  simulated_env = duplicate_env(env)

  statements.each do |statement|
    case statement
    when AST::LocalDecl
      storage_type = if statement.else_body
                        infer_expression_type(statement.value, env: simulated_env)
                      elsif statement.type
                        resolve_type_ref(statement.type)
                      else
                        infer_expression_type(statement.value, env: simulated_env)
                      end
      type = if statement.else_body
                statement.type ? resolve_type_ref(statement.type) : let_else_success_type(storage_type)
              else
                storage_type
              end
      unless let_else_discards_binding?(statement)
        current_actual_scope(simulated_env[:scopes])[statement.name] = local_binding(
          type:,
          storage_type:,
          linkage_name: c_local_name(statement.name),
          mutable: statement.kind == :var,
          pointer: false,
          projection: statement.else_body ? let_else_binding_projection(storage_type) : nil,
          cstr_backed: cstr_backed_storage_value?(storage_type, statement.value, simulated_env),
          cstr_list_backed: cstr_list_backed_storage_value?(storage_type, statement.value, simulated_env),
          const_value: statement.else_body ? nil : statement.kind == :let && statement.value ? compile_time_const_value(statement.value, env: simulated_env) : nil,
        )
      end
    when AST::Assignment
      update_cstr_metadata_for_assignment!(statement, statement.value, simulated_env)
    when AST::IfStmt
      merge_cstr_metadata_after_if_statement!(statement, simulated_env)
    when AST::UnsafeStmt
      nested_env = simulate_cstr_metadata_block(statement.body, env: simulated_env)
      return nil unless nested_env

      copy_cstr_metadata!(simulated_env, nested_env)
    when AST::ReturnStmt, AST::BreakStmt, AST::ContinueStmt
      return nil
    end
  end

  simulated_env
end

#specialize_function_binding(binding, arguments, env, receiver_type: nil) ⇒ Object

Raises:



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# File 'lib/milk_tea/core/lowering/resolve.rb', line 2057

def specialize_function_binding(binding, arguments, env, receiver_type: nil)
  return binding if binding.type_params.empty?
  raise LoweringError.new("generic function #{binding.name} must be called", line: 0, column: 0, path: @ctx.current_analysis_path) unless arguments

  type_arguments = infer_function_type_arguments(binding, arguments, env, receiver_type:)
  instantiate_function_binding(binding, type_arguments)
end

#struct_handle_for_type(type) ⇒ Object 



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# File 'lib/milk_tea/core/lowering/resolve.rb', line 1944

def struct_handle_for_type(type)
  base_type = type.is_a?(Types::StructInstance) ? type.definition : type
  return nil unless base_type.is_a?(Types::Struct) || base_type.is_a?(Types::GenericStructDefinition)
  return nil unless base_type.respond_to?(:module_name)

  analysis = analysis_for_module(base_type.module_name)
  declaration = find_struct_decl_by_name(analysis.ast.declarations, base_type.name)
  return nil unless declaration

  Types::StructHandle.new(base_type, declaration)
end

#substitute_type(type, substitutions) ⇒ Object 



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# File 'lib/milk_tea/core/lowering/resolve.rb', line 2423

def substitute_type(type, substitutions)
  Types::SubstituteTypeVisitor.new(substitutions).apply(type)
end

#substitute_value_binding(binding, substitutions) ⇒ Object 



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# File 'lib/milk_tea/core/lowering/resolve.rb', line 2411

def substitute_value_binding(binding, substitutions)
  Bindings::ValueBinding.new(
    id: binding.id,
    name: binding.name,
    storage_type: substitute_type(binding.storage_type, substitutions),
    flow_type: binding.flow_type ? substitute_type(binding.flow_type, substitutions) : nil,
    mutable: binding.mutable,
    kind: binding.kind,
    const_value: binding.const_value,
  )
end

#trackable_binding_names(env) ⇒ Object 



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# File 'lib/milk_tea/core/lowering/resolve.rb', line 370

def trackable_binding_names(env)
  env[:scopes].each_with_object([]) do |scope, names|
    next if scope.is_a?(FlowScope)

    scope.each do |name, binding|
      next unless cstr_trackable_type?(binding[:type]) || cstr_list_trackable_type?(binding[:type])

      names << name unless names.include?(name)
    end
  end
end

#try_resolve_type_ref(type_ref, type_params:) ⇒ Object 



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# File 'lib/milk_tea/core/lowering/resolve.rb', line 1481

def try_resolve_type_ref(type_ref, type_params:)
  resolve_type_ref(type_ref, type_params:)
rescue LoweringError
  nil
end

#type_contains_array_storage?(type) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/milk_tea/core/lowering/resolve.rb', line 1061

def type_contains_array_storage?(type)
  visitor = Types::ContainsArrayStorageVisitor.new
  visitor.visit(type)
  visitor.found?
end

#type_implements_interface?(type, interface) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/milk_tea/core/lowering/resolve.rb', line 2151

def type_implements_interface?(type, interface)
  key = interface_implementation_key(type)
  return true if @ctx.implemented_interfaces.fetch(key, []).include?(interface)

  @ctx.imports.each_value do |module_binding|
    return true if module_binding.implemented_interfaces.fetch(key, []).include?(interface)
  end

  false
end

#types_for_module(module_name) ⇒ Object 



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# File 'lib/milk_tea/core/lowering/resolve.rb', line 2441

def types_for_module(module_name)
  @program.analyses_by_module_name.fetch(module_name).types
end

#update_cstr_metadata_for_assignment!(statement, prepared_value, env) ⇒ Object 



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# File 'lib/milk_tea/core/lowering/resolve.rb', line 236

def update_cstr_metadata_for_assignment!(statement, prepared_value, env)
  if statement.target.is_a?(AST::Identifier)
    binding = lookup_value(statement.target.name, env)
    return unless binding

    replace_binding_cstr_metadata!(
      statement.target.name,
      env,
      cstr_backed: statement.operator == "=" ? cstr_backed_storage_value?(binding[:type], prepared_value, env) : false,
      cstr_list_backed: statement.operator == "=" ? cstr_list_backed_storage_value?(binding[:type], prepared_value, env) : false,
    )
    return
  end

  return unless statement.target.is_a?(AST::IndexAccess) && statement.target.receiver.is_a?(AST::Identifier)

  binding = lookup_value(statement.target.receiver.name, env)
  return unless binding && cstr_list_trackable_type?(binding[:type])

  replace_binding_cstr_metadata!(statement.target.receiver.name, env, cstr_backed: binding_cstr_backed?(binding), cstr_list_backed: false)
end

#validate_function_type_param_constraints!(binding, substitutions) ⇒ Object 



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# File 'lib/milk_tea/core/lowering/resolve.rb', line 2131

def validate_function_type_param_constraints!(binding, substitutions)
  binding.type_param_constraints.each do |name, constraints|
    actual_type = substitutions[name]
    raise LoweringError.new("cannot infer type argument #{name} for function #{binding.name}", line: 0, column: 0, path: @ctx.current_analysis_path) unless actual_type

    constraints.interfaces.each do |interface|
      next if type_implements_interface?(actual_type, interface)

      raise LoweringError.new("type #{actual_type} does not implement interface #{interface.name} for function #{binding.name}", line: 0, column: 0, path: @ctx.current_analysis_path)
    end
  end
end

#validate_methods_receiver_type_arguments!(type_ref, generic_type) ⇒ Object 



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# File 'lib/milk_tea/core/lowering/resolve.rb', line 2205

def validate_methods_receiver_type_arguments!(type_ref, generic_type)
  names = type_ref.arguments.map do |argument|
    value = argument.value
    next unless value.is_a?(AST::TypeRef)
    next unless value.arguments.empty? && !value.nullable && value.name.parts.length == 1

    value.name.parts.first
  end

  expected_names = generic_type.type_params
  unless names == expected_names
    raise LoweringError.new("extending target #{type_ref} must use the receiver type parameters directly", line: 0, column: 0, path: @ctx.current_analysis_path)
  end

  expected_names
end

#value_param_declared_type(name) ⇒ Object 



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# File 'lib/milk_tea/core/lowering/resolve.rb', line 2475

def value_param_declared_type(name)
  return nil unless value_param_substitution(name)

  @ctx.current_value_type_params&.[](name)
end

#value_param_literal(name, expected_type = nil) ⇒ Object 



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# File 'lib/milk_tea/core/lowering/resolve.rb', line 2481

def value_param_literal(name, expected_type = nil)
  substitution = value_param_substitution(name)
  return nil unless substitution && substitution.value.is_a?(Integer)

  type = @ctx.current_value_type_params&.[](name) || expected_type || @ctx.types.fetch("int")
  IR::IntegerLiteral.new(value: substitution.value, type:)
end

#value_param_substitution(name) ⇒ Object 



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# File 'lib/milk_tea/core/lowering/resolve.rb', line 2470

def value_param_substitution(name)
  substitution = current_type_params[name]
  substitution.is_a?(Types::LiteralTypeArg) ? substitution : nil
end