Module: MilkTea::LowererForeignCstr

Included in:
Lowerer
Defined in:
lib/milk_tea/core/lowering/foreign_cstr.rb

Instance Method Summary collapse

Instance Method Details

#inlineable_foreign_argument_expression?(expression) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/milk_tea/core/lowering/foreign_cstr.rb', line 141

def inlineable_foreign_argument_expression?(expression)
  case expression
  when IR::Name, IR::IntegerLiteral, IR::FloatLiteral, IR::StringLiteral, IR::BooleanLiteral, IR::NullLiteral, IR::ZeroInit, IR::SizeofExpr, IR::AlignofExpr, IR::OffsetofExpr
    true
  when IR::Call
    return false if temporary_foreign_cstr_expression?(expression)

    callee_inlineable = expression.callee.is_a?(String) || inlineable_foreign_argument_expression?(expression.callee)
    callee_inlineable && expression.arguments.all? { |argument| inlineable_foreign_argument_expression?(argument) }
  when IR::Member
    inlineable_foreign_argument_expression?(expression.receiver)
  when IR::Index
    inlineable_foreign_argument_expression?(expression.receiver) && inlineable_foreign_argument_expression?(expression.index)
  when IR::CheckedIndex, IR::CheckedSpanIndex, IR::NullableIndex, IR::NullableSpanIndex
    inlineable_foreign_argument_expression?(expression.receiver) && inlineable_foreign_argument_expression?(expression.index)
  when IR::Unary
    inlineable_foreign_argument_expression?(expression.operand)
  when IR::Binary
    inlineable_foreign_argument_expression?(expression.left) && inlineable_foreign_argument_expression?(expression.right)
  when IR::Conditional
    inlineable_foreign_argument_expression?(expression.condition) &&
      inlineable_foreign_argument_expression?(expression.then_expression) &&
      inlineable_foreign_argument_expression?(expression.else_expression)
  when IR::ReinterpretExpr, IR::Cast
    inlineable_foreign_argument_expression?(expression.expression)
  when IR::AddressOf
    inlineable_foreign_argument_expression?(expression.expression)
  when IR::AggregateLiteral
    expression.fields.all? { |field| inlineable_foreign_argument_expression?(field.value) }
  else
    false
  end
end

#lower_contextual_expression(expression, env:, expected_type:, external_numeric: false, contextual_int_to_float: false) ⇒ Object 



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# File 'lib/milk_tea/core/lowering/foreign_cstr.rb', line 175

def lower_contextual_expression(expression, env:, expected_type:, external_numeric: false, contextual_int_to_float: false)
  if string_literal_cstr_compatibility?(expression, expected_type)
    return IR::StringLiteral.new(value: expression.value, type: expected_type, cstring: true)
  end

  lowered = lower_expression(expression, env:, expected_type: expected_type)
  return lowered unless expected_type
  if (materialized = materialize_pointer_backed_value(lowered, expected_type))
    return materialized
  end
  return lowered if lowered.type == expected_type
  return lower_direct_function_to_proc_expression(expression, lowered, env:, expected_type:) if direct_function_to_proc_contextual_compatibility?(expression, lowered.type, env:, expected_type:)
  return lower_str_buffer_to_span_expression(lowered, expected_type) if str_buffer_to_span_compatible?(lowered.type, expected_type)
  return lower_array_to_span_expression(lowered, expected_type) if array_to_span_compatible?(lowered.type, expected_type)
  return cast_expression(lowered, expected_type) if contextual_numeric_compatibility?(expression, lowered.type, expected_type, env:, external_numeric:, contextual_int_to_float:)

  lowered
end

#lower_direct_foreign_cstr_list_argument_value(parameter, argument_value, env:, lowered:) ⇒ Object 



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# File 'lib/milk_tea/core/lowering/foreign_cstr.rb', line 76

def lower_direct_foreign_cstr_list_argument_value(parameter, argument_value, env:, lowered:)
  actual_type = infer_expression_type(argument_value, env:)
  return unless array_type?(actual_type)
  return unless cstr_list_backed_expression?(argument_value, env)

  boundary_type = parameter.boundary_type
  boundary_element_type = boundary_type.element_type
  len = array_length(actual_type)
  len_type = @ctx.types.fetch("ptr_uint")

  if len.zero?
    return IR::AggregateLiteral.new(
      type: boundary_type,
      fields: [
        IR::AggregateField.new(name: "data", value: IR::NullLiteral.new(type: pointer_to(boundary_element_type))),
        IR::AggregateField.new(name: "len", value: IR::IntegerLiteral.new(value: 0, type: len_type)),
      ],
    )
  end

  source = lower_expression(argument_value, env:, expected_type: actual_type)
  item_type = array_element_type(actual_type)
  items_array_type = Types::Registry.generic_instance("array", [boundary_element_type, Types::LiteralTypeArg.new(len)])
  items_name = fresh_c_temp_name(env, "foreign_cstr_items")
  items = (0...len).map do |index|
    item = IR::Index.new(
      receiver: source,
      index: IR::IntegerLiteral.new(value: index, type: len_type),
      type: item_type,
    )
    item = IR::Member.new(receiver: item, member: "data", type: pointer_to(@ctx.types.fetch("char"))) if item_type == @ctx.types.fetch("str")

    converted = foreign_identity_projection_expression(item, boundary_element_type)
    raise LoweringError.new("unsupported foreign boundary mapping #{parameter.type} as #{boundary_type}", line: 0, column: 0, path: @ctx.current_analysis_path) unless converted

    converted
  end

  lowered << IR::LocalDecl.new(
    name: items_name,
    linkage_name: items_name,
    type: items_array_type,
    value: IR::ArrayLiteral.new(type: items_array_type, elements: items),
  )

  items_ref = IR::Name.new(name: items_name, type: items_array_type, pointer: false)
  IR::AggregateLiteral.new(
    type: boundary_type,
    fields: [
      IR::AggregateField.new(
        name: "data",
        value: IR::AddressOf.new(
          expression: IR::Index.new(
            receiver: items_ref,
            index: IR::IntegerLiteral.new(value: 0, type: len_type),
            type: boundary_element_type,
          ),
          type: pointer_to(boundary_element_type),
        ),
      ),
      IR::AggregateField.new(name: "len", value: IR::IntegerLiteral.new(value: len, type: len_type)),
    ],
  )
end

#lower_foreign_cstr_list_argument_value(parameter, argument_value, env:, lowered:, cleanup:) ⇒ Object

Raises:



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# File 'lib/milk_tea/core/lowering/foreign_cstr.rb', line 5

def lower_foreign_cstr_list_argument_value(parameter, argument_value, env:, lowered:, cleanup:)
  if (direct_value = lower_direct_foreign_cstr_list_argument_value(parameter, argument_value, env:, lowered:))
    return direct_value
  end

  public_type = parameter.type
  boundary_type = parameter.boundary_type
  items_type = pointer_to(pointer_to(@ctx.types.fetch("char")))
  data_type = pointer_to(@ctx.types.fetch("char"))
  len_type = @ctx.types.fetch("ptr_uint")
  lowered_value = lower_contextual_expression(argument_value, env:, expected_type: public_type)
  items_name = fresh_c_temp_name(env, "foreign_cstr_items")
  data_name = fresh_c_temp_name(env, "foreign_cstr_data")
  len_name = fresh_c_temp_name(env, "foreign_cstr_len")

  lowered << IR::LocalDecl.new(
    name: items_name,
    linkage_name: items_name,
    type: items_type,
    value: IR::NullLiteral.new(type: items_type),
  )
  lowered << IR::LocalDecl.new(
    name: data_name,
    linkage_name: data_name,
    type: data_type,
    value: IR::NullLiteral.new(type: data_type),
  )
  lowered << IR::LocalDecl.new(
    name: len_name,
    linkage_name: len_name,
    type: len_type,
    value: IR::IntegerLiteral.new(value: 0, type: len_type),
  )
  lowered << IR::ExpressionStmt.new(
    expression: IR::Call.new(
      callee: "mt_foreign_strs_to_cstrs_temp",
      arguments: [
        lowered_value,
        IR::AddressOf.new(expression: IR::Name.new(name: items_name, type: items_type, pointer: false), type: pointer_to(items_type)),
        IR::AddressOf.new(expression: IR::Name.new(name: data_name, type: data_type, pointer: false), type: pointer_to(data_type)),
        IR::AddressOf.new(expression: IR::Name.new(name: len_name, type: len_type, pointer: false), type: pointer_to(len_type)),
      ],
      type: @ctx.types.fetch("void"),
    ),
  )
  cleanup << IR::ExpressionStmt.new(
    expression: IR::Call.new(
      callee: "mt_free_foreign_cstrs_temp",
      arguments: [
        IR::Name.new(name: items_name, type: items_type, pointer: false),
        IR::Name.new(name: data_name, type: data_type, pointer: false),
      ],
      type: @ctx.types.fetch("void"),
    ),
  )

  converted_data = foreign_identity_projection_expression(
    IR::Name.new(name: items_name, type: items_type, pointer: false),
    pointer_to(boundary_type.element_type),
  )
  raise LoweringError.new("unsupported foreign boundary mapping #{public_type} as #{boundary_type}", line: 0, column: 0, path: @ctx.current_analysis_path) unless converted_data

  IR::AggregateLiteral.new(
    type: boundary_type,
    fields: [
      IR::AggregateField.new(name: "data", value: converted_data),
      IR::AggregateField.new(name: "len", value: IR::Name.new(name: len_name, type: len_type, pointer: false)),
    ],
  )
end

#materialize_pointer_backed_value(lowered, expected_type) ⇒ Object 



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# File 'lib/milk_tea/core/lowering/foreign_cstr.rb', line 194

def materialize_pointer_backed_value(lowered, expected_type)
  return nil unless lowered.is_a?(IR::Name) && lowered.pointer
  return nil unless lowered.type == expected_type
  return nil if ref_type?(expected_type)
  return nil if pointer_type?(expected_type)

  IR::Unary.new(operator: "*", operand: lowered, type: lowered.type)
end