Module: MilkTea::LowererFunctions

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

Instance Method Summary collapse

Instance Method Details

#lower_async_function_decl(binding, receiver_type: nil) ⇒ Object 



180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
 
# File 'lib/milk_tea/core/lowering/functions.rb', line 180

def lower_async_function_decl(binding, receiver_type: nil)
  decl = binding.ast
  normalized_statements = normalize_async_body(binding, decl.body)
  constructor_linkage_name = function_binding_c_name(binding, module_name: @ctx.module_name, receiver_type:)
  frame_linkage_name = "#{constructor_linkage_name}__frame"
  resume_linkage_name = "#{constructor_linkage_name}__resume"
  ready_linkage_name = "#{constructor_linkage_name}__ready"
  set_waiter_linkage_name = "#{constructor_linkage_name}__set_waiter"
  release_linkage_name = "#{constructor_linkage_name}__release"
  take_result_linkage_name = "#{constructor_linkage_name}__take_result"
  cancel_linkage_name = "#{constructor_linkage_name}__cancel"

  async_info = analyze_async_function(binding, normalized_statements)
  frame_type = build_async_frame_type(frame_linkage_name, async_info)

  @artifacts.synthetic_structs << IR::StructDecl.new(
    name: frame_linkage_name,
    linkage_name: frame_linkage_name,
    fields: frame_type.fields.map { |field_name, field_type| IR::Field.new(name: field_name, type: field_type) },
    packed: false,
    alignment: nil,
  )
  @artifacts.synthetic_functions << build_async_resume_function(binding, normalized_statements, frame_type, resume_linkage_name, async_info)
  @artifacts.synthetic_functions << build_async_ready_function(frame_type, ready_linkage_name, async_info)
  @artifacts.synthetic_functions << build_async_set_waiter_function(frame_type, set_waiter_linkage_name, async_info)
  @artifacts.synthetic_functions << build_async_release_function(frame_type, release_linkage_name, async_info)
  @artifacts.synthetic_functions << build_async_take_result_function(frame_type, take_result_linkage_name, async_info)
  @artifacts.synthetic_functions << build_async_cancel_function(frame_type, cancel_linkage_name, async_info)

  if root_main_entrypoint_signature(binding)
    @artifacts.synthetic_functions << build_async_constructor_function(
      binding,
      decl,
      frame_type,
      constructor_linkage_name,
      resume_linkage_name,
      ready_linkage_name,
      set_waiter_linkage_name,
      release_linkage_name,
      take_result_linkage_name,
      cancel_linkage_name,
      async_info,
    )

    return build_async_main_entrypoint(binding, constructor_linkage_name, async_info)
  end

  build_async_constructor_function(
    binding,
    decl,
    frame_type,
    constructor_linkage_name,
    resume_linkage_name,
    ready_linkage_name,
    set_waiter_linkage_name,
    release_linkage_name,
    take_result_linkage_name,
    cancel_linkage_name,
    async_info,
  )
end

#lower_function_decl(binding, receiver_type: nil) ⇒ Object 



113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
 
# File 'lib/milk_tea/core/lowering/functions.rb', line 113

def lower_function_decl(binding, receiver_type: nil)
  decl = binding.ast
  params = []
  env = empty_env
  parameter_setup = []
  previous_type_substitutions = @ctx.current_type_substitutions
  @ctx.current_type_substitutions = binding.type_substitutions

  return lower_async_function_decl(binding, receiver_type:) if binding.async

  receiver_by_pointer = pointer_lowered_sync_method_receiver?(binding)

  body_params = binding.body_params.dup
  if binding.type.receiver_type
    receiver_binding = body_params.shift
    linkage_name = c_local_name(receiver_binding.name)
    env[:scopes].last[receiver_binding.name] = local_binding(
      type: receiver_binding.type,
      linkage_name:,
      mutable: receiver_binding.mutable,
      pointer: receiver_by_pointer,
    )
    params << IR::Param.new(
      name: receiver_binding.name,
      linkage_name:,
      type: receiver_binding.type,
      pointer: receiver_by_pointer,
    )
  end

  body_params.each_with_index do |param_binding, index|
    type = param_binding.type

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

  return_type = binding.type.return_type
  body = lower_block(decl.body, env:, active_defers: [], return_type:, loop_flow: nil, allow_return: true)
  body = parameter_setup + body

  IR::Function.new(
    name: decl.name,
    linkage_name: function_binding_c_name(binding, module_name: @ctx.module_name, receiver_type:),
    params:,
    return_type:,
    body:,
    entry_point: false,
    method_receiver_param: !binding.type.receiver_type.nil?,
  )
ensure
  @ctx.current_type_substitutions = previous_type_substitutions
end

#lower_functions ⇒ Object 



11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
 
# File 'lib/milk_tea/core/lowering/functions.rb', line 11

def lower_functions
  lowered = []
  cursor = 0
  declarations = @ctx.ast.declarations

  while cursor < declarations.length
    expanded_declarations.each do |decl|
      case decl
      when AST::FunctionDef
        binding = @ctx.functions.fetch(decl.name)
        next if binding.body_return_type == Types::BUILTIN_TYPE_META_TYPE
        if binding.type_params.any?
          binding.instances.values.sort_by { |instance| instance.type_arguments.map(&:to_s).join(",") }.each do |instance|
            linkage_name = function_binding_c_name(instance, module_name: @ctx.module_name)
            next if @artifacts.lowered_function_linkage_names[linkage_name]

            lowered << lower_function_decl(instance)
            @artifacts.lowered_function_linkage_names[linkage_name] = true
          end
        else
          linkage_name = function_binding_c_name(binding, module_name: @ctx.module_name)
          next if @artifacts.lowered_function_linkage_names[linkage_name]

          lowered << lower_function_decl(binding)
          @artifacts.lowered_function_linkage_names[linkage_name] = true
          if @ctx.module_name.to_s == @program.root_analysis.module_name.to_s
            if (entrypoint = build_root_main_entrypoint(binding))
              next if @artifacts.lowered_function_linkage_names[entrypoint.linkage_name]

              lowered << entrypoint
              @artifacts.lowered_function_linkage_names[entrypoint.linkage_name] = true
            end
          end
        end
      when AST::ExtendingBlock
        receiver_type = resolve_extending_receiver_type(@ctx.analysis, decl.type_name)
        methods_hash = @ctx.methods[receiver_type]
        unless methods_hash
          methods_hash = @ctx.methods.find { |k, _| k.to_s == receiver_type.to_s }&.last
        end
        next unless methods_hash
        decl.methods.each do |method|
          binding = methods_hash[method.kind == :static ? "static:#{method.name}" : method.name]
          next unless binding
          if binding.type_params.any?
            binding.instances.values.sort_by { |instance| instance.type_arguments.map(&:to_s).join(",") }.each do |instance|
              linkage_name = function_binding_c_name(instance, module_name: @ctx.module_name, receiver_type:)
              next if @artifacts.lowered_function_linkage_names[linkage_name]

              lowered << lower_function_decl(instance, receiver_type:)
              @artifacts.lowered_function_linkage_names[linkage_name] = true
            end
          else
            linkage_name = function_binding_c_name(binding, module_name: @ctx.module_name, receiver_type:)
            next if @artifacts.lowered_function_linkage_names[linkage_name]

            lowered << lower_function_decl(binding, receiver_type:)
            @artifacts.lowered_function_linkage_names[linkage_name] = true
          end
        end
      end
    end

    cursor = declarations.length
  end

  lowered
end

#resolve_extending_receiver_type(analysis, type_name) ⇒ Object

Raises:



80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
 
# File 'lib/milk_tea/core/lowering/functions.rb', line 80

def resolve_extending_receiver_type(analysis, type_name)
  if type_name.is_a?(AST::TypeRef)
    generic_type = resolve_named_generic_type_for_analysis(analysis, type_name.name.parts)
    if generic_type.is_a?(Types::GenericStructDefinition) || generic_type.is_a?(Types::GenericVariantDefinition)
      validate_methods_receiver_type_arguments!(type_name, generic_type)
      return generic_type
    end

    begin
      return method_dispatch_receiver_type(resolve_type_ref_for_analysis(type_name, analysis))
    rescue LoweringError => error
      receiver_type_param_names = methods_receiver_type_argument_names!(type_name)
      raise error if receiver_type_param_names.empty?

      receiver_type_params = receiver_type_param_names.to_h { |name| [name, Types::TypeVar.new(name)] }
      receiver_type = resolve_type_ref_for_analysis(type_name, analysis, type_params: receiver_type_params)
      return method_dispatch_receiver_type(receiver_type)
    end
  end

  parts = type_name.name.parts
  if parts.length == 1
    return types_for_module(analysis.module_name).fetch(parts.first)
  end

  if parts.length == 2
    imported_module = imports_for_module(analysis.module_name).fetch(parts.first)
    return imported_module.types.fetch(parts.last)
  end

  raise LoweringError.new("unsupported extending target #{type_name}", line: 0, column: 0, path: @ctx.current_analysis_path)
end