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| 1 // Copyright (c) 2016, the Dart project authors. Please see the AUTHORS file |
| 2 // for details. All rights reserved. Use of this source code is governed by a |
| 3 // BSD-style license that can be found in the LICENSE file. |
| 4 |
| 5 library fasta.kernel_procedure_builder; |
| 6 |
| 7 import 'package:kernel/ast.dart' show |
| 8 Arguments, |
| 9 AsyncMarker, |
| 10 Constructor, |
| 11 DartType, |
| 12 DynamicType, |
| 13 EmptyStatement, |
| 14 Expression, |
| 15 FunctionNode, |
| 16 Initializer, |
| 17 Library, |
| 18 LocalInitializer, |
| 19 Member, |
| 20 Name, |
| 21 NamedExpression, |
| 22 Procedure, |
| 23 ProcedureKind, |
| 24 RedirectingInitializer, |
| 25 Statement, |
| 26 SuperInitializer, |
| 27 TypeParameter, |
| 28 VariableDeclaration, |
| 29 VariableGet, |
| 30 VoidType, |
| 31 setParents; |
| 32 |
| 33 import 'package:kernel/type_algebra.dart' show |
| 34 containsTypeVariable, |
| 35 substitute; |
| 36 |
| 37 import '../errors.dart' show |
| 38 internalError; |
| 39 |
| 40 import '../modifier.dart' show |
| 41 abstractMask; |
| 42 |
| 43 import 'kernel_builder.dart' show |
| 44 ClassBuilder, |
| 45 ConstructorReferenceBuilder, |
| 46 FormalParameterBuilder, |
| 47 KernelFormalParameterBuilder, |
| 48 KernelTypeBuilder, |
| 49 KernelTypeVariableBuilder, |
| 50 MetadataBuilder, |
| 51 ProcedureBuilder, |
| 52 TypeBuilder, |
| 53 TypeVariableBuilder, |
| 54 memberError; |
| 55 |
| 56 abstract class KernelFunctionBuilder |
| 57 extends ProcedureBuilder<KernelTypeBuilder> { |
| 58 FunctionNode function; |
| 59 |
| 60 Statement actualBody; |
| 61 |
| 62 KernelFunctionBuilder( |
| 63 List<MetadataBuilder> metadata, |
| 64 int modifiers, KernelTypeBuilder returnType, String name, |
| 65 List<TypeVariableBuilder> typeVariables, |
| 66 List<FormalParameterBuilder> formals) |
| 67 : super(metadata, modifiers, returnType, name, typeVariables, formals); |
| 68 |
| 69 void set body(Statement newBody) { |
| 70 if (isAbstract && newBody != null) { |
| 71 return internalError("Attempting to set body on abstract method."); |
| 72 } |
| 73 actualBody = newBody; |
| 74 if (function != null) { |
| 75 function.body = newBody; |
| 76 newBody?.parent = function; |
| 77 } |
| 78 } |
| 79 |
| 80 Statement get body => actualBody ??= new EmptyStatement(); |
| 81 |
| 82 FunctionNode buildFunction() { |
| 83 assert(function == null); |
| 84 FunctionNode result = new FunctionNode(body, asyncMarker: asyncModifier); |
| 85 if (typeVariables != null) { |
| 86 for (KernelTypeVariableBuilder t in typeVariables) { |
| 87 result.typeParameters.add(t.parameter); |
| 88 } |
| 89 setParents(result.typeParameters, result); |
| 90 } |
| 91 if (formals != null) { |
| 92 for (KernelFormalParameterBuilder formal in formals) { |
| 93 VariableDeclaration parameter = formal.build(); |
| 94 if (formal.isNamed) { |
| 95 result.namedParameters.add(parameter); |
| 96 } else { |
| 97 result.positionalParameters.add(parameter); |
| 98 } |
| 99 parameter.parent = result; |
| 100 if (formal.isRequired) { |
| 101 result.requiredParameterCount++; |
| 102 } |
| 103 } |
| 104 } |
| 105 if (returnType != null) { |
| 106 result.returnType = returnType.build(); |
| 107 } |
| 108 if (!isConstructor && !isInstanceMember && parent is ClassBuilder) { |
| 109 List<TypeParameter> typeParameters = parent.target.typeParameters; |
| 110 if (typeParameters.isNotEmpty) { |
| 111 Map<TypeParameter, DartType> substitution; |
| 112 DartType removeTypeVariables(DartType type) { |
| 113 if (substitution == null) { |
| 114 substitution = <TypeParameter, DartType>{}; |
| 115 for (TypeParameter parameter in typeParameters) { |
| 116 substitution[parameter] = const DynamicType(); |
| 117 } |
| 118 } |
| 119 print("Can only use type variables in instance methods."); |
| 120 return substitute(type, substitution); |
| 121 } |
| 122 Set<TypeParameter> set = typeParameters.toSet(); |
| 123 for (VariableDeclaration parameter in result.positionalParameters) { |
| 124 if (containsTypeVariable(parameter.type, set)) { |
| 125 parameter.type = removeTypeVariables(parameter.type); |
| 126 } |
| 127 } |
| 128 for (VariableDeclaration parameter in result.namedParameters) { |
| 129 if (containsTypeVariable(parameter.type, set)) { |
| 130 parameter.type = removeTypeVariables(parameter.type); |
| 131 } |
| 132 } |
| 133 if (containsTypeVariable(result.returnType, set)) { |
| 134 result.returnType = removeTypeVariables(result.returnType); |
| 135 } |
| 136 } |
| 137 } |
| 138 return function = result; |
| 139 } |
| 140 |
| 141 Member build(Library library); |
| 142 } |
| 143 |
| 144 class KernelProcedureBuilder extends KernelFunctionBuilder { |
| 145 final Procedure procedure; |
| 146 |
| 147 AsyncMarker actualAsyncModifier; |
| 148 |
| 149 final ConstructorReferenceBuilder redirectionTarget; |
| 150 |
| 151 KernelProcedureBuilder( |
| 152 List<MetadataBuilder> metadata, |
| 153 int modifiers, KernelTypeBuilder returnType, String name, |
| 154 List<TypeVariableBuilder> typeVariables, |
| 155 List<FormalParameterBuilder> formals, this.actualAsyncModifier, |
| 156 ProcedureKind kind, [this.redirectionTarget]) |
| 157 : procedure = new Procedure(null, kind, null), |
| 158 super(metadata, modifiers, returnType, name, typeVariables, formals); |
| 159 |
| 160 ProcedureKind get kind => procedure.kind; |
| 161 |
| 162 AsyncMarker get asyncModifier => actualAsyncModifier; |
| 163 |
| 164 Statement get body { |
| 165 if (actualBody == null && redirectionTarget == null && !isAbstract && |
| 166 !isExternal) { |
| 167 actualBody = new EmptyStatement(); |
| 168 } |
| 169 return actualBody; |
| 170 } |
| 171 |
| 172 void set asyncModifier(AsyncMarker newModifier) { |
| 173 actualAsyncModifier = newModifier; |
| 174 if (function != null) { |
| 175 // No parent, it's an enum. |
| 176 function.asyncMarker = actualAsyncModifier; |
| 177 } |
| 178 } |
| 179 |
| 180 Procedure build(Library library) { |
| 181 // TODO(ahe): I think we may call this twice on parts. Investigate. |
| 182 if (procedure.name == null) { |
| 183 procedure.function = buildFunction(); |
| 184 procedure.function.parent = procedure; |
| 185 procedure.isAbstract = isAbstract; |
| 186 procedure.isStatic = isStatic; |
| 187 procedure.isExternal = isExternal; |
| 188 procedure.isConst = isConst; |
| 189 procedure.name = new Name(name, library); |
| 190 } |
| 191 return procedure; |
| 192 } |
| 193 |
| 194 KernelFunctionBuilder toConstructor(String name, |
| 195 List<TypeVariableBuilder> classTypeVariables) { |
| 196 assert(procedure.name == null); |
| 197 assert(actualBody == null); |
| 198 if (isFactory) { |
| 199 if (this.typeVariables != null) { |
| 200 return memberError(target, "Factories can't be generic."); |
| 201 } |
| 202 List<KernelTypeVariableBuilder> typeVariables; |
| 203 KernelTypeBuilder returnType = this.returnType; |
| 204 List<FormalParameterBuilder> formals; |
| 205 if (classTypeVariables != null) { |
| 206 typeVariables = <KernelTypeVariableBuilder>[]; |
| 207 for (KernelTypeVariableBuilder variable in classTypeVariables) { |
| 208 typeVariables.add(new KernelTypeVariableBuilder(variable.name)); |
| 209 } |
| 210 Map<TypeVariableBuilder, TypeBuilder> substitution = |
| 211 <TypeVariableBuilder, TypeBuilder>{}; |
| 212 int i = 0; |
| 213 for (KernelTypeVariableBuilder variable in classTypeVariables) { |
| 214 substitution[variable] = typeVariables[i++].asTypeBuilder(); |
| 215 } |
| 216 i = 0; |
| 217 for (KernelTypeVariableBuilder variable in classTypeVariables) { |
| 218 typeVariables[i++].bound = variable?.bound?.subst(substitution); |
| 219 } |
| 220 returnType = returnType?.subst(substitution); |
| 221 i = 0; |
| 222 if (this.formals != null) { |
| 223 for (KernelFormalParameterBuilder formal in this.formals) { |
| 224 KernelTypeBuilder type = formal.type?.subst(substitution); |
| 225 if (type != formal.type) { |
| 226 formals ??= this.formals.toList(); |
| 227 formals[i] = new KernelFormalParameterBuilder(formal.metadata, |
| 228 formal.modifiers, type, formal.name, formal.hasThis); |
| 229 } |
| 230 i++; |
| 231 } |
| 232 } |
| 233 } |
| 234 formals ??= this.formals; |
| 235 return new KernelProcedureBuilder( |
| 236 metadata, modifiers, returnType, name, typeVariables, formals, |
| 237 actualAsyncModifier, kind, redirectionTarget) |
| 238 ..parent = parent; |
| 239 } else { |
| 240 return new KernelConstructorBuilder(metadata, modifiers & ~abstractMask, |
| 241 returnType, name, typeVariables, formals) |
| 242 ..parent = parent; |
| 243 } |
| 244 } |
| 245 |
| 246 Procedure get target => procedure; |
| 247 } |
| 248 |
| 249 // TODO(ahe): Move this to own file? |
| 250 class KernelConstructorBuilder extends KernelFunctionBuilder { |
| 251 final Constructor constructor = new Constructor(null); |
| 252 |
| 253 bool hasMovedSuperInitializer = false; |
| 254 |
| 255 SuperInitializer superInitializer; |
| 256 |
| 257 RedirectingInitializer redirectingInitializer; |
| 258 |
| 259 KernelConstructorBuilder( |
| 260 List<MetadataBuilder> metadata, |
| 261 int modifiers, KernelTypeBuilder returnType, String name, |
| 262 List<TypeVariableBuilder> typeVariables, |
| 263 List<FormalParameterBuilder> formals) |
| 264 : super(metadata, modifiers, returnType, name, typeVariables, formals); |
| 265 |
| 266 bool get isInstanceMember => false; |
| 267 |
| 268 bool get isConstructor => true; |
| 269 |
| 270 AsyncMarker get asyncModifier => AsyncMarker.Sync; |
| 271 |
| 272 ProcedureKind get kind => null; |
| 273 |
| 274 Constructor build(Library library) { |
| 275 if (constructor.name == null) { |
| 276 constructor.function = buildFunction(); |
| 277 constructor.function.parent = constructor; |
| 278 constructor.isConst = isConst; |
| 279 constructor.isExternal = isExternal; |
| 280 constructor.name = new Name(name, library); |
| 281 } |
| 282 return constructor; |
| 283 } |
| 284 |
| 285 FunctionNode buildFunction() { |
| 286 // TODO(ahe): Should complain if another type is explicitly set. |
| 287 return super.buildFunction() |
| 288 ..returnType = const VoidType(); |
| 289 } |
| 290 |
| 291 Constructor get target => constructor; |
| 292 |
| 293 void checkSuperOrThisInitializer(Initializer initializer) { |
| 294 if (superInitializer != null || redirectingInitializer != null) { |
| 295 memberError(target, |
| 296 "Can't have more than one 'super' or 'this' initializer.", |
| 297 initializer.fileOffset); |
| 298 } |
| 299 } |
| 300 |
| 301 void addInitializer(Initializer initializer) { |
| 302 List<Initializer> initializers = constructor.initializers; |
| 303 if (initializer is SuperInitializer) { |
| 304 checkSuperOrThisInitializer(initializer); |
| 305 superInitializer = initializer; |
| 306 } else if (initializer is RedirectingInitializer) { |
| 307 checkSuperOrThisInitializer(initializer); |
| 308 redirectingInitializer = initializer; |
| 309 if (constructor.initializers.isNotEmpty) { |
| 310 memberError(target, "'this' initializer must be the only initializer.", |
| 311 initializer.fileOffset); |
| 312 } |
| 313 } else if (redirectingInitializer != null) { |
| 314 memberError(target, "'this' initializer must be the only initializer.", |
| 315 initializer.fileOffset); |
| 316 } else if (superInitializer != null) { |
| 317 // If there is a super initializer ([initializer] isn't it), we need to |
| 318 // insert [initializer] before the super initializer (thus ensuring that |
| 319 // the super initializer is always last). |
| 320 assert(superInitializer != initializer); |
| 321 assert(initializers.last == superInitializer); |
| 322 initializers.removeLast(); |
| 323 if (!hasMovedSuperInitializer) { |
| 324 // To preserve correct evaluation order, the arguments to super call |
| 325 // must be evaluated before [initializer]. Once the super initializer |
| 326 // has been moved once, the arguments are evaluated in the correct |
| 327 // order. |
| 328 hasMovedSuperInitializer = true; |
| 329 Arguments arguments = superInitializer.arguments; |
| 330 List<Expression> positional = arguments.positional; |
| 331 for (int i = 0; i < positional.length; i++) { |
| 332 VariableDeclaration variable = |
| 333 new VariableDeclaration.forValue(positional[i], isFinal: true); |
| 334 initializers.add( |
| 335 new LocalInitializer(variable)..parent = constructor); |
| 336 positional[i] = new VariableGet(variable)..parent = arguments; |
| 337 } |
| 338 for (NamedExpression named in arguments.named) { |
| 339 VariableDeclaration variable = |
| 340 new VariableDeclaration.forValue(named.value, isFinal: true); |
| 341 named.value = new VariableGet(variable)..parent = named; |
| 342 initializers.add( |
| 343 new LocalInitializer(variable)..parent = constructor); |
| 344 } |
| 345 } |
| 346 initializers.add(initializer..parent = constructor); |
| 347 initializers.add(superInitializer); |
| 348 return; |
| 349 } |
| 350 initializers.add(initializer); |
| 351 initializer.parent = constructor; |
| 352 } |
| 353 } |
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