com.sun.tools.javac.code.Types.findDescriptorSymbol()方法的使用及代码示例

x33g5p2x  于2022-01-30 转载在 其他  
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本文整理了Java中com.sun.tools.javac.code.Types.findDescriptorSymbol()方法的一些代码示例，展示了Types.findDescriptorSymbol()的具体用法。这些代码示例主要来源于Github/Stackoverflow/Maven等平台，是从一些精选项目中提取出来的代码，具有较强的参考意义，能在一定程度帮忙到你。Types.findDescriptorSymbol()方法的具体详情如下：
包路径：com.sun.tools.javac.code.Types
类名称：Types
方法名：findDescriptorSymbol

Types.findDescriptorSymbol介绍

[英]Find the method descriptor associated to this class symbol - if the symbol 'origin' is not a functional interface, an exception is thrown.
[中]查找与此类符号关联的方法描述符-如果符号“origin”不是函数接口，则会引发异常。

代码示例

代码示例来源：origin: uber/NullAway

/**
 * finds the corresponding functional interface method for a lambda expression or method reference
 *
 * @param tree the lambda expression or method reference
 * @return the functional interface method
 */
public static Symbol.MethodSymbol getFunctionalInterfaceMethod(ExpressionTree tree, Types types) {
 Preconditions.checkArgument(
   (tree instanceof LambdaExpressionTree) || (tree instanceof MemberReferenceTree));
 Type funcInterfaceType = ((JCTree.JCFunctionalExpression) tree).type;
 return (Symbol.MethodSymbol) types.findDescriptorSymbol(funcInterfaceType.tsym);
}

代码示例来源：origin: google/error-prone

@Override
public Description matchMethod(MethodTree tree, VisitorState state) {
 ClassTree enclosingClazz = ASTHelpers.findEnclosingNode(state.getPath(), ClassTree.class);
 if (tree.getModifiers().getFlags().contains(Modifier.DEFAULT)
   && IS_FUNCTIONAL_INTERFACE.matches(enclosingClazz, state)) {
  Types types = Types.instance(state.context);
  Set<Symbol> functionalSuperInterfaceSams =
    enclosingClazz.getImplementsClause().stream()
      .filter(t -> IS_FUNCTIONAL_INTERFACE.matches(t, state))
      .map(ASTHelpers::getSymbol)
      .map(TypeSymbol.class::cast)
      .map(types::findDescriptorSymbol) // TypeSymbol to single abstract method of the type
      .collect(toImmutableSet());
  // We designate an override of a superinterface SAM "behavior preserving" if it just
  // calls the SAM of this interface.
  Symbol thisInterfaceSam = types.findDescriptorSymbol(ASTHelpers.getSymbol(enclosingClazz));
  // relatively crude: doesn't verify that the same args are passed in the same order
  // so it can get false positives for behavior-preservingness (false negatives for the check)
  TreeVisitor<Boolean, VisitorState> behaviorPreserving =
    new BehaviorPreservingChecker(thisInterfaceSam);
  if (!Collections.disjoint(
      ASTHelpers.findSuperMethods(ASTHelpers.getSymbol(tree), types),
      functionalSuperInterfaceSams)
    && !tree.accept(behaviorPreserving, state)) {
   return describeMatch(tree);
  }
 }
 return Description.NO_MATCH;
}

代码示例来源：origin: org.kohsuke.sorcerer/sorcerer-javac

/**
 * Is given type a functional interface?
 */
public boolean isFunctionalInterface(TypeSymbol tsym) {
  try {
    findDescriptorSymbol(tsym);
    return true;
  } catch (FunctionDescriptorLookupError ex) {
    return false;
  }
}

代码示例来源：origin: konsoletyper/teavm-javac

/**
 * Is given type a functional interface?
 */
public boolean isFunctionalInterface(TypeSymbol tsym) {
  try {
    findDescriptorSymbol(tsym);
    return true;
  } catch (FunctionDescriptorLookupError ex) {
    return false;
  }
}

代码示例来源：origin: konsoletyper/teavm-javac

Type bridgedRefSig() {
    return types.erasure(types.findDescriptorSymbol(tree.targets.head.tsym).type);
  }
}

代码示例来源：origin: org.kohsuke.sorcerer/sorcerer-javac

Type bridgedRefSig() {
    return types.erasure(types.findDescriptorSymbol(tree.targets.head.tsym).type);
  }
}

代码示例来源：origin: org.kohsuke.sorcerer/sorcerer-javac

buf.append(types.findDescriptorSymbol(tree.type.tsym).owner.flatName());
buf.append(" ");

代码示例来源：origin: konsoletyper/teavm-javac

buf.append(types.findDescriptorSymbol(tree.type.tsym).owner.flatName());
buf.append(" ");

代码示例来源：origin: com.google.errorprone/error_prone_core

@Override
public Description matchMethod(MethodTree tree, VisitorState state) {
 ClassTree enclosingClazz = ASTHelpers.findEnclosingNode(state.getPath(), ClassTree.class);
 if (tree.getModifiers().getFlags().contains(Modifier.DEFAULT)
   && IS_FUNCTIONAL_INTERFACE.matches(enclosingClazz, state)) {
  Types types = Types.instance(state.context);
  Set<Symbol> functionalSuperInterfaceSams =
    enclosingClazz.getImplementsClause().stream()
      .filter(t -> IS_FUNCTIONAL_INTERFACE.matches(t, state))
      .map(ASTHelpers::getSymbol)
      .map(TypeSymbol.class::cast)
      .map(types::findDescriptorSymbol) // TypeSymbol to single abstract method of the type
      .collect(toImmutableSet());
  // We designate an override of a superinterface SAM "behavior preserving" if it just
  // calls the SAM of this interface.
  Symbol thisInterfaceSam = types.findDescriptorSymbol(ASTHelpers.getSymbol(enclosingClazz));
  // relatively crude: doesn't verify that the same args are passed in the same order
  // so it can get false positives for behavior-preservingness (false negatives for the check)
  TreeVisitor<Boolean, VisitorState> behaviorPreserving =
    new BehaviorPreservingChecker(thisInterfaceSam);
  if (!Collections.disjoint(
      ASTHelpers.findSuperMethods(ASTHelpers.getSymbol(tree), types),
      functionalSuperInterfaceSams)
    && !tree.accept(behaviorPreserving, state)) {
   return describeMatch(tree);
  }
 }
 return Description.NO_MATCH;
}

代码示例来源：origin: org.netbeans.api/org-netbeans-modules-java-source-base

/**
 * Find the element of the method descriptor associated to the functional interface.
 * 
 * @param origin functional interface element
 * @return associated method descriptor element or <code>null</code> if the <code>origin</code> is not a functional interface.
 * @since 2.14
 */
public ExecutableElement getDescriptorElement(TypeElement origin) {
  com.sun.tools.javac.code.Types types = com.sun.tools.javac.code.Types.instance(info.impl.getJavacTask().getContext());
  if (types.isFunctionalInterface((TypeSymbol)origin)) {
    Symbol sym = types.findDescriptorSymbol((TypeSymbol)origin);
    if (sym != null && sym.getKind() == ElementKind.METHOD) {
      return (ExecutableElement)sym;
    }
  }
  return null;
}

代码示例来源：origin: org.kohsuke.sorcerer/sorcerer-javac

public void checkFunctionalInterface(JCClassDecl tree, ClassSymbol cs) {
    Compound functionalType = cs.attribute(syms.functionalInterfaceType.tsym);

    if (functionalType != null) {
      try {
        types.findDescriptorSymbol((TypeSymbol)cs);
      } catch (Types.FunctionDescriptorLookupError ex) {
        DiagnosticPosition pos = tree.pos();
        for (JCAnnotation a : tree.getModifiers().annotations) {
          if (a.annotationType.type.tsym == syms.functionalInterfaceType.tsym) {
            pos = a.pos();
            break;
          }
        }
        log.error(pos, "bad.functional.intf.anno.1", ex.getDiagnostic());
      }
    }
  }
}

代码示例来源：origin: konsoletyper/teavm-javac

public void checkFunctionalInterface(JCClassDecl tree, ClassSymbol cs) {
    Compound functionalType = cs.attribute(syms.functionalInterfaceType.tsym);

    if (functionalType != null) {
      try {
        types.findDescriptorSymbol((TypeSymbol)cs);
      } catch (Types.FunctionDescriptorLookupError ex) {
        DiagnosticPosition pos = tree.pos();
        for (JCAnnotation a : tree.getModifiers().annotations) {
          if (a.annotationType.type.tsym == syms.functionalInterfaceType.tsym) {
            pos = a.pos();
            break;
          }
        }
        log.error(pos, "bad.functional.intf.anno.1", ex.getDiagnostic());
      }
    }
  }
}

代码示例来源：origin: org.checkerframework/dataflow

Element overriddenElement =
    com.sun.tools.javac.code.Types.instance(ctx)
        .findDescriptorSymbol(
            ((Type) trees.getTypeMirror(lambdaTreePath)).tsym);

代码示例来源：origin: org.kohsuke.sorcerer/sorcerer-javac

private void checkLambdaCandidate(JCNewClass tree, ClassSymbol csym, Type clazztype) {
  if (allowLambda &&
      identifyLambdaCandidate &&
      clazztype.hasTag(CLASS) &&
      !pt().hasTag(NONE) &&
      types.isFunctionalInterface(clazztype.tsym)) {
    Symbol descriptor = types.findDescriptorSymbol(clazztype.tsym);
    int count = 0;
    boolean found = false;
    for (Symbol sym : csym.members().getElements()) {
      if ((sym.flags() & SYNTHETIC) != 0 ||
          sym.isConstructor()) continue;
      count++;
      if (sym.kind != MTH ||
          !sym.name.equals(descriptor.name)) continue;
      Type mtype = types.memberType(clazztype, sym);
      if (types.overrideEquivalent(mtype, types.memberType(clazztype, descriptor))) {
        found = true;
      }
    }
    if (found && count == 1) {
      log.note(tree.def, "potential.lambda.found");
    }
  }
}

代码示例来源：origin: konsoletyper/teavm-javac

private void checkLambdaCandidate(JCNewClass tree, ClassSymbol csym, Type clazztype) {
  if (allowLambda &&
      identifyLambdaCandidate &&
      clazztype.hasTag(CLASS) &&
      !pt().hasTag(NONE) &&
      types.isFunctionalInterface(clazztype.tsym)) {
    Symbol descriptor = types.findDescriptorSymbol(clazztype.tsym);
    int count = 0;
    boolean found = false;
    for (Symbol sym : csym.members().getElements()) {
      if ((sym.flags() & SYNTHETIC) != 0 ||
          sym.isConstructor()) continue;
      count++;
      if (sym.kind != MTH ||
          !sym.name.equals(descriptor.name)) continue;
      Type mtype = types.memberType(clazztype, sym);
      if (types.overrideEquivalent(mtype, types.memberType(clazztype, descriptor))) {
        found = true;
      }
    }
    if (found && count == 1) {
      log.note(tree.def, "potential.lambda.found");
    }
  }
}

代码示例来源：origin: konsoletyper/teavm-javac

/**
 * Create a symbol for a class that implements a given functional interface
 * and overrides its functional descriptor. This routine is used for two
 * main purposes: (i) checking well-formedness of a functional interface;
 * (ii) perform functional interface bridge calculation.
 */
public ClassSymbol makeFunctionalInterfaceClass(Env<AttrContext> env, Name name, List<Type> targets, long cflags) {
  if (targets.isEmpty()) {
    return null;
  }
  Symbol descSym = findDescriptorSymbol(targets.head.tsym);
  Type descType = findDescriptorType(targets.head);
  ClassSymbol csym = new ClassSymbol(cflags, name, env.enclClass.sym.outermostClass());
  csym.completer = null;
  csym.members_field = new Scope(csym);
  MethodSymbol instDescSym = new MethodSymbol(descSym.flags(), descSym.name, descType, csym);
  csym.members_field.enter(instDescSym);
  Type.ClassType ctype = new Type.ClassType(Type.noType, List.<Type>nil(), csym);
  ctype.supertype_field = syms.objectType;
  ctype.interfaces_field = targets;
  csym.type = ctype;
  csym.sourcefile = ((ClassSymbol)csym.owner).sourcefile;
  return csym;
}

代码示例来源：origin: org.kohsuke.sorcerer/sorcerer-javac

/**
 * Create a symbol for a class that implements a given functional interface
 * and overrides its functional descriptor. This routine is used for two
 * main purposes: (i) checking well-formedness of a functional interface;
 * (ii) perform functional interface bridge calculation.
 */
public ClassSymbol makeFunctionalInterfaceClass(Env<AttrContext> env, Name name, List<Type> targets, long cflags) {
  if (targets.isEmpty() || !isFunctionalInterface(targets.head)) {
    return null;
  }
  Symbol descSym = findDescriptorSymbol(targets.head.tsym);
  Type descType = findDescriptorType(targets.head);
  ClassSymbol csym = new ClassSymbol(cflags, name, env.enclClass.sym.outermostClass());
  csym.completer = null;
  csym.members_field = new Scope(csym);
  MethodSymbol instDescSym = new MethodSymbol(descSym.flags(), descSym.name, descType, csym);
  csym.members_field.enter(instDescSym);
  Type.ClassType ctype = new Type.ClassType(Type.noType, List.<Type>nil(), csym);
  ctype.supertype_field = syms.objectType;
  ctype.interfaces_field = targets;
  csym.type = ctype;
  csym.sourcefile = ((ClassSymbol)csym.owner).sourcefile;
  return csym;
}

代码示例来源：origin: konsoletyper/teavm-javac

/**
 * Find the minimal set of methods that are overridden by the functional
 * descriptor in 'origin'. All returned methods are assumed to have different
 * erased signatures.
 */
public List<Symbol> functionalInterfaceBridges(TypeSymbol origin) {
  Assert.check(isFunctionalInterface(origin));
  Symbol descSym = findDescriptorSymbol(origin);
  CompoundScope members = membersClosure(origin.type, false);
  ListBuffer<Symbol> overridden = new ListBuffer<>();
  outer: for (Symbol m2 : members.getElementsByName(descSym.name, bridgeFilter)) {
    if (m2 == descSym) continue;
    else if (descSym.overrides(m2, origin, Types.this, false)) {
      for (Symbol m3 : overridden) {
        if (isSameType(m3.erasure(Types.this), m2.erasure(Types.this)) ||
            (m3.overrides(m2, origin, Types.this, false) &&
            (pendingBridges((ClassSymbol)origin, m3.enclClass()) ||
            (((MethodSymbol)m2).binaryImplementation((ClassSymbol)m3.owner, Types.this) != null)))) {
          continue outer;
        }
      }
      overridden.add(m2);
    }
  }
  return overridden.toList();
}
//where

代码示例来源：origin: org.kohsuke.sorcerer/sorcerer-javac

/**
 * Find the minimal set of methods that are overridden by the functional
 * descriptor in 'origin'. All returned methods are assumed to have different
 * erased signatures.
 */
public List<Symbol> functionalInterfaceBridges(TypeSymbol origin) {
  Assert.check(isFunctionalInterface(origin));
  Symbol descSym = findDescriptorSymbol(origin);
  CompoundScope members = membersClosure(origin.type, false);
  ListBuffer<Symbol> overridden = new ListBuffer<>();
  outer: for (Symbol m2 : members.getElementsByName(descSym.name, bridgeFilter)) {
    if (m2 == descSym) continue;
    else if (descSym.overrides(m2, origin, Types.this, false)) {
      for (Symbol m3 : overridden) {
        if (isSameType(m3.erasure(Types.this), m2.erasure(Types.this)) ||
            (m3.overrides(m2, origin, Types.this, false) &&
            (pendingBridges((ClassSymbol)origin, m3.enclClass()) ||
            (((MethodSymbol)m2).binaryImplementation((ClassSymbol)m3.owner, Types.this) != null)))) {
          continue outer;
        }
      }
      overridden.add(m2);
    }
  }
  return overridden.toList();
}
//where

代码示例来源：origin: org.kohsuke.sorcerer/sorcerer-javac

JCFunctionalExpression tree = context.tree;
MethodSymbol samSym = (MethodSymbol) types.findDescriptorSymbol(tree.type.tsym);
List<Object> staticArgs = List.<Object>of(
    typeToMethodType(samSym.type),

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