import com.google.javascript.jscomp.AnalyzePrototypeProperties.NameInfo; //导入依赖的package包/类
/**
 * Remove all properties under a given name if the property name is
 * never referenced.
 */
private void removeUnusedSymbols(Collection<NameInfo> allNameInfo) {
  boolean changed = false;
  for (NameInfo nameInfo : allNameInfo) {
    if (!nameInfo.isReferenced()) {
      for (Symbol declaration : nameInfo.getDeclarations()) {
        declaration.remove();
        changed = true;
      }

      logger.fine("Removed unused prototype property: " + nameInfo.name);
    }
  }

  if (changed) {
    compiler.reportCodeChange();
  }
}
 

import com.google.javascript.jscomp.AnalyzePrototypeProperties.NameInfo; //导入依赖的package包/类
static boolean hasUnmovableRedeclaration(NameInfo nameInfo, Property prop) {
  for (Symbol symbol : nameInfo.getDeclarations()) {
    if (!(symbol instanceof Property)) {
      continue;
    }
    Property otherProp = (Property) symbol;
    // It is possible to do better here if the dependencies are well defined
    // but redefinitions are usually in optional modules so it isn't likely
    // worth the effort to check.
    if (prop != otherProp
        && prop.getRootVar() == otherProp.getRootVar()
        && prop.getModule() != otherProp.getModule()) {
      return true;
    }
  }
  return false;
}
 

import com.google.javascript.jscomp.AnalyzePrototypeProperties.NameInfo; //导入依赖的package包/类
/**
 * Remove all properties under a given name if the property name is
 * never referenced.
 */
private void removeUnusedSymbols(Collection<NameInfo> allNameInfo) {
  boolean changed = false;
  for (NameInfo nameInfo : allNameInfo) {
    if (!nameInfo.isReferenced()) {
      for (Symbol declaration : nameInfo.getDeclarations()) {
        boolean canRemove = false;

        if (specializationState == null) {
          canRemove = true;
        } else {
          Node specializableFunction =
            getSpecializableFunctionFromSymbol(declaration);

          if (specializableFunction != null) {
            specializationState.reportRemovedFunction(specializableFunction);
            canRemove = true;
          }
        }

        if (canRemove) {
          declaration.remove();
          changed = true;
        }
      }

      logger.fine("Removed unused prototype property: " + nameInfo.name);
    }
  }

  if (changed) {
    compiler.reportCodeChange();
  }
}
 

import com.google.javascript.jscomp.AnalyzePrototypeProperties.NameInfo; //导入依赖的package包/类
/**
 * Remove all properties under a given name if the property name is
 * never referenced.
 */
private void removeUnusedSymbols(Collection<NameInfo> allNameInfo) {
  boolean changed = false;
  for (NameInfo nameInfo : allNameInfo) {
    if (!nameInfo.isReferenced()) {
      for (Symbol declaration : nameInfo.getDeclarations()) {
        boolean canRemove = false;

        if (specializationState == null) {
          canRemove = true;
        } else {
          Node specializableFunction =
            getSpecializableFunctionFromSymbol(declaration);

          if (specializableFunction != null) {
            specializationState.reportRemovedFunction(
                specializableFunction, null);
            canRemove = true;
          }
        }

        if (canRemove) {
          declaration.remove();
          changed = true;
        }
      }

      logger.fine("Removed unused prototype property: " + nameInfo.name);
    }
  }

  if (changed) {
    compiler.reportCodeChange();
  }
}
 

import com.google.javascript.jscomp.AnalyzePrototypeProperties.NameInfo; //导入依赖的package包/类
/**
 * Remove all properties under a given name if the property name is
 * never referenced.
 */
private void removeUnusedSymbols(Collection<NameInfo> allNameInfo) {
  for (NameInfo nameInfo : allNameInfo) {
    if (!nameInfo.isReferenced()) {
      for (Symbol declaration : nameInfo.getDeclarations()) {
        boolean canRemove = false;
        if (specializationState == null) {
          canRemove = true;
        } else {
          Node specializableFunction =
            getSpecializableFunctionFromSymbol(declaration);

          if (specializableFunction != null) {
            specializationState.reportRemovedFunction(
                specializableFunction, null);
            canRemove = true;
          }
        }
        if (canRemove) {
          // Code-change reporting happens at the remove methods
          declaration.remove(compiler);
        }
      }
      logger.fine("Removed unused prototype property: " + nameInfo.name);
    }
  }
}