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src/jdk.scripting.nashorn/share/classes/jdk/nashorn/internal/objects/Global.java

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  71 import jdk.nashorn.internal.runtime.ScriptEnvironment;
  72 import jdk.nashorn.internal.runtime.ScriptFunction;
  73 import jdk.nashorn.internal.runtime.ScriptObject;
  74 import jdk.nashorn.internal.runtime.ScriptRuntime;
  75 import jdk.nashorn.internal.runtime.ScriptingFunctions;
  76 import jdk.nashorn.internal.runtime.Specialization;
  77 import jdk.nashorn.internal.runtime.arrays.ArrayData;
  78 import jdk.nashorn.internal.runtime.linker.Bootstrap;
  79 import jdk.nashorn.internal.runtime.linker.InvokeByName;
  80 import jdk.nashorn.internal.runtime.linker.NashornCallSiteDescriptor;
  81 import jdk.nashorn.internal.runtime.regexp.RegExpResult;
  82 import jdk.nashorn.internal.scripts.JD;
  83 import jdk.nashorn.internal.scripts.JO;
  84 import jdk.nashorn.tools.ShellFunctions;
  85 
  86 /**
  87  * Representation of global scope.
  88  */
  89 @ScriptClass("Global")
  90 public final class Global extends Scope {
  91     // Placeholder value used in place of a location property (__FILE__, __DIR__, __LINE__)
  92     private static final Object LOCATION_PROPERTY_PLACEHOLDER = new Object();



  93     private final InvokeByName TO_STRING = new InvokeByName("toString", ScriptObject.class);
  94     private final InvokeByName VALUE_OF  = new InvokeByName("valueOf",  ScriptObject.class);
  95 
  96     // placeholder value for lazily initialized global objects
  97     private static final Object LAZY_SENTINEL = new Object();
  98 
  99     /**
 100      * Optimistic builtin names that require switchpoint invalidation
 101      * upon assignment. Overly conservative, but works for now, to avoid
 102      * any complicated scope checks and especially heavy weight guards
 103      * like
 104      *
 105      * <pre>
 106      *     public boolean setterGuard(final Object receiver) {
 107      *         final Global          global = Global.instance();
 108      *         final ScriptObject    sobj   = global.getFunctionPrototype();
 109      *         final Object          apply  = sobj.get("apply");
 110      *         return apply == receiver;
 111      *     }
 112      * </pre>
 113      *
 114      * Naturally, checking for builtin classes like NativeFunction is cheaper,
 115      * it's when you start adding property checks for said builtins you have
 116      * problems with guard speed.
 117      */
 118 


 165     public Object print;
 166 
 167     /** Nashorn extension: global.load */
 168     @Property(attributes = Attribute.NOT_ENUMERABLE)
 169     public Object load;
 170 
 171     /** Nashorn extension: global.loadWithNewGlobal */
 172     @Property(attributes = Attribute.NOT_ENUMERABLE)
 173     public Object loadWithNewGlobal;
 174 
 175     /** Nashorn extension: global.exit */
 176     @Property(attributes = Attribute.NOT_ENUMERABLE)
 177     public Object exit;
 178 
 179     /** Nashorn extension: global.quit */
 180     @Property(attributes = Attribute.NOT_ENUMERABLE)
 181     public Object quit;
 182 
 183     /** Value property NaN of the Global Object - ECMA 15.1.1.1 NaN */
 184     @Property(attributes = Attribute.NON_ENUMERABLE_CONSTANT)
 185     public final double NaN = Double.NaN;
 186 
 187     /** Value property Infinity of the Global Object - ECMA 15.1.1.2 Infinity */
 188     @Property(attributes = Attribute.NON_ENUMERABLE_CONSTANT)
 189     public final double Infinity = Double.POSITIVE_INFINITY;
 190 
 191     /** Value property Undefined of the Global Object - ECMA 15.1.1.3 Undefined */
 192     @Property(attributes = Attribute.NON_ENUMERABLE_CONSTANT)
 193     public final Object undefined = UNDEFINED;
 194 
 195     /** ECMA 15.1.2.1 eval(x) */
 196     @Property(attributes = Attribute.NOT_ENUMERABLE)
 197     public Object eval;
 198 
 199     /** ECMA 15.1.4.1 Object constructor. */
 200     @Property(name = "Object", attributes = Attribute.NOT_ENUMERABLE)
 201     public volatile Object object;
 202 
 203     /** ECMA 15.1.4.2 Function constructor. */
 204     @Property(name = "Function", attributes = Attribute.NOT_ENUMERABLE)
 205     public volatile Object function;
 206 
 207     /** ECMA 15.1.4.3 Array constructor. */
 208     @Property(name = "Array", attributes = Attribute.NOT_ENUMERABLE)
 209     public volatile Object array;
 210 
 211     /** ECMA 15.1.4.4 String constructor */
 212     @Property(name = "String", attributes = Attribute.NOT_ENUMERABLE)
 213     public volatile Object string;


 813         }
 814         return global.javaApi;
 815     }
 816 
 817     /**
 818      * Setter for the Nashorn extension: global.Java property.
 819      *
 820      * @param self self reference
 821      * @param value value of the Java property
 822      */
 823     @Setter(name = "Java", attributes = Attribute.NOT_ENUMERABLE)
 824     public static void setJavaApi(final Object self, final Object value) {
 825         final Global global = Global.instanceFrom(self);
 826         global.javaApi = value;
 827     }
 828 
 829     private volatile Object javaApi;
 830 
 831     /** Nashorn extension: current script's file name */
 832     @Property(name = "__FILE__", attributes = Attribute.NON_ENUMERABLE_CONSTANT)
 833     public final Object __FILE__ = LOCATION_PROPERTY_PLACEHOLDER;
 834 
 835     /** Nashorn extension: current script's directory */
 836     @Property(name = "__DIR__", attributes = Attribute.NON_ENUMERABLE_CONSTANT)
 837     public final Object __DIR__ = LOCATION_PROPERTY_PLACEHOLDER;
 838 
 839     /** Nashorn extension: current source line number being executed */
 840     @Property(name = "__LINE__", attributes = Attribute.NON_ENUMERABLE_CONSTANT)
 841     public final Object __LINE__ = LOCATION_PROPERTY_PLACEHOLDER;
 842 
 843     private volatile NativeDate DEFAULT_DATE;
 844 
 845     /** Used as Date.prototype's default value */
 846     NativeDate getDefaultDate() {
 847         return DEFAULT_DATE;
 848     }
 849 
 850     private volatile NativeRegExp DEFAULT_REGEXP;
 851 
 852     /** Used as RegExp.prototype's default value */
 853     NativeRegExp getDefaultRegExp() {
 854         return DEFAULT_REGEXP;
 855     }
 856 
 857     /*
 858      * Built-in constructor objects: Even if user changes dynamic values of
 859      * "Object", "Array" etc., we still want to keep original values of these
 860      * constructors here. For example, we need to be able to create array,
 861      * regexp literals even after user overwrites global "Array" or "RegExp"


2003         return fn == Global.instance().builtinEval;
2004     }
2005 
2006     /**
2007      * Called from generated to replace a location property placeholder with the actual location property value.
2008      *
2009      * @param  placeholder the value tested for being a placeholder for a location property
2010      * @param  locationProperty the actual value for the location property
2011      * @return locationProperty if placeholder is indeed a placeholder for a location property, the placeholder otherwise
2012      */
2013     public static Object replaceLocationPropertyPlaceholder(final Object placeholder, final Object locationProperty) {
2014         return isLocationPropertyPlaceholder(placeholder) ? locationProperty : placeholder;
2015     }
2016 
2017     /**
2018      * Called from runtime internals to check if the passed value is a location property placeholder.
2019      * @param  placeholder the value tested for being a placeholder for a location property
2020      * @return true if the value is a placeholder, false otherwise.
2021      */
2022     public static boolean isLocationPropertyPlaceholder(final Object placeholder) {
2023         return placeholder == LOCATION_PROPERTY_PLACEHOLDER;
2024     }
2025 
2026     /**
2027      * Create a new RegExp object.
2028      *
2029      * @param expression Regular expression.
2030      * @param options    Search options.
2031      *
2032      * @return New RegExp object.
2033      */
2034     public static Object newRegExp(final String expression, final String options) {
2035         if (options == null) {
2036             return new NativeRegExp(expression);
2037         }
2038         return new NativeRegExp(expression, options);
2039     }
2040 
2041     /**
2042      * Get the object prototype
2043      *




  71 import jdk.nashorn.internal.runtime.ScriptEnvironment;
  72 import jdk.nashorn.internal.runtime.ScriptFunction;
  73 import jdk.nashorn.internal.runtime.ScriptObject;
  74 import jdk.nashorn.internal.runtime.ScriptRuntime;
  75 import jdk.nashorn.internal.runtime.ScriptingFunctions;
  76 import jdk.nashorn.internal.runtime.Specialization;
  77 import jdk.nashorn.internal.runtime.arrays.ArrayData;
  78 import jdk.nashorn.internal.runtime.linker.Bootstrap;
  79 import jdk.nashorn.internal.runtime.linker.InvokeByName;
  80 import jdk.nashorn.internal.runtime.linker.NashornCallSiteDescriptor;
  81 import jdk.nashorn.internal.runtime.regexp.RegExpResult;
  82 import jdk.nashorn.internal.scripts.JD;
  83 import jdk.nashorn.internal.scripts.JO;
  84 import jdk.nashorn.tools.ShellFunctions;
  85 
  86 /**
  87  * Representation of global scope.
  88  */
  89 @ScriptClass("Global")
  90 public final class Global extends Scope {
  91     // This special value is used to flag a lazily initialized global property.
  92     // This also serves as placeholder value used in place of a location property
  93     // (__FILE__, __DIR__, __LINE__)
  94     private static final Object LAZY_SENTINEL = new Object();
  95 
  96     private final InvokeByName TO_STRING = new InvokeByName("toString", ScriptObject.class);
  97     private final InvokeByName VALUE_OF  = new InvokeByName("valueOf",  ScriptObject.class);
  98 



  99     /**
 100      * Optimistic builtin names that require switchpoint invalidation
 101      * upon assignment. Overly conservative, but works for now, to avoid
 102      * any complicated scope checks and especially heavy weight guards
 103      * like
 104      *
 105      * <pre>
 106      *     public boolean setterGuard(final Object receiver) {
 107      *         final Global          global = Global.instance();
 108      *         final ScriptObject    sobj   = global.getFunctionPrototype();
 109      *         final Object          apply  = sobj.get("apply");
 110      *         return apply == receiver;
 111      *     }
 112      * </pre>
 113      *
 114      * Naturally, checking for builtin classes like NativeFunction is cheaper,
 115      * it's when you start adding property checks for said builtins you have
 116      * problems with guard speed.
 117      */
 118 


 165     public Object print;
 166 
 167     /** Nashorn extension: global.load */
 168     @Property(attributes = Attribute.NOT_ENUMERABLE)
 169     public Object load;
 170 
 171     /** Nashorn extension: global.loadWithNewGlobal */
 172     @Property(attributes = Attribute.NOT_ENUMERABLE)
 173     public Object loadWithNewGlobal;
 174 
 175     /** Nashorn extension: global.exit */
 176     @Property(attributes = Attribute.NOT_ENUMERABLE)
 177     public Object exit;
 178 
 179     /** Nashorn extension: global.quit */
 180     @Property(attributes = Attribute.NOT_ENUMERABLE)
 181     public Object quit;
 182 
 183     /** Value property NaN of the Global Object - ECMA 15.1.1.1 NaN */
 184     @Property(attributes = Attribute.NON_ENUMERABLE_CONSTANT)
 185     public static final double NaN = Double.NaN;
 186 
 187     /** Value property Infinity of the Global Object - ECMA 15.1.1.2 Infinity */
 188     @Property(attributes = Attribute.NON_ENUMERABLE_CONSTANT)
 189     public static final double Infinity = Double.POSITIVE_INFINITY;
 190 
 191     /** Value property Undefined of the Global Object - ECMA 15.1.1.3 Undefined */
 192     @Property(attributes = Attribute.NON_ENUMERABLE_CONSTANT)
 193     public static final Object undefined = UNDEFINED;
 194 
 195     /** ECMA 15.1.2.1 eval(x) */
 196     @Property(attributes = Attribute.NOT_ENUMERABLE)
 197     public Object eval;
 198 
 199     /** ECMA 15.1.4.1 Object constructor. */
 200     @Property(name = "Object", attributes = Attribute.NOT_ENUMERABLE)
 201     public volatile Object object;
 202 
 203     /** ECMA 15.1.4.2 Function constructor. */
 204     @Property(name = "Function", attributes = Attribute.NOT_ENUMERABLE)
 205     public volatile Object function;
 206 
 207     /** ECMA 15.1.4.3 Array constructor. */
 208     @Property(name = "Array", attributes = Attribute.NOT_ENUMERABLE)
 209     public volatile Object array;
 210 
 211     /** ECMA 15.1.4.4 String constructor */
 212     @Property(name = "String", attributes = Attribute.NOT_ENUMERABLE)
 213     public volatile Object string;


 813         }
 814         return global.javaApi;
 815     }
 816 
 817     /**
 818      * Setter for the Nashorn extension: global.Java property.
 819      *
 820      * @param self self reference
 821      * @param value value of the Java property
 822      */
 823     @Setter(name = "Java", attributes = Attribute.NOT_ENUMERABLE)
 824     public static void setJavaApi(final Object self, final Object value) {
 825         final Global global = Global.instanceFrom(self);
 826         global.javaApi = value;
 827     }
 828 
 829     private volatile Object javaApi;
 830 
 831     /** Nashorn extension: current script's file name */
 832     @Property(name = "__FILE__", attributes = Attribute.NON_ENUMERABLE_CONSTANT)
 833     public static final Object __FILE__ = LAZY_SENTINEL;
 834 
 835     /** Nashorn extension: current script's directory */
 836     @Property(name = "__DIR__", attributes = Attribute.NON_ENUMERABLE_CONSTANT)
 837     public static final Object __DIR__ = LAZY_SENTINEL;
 838 
 839     /** Nashorn extension: current source line number being executed */
 840     @Property(name = "__LINE__", attributes = Attribute.NON_ENUMERABLE_CONSTANT)
 841     public static final Object __LINE__ = LAZY_SENTINEL;
 842 
 843     private volatile NativeDate DEFAULT_DATE;
 844 
 845     /** Used as Date.prototype's default value */
 846     NativeDate getDefaultDate() {
 847         return DEFAULT_DATE;
 848     }
 849 
 850     private volatile NativeRegExp DEFAULT_REGEXP;
 851 
 852     /** Used as RegExp.prototype's default value */
 853     NativeRegExp getDefaultRegExp() {
 854         return DEFAULT_REGEXP;
 855     }
 856 
 857     /*
 858      * Built-in constructor objects: Even if user changes dynamic values of
 859      * "Object", "Array" etc., we still want to keep original values of these
 860      * constructors here. For example, we need to be able to create array,
 861      * regexp literals even after user overwrites global "Array" or "RegExp"


2003         return fn == Global.instance().builtinEval;
2004     }
2005 
2006     /**
2007      * Called from generated to replace a location property placeholder with the actual location property value.
2008      *
2009      * @param  placeholder the value tested for being a placeholder for a location property
2010      * @param  locationProperty the actual value for the location property
2011      * @return locationProperty if placeholder is indeed a placeholder for a location property, the placeholder otherwise
2012      */
2013     public static Object replaceLocationPropertyPlaceholder(final Object placeholder, final Object locationProperty) {
2014         return isLocationPropertyPlaceholder(placeholder) ? locationProperty : placeholder;
2015     }
2016 
2017     /**
2018      * Called from runtime internals to check if the passed value is a location property placeholder.
2019      * @param  placeholder the value tested for being a placeholder for a location property
2020      * @return true if the value is a placeholder, false otherwise.
2021      */
2022     public static boolean isLocationPropertyPlaceholder(final Object placeholder) {
2023         return placeholder == LAZY_SENTINEL;
2024     }
2025 
2026     /**
2027      * Create a new RegExp object.
2028      *
2029      * @param expression Regular expression.
2030      * @param options    Search options.
2031      *
2032      * @return New RegExp object.
2033      */
2034     public static Object newRegExp(final String expression, final String options) {
2035         if (options == null) {
2036             return new NativeRegExp(expression);
2037         }
2038         return new NativeRegExp(expression, options);
2039     }
2040 
2041     /**
2042      * Get the object prototype
2043      *


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