Revision: 12875
Author: [email protected]
Date: Tue Nov 6 10:14:45 2012
Log: ES6: Adding support for size to Set and Map
Section 15.14.5.10 and 15.16.5.7 in the October 26, 2012 ES6 draft,
http://wiki.ecmascript.org/doku.php?id=harmony:specification_drafts
This adds a getter for "size" to Set.prototype and Map.prototype which
reflects
the number of elements in the Set and Map respectively.
BUG=v8:2395
Review URL: https://codereview.chromium.org/11360089
Patch from Erik Arvidsson <[email protected]>.
http://code.google.com/p/v8/source/detail?r=12875
Modified:
/branches/bleeding_edge/src/collection.js
/branches/bleeding_edge/src/runtime.cc
/branches/bleeding_edge/src/runtime.h
/branches/bleeding_edge/src/v8natives.js
/branches/bleeding_edge/test/mjsunit/harmony/collections.js
=======================================
--- /branches/bleeding_edge/src/collection.js Mon Jun 25 06:33:48 2012
+++ /branches/bleeding_edge/src/collection.js Tue Nov 6 10:14:45 2012
@@ -86,6 +86,15 @@
return false;
}
}
+
+
+function SetGetSize() {
+ if (!IS_SET(this)) {
+ throw MakeTypeError('incompatible_method_receiver',
+ ['Set.prototype.size', this]);
+ }
+ return %SetGetSize(this);
+}
function MapConstructor() {
@@ -143,6 +152,15 @@
}
return %MapDelete(this, key);
}
+
+
+function MapGetSize() {
+ if (!IS_MAP(this)) {
+ throw MakeTypeError('incompatible_method_receiver',
+ ['Map.prototype.size', this]);
+ }
+ return %MapGetSize(this);
+}
function WeakMapConstructor() {
@@ -215,6 +233,7 @@
%SetProperty($Map.prototype, "constructor", $Map, DONT_ENUM);
// Set up the non-enumerable functions on the Set prototype object.
+ InstallGetter($Set.prototype, "size", SetGetSize);
InstallFunctions($Set.prototype, DONT_ENUM, $Array(
"add", SetAdd,
"has", SetHas,
@@ -222,6 +241,7 @@
));
// Set up the non-enumerable functions on the Map prototype object.
+ InstallGetter($Map.prototype, "size", MapGetSize);
InstallFunctions($Map.prototype, DONT_ENUM, $Array(
"get", MapGet,
"set", MapSet,
=======================================
--- /branches/bleeding_edge/src/runtime.cc Tue Nov 6 08:47:15 2012
+++ /branches/bleeding_edge/src/runtime.cc Tue Nov 6 10:14:45 2012
@@ -781,6 +781,15 @@
holder->set_table(*table);
return isolate->heap()->undefined_value();
}
+
+
+RUNTIME_FUNCTION(MaybeObject*, Runtime_SetGetSize) {
+ HandleScope scope(isolate);
+ ASSERT(args.length() == 1);
+ CONVERT_ARG_HANDLE_CHECKED(JSSet, holder, 0);
+ Handle<ObjectHashSet> table(ObjectHashSet::cast(holder->table()));
+ return Smi::FromInt(table->NumberOfElements());
+}
RUNTIME_FUNCTION(MaybeObject*, Runtime_MapInitialize) {
@@ -840,6 +849,15 @@
holder->set_table(*new_table);
return isolate->heap()->undefined_value();
}
+
+
+RUNTIME_FUNCTION(MaybeObject*, Runtime_MapGetSize) {
+ HandleScope scope(isolate);
+ ASSERT(args.length() == 1);
+ CONVERT_ARG_HANDLE_CHECKED(JSMap, holder, 0);
+ Handle<ObjectHashTable> table(ObjectHashTable::cast(holder->table()));
+ return Smi::FromInt(table->NumberOfElements());
+}
RUNTIME_FUNCTION(MaybeObject*, Runtime_WeakMapInitialize) {
=======================================
--- /branches/bleeding_edge/src/runtime.h Tue Nov 6 08:47:15 2012
+++ /branches/bleeding_edge/src/runtime.h Tue Nov 6 10:14:45 2012
@@ -302,6 +302,7 @@
F(SetAdd, 2, 1) \
F(SetHas, 2, 1) \
F(SetDelete, 2, 1) \
+ F(SetGetSize, 1, 1) \
\
/* Harmony maps */ \
F(MapInitialize, 1, 1) \
@@ -309,6 +310,7 @@
F(MapHas, 2, 1) \
F(MapDelete, 2, 1) \
F(MapSet, 3, 1) \
+ F(MapGetSize, 1, 1) \
\
/* Harmony weakmaps */ \
F(WeakMapInitialize, 1, 1) \
=======================================
--- /branches/bleeding_edge/src/v8natives.js Tue Nov 6 04:32:36 2012
+++ /branches/bleeding_edge/src/v8natives.js Tue Nov 6 10:14:45 2012
@@ -59,6 +59,16 @@
}
%ToFastProperties(object);
}
+
+
+// Helper function to install a getter only property.
+function InstallGetter(object, name, getter) {
+ %FunctionSetName(getter, name);
+ %FunctionRemovePrototype(getter);
+ %DefineOrRedefineAccessorProperty(object, name, getter, null, DONT_ENUM);
+ %SetNativeFlag(getter);
+}
+
// Prevents changes to the prototype of a built-in function.
// The "prototype" property of the function object is made
non-configurable,
=======================================
--- /branches/bleeding_edge/test/mjsunit/harmony/collections.js Mon Jun 25
06:33:48 2012
+++ /branches/bleeding_edge/test/mjsunit/harmony/collections.js Tue Nov 6
10:14:45 2012
@@ -314,3 +314,44 @@
// There is a proposed stress-test available at the es-discuss mailing list
// which cannot be reasonably automated. Check it out by hand if you like:
// https://mail.mozilla.org/pipermail/es-discuss/2011-May/014096.html
+
+
+// Set and Map size getters
+var setSizeDescriptor =
Object.getOwnPropertyDescriptor(Set.prototype, 'size');
+assertEquals(undefined, setSizeDescriptor.value);
+assertEquals(undefined, setSizeDescriptor.set);
+assertTrue(setSizeDescriptor.get instanceof Function);
+assertEquals(undefined, setSizeDescriptor.get.prototype);
+assertFalse(setSizeDescriptor.enumerable);
+assertTrue(setSizeDescriptor.configurable);
+
+var s = new Set();
+assertFalse(s.hasOwnProperty('size'));
+for (var i = 0; i < 10; i++) {
+ assertEquals(i, s.size);
+ s.add(i);
+}
+for (var i = 9; i >= 0; i--) {
+ s.delete(i);
+ assertEquals(i, s.size);
+}
+
+
+var mapSizeDescriptor =
Object.getOwnPropertyDescriptor(Map.prototype, 'size');
+assertEquals(undefined, mapSizeDescriptor.value);
+assertEquals(undefined, mapSizeDescriptor.set);
+assertTrue(mapSizeDescriptor.get instanceof Function);
+assertEquals(undefined, mapSizeDescriptor.get.prototype);
+assertFalse(mapSizeDescriptor.enumerable);
+assertTrue(mapSizeDescriptor.configurable);
+
+var m = new Map();
+assertFalse(m.hasOwnProperty('size'));
+for (var i = 0; i < 10; i++) {
+ assertEquals(i, m.size);
+ m.set(i, i);
+}
+for (var i = 9; i >= 0; i--) {
+ m.delete(i);
+ assertEquals(i, m.size);
+}
--
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