Fix heap growth in Host.swift

Foundation.xcodeproj/project.pbxproj

@@ -337,6 +337,7 @@
 		BD8042161E09857800487EB8 /* TestLengthFormatter.swift in Sources */ = {isa = PBXBuildFile; fileRef = BD8042151E09857800487EB8 /* TestLengthFormatter.swift */; };
 		BDBB65901E256BFA001A7286 /* TestEnergyFormatter.swift in Sources */ = {isa = PBXBuildFile; fileRef = BDBB658F1E256BFA001A7286 /* TestEnergyFormatter.swift */; };
 		BDFDF0A71DFF5B3E00C04CC5 /* TestPersonNameComponents.swift in Sources */ = {isa = PBXBuildFile; fileRef = BDFDF0A61DFF5B3E00C04CC5 /* TestPersonNameComponents.swift */; };
+		BF85E9D81FBDCC2000A79793 /* TestHost.swift in Sources */ = {isa = PBXBuildFile; fileRef = BF85E9D71FBDCC2000A79793 /* TestHost.swift */; };
 		BF8E65311DC3B3CB005AB5C3 /* TestNotification.swift in Sources */ = {isa = PBXBuildFile; fileRef = BF8E65301DC3B3CB005AB5C3 /* TestNotification.swift */; };
 		CC5249C01D341D23007CB54D /* TestUnitConverter.swift in Sources */ = {isa = PBXBuildFile; fileRef = CC5249BF1D341D23007CB54D /* TestUnitConverter.swift */; };
 		CD1C7F7D1E303B47008E331C /* TestNSError.swift in Sources */ = {isa = PBXBuildFile; fileRef = CD1C7F7C1E303B47008E331C /* TestNSError.swift */; };
@@ -807,6 +808,7 @@
 		BD8042151E09857800487EB8 /* TestLengthFormatter.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = TestLengthFormatter.swift; sourceTree = "<group>"; };
 		BDBB658F1E256BFA001A7286 /* TestEnergyFormatter.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = TestEnergyFormatter.swift; sourceTree = "<group>"; };
 		BDFDF0A61DFF5B3E00C04CC5 /* TestPersonNameComponents.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = TestPersonNameComponents.swift; sourceTree = "<group>"; };
+		BF85E9D71FBDCC2000A79793 /* TestHost.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = TestHost.swift; sourceTree = "<group>"; };
 		BF8E65301DC3B3CB005AB5C3 /* TestNotification.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = TestNotification.swift; sourceTree = "<group>"; };
 		C2A9D75B1C15C08B00993803 /* TestNSUUID.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = TestNSUUID.swift; sourceTree = "<group>"; };
 		C93559281C12C49F009FD6A9 /* TestAffineTransform.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = TestAffineTransform.swift; sourceTree = "<group>"; };
@@ -1498,6 +1500,7 @@
 				EA54A6FA1DB16D53009E0809 /* TestObjCRuntime.swift */,
 				5B6F17941C48631C00935030 /* TestProcess.swift */,
 				400E22641C1A4E58007C5933 /* TestProcessInfo.swift */,
+				BF85E9D71FBDCC2000A79793 /* TestHost.swift */,
 				EA01AAEB1DA839C4008F4E07 /* TestProgress.swift */,
 				5E5835F31C20C9B500C81317 /* TestThread.swift */,
 				B951B5EB1F4E2A2000D8B332 /* TestNSLock.swift */,
@@ -2423,6 +2426,7 @@
 				2EBE67A51C77BF0E006583D5 /* TestDateFormatter.swift in Sources */,
 				5B13B3291C582D4C00651CE2 /* TestCalendar.swift in Sources */,
 				5B13B34F1C582D4C00651CE2 /* TestXMLParser.swift in Sources */,
+				BF85E9D81FBDCC2000A79793 /* TestHost.swift in Sources */,
 				D5C40F331CDA1D460005690C /* TestOperationQueue.swift in Sources */,
 				BDBB65901E256BFA001A7286 /* TestEnergyFormatter.swift in Sources */,
 				5B13B32F1C582D4C00651CE2 /* TestNSGeometry.swift in Sources */,

Foundation/Host.swift

@@ -95,6 +95,7 @@ open class Host: NSObject {
             }
             ifa = ifaValue.ifa_next
         }
+        _resolved = true
 #endif
     }
 
@@ -158,6 +159,7 @@ open class Host: NSObject {
                 lookupInfo(&_names, NI_NOFQDN|NI_NAMEREQD)
                 res = info.ai_next
             }
+            _resolved = true
         }
 #endif   
     }

TestFoundation/TestHost.swift

@@ -0,0 +1,46 @@
+// This source file is part of the Swift.org open source project
+//
+// Copyright (c) 2014 - 2016 Apple Inc. and the Swift project authors
+// Licensed under Apache License v2.0 with Runtime Library Exception
+//
+// See http://swift.org/LICENSE.txt for license information
+// See http://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+//
+
+
+#if DEPLOYMENT_RUNTIME_OBJC || os(Linux)
+    import Foundation
+    import XCTest
+#else
+    import SwiftFoundation
+    import SwiftXCTest
+#endif
+
+
+class TestHost: XCTestCase {
+
+    static var allTests: [(String, (TestHost) -> () throws -> Void)] {
+        return [
+            ("test_addressesDoNotGrow", test_addressesDoNotGrow),
+        ]
+    }
+
+    // SR-6391
+    func test_addressesDoNotGrow() {
+        let local = Host.current()
+        let localAddressesFirst = local.addresses
+        let localAddressesSecond = local.addresses
+        XCTAssertEqual(localAddressesSecond.count, localAddressesFirst.count)
+
+        let dns = Host(address: "8.8.8.8")
+        let dnsAddressesFirst = dns.addresses
+        let dnsAddressesSecond = dns.addresses
+        XCTAssertEqual(dnsAddressesSecond.count, dnsAddressesFirst.count)
+
+        let swift = Host(name: "swift.org")
+        let swiftAddressesFirst = swift.addresses
+        let swiftAddressesSecond = swift.addresses
+        XCTAssertEqual(swiftAddressesSecond.count, swiftAddressesFirst.count)
+    }
+}
+

TestFoundation/main.swift

@@ -71,6 +71,7 @@ XCTMain([
     testCase(TestPipe.allTests),
     testCase(TestNSPredicate.allTests),
     testCase(TestProcessInfo.allTests),
+    testCase(TestHost.allTests),
     testCase(TestPropertyListSerialization.allTests),
     testCase(TestNSRange.allTests),
     testCase(TestNSRegularExpression.allTests),