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String's hashValue function is implemented in terms of Foundation's hash function in a runtime function on darwin platforms. For non-ASCII strings we will call str.decomposedStringWithCanonicalMapping inside this runtime function which will allocate a new NSString and return the result in the current autorelease pool. We implemented this function in a file compiled without ARC. This meant that we would leak said NSString into the current active autorelease pool. This patch moves the implementation to a file compiled with ARC. ARC will insert objc_retainAutoreleasedReturnValue call and on platforms that require it an marker for the hand-off of the autoreleased return value optimization. SR-4889 rdar://32199117
43 lines
840 B
Swift
43 lines
840 B
Swift
// RUN: %empty-directory(%t)
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// RUN: %target-build-swift -O %s -o %t/StringMemoryTest
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// RUN: %target-run %t/StringMemoryTest | %FileCheck %s
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// REQUIRES: optimized_stdlib
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// REQUIRES: executable_test
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// REQUIRES: objc_interop
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import Foundation
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@inline(never)
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func lookup(_ str: String, _ dict: [String: Int]) -> Bool {
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if let _ = dict[str] {
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return true
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}
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return false
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}
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/// Make sure the hash function does not leak.
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let dict = [ "foo" : 1]
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for _ in 0 ..< 10_000_000 {
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if lookup("\u{1F1E7}\u{1F1E7}", dict) {
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print("Found?!")
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}
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}
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// CHECK: Not found
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print("Not found")
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var usage = rusage()
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getrusage(RUSAGE_SELF, &usage)
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// CHECK: success
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// CHECK-NOT: failure
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// We should not need 50MB for this.
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if usage.ru_maxrss > 50 * 1024 * 1024 {
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print("failure - should not need 50MB!")
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} else {
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print("success")
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}
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