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To avoid the debugger displaying garbage or having expressions crash when inspecting an uninitialized dictionary variable, zero-initialize the first word of the alloca at -Onone. <rdar://problem/36619561>
28 lines
1.1 KiB
Swift
28 lines
1.1 KiB
Swift
// RUN: %target-swift-frontend %s -emit-ir -g -o - | %FileCheck %s
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// RUN: %target-swift-frontend %s -O -emit-ir -g -o - | %FileCheck %s --check-prefix=OPT
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class MyClass {}
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// CHECK-LABEL: define {{.*}} @"$S13uninitialized1fyyF"
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// OPT-LABEL: define {{.*}} @"$S13uninitialized1fyyF"
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public func f() {
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var object: MyClass
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// CHECK: %[[OBJ:.*]] = alloca %[[T1:.*]]*, align
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// CHECK: call void @llvm.dbg.declare(metadata %[[T1]]** %[[OBJ]],
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// CHECK: %[[BC1:.*]] = bitcast %[[T1]]** %[[OBJ]] to %swift.opaque**, !dbg
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// CHECK: store %swift.opaque* null, %swift.opaque** %[[BC1]], align {{.*}}, !dbg
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// OPT-NOT: store
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// OPT: ret
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}
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// CHECK-LABEL: define {{.*}} @"$S13uninitialized1gyyF"
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// OPT-LABEL: define {{.*}} @"$S13uninitialized1gyyF"
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public func g() {
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var dict: Dictionary<Int64, Int64>
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// CHECK: %[[DICT:.*]] = alloca %[[T2:.*]], align
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// CHECK: call void @llvm.dbg.declare(metadata %[[T2]]* %[[DICT]],
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// CHECK: %[[BC2:.*]] = bitcast %[[T2]]* %[[DICT]] to %swift.opaque**, !dbg
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// CHECK: store %swift.opaque* null, %swift.opaque** %[[BC2]], align {{.*}}, !dbg
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// OPT-NOT: store
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// OPT: ret
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}
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