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Dan Blackwell
e62d58349f
The swift compiler memsets new allocas to zero. It does this so that LLDB is able to display a friendly 'variable is uninitialized' message rather than garbage. Unfortunately this use of a variable before its lifetime.start disagrees with the memtag-stack tagging pass. This patch attaches a piece of metadata to these memsets, so that the memtag-stack tagging pass can recognize them and work around them appropriately. Paired with: https://github.com/swiftlang/llvm-project/pull/11846. rdar://162206592
28 lines
1016 B
Swift
28 lines
1016 B
Swift
// RUN: %target-swift-frontend %s -c -emit-ir -g -o - | %FileCheck %s
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// RUN: %target-swift-frontend %s -O -c -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 ptr, align
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// CHECK: #dbg_declare(ptr %[[OBJ]],
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// CHECK: void @llvm.memset.{{.*}}(ptr align {{(4|8)}} %[[OBJ]], i8 0,
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// CHECK-SAME: ), !Swift.isSwiftLLDBpreinit
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// OPT-NOT: @llvm.memset
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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
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// CHECK: #dbg_declare(ptr %[[DICT]],
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// CHECK: void @llvm.memset.{{.*}}(ptr align {{(4|8)}} %[[DICT]], i8 0,
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// CHECK-SAME: ), !Swift.isSwiftLLDBpreinit
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// OPT-NOT: @llvm.memset
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// OPT: ret
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}
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