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ddf5130806
We already zero init AllocStack, and here's the same. The debugger's variable view shows up variables on the line where they're declared (before they've been initialized). In some cases, we just print garbage. In some others, it's dangerous (imagine an array which we believe has 2^32 elements because we ended up reusing a stack slot). This way it's always consistent, as lldb uses the first word to understand whether an object is initialized or not here. Fixes <rdar://problem/39883298>
29 lines
982 B
Swift
29 lines
982 B
Swift
// RUN: %target-swift-frontend %s -emit-ir -g -o - | %FileCheck %s
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func markUsed<T>(_ t: T) {}
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func foo(_ x: inout Int64) {
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// Make sure the shadow copy is being made in the prologue or (at
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// line 0), but the code to load the value from the inout storage is
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// not.
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// CHECK: %[[X:.*]] = alloca %Ts5Int64V*, align {{(4|8)}}
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// CHECK-NEXT: call void @llvm.dbg.declare
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// CHECK-NEXT: [[ZEROED:%[0-9]+]] = bitcast %Ts5Int64V** %[[X]] to %swift.opaque**
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// CHECK-NEXT: store %swift.opaque* null, %swift.opaque** [[ZEROED]], align {{(4|8)}}
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// CHECK: store %Ts5Int64V* %0, %Ts5Int64V** %[[X]], align {{(4|8)}}
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// CHECK-SAME: !dbg ![[LOC0:.*]]
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// CHECK-NEXT: getelementptr inbounds %Ts5Int64V, %Ts5Int64V* %0, i32 0, i32 0,
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// CHECK-SAME: !dbg ![[LOC1:.*]]
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// CHECK: ![[LOC0]] = !DILocation(line: 0,
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// CHECK: ![[LOC1]] = !DILocation(line: [[@LINE+1]],
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x = x + 2
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}
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func main() {
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var x : Int64 = 1
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foo(&x)
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markUsed("break here to see \(x)")
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}
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main()
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