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053d7cf277
The effect of this tiny change is that local variables will be described by llvm.dbg.values, which will get lowered into an accurate location list instead of a stack slot that is valid for the entire scope of the variable. This means the debugger can now accurately track the liveness of variables knowing exactly when they are initialized and when there values go away. Function arguments are still kept in stack slots because (1) they are already initialized at the function entry and (2) LLDB really needs self to be available at all times for the expression evaluator. This was made possible by recent advancements in LLVM such as the live debug variables pass and various related bugfixes. <rdar://problem/15746520>
46 lines
1.9 KiB
Plaintext
46 lines
1.9 KiB
Plaintext
// RUN: %target-swift-frontend %s -emit-ir -module-name test -g -o - | FileCheck %s
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// REQUIRES: CPU=x86_64
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sil_stage canonical
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import Builtin
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import Swift
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import SwiftShims
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// test.foo () -> ()
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sil @_TF4test3fooFT_T_ : $@convention(thin) () -> () {
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bb0:
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%1 = integer_literal $Builtin.Int64, 23
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%2 = struct $Int (%1 : $Builtin.Int64)
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debug_value %2 : $Int, var, name "v"
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// CHECK: call void @llvm.dbg.value(metadata i64 23,
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// function_ref StdlibUnittest._blackHole <A> (A) -> ()
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%5 = function_ref @_TF14StdlibUnittest10_blackHoleurFxT_ : $@convention(thin) <τ_0_0> (@in τ_0_0) -> () // user: %8
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%6 = tuple ()
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%7 = alloc_stack $() // users: %8, %9
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%8 = apply %5<()>(%7) : $@convention(thin) <τ_0_0> (@in τ_0_0) -> ()
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dealloc_stack %7 : $*() // id: %9
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// CHECK: call void @llvm.dbg.value(metadata i64 42,
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%9 = integer_literal $Builtin.Int64, 42 // user: %10
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%10 = struct $Int (%9 : $Builtin.Int64) // user: %11
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debug_value %10 : $Int, var, name "v"
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// function_ref StdlibUnittest._blackHole <A> (A) -> ()
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%13 = function_ref @_TF14StdlibUnittest10_blackHoleurFxT_ : $@convention(thin) <τ_0_0> (@in τ_0_0) -> () // user: %16
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%14 = tuple ()
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%15 = alloc_stack $() // users: %16, %17
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%16 = apply %13<()>(%15) : $@convention(thin) <τ_0_0> (@in τ_0_0) -> ()
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dealloc_stack %15 : $*() // id: %17
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%18 = tuple () // user: %21
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return %18 : $() // id: %21
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// CHECK: {{^}}}
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}
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// Swift.Int.init (_builtinIntegerLiteral : Builtin.Int2048) -> Swift.Int
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sil [transparent] [fragile] @_TFSiCfT22_builtinIntegerLiteralBi2048__Si : $@convention(thin) (Builtin.Int2048, @thin Int.Type) -> Int
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// StdlibUnittest._blackHole <A> (A) -> ()
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sil @_TF14StdlibUnittest10_blackHoleurFxT_ : $@convention(thin) <τ_0_0> (@in τ_0_0) -> ()
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