test/SILOptimizer/static_initializer.sil

// RUN: %target-sil-opt -enable-sil-verify-all %s -global-opt | %FileCheck %s

import Builtin
import Swift

struct Inner {
  let x: Int32
}

struct Outer {
  let a: Int32
  let b: Inner
  let c: Int32
}

// Check that token0 gets eliminated as it is not used after removing the once call.
// CHECK-NOT: sil_global private @globalinit_token0 : $Builtin.Word
sil_global private @globalinit_token0 : $Builtin.Word

// CHECK: sil_global @_Tv2ch1xSi : $Outer = {
// CHECK-NEXT:   %0 = integer_literal $Builtin.Int32, 2
// CHECK-NEXT:   %1 = struct $Int32 (%0 : $Builtin.Int32)
// CHECK-NEXT:   %2 = struct $Inner (%1 : $Int32)
// CHECK-NEXT:   %initval = struct $Outer (%1 : $Int32, %2 : $Inner, %1 : $Int32)
// CHECK-NEXT: }
sil_global @_Tv2ch1xSi : $Outer

// CHECK-LABEL: sil private @globalinit_func0 : $@convention(c) () -> () {
sil private @globalinit_func0 : $@convention(c) () -> () {
bb0:
  %0 = global_addr @_Tv2ch1xSi : $*Outer
  %1 = integer_literal $Builtin.Int32, 2
  %2 = struct $Int32 (%1 : $Builtin.Int32)
  %3 = struct $Inner (%2 : $Int32)
  %4 = struct $Outer (%2 : $Int32, %3 : $Inner, %2 : $Int32)
  store %4 to %0 : $*Outer
  %r = tuple ()
  return %r : $()
}

// CHECK-LABEL: sil [global_init] @_TF2cha1xSi : $@convention(thin) () -> Builtin.RawPointer {
// CHECK-NEXT: bb0:
// CHECK-NOT: global_addr @globalinit_token0
// CHECK-NEXT: address_to_pointer
// CHECK: function_ref @globalinit_func0 : $@convention(c) () -> ()
// CHECK-NEXT: global_addr @_Tv2ch1xSi : $*Outer
// CHECK-NEXT: address_to_pointer
// CHECK-NEXT: return
sil [global_init] @_TF2cha1xSi : $@convention(thin) () -> Builtin.RawPointer {
bb0:
  %1 = global_addr @globalinit_token0 : $*Builtin.Word
  %2 = address_to_pointer %1 : $*Builtin.Word to $Builtin.RawPointer
  %3 = function_ref @globalinit_func0 : $@convention(c) () -> ()
  %5 = builtin "once"(%2 : $Builtin.RawPointer, %3 : $@convention(c) () -> ()) : $()
  %6 = global_addr @_Tv2ch1xSi : $*Outer
  %7 = address_to_pointer %6 : $*Outer to $Builtin.RawPointer
  return %7 : $Builtin.RawPointer
}

// CHECK-LABEL: sil @_TF2ch1fFT_Si : $@convention(thin) () -> Outer {
sil @_TF2ch1fFT_Si : $@convention(thin) () -> Outer {
bb0:
  %0 = function_ref @_TF2cha1xSi : $@convention(thin) () -> Builtin.RawPointer
  %1 = apply %0() : $@convention(thin) () -> Builtin.RawPointer
  %2 = pointer_to_address %1 : $Builtin.RawPointer to [strict] $*Outer
  %3 = load %2 : $*Outer
  return %3 : $Outer
}