class_stack_alloc.sil

// RUN: %target-swift-frontend -emit-stack-promotion-checks -stack-promotion-limit 48 -Onone -emit-ir %s | FileCheck %s

import Builtin
import Swift

class TestClass {
  @sil_stored var a : Int64
  init()
}

struct TestStruct {
  @sil_stored var a : Int64
  @sil_stored var b : Int64
  @sil_stored var c : Int64
}

sil_vtable TestClass {}

// CHECK-LABEL: define void @simple_promote
// CHECK: %reference.raw = alloca %[[C:[a-zA-Z0-9_]+]], align 8
// CHECK: [[M:%[0-9]+]] = call %swift.type* @_TMa[[C]]()
// CHECK: [[O:%[0-9]+]] = bitcast %[[C]]* %reference.raw to %swift.refcounted*
// CHECK: %reference.new = call %swift.refcounted* @swift_initStackObject(%swift.type* [[M]], %swift.refcounted* [[O]])
// CHECK: [[R:%[0-9]+]] = bitcast %swift.refcounted* %reference.new to %[[C]]*
// CHECK: call {{.*}} @swift_release {{.*}} [[R]])
// CHECK: [[O2:%[0-9]+]] = bitcast %[[C]]* [[R]] to %swift.refcounted*
// CHECK: call void @swift_verifyEndOfLifetime(%swift.refcounted* [[O2]])
// CHECK: ret void
sil @simple_promote : $@convention(thin) () -> () {
bb0:
  %o1 = alloc_ref [stack] $TestClass
  strong_release %o1 : $TestClass
  dealloc_ref [stack] %o1 : $TestClass

  %r = tuple()
  return %r : $()
}

// A stack promotion limit of 48 bytes allows that one of the two alloc_refs
// can be allocated on the stack.

// CHECK-LABEL: define void @exceed_limit
// CHECK: alloca {{.*}}TestClass
// CHECK: alloca {{.*}}TestStruct
// CHECK-NOT: alloca
// CHECK: call %swift.refcounted* @swift_initStackObject
// CHECK: call noalias %swift.refcounted* @swift_allocObject
// CHECK: ret void
sil @exceed_limit : $@convention(thin) () -> () {
bb0:
  %o1 = alloc_ref [stack] $TestClass
  %o2 = alloc_ref [stack] $TestClass

  %s1 = alloc_stack $TestStruct

  %f = function_ref @unknown_func :  $@convention(thin) (@inout TestStruct) -> ()
  %a = apply %f(%s1#1) : $@convention(thin) (@inout TestStruct) -> ()

  dealloc_stack %s1#0 : $*@local_storage TestStruct

  strong_release %o1 : $TestClass
  strong_release %o2 : $TestClass
  dealloc_ref [stack] %o2 : $TestClass
  dealloc_ref [stack] %o1 : $TestClass

  %r = tuple()
  return %r : $()
}

sil @unknown_func :  $@convention(thin) (@inout TestStruct) -> ()