access_enforcement_selection.sil

// RUN: %target-sil-opt -sil-print-types -access-enforcement-selection -enforce-exclusivity=checked %s | %FileCheck %s

import Builtin
import Swift

sil_stage raw

// Test undef begin_access operands.
// CHECK-LABEL: sil hidden [ossa] @undefStack : $@convention(thin) (Builtin.Int64) -> Builtin.Int64 {
// CHECK: bb0(%0 : $Builtin.Int64):
// CHECK: bb1:
// CHECK: [[WRITE:%.*]] = begin_access [modify] [static] undef : $*Builtin.Int64
// CHECK: store %{{.*}} to [trivial] [[WRITE]] : $*Builtin.Int64
// CHECK: end_access [[WRITE]] : $*Builtin.Int64
// CHECK: br
// CHECK: bb2:
// CHECK: [[READ:%.*]] = begin_access [read] [static] undef : $*Builtin.Int64
// CHECK: %{{.*}} = load [trivial] [[READ]] : $*Builtin.Int64
// CHECK: end_access [[READ]] : $*Builtin.Int64
// CHECK-LABEL: } // end sil function 'undefStack'
sil hidden [ossa] @undefStack : $@convention(thin) (Builtin.Int64) -> Builtin.Int64 {
bb0(%0 : $Builtin.Int64):
  br bb1

bb1:
  %23 = integer_literal $Builtin.Int64, 42
  %25 = begin_access [modify] [unknown] undef : $*Builtin.Int64
  store %23 to [trivial] %25 : $*Builtin.Int64
  end_access %25 : $*Builtin.Int64
  br bb2

bb2:
  %29 = begin_access [read] [unknown] undef : $*Builtin.Int64
  %30 = load [trivial] %29 : $*Builtin.Int64
  end_access %29 : $*Builtin.Int64
  return %30 : $Builtin.Int64
}

// Test static enforcement selection in the presence of mark_function_escape.
// This really isn't really a special case, but depends on pass pipeline.
//
// CHECK-LABEL: sil hidden [ossa] @markFuncEscape : $@convention(thin) () -> () {
// CHECK: bb0:
// CHECK:  [[BOX:%.*]] = alloc_box ${ var Builtin.Int64 }, var, name "x"
// CHECK:  [[ADR:%.*]] = project_box [[BOX]] : ${ var Builtin.Int64 }, 0
// CHECK:  mark_function_escape [[ADR]] : $*Builtin.Int64
// CHECK:  [[READ:%.*]] = begin_access [read] [static] [[ADR]] : $*Builtin.Int64
// CHECK:  %{{.*}} = load [trivial] [[READ]] : $*Builtin.Int64
// CHECK:  end_access [[READ]] : $*Builtin.Int64
// CHECK:  destroy_value [[BOX]] : ${ var Builtin.Int64 }
// CHECK:  return %{{.*}} : $()
// CHECK-LABEL:} // end sil function 'markFuncEscape'
sil hidden [ossa] @markFuncEscape : $@convention(thin) () -> () {
  %2 = alloc_box ${ var Builtin.Int64 }, var, name "x"
  %3 = project_box %2 : ${ var Builtin.Int64 }, 0
  mark_function_escape %3 : $*Builtin.Int64
  %39 = begin_access [read] [unknown] %3 : $*Builtin.Int64
  %40 = load [trivial] %39 : $*Builtin.Int64
  end_access %39 : $*Builtin.Int64
  destroy_value %2 : ${ var Builtin.Int64 }
  %98 = tuple ()
  return %98 : $()
}


sil [ossa] @takesInoutAndClosure : $@convention(thin) (@inout Builtin.Int64, @guaranteed @callee_guaranteed () -> ()) -> ()
sil [ossa] @closureCapturingByStorageAddress : $@convention(thin) (@inout_aliasable Builtin.Int64) -> ()

// Test static enforcement of box addresses that escape via closure
// partial_applys.
// application.
// CHECK-LABEL: sil hidden [ossa] @escapeAsArgumentToPartialApply : $@convention(thin) () -> () {
// CHECK: bb0:
// CHECK:  [[BOX:%.*]] = alloc_box ${ var Builtin.Int64 }, var, name "x"
// CHECK:  [[ADR:%.*]] = project_box [[BOX]] : ${ var Builtin.Int64 }, 0
// CHECK:  [[FUNC:%.*]] = function_ref @takesInoutAndClosure : $@convention(thin) (@inout Builtin.Int64, @guaranteed @callee_guaranteed () -> ()) -> ()
// CHECK:  [[CLOSURE:%.*]] = function_ref @closureCapturingByStorageAddress : $@convention(thin) (@inout_aliasable Builtin.Int64) -> ()
// CHECK:  [[PA:%.*]] = partial_apply [callee_guaranteed] [[CLOSURE]]([[ADR]]) : $@convention(thin) (@inout_aliasable Builtin.Int64) -> ()
// CHECK:  [[MODIFY:%.*]] = begin_access [modify] [static] [[ADR]] : $*Builtin.Int64
// CHECK:  %{{.*}} = apply [[FUNC]]([[MODIFY]], [[PA]]) : $@convention(thin) (@inout Builtin.Int64, @guaranteed @callee_guaranteed () -> ()) -> ()
// CHECK:  end_access [[MODIFY]] : $*Builtin.Int64
// CHECK:  destroy_value [[PA]]
// CHECK:  destroy_value [[BOX]] : ${ var Builtin.Int64 }
// CHECK:  return %{{.*}} : $()
// CHECK-LABEL:} // end sil function 'escapeAsArgumentToPartialApply'
sil hidden [ossa] @escapeAsArgumentToPartialApply : $@convention(thin) () -> () {
bb0:
  %2 = alloc_box ${ var Builtin.Int64 }, var, name "x"
  %3 = project_box %2 : ${ var Builtin.Int64 }, 0
  %4 = function_ref @takesInoutAndClosure : $@convention(thin) (@inout Builtin.Int64, @guaranteed @callee_guaranteed () -> ()) -> ()
  %5 = function_ref @closureCapturingByStorageAddress : $@convention(thin) (@inout_aliasable Builtin.Int64) -> ()
  %6 = partial_apply [callee_guaranteed] %5(%3) : $@convention(thin) (@inout_aliasable Builtin.Int64) -> ()
  %7 = begin_access [modify] [unknown] %3 : $*Builtin.Int64
  %8 = apply %4(%7, %6) : $@convention(thin) (@inout Builtin.Int64, @guaranteed @callee_guaranteed () -> ()) -> ()
  end_access %7 : $*Builtin.Int64
  destroy_value %6 : $@callee_guaranteed () -> ()
  destroy_value %2 : ${ var Builtin.Int64 }
  %9 = tuple ()
  return %9 : $()
}

sil [dynamically_replacable] [ossa] @closureCapturingByStorageAddress2 : $@convention(thin) (@inout_aliasable Builtin.Int64) -> ()

// Make sure that we handle dynamic_function_ref.
sil hidden [ossa] @escapeAsArgumentToPartialApplyDynamic : $@convention(thin) () -> () {
bb0:
  %2 = alloc_box ${ var Builtin.Int64 }, var, name "x"
  %3 = project_box %2 : ${ var Builtin.Int64 }, 0
  %4 = function_ref @takesInoutAndClosure : $@convention(thin) (@inout Builtin.Int64, @guaranteed @callee_guaranteed () -> ()) -> ()
  %5 = dynamic_function_ref @closureCapturingByStorageAddress2 : $@convention(thin) (@inout_aliasable Builtin.Int64) -> ()
  %6 = partial_apply [callee_guaranteed] %5(%3) : $@convention(thin) (@inout_aliasable Builtin.Int64) -> ()
  %7 = begin_access [modify] [unknown] %3 : $*Builtin.Int64
  %8 = apply %4(%7, %6) : $@convention(thin) (@inout Builtin.Int64, @guaranteed @callee_guaranteed () -> ()) -> ()
  end_access %7 : $*Builtin.Int64
  destroy_value %6 : $@callee_guaranteed () -> ()
  destroy_value %2 : ${ var Builtin.Int64 }
  %9 = tuple ()
  return %9 : $()
}
// Test static enforcement of copied boxes.
// FIXME: Oops... We make this dynamic.
//
// CHECK-LABEL: sil hidden [ossa] @copyBox : $@convention(thin) () -> () {
// CHECK: bb0:
// CHECK:  [[BOX:%.*]] = alloc_box ${ var Builtin.Int64 }, var, name "x"
// CHECK:  [[ADR1:%.*]] = project_box [[BOX]] : ${ var Builtin.Int64 }, 0
// CHECK:  [[CPY:%.*]] = copy_value [[BOX]] : ${ var Builtin.Int64 }
// CHECK:  [[ADR2:%.*]] = project_box [[CPY]] : ${ var Builtin.Int64 }, 0
// CHECK:  [[READ:%.*]] = begin_access [read] [dynamic] [[ADR2]] : $*Builtin.Int64
// CHECK:  %{{.*}} = load [trivial] [[READ]] : $*Builtin.Int64
// CHECK:  end_access [[READ]] : $*Builtin.Int64
// CHECK:  [[READ:%.*]] = begin_access [read] [dynamic] [[ADR1]] : $*Builtin.Int64
// CHECK:  %{{.*}} = load [trivial] [[READ]] : $*Builtin.Int64
// CHECK:  end_access [[READ]] : $*Builtin.Int64
// CHECK:  destroy_value [[CPY]] : ${ var Builtin.Int64 }
// CHECK:  destroy_value [[BOX]] : ${ var Builtin.Int64 }
// CHECK:  return %{{.*}} : $()
// CHECK-LABEL: } // end sil function 'copyBox'
sil hidden [ossa] @copyBox : $@convention(thin) () -> () {
  %2 = alloc_box ${ var Builtin.Int64 }, var, name "x"
  %3 = project_box %2 : ${ var Builtin.Int64 }, 0
  %16 = copy_value %2 : ${ var Builtin.Int64 }
  %17 = project_box %16 : ${ var Builtin.Int64 }, 0
  %18 = begin_access [read] [unknown] %17 : $*Builtin.Int64
  %19 = load [trivial] %18 : $*Builtin.Int64
  end_access %18 : $*Builtin.Int64
  %39 = begin_access [read] [unknown] %3 : $*Builtin.Int64
  %40 = load [trivial] %39 : $*Builtin.Int64
  end_access %39 : $*Builtin.Int64
  destroy_value %16 : ${ var Builtin.Int64 }
  destroy_value %2 : ${ var Builtin.Int64 }
  %98 = tuple ()
  return %98 : $()
}

sil [ossa] @closure : $@convention(thin) (@owned { var Builtin.Int64 }) -> () {
bb0(%0 : @owned ${ var Builtin.Int64 }):
  destroy_value %0 : ${ var Builtin.Int64 }
  %empty = tuple ()
  return %empty : $()
}

// An access that escapes on an unreachable path must be dynamic.
//
// CHECK-LABEL: sil [ossa] @partialUnreachable : $@convention(thin) () -> () {
// CHECK: %[[ACCESS:.*]] = begin_access [modify] [dynamic] %{{.*}} : $*Builtin.Int64
// CHECK: bb1:
// CHECK: end_access %[[ACCESS]] : $*Builtin.Int64
// CHECK: return
// CHECK: bb2:
// CHECK: partial_apply
// CHECK: unreachable
sil [ossa] @partialUnreachable : $@convention(thin) () -> () {
bb0:
  %box = alloc_box ${ var Builtin.Int64 }, var, name "x"
  %addr = project_box %box : ${ var Builtin.Int64 }, 0
  %write = begin_access [modify] [unknown] %addr : $*Builtin.Int64
  cond_br undef, bb1, bb2

bb1:
  end_access %write : $*Builtin.Int64
  destroy_value %box : ${ var Builtin.Int64 }
  %empty = tuple ()
  return %empty : $()

bb2:
  %f = function_ref @closure : $@convention(thin) (@owned { var Builtin.Int64 }) -> ()
  %closure = partial_apply %f(%box) : $@convention(thin) (@owned { var Builtin.Int64 }) -> ()
  unreachable
}

// An access that refers to mark_uninitialized.
//
// CHECK-LABEL: sil [ossa] @markUninitSource : $@convention(thin) () -> () {
sil [ossa] @markUninitSource : $@convention(thin) () -> () {
bb0:
  %stk = alloc_stack $Builtin.Int64, let, name "x"
  %var = mark_uninitialized [var] %stk : $*Builtin.Int64
  %f = function_ref @closureCapturingByStorageAddress : $@convention(thin) (@inout_aliasable Builtin.Int64) -> ()
  %closure = partial_apply %f(%var) : $@convention(thin) (@inout_aliasable Builtin.Int64) -> ()
  unreachable
}

// Borrowed closure can be statically checked.
//
// CHECK-LABEL: sil [ossa] @borrowedClosure : $@convention(thin) (@inout_aliasable Builtin.Int64) -> () {
// CHECK: begin_access [read] [static]
// CHECK-LABEL: } // end sil function 'borrowedClosure'
sil [ossa] @borrowedClosure : $@convention(thin) (@inout_aliasable Builtin.Int64) -> () {
bb0(%0 : $*Builtin.Int64):
  %access = begin_access [read] [unknown] %0 : $*Builtin.Int64
  %val = load [trivial] %access : $*Builtin.Int64
  end_access %access : $*Builtin.Int64
  %empty = tuple ()
  return %empty : $()
}

// Borrow an escaping closure. The closure body will be dynamically checked.
sil [ossa] @borrowClosure : $@convention(thin) () -> () {
  %box = alloc_box ${ var Builtin.Int64 }, var, name "x"
  %addr = project_box %box : ${ var Builtin.Int64 }, 0
  // box escapes.
  %copy = copy_value %box : ${ var Builtin.Int64 }

  %f = function_ref @borrowedClosure : $@convention(thin) (@inout_aliasable Builtin.Int64) -> ()
  %closure = partial_apply [callee_guaranteed] %f(%addr) : $@convention(thin) (@inout_aliasable Builtin.Int64) -> ()

  // closure is borrowed.
  %borrow = begin_borrow %closure : $@callee_guaranteed () -> ()
  %closure_copy = copy_value %borrow : $@callee_guaranteed () -> ()
  end_borrow %borrow : $@callee_guaranteed () -> ()

  destroy_value %closure_copy : $@callee_guaranteed () -> ()
  destroy_value %closure : $@callee_guaranteed () -> ()
  destroy_value %copy : ${ var Builtin.Int64 }
  destroy_value %box : ${ var Builtin.Int64 }
  %empty = tuple ()
  return %empty : $()
}

sil [ossa] @dontAssert : $@convention(thin) (Builtin.Int64) -> (@out Builtin.Int64) {
bb0(%0 : $*Builtin.Int64, %1 : $Builtin.Int64):
  store %1 to [trivial] %0 : $*Builtin.Int64
  %f = function_ref @closureCapturingByStorageAddress : $@convention(thin) (@inout_aliasable Builtin.Int64) -> ()
  %closure = partial_apply %f(%0) : $@convention(thin) (@inout_aliasable Builtin.Int64) -> ()
  unreachable
}

sil [canonical] [ossa] @serializedClosureCapturingByStorageAddress : $@convention(thin) (@inout_aliasable Builtin.Int64) -> () {
bb0(%0 : $*Builtin.Int64):
  %2 = begin_access [read] [unknown] %0 : $*Builtin.Int64
  %3 = load [trivial] %2 : $*Builtin.Int64
  end_access %2 : $*Builtin.Int64
  %10 = tuple ()
  return %10 : $()
}

// A begin_access may not be used by a partial_apply or a nested
// begin_access prior to mandatory inlining. Nonetheless, this does
// occur in deserialized SIL. This SIL is only well-formed because the
// function is marked [canonical].
sil [canonical] [ossa] @accessAroundClosure : $@convention(thin) () -> () {
bb0:
  %1 = alloc_box ${ var Builtin.Int64 }, var, name "x"
  %2 = copy_value %1 : ${ var Builtin.Int64 }
  %3 = project_box %1 : ${ var Builtin.Int64 }, 0
  // outer access (presumably its uses were mandatory inlined)
  %4 = begin_access [modify] [static] %3 : $*Builtin.Int64
  %5 = function_ref @serializedClosureCapturingByStorageAddress : $@convention(thin) (@inout_aliasable Builtin.Int64) -> ()
  %6 = partial_apply [callee_guaranteed] %5(%4) : $@convention(thin) (@inout_aliasable Builtin.Int64) -> ()
  %7 = begin_access [modify] [static] %4 : $*Builtin.Int64
  %8 = function_ref @takesInoutAndClosure : $@convention(thin) (@inout Builtin.Int64, @guaranteed @callee_guaranteed () -> ()) -> ()
  %9 = apply %8(%7, %6) : $@convention(thin) (@inout Builtin.Int64, @guaranteed @callee_guaranteed () -> ()) -> ()
  end_access %7 : $*Builtin.Int64
  end_access %4 : $*Builtin.Int64
  destroy_value %6 : $@callee_guaranteed () -> ()
  destroy_value %2 : ${ var Builtin.Int64 }
  destroy_value %1 : ${ var Builtin.Int64 }
  %10 = tuple ()
  return %10 : $()
}

// -----------------------------------------------------------------------------
// <rdar://problem/43122715> [Exclusivity] failure to diagnose escaping closures
// called within directly applied noescape closures.
//
// The top level function, testDirectApplyNoescapeDynamic, has no
// access markers, but it does define a box that escapes into two
// closures. Since one of those captures is a box, they both need
// dynamic enforcement. The unique thing about this case is that the
// non-escaping closure is directly applied, so has no partial_apply
// to indicate the presence of a captured argument.

sil [noinline] @takeInoutAndPerform : $@convention(thin) (@inout Builtin.Int64, @guaranteed @callee_guaranteed () -> ()) -> ()

// CHECK-LABEL: sil [ossa] @testDirectApplyNoescapeDynamic : $@convention(thin) (Builtin.Int64) -> () {
// CHECK-LABEL:  // end sil function 'testDirectApplyNoescapeDynamic'
sil [ossa] @testDirectApplyNoescapeDynamic : $@convention(thin) (Builtin.Int64) -> () {
bb0(%0 : $Builtin.Int64):
  %box = alloc_box ${ var Builtin.Int64 }, var, name "localVal"
  %boxproj = project_box %box : ${ var Builtin.Int64 }, 0

  store %0 to [trivial] %boxproj : $*Builtin.Int64

  %closureF = function_ref @directApplyNoescapeDynamicClosure : $@convention(thin) (@guaranteed { var Builtin.Int64 }) -> ()
  %boxCopy = copy_value %box : ${ var Builtin.Int64 }
  %closure = partial_apply [callee_guaranteed] %closureF(%boxCopy) : $@convention(thin) (@guaranteed { var Builtin.Int64 }) -> ()

  %directF = function_ref @directApplyNoescapeDynamicAppliedClosure : $@convention(thin) (@guaranteed @callee_guaranteed () -> (), @inout_aliasable Builtin.Int64) -> ()
  %call = apply %directF(%closure, %boxproj) : $@convention(thin) (@guaranteed @callee_guaranteed () -> (), @inout_aliasable Builtin.Int64) -> ()
  destroy_value %closure : $@callee_guaranteed () -> ()
  destroy_value %box : ${ var Builtin.Int64 }
  %v = tuple ()
  return %v : $()
}

// CHECK-LABEL: sil private [ossa] @directApplyNoescapeDynamicClosure : $@convention(thin) (@guaranteed { var Builtin.Int64 }) -> () {
// CHECK: [[BOX:%.*]] = project_box %0 : ${ var Builtin.Int64 }, 0
// CHECK: begin_access [modify] [dynamic] [[BOX]] : $*Builtin.Int64
// CHECK-LABEL:  // end sil function 'directApplyNoescapeDynamicClosure'
sil private [ossa] @directApplyNoescapeDynamicClosure : $@convention(thin) (@guaranteed { var Builtin.Int64 }) -> () {
bb0(%0 : @guaranteed ${ var Builtin.Int64 }):
  %1 = project_box %0 : ${ var Builtin.Int64 }, 0
  %4 = integer_literal $Builtin.Int64, 3

  %7 = begin_access [modify] [unknown] %1 : $*Builtin.Int64
  assign %4 to %7 : $*Builtin.Int64
  end_access %7 : $*Builtin.Int64
  %10 = tuple ()
  return %10 : $()
}

// CHECK-LABEL: sil private [ossa] @directApplyNoescapeDynamicAppliedClosure : $@convention(thin) (@guaranteed @callee_guaranteed () -> (), @inout_aliasable Builtin.Int64) -> () {
// CHECK: begin_access [modify] [dynamic] %1 : $*Builtin.Int64
// CHECK-LABEL: end sil function 'directApplyNoescapeDynamicAppliedClosure'
sil private [ossa] @directApplyNoescapeDynamicAppliedClosure : $@convention(thin) (@guaranteed @callee_guaranteed () -> (), @inout_aliasable Builtin.Int64) -> () {
bb0(%0 : @guaranteed $@callee_guaranteed () -> (), %1 : $*Builtin.Int64):
  %4 = begin_access [modify] [unknown] %1 : $*Builtin.Int64

  %5 = function_ref @takesInoutAndClosure : $@convention(thin) (@inout Builtin.Int64, @guaranteed @callee_guaranteed () -> ()) -> ()
  %6 = apply %5(%4, %0) : $@convention(thin) (@inout Builtin.Int64, @guaranteed @callee_guaranteed () -> ()) -> ()
  end_access %4 : $*Builtin.Int64
  %8 = tuple ()
  return %8 : $()
}