Mark C++ reference parameters as dereferenceable

Because references must be initialized using some evaluated expression, they
must point to something, and a callee can assume the reference parameter is
dereferenceable. Taking advantage of a new attribute just added to LLVM, mark
them as such.

Because dereferenceability in addrspace(0) implies nonnull in the backend, we
don't need both attributes. However, we need to know the size of the object to
use the dereferenceable attribute, so for incomplete types we still emit only
nonnull.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@213386 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 26 insertions, 26 deletions

diff --git a/test/CodeGenCXX/pod-member-memcpys.cpp b/test/CodeGenCXX/pod-member-memcpys.cpp
index 396129e851..31d774c534 100644
--- a/test/CodeGenCXX/pod-member-memcpys.cpp
+++ b/test/CodeGenCXX/pod-member-memcpys.cpp
@@ -108,59 +108,59 @@ CALL_AO(InnerClassMember)
 CALL_AO(PackedMembers)
 
 // Basic copy-assignment:
-// CHECK-LABEL: define linkonce_odr nonnull %struct.Basic* @_ZN5BasicaSERKS_(%struct.Basic* %this, %struct.Basic* nonnull)
+// CHECK-LABEL: define linkonce_odr dereferenceable({{[0-9]+}}) %struct.Basic* @_ZN5BasicaSERKS_(%struct.Basic* %this, %struct.Basic* dereferenceable({{[0-9]+}}))
 // CHECK: call void @llvm.memcpy.p0i8.p0i8.i64({{.*}}i64 16, i32 4{{.*}})
-// CHECK: call nonnull %struct.NonPOD* @_ZN6NonPODaSERKS_
+// CHECK: call dereferenceable({{[0-9]+}}) %struct.NonPOD* @_ZN6NonPODaSERKS_
 // CHECK: call void @llvm.memcpy.p0i8.p0i8.i64({{.*}}i64 16, i32 4{{.*}})
 // CHECK: ret %struct.Basic*
 
 // PODMember copy-assignment:
-// CHECK-LABEL: define linkonce_odr nonnull %struct.PODMember* @_ZN9PODMemberaSERKS_(%struct.PODMember* %this, %struct.PODMember* nonnull)
+// CHECK-LABEL: define linkonce_odr dereferenceable({{[0-9]+}}) %struct.PODMember* @_ZN9PODMemberaSERKS_(%struct.PODMember* %this, %struct.PODMember* dereferenceable({{[0-9]+}}))
 // CHECK: call void @llvm.memcpy.p0i8.p0i8.i64({{.*}}i64 32, i32 4{{.*}})
-// CHECK: call nonnull %struct.NonPOD* @_ZN6NonPODaSERKS_
+// CHECK: call dereferenceable({{[0-9]+}}) %struct.NonPOD* @_ZN6NonPODaSERKS_
 // CHECK: call void @llvm.memcpy.p0i8.p0i8.i64({{.*}}i64 16, i32 4{{.*}})
 // CHECK: ret %struct.PODMember*
 
 // PODLikeMember copy-assignment:
-// CHECK-LABEL: define linkonce_odr nonnull %struct.PODLikeMember* @_ZN13PODLikeMemberaSERKS_(%struct.PODLikeMember* %this, %struct.PODLikeMember* nonnull)
+// CHECK-LABEL: define linkonce_odr dereferenceable({{[0-9]+}}) %struct.PODLikeMember* @_ZN13PODLikeMemberaSERKS_(%struct.PODLikeMember* %this, %struct.PODLikeMember* dereferenceable({{[0-9]+}}))
 // CHECK: call void @llvm.memcpy.p0i8.p0i8.i64({{.*}}i64 32, i32 4{{.*}})
-// CHECK: call nonnull %struct.NonPOD* @_ZN6NonPODaSERKS_
+// CHECK: call dereferenceable({{[0-9]+}}) %struct.NonPOD* @_ZN6NonPODaSERKS_
 // CHECK: call void @llvm.memcpy.p0i8.p0i8.i64({{.*}}i64 16, i32 4{{.*}})
 // CHECK: ret %struct.PODLikeMember*
 
 // ArrayMember copy-assignment:
-// CHECK-LABEL: define linkonce_odr nonnull %struct.ArrayMember* @_ZN11ArrayMemberaSERKS_(%struct.ArrayMember* %this, %struct.ArrayMember* nonnull)
+// CHECK-LABEL: define linkonce_odr dereferenceable({{[0-9]+}}) %struct.ArrayMember* @_ZN11ArrayMemberaSERKS_(%struct.ArrayMember* %this, %struct.ArrayMember* dereferenceable({{[0-9]+}}))
 // CHECK: call void @llvm.memcpy.p0i8.p0i8.i64({{.*}}i64 64, i32 4{{.*}})
-// CHECK: call nonnull %struct.NonPOD* @_ZN6NonPODaSERKS_
+// CHECK: call dereferenceable({{[0-9]+}}) %struct.NonPOD* @_ZN6NonPODaSERKS_
 // CHECK: call void @llvm.memcpy.p0i8.p0i8.i64({{.*}}i64 64, i32 4{{.*}})
 // CHECK: ret %struct.ArrayMember*
 
 // VolatileMember copy-assignment:
-// CHECK-LABEL: define linkonce_odr nonnull %struct.VolatileMember* @_ZN14VolatileMemberaSERKS_(%struct.VolatileMember* %this, %struct.VolatileMember* nonnull)
+// CHECK-LABEL: define linkonce_odr dereferenceable({{[0-9]+}}) %struct.VolatileMember* @_ZN14VolatileMemberaSERKS_(%struct.VolatileMember* %this, %struct.VolatileMember* dereferenceable({{[0-9]+}}))
 // CHECK: call void @llvm.memcpy.p0i8.p0i8.i64({{.*}}i64 16, i32 4{{.*}})
 // CHECK: load volatile i32* {{.*}}, align 4
 // CHECK: store volatile i32 {{.*}}, align 4
-// CHECK: call nonnull %struct.NonPOD* @_ZN6NonPODaSERKS_
+// CHECK: call dereferenceable({{[0-9]+}}) %struct.NonPOD* @_ZN6NonPODaSERKS_
 // CHECK: call void @llvm.memcpy.p0i8.p0i8.i64({{.*}}i64 16, i32 4{{.*}})
 // CHECK: ret %struct.VolatileMember*
 
 // BitfieldMember copy-assignment:
-// CHECK-LABEL: define linkonce_odr nonnull %struct.BitfieldMember* @_ZN14BitfieldMemberaSERKS_(%struct.BitfieldMember* %this, %struct.BitfieldMember* nonnull)
+// CHECK-LABEL: define linkonce_odr dereferenceable({{[0-9]+}}) %struct.BitfieldMember* @_ZN14BitfieldMemberaSERKS_(%struct.BitfieldMember* %this, %struct.BitfieldMember* dereferenceable({{[0-9]+}}))
 // CHECK: call void @llvm.memcpy.p0i8.p0i8.i64({{.*}}i64 16, i32 4{{.*}})
-// CHECK: call nonnull %struct.NonPOD* @_ZN6NonPODaSERKS_
+// CHECK: call dereferenceable({{[0-9]+}}) %struct.NonPOD* @_ZN6NonPODaSERKS_
 // CHECK: call void @llvm.memcpy.p0i8.p0i8.i64({{.*}}i64 3, i32 1{{.*}})
 // CHECK: ret %struct.BitfieldMember*
 
 // InnerClass copy-assignment:
-// CHECK-LABEL: define linkonce_odr nonnull %struct.InnerClassMember* @_ZN16InnerClassMemberaSERKS_(%struct.InnerClassMember* %this, %struct.InnerClassMember* nonnull)
+// CHECK-LABEL: define linkonce_odr dereferenceable({{[0-9]+}}) %struct.InnerClassMember* @_ZN16InnerClassMemberaSERKS_(%struct.InnerClassMember* %this, %struct.InnerClassMember* dereferenceable({{[0-9]+}}))
 // CHECK: call void @llvm.memcpy.p0i8.p0i8.i64({{.*}}i64 32, i32 4{{.*}})
-// CHECK: call nonnull %struct.NonPOD* @_ZN6NonPODaSERKS_
+// CHECK: call dereferenceable({{[0-9]+}}) %struct.NonPOD* @_ZN6NonPODaSERKS_
 // CHECK: call void @llvm.memcpy.p0i8.p0i8.i64({{.*}}i64 16, i32 4{{.*}})
 // CHECK: ret %struct.InnerClassMember*
 
 // PackedMembers copy-assignment:
-// CHECK-LABEL: define linkonce_odr nonnull %struct.PackedMembers* @_ZN13PackedMembersaSERKS_(%struct.PackedMembers* %this, %struct.PackedMembers* nonnull)
-// CHECK: call nonnull %struct.NonPOD* @_ZN6NonPODaSERKS_
+// CHECK-LABEL: define linkonce_odr dereferenceable({{[0-9]+}}) %struct.PackedMembers* @_ZN13PackedMembersaSERKS_(%struct.PackedMembers* %this, %struct.PackedMembers* dereferenceable({{[0-9]+}}))
+// CHECK: call dereferenceable({{[0-9]+}}) %struct.NonPOD* @_ZN6NonPODaSERKS_
 // CHECK: call void @llvm.memcpy.p0i8.p0i8.i64({{.*}}i64 16, i32 1{{.*}})
 // CHECK: ret %struct.PackedMembers*
 
@@ -184,21 +184,21 @@ CALL_CC(PODMember)
 CALL_CC(Basic)
 
 // Basic copy-constructor:
-// CHECK-LABEL: define linkonce_odr void @_ZN5BasicC2ERKS_(%struct.Basic* %this, %struct.Basic* nonnull)
+// CHECK-LABEL: define linkonce_odr void @_ZN5BasicC2ERKS_(%struct.Basic* %this, %struct.Basic* dereferenceable({{[0-9]+}}))
 // CHECK: call void @llvm.memcpy.p0i8.p0i8.i64({{.*}}i64 16, i32 4{{.*}})
 // CHECK: call void @_ZN6NonPODC1ERKS_
 // CHECK: call void @llvm.memcpy.p0i8.p0i8.i64({{.*}}i64 16, i32 4{{.*}})
 // CHECK: ret void
 
 // PODMember copy-constructor:
-// CHECK-LABEL: define linkonce_odr void @_ZN9PODMemberC2ERKS_(%struct.PODMember* %this, %struct.PODMember* nonnull)
+// CHECK-LABEL: define linkonce_odr void @_ZN9PODMemberC2ERKS_(%struct.PODMember* %this, %struct.PODMember* dereferenceable({{[0-9]+}}))
 // CHECK: call void @llvm.memcpy.p0i8.p0i8.i64({{.*}}i64 32, i32 4{{.*}})
 // CHECK: call void @_ZN6NonPODC1ERKS_
 // CHECK: call void @llvm.memcpy.p0i8.p0i8.i64({{.*}}i64 16, i32 4{{.*}})
 // CHECK: ret void
 
 // PODLikeMember copy-constructor:
-// CHECK-LABEL: define linkonce_odr void @_ZN13PODLikeMemberC2ERKS_(%struct.PODLikeMember* %this, %struct.PODLikeMember* nonnull)
+// CHECK-LABEL: define linkonce_odr void @_ZN13PODLikeMemberC2ERKS_(%struct.PODLikeMember* %this, %struct.PODLikeMember* dereferenceable({{[0-9]+}}))
 // CHECK: call void @llvm.memcpy.p0i8.p0i8.i64({{.*}}i64 32, i32 4{{.*}})
 // CHECK: invoke void @_ZN6NonPODC1ERKS_
 // CHECK: call void @llvm.memcpy.p0i8.p0i8.i64({{.*}}i64 16, i32 4{{.*}})
@@ -207,14 +207,14 @@ CALL_CC(Basic)
 // CHECK: invoke void @_ZN7PODLikeD1Ev
 
 // ArrayMember copy-constructor:
-// CHECK-LABEL: define linkonce_odr void @_ZN11ArrayMemberC2ERKS_(%struct.ArrayMember* %this, %struct.ArrayMember* nonnull)
+// CHECK-LABEL: define linkonce_odr void @_ZN11ArrayMemberC2ERKS_(%struct.ArrayMember* %this, %struct.ArrayMember* dereferenceable({{[0-9]+}}))
 // CHECK: call void @llvm.memcpy.p0i8.p0i8.i64({{.*}}i64 64, i32 4{{.*}})
 // CHECK: call void @_ZN6NonPODC1ERKS_
 // CHECK: call void @llvm.memcpy.p0i8.p0i8.i64({{.*}}i64 64, i32 4{{.*}})
 // CHECK: ret void
 
 // VolatileMember copy-constructor:
-// CHECK-LABEL: define linkonce_odr void @_ZN14VolatileMemberC2ERKS_(%struct.VolatileMember* %this, %struct.VolatileMember* nonnull)
+// CHECK-LABEL: define linkonce_odr void @_ZN14VolatileMemberC2ERKS_(%struct.VolatileMember* %this, %struct.VolatileMember* dereferenceable({{[0-9]+}}))
 // CHECK: call void @llvm.memcpy.p0i8.p0i8.i64({{.*}}i64 16, i32 4{{.*}})
 // CHECK: load volatile i32* {{.*}}, align 4
 // CHECK: store volatile i32 {{.*}}, align 4
@@ -223,34 +223,34 @@ CALL_CC(Basic)
 // CHECK: ret void
 
 // BitfieldMember copy-constructor:
-// CHECK-LABEL: define linkonce_odr void @_ZN14BitfieldMemberC2ERKS_(%struct.BitfieldMember* %this, %struct.BitfieldMember* nonnull)
+// CHECK-LABEL: define linkonce_odr void @_ZN14BitfieldMemberC2ERKS_(%struct.BitfieldMember* %this, %struct.BitfieldMember* dereferenceable({{[0-9]+}}))
 // CHECK: call void @llvm.memcpy.p0i8.p0i8.i64({{.*}}i64 16, i32 4{{.*}})
 // CHECK: call void @_ZN6NonPODC1ERKS_
 // CHECK: call void @llvm.memcpy.p0i8.p0i8.i64({{.*}}i64 3, i32 1{{.*}})
 // CHECK: ret void
 
 // InnerClass copy-constructor:
-// CHECK-LABEL: define linkonce_odr void @_ZN16InnerClassMemberC2ERKS_(%struct.InnerClassMember* %this, %struct.InnerClassMember* nonnull)
+// CHECK-LABEL: define linkonce_odr void @_ZN16InnerClassMemberC2ERKS_(%struct.InnerClassMember* %this, %struct.InnerClassMember* dereferenceable({{[0-9]+}}))
 // CHECK: call void @llvm.memcpy.p0i8.p0i8.i64({{.*}}i64 32, i32 4{{.*}})
 // CHECK: call void @_ZN6NonPODC1ERKS_
 // CHECK: call void @llvm.memcpy.p0i8.p0i8.i64({{.*}}i64 16, i32 4{{.*}})
 // CHECK: ret void
 
 // ReferenceMember copy-constructor:
-// CHECK-LABEL: define linkonce_odr void @_ZN15ReferenceMemberC2ERKS_(%struct.ReferenceMember* %this, %struct.ReferenceMember* nonnull)
+// CHECK-LABEL: define linkonce_odr void @_ZN15ReferenceMemberC2ERKS_(%struct.ReferenceMember* %this, %struct.ReferenceMember* dereferenceable({{[0-9]+}}))
 // CHECK: call void @llvm.memcpy.p0i8.p0i8.i64({{.*}}i64 16, i32 8{{.*}})
 // CHECK: call void @_ZN6NonPODC1ERKS_
 // CHECK: call void @llvm.memcpy.p0i8.p0i8.i64({{.*}}i64 16, i32 8{{.*}})
 // CHECK: ret void
 
 // BitfieldMember2 copy-constructor:
-// CHECK-2-LABEL: define linkonce_odr void @_ZN15BitfieldMember2C2ERKS_(%struct.BitfieldMember2* %this, %struct.BitfieldMember2* nonnull)
+// CHECK-2-LABEL: define linkonce_odr void @_ZN15BitfieldMember2C2ERKS_(%struct.BitfieldMember2* %this, %struct.BitfieldMember2* dereferenceable({{[0-9]+}}))
 // CHECK-2: call void @llvm.memcpy.p0i8.p0i8.i64({{.*}}i64 16, i32 4, i1 false)
 // CHECK-2: call void @_ZN6NonPODC1ERKS_
 // CHECK-2: ret void
 
 // PackedMembers copy-assignment:
-// CHECK-LABEL: define linkonce_odr void @_ZN13PackedMembersC2ERKS_(%struct.PackedMembers* %this, %struct.PackedMembers* nonnull)
+// CHECK-LABEL: define linkonce_odr void @_ZN13PackedMembersC2ERKS_(%struct.PackedMembers* %this, %struct.PackedMembers* dereferenceable({{[0-9]+}}))
 // CHECK: call void @_ZN6NonPODC1ERKS_
 // CHECK: call void @llvm.memcpy.p0i8.p0i8.i64({{.*}}i64 16, i32 1{{.*}})
 // CHECK: ret void