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.
llvm-svn: 213386
diff --git a/clang/test/CodeGenCXX/copy-constructor-synthesis.cpp b/clang/test/CodeGenCXX/copy-constructor-synthesis.cpp
index bb06bc1..47f8e13 100644
--- a/clang/test/CodeGenCXX/copy-constructor-synthesis.cpp
+++ b/clang/test/CodeGenCXX/copy-constructor-synthesis.cpp
@@ -21,7 +21,7 @@
};
-// CHECK-LABEL: define linkonce_odr void @_ZN1XC1ERKS_(%struct.X* %this, %struct.X* nonnull) unnamed_addr
+// CHECK-LABEL: define linkonce_odr void @_ZN1XC1ERKS_(%struct.X* %this, %struct.X* dereferenceable({{[0-9]+}})) unnamed_addr
struct X : M, N, P { // ...
X() : f1(1.0), d1(2.0), i1(3), name("HELLO"), bf1(0xff), bf2(0xabcd),
au_i1(1234), au1_4("MASKED") {}
@@ -136,7 +136,7 @@
B b2 = b1;
}
-// CHECK: define linkonce_odr nonnull [[A:%.*]]* @_ZN12rdar138169401AaSERKS0_(
+// CHECK: define linkonce_odr dereferenceable({{[0-9]+}}) [[A:%.*]]* @_ZN12rdar138169401AaSERKS0_(
// CHECK: [[THIS:%.*]] = load [[A]]**
// CHECK-NEXT: [[T0:%.*]] = getelementptr inbounds [[A]]* [[THIS]], i32 0, i32 1
// CHECK-NEXT: [[OTHER:%.*]] = load [[A]]**
@@ -158,7 +158,7 @@
// CHECK-NEXT: call void @llvm.memcpy.p0i8.p0i8.i64(i8* [[T4]], i8* [[T5]], i64 8, i32 8, i1 false)
// CHECK-NEXT: ret void
-// CHECK-LABEL: define linkonce_odr void @_ZN6PR66281BC2ERKS0_(%"struct.PR6628::B"* %this, %"struct.PR6628::B"* nonnull) unnamed_addr
+// CHECK-LABEL: define linkonce_odr void @_ZN6PR66281BC2ERKS0_(%"struct.PR6628::B"* %this, %"struct.PR6628::B"* dereferenceable({{[0-9]+}})) unnamed_addr
// CHECK: call void @_ZN6PR66281TC1Ev
// CHECK: call void @_ZN6PR66281TC1Ev
// CHECK: call void @_ZN6PR66281AC2ERKS0_RKNS_1TES5_