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// RUN: %clang_cc1 -fcatch-undefined-behavior -emit-llvm %s -o - -triple x86_64-linux-gnu | FileCheck %s
// CHECK: @_Z17reference_binding
void reference_binding(int *p) {
// C++ core issue 453: If an lvalue to which a reference is directly bound
// designates neither an existing object or function of an appropriate type,
// nor a region of storage of suitable size and alignment to contain an object
// of the reference's type, the behavior is undefined.
// CHECK: icmp ne {{.*}}, null
// CHECK: %[[SIZE:.*]] = call i64 @llvm.objectsize.i64
// CHECK-NEXT: icmp uge i64 %[[SIZE]], 4
// CHECK: %[[PTRINT:.*]] = ptrtoint
// CHECK-NEXT: %[[MISALIGN:.*]] = and i64 %[[PTRINT]], 3
// CHECK-NEXT: icmp eq i64 %[[MISALIGN]], 0
int &r = *p;
}
struct S {
double d;
int a, b;
virtual int f();
};
// CHECK: @_Z13member_access
void member_access(S *p) {
// (1) Check 'p' is appropriately sized and aligned for member access.
// FIXME: Check vptr is for 'S' or a class derived from 'S'.
// CHECK: icmp ne {{.*}}, null
// CHECK: %[[SIZE:.*]] = call i64 @llvm.objectsize.i64
// CHECK-NEXT: icmp uge i64 %[[SIZE]], 24
// CHECK: %[[PTRINT:.*]] = ptrtoint
// CHECK-NEXT: %[[MISALIGN:.*]] = and i64 %[[PTRINT]], 7
// CHECK-NEXT: icmp eq i64 %[[MISALIGN]], 0
// (2) Check 'p->b' is appropriately sized and aligned for a load.
// FIXME: Suppress this in the trivial case of a member access, because we
// know we've just checked the member access expression itself.
// CHECK: %[[SIZE:.*]] = call i64 @llvm.objectsize.i64
// CHECK-NEXT: icmp uge i64 %[[SIZE]], 4
// CHECK: %[[PTRINT:.*]] = ptrtoint
// CHECK-NEXT: %[[MISALIGN:.*]] = and i64 %[[PTRINT]], 3
// CHECK-NEXT: icmp eq i64 %[[MISALIGN]], 0
int k = p->b;
// (3) Check 'p' is appropriately sized and aligned for member function call.
// FIXME: Check vptr is for 'S' or a class derived from 'S'.
// CHECK: icmp ne {{.*}}, null
// CHECK: %[[SIZE:.*]] = call i64 @llvm.objectsize.i64
// CHECK-NEXT: icmp uge i64 %[[SIZE]], 24
// CHECK: %[[PTRINT:.*]] = ptrtoint
// CHECK-NEXT: %[[MISALIGN:.*]] = and i64 %[[PTRINT]], 7
// CHECK-NEXT: icmp eq i64 %[[MISALIGN]], 0
k = p->f();
}
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