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