74 lines
2.5 KiB
C++
74 lines
2.5 KiB
C++
// dynamic_cast
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// Ensure that dynamic casting works normally
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// RUN: %clang_cc1 %s -triple=aarch64-unknown-fuchsia -O3 -S -o - -emit-llvm | FileCheck %s
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// CHECK: define{{.*}} ptr @_Z6upcastP1B(ptr noundef readnone returned %b) local_unnamed_addr
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// CHECK-NEXT: entry:
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// CHECK-NEXT: ret ptr %b
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// CHECK-NEXT: }
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// CHECK: define{{.*}} ptr @_Z8downcastP1A(ptr noundef readonly %a) local_unnamed_addr
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// CHECK-NEXT: entry:
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// CHECK-NEXT: [[isnull:%[0-9]+]] = icmp eq ptr %a, null
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// CHECK-NEXT: br i1 [[isnull]], label %[[dynamic_cast_end:[a-z0-9._]+]], label %[[dynamic_cast_notnull:[a-z0-9._]+]]
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// CHECK: [[dynamic_cast_notnull]]:
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// CHECK-NEXT: [[as_b:%[0-9]+]] = tail call ptr @__dynamic_cast(ptr nonnull %a, ptr nonnull @_ZTI1A, ptr nonnull @_ZTI1B, i64 0)
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// CHECK-NEXT: br label %[[dynamic_cast_end]]
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// CHECK: [[dynamic_cast_end]]:
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// CHECK-NEXT: [[res:%[0-9]+]] = phi ptr [ [[as_b]], %[[dynamic_cast_notnull]] ], [ null, %entry ]
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// CHECK-NEXT: ret ptr [[res]]
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// CHECK-NEXT: }
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// CHECK: declare ptr @__dynamic_cast(ptr, ptr, ptr, i64) local_unnamed_addr
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// CHECK: define{{.*}} ptr @_Z8selfcastP1B(ptr noundef readnone returned %b) local_unnamed_addr
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// CHECK-NEXT: entry
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// CHECK-NEXT: ret ptr %b
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// CHECK-NEXT: }
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// CHECK: define{{.*}} ptr @_Z9void_castP1B(ptr noundef readonly %b) local_unnamed_addr
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// CHECK-NEXT: entry:
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// CHECK-NEXT: [[isnull:%[0-9]+]] = icmp eq ptr %b, null
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// CHECK-NEXT: br i1 [[isnull]], label %[[dynamic_cast_end:[a-z0-9._]+]], label %[[dynamic_cast_notnull:[a-z0-9._]+]]
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// CHECK: [[dynamic_cast_notnull]]:
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// CHECK-DAG: [[vtable:%[a-z0-9]+]] = load ptr, ptr %b, align 8
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// CHECK-DAG: [[offset_ptr:%.+]] = getelementptr inbounds i32, ptr [[vtable]], i64 -2
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// CHECK-DAG: [[offset_to_top:%.+]] = load i32, ptr [[offset_ptr]], align 4
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// CHECK-DAG: [[offset_to_top2:%.+]] = sext i32 [[offset_to_top]] to i64
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// CHECK-DAG: [[casted:%.+]] = getelementptr inbounds i8, ptr %b, i64 [[offset_to_top2]]
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// CHECK-NEXT: br label %[[dynamic_cast_end]]
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// CHECK: [[dynamic_cast_end]]:
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// CHECK-NEXT: [[res:%[0-9]+]] = phi ptr [ [[casted]], %[[dynamic_cast_notnull]] ], [ null, %entry ]
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// CHECK-NEXT: ret ptr [[res]]
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// CHECK-NEXT: }
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class A {
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public:
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virtual void foo();
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};
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class B : public A {
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public:
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void foo() override;
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};
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void A::foo() {}
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void B::foo() {}
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A *upcast(B *b) {
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return dynamic_cast<A *>(b);
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}
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B *downcast(A *a) {
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return dynamic_cast<B *>(a);
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}
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B *selfcast(B *b) {
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return dynamic_cast<B *>(b);
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}
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void *void_cast(B *b) {
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return dynamic_cast<void *>(b);
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}
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