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-rw-r--r--clang/test/CIR/CodeGen/dynamic-cast-exact.cpp174
1 files changed, 174 insertions, 0 deletions
diff --git a/clang/test/CIR/CodeGen/dynamic-cast-exact.cpp b/clang/test/CIR/CodeGen/dynamic-cast-exact.cpp
new file mode 100644
index 0000000..e3b8533
--- /dev/null
+++ b/clang/test/CIR/CodeGen/dynamic-cast-exact.cpp
@@ -0,0 +1,174 @@
+// RUN: %clang_cc1 -triple x86_64-unknown-linux-gnu -std=c++20 -O1 -fclangir -clangir-disable-passes -emit-cir -o %t.cir %s
+// RUN: FileCheck --input-file=%t.cir %s --check-prefix=CIR
+// RUN: %clang_cc1 -triple x86_64-unknown-linux-gnu -std=c++20 -O1 -fclangir -emit-llvm -o %t-cir.ll %s
+// RUN: FileCheck --input-file=%t-cir.ll --check-prefix=LLVM %s
+// RUN: %clang_cc1 -triple x86_64-unknown-linux-gnu -std=c++20 -O1 -emit-llvm -o %t.ll %s
+// RUN: FileCheck --input-file=%t.ll --check-prefix=OGCG %s
+
+struct Base1 {
+ virtual ~Base1();
+};
+
+struct Base2 {
+ virtual ~Base2();
+};
+
+struct Derived final : Base1 {};
+
+Derived *ptr_cast(Base1 *ptr) {
+ return dynamic_cast<Derived *>(ptr);
+}
+
+// CIR: cir.func {{.*}} @_Z8ptr_castP5Base1
+// CIR: %[[SRC:.*]] = cir.load{{.*}} %{{.+}} : !cir.ptr<!cir.ptr<!rec_Base1>>, !cir.ptr<!rec_Base1>
+// CIR-NEXT: %[[NULL_PTR:.*]] = cir.const #cir.ptr<null>
+// CIR-NEXT: %[[SRC_IS_NULL:.*]] = cir.cmp(eq, %[[SRC]], %[[NULL_PTR]])
+// CIR-NEXT: %[[RESULT:.*]] = cir.ternary(%[[SRC_IS_NULL]], true {
+// CIR-NEXT: %[[NULL_PTR_DEST:.*]] = cir.const #cir.ptr<null> : !cir.ptr<!rec_Derived>
+// CIR-NEXT: cir.yield %[[NULL_PTR_DEST]] : !cir.ptr<!rec_Derived>
+// CIR-NEXT: }, false {
+// CIR-NEXT: %[[EXPECTED_VPTR:.*]] = cir.vtable.address_point(@_ZTV7Derived, address_point = <index = 0, offset = 2>) : !cir.vptr
+// CIR-NEXT: %[[SRC_VPTR_PTR:.*]] = cir.cast bitcast %[[SRC]] : !cir.ptr<!rec_Base1> -> !cir.ptr<!cir.vptr>
+// CIR-NEXT: %[[SRC_VPTR:.*]] = cir.load{{.*}} %[[SRC_VPTR_PTR]] : !cir.ptr<!cir.vptr>, !cir.vptr
+// CIR-NEXT: %[[SUCCESS:.*]] = cir.cmp(eq, %[[SRC_VPTR]], %[[EXPECTED_VPTR]]) : !cir.vptr, !cir.bool
+// CIR-NEXT: %[[EXACT_RESULT:.*]] = cir.ternary(%[[SUCCESS]], true {
+// CIR-NEXT: %[[RES:.*]] = cir.cast bitcast %[[SRC]] : !cir.ptr<!rec_Base1> -> !cir.ptr<!rec_Derived>
+// CIR-NEXT: cir.yield %[[RES]] : !cir.ptr<!rec_Derived>
+// CIR-NEXT: }, false {
+// CIR-NEXT: %[[NULL:.*]] = cir.const #cir.ptr<null> : !cir.ptr<!rec_Derived>
+// CIR-NEXT: cir.yield %[[NULL]] : !cir.ptr<!rec_Derived>
+// CIR-NEXT: }) : (!cir.bool) -> !cir.ptr<!rec_Derived>
+// CIR-NEXT: cir.yield %[[EXACT_RESULT]] : !cir.ptr<!rec_Derived>
+// CIR-NEXT: }) : (!cir.bool) -> !cir.ptr<!rec_Derived>
+
+// Note: The LLVM output omits the label for the entry block (which is
+// implicitly %1), so we use %{{.*}} to match the implicit label in the
+// phi check.
+
+// LLVM: define dso_local ptr @_Z8ptr_castP5Base1(ptr{{.*}} %[[SRC:.*]])
+// LLVM-NEXT: %[[SRC_IS_NULL:.*]] = icmp eq ptr %0, null
+// LLVM-NEXT: br i1 %[[SRC_IS_NULL]], label %[[LABEL_END:.*]], label %[[LABEL_NOTNULL:.*]]
+// LLVM: [[LABEL_NOTNULL]]:
+// LLVM-NEXT: %[[VPTR:.*]] = load ptr, ptr %[[SRC]], align 8
+// LLVM-NEXT: %[[SUCCESS:.*]] = icmp eq ptr %[[VPTR]], getelementptr inbounds nuw (i8, ptr @_ZTV7Derived, i64 16)
+// LLVM-NEXT: %[[EXACT_RESULT:.*]] = select i1 %[[SUCCESS]], ptr %[[SRC]], ptr null
+// LLVM-NEXT: br label %[[LABEL_END]]
+// LLVM: [[LABEL_END]]:
+// LLVM-NEXT: %[[RESULT:.*]] = phi ptr [ %[[EXACT_RESULT]], %[[LABEL_NOTNULL]] ], [ null, %{{.*}} ]
+// LLVM-NEXT: ret ptr %[[RESULT]]
+// LLVM-NEXT: }
+
+// OGCG: define{{.*}} ptr @_Z8ptr_castP5Base1(ptr {{.*}} %[[SRC:.*]])
+// OGCG-NEXT: entry:
+// OGCG-NEXT: %[[NULL_CHECK:.*]] = icmp eq ptr %[[SRC]], null
+// OGCG-NEXT: br i1 %[[NULL_CHECK]], label %[[LABEL_NULL:.*]], label %[[LABEL_NOTNULL:.*]]
+// OGCG: [[LABEL_NOTNULL]]:
+// OGCG-NEXT: %[[VTABLE:.*]] = load ptr, ptr %[[SRC]], align 8
+// OGCG-NEXT: %[[VTABLE_CHECK:.*]] = icmp eq ptr %[[VTABLE]], getelementptr inbounds {{.*}} (i8, ptr @_ZTV7Derived, i64 16)
+// OGCG-NEXT: br i1 %[[VTABLE_CHECK]], label %[[LABEL_END:.*]], label %[[LABEL_NULL]]
+// OGCG: [[LABEL_NULL]]:
+// OGCG-NEXT: br label %[[LABEL_END]]
+// OGCG: [[LABEL_END]]:
+// OGCG-NEXT: %[[RESULT:.*]] = phi ptr [ %[[SRC]], %[[LABEL_NOTNULL]] ], [ null, %[[LABEL_NULL]] ]
+// OGCG-NEXT: ret ptr %[[RESULT]]
+// OGCG-NEXT: }
+
+Derived &ref_cast(Base1 &ref) {
+ return dynamic_cast<Derived &>(ref);
+}
+
+// CIR: cir.func {{.*}} @_Z8ref_castR5Base1
+// CIR: %[[SRC:.*]] = cir.load{{.*}} %{{.+}} : !cir.ptr<!cir.ptr<!rec_Base1>>, !cir.ptr<!rec_Base1>
+// CIR-NEXT: %[[EXPECTED_VPTR:.*]] = cir.vtable.address_point(@_ZTV7Derived, address_point = <index = 0, offset = 2>) : !cir.vptr
+// CIR-NEXT: %[[SRC_VPTR_PTR:.*]] = cir.cast bitcast %[[SRC]] : !cir.ptr<!rec_Base1> -> !cir.ptr<!cir.vptr>
+// CIR-NEXT: %[[SRC_VPTR:.*]] = cir.load{{.*}} %[[SRC_VPTR_PTR]] : !cir.ptr<!cir.vptr>, !cir.vptr
+// CIR-NEXT: %[[SUCCESS:.*]] = cir.cmp(eq, %[[SRC_VPTR]], %[[EXPECTED_VPTR]]) : !cir.vptr, !cir.bool
+// CIR-NEXT: %[[FAILED:.*]] = cir.unary(not, %[[SUCCESS]]) : !cir.bool, !cir.bool
+// CIR-NEXT: cir.if %[[FAILED]] {
+// CIR-NEXT: cir.call @__cxa_bad_cast() : () -> ()
+// CIR-NEXT: cir.unreachable
+// CIR-NEXT: }
+// CIR-NEXT: %{{.+}} = cir.cast bitcast %[[SRC]] : !cir.ptr<!rec_Base1> -> !cir.ptr<!rec_Derived>
+
+// LLVM: define{{.*}} ptr @_Z8ref_castR5Base1(ptr{{.*}} %[[SRC:.*]])
+// LLVM-NEXT: %[[VPTR:.*]] = load ptr, ptr %[[SRC]], align 8
+// LLVM-NEXT: %[[OK:.*]] = icmp eq ptr %[[VPTR]], getelementptr inbounds nuw (i8, ptr @_ZTV7Derived, i64 16)
+// LLVM-NEXT: br i1 %[[OK]], label %[[LABEL_OK:.*]], label %[[LABEL_FAIL:.*]]
+// LLVM: [[LABEL_FAIL]]:
+// LLVM-NEXT: tail call void @__cxa_bad_cast()
+// LLVM-NEXT: unreachable
+// LLVM: [[LABEL_OK]]:
+// LLVM-NEXT: ret ptr %[[SRC]]
+// LLVM-NEXT: }
+
+// OGCG: define{{.*}} ptr @_Z8ref_castR5Base1(ptr {{.*}} %[[REF:.*]])
+// OGCG-NEXT: entry:
+// OGCG-NEXT: %[[VTABLE:.*]] = load ptr, ptr %[[REF]], align 8
+// OGCG-NEXT: %[[VTABLE_CHECK:.*]] = icmp eq ptr %[[VTABLE]], getelementptr inbounds {{.*}} (i8, ptr @_ZTV7Derived, i64 16)
+// OGCG-NEXT: br i1 %[[VTABLE_CHECK]], label %[[LABEL_END:.*]], label %[[LABEL_NULL:.*]]
+// OGCG: [[LABEL_NULL]]:
+// OGCG-NEXT: {{.*}}call void @__cxa_bad_cast()
+// OGCG-NEXT: unreachable
+// OGCG: [[LABEL_END]]:
+// OGCG-NEXT: ret ptr %[[REF]]
+// OGCG-NEXT: }
+
+struct Offset { virtual ~Offset(); };
+struct A { virtual ~A(); };
+struct B final : Offset, A { };
+
+B *offset_cast(A *a) {
+ return dynamic_cast<B*>(a);
+}
+
+// CIR: cir.func {{.*}} @_Z11offset_castP1A
+// CIR: %[[SRC:.*]] = cir.load{{.*}} %{{.+}} : !cir.ptr<!cir.ptr<!rec_A>>, !cir.ptr<!rec_A>
+// CIR-NEXT: %[[NULL_PTR:.*]] = cir.const #cir.ptr<null>
+// CIR-NEXT: %[[SRC_IS_NULL:.*]] = cir.cmp(eq, %[[SRC]], %[[NULL_PTR]])
+// CIR-NEXT: %[[RESULT:.*]] = cir.ternary(%[[SRC_IS_NULL]], true {
+// CIR-NEXT: %[[NULL_PTR_DEST:.*]] = cir.const #cir.ptr<null> : !cir.ptr<!rec_B>
+// CIR-NEXT: cir.yield %[[NULL_PTR_DEST]] : !cir.ptr<!rec_B>
+// CIR-NEXT: }, false {
+// CIR-NEXT: %[[EXPECTED_VPTR:.*]] = cir.vtable.address_point(@_ZTV1B, address_point = <index = 1, offset = 2>) : !cir.vptr
+// CIR-NEXT: %[[SRC_VPTR_PTR:.*]] = cir.cast bitcast %[[SRC]] : !cir.ptr<!rec_A> -> !cir.ptr<!cir.vptr>
+// CIR-NEXT: %[[SRC_VPTR:.*]] = cir.load{{.*}} %[[SRC_VPTR_PTR]] : !cir.ptr<!cir.vptr>, !cir.vptr
+// CIR-NEXT: %[[SUCCESS:.*]] = cir.cmp(eq, %[[SRC_VPTR]], %[[EXPECTED_VPTR]]) : !cir.vptr, !cir.bool
+// CIR-NEXT: %[[EXACT_RESULT:.*]] = cir.ternary(%[[SUCCESS]], true {
+// CIR-NEXT: %[[MINUS_EIGHT:.*]] = cir.const #cir.int<18446744073709551608> : !u64i
+// CIR-NEXT: %[[SRC_VOID:.*]] = cir.cast bitcast %[[SRC]] : !cir.ptr<!rec_A> -> !cir.ptr<!u8i>
+// CIR-NEXT: %[[SRC_OFFSET:.*]] = cir.ptr_stride %[[SRC_VOID]], %[[MINUS_EIGHT]]
+// CIR-NEXT: %[[RES:.*]] = cir.cast bitcast %[[SRC_OFFSET]] : !cir.ptr<!u8i> -> !cir.ptr<!rec_B>
+// CIR-NEXT: cir.yield %[[RES]] : !cir.ptr<!rec_B>
+// CIR-NEXT: }, false {
+// CIR-NEXT: %[[NULL:.*]] = cir.const #cir.ptr<null> : !cir.ptr<!rec_B>
+// CIR-NEXT: cir.yield %[[NULL]] : !cir.ptr<!rec_B>
+// CIR-NEXT: }) : (!cir.bool) -> !cir.ptr<!rec_B>
+// CIR-NEXT: cir.yield %[[EXACT_RESULT]] : !cir.ptr<!rec_B>
+// CIR-NEXT: }) : (!cir.bool) -> !cir.ptr<!rec_B>
+
+// LLVM: define dso_local ptr @_Z11offset_castP1A(ptr{{.*}} %[[SRC:.*]])
+// LLVM-NEXT: %[[SRC_IS_NULL:.*]] = icmp eq ptr %0, null
+// LLVM-NEXT: br i1 %[[SRC_IS_NULL]], label %[[LABEL_END:.*]], label %[[LABEL_NOTNULL:.*]]
+// LLVM: [[LABEL_NOTNULL]]:
+// LLVM-NEXT: %[[VTABLE:.*]] = load ptr, ptr %[[SRC]]
+// LLVM-NEXT: %[[VTABLE_CHECK:.*]] = icmp eq ptr %[[VTABLE]], getelementptr inbounds nuw (i8, ptr @_ZTV1B, i64 48)
+// LLVM-NEXT: %[[SRC_OFFSET:.*]] = getelementptr i8, ptr %[[SRC]], i64 -8
+// LLVM-NEXT: %[[EXACT_RESULT:.*]] = select i1 %[[VTABLE_CHECK]], ptr %[[SRC_OFFSET]], ptr null
+// LLVM-NEXT: br label %[[LABEL_END]]
+// LLVM: [[LABEL_END]]:
+// LLVM-NEXT: %[[RESULT:.*]] = phi ptr [ %[[EXACT_RESULT]], %[[LABEL_NOTNULL]] ], [ null, %{{.*}} ]
+// LLVM-NEXT: ret ptr %[[RESULT]]
+// LLVM-NEXT: }
+
+// OGCG: define{{.*}} ptr @_Z11offset_castP1A(ptr{{.*}} %[[SRC:.*]])
+// OGCG: %[[SRV_NULL:.*]] = icmp eq ptr %[[SRC]], null
+// OGCG-NEXT: br i1 %[[SRV_NULL]], label %[[LABEL_NULL:.*]], label %[[LABEL_NOTNULL:.*]]
+// OGCG: [[LABEL_NOTNULL]]:
+// OGCG-NEXT: %[[VTABLE:.*]] = load ptr, ptr %[[SRC]]
+// OGCG-NEXT: %[[VTABLE_CHECK:.*]] = icmp eq ptr %[[VTABLE]], getelementptr inbounds nuw inrange(-16, 16) (i8, ptr @_ZTV1B, i64 48)
+// OGCG-NEXT: %[[RESULT:.*]] = getelementptr inbounds i8, ptr %[[SRC]], i64 -8
+// OGCG-NEXT: br i1 %[[VTABLE_CHECK]], label %[[LABEL_END:.*]], label %[[LABEL_NULL]]
+// OGCG: [[LABEL_NULL]]:
+// OGCG-NEXT: br label %[[LABEL_END]]
+// OGCG: [[LABEL_END]]:
+// OGCG-NEXT: phi ptr [ %[[RESULT]], %[[LABEL_NOTNULL]] ], [ null, %[[LABEL_NULL]] ]
generated by cgit v1.1 at 2025-10-23 18:02:36 +0000