a3d8b78333
According to the C++ standard, `dynamic_cast` of pointers either returns a pointer (7.6.1.7) or results in undefined behavior (11.9.5). This patch marks `__dynamic_cast` as `willreturn` to remove unused calls. Fixes #77606.
25 lines
750 B
C++
25 lines
750 B
C++
// RUN: %clang_cc1 -I%S %s -triple x86_64-apple-darwin10 -emit-llvm -fcxx-exceptions -fexceptions -o - | FileCheck %s
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struct A { virtual void f(); };
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struct B : A { };
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// CHECK: {{define.*@_Z1fP1A}}
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// CHECK-SAME: personality ptr @__gxx_personality_v0
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B fail;
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const B& f(A *a) {
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try {
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// CHECK: call ptr @__dynamic_cast
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// CHECK: br i1
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// CHECK: invoke void @__cxa_bad_cast() [[NR:#[0-9]+]]
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dynamic_cast<const B&>(*a);
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} catch (...) {
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// CHECK: landingpad { ptr, i32 }
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// CHECK-NEXT: catch ptr null
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}
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return fail;
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}
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// CHECK: declare ptr @__dynamic_cast(ptr, ptr, ptr, i64) [[NUW_RO:#[0-9]+]]
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// CHECK: attributes [[NUW_RO]] = { nounwind willreturn memory(read) }
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// CHECK: attributes [[NR]] = { noreturn }
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