7349d90b74
Summary: Class with no user-defined destructor that has an inherited member that has a non-trivial destructor and a non-default constructor will attempt to emit a destructor despite being marked as __attribute((no_destroy)) in which case it would trigger an assertion due to an incorrect assumption. In addition this adds missing test coverage for IR generation for no_destroy. (Note that here use of no_destroy is synonymous with its global flag counterpart `-fno-c++-static-destructors` being enabled) Differential Revision: https://reviews.llvm.org/D54344 llvm-svn: 346628
43 lines
1.6 KiB
C++
43 lines
1.6 KiB
C++
// RUN: %clang_cc1 -std=c++2a -emit-llvm -O0 -triple x86_64-unknown-linux-gnu -DNOATTR %s -o - | FileCheck %s
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// RUN: %clang_cc1 -std=c++2a -emit-llvm -O0 -triple x86_64-unknown-linux-gnu %s -o - | FileCheck %s --check-prefix=CHECK-ATTR
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// RUN: %clang_cc1 -std=c++2a -emit-llvm -O0 -triple x86_64-unknown-linux-gnu -DNOATTR -fno-c++-static-destructors %s -o - | FileCheck %s --check-prefix=CHECK-FLAG
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// Regression test for D54344. Class with no user-defined destructor
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// that has an inherited member that has a non-trivial destructor
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// and a non-default constructor will attempt to emit a destructor
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// despite being marked as __attribute((no_destroy)) in which case
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// it would trigger an assertion due to an incorrect assumption.
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// This test is more reliable with asserts to work as without
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// the crash may (unlikely) could generate working but semantically
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// incorrect code.
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class a {
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public:
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~a();
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};
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class logger_base {
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a d;
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};
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class e : logger_base {};
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#ifndef NOATTR
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__attribute((no_destroy))
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#endif
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e g;
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// In the absence of the attribute and flag, both ctor and dtor should
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// be emitted, check for that.
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// CHECK: @__cxx_global_var_init
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// CHECK: @__cxa_atexit
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// When attribute is enabled, the constructor should not be balanced
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// by a destructor. Make sure we have the ctor but not the dtor
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// registration.
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// CHECK-ATTR: @__cxx_global_var_init
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// CHECK-ATTR-NOT: @__cxa_atexit
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// Same scenario except with global flag (-fno-c++-static-destructors)
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// supressing it instead of the attribute.
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// CHECK-FLAG: @__cxx_global_var_init
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// CHECK-FLAG-NOT: @__cxa_atexit
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