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060137038a
The PR reapply https://github.com/llvm/llvm-project/pull/97308. - Implement [CWG1815](https://wg21.link/CWG1815): Support lifetime extension of temporary created by aggregate initialization using a default member initializer. - Fix crash that introduced in https://github.com/llvm/llvm-project/pull/97308. In `InitListChecker::FillInEmptyInitForField`, when we enter rebuild-default-init context, we copy all the contents of the parent context to the current context, which will cause the `MaybeODRUseExprs` to be lost. But we don't need to copy the entire context, only the `DelayedDefaultInitializationContext` was required, which is used to build `SourceLocExpr`, etc. --------- Signed-off-by: yronglin <yronglin777@gmail.com>
40 lines
1.1 KiB
C++
40 lines
1.1 KiB
C++
// RUN: %clang_cc1 -std=c++1y -o - -emit-llvm -verify %s
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// RUN: %clang_cc1 -std=c++1y -fexperimental-new-constant-interpreter -o - -emit-llvm -verify %s
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namespace default_arg_temporary {
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constexpr bool equals(const float& arg = 1.0f) {
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return arg == 1.0f;
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}
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constexpr const int &x(const int &p = 0) {
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return p;
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}
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struct S {
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constexpr S(const int &a = 0) {}
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};
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void test_default_arg2() {
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// This piece of code used to cause an assertion failure in
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// CallStackFrame::createTemporary because the same MTE is used to initilize
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// both elements of the array (see PR33140).
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constexpr S s[2] = {};
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// This piece of code used to cause an assertion failure in
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// CallStackFrame::createTemporary because multiple CXXDefaultArgExpr share
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// the same MTE (see PR33140).
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static_assert(equals() && equals(), "");
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// Test that constant expression evaluation produces distinct lvalues for
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// each call.
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static_assert(&x() != &x(), "");
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}
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// Check that multiple CXXDefaultInitExprs don't cause an assertion failure.
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struct A { int &&r = 0; };
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struct B { A x, y; };
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B b = {}; // expected-no-diagnostics
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}
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