f7f2e4261a
callee in constant evaluation. We previously made a deep copy of function parameters of class type when passing them, resulting in the destructor for the parameter applying to the original argument value, ignoring any modifications made in the function body. This also meant that the 'this' pointer of the function parameter could be observed changing between the caller and the callee. This change completely reimplements how we model function parameters during constant evaluation. We now model them roughly as if they were variables living in the caller, albeit with an artificially reduced scope that covers only the duration of the function call, instead of modeling them as temporaries in the caller that we partially "reparent" into the callee at the point of the call. This brings some minor diagnostic improvements, as well as significantly reduced stack usage during constant evaluation.
31 lines
1.2 KiB
C++
31 lines
1.2 KiB
C++
// RUN: %clang_cc1 -fsyntax-only -verify -std=c++11 -Wvla-extension %s
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struct StillPOD {
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StillPOD() = default;
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};
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struct StillPOD2 {
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StillPOD np;
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};
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struct NonPOD {
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NonPOD(int) {}
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};
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struct POD {
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int x;
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int y;
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};
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// We allow VLAs of POD types, only.
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void vla(int N) { // expected-note 5{{here}}
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int array1[N]; // expected-warning{{variable length arrays are a C99 feature}} expected-note {{parameter 'N'}}
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POD array2[N]; // expected-warning{{variable length arrays are a C99 feature}} expected-note {{parameter 'N'}}
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StillPOD array3[N]; // expected-warning{{variable length arrays are a C99 feature}} expected-note {{parameter 'N'}}
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StillPOD2 array4[N][3]; // expected-warning{{variable length arrays are a C99 feature}} expected-note {{parameter 'N'}}
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NonPOD array5[N]; // expected-error{{no matching constructor for initialization of 'NonPOD [N]'}}
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// expected-warning@-1{{variable length arrays are a C99 feature}} expected-note@-1 {{parameter 'N'}}
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// expected-note@-16{{candidate constructor not viable}}
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// expected-note@-18{{candidate constructor (the implicit copy constructor) not viable}}
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// expected-note@-19{{candidate constructor (the implicit move constructor) not viable}}
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}
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