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.
49 lines
1.4 KiB
C++
49 lines
1.4 KiB
C++
// RUN: %clang_cc1 -triple x86_64-unknown-linux-gnu -fcxx-exceptions -fexceptions -O0 -verify %s
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// RUN: %clang_cc1 -triple x86_64-unknown-linux-gnu -fcxx-exceptions -fexceptions -pedantic-errors -DPE -O0 -verify %s
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# ifndef PE
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// expected-no-diagnostics
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# endif
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extern "C" int printf(const char*, ...);
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static int N;
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struct S {
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S() __attribute__ ((nothrow)) { printf("%d: S()\n", ++N); }
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~S() __attribute__ ((nothrow)) { printf("%d: ~S()\n", N--); }
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int n[17];
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};
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void print(int n, int a, int b, int c, int d) {
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printf("n=%d\n,sizeof(S)=%d\nsizeof(array_t[0][0])=%d\nsizeof(array_t[0])=%d\nsizeof(array_t)=%d\n",
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n, a, b, c, d);
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if (n == 2) throw(n);
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}
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void test(int n) {
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S array_t[n][n+1];
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# ifdef PE
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// expected-error@-2 {{variable length arrays are a C99 feature}} expected-note@-2 {{parameter}} expected-note@-3 {{here}}
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// expected-error@-3 {{variable length arrays are a C99 feature}} expected-note@-3 {{parameter}} expected-note@-4 {{here}}
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# endif
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int sizeof_S = sizeof(S);
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int sizeof_array_t_0_0 = sizeof(array_t[0][0]);
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int sizeof_array_t_0 = sizeof(array_t[0]);
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int sizeof_array_t = sizeof(array_t);
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print(n, sizeof_S, sizeof_array_t_0_0, sizeof_array_t_0, sizeof_array_t);
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}
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int main()
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{
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try {
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test(2);
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} catch(int e) {
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printf("exception %d\n", e);
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}
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try {
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test(3);
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} catch(int e) {
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printf("exception %d", e);
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}
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}
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