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[clang][Interp] Implement left and right shifts
Differential Revision: https://reviews.llvm.org/D136532
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,142 @@ | ||
| // RUN: %clang_cc1 -fexperimental-new-constant-interpreter -std=c++20 -verify %s | ||
| // RUN: %clang_cc1 -fexperimental-new-constant-interpreter -std=c++17 -verify=cxx17 %s | ||
| // RUN: %clang_cc1 -std=c++20 -verify=ref %s | ||
| // RUN: %clang_cc1 -std=c++17 -verify=ref-cxx17 %s | ||
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| #define INT_MIN (~__INT_MAX__) | ||
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| namespace shifts { | ||
| constexpr void test() { // ref-error {{constexpr function never produces a constant expression}} \ | ||
| // ref-cxx17-error {{constexpr function never produces a constant expression}} | ||
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| char c; // cxx17-warning {{uninitialized variable}} \ | ||
| // ref-cxx17-warning {{uninitialized variable}} | ||
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| c = 0 << 0; | ||
| c = 0 << 1; | ||
| c = 1 << 0; | ||
| c = 1 << -0; | ||
| c = 1 >> -0; | ||
| c = 1 << -1; // expected-warning {{shift count is negative}} \ | ||
| // cxx17-warning {{shift count is negative}} \ | ||
| // ref-warning {{shift count is negative}} \ | ||
| // ref-note {{negative shift count -1}} \ | ||
| // ref-cxx17-warning {{shift count is negative}} \ | ||
| // ref-cxx17-note {{negative shift count -1}} | ||
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| c = 1 >> -1; // expected-warning {{shift count is negative}} \ | ||
| // cxx17-warning {{shift count is negative}} \ | ||
| // ref-warning {{shift count is negative}} \ | ||
| // ref-cxx17-warning {{shift count is negative}} | ||
| c = 1 << (unsigned)-1; // expected-warning {{shift count >= width of type}} \ | ||
| // FIXME: 'implicit conversion' warning missing in the new interpreter. \ | ||
| // cxx17-warning {{shift count >= width of type}} \ | ||
| // ref-warning {{shift count >= width of type}} \ | ||
| // ref-warning {{implicit conversion}} \ | ||
| // ref-cxx17-warning {{shift count >= width of type}} \ | ||
| // ref-cxx17-warning {{implicit conversion}} | ||
| c = 1 >> (unsigned)-1; // expected-warning {{shift count >= width of type}} \ | ||
| // cxx17-warning {{shift count >= width of type}} \ | ||
| // ref-warning {{shift count >= width of type}} \ | ||
| // ref-cxx17-warning {{shift count >= width of type}} | ||
| c = 1 << c; | ||
| c <<= 0; | ||
| c >>= 0; | ||
| c <<= 1; | ||
| c >>= 1; | ||
| c <<= -1; // expected-warning {{shift count is negative}} \ | ||
| // cxx17-warning {{shift count is negative}} \ | ||
| // ref-warning {{shift count is negative}} \ | ||
| // ref-cxx17-warning {{shift count is negative}} | ||
| c >>= -1; // expected-warning {{shift count is negative}} \ | ||
| // cxx17-warning {{shift count is negative}} \ | ||
| // ref-warning {{shift count is negative}} \ | ||
| // ref-cxx17-warning {{shift count is negative}} | ||
| c <<= 999999; // expected-warning {{shift count >= width of type}} \ | ||
| // cxx17-warning {{shift count >= width of type}} \ | ||
| // ref-warning {{shift count >= width of type}} \ | ||
| // ref-cxx17-warning {{shift count >= width of type}} | ||
| c >>= 999999; // expected-warning {{shift count >= width of type}} \ | ||
| // cxx17-warning {{shift count >= width of type}} \ | ||
| // ref-warning {{shift count >= width of type}} \ | ||
| // ref-cxx17-warning {{shift count >= width of type}} | ||
| c <<= __CHAR_BIT__; // expected-warning {{shift count >= width of type}} \ | ||
| // cxx17-warning {{shift count >= width of type}} \ | ||
| // ref-warning {{shift count >= width of type}} \ | ||
| // ref-cxx17-warning {{shift count >= width of type}} | ||
| c >>= __CHAR_BIT__; // expected-warning {{shift count >= width of type}} \ | ||
| // cxx17-warning {{shift count >= width of type}} \ | ||
| // ref-warning {{shift count >= width of type}} \ | ||
| // ref-cxx17-warning {{shift count >= width of type}} | ||
| c <<= __CHAR_BIT__+1; // expected-warning {{shift count >= width of type}} \ | ||
| // cxx17-warning {{shift count >= width of type}} \ | ||
| // ref-warning {{shift count >= width of type}} \ | ||
| // ref-cxx17-warning {{shift count >= width of type}} | ||
| c >>= __CHAR_BIT__+1; // expected-warning {{shift count >= width of type}} \ | ||
| // cxx17-warning {{shift count >= width of type}} \ | ||
| // ref-warning {{shift count >= width of type}} \ | ||
| // ref-cxx17-warning {{shift count >= width of type}} | ||
| (void)((long)c << __CHAR_BIT__); | ||
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| int i; // cxx17-warning {{uninitialized variable}} \ | ||
| // ref-cxx17-warning {{uninitialized variable}} | ||
| i = 1 << (__INT_WIDTH__ - 2); | ||
| i = 2 << (__INT_WIDTH__ - 1); // cxx17-warning {{bits to represent, but 'int' only has}} \ | ||
| // ref-cxx17-warning {{bits to represent, but 'int' only has}} | ||
| i = 1 << (__INT_WIDTH__ - 1); // cxx17-warning-not {{sets the sign bit of the shift expression}} | ||
| i = -1 << (__INT_WIDTH__ - 1); // cxx17-warning {{shifting a negative signed value is undefined}} \ | ||
| // ref-cxx17-warning {{shifting a negative signed value is undefined}} | ||
| i = -1 << 0; // cxx17-warning {{shifting a negative signed value is undefined}} \ | ||
| // ref-cxx17-warning {{shifting a negative signed value is undefined}} | ||
| i = 0 << (__INT_WIDTH__ - 1); | ||
| i = (char)1 << (__INT_WIDTH__ - 2); | ||
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| unsigned u; // cxx17-warning {{uninitialized variable}} \ | ||
| // ref-cxx17-warning {{uninitialized variable}} | ||
| u = 1U << (__INT_WIDTH__ - 1); | ||
| u = 5U << (__INT_WIDTH__ - 1); | ||
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| long long int lli; // cxx17-warning {{uninitialized variable}} \ | ||
| // ref-cxx17-warning {{uninitialized variable}} | ||
| lli = INT_MIN << 2; // cxx17-warning {{shifting a negative signed value is undefined}} \ | ||
| // ref-cxx17-warning {{shifting a negative signed value is undefined}} | ||
| lli = 1LL << (sizeof(long long) * __CHAR_BIT__ - 2); | ||
| } | ||
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| static_assert(1 << 4 == 16, ""); | ||
| constexpr unsigned m = 2 >> 1; | ||
| static_assert(m == 1, ""); | ||
| constexpr unsigned char c = 0 << 8; | ||
| static_assert(c == 0, ""); | ||
| static_assert(true << 1, ""); | ||
| static_assert(1 << (__INT_WIDTH__ +1) == 0, ""); // expected-error {{not an integral constant expression}} \ | ||
| // expected-note {{>= width of type 'int'}} \ | ||
| // cxx17-error {{not an integral constant expression}} \ | ||
| // cxx17-note {{>= width of type 'int'}} \ | ||
| // ref-error {{not an integral constant expression}} \ | ||
| // ref-note {{>= width of type 'int'}} \ | ||
| // ref-cxx17-error {{not an integral constant expression}} \ | ||
| // ref-cxx17-note {{>= width of type 'int'}} | ||
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| constexpr int i1 = 1 << -1; // expected-error {{must be initialized by a constant expression}} \ | ||
| // expected-note {{negative shift count -1}} \ | ||
| // cxx17-error {{must be initialized by a constant expression}} \ | ||
| // cxx17-note {{negative shift count -1}} \ | ||
| // ref-error {{must be initialized by a constant expression}} \ | ||
| // ref-note {{negative shift count -1}} \ | ||
| // ref-cxx17-error {{must be initialized by a constant expression}} \ | ||
| // ref-cxx17-note {{negative shift count -1}} | ||
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| constexpr int i2 = 1 << (__INT_WIDTH__ + 1); // expected-error {{must be initialized by a constant expression}} \ | ||
| // expected-note {{>= width of type}} \ | ||
| // cxx17-error {{must be initialized by a constant expression}} \ | ||
| // cxx17-note {{>= width of type}} \ | ||
| // ref-error {{must be initialized by a constant expression}} \ | ||
| // ref-note {{>= width of type}} \ | ||
| // ref-cxx17-error {{must be initialized by a constant expression}} \ | ||
| // ref-cxx17-note {{>= width of type}} | ||
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| constexpr char c2 = 1; | ||
| constexpr int i3 = c2 << (__CHAR_BIT__ + 1); // Not ill-formed | ||
| }; |