191 lines
11 KiB
C++
191 lines
11 KiB
C++
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// RUN: %clang_cc1 -fexperimental-new-constant-interpreter -std=c++20 -verify %s
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// RUN: %clang_cc1 -fexperimental-new-constant-interpreter -std=c++17 -verify=cxx17 %s
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// RUN: %clang_cc1 -std=c++20 -verify=ref %s
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// 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 {
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constexpr void test() { // ref-error {{constexpr function never produces a constant expression}} \
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// ref-cxx17-error {{constexpr function never produces a constant expression}} \
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// expected-error {{constexpr function never produces a constant expression}} \
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// cxx17-error {{constexpr function never produces a constant expression}} \
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char c; // cxx17-warning {{uninitialized variable}} \
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// ref-cxx17-warning {{uninitialized variable}}
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c = 0 << 0;
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c = 0 << 1;
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c = 1 << 0;
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c = 1 << -0;
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c = 1 >> -0;
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c = 1 << -1; // expected-warning {{shift count is negative}} \
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// expected-note {{negative shift count -1}} \
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// cxx17-note {{negative shift count -1}} \
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// cxx17-warning {{shift count is negative}} \
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// ref-warning {{shift count is negative}} \
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// ref-note {{negative shift count -1}} \
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// ref-cxx17-warning {{shift count is negative}} \
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// ref-cxx17-note {{negative shift count -1}}
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c = 1 >> -1; // expected-warning {{shift count is negative}} \
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// cxx17-warning {{shift count is negative}} \
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// ref-warning {{shift count is negative}} \
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// ref-cxx17-warning {{shift count is negative}}
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c = 1 << (unsigned)-1; // expected-warning {{shift count >= width of type}} \
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// FIXME: 'implicit conversion' warning missing in the new interpreter. \
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// cxx17-warning {{shift count >= width of type}} \
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// ref-warning {{shift count >= width of type}} \
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// ref-warning {{implicit conversion}} \
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// ref-cxx17-warning {{shift count >= width of type}} \
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// ref-cxx17-warning {{implicit conversion}}
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c = 1 >> (unsigned)-1; // expected-warning {{shift count >= width of type}} \
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// cxx17-warning {{shift count >= width of type}} \
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// ref-warning {{shift count >= width of type}} \
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// ref-cxx17-warning {{shift count >= width of type}}
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c = 1 << c;
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c <<= 0;
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c >>= 0;
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c <<= 1;
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c >>= 1;
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c <<= -1; // expected-warning {{shift count is negative}} \
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// cxx17-warning {{shift count is negative}} \
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// ref-warning {{shift count is negative}} \
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// ref-cxx17-warning {{shift count is negative}}
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c >>= -1; // expected-warning {{shift count is negative}} \
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// cxx17-warning {{shift count is negative}} \
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// ref-warning {{shift count is negative}} \
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// ref-cxx17-warning {{shift count is negative}}
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c <<= 999999; // expected-warning {{shift count >= width of type}} \
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// cxx17-warning {{shift count >= width of type}} \
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// ref-warning {{shift count >= width of type}} \
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// ref-cxx17-warning {{shift count >= width of type}}
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c >>= 999999; // expected-warning {{shift count >= width of type}} \
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// cxx17-warning {{shift count >= width of type}} \
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// ref-warning {{shift count >= width of type}} \
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// ref-cxx17-warning {{shift count >= width of type}}
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c <<= __CHAR_BIT__; // expected-warning {{shift count >= width of type}} \
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// cxx17-warning {{shift count >= width of type}} \
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// ref-warning {{shift count >= width of type}} \
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// ref-cxx17-warning {{shift count >= width of type}}
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c >>= __CHAR_BIT__; // expected-warning {{shift count >= width of type}} \
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// cxx17-warning {{shift count >= width of type}} \
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// ref-warning {{shift count >= width of type}} \
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// ref-cxx17-warning {{shift count >= width of type}}
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c <<= __CHAR_BIT__+1; // expected-warning {{shift count >= width of type}} \
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// cxx17-warning {{shift count >= width of type}} \
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// ref-warning {{shift count >= width of type}} \
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// ref-cxx17-warning {{shift count >= width of type}}
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c >>= __CHAR_BIT__+1; // expected-warning {{shift count >= width of type}} \
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// cxx17-warning {{shift count >= width of type}} \
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// ref-warning {{shift count >= width of type}} \
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// ref-cxx17-warning {{shift count >= width of type}}
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(void)((long)c << __CHAR_BIT__);
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int i; // cxx17-warning {{uninitialized variable}} \
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// ref-cxx17-warning {{uninitialized variable}}
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i = 1 << (__INT_WIDTH__ - 2);
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i = 2 << (__INT_WIDTH__ - 1); // cxx17-warning {{bits to represent, but 'int' only has}} \
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// ref-cxx17-warning {{bits to represent, but 'int' only has}}
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i = 1 << (__INT_WIDTH__ - 1); // cxx17-warning-not {{sets the sign bit of the shift expression}}
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i = -1 << (__INT_WIDTH__ - 1); // cxx17-warning {{shifting a negative signed value is undefined}} \
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// ref-cxx17-warning {{shifting a negative signed value is undefined}}
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i = -1 << 0; // cxx17-warning {{shifting a negative signed value is undefined}} \
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// ref-cxx17-warning {{shifting a negative signed value is undefined}}
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i = 0 << (__INT_WIDTH__ - 1);
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i = (char)1 << (__INT_WIDTH__ - 2);
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unsigned u; // cxx17-warning {{uninitialized variable}} \
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// ref-cxx17-warning {{uninitialized variable}}
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u = 1U << (__INT_WIDTH__ - 1);
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u = 5U << (__INT_WIDTH__ - 1);
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long long int lli; // cxx17-warning {{uninitialized variable}} \
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// ref-cxx17-warning {{uninitialized variable}}
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lli = INT_MIN << 2; // cxx17-warning {{shifting a negative signed value is undefined}} \
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// ref-cxx17-warning {{shifting a negative signed value is undefined}}
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lli = 1LL << (sizeof(long long) * __CHAR_BIT__ - 2);
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}
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static_assert(1 << 4 == 16, "");
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constexpr unsigned m = 2 >> 1;
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static_assert(m == 1, "");
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constexpr unsigned char c = 0 << 8;
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static_assert(c == 0, "");
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static_assert(true << 1, "");
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static_assert(1 << (__INT_WIDTH__ +1) == 0, ""); // expected-error {{not an integral constant expression}} \
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// expected-note {{>= width of type 'int'}} \
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// cxx17-error {{not an integral constant expression}} \
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// cxx17-note {{>= width of type 'int'}} \
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// ref-error {{not an integral constant expression}} \
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// ref-note {{>= width of type 'int'}} \
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// ref-cxx17-error {{not an integral constant expression}} \
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// 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}} \
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// expected-note {{negative shift count -1}} \
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// cxx17-error {{must be initialized by a constant expression}} \
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// cxx17-note {{negative shift count -1}} \
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// ref-error {{must be initialized by a constant expression}} \
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// ref-note {{negative shift count -1}} \
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// ref-cxx17-error {{must be initialized by a constant expression}} \
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// 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}} \
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// expected-note {{>= width of type}} \
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// cxx17-error {{must be initialized by a constant expression}} \
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// cxx17-note {{>= width of type}} \
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// ref-error {{must be initialized by a constant expression}} \
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// ref-note {{>= width of type}} \
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// ref-cxx17-error {{must be initialized by a constant expression}} \
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// ref-cxx17-note {{>= width of type}}
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constexpr char c2 = 1;
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constexpr int i3 = c2 << (__CHAR_BIT__ + 1); // Not ill-formed
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/// The purpose of these few lines is to test that we can shift more bits
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/// than an unsigned *of the host* has. There was a bug where we casted
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/// to host-unsigned. However, we cannot query what a host-unsigned even is
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/// here, so only test this on platforms where `sizeof(long long) > sizeof(unsigned)`.
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constexpr long long int L = 1;
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constexpr signed int R = (sizeof(unsigned) * 8) + 1;
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constexpr decltype(L) M = (R > 32 && R < 64) ? L << R : 0;
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constexpr decltype(L) M2 = (R > 32 && R < 64) ? L >> R : 0;
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constexpr int signedShift() { // cxx17-error {{never produces a constant expression}} \
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// ref-cxx17-error {{never produces a constant expression}}
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return 1024 << 31; // cxx17-warning {{signed shift result}} \
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// ref-cxx17-warning {{signed shift result}} \
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// cxx17-note {{signed left shift discards bits}} \
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// ref-cxx17-note {{signed left shift discards bits}}
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}
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constexpr int negativeShift() { // cxx17-error {{never produces a constant expression}} \
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// ref-cxx17-error {{never produces a constant expression}}
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return -1 << 2; // cxx17-warning {{shifting a negative signed value is undefined}} \
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// ref-cxx17-warning {{shifting a negative signed value is undefined}} \
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// cxx17-note {{left shift of negative value -1}} \
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// ref-cxx17-note {{left shift of negative value -1}}
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}
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constexpr int foo(int a) {
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return -a << 2; // cxx17-note {{left shift of negative value -10}} \
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// ref-cxx17-note {{left shift of negative value -10}} \
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// cxx17-note {{left shift of negative value -2}} \
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// ref-cxx17-note {{left shift of negative value -2}}
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}
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static_assert(foo(10)); // cxx17-error {{not an integral constant expression}} \
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// cxx17-note {{in call to 'foo(10)'}} \
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// ref-cxx17-error {{not an integral constant expression}} \
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// ref-cxx17-note {{in call to 'foo(10)'}}
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constexpr int a = -2;
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static_assert(foo(a));
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static_assert(foo(-a)); // cxx17-error {{not an integral constant expression}} \
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// cxx17-note {{in call to 'foo(2)'}} \
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// ref-cxx17-error {{not an integral constant expression}} \
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// ref-cxx17-note {{in call to 'foo(2)'}}
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};
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