llvm-capstone/clang/test/SemaCUDA/constexpr-variables.cu
Richard Smith f7f2e4261a PR47805: Use a single object for a function parameter in the caller and
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.
2020-10-14 17:43:51 -07:00

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// RUN: %clang_cc1 -std=c++14 %s -emit-llvm -o - -triple nvptx64-nvidia-cuda \
// RUN: -fcuda-is-device -verify -fsyntax-only
// RUN: %clang_cc1 -std=c++17 %s -emit-llvm -o - -triple nvptx64-nvidia-cuda \
// RUN: -fcuda-is-device -verify -fsyntax-only
// RUN: %clang_cc1 -std=c++14 %s -emit-llvm -o - \
// RUN: -triple x86_64-unknown-linux-gnu -verify -fsyntax-only
// RUN: %clang_cc1 -std=c++17 %s -emit-llvm -o - \
// RUN: -triple x86_64-unknown-linux-gnu -verify -fsyntax-only
#include "Inputs/cuda.h"
template<typename T>
__host__ __device__ void foo(const T **a) {
// expected-note@-1 {{declared here}}
static const T b = sizeof(a);
static constexpr T c = sizeof(a);
const T d = sizeof(a);
constexpr T e = sizeof(a);
constexpr T f = **a;
// expected-error@-1 {{constexpr variable 'f' must be initialized by a constant expression}}
// expected-note@-2 {{}}
a[0] = &b;
a[1] = &c;
a[2] = &d;
a[3] = &e;
}
__device__ void device_fun(const int **a) {
// expected-note@-1 {{declared here}}
constexpr int b = sizeof(a);
static constexpr int c = sizeof(a);
constexpr int d = **a;
// expected-error@-1 {{constexpr variable 'd' must be initialized by a constant expression}}
// expected-note@-2 {{}}
a[0] = &b;
a[1] = &c;
foo(a);
// expected-note@-1 {{in instantiation of function template specialization 'foo<int>' requested here}}
}
void host_fun(const int **a) {
// expected-note@-1 {{declared here}}
constexpr int b = sizeof(a);
static constexpr int c = sizeof(a);
constexpr int d = **a;
// expected-error@-1 {{constexpr variable 'd' must be initialized by a constant expression}}
// expected-note@-2 {{}}
a[0] = &b;
a[1] = &c;
foo(a);
}
__host__ __device__ void host_device_fun(const int **a) {
// expected-note@-1 {{declared here}}
constexpr int b = sizeof(a);
static constexpr int c = sizeof(a);
constexpr int d = **a;
// expected-error@-1 {{constexpr variable 'd' must be initialized by a constant expression}}
// expected-note@-2 {{}}
a[0] = &b;
a[1] = &c;
foo(a);
}
template <class T>
struct A {
explicit A() = default;
};
template <class T>
constexpr A<T> a{};
struct B {
static constexpr bool value = true;
};
template<typename T>
struct C {
static constexpr bool value = T::value;
};
__constant__ const bool &x = C<B>::value;