1 // REQUIRES: x86-registered-target
2 // REQUIRES: nvptx-registered-target
4 // RUN: %clang_cc1 -triple x86_64-unknown-linux-gnu -fsyntax-only -verify %s
5 // RUN: %clang_cc1 -triple nvptx64-nvidia-cuda -fsyntax-only -fcuda-is-device -verify %s
7 #include "Inputs/cuda.h"
9 // Opaque return types used to check that we pick the right overloads.
10 struct HostReturnTy {};
11 struct HostReturnTy2 {};
12 struct DeviceReturnTy {};
13 struct DeviceReturnTy2 {};
14 struct HostDeviceReturnTy {};
15 struct TemplateReturnTy {};
17 typedef HostReturnTy (*HostFnPtr)();
18 typedef DeviceReturnTy (*DeviceFnPtr)();
19 typedef HostDeviceReturnTy (*HostDeviceFnPtr)();
20 typedef void (*GlobalFnPtr)(); // __global__ functions must return void.
22 // CurrentReturnTy is {HostReturnTy,DeviceReturnTy} during {host,device}
25 typedef DeviceReturnTy CurrentReturnTy;
27 typedef HostReturnTy CurrentReturnTy;
30 // CurrentFnPtr is a function pointer to a {host,device} function during
31 // {host,device} compilation.
32 typedef CurrentReturnTy (*CurrentFnPtr)();
34 // Host and unattributed functions can't be overloaded.
35 __host__ void hh() {} // expected-note {{previous definition is here}}
36 void hh() {} // expected-error {{redefinition of 'hh'}}
38 // H/D overloading is OK.
39 __host__ HostReturnTy dh() { return HostReturnTy(); }
40 __device__ DeviceReturnTy dh() { return DeviceReturnTy(); }
42 // H/HD and D/HD are not allowed.
43 __host__ __device__ int hdh() { return 0; } // expected-note {{previous definition is here}}
44 __host__ int hdh() { return 0; } // expected-error {{redefinition of 'hdh'}}
46 __host__ int hhd() { return 0; } // expected-note {{previous definition is here}}
47 __host__ __device__ int hhd() { return 0; } // expected-error {{redefinition of 'hhd'}}
48 // expected-warning@-1 {{attribute declaration must precede definition}}
49 // expected-note@-3 {{previous definition is here}}
51 __host__ __device__ int hdd() { return 0; } // expected-note {{previous definition is here}}
52 __device__ int hdd() { return 0; } // expected-error {{redefinition of 'hdd'}}
54 __device__ int dhd() { return 0; } // expected-note {{previous definition is here}}
55 __host__ __device__ int dhd() { return 0; } // expected-error {{redefinition of 'dhd'}}
56 // expected-warning@-1 {{attribute declaration must precede definition}}
57 // expected-note@-3 {{previous definition is here}}
59 // Same tests for extern "C" functions.
60 extern "C" __host__ int chh() { return 0; } // expected-note {{previous definition is here}}
61 extern "C" int chh() { return 0; } // expected-error {{redefinition of 'chh'}}
63 // H/D overloading is OK.
64 extern "C" __device__ DeviceReturnTy cdh() { return DeviceReturnTy(); }
65 extern "C" __host__ HostReturnTy cdh() { return HostReturnTy(); }
67 // H/HD and D/HD overloading is not allowed.
68 extern "C" __host__ __device__ int chhd1() { return 0; } // expected-note {{previous definition is here}}
69 extern "C" __host__ int chhd1() { return 0; } // expected-error {{redefinition of 'chhd1'}}
71 extern "C" __host__ int chhd2() { return 0; } // expected-note {{previous definition is here}}
72 extern "C" __host__ __device__ int chhd2() { return 0; } // expected-error {{redefinition of 'chhd2'}}
73 // expected-warning@-1 {{attribute declaration must precede definition}}
74 // expected-note@-3 {{previous definition is here}}
76 // Helper functions to verify calling restrictions.
77 __device__ DeviceReturnTy d() { return DeviceReturnTy(); }
78 // expected-note@-1 1+ {{'d' declared here}}
79 // expected-note@-2 1+ {{candidate function not viable: call to __device__ function from __host__ function}}
80 // expected-note@-3 0+ {{candidate function not viable: call to __device__ function from __host__ __device__ function}}
82 __host__ HostReturnTy h() { return HostReturnTy(); }
83 // expected-note@-1 1+ {{'h' declared here}}
84 // expected-note@-2 1+ {{candidate function not viable: call to __host__ function from __device__ function}}
85 // expected-note@-3 0+ {{candidate function not viable: call to __host__ function from __host__ __device__ function}}
86 // expected-note@-4 1+ {{candidate function not viable: call to __host__ function from __global__ function}}
88 __global__ void g() {}
89 // expected-note@-1 1+ {{'g' declared here}}
90 // expected-note@-2 1+ {{candidate function not viable: call to __global__ function from __device__ function}}
91 // expected-note@-3 0+ {{candidate function not viable: call to __global__ function from __host__ __device__ function}}
92 // expected-note@-4 1+ {{candidate function not viable: call to __global__ function from __global__ function}}
94 extern "C" __device__ DeviceReturnTy cd() { return DeviceReturnTy(); }
95 // expected-note@-1 1+ {{'cd' declared here}}
96 // expected-note@-2 1+ {{candidate function not viable: call to __device__ function from __host__ function}}
97 // expected-note@-3 0+ {{candidate function not viable: call to __device__ function from __host__ __device__ function}}
99 extern "C" __host__ HostReturnTy ch() { return HostReturnTy(); }
100 // expected-note@-1 1+ {{'ch' declared here}}
101 // expected-note@-2 1+ {{candidate function not viable: call to __host__ function from __device__ function}}
102 // expected-note@-3 0+ {{candidate function not viable: call to __host__ function from __host__ __device__ function}}
103 // expected-note@-4 1+ {{candidate function not viable: call to __host__ function from __global__ function}}
105 __host__ void hostf() {
106 DeviceFnPtr fp_d = d; // expected-error {{reference to __device__ function 'd' in __host__ function}}
107 DeviceReturnTy ret_d = d(); // expected-error {{no matching function for call to 'd'}}
108 DeviceFnPtr fp_cd = cd; // expected-error {{reference to __device__ function 'cd' in __host__ function}}
109 DeviceReturnTy ret_cd = cd(); // expected-error {{no matching function for call to 'cd'}}
112 HostReturnTy ret_h = h();
113 HostFnPtr fp_ch = ch;
114 HostReturnTy ret_ch = ch();
116 HostFnPtr fp_dh = dh;
117 HostReturnTy ret_dh = dh();
118 HostFnPtr fp_cdh = cdh;
119 HostReturnTy ret_cdh = cdh();
121 GlobalFnPtr fp_g = g;
122 g(); // expected-error {{call to global function g not configured}}
126 __device__ void devicef() {
127 DeviceFnPtr fp_d = d;
128 DeviceReturnTy ret_d = d();
129 DeviceFnPtr fp_cd = cd;
130 DeviceReturnTy ret_cd = cd();
132 HostFnPtr fp_h = h; // expected-error {{reference to __host__ function 'h' in __device__ function}}
133 HostReturnTy ret_h = h(); // expected-error {{no matching function for call to 'h'}}
134 HostFnPtr fp_ch = ch; // expected-error {{reference to __host__ function 'ch' in __device__ function}}
135 HostReturnTy ret_ch = ch(); // expected-error {{no matching function for call to 'ch'}}
137 DeviceFnPtr fp_dh = dh;
138 DeviceReturnTy ret_dh = dh();
139 DeviceFnPtr fp_cdh = cdh;
140 DeviceReturnTy ret_cdh = cdh();
142 GlobalFnPtr fp_g = g; // expected-error {{reference to __global__ function 'g' in __device__ function}}
143 g(); // expected-error {{no matching function for call to 'g'}}
144 g<<<0,0>>>(); // expected-error {{reference to __global__ function 'g' in __device__ function}}
147 __global__ void globalf() {
148 DeviceFnPtr fp_d = d;
149 DeviceReturnTy ret_d = d();
150 DeviceFnPtr fp_cd = cd;
151 DeviceReturnTy ret_cd = cd();
153 HostFnPtr fp_h = h; // expected-error {{reference to __host__ function 'h' in __global__ function}}
154 HostReturnTy ret_h = h(); // expected-error {{no matching function for call to 'h'}}
155 HostFnPtr fp_ch = ch; // expected-error {{reference to __host__ function 'ch' in __global__ function}}
156 HostReturnTy ret_ch = ch(); // expected-error {{no matching function for call to 'ch'}}
158 DeviceFnPtr fp_dh = dh;
159 DeviceReturnTy ret_dh = dh();
160 DeviceFnPtr fp_cdh = cdh;
161 DeviceReturnTy ret_cdh = cdh();
163 GlobalFnPtr fp_g = g; // expected-error {{reference to __global__ function 'g' in __global__ function}}
164 g(); // expected-error {{no matching function for call to 'g'}}
165 g<<<0,0>>>(); // expected-error {{reference to __global__ function 'g' in __global__ function}}
168 __host__ __device__ void hostdevicef() {
169 DeviceFnPtr fp_d = d;
170 DeviceReturnTy ret_d = d();
171 DeviceFnPtr fp_cd = cd;
172 DeviceReturnTy ret_cd = cd();
175 HostReturnTy ret_h = h();
176 HostFnPtr fp_ch = ch;
177 HostReturnTy ret_ch = ch();
179 CurrentFnPtr fp_dh = dh;
180 CurrentReturnTy ret_dh = dh();
181 CurrentFnPtr fp_cdh = cdh;
182 CurrentReturnTy ret_cdh = cdh();
184 GlobalFnPtr fp_g = g;
185 #if defined(__CUDA_ARCH__)
186 // expected-error@-2 {{reference to __global__ function 'g' in __host__ __device__ function}}
190 #if !defined(__CUDA_ARCH__)
191 // expected-error@-3 {{call to global function g not configured}}
193 // expected-error@-5 {{no matching function for call to 'g'}}
194 // expected-error@-5 {{reference to __global__ function 'g' in __host__ __device__ function}}
195 #endif // __CUDA_ARCH__
198 // Test for address of overloaded function resolution in the global context.
200 HostFnPtr fp_ch = ch;
201 CurrentFnPtr fp_dh = dh;
202 CurrentFnPtr fp_cdh = cdh;
203 GlobalFnPtr fp_g = g;
206 // Test overloading of destructors
207 // Can't mix H and unattributed destructors
209 ~d_h() {} // expected-note {{previous declaration is here}}
210 __host__ ~d_h() {} // expected-error {{destructor cannot be redeclared}}
213 // H/D overloading is OK
215 __device__ ~d_dh() {}
221 __host__ __device__ ~d_hd() {}
224 // Mixing H/D and HD is not allowed.
226 __device__ ~d_dhhd() {}
227 __host__ ~d_dhhd() {} // expected-note {{previous declaration is here}}
228 __host__ __device__ ~d_dhhd() {} // expected-error {{destructor cannot be redeclared}}
232 __host__ ~d_hhd() {} // expected-note {{previous declaration is here}}
233 __host__ __device__ ~d_hhd() {} // expected-error {{destructor cannot be redeclared}}
237 __host__ __device__ ~d_hdh() {} // expected-note {{previous declaration is here}}
238 __host__ ~d_hdh() {} // expected-error {{destructor cannot be redeclared}}
242 __device__ ~d_dhd() {} // expected-note {{previous declaration is here}}
243 __host__ __device__ ~d_dhd() {} // expected-error {{destructor cannot be redeclared}}
247 __host__ __device__ ~d_hdd() {} // expected-note {{previous declaration is here}}
248 __device__ ~d_hdd() {} // expected-error {{destructor cannot be redeclared}}
251 // Test overloading of member functions
253 void operator delete(void *ptr); // expected-note {{previous declaration is here}}
254 __host__ void operator delete(void *ptr); // expected-error {{class member cannot be redeclared}}
257 // D/H overloading is OK
259 __device__ void operator delete(void *ptr);
260 __host__ void operator delete(void *ptr);
263 // HD by itself is OK
265 __device__ __host__ void operator delete(void *ptr);
269 __host__ void operator delete(void *ptr) {} // expected-note {{previous declaration is here}}
270 __host__ __device__ void operator delete(void *ptr) {} // expected-error {{class member cannot be redeclared}}
274 __host__ __device__ void operator delete(void *ptr) {} // expected-note {{previous declaration is here}}
275 __host__ void operator delete(void *ptr) {} // expected-error {{class member cannot be redeclared}}
279 __device__ void operator delete(void *ptr) {} // expected-note {{previous declaration is here}}
280 __host__ __device__ void operator delete(void *ptr) {} // expected-error {{class member cannot be redeclared}}
284 __host__ __device__ void operator delete(void *ptr) {} // expected-note {{previous declaration is here}}
285 __device__ void operator delete(void *ptr) {} // expected-error {{class member cannot be redeclared}}
288 // __global__ functions can't be overloaded based on attribute
291 friend void friend_of_g(G &arg);
295 __global__ void friend_of_g(G &arg) { int x = arg.x; } // expected-note {{previous definition is here}}
296 void friend_of_g(G &arg) { int x = arg.x; } // expected-error {{redefinition of 'friend_of_g'}}
298 // HD functions are sometimes allowed to call H or D functions -- this
299 // is an artifact of the source-to-source splitting performed by nvcc
300 // that we need to mimic. During device mode compilation in nvcc, host
301 // functions aren't present at all, so don't participate in
302 // overloading. But in clang, H and D functions are present in both
303 // compilation modes. Clang normally uses the target attribute as a
304 // tiebreaker between overloads with otherwise identical priority, but
305 // in order to match nvcc's behavior, we sometimes need to wholly
306 // discard overloads that would not be present during compilation
309 template <typename T> TemplateReturnTy template_vs_function(T arg) {
310 return TemplateReturnTy();
312 __device__ DeviceReturnTy template_vs_function(float arg) {
313 return DeviceReturnTy();
316 // Here we expect to call the templated function during host compilation, even
317 // if -fcuda-disable-target-call-checks is passed, and even though C++ overload
318 // rules prefer the non-templated function.
319 __host__ __device__ void test_host_device_calls_template(void) {
321 typedef DeviceReturnTy ExpectedReturnTy;
323 typedef TemplateReturnTy ExpectedReturnTy;
326 ExpectedReturnTy ret1 = template_vs_function(1.0f);
327 ExpectedReturnTy ret2 = template_vs_function(2.0);
330 // Calls from __host__ and __device__ functions should always call the
331 // overloaded function that matches their mode.
332 __host__ void test_host_calls_template_fn() {
333 TemplateReturnTy ret1 = template_vs_function(1.0f);
334 TemplateReturnTy ret2 = template_vs_function(2.0);
337 __device__ void test_device_calls_template_fn() {
338 DeviceReturnTy ret1 = template_vs_function(1.0f);
339 DeviceReturnTy ret2 = template_vs_function(2.0);
342 // If we have a mix of HD and H-only or D-only candidates in the overload set,
343 // normal C++ overload resolution rules apply first.
344 template <typename T> TemplateReturnTy template_vs_hd_function(T arg) {
345 return TemplateReturnTy();
347 __host__ __device__ HostDeviceReturnTy template_vs_hd_function(float arg) {
348 return HostDeviceReturnTy();
351 __host__ __device__ void test_host_device_calls_hd_template() {
352 HostDeviceReturnTy ret1 = template_vs_hd_function(1.0f);
353 TemplateReturnTy ret2 = template_vs_hd_function(1);
356 __host__ void test_host_calls_hd_template() {
357 HostDeviceReturnTy ret1 = template_vs_hd_function(1.0f);
358 TemplateReturnTy ret2 = template_vs_hd_function(1);
361 __device__ void test_device_calls_hd_template() {
362 HostDeviceReturnTy ret1 = template_vs_hd_function(1.0f);
363 // Host-only function template is not callable with strict call checks,
364 // so for device side HD function will be the only choice.
365 HostDeviceReturnTy ret2 = template_vs_hd_function(1);
368 // Check that overloads still work the same way on both host and
369 // device side when the overload set contains only functions from one
370 // side of compilation.
371 __device__ DeviceReturnTy device_only_function(int arg) { return DeviceReturnTy(); }
372 __device__ DeviceReturnTy2 device_only_function(float arg) { return DeviceReturnTy2(); }
373 __host__ HostReturnTy host_only_function(int arg) { return HostReturnTy(); }
374 __host__ HostReturnTy2 host_only_function(float arg) { return HostReturnTy2(); }
376 __host__ __device__ void test_host_device_single_side_overloading() {
377 DeviceReturnTy ret1 = device_only_function(1);
378 DeviceReturnTy2 ret2 = device_only_function(1.0f);
379 HostReturnTy ret3 = host_only_function(1);
380 HostReturnTy2 ret4 = host_only_function(1.0f);
383 // Verify that we allow overloading function templates.
384 template <typename T> __host__ T template_overload(const T &a) { return a; };
385 template <typename T> __device__ T template_overload(const T &a) { return a; };
387 __host__ void test_host_template_overload() {
388 template_overload(1); // OK. Attribute-based overloading picks __host__ variant.
390 __device__ void test_device_template_overload() {
391 template_overload(1); // OK. Attribute-based overloading picks __device__ variant.