| // RUN: %clang_cc1 %s -verify |
| // RUN: %clang_cc1 %s -DCODEGEN -emit-llvm -o - | FileCheck %s |
| |
| #define O_CREAT 0x100 |
| typedef int mode_t; |
| typedef unsigned long size_t; |
| |
| const int TRUE = 1; |
| |
| int open(const char *pathname, int flags) __attribute__((enable_if(!(flags & O_CREAT), "must specify mode when using O_CREAT"))) __attribute__((overloadable)); // expected-note{{candidate disabled: must specify mode when using O_CREAT}} |
| int open(const char *pathname, int flags, mode_t mode) __attribute__((overloadable)); // expected-note{{candidate function not viable: requires 3 arguments, but 2 were provided}} |
| |
| void test1() { |
| #ifndef CODEGEN |
| open("path", O_CREAT); // expected-error{{no matching function for call to 'open'}} |
| #endif |
| open("path", O_CREAT, 0660); |
| open("path", 0); |
| open("path", 0, 0); |
| } |
| |
| size_t __strnlen_chk(const char *s, size_t requested_amount, size_t s_len); |
| |
| size_t strnlen(const char *s, size_t maxlen) |
| __attribute__((overloadable)) |
| __asm__("strnlen_real1"); |
| |
| __attribute__((always_inline)) |
| inline size_t strnlen(const char *s, size_t maxlen) |
| __attribute__((overloadable)) |
| __attribute__((enable_if(__builtin_object_size(s, 0) != -1, |
| "chosen when target buffer size is known"))) |
| { |
| return __strnlen_chk(s, maxlen, __builtin_object_size(s, 0)); |
| } |
| |
| size_t strnlen(const char *s, size_t maxlen) |
| __attribute__((overloadable)) |
| __attribute__((enable_if(__builtin_object_size(s, 0) != -1, |
| "chosen when target buffer size is known"))) |
| __attribute__((enable_if(maxlen <= __builtin_object_size(s, 0), |
| "chosen when 'maxlen' is known to be less than or equal to the buffer size"))) |
| __asm__("strnlen_real2"); |
| |
| size_t strnlen(const char *s, size_t maxlen) // expected-note {{'strnlen' has been explicitly marked unavailable here}} |
| __attribute__((overloadable)) |
| __attribute__((enable_if(__builtin_object_size(s, 0) != -1, |
| "chosen when target buffer size is known"))) |
| __attribute__((enable_if(maxlen > __builtin_object_size(s, 0), |
| "chosen when 'maxlen' is larger than the buffer size"))) |
| __attribute__((unavailable("'maxlen' is larger than the buffer size"))); |
| |
| void test2(const char *s, int i) { |
| // CHECK: define {{.*}}void @test2 |
| const char c[123]; |
| strnlen(s, i); |
| // CHECK: call {{.*}}strnlen_real1 |
| strnlen(s, 999); |
| // CHECK: call {{.*}}strnlen_real1 |
| strnlen(c, 1); |
| // CHECK: call {{.*}}strnlen_real2 |
| strnlen(c, i); |
| // CHECK: call {{.*}}strnlen_chk |
| #ifndef CODEGEN |
| strnlen(c, 999); // expected-error{{'strnlen' is unavailable: 'maxlen' is larger than the buffer size}} |
| #endif |
| } |
| |
| int isdigit(int c) __attribute__((overloadable)); |
| int isdigit(int c) __attribute__((overloadable)) // expected-note {{'isdigit' has been explicitly marked unavailable here}} |
| __attribute__((enable_if(c <= -1 || c > 255, "'c' must have the value of an unsigned char or EOF"))) |
| __attribute__((unavailable("'c' must have the value of an unsigned char or EOF"))); |
| |
| void test3(int c) { |
| isdigit(c); // expected-warning{{ignoring return value of function declared with pure attribute}} |
| isdigit(10); // expected-warning{{ignoring return value of function declared with pure attribute}} |
| #ifndef CODEGEN |
| isdigit(-10); // expected-error{{'isdigit' is unavailable: 'c' must have the value of an unsigned char or EOF}} |
| #endif |
| } |
| |
| // Verify that the alternate spelling __enable_if__ works as well. |
| int isdigit2(int c) __attribute__((overloadable)); |
| int isdigit2(int c) __attribute__((overloadable)) // expected-note {{'isdigit2' has been explicitly marked unavailable here}} |
| __attribute__((__enable_if__(c <= -1 || c > 255, "'c' must have the value of an unsigned char or EOF"))) |
| __attribute__((unavailable("'c' must have the value of an unsigned char or EOF"))); |
| |
| void test4(int c) { |
| isdigit2(c); |
| isdigit2(10); |
| #ifndef CODEGEN |
| isdigit2(-10); // expected-error{{'isdigit2' is unavailable: 'c' must have the value of an unsigned char or EOF}} |
| #endif |
| } |
| |
| void test5() { |
| int (*p1)(int) = &isdigit2; |
| int (*p2)(int) = isdigit2; |
| void *p3 = (void *)&isdigit2; |
| void *p4 = (void *)isdigit2; |
| } |
| |
| #ifndef CODEGEN |
| __attribute__((enable_if(n == 0, "chosen when 'n' is zero"))) void f1(int n); // expected-error{{use of undeclared identifier 'n'}} |
| |
| int n __attribute__((enable_if(1, "always chosen"))); // expected-warning{{'enable_if' attribute only applies to functions}} |
| |
| void f(int n) __attribute__((enable_if("chosen when 'n' is zero", n == 0))); // expected-error{{'enable_if' attribute requires a string}} |
| |
| void f(int n) __attribute__((enable_if())); // expected-error{{'enable_if' attribute requires exactly 2 arguments}} |
| |
| void f(int n) __attribute__((enable_if(unresolvedid, "chosen when 'unresolvedid' is non-zero"))); // expected-error{{use of undeclared identifier 'unresolvedid'}} |
| |
| int global; |
| void f(int n) __attribute__((enable_if(global == 0, "chosen when 'global' is zero"))); // expected-error{{'enable_if' attribute expression never produces a constant expression}} // expected-note{{subexpression not valid in a constant expression}} |
| |
| const int cst = 7; |
| void return_cst(void) __attribute__((overloadable)) __attribute__((enable_if(cst == 7, "chosen when 'cst' is 7"))); |
| void test_return_cst() { return_cst(); } |
| |
| void f2(void) __attribute__((overloadable)) __attribute__((enable_if(1, "always chosen"))); |
| void f2(void) __attribute__((overloadable)) __attribute__((enable_if(0, "never chosen"))); |
| void f2(void) __attribute__((overloadable)) __attribute__((enable_if(TRUE, "always chosen #2"))); |
| void test6() { |
| void (*p1)(void) = &f2; // expected-error{{initializing 'void (*)(void)' with an expression of incompatible type '<overloaded function type>'}} expected-note@121{{candidate function}} expected-note@122{{candidate function made ineligible by enable_if}} expected-note@123{{candidate function}} |
| void (*p2)(void) = f2; // expected-error{{initializing 'void (*)(void)' with an expression of incompatible type '<overloaded function type>'}} expected-note@121{{candidate function}} expected-note@122{{candidate function made ineligible by enable_if}} expected-note@123{{candidate function}} |
| void *p3 = (void*)&f2; // expected-error{{address of overloaded function 'f2' is ambiguous}} expected-note@121{{candidate function}} expected-note@122{{candidate function made ineligible by enable_if}} expected-note@123{{candidate function}} |
| void *p4 = (void*)f2; // expected-error{{address of overloaded function 'f2' is ambiguous}} expected-note@121{{candidate function}} expected-note@122{{candidate function made ineligible by enable_if}} expected-note@123{{candidate function}} |
| } |
| |
| void f3(int m) __attribute__((overloadable)) __attribute__((enable_if(m >= 0, "positive"))); |
| void f3(int m) __attribute__((overloadable)) __attribute__((enable_if(m < 0, "negative"))); |
| void test7() { |
| void (*p1)(int) = &f3; // expected-error{{initializing 'void (*)(int)' with an expression of incompatible type '<overloaded function type>'}} expected-note@131{{candidate function made ineligible by enable_if}} expected-note@132{{candidate function made ineligible by enable_if}} |
| void (*p2)(int) = f3; // expected-error{{initializing 'void (*)(int)' with an expression of incompatible type '<overloaded function type>'}} expected-note@131{{candidate function made ineligible by enable_if}} expected-note@132{{candidate function made ineligible by enable_if}} |
| void *p3 = (void*)&f3; // expected-error{{address of overloaded function 'f3' does not match required type 'void'}} expected-note@131{{candidate function made ineligible by enable_if}} expected-note@132{{candidate function made ineligible by enable_if}} |
| void *p4 = (void*)f3; // expected-error{{address of overloaded function 'f3' does not match required type 'void'}} expected-note@131{{candidate function made ineligible by enable_if}} expected-note@132{{candidate function made ineligible by enable_if}} |
| } |
| |
| void f4(int m) __attribute__((enable_if(0, ""))); |
| void test8() { |
| void (*p1)(int) = &f4; // expected-error{{cannot take address of function 'f4' because it has one or more non-tautological enable_if conditions}} |
| void (*p2)(int) = f4; // expected-error{{cannot take address of function 'f4' because it has one or more non-tautological enable_if conditions}} |
| } |
| |
| void regular_enable_if(int a) __attribute__((enable_if(a, ""))); // expected-note 3{{declared here}} |
| void PR27122_ext() { |
| regular_enable_if(0, 2); // expected-error{{too many arguments}} |
| regular_enable_if(1, 2); // expected-error{{too many arguments}} |
| regular_enable_if(); // expected-error{{too few arguments}} |
| } |
| |
| // We had a bug where we'd crash upon trying to evaluate varargs. |
| void variadic_enable_if(int a, ...) __attribute__((enable_if(a, ""))); // expected-note 6 {{disabled}} |
| void variadic_test() { |
| variadic_enable_if(1); |
| variadic_enable_if(1, 2); |
| variadic_enable_if(1, "c", 3); |
| |
| variadic_enable_if(0); // expected-error{{no matching}} |
| variadic_enable_if(0, 2); // expected-error{{no matching}} |
| variadic_enable_if(0, "c", 3); // expected-error{{no matching}} |
| |
| int m; |
| variadic_enable_if(1); |
| variadic_enable_if(1, m); |
| variadic_enable_if(1, m, "c"); |
| |
| variadic_enable_if(0); // expected-error{{no matching}} |
| variadic_enable_if(0, m); // expected-error{{no matching}} |
| variadic_enable_if(0, m, 3); // expected-error{{no matching}} |
| } |
| #endif |