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