140 lines
4.6 KiB
C++
140 lines
4.6 KiB
C++
// RUN: %clang_cc1 -triple x86_64-apple-darwin -fsyntax-only -Wconversion -std=c++11 -verify %s
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// RUN: %clang_cc1 -triple x86_64-apple-darwin -fsyntax-only -Wconversion -std=c++11 %s 2>&1 | FileCheck %s
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#include <stddef.h>
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typedef signed char int8_t;
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typedef signed short int16_t;
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typedef signed int int32_t;
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typedef signed long int64_t;
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typedef unsigned char uint8_t;
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typedef unsigned short uint16_t;
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typedef unsigned int uint32_t;
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typedef unsigned long uint64_t;
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// <rdar://problem/7909130>
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namespace test0 {
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int32_t test1_positive(char *I, char *E) {
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return (E - I); // expected-warning {{implicit conversion loses integer precision}}
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}
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int32_t test1_negative(char *I, char *E) {
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return static_cast<int32_t>(E - I);
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}
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uint32_t test2_positive(uint64_t x) {
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return x; // expected-warning {{implicit conversion loses integer precision}}
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}
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uint32_t test2_negative(uint64_t x) {
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return (uint32_t) x;
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}
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}
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namespace test1 {
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uint64_t test1(int x, unsigned y) {
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return sizeof(x == y);
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}
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uint64_t test2(int x, unsigned y) {
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return __alignof(x == y);
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}
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void * const foo();
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bool test2(void *p) {
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return p == foo();
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}
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}
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namespace test2 {
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struct A {
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unsigned int x : 2;
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A() : x(10) {} // expected-warning {{implicit truncation from 'int' to bitfield changes value from 10 to 2}}
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};
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}
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// This file tests -Wnull-conversion, a subcategory of -Wconversion
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// which is on by default.
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void test3() {
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int a = NULL; // expected-warning {{implicit conversion of NULL constant to 'int'}}
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int b;
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b = NULL; // expected-warning {{implicit conversion of NULL constant to 'int'}}
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long l = NULL; // FIXME: this should also warn, but currently does not if sizeof(NULL)==sizeof(inttype)
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int c = ((((NULL)))); // expected-warning {{implicit conversion of NULL constant to 'int'}}
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int d;
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d = ((((NULL)))); // expected-warning {{implicit conversion of NULL constant to 'int'}}
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bool bl = NULL; // expected-warning {{implicit conversion of NULL constant to 'bool'}}
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char ch = NULL; // expected-warning {{implicit conversion of NULL constant to 'char'}}
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unsigned char uch = NULL; // expected-warning {{implicit conversion of NULL constant to 'unsigned char'}}
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short sh = NULL; // expected-warning {{implicit conversion of NULL constant to 'short'}}
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double dbl = NULL; // expected-warning {{implicit conversion of NULL constant to 'double'}}
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// Use FileCheck to ensure we don't get any unnecessary macro-expansion notes
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// (that don't appear as 'real' notes & can't be seen/tested by -verify)
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// CHECK-NOT: note:
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// CHECK: note: expanded from macro 'FINIT'
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#define FINIT int a3 = NULL;
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FINIT // expected-warning {{implicit conversion of NULL constant to 'int'}}
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// we don't catch the case of #define FOO NULL ... int i = FOO; but that seems a bit narrow anyway
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// and avoiding that helps us skip these cases:
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#define NULL_COND(cond) ((cond) ? &a : NULL)
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bool bl2 = NULL_COND(true); // don't warn on NULL conversion through the conditional operator across a macro boundary
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if (NULL_COND(true))
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;
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while (NULL_COND(true))
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;
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for (; NULL_COND(true); )
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;
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do ;
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while(NULL_COND(true));
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int *ip = NULL;
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int (*fp)() = NULL;
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struct foo {
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int n;
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void func();
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};
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int foo::*datamem = NULL;
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int (foo::*funmem)() = NULL;
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}
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namespace test4 {
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// FIXME: We should warn for non-dependent args (only when the param type is also non-dependent) only once
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// not once for the template + once for every instantiation
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template<typename T>
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void tmpl(char c = NULL, // expected-warning 4 {{implicit conversion of NULL constant to 'char'}}
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T a = NULL, // expected-warning {{implicit conversion of NULL constant to 'char'}} \
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expected-warning 2 {{implicit conversion of NULL constant to 'int'}}
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T b = 1024) { // expected-warning {{implicit conversion from 'int' to 'char' changes value from 1024 to 0}}
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}
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template<typename T>
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void tmpl2(T t = NULL) {
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}
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void func() {
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tmpl<char>(); // expected-note 2 {{in instantiation of default function argument expression for 'tmpl<char>' required here}}
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tmpl<int>(); // expected-note 2 {{in instantiation of default function argument expression for 'tmpl<int>' required here}}
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// FIXME: We should warn only once for each template instantiation - not once for each call
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tmpl<int>(); // expected-note 2 {{in instantiation of default function argument expression for 'tmpl<int>' required here}}
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tmpl2<int*>();
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}
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}
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namespace test5 {
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template<int I>
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void func() {
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bool b = I;
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}
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template void func<3>();
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}
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namespace test6 {
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decltype(nullptr) func() {
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return NULL;
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}
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}
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