You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
300 lines
7.3 KiB
300 lines
7.3 KiB
// RUN: %clang_cc1 -fsyntax-only -std=c++11 -Wloop-analysis -verify %s
|
|
// RUN: %clang_cc1 -fsyntax-only -std=c++11 -Wrange-loop-analysis -verify %s
|
|
|
|
template <typename return_type>
|
|
struct Iterator {
|
|
return_type operator*();
|
|
Iterator operator++();
|
|
bool operator!=(const Iterator);
|
|
};
|
|
|
|
template <typename T>
|
|
struct Container {
|
|
typedef Iterator<T> I;
|
|
|
|
I begin();
|
|
I end();
|
|
};
|
|
|
|
struct Foo {};
|
|
struct Bar {
|
|
Bar(Foo);
|
|
Bar(int);
|
|
operator int();
|
|
};
|
|
|
|
// Testing notes:
|
|
// test0 checks that the full text of the warnings and notes is correct. The
|
|
// rest of the tests checks a smaller portion of the text.
|
|
// test1-6 are set in pairs, the odd numbers are the non-reference returning
|
|
// versions of the even numbers.
|
|
// test7-9 use an array instead of a range object
|
|
// tests use all four versions of the loop varaible, const &T, const T, T&, and
|
|
// T. Versions producing errors and are commented out.
|
|
//
|
|
// Conversion chart:
|
|
// double <=> int
|
|
// int <=> Bar
|
|
// double => Bar
|
|
// Foo => Bar
|
|
//
|
|
// Conversions during tests:
|
|
// test1-2
|
|
// int => int
|
|
// int => double
|
|
// int => Bar
|
|
// test3-4
|
|
// Bar => Bar
|
|
// Bar => int
|
|
// test5-6
|
|
// Foo => Bar
|
|
// test7
|
|
// double => double
|
|
// double => int
|
|
// double => Bar
|
|
// test8
|
|
// Foo => Foo
|
|
// Foo => Bar
|
|
// test9
|
|
// Bar => Bar
|
|
// Bar => int
|
|
|
|
void test0() {
|
|
Container<int> int_non_ref_container;
|
|
Container<int&> int_container;
|
|
Container<Bar&> bar_container;
|
|
|
|
for (const int &x : int_non_ref_container) {}
|
|
// expected-warning@-1 {{loop variable 'x' is always a copy because the range of type 'Container<int>' does not return a reference}}
|
|
// expected-note@-2 {{use non-reference type 'int'}}
|
|
|
|
for (const double &x : int_container) {}
|
|
// expected-warning@-1 {{loop variable 'x' has type 'const double &' but is initialized with type 'int' resulting in a copy}}
|
|
// expected-note@-2 {{use non-reference type 'double' to keep the copy or type 'const int &' to prevent copying}}
|
|
|
|
for (const Bar x : bar_container) {}
|
|
// expected-warning@-1 {{loop variable 'x' of type 'const Bar' creates a copy from type 'const Bar'}}
|
|
// expected-note@-2 {{use reference type 'const Bar &' to prevent copying}}
|
|
}
|
|
|
|
void test1() {
|
|
Container<int> A;
|
|
|
|
for (const int &x : A) {}
|
|
// expected-warning@-1 {{always a copy}}
|
|
// expected-note@-2 {{'int'}}
|
|
for (const int x : A) {}
|
|
// No warning, non-reference type indicates copy is made
|
|
//for (int &x : A) {}
|
|
// Binding error
|
|
for (int x : A) {}
|
|
// No warning, non-reference type indicates copy is made
|
|
|
|
for (const double &x : A) {}
|
|
// expected-warning@-1 {{always a copy}}
|
|
// expected-note@-2 {{'double'}}
|
|
for (const double x : A) {}
|
|
// No warning, non-reference type indicates copy is made
|
|
//for (double &x : A) {}
|
|
// Binding error
|
|
for (double x : A) {}
|
|
// No warning, non-reference type indicates copy is made
|
|
|
|
for (const Bar &x : A) {}
|
|
// expected-warning@-1 {{always a copy}}
|
|
// expected-note@-2 {{'Bar'}}
|
|
for (const Bar x : A) {}
|
|
// No warning, non-reference type indicates copy is made
|
|
//for (Bar &x : A) {}
|
|
// Binding error
|
|
for (Bar x : A) {}
|
|
// No warning, non-reference type indicates copy is made
|
|
}
|
|
|
|
void test2() {
|
|
Container<int&> B;
|
|
|
|
for (const int &x : B) {}
|
|
// No warning, this reference is not a temporary
|
|
for (const int x : B) {}
|
|
// No warning on POD copy
|
|
for (int &x : B) {}
|
|
// No warning
|
|
for (int x : B) {}
|
|
// No warning
|
|
|
|
for (const double &x : B) {}
|
|
// expected-warning@-1 {{resulting in a copy}}
|
|
// expected-note-re@-2 {{'double'{{.*}}'const int &'}}
|
|
for (const double x : B) {}
|
|
//for (double &x : B) {}
|
|
// Binding error
|
|
for (double x : B) {}
|
|
// No warning
|
|
|
|
for (const Bar &x : B) {}
|
|
// expected-warning@-1 {{resulting in a copy}}
|
|
// expected-note@-2 {{'Bar'}}
|
|
for (const Bar x : B) {}
|
|
//for (Bar &x : B) {}
|
|
// Binding error
|
|
for (Bar x : B) {}
|
|
// No warning
|
|
}
|
|
|
|
void test3() {
|
|
Container<Bar> C;
|
|
|
|
for (const Bar &x : C) {}
|
|
// expected-warning@-1 {{always a copy}}
|
|
// expected-note@-2 {{'Bar'}}
|
|
for (const Bar x : C) {}
|
|
// No warning, non-reference type indicates copy is made
|
|
//for (Bar &x : C) {}
|
|
// Binding error
|
|
for (Bar x : C) {}
|
|
// No warning, non-reference type indicates copy is made
|
|
|
|
for (const int &x : C) {}
|
|
// expected-warning@-1 {{always a copy}}
|
|
// expected-note@-2 {{'int'}}
|
|
for (const int x : C) {}
|
|
// No warning, copy made
|
|
//for (int &x : C) {}
|
|
// Binding error
|
|
for (int x : C) {}
|
|
// No warning, copy made
|
|
}
|
|
|
|
void test4() {
|
|
Container<Bar&> D;
|
|
|
|
for (const Bar &x : D) {}
|
|
// No warning, this reference is not a temporary
|
|
for (const Bar x : D) {}
|
|
// expected-warning@-1 {{creates a copy}}
|
|
// expected-note@-2 {{'const Bar &'}}
|
|
for (Bar &x : D) {}
|
|
// No warning
|
|
for (Bar x : D) {}
|
|
// No warning
|
|
|
|
for (const int &x : D) {}
|
|
// expected-warning@-1 {{resulting in a copy}}
|
|
// expected-note-re@-2 {{'int'{{.*}}'const Bar &'}}
|
|
for (const int x : D) {}
|
|
// No warning
|
|
//for (int &x : D) {}
|
|
// Binding error
|
|
for (int x : D) {}
|
|
// No warning
|
|
}
|
|
|
|
void test5() {
|
|
Container<Foo> E;
|
|
|
|
for (const Bar &x : E) {}
|
|
// expected-warning@-1 {{always a copy}}
|
|
// expected-note@-2 {{'Bar'}}
|
|
for (const Bar x : E) {}
|
|
// No warning, non-reference type indicates copy is made
|
|
//for (Bar &x : E) {}
|
|
// Binding error
|
|
for (Bar x : E) {}
|
|
// No warning, non-reference type indicates copy is made
|
|
}
|
|
|
|
void test6() {
|
|
Container<Foo&> F;
|
|
|
|
for (const Bar &x : F) {}
|
|
// expected-warning@-1 {{resulting in a copy}}
|
|
// expected-note-re@-2 {{'Bar'{{.*}}'const Foo &'}}
|
|
for (const Bar x : F) {}
|
|
// No warning.
|
|
//for (Bar &x : F) {}
|
|
// Binding error
|
|
for (Bar x : F) {}
|
|
// No warning
|
|
}
|
|
|
|
void test7() {
|
|
double G[2];
|
|
|
|
for (const double &x : G) {}
|
|
// No warning
|
|
for (const double x : G) {}
|
|
// No warning on POD copy
|
|
for (double &x : G) {}
|
|
// No warning
|
|
for (double x : G) {}
|
|
// No warning
|
|
|
|
for (const int &x : G) {}
|
|
// expected-warning@-1 {{resulting in a copy}}
|
|
// expected-note-re@-2 {{'int'{{.*}}'const double &'}}
|
|
for (const int x : G) {}
|
|
// No warning
|
|
//for (int &x : G) {}
|
|
// Binding error
|
|
for (int x : G) {}
|
|
// No warning
|
|
|
|
for (const Bar &x : G) {}
|
|
// expected-warning@-1 {{resulting in a copy}}
|
|
// expected-note-re@-2 {{'Bar'{{.*}}'const double &'}}
|
|
for (const Bar x : G) {}
|
|
// No warning
|
|
//for (int &Bar : G) {}
|
|
// Binding error
|
|
for (int Bar : G) {}
|
|
// No warning
|
|
}
|
|
|
|
void test8() {
|
|
Foo H[2];
|
|
|
|
for (const Foo &x : H) {}
|
|
// No warning
|
|
for (const Foo x : H) {}
|
|
// No warning on POD copy
|
|
for (Foo &x : H) {}
|
|
// No warning
|
|
for (Foo x : H) {}
|
|
// No warning
|
|
|
|
for (const Bar &x : H) {}
|
|
// expected-warning@-1 {{resulting in a copy}}
|
|
// expected-note-re@-2 {{'Bar'{{.*}}'const Foo &'}}
|
|
for (const Bar x : H) {}
|
|
// No warning
|
|
//for (Bar &x: H) {}
|
|
// Binding error
|
|
for (Bar x: H) {}
|
|
// No warning
|
|
}
|
|
|
|
void test9() {
|
|
Bar I[2] = {1,2};
|
|
|
|
for (const Bar &x : I) {}
|
|
// No warning
|
|
for (const Bar x : I) {}
|
|
// expected-warning@-1 {{creates a copy}}
|
|
// expected-note@-2 {{'const Bar &'}}
|
|
for (Bar &x : I) {}
|
|
// No warning
|
|
for (Bar x : I) {}
|
|
// No warning
|
|
|
|
for (const int &x : I) {}
|
|
// expected-warning@-1 {{resulting in a copy}}
|
|
// expected-note-re@-2 {{'int'{{.*}}'const Bar &'}}
|
|
for (const int x : I) {}
|
|
// No warning
|
|
//for (int &x : I) {}
|
|
// Binding error
|
|
for (int x : I) {}
|
|
// No warning
|
|
}
|