165 lines
4.3 KiB
C++
165 lines
4.3 KiB
C++
// RUN: grep -Ev "// *[A-Z-]+:" %s > %t.cpp
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// RUN: clang-modernize -use-nullptr %t.cpp -- -I %S
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// RUN: FileCheck -input-file=%t.cpp %s
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// RUN: grep -Ev "// *[A-Z-]+:" %s > %t2.cpp
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// RUN: clang-modernize -use-nullptr -user-null-macros=MY_NULL %t2.cpp -- -I %S
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// RUN: FileCheck -check-prefix=USER-SUPPLIED-NULL -input-file=%t2.cpp %s
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#define NULL 0
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// CHECK: #define NULL 0
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void dummy(int*) {}
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void side_effect() {}
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#define MACRO_EXPANSION_HAS_NULL \
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void foo() { \
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dummy(0); \
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dummy(NULL); \
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side_effect(); \
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}
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// CHECK: void foo() { \
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// CHECK-NEXT: dummy(0); \
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// CHECK-NEXT: dummy(NULL); \
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MACRO_EXPANSION_HAS_NULL;
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// CHECK: MACRO_EXPANSION_HAS_NULL;
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#undef MACRO_EXPANSION_HAS_NULL
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void test_macro_expansion1() {
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#define MACRO_EXPANSION_HAS_NULL \
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dummy(NULL); \
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side_effect();
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// CHECK: dummy(NULL); \
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// CHECK-NEXT: side_effect();
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MACRO_EXPANSION_HAS_NULL;
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// CHECK: MACRO_EXPANSION_HAS_NULL;
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#undef MACRO_EXPANSION_HAS_NULL
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}
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// Test macro expansion with cast sequence, PR15572
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void test_macro_expansion2() {
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#define MACRO_EXPANSION_HAS_NULL \
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dummy((int*)0); \
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side_effect();
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// CHECK: dummy((int*)0); \
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// CHECK-NEXT: side_effect();
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MACRO_EXPANSION_HAS_NULL;
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// CHECK: MACRO_EXPANSION_HAS_NULL;
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#undef MACRO_EXPANSION_HAS_NULL
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}
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void test_macro_expansion3() {
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#define MACRO_EXPANSION_HAS_NULL \
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dummy(NULL); \
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side_effect();
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// CHECK: dummy(NULL); \
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// CHECK-NEXT: side_effect();
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#define OUTER_MACRO \
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MACRO_EXPANSION_HAS_NULL; \
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side_effect();
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OUTER_MACRO;
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// CHECK: OUTER_MACRO;
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#undef OUTER_MACRO
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#undef MACRO_EXPANSION_HAS_NULL
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}
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void test_macro_expansion4() {
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#define MY_NULL NULL
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int *p = MY_NULL;
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// CHECK: int *p = MY_NULL;
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// USER-SUPPLIED-NULL: int *p = nullptr;
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#undef MY_NULL
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}
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#define IS_EQ(x, y) if (x != y) return;
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void test_macro_args() {
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int i = 0;
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int *Ptr;
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IS_EQ(static_cast<int*>(0), Ptr);
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// CHECK: IS_EQ(static_cast<int*>(nullptr), Ptr);
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IS_EQ(0, Ptr); // literal
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// CHECK: IS_EQ(nullptr, Ptr);
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IS_EQ(NULL, Ptr); // macro
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// CHECK: IS_EQ(nullptr, Ptr);
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// These are ok since the null literal is not spelled within a macro.
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#define myassert(x) if (!(x)) return;
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myassert(0 == Ptr);
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// CHECK: myassert(nullptr == Ptr);
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myassert(NULL == Ptr);
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// CHECK: myassert(nullptr == Ptr);
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// These are bad as the null literal is buried in a macro.
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#define BLAH(X) myassert(0 == (X));
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// CHECK: #define BLAH(X) myassert(0 == (X));
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#define BLAH2(X) myassert(NULL == (X));
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// CHECK: #define BLAH2(X) myassert(NULL == (X));
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BLAH(Ptr);
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// CHECK: BLAH(Ptr);
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BLAH2(Ptr);
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// CHECK: BLAH2(Ptr);
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// Same as above but testing extra macro expansion.
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#define EXPECT_NULL(X) IS_EQ(0, X);
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// CHECK: #define EXPECT_NULL(X) IS_EQ(0, X);
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#define EXPECT_NULL2(X) IS_EQ(NULL, X);
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// CHECK: #define EXPECT_NULL2(X) IS_EQ(NULL, X);
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EXPECT_NULL(Ptr);
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// CHECK: EXPECT_NULL(Ptr);
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EXPECT_NULL2(Ptr);
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// CHECK: EXPECT_NULL2(Ptr);
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// Almost the same as above but now null literal is not in a macro so ok
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// to transform.
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#define EQUALS_PTR(X) IS_EQ(X, Ptr);
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EQUALS_PTR(0);
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EQUALS_PTR(NULL);
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// Same as above but testing extra macro expansion.
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#define EQUALS_PTR_I(X) EQUALS_PTR(X)
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EQUALS_PTR_I(0);
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// CHECK: EQUALS_PTR_I(nullptr);
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EQUALS_PTR_I(NULL);
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// CHECK: EQUALS_PTR_I(nullptr);
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// Ok since null literal not within macro. However, now testing macro
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// used as arg to another macro.
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#define decorate(EXPR) side_effect(); EXPR;
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decorate(IS_EQ(NULL, Ptr));
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// CHECK: decorate(IS_EQ(nullptr, Ptr));
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decorate(IS_EQ(0, Ptr));
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// CHECK: decorate(IS_EQ(nullptr, Ptr));
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// This macro causes a NullToPointer cast to happen where 0 is assigned to z
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// but the 0 literal cannot be replaced because it is also used as an
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// integer in the comparison.
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#define INT_AND_PTR_USE(X) do { int *z = X; if (X == 4) break; } while(false)
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INT_AND_PTR_USE(0);
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// CHECK: INT_AND_PTR_USE(0);
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// Both uses of X in this case result in NullToPointer casts so replacement
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// is possible.
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#define PTR_AND_PTR_USE(X) do { int *z = X; if (X != z) break; } while(false)
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PTR_AND_PTR_USE(0);
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// CHECK: PTR_AND_PTR_USE(nullptr);
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PTR_AND_PTR_USE(NULL);
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// CHECK: PTR_AND_PTR_USE(nullptr);
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#define OPTIONAL_CODE(...) __VA_ARGS__
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#define NOT_NULL dummy(0)
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#define CALL(X) X
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OPTIONAL_CODE(NOT_NULL);
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// CHECK: OPTIONAL_CODE(NOT_NULL);
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CALL(NOT_NULL);
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// CHECK: CALL(NOT_NULL);
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}
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