forked from OSchip/llvm-project
120 lines
2.1 KiB
C++
120 lines
2.1 KiB
C++
// RUN: %clang_analyze_cc1 -Wno-unused-value -std=c++14 -analyzer-checker=core,debug.ExprInspection,alpha.core.PointerArithm -verify %s
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struct X {
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int *p;
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int zero;
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void foo () {
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reset(p - 1);
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}
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void reset(int *in) {
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while (in != p) // Loop must be entered.
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zero = 1;
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}
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};
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int test (int *in) {
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X littleX;
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littleX.zero = 0;
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littleX.p = in;
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littleX.foo();
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return 5/littleX.zero; // no-warning
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}
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class Base {};
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class Derived : public Base {};
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void checkPolymorphicUse() {
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Derived d[10];
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Base *p = d;
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++p; // expected-warning{{Pointer arithmetic on a pointer to base class is dangerous}}
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}
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void checkBitCasts() {
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long l;
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char *p = (char*)&l;
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p = p+2;
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}
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void checkBasicarithmetic(int i) {
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int t[10];
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int *p = t;
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++p;
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int a = 5;
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p = &a;
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++p; // expected-warning{{Pointer arithmetic on non-array variables relies on memory layout, which is dangerous}}
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p = p + 2; // expected-warning{{}}
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p = 2 + p; // expected-warning{{}}
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p += 2; // expected-warning{{}}
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a += p[2]; // expected-warning{{}}
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p = i*0 + p;
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p = p + i*0;
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p += i*0;
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}
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void checkArithOnSymbolic(int*p) {
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++p;
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p = p + 2;
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p = 2 + p;
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p += 2;
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(void)p[2];
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}
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struct S {
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int t[10];
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};
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void arrayInStruct() {
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S s;
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int * p = s.t;
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++p;
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S *sp = new S;
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p = sp->t;
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++p;
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delete sp;
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}
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void checkNew() {
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int *p = new int;
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p[1] = 1; // expected-warning{{}}
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}
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void InitState(int* state) {
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state[1] = 1; // expected-warning{{}}
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}
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int* getArray(int size) {
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if (size == 0)
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return new int;
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return new int[5];
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}
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void checkConditionalArray() {
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int* maybeArray = getArray(0);
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InitState(maybeArray);
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}
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void checkMultiDimansionalArray() {
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int a[5][5];
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*(*(a+1)+2) = 2;
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}
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unsigned ptrSubtractionNoCrash(char *Begin, char *End) {
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auto N = End - Begin;
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if (Begin)
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return 0;
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return N;
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}
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// Bug 34309
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bool ptrAsIntegerSubtractionNoCrash(__UINTPTR_TYPE__ x, char *p) {
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__UINTPTR_TYPE__ y = (__UINTPTR_TYPE__)p - 1;
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return y == x;
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}
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// Bug 34374
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bool integerAsPtrSubtractionNoCrash(char *p, __UINTPTR_TYPE__ m) {
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auto n = p - reinterpret_cast<char*>((__UINTPTR_TYPE__)1);
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return n == m;
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}
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