161e4753b9
Memory region that correspond to a variable is identified by the variable's declaration and, in case of local variables, the stack frame it belongs to. The declaration needs to be canonical, otherwise we'd have two different memory regions that correspond to the same variable. Fix such bug for global variables with forward declarations and assert that no other problems of this kind happen. Differential Revision: https://reviews.llvm.org/D57619 llvm-svn: 353353
127 lines
2.6 KiB
C++
127 lines
2.6 KiB
C++
// RUN: %clang_analyze_cc1 -analyzer-checker=core -verify %s
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static const unsigned long long scull = 0;
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void static_int()
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{
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*(int*)scull = 0; // expected-warning{{Dereference of null pointer}}
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}
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const unsigned long long cull = 0;
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void const_int()
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{
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*(int*)cull = 0; // expected-warning{{Dereference of null pointer}}
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}
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static int * const spc = 0;
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void static_ptr()
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{
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*spc = 0; // expected-warning{{Dereference of null pointer}}
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}
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int * const pc = 0;
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void const_ptr()
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{
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*pc = 0; // expected-warning{{Dereference of null pointer}}
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}
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const unsigned long long cull_nonnull = 4;
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void nonnull_int()
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{
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*(int*)(cull_nonnull - 4) = 0; // expected-warning{{Dereference of null pointer}}
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}
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int * const pc_nonnull = (int*)sizeof(int);
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void nonnull_ptr()
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{
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*(pc_nonnull - 1) = 0; // expected-warning{{Dereference of null pointer}}
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}
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int * const constcast = const_cast<int * const>((int*)sizeof(int));
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void cast1()
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{
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*(constcast - 1) = 0; // expected-warning{{Dereference of null pointer}}
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}
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int * const recast = reinterpret_cast<int*>(sizeof(int));
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void cast2()
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{
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*(recast - 1) = 0; // expected-warning{{Dereference of null pointer}}
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}
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int * const staticcast = static_cast<int * const>((int*)sizeof(int));
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void cast3()
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{
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*(staticcast - 1) = 0; // expected-warning{{Dereference of null pointer}}
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}
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struct Foo { int a; };
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Foo * const dyncast = dynamic_cast<Foo * const>((Foo*)sizeof(Foo));
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void cast4()
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{
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// Do not handle dynamic_cast for now, because it may change the pointer value.
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(dyncast - 1)->a = 0; // no-warning
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}
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typedef int * const intptrconst;
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int * const funccast = intptrconst(sizeof(int));
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void cast5()
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{
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*(funccast - 1) = 0; // expected-warning{{Dereference of null pointer}}
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}
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struct S1
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{
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int * p;
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};
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const S1 s1 = {
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.p = (int*)sizeof(int)
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};
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void conststruct()
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{
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*(s1.p - 1) = 0; // expected-warning{{Dereference of null pointer}}
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}
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struct S2
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{
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int * const p;
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};
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S2 s2 = {
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.p = (int*)sizeof(int)
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};
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void constfield()
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{
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*(s2.p - 1) = 0; // expected-warning{{Dereference of null pointer}}
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}
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int * const parr[1] = { (int*)sizeof(int) };
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void constarr()
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{
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*(parr[0] - 1) = 0; // expected-warning{{Dereference of null pointer}}
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}
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struct S3
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{
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int * p = (int*)sizeof(int);
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};
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void recordinit()
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{
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S3 s3;
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*(s3.p - 1) = 0; // expected-warning{{Dereference of null pointer}}
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}
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extern int ext_int;
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void update_original_declaration() {
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ext_int = 2;
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}
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extern int ext_int;
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int test_redeclaration() {
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ext_int = 1;
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update_original_declaration();
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int int_int = 3 / (ext_int - 1); // no-warning
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return int_int / (ext_int - 2); // expected-warning{{Division by zero}}
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}
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