forked from OSchip/llvm-project
101 lines
2.3 KiB
C++
101 lines
2.3 KiB
C++
// RUN: %clang_cc1 -analyze -analyzer-checker=core,unix.Malloc,debug.ExprInspection -analyzer-store region -std=c++11 -verify %s
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void clang_analyzer_eval(bool);
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typedef __typeof__(sizeof(int)) size_t;
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extern "C" void *malloc(size_t);
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int someGlobal;
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void testImplicitlyDeclaredGlobalNew() {
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if (someGlobal != 0)
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return;
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// This used to crash because the global operator new is being implicitly
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// declared and it does not have a valid source location. (PR13090)
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void *x = ::operator new(0);
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::operator delete(x);
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// Check that the new/delete did not invalidate someGlobal;
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clang_analyzer_eval(someGlobal == 0); // expected-warning{{TRUE}}
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}
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// This is the standard placement new.
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inline void* operator new(size_t, void* __p) throw()
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{
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return __p;
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}
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void *testPlacementNew() {
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int *x = (int *)malloc(sizeof(int));
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*x = 1;
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clang_analyzer_eval(*x == 1); // expected-warning{{TRUE}};
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void *y = new (x) int;
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clang_analyzer_eval(x == y); // expected-warning{{TRUE}};
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clang_analyzer_eval(*x == 1); // expected-warning{{UNKNOWN}};
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return y;
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}
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void *operator new(size_t, size_t, int *);
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void *testCustomNew() {
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int x[1] = {1};
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clang_analyzer_eval(*x == 1); // expected-warning{{TRUE}};
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void *y = new (0, x) int;
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clang_analyzer_eval(*x == 1); // expected-warning{{UNKNOWN}};
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return y; // no-warning
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}
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void *operator new(size_t, void *, void *);
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void *testCustomNewMalloc() {
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int *x = (int *)malloc(sizeof(int));
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// Should be no-warning (the custom allocator could have freed x).
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void *y = new (0, x) int; // no-warning
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return y;
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}
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void testScalarInitialization() {
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int *n = new int(3);
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clang_analyzer_eval(*n == 3); // expected-warning{{TRUE}}
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new (n) int();
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clang_analyzer_eval(*n == 0); // expected-warning{{TRUE}}
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new (n) int{3};
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clang_analyzer_eval(*n == 3); // expected-warning{{TRUE}}
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new (n) int{};
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clang_analyzer_eval(*n == 0); // expected-warning{{TRUE}}
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}
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//--------------------------------
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// Incorrectly-modelled behavior
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//--------------------------------
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int testNoInitialization() {
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int *n = new int;
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// Should warn that *n is uninitialized.
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if (*n) { // no-warning
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return 0;
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}
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return 1;
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}
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int testNoInitializationPlacement() {
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int n;
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new (&n) int;
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// Should warn that n is uninitialized.
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if (n) { // no-warning
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return 0;
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}
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return 1;
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}
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