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// RUN: %clang_cc1 -analyze -analyzer-checker=core,unix.Malloc,debug.ExprInspection -analyzer-store region -analyzer-ipa=inlining -cfg-add-implicit-dtors -Wno-null-dereference -verify %s
void clang_analyzer_eval(bool);
class A {
public:
~A() {
int *x = 0;
*x = 3; // expected-warning{{Dereference of null pointer}}
}
};
int main() {
A a;
}
typedef __typeof(sizeof(int)) size_t;
void *malloc(size_t);
void free(void *);
class SmartPointer {
void *X;
public:
SmartPointer(void *x) : X(x) {}
~SmartPointer() {
free(X);
}
};
void testSmartPointer() {
char *mem = (char*)malloc(4);
{
SmartPointer Deleter(mem);
// destructor called here
}
*mem = 0; // expected-warning{{Use of memory after it is freed}}
}
void doSomething();
void testSmartPointer2() {
char *mem = (char*)malloc(4);
{
SmartPointer Deleter(mem);
// Remove dead bindings...
doSomething();
// destructor called here
}
*mem = 0; // expected-warning{{Use of memory after it is freed}}
}
class Subclass : public SmartPointer {
public:
Subclass(void *x) : SmartPointer(x) {}
};
void testSubclassSmartPointer() {
char *mem = (char*)malloc(4);
{
Subclass Deleter(mem);
// Remove dead bindings...
doSomething();
// destructor called here
}
*mem = 0; // expected-warning{{Use of memory after it is freed}}
}
class MultipleInheritance : public Subclass, public SmartPointer {
public:
MultipleInheritance(void *a, void *b) : Subclass(a), SmartPointer(b) {}
};
void testMultipleInheritance1() {
char *mem = (char*)malloc(4);
{
MultipleInheritance Deleter(mem, 0);
// Remove dead bindings...
doSomething();
// destructor called here
}
*mem = 0; // expected-warning{{Use of memory after it is freed}}
}
void testMultipleInheritance2() {
char *mem = (char*)malloc(4);
{
MultipleInheritance Deleter(0, mem);
// Remove dead bindings...
doSomething();
// destructor called here
}
*mem = 0; // expected-warning{{Use of memory after it is freed}}
}
void testMultipleInheritance3() {
char *mem = (char*)malloc(4);
{
MultipleInheritance Deleter(mem, mem);
// Remove dead bindings...
doSomething();
// destructor called here
// expected-warning@27 {{Attempt to free released memory}}
}
}
class SmartPointerMember {
SmartPointer P;
public:
SmartPointerMember(void *x) : P(x) {}
};
void testSmartPointerMember() {
char *mem = (char*)malloc(4);
{
SmartPointerMember Deleter(mem);
// Remove dead bindings...
doSomething();
// destructor called here
}
*mem = 0; // expected-warning{{Use of memory after it is freed}}
}
struct IntWrapper {
IntWrapper() : x(0) {}
~IntWrapper();
int *x;
};
void testArrayInvalidation() {
int i = 42;
int j = 42;
{
IntWrapper arr[2];
// There should be no undefined value warnings here.
// Eventually these should be TRUE as well, but right now
// we can't handle array constructors.
clang_analyzer_eval(arr[0].x == 0); // expected-warning{{UNKNOWN}}
clang_analyzer_eval(arr[1].x == 0); // expected-warning{{UNKNOWN}}
arr[0].x = &i;
arr[1].x = &j;
clang_analyzer_eval(*arr[0].x == 42); // expected-warning{{TRUE}}
clang_analyzer_eval(*arr[1].x == 42); // expected-warning{{TRUE}}
}
// The destructors should have invalidated i and j.
clang_analyzer_eval(i == 42); // expected-warning{{UNKNOWN}}
clang_analyzer_eval(j == 42); // expected-warning{{UNKNOWN}}
}
// Don't crash on a default argument inside an initializer.
struct DefaultArg {
DefaultArg(int x = 0) {}
~DefaultArg();
};
struct InheritsDefaultArg : DefaultArg {
InheritsDefaultArg() {}
virtual ~InheritsDefaultArg();
};
void testDefaultArg() {
InheritsDefaultArg a;
// Force a bug to be emitted.
*(char *)0 = 1; // expected-warning{{Dereference of null pointer}}
}
namespace DestructorVirtualCalls {
class A {
public:
int *out1, *out2, *out3;
virtual int get() { return 1; }
~A() {
*out1 = get();
}
};
class B : public A {
public:
virtual int get() { return 2; }
~B() {
*out2 = get();
}
};
class C : public B {
public:
virtual int get() { return 3; }
~C() {
*out3 = get();
}
};
void test() {
int a, b, c;
// New scope for the C object.
{
C obj;
clang_analyzer_eval(obj.get() == 3); // expected-warning{{TRUE}}
// Sanity check for devirtualization.
A *base = &obj;
clang_analyzer_eval(base->get() == 3); // expected-warning{{TRUE}}
obj.out1 = &a;
obj.out2 = &b;
obj.out3 = &c;
}
clang_analyzer_eval(a == 1); // expected-warning{{TRUE}}
clang_analyzer_eval(b == 2); // expected-warning{{TRUE}}
clang_analyzer_eval(c == 3); // expected-warning{{TRUE}}
}
}
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