llvm-project/clang/test/Analysis/new-ctor-null.cpp

// RUN: %clang_analyze_cc1 -std=c++14 \
// RUN:  -analyzer-checker=core,debug.ExprInspection \
// RUN:  -verify %s

void clang_analyzer_eval(bool);
void clang_analyzer_warnIfReached();

typedef __typeof__(sizeof(int)) size_t;

void *operator new(size_t size) throw() {
  return nullptr;
  // expected-warning@-1 {{null returned from function that requires a non-null return value}}
}
void *operator new[](size_t size) throw() {
  return nullptr;
  // expected-warning@-1 {{null returned from function that requires a non-null return value}}
}

struct S {
  int x;
  S() : x(1) {
    // FIXME: Constructor should not be called with null this, even if it was
    // returned by operator new().
    clang_analyzer_warnIfReached(); // expected-warning{{REACHABLE}}
  }
  ~S() {}
};

void testArrays() {
  S *s = new S[10]; // no-crash
  s[0].x = 2;
  // no-warning: 'Dereference of null pointer' suppressed by ReturnVisitor.
}

int global;
void testInvalidationOnConstructionIntoNull() {
  global = 0;
  S *s = new S();
  // FIXME: Should be FALSE - we should not invalidate globals.
  clang_analyzer_eval(global); // expected-warning{{UNKNOWN}}
}