llvm-project/clang/test/Analysis/invalidated-iterator.cpp

// RUN: %clang_analyze_cc1 -std=c++11 -analyzer-checker=core,cplusplus,alpha.cplusplus.InvalidatedIterator -analyzer-config aggressive-binary-operation-simplification=true -analyzer-config c++-container-inlining=false %s -verify
// RUN: %clang_analyze_cc1 -std=c++11 -analyzer-checker=core,cplusplus,alpha.cplusplus.InvalidatedIterator -analyzer-config aggressive-binary-operation-simplification=true -analyzer-config c++-container-inlining=true -DINLINE=1 %s -verify
// RUN: %clang_analyze_cc1 -std=c++23 -analyzer-checker=core,cplusplus,alpha.cplusplus.InvalidatedIterator -analyzer-config aggressive-binary-operation-simplification=true -analyzer-config c++-container-inlining=true -DINLINE=1 %s -verify

#include "Inputs/system-header-simulator-cxx.h"

void clang_analyzer_warnIfReached();

void normal_dereference(std::vector<int> &V) {
  auto i = V.cbegin();
  *i; // no-warning
}

void invalidated_dereference(std::vector<int> &V) {
  auto i = V.cbegin();
  V.erase(i);
  *i; // expected-warning{{Invalidated iterator accessed}}
}

void normal_prefix_increment(std::vector<int> &V) {
  auto i = V.cbegin();
  ++i; // no-warning
}

void invalidated_prefix_increment(std::vector<int> &V) {
  auto i = V.cbegin();
  V.erase(i);
  ++i; // expected-warning{{Invalidated iterator accessed}}
}

void normal_prefix_decrement(std::vector<int> &V) {
  auto i = ++V.cbegin();
  --i; // no-warning
}

void invalidated_prefix_decrement(std::vector<int> &V) {
  auto i = ++V.cbegin();
  V.erase(i);
  --i; // expected-warning{{Invalidated iterator accessed}}
}

void normal_postfix_increment(std::vector<int> &V) {
  auto i = V.cbegin();
  i++; // no-warning
}

void invalidated_postfix_increment(std::vector<int> &V) {
  auto i = V.cbegin();
  V.erase(i);
  i++; // expected-warning{{Invalidated iterator accessed}}
}

void normal_postfix_decrement(std::vector<int> &V) {
  auto i = ++V.cbegin();
  i--; // no-warning
}

void invalidated_postfix_decrement(std::vector<int> &V) {
  auto i = ++V.cbegin();
  V.erase(i);
  i--; // expected-warning{{Invalidated iterator accessed}}
}

void normal_increment_by_2(std::vector<int> &V) {
  auto i = V.cbegin();
  i += 2; // no-warning
}

void invalidated_increment_by_2(std::vector<int> &V) {
  auto i = V.cbegin();
  V.erase(i);
  i += 2; // expected-warning{{Invalidated iterator accessed}}
}

void normal_increment_by_2_copy(std::vector<int> &V) {
  auto i = V.cbegin();
  auto j = i + 2; // no-warning
}

void invalidated_increment_by_2_copy(std::vector<int> &V) {
  auto i = V.cbegin();
  V.erase(i);
  auto j = i + 2; // expected-warning{{Invalidated iterator accessed}}
}

void normal_decrement_by_2(std::vector<int> &V) {
  auto i = V.cbegin();
  i -= 2; // no-warning
}

void invalidated_decrement_by_2(std::vector<int> &V) {
  auto i = V.cbegin();
  V.erase(i);
  i -= 2; // expected-warning{{Invalidated iterator accessed}}
}

void normal_decrement_by_2_copy(std::vector<int> &V) {
  auto i = V.cbegin();
  auto j = i - 2; // no-warning
}

void invalidated_decrement_by_2_copy(std::vector<int> &V) {
  auto i = V.cbegin();
  V.erase(i);
  auto j = i - 2; // expected-warning{{Invalidated iterator accessed}}
}

void normal_subscript(std::vector<int> &V) {
  auto i = V.cbegin();
  i[1]; // no-warning
}

void invalidated_subscript(std::vector<int> &V) {
  auto i = V.cbegin();
  V.erase(i);
  i[1]; // expected-warning{{Invalidated iterator accessed}}
}

void assignment(std::vector<int> &V) {
  auto i = V.cbegin();
  V.erase(i);
  auto j = V.cbegin(); // no-warning
}

template<typename T>
struct cont_with_ptr_iterator {
  T *begin() const;
  T *end() const;
  T &operator[](size_t);
  void push_back(const T&);
  T* erase(T*);
};

void invalidated_access_via_end_iterator_after_push_back() {
  cont_with_ptr_iterator<int> C;
  C.push_back(1);
  auto i = C.end();
  C.push_back(2);
  auto j = i[-1]; // expected-warning{{Invalidated iterator accessed}}
}

void invalidated_dereference_end_ptr_iterator(cont_with_ptr_iterator<int> &C) {
  auto i = C.begin();
  C.erase(i);
  (void) *i; // expected-warning{{Invalidated iterator accessed}}
}

void invalidated_prefix_increment_end_ptr_iterator(
    cont_with_ptr_iterator<int> &C) {
  auto i = C.begin();
  C.erase(i);
  ++i; // expected-warning{{Invalidated iterator accessed}}
}

void invalidated_prefix_decrement_end_ptr_iterator(
    cont_with_ptr_iterator<int> &C) {
  auto i = C.begin() + 1;
  C.erase(i);
  --i; // expected-warning{{Invalidated iterator accessed}}
}

void invalidated_postfix_increment_end_ptr_iterator(
    cont_with_ptr_iterator<int> &C) {
  auto i = C.begin();
  C.erase(i);
  i++; // expected-warning{{Invalidated iterator accessed}}
}

void invalidated_postfix_decrement_end_ptr_iterator(
    cont_with_ptr_iterator<int> &C) {
  auto i = C.begin() + 1;
  C.erase(i);
  i--; // expected-warning{{Invalidated iterator accessed}}
}

void invalidated_increment_by_2_end_ptr_iterator(
    cont_with_ptr_iterator<int> &C) {
  auto i = C.begin();
  C.erase(i);
  i += 2; // expected-warning{{Invalidated iterator accessed}}
}

void invalidated_increment_by_2_copy_end_ptr_iterator(
    cont_with_ptr_iterator<int> &C) {
  auto i = C.begin();
  C.erase(i);
  auto j = i + 2; // expected-warning{{Invalidated iterator accessed}}
}

void invalidated_decrement_by_2_end_ptr_iterator(
    cont_with_ptr_iterator<int> &C) {
  auto i = C.begin();
  C.erase(i);
  i -= 2; // expected-warning{{Invalidated iterator accessed}}
}

void invalidated_decrement_by_2_copy_end_ptr_iterator(
    cont_with_ptr_iterator<int> &C) {
  auto i = C.begin();
  C.erase(i);
  auto j = i - 2; // expected-warning{{Invalidated iterator accessed}}
}

void invalidated_subscript_end_ptr_iterator(cont_with_ptr_iterator<int> &C) {
  auto i = C.begin();
  C.erase(i);
  (void) i[1]; // expected-warning{{Invalidated iterator accessed}}
}

#if __cplusplus >= 202302L
namespace GH116372 {
  class ExplicitThis {
    int f = 0;
  public:
    ExplicitThis();
    ExplicitThis(ExplicitThis& other);
  
    ExplicitThis& operator=(this ExplicitThis& self, ExplicitThis const& other) { // no crash
      self.f = other.f;
      return self;
    }
  
    ~ExplicitThis();
  };
  
  void func(ExplicitThis& obj1) {
      obj1 = obj1;
  }
}
#endif