llvm-project/clang/test/Analysis/bstring.cpp

// RUN: %clang_analyze_cc1 -analyzer-checker=core,unix.cstring,alpha.unix.cstring,debug.ExprInspection -analyzer-store=region -verify %s

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

void clang_analyzer_eval(int);

int *testStdCopyInvalidatesBuffer(std::vector<int> v) {
  int n = v.size();
  int *buf = (int *)malloc(n * sizeof(int));

  buf[0] = 66;

  // Call to copy should invalidate buf.
  std::copy(v.begin(), v.end(), buf);

  int i = buf[0];

  clang_analyzer_eval(i == 66); // expected-warning {{UNKNOWN}}

  return buf;
}

int *testStdCopyBackwardInvalidatesBuffer(std::vector<int> v) {
  int n = v.size();
  int *buf = (int *)malloc(n * sizeof(int));
  
  buf[0] = 66;

  // Call to copy_backward should invalidate buf.
  std::copy_backward(v.begin(), v.end(), buf + n);

  int i = buf[0];

  clang_analyzer_eval(i == 66); // expected-warning {{UNKNOWN}}

  return buf;
}