src/libcompiler_builtins/compiler-rt/test/asan/TestCases/Darwin/scribble.cc

   1 // RUN: %clang_asan -O2 %s -o %t
   2 // RUN: %run %t 2>&1 | FileCheck --check-prefix=CHECK-NOSCRIBBLE %s
   3 // RUN: %env MallocScribble=1 MallocPreScribble=1 %run %t 2>&1 | FileCheck --check-prefix=CHECK-SCRIBBLE %s
   4 // RUN: %env_asan_opts=max_free_fill_size=4096 %run %t 2>&1 | FileCheck --check-prefix=CHECK-SCRIBBLE %s
   5
   6 #include <stdint.h>
   7 #include <stdio.h>
   8 #include <stdlib.h>
   9 #include <string.h>
  10
  11 struct Isa {
  12   const char *class_name;
  13 };
  14
  15 struct MyClass {
  16   long padding;
  17   Isa *isa;
  18   long data;
  19
  20   void print_my_class_name();
  21 };
  22
  23 __attribute__((no_sanitize("address")))
  24 void MyClass::print_my_class_name() {
  25   fprintf(stderr, "this = %p\n", this);
  26   fprintf(stderr, "padding = 0x%lx\n", this->padding);
  27   fprintf(stderr, "isa = %p\n", this->isa);
  28
  29   if ((uint32_t)(uintptr_t)this->isa != 0x55555555) {
  30     fprintf(stderr, "class name: %s\n", this->isa->class_name);
  31   }
  32 }
  33
  34 int main() {
  35   Isa *my_class_isa = (Isa *)malloc(sizeof(Isa));
  36   memset(my_class_isa, 0x77, sizeof(Isa));
  37   my_class_isa->class_name = "MyClass";
  38
  39   MyClass *my_object = (MyClass *)malloc(sizeof(MyClass));
  40   memset(my_object, 0x88, sizeof(MyClass));
  41   my_object->isa = my_class_isa;
  42   my_object->data = 42;
  43
  44   my_object->print_my_class_name();
  45   // CHECK-SCRIBBLE: class name: MyClass
  46   // CHECK-NOSCRIBBLE: class name: MyClass
  47
  48   free(my_object);
  49
  50   my_object->print_my_class_name();
  51   // CHECK-NOSCRIBBLE: class name: MyClass
  52   // CHECK-SCRIBBLE: isa = {{(0x)?}}{{5555555555555555|55555555}}
  53
  54   fprintf(stderr, "okthxbai!\n");
  55   // CHECK-SCRIBBLE: okthxbai!
  56   // CHECK-NOSCRIBBLE: okthxbai!
  57   free(my_class_isa);
  58 }