38 lines · cpp
1// RUN: %clang_analyze_cc1 \2// RUN: -analyzer-checker=core,unix.Malloc \3// RUN: -verify %s4 5// expected-no-diagnostics: We do not model Integer Set Library's retain-count6// based allocation. If any of the parameters has an7// '__isl_' prefixed macro definition we escape every8// of them when we are about to 'free()' something.9 10#define __isl_take11#define __isl_keep12 13struct Object { int Ref; };14void free(void *);15 16Object *copyObj(__isl_keep Object *O) {17 O->Ref++;18 return O;19}20 21void freeObj(__isl_take Object *O) {22 if (--O->Ref > 0)23 return;24 25 free(O); // Here we notice that the parameter contains '__isl_', escape it.26}27 28void useAfterFree(__isl_take Object *A) {29 if (!A)30 return;31 32 Object *B = copyObj(A);33 freeObj(B);34 35 A->Ref = 13;36 // no-warning: 'Use of memory after it is released' was here.37}38