clang/test/Analysis/diagnostics/macros.cpp

   1 // RUN: %clang_analyze_cc1 -std=c++11 -analyzer-checker=core,osx -analyzer-output=text -verify %s
   2
   3 #include "../Inputs/system-header-simulator.h"
   4 #include "../Inputs/system-header-simulator-cxx.h"
   5
   6 void testUnsignedIntMacro(unsigned int i) {
   7   if (i == UINT32_MAX) { // expected-note {{Assuming 'i' is equal to UINT32_MAX}}
   8                          // expected-note@-1 {{Taking true branch}}
   9     char *p = NULL; // expected-note {{'p' initialized to a null pointer value}}
  10     *p = 7;  // expected-warning {{Dereference of null pointer (loaded from variable 'p')}}
  11              // expected-note@-1 {{Dereference of null pointer (loaded from variable 'p')}}
  12   }
  13 }
  14
  15
  16 // FIXME: 'i' can never be equal to UINT32_MAX - it doesn't even fit into its
  17 // type ('int'). This should say "Assuming 'i' is equal to -1".
  18 void testIntMacro(int i) {
  19   if (i == UINT32_MAX) { // expected-note {{Assuming 'i' is equal to UINT32_MAX}}
  20                          // expected-note@-1 {{Taking true branch}}
  21     char *p = NULL; // expected-note {{'p' initialized to a null pointer value}}
  22     *p = 7;  // expected-warning {{Dereference of null pointer (loaded from variable 'p')}}
  23              // expected-note@-1 {{Dereference of null pointer (loaded from variable 'p')}}
  24   }
  25 }
  26
  27
  28
  29 void testNULLMacro(int *p) {
  30   if (p == NULL) { // expected-note {{Assuming 'p' is equal to NULL}}
  31                    // expected-note@-1 {{Taking true branch}}
  32     *p = 7;  // expected-warning {{Dereference of null pointer (loaded from variable 'p')}}
  33              // expected-note@-1 {{Dereference of null pointer (loaded from variable 'p')}}
  34   }
  35 }
  36
  37 void testnullptrMacro(int *p) {
  38   if (p == nullptr) { // expected-note {{Assuming pointer value is null}}
  39                       // expected-note@-1 {{Taking true branch}}
  40     *p = 7;  // expected-warning {{Dereference of null pointer (loaded from variable 'p')}}
  41              // expected-note@-1 {{Dereference of null pointer (loaded from variable 'p')}}
  42   }
  43 }
  44
  45 // There are no path notes on the comparison to float types.
  46 void testDoubleMacro(double d) {
  47   if (d == DBL_MAX) { // expected-note {{Assuming 'd' is equal to DBL_MAX}}
  48                       // expected-note@-1 {{Taking true branch}}
  49
  50     char *p = NULL; // expected-note {{'p' initialized to a null pointer value}}
  51     *p = 7;         // expected-warning {{Dereference of null pointer (loaded from variable 'p')}}
  52                     // expected-note@-1 {{Dereference of null pointer (loaded from variable 'p')}}
  53   }
  54 }
  55
  56 void testboolMacro(bool b, int *p) {
  57   p = nullptr;      // expected-note {{Null pointer value stored to 'p'}}
  58   if (b == false) { // expected-note {{Assuming the condition is true}}
  59                     // expected-note@-1 {{Taking true branch}}
  60     *p = 7;         // expected-warning {{Dereference of null pointer (loaded from variable 'p')}}
  61                     // expected-note@-1 {{Dereference of null pointer (loaded from variable 'p')}}
  62   }
  63 }
  64
  65 #define nested_null_split(x) if ((x) != UINT32_MAX) {}
  66
  67 void testNestedNullSplitMacro(int i, int *p) {
  68   nested_null_split(i); // expected-note {{Assuming 'i' is equal to -1}}
  69                         // expected-note@-1 {{Taking false branch}}
  70   if (!p) // expected-note {{Assuming 'p' is null}}
  71           // expected-note@-1 {{Taking true branch}}
  72     *p = 1; // expected-warning {{Dereference of null pointer (loaded from variable 'p')}}
  73             // expected-note@-1 {{Dereference of null pointer (loaded from variable 'p')}}
  74 }