clang/test/Analysis/globals-are-not-always-immutable.c

   1 // RUN: %clang_analyze_cc1 -verify %s \
   2 // RUN:   -analyzer-config eagerly-assume=false \
   3 // RUN:   -analyzer-checker=core,debug.ExprInspection
   4
   5 #include "Inputs/errno_var.h"
   6 #include "Inputs/some_system_globals.h"
   7 #include "Inputs/some_user_globals.h"
   8
   9 extern void abort() __attribute__((__noreturn__));
  10 #define assert(expr) ((expr) ? (void)(0) : abort())
  11
  12 void invalidate_globals(void);
  13 void clang_analyzer_eval(int x);
  14
  15 /// Test the special system 'errno'
  16 void test_errno_constraint() {
  17   assert(errno > 2);
  18   clang_analyzer_eval(errno > 2); // expected-warning {{TRUE}}
  19   invalidate_globals();
  20   clang_analyzer_eval(errno > 2); // expected-warning {{UNKNOWN}}
  21 }
  22 void test_errno_assign(int x) {
  23   errno = x;
  24   clang_analyzer_eval(errno == x); // expected-warning {{TRUE}}
  25   invalidate_globals();
  26   clang_analyzer_eval(errno == x); // expected-warning {{UNKNOWN}}
  27 }
  28
  29 /// Test user global variables
  30 void test_my_const_user_global_constraint() {
  31   assert(my_const_user_global > 2);
  32   clang_analyzer_eval(my_const_user_global > 2); // expected-warning {{TRUE}}
  33   invalidate_globals();
  34   clang_analyzer_eval(my_const_user_global > 2); // expected-warning {{TRUE}}
  35 }
  36 void test_my_const_user_global_assign(int); // One cannot assign value to a const lvalue.
  37
  38 void test_my_mutable_user_global_constraint() {
  39   assert(my_mutable_user_global > 2);
  40   clang_analyzer_eval(my_mutable_user_global > 2); // expected-warning {{TRUE}}
  41   invalidate_globals();
  42   clang_analyzer_eval(my_mutable_user_global > 2); // expected-warning {{UNKNOWN}}
  43 }
  44 void test_my_mutable_user_global_assign(int x) {
  45   my_mutable_user_global = x;
  46   clang_analyzer_eval(my_mutable_user_global == x); // expected-warning {{TRUE}}
  47   invalidate_globals();
  48   clang_analyzer_eval(my_mutable_user_global == x); // expected-warning {{UNKNOWN}}
  49 }
  50
  51 /// Test system global variables
  52 void test_my_const_system_global_constraint() {
  53   assert(my_const_system_global > 2);
  54   clang_analyzer_eval(my_const_system_global > 2); // expected-warning {{TRUE}}
  55   invalidate_globals();
  56   clang_analyzer_eval(my_const_system_global > 2); // expected-warning {{TRUE}}
  57 }
  58 void test_my_const_system_global_assign(int);// One cannot assign value to a const lvalue.
  59
  60 void test_my_mutable_system_global_constraint() {
  61   assert(my_mutable_system_global > 2);
  62   clang_analyzer_eval(my_mutable_system_global > 2); // expected-warning {{TRUE}}
  63   invalidate_globals();
  64   clang_analyzer_eval(my_mutable_system_global > 2); // expected-warning {{UNKNOWN}}
  65 }
  66 void test_my_mutable_system_global_assign(int x) {
  67   my_mutable_system_global = x;
  68   clang_analyzer_eval(my_mutable_system_global == x); // expected-warning {{TRUE}}
  69   invalidate_globals();
  70   clang_analyzer_eval(my_mutable_system_global == x); // expected-warning {{UNKNOWN}}
  71 }