clang/test/Analysis/fields.c

   1 // RUN: %clang_analyze_cc1 -analyzer-checker=core,alpha.core,debug.ExprInspection %s -verify
   2
   3 void clang_analyzer_eval(int);
   4
   5 unsigned foo(void);
   6 typedef struct bf { unsigned x:2; } bf;
   7 void bar(void) {
   8   bf y;
   9   *(unsigned*)&y = foo();
  10   y.x = 1;
  11 }
  12
  13 struct s {
  14   int n;
  15 };
  16
  17 void f(void) {
  18   struct s a;
  19   int *p = &(a.n) + 1; // expected-warning{{Pointer arithmetic on}}
  20 }
  21
  22 typedef struct {
  23   int x,y;
  24 } Point;
  25
  26 Point getit(void);
  27 void test(void) {
  28   Point p;
  29   (void)(p = getit()).x;
  30 }
  31
  32 #define true ((bool)1)
  33 #define false ((bool)0)
  34 typedef _Bool bool;
  35
  36
  37 void testLazyCompoundVal(void) {
  38   Point p = {42, 0};
  39   Point q;
  40   clang_analyzer_eval((q = p).x == 42); // expected-warning{{TRUE}}
  41   clang_analyzer_eval(q.x == 42); // expected-warning{{TRUE}}
  42 }
  43
  44
  45 struct Bits {
  46   unsigned a : 1;
  47   unsigned b : 2;
  48   unsigned c : 1;
  49
  50   bool x;
  51
  52   struct InnerBits {
  53     bool y;
  54
  55     unsigned d : 16;
  56     unsigned e : 6;
  57     unsigned f : 2;
  58   } inner;
  59 };
  60
  61 void testBitfields(void) {
  62   struct Bits bits;
  63
  64   if (foo() && bits.b) // expected-warning {{garbage}}
  65     return;
  66   if (foo() && bits.inner.e) // expected-warning {{garbage}}
  67     return;
  68
  69   bits.c = 1;
  70   clang_analyzer_eval(bits.c == 1); // expected-warning {{TRUE}}
  71
  72   if (foo() && bits.b) // expected-warning {{garbage}}
  73     return;
  74   if (foo() && bits.x) // expected-warning {{garbage}}
  75     return;
  76
  77   bits.x = true;
  78   clang_analyzer_eval(bits.x == true); // expected-warning{{TRUE}}
  79   bits.b = 2;
  80   clang_analyzer_eval(bits.x == true); // expected-warning{{TRUE}}
  81   if (foo() && bits.c) // no-warning
  82     return;
  83
  84   bits.inner.e = 50;
  85   if (foo() && bits.inner.e) // no-warning
  86     return;
  87   if (foo() && bits.inner.y) // expected-warning {{garbage}}
  88     return;
  89   if (foo() && bits.inner.f) // expected-warning {{garbage}}
  90     return;
  91
  92   extern struct InnerBits getInner(void);
  93   bits.inner = getInner();
  94
  95   if (foo() && bits.inner.e) // no-warning
  96     return;
  97   if (foo() && bits.inner.y) // no-warning
  98     return;
  99   if (foo() && bits.inner.f) // no-warning
 100     return;
 101
 102   bits.inner.f = 1;
 103
 104   if (foo() && bits.inner.e) // no-warning
 105     return;
 106   if (foo() && bits.inner.y) // no-warning
 107     return;
 108   if (foo() && bits.inner.f) // no-warning
 109     return;
 110
 111   if (foo() && bits.a) // expected-warning {{garbage}}
 112     return;
 113 }
 114
 115
 116 //-----------------------------------------------------------------------------
 117 // Incorrect behavior
 118 //-----------------------------------------------------------------------------
 119
 120 void testTruncation(void) {
 121   struct Bits bits;
 122   bits.c = 0x11; // expected-warning{{implicit truncation}}
 123   // FIXME: We don't model truncation of bitfields.
 124   clang_analyzer_eval(bits.c == 1); // expected-warning {{FALSE}}
 125 }