clang/test/Analysis/infeasible-crash.c

   1 // RUN: %clang_analyze_cc1 %s \
   2 // RUN:   -analyzer-checker=core \
   3 // RUN:   -analyzer-checker=alpha.unix.cstring.OutOfBounds,alpha.unix.cstring.UninitializedRead \
   4 // RUN:   -analyzer-config eagerly-assume=false \
   5 // RUN:   -verify
   6
   7 // expected-no-diagnostics
   8
   9 typedef typeof(sizeof(int)) size_t;
  10 void *memmove(void *, const void *, size_t);
  11
  12 typedef struct {
  13   char a[1024];
  14 } b;
  15 int c;
  16 b *invalidate();
  17 int d() {
  18   b *a = invalidate();
  19   if (c < 1024)
  20     return 0;
  21   int f = c & ~3, g = f;
  22   g--;
  23   if (g)
  24     return 0;
  25
  26   // Parent state is already infeasible.
  27   // clang_analyzer_printState();
  28   // "constraints": [
  29   //   { "symbol": "(derived_$3{conj_$0{int, LC1, S728, #1},c}) & -4", "range": "{ [1, 1] }" },
  30   //   { "symbol": "derived_$3{conj_$0{int, LC1, S728, #1},c}", "range": "{ [1024, 2147483647] }" }
  31   // ],
  32
  33   // This sould not crash!
  34   // It crashes in baseline, since there both true and false states are nullptr!
  35   memmove(a->a, &a->a[f], c - f);
  36
  37   return 0;
  38 }