bitwise-ops.c revision 651f13cea278ec967336033dd032faef0e9fc2ec 
1// RUN: %clang_cc1 -analyze -analyzer-checker=core,debug.ExprInspection -triple x86_64-apple-darwin13 -Wno-shift-count-overflow -verify %s
2
3void clang_analyzer_eval(int);
4#define CHECK(expr) if (!(expr)) return; clang_analyzer_eval(expr)
5
6void testPersistentConstraints(int x, int y) {
7  // Sanity check
8  CHECK(x); // expected-warning{{TRUE}}
9  CHECK(x & 1); // expected-warning{{TRUE}}
10
11  // False positives due to SValBuilder giving up on certain kinds of exprs.
12  CHECK(1 - x); // expected-warning{{UNKNOWN}}
13  CHECK(x & y); // expected-warning{{UNKNOWN}}
14}
15
16int testConstantShifts_PR18073(int which) {
17  // FIXME: We should have a checker that actually specifically checks bitwise
18  // shifts against the width of the LHS's /static/ type, rather than just
19  // having BasicValueFactory return "undefined" when dealing with two constant
20  // operands.
21  switch (which) {
22  case 1:
23    return 0ULL << 63; // no-warning
24  case 2:
25    return 0ULL << 64; // expected-warning{{The result of the '<<' expression is undefined}}
26  case 3:
27    return 0ULL << 65; // expected-warning{{The result of the '<<' expression is undefined}}
28
29  default:
30    return 0;
31  }
32}