Valeriy Savchenko 73c120a989 [analyzer] Introduce reasoning about symbolic remainder operator
Summary:
New logic tries to narrow possible result values of the remainder operation
based on its operands and their ranges.  It also tries to be conservative
with negative operands because according to the standard the sign of
the result is implementation-defined.

rdar://problem/44978988

Differential Revision: https://reviews.llvm.org/D80117
2020-05-28 18:56:38 +03:00

29 lines
412 B
C++

// RUN: %clang_analyze_cc1 -analyzer-checker=core -verify %s
// expected-no-diagnostics
void halt() __attribute__((__noreturn__));
void assert(int b) {
if (!b)
halt();
}
void decode(unsigned width) {
assert(width > 0);
int base;
bool inited = false;
int i = 0;
if (i % width == 0) {
base = 512;
inited = true;
}
base += 1; // no-warning
if (base >> 10)
assert(false);
}