baa78cc6d3
Tracking those can help to provide much better diagnostics in many cases. In general, most of the visitor machinery should be refactored to allow tracking the origin of arbitrary values. rdar://36039765 Differential Revision: https://reviews.llvm.org/D51131 llvm-svn: 340475
20 lines
1.0 KiB
C++
20 lines
1.0 KiB
C++
// RUN: %clang_analyze_cc1 -x c++ -analyzer-checker=core -analyzer-output=text -verify %s
|
|
|
|
typedef unsigned char uint8_t;
|
|
|
|
#define UINT8_MAX 255
|
|
#define TCP_MAXWIN 65535
|
|
|
|
uint8_t get_uint8_max() {
|
|
uint8_t rcvscale = UINT8_MAX; // expected-note{{'rcvscale' initialized to 255}}
|
|
return rcvscale; // expected-note{{Returning the value 255 (loaded from 'rcvscale')}}
|
|
}
|
|
|
|
void shift_by_undefined_value() {
|
|
uint8_t shift_amount = get_uint8_max(); // expected-note{{'shift_amount' initialized to 255}}
|
|
// expected-note@-1{{Calling 'get_uint8_max'}}
|
|
// expected-note@-2{{Returning from 'get_uint8_max'}}
|
|
(void)(TCP_MAXWIN << shift_amount); // expected-warning{{The result of the left shift is undefined due to shifting by '255', which is greater or equal to the width of type 'int'}}
|
|
// expected-note@-1{{The result of the left shift is undefined due to shifting by '255', which is greater or equal to the width of type 'int'}}
|
|
}
|