| // 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'}} |
| } |
| |
| namespace array_index_tracking { |
| void consume(int); |
| |
| int getIndex(int x) { |
| int a; |
| if (x > 0) // expected-note {{Assuming 'x' is > 0}} |
| // expected-note@-1 {{Taking true branch}} |
| a = 3; // expected-note {{The value 3 is assigned to 'a'}} |
| else |
| a = 2; |
| return a; // expected-note {{Returning the value 3 (loaded from 'a')}} |
| } |
| |
| int getInt(); |
| |
| void testArrayIndexTracking() { |
| int arr[10]; |
| |
| for (int i = 0; i < 3; ++i) |
| // expected-note@-1 3{{Loop condition is true. Entering loop body}} |
| // expected-note@-2 {{Loop condition is false. Execution continues on line 43}} |
| arr[i] = 0; |
| int x = getInt(); |
| int n = getIndex(x); // expected-note {{Calling 'getIndex'}} |
| // expected-note@-1 {{Returning from 'getIndex'}} |
| // expected-note@-2 {{'n' initialized to 3}} |
| consume(arr[n]); |
| // expected-note@-1 {{1st function call argument is an uninitialized value}} |
| // expected-warning@-2{{1st function call argument is an uninitialized value}} |
| } |
| } // end of namespace array_index_tracking |
| |
| namespace multi_array_index_tracking { |
| void consume(int); |
| |
| int getIndex(int x) { |
| int a; |
| if (x > 0) // expected-note {{Assuming 'x' is > 0}} |
| // expected-note@-1 {{Taking true branch}} |
| a = 3; // expected-note {{The value 3 is assigned to 'a'}} |
| else |
| a = 2; |
| return a; // expected-note {{Returning the value 3 (loaded from 'a')}} |
| } |
| |
| int getInt(); |
| |
| void testArrayIndexTracking() { |
| int arr[2][10]; |
| |
| for (int i = 0; i < 3; ++i) |
| // expected-note@-1 3{{Loop condition is true. Entering loop body}} |
| // expected-note@-2 {{Loop condition is false. Execution continues on line 75}} |
| arr[1][i] = 0; |
| int x = getInt(); |
| int n = getIndex(x); // expected-note {{Calling 'getIndex'}} |
| // expected-note@-1 {{Returning from 'getIndex'}} |
| // expected-note@-2 {{'n' initialized to 3}} |
| consume(arr[1][n]); |
| // expected-note@-1 {{1st function call argument is an uninitialized value}} |
| // expected-warning@-2{{1st function call argument is an uninitialized value}} |
| } |
| } // end of namespace mulit_array_index_tracking |