84 lines
3.1 KiB
C++
84 lines
3.1 KiB
C++
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// RUN: %clang_analyze_cc1 -x c++ -analyzer-checker=core -analyzer-output=text -verify %s
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typedef unsigned char uint8_t;
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#define UINT8_MAX 255
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#define TCP_MAXWIN 65535
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uint8_t get_uint8_max() {
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uint8_t rcvscale = UINT8_MAX; // expected-note{{'rcvscale' initialized to 255}}
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return rcvscale; // expected-note{{Returning the value 255 (loaded from 'rcvscale')}}
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}
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void shift_by_undefined_value() {
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uint8_t shift_amount = get_uint8_max(); // expected-note{{'shift_amount' initialized to 255}}
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// expected-note@-1{{Calling 'get_uint8_max'}}
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// expected-note@-2{{Returning from 'get_uint8_max'}}
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(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'}}
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// 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'}}
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}
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namespace array_index_tracking {
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void consume(int);
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int getIndex(int x) {
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int a;
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if (x > 0) // expected-note {{Assuming 'x' is > 0}}
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// expected-note@-1 {{Taking true branch}}
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a = 3; // expected-note {{The value 3 is assigned to 'a'}}
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else
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a = 2;
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return a; // expected-note {{Returning the value 3 (loaded from 'a')}}
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}
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int getInt();
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void testArrayIndexTracking() {
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int arr[10];
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for (int i = 0; i < 3; ++i)
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// expected-note@-1 3{{Loop condition is true. Entering loop body}}
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// expected-note@-2 {{Loop condition is false. Execution continues on line 43}}
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arr[i] = 0;
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int x = getInt();
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int n = getIndex(x); // expected-note {{Calling 'getIndex'}}
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// expected-note@-1 {{Returning from 'getIndex'}}
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// expected-note@-2 {{'n' initialized to 3}}
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consume(arr[n]);
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// expected-note@-1 {{1st function call argument is an uninitialized value}}
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// expected-warning@-2{{1st function call argument is an uninitialized value}}
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}
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} // end of namespace array_index_tracking
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namespace multi_array_index_tracking {
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void consume(int);
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int getIndex(int x) {
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int a;
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if (x > 0) // expected-note {{Assuming 'x' is > 0}}
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// expected-note@-1 {{Taking true branch}}
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a = 3; // expected-note {{The value 3 is assigned to 'a'}}
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else
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a = 2;
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return a; // expected-note {{Returning the value 3 (loaded from 'a')}}
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}
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int getInt();
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void testArrayIndexTracking() {
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int arr[2][10];
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for (int i = 0; i < 3; ++i)
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// expected-note@-1 3{{Loop condition is true. Entering loop body}}
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// expected-note@-2 {{Loop condition is false. Execution continues on line 75}}
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arr[1][i] = 0;
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int x = getInt();
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int n = getIndex(x); // expected-note {{Calling 'getIndex'}}
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// expected-note@-1 {{Returning from 'getIndex'}}
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// expected-note@-2 {{'n' initialized to 3}}
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consume(arr[1][n]);
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// expected-note@-1 {{1st function call argument is an uninitialized value}}
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// expected-warning@-2{{1st function call argument is an uninitialized value}}
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}
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} // end of namespace mulit_array_index_tracking
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