loop-widening-notes.cpp
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// RUN: %clang_analyze_cc1 -analyzer-checker=core,alpha -analyzer-max-loop 2 -analyzer-config widen-loops=true -analyzer-output=text -verify -analyzer-config eagerly-assume=false %s
int *p_a;
int bar();
int flag_a;
int test_for_bug_25609() {
if (p_a == 0) // expected-note {{Assuming 'p_a' is equal to null}}
// expected-note@-1 {{Taking true branch}}
bar();
for (int i = 0; // expected-note {{Loop condition is true. Entering loop body}}
// expected-note@-1 {{Loop condition is false. Execution continues on line 16}}
++i, // expected-note {{Value assigned to 'p_a'}}
i < flag_a;
++i) {}
*p_a = 25609; // no-crash expected-warning {{Dereference of null pointer (loaded from variable 'p_a')}}
// expected-note@-1 {{Dereference of null pointer (loaded from variable 'p_a')}}
return *p_a;
}
int flag_b;
int while_analyzer_output() {
flag_b = 100;
int num = 10;
while (flag_b-- > 0) { // expected-note {{Loop condition is true. Entering loop body}}
// expected-note@-1 {{Value assigned to 'num'}}
// expected-note@-2 {{Loop condition is false. Execution continues on line 30}}
num = flag_b;
}
if (num < 0) // expected-note {{Assuming 'num' is >= 0}}
// expected-note@-1 {{Taking false branch}}
flag_b = 0;
else if (num >= 1) // expected-note {{Assuming 'num' is < 1}}
// expected-note@-1 {{Taking false branch}}
flag_b = 50;
else
flag_b = 100;
return flag_b / num; // no-crash expected-warning {{Division by zero}}
// expected-note@-1 {{Division by zero}}
}
int flag_c;
int do_while_analyzer_output() {
int num = 10;
do { // expected-note {{Loop condition is true. Execution continues on line 47}}
// expected-note@-1 {{Loop condition is false. Exiting loop}}
num--;
} while (flag_c-- > 0); //expected-note {{Value assigned to 'num'}}
int local = 0;
if (num == 0) // expected-note {{Assuming 'num' is equal to 0}}
// expected-note@-1 {{Taking true branch}}
local = 10 / num; // no-crash expected-warning {{Division by zero}}
// expected-note@-1 {{Division by zero}}
return local;
}
int flag_d;
int test_for_loop() {
int num = 10;
for (int i = 0; // expected-note {{Loop condition is true. Entering loop body}}
// expected-note@-1 {{Loop condition is false. Execution continues on line 67}}
new int(10), // expected-note {{Value assigned to 'num'}}
i < flag_d;
++i) {
++num;
}
if (num == 0) // expected-note {{Assuming 'num' is equal to 0}}
// expected-note@-1 {{Taking true branch}}
flag_d += 10;
return flag_d / num; // no-crash expected-warning {{Division by zero}}
// expected-note@-1 {{Division by zero}}
}