http://llvm.org/bugs/show_bug.cgi?id=17489
Bug ID: 17489
Summary: False positive with containers & loop initialized
value, container excluding assumptions with empty()
with size()
Product: clang
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: Static Analyzer
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
For this code below analyzer assumes !empty() and size()==0 as a possible case
clang version 3.4 (191810)
#include <iostream>
#include <vector>
struct foo_t{ int value; void prt(){ std::cout << "Hello, world!"<< value <<
std::endl;}};
using foo_list_t =std::vector<foo_t>;
void func( foo_list_t & foo_list )
{
if( !foo_list.empty() )
{
foo_t * first_foo = nullptr;
for( size_t i=0; i<foo_list.size(); ++i)
{
if( i == 0 )
first_foo = &foo_list[i];
std::cout << ".";
}
first_foo->prt();
}
}
int main(int argc, char **argv)
{
foo_list_t foo_list{ {0},{1},{2}};
func(foo_list);
return 0;
}
-----------------------------------------------
9 if( !foo_list.empty() )
2
←Taking true branch→
10 {
11 foo_t * first_foo = nullptr;
3
←'first_foo' initialized to a null pointer value
→
12 for( size_t i=0; i<foo_list.size(); ++i)
4
←Loop condition is false. Execution continues on line 18
→
13 {
14 if( i == 0 )
15 first_foo = &foo_list[i];
16 std::cout << ".";
17 }
18 first_foo->prt();
5
←Called C++ object pointer is null
19 }
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