http://llvm.org/bugs/show_bug.cgi?id=16745
Bug ID: 16745
Summary: Static analyzer incorrectly models a synthesized
assignment operator
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], [email protected]
Classification: Unclassified
$ cat small.cc
struct A {
A& operator=(A&);
};
struct B {
int a;
A b[1];
};
void fn1() {
B v, u;
u = v;
}
$ clang -std=c++11 --analyze small.cc -Xanalyzer -analyzer-output=text
small.cc:5:8: warning: Array subscript is undefined
struct B {
^
small.cc:12:3: note: Calling implicit copy assignment operator for 'B'
u = v;
^
small.cc:5:8: note: Loop condition is true. Entering loop body
struct B {
^
small.cc:5:8: note: Uninitialized value stored to '__i0'
small.cc:5:8: note: Array subscript is undefined
1 warning generated.
I haven't looked into how the synthesized function looks like, but obviously it
uses a loop to copy the b sub-array and somehow the loop variable ends up
undefined.
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