https://bugs.llvm.org/show_bug.cgi?id=43343
Bug ID: 43343
Summary: DW_AT_call_value location may be clobbered by callee
Product: libraries
Version: trunk
Hardware: PC
OS: All
Status: NEW
Severity: normal
Priority: P
Component: DebugInfo
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected],
[email protected],
[email protected]
In https://reviews.llvm.org/D67556, David Stenberg gives an example of how the
location of a parameter in a caller can escape and be clobbered by the callee.
In this case, the debugger may print a misleading description for the parameter
when stopped in the callee.
The setup is roughly:
```
void caller() {
int local = 0;
escape(&local);
callee(local);
}
void callee(int p) {
cause_arg1_to_be_optimized_out();
*escaped_ptr_to_local = 1;
// print 'p' in the debugger: will show '1' instead of '0'.
}
```
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