http://llvm.org/bugs/show_bug.cgi?id=20486
Bug ID: 20486
Summary: recursive types with typedefs do not resolve properly
when printing type
Product: lldb
Version: unspecified
Hardware: PC
OS: All
Status: NEW
Severity: normal
Priority: P
Component: All Bugs
Assignee: lldb-dev@cs.uiuc.edu
Reporter: compn...@compnerd.org
Classification: Unclassified
When attempting to print a recursive structure type in lldb built with
assertions, the following assertion is triggered in clang:
Assertion `ExternalFieldOffsets.find(Field) != ExternalFieldOffsets.end() &&
"Field does not have an external offset"' failed
Its unclear whether the assertion in clang is overly aggressive or if the lldb
construction of the type is at fault.
A reproduction for this issue is inlined below. Note that the separation of
the TUs is required for the reproduction:
#if defined(TU_ONE)
typedef struct t *tp;
typedef tp (*get_tp)();
struct s {
get_tp_p get_tp;
};
struct t {
struct s *s;
};
struct t t;
#elif defined(TU_TWO)
typedef struct t *tp;
extern struct t t;
int main() {
tp tpi = &t;
return 0;
}
#else
#error there are 2 tus
#endif
To reproduce, set a temporary breakpoint on main; run; next; p tpi; p *tpi
Immediately printing the structure recursively (p *tpi) will actually resolve
the structure layout and cache it, preventing the issue.
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