Could a gatekeeper review and approve the attached patch for bug #726? Below is a description of the problem and it's fix.
Thanks
Bob Scollard
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The problem occurs when IPA tries to inline a function pointer that:
- has varargs,
- is determined to be partially inlinable (see
Identify_Partial_Inline_Candiate() and
Has_Partial_Inline_Attrib()), and
- has a void return type.
The assert failure occurs in function ST_Type when called from
ipo_inline.cxx:IPO_INLINE::Post_Process_Caller because it is not recognized
that the callee has a void return type. The return type is not recognized as
void because the call to aux.rp.size () returns a value greater than zero.
Member rp of struct IPO_INLINE_AUX is of type class RETURN_PREG. Class
RETURN_PREG contains the union (see ipa/main/optimize/ipo_inline_util.h ):
union {
DEDICATED_RETURN_PREGS old_style; // no OPR_RETURN_VAL
NEGATIVE_RETURN_PREGS new_style; // use OPR_RETURN_VAL
} _u;
and uses the BOOL member use_return_val as a tag field where a TRUE value
indicates that new_style field should be used (and a FALSE value indicates that
the old_style field should be used). The RETURN_PREG constructor initializes
use_return_val to TRUE but initializes the old_style data item. The member
function RETURN_PREG::size() checks the use_return_val returning:
return use_return_val ? 1 : _u.old_style.num_pregs;
causing a size greater than zero (i.e., 1) for a function returning void.
The fix is to change the RETURN_PREG constructor to set the use_return_val to
FALSE.
726.p
Description: 726.p
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