http://llvm.org/bugs/show_bug.cgi?id=8794
Summary: DwarfDebug emits DW_AT_frame_base even when no frame
base exists
Product: new-bugs
Version: trunk
Platform: PC
OS/Version: All
Status: NEW
Severity: normal
Priority: P
Component: new bugs
AssignedTo: [email protected]
ReportedBy: [email protected]
CC: [email protected]
For some targets (e.g. GPUs), programs are usually sufficiently small that the
entire program (an OpenCL kernel) is inlined. Such programs do not have a frame
pointer or a stack pointer.
We would like DwarfDebug::updateSubprogramScopeDIE() to not emit
DW_AT_frame_base when there is no frame base.
I had thought that using hasFP() to conditionally emit DW_AT_frame_base would
fix the problem. But probably not. Our target always returns false from
hasFP(), but I understand that other targets do not return a static true or
false. Some use hasFP() to differentiate between when FP and SP is used as
'frame base'.
What I think is needed is a way for getFrameRegister() to return as
recognizable "no frame" value and have updateSubprogramScopeDIE() test for it
before emitting DW_AT_frame_base.
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