[LLVMdev] Determining the base offset of the stack for a function.

[Villmow, Micah]

I am running into an issue where if I have multiple functions compiled
in the same compilation unit the stack offset is not starting at zero.
For example:

func1(...)

{

...

}

 

func2(...)

{

...

}

 

Say the first function uses 64 bytes of the stack and an assumed offset
of 0 and the second function uses 32 bytes of the stack but an assumed
offset of 64. I've found out how to get the size of the stack via
MachineFrameInfo.StackSize/getObjectSize, however I have not found out
how to determine the starting offset of the stack for that specific
function. I need this information so that I can offset my stack pointer
correctly since all my indices into my stack need to start at 0 for each
independent function call. 

 

So, what this means is that if I call func1 or func2 I need to make sure
all offsets into the stack start at zero.

 

Thanks for any tips/hints, 

 

Micah Villmow

Systems Engineer

Advanced Technology & Performance

Advanced Micro Devices Inc.

S1-609 One AMD Place

Sunnyvale, CA. 94085

P: 408-749-3966

 

 

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