Stack Pointer/Size on GIMPLE?

[schindew@ira.uka.de]

Hi all,

my intention is to add a pass at the Gimple (maybe SSA) level. The  
current problem is that I would like to generate code that saves the  
contents of the stack to a different memory location. Is there a way  
to access stack pointer and stack size (and the direction in which the  
stack is growing) on the tree level?

I already found STACK_SIZE and FRAME_ADDRESS on the RTL level, but  
would like to avoid adding an RTL pass.

The explanation why I want to save the stack contents is the following:
Code:

... use stack variables

__tm_atomic { /* begin transaction */

access shared locations in here

} /* may rollback */

In case of a rollback the original context of the thread must be  
restored so that it may execute the transaction again. This will be  
done using setjmp/longjmp. To prevent instrumenting all accesses to  
stack variables inside the transaction with STM runtime calls, the  
stack should be copied back from memory and the previous state of the  
stack variables is restored.

Any suggestions are helpful, thank you very much.

Regards,

Martin