Pietro Fezzardi a96f98821c [DLA] Add AdjustStackPointerPass FunctionPass ...

Add a pass that computes the lowest negative offset that is summed in
each isolated function to the local stack pointer returned by a call to
revng_init_local_sp (previously added by PromoteStackPointerPass).
After the computation, all the accesses relative to the stack pointer
are recomputed as if the stack pointer was lowered by the computed
amount.

This is useful to enable the DLA to easily recover layouts that are
placed at negative offsets from the stack pointer.
The reason is that the DLA in its current form does not handle negative
offsets, but at the same time negative offsets are important to recover
the layout of the local variables on the stack.

This pass implicitly depends on running PromoteStackPointerPass.
If PromoteStackPointerPass did not run before the execution of
AdjustStackPointerPass, the latter doesn't do anything.

For demonstration purposes, AdjustStackPointerPass has been implemented
both with LLVM's legacy PassManager and the new PassManager.

2021-02-02 11:23:53 +01:00

..

AdjustStackPointerPass.cpp

[DLA] Add AdjustStackPointerPass FunctionPass

2021-02-02 11:23:53 +01:00

CMakeLists.txt

[DLA] Add AdjustStackPointerPass FunctionPass

2021-02-02 11:23:53 +01:00