Commits on Aug 23, 2023

1. DWARF CFI: use a stack for restore/remember opcodes …

   Implementing the `DW_CFA_remember_state` and `DW_CFA_restore_state`
   according to the DWARF specification requires us to create a stack that
   can store an arbitrary number of elements, that is, there could be
   multiple "pushes" before "popping" them.
   
   From the 5th revision of the spec [0]:
   
   > 6.4.2.4 Row State Instructions
   > DW_CFA_remember_state
   > 	The DW_CFA_remember_state instruction takes no operands. The required
   >	action is to push the set of rules for every register onto an implicit stack.
   >	DW_CFA_restore_state
   > DW_CFA_restore_state
   >	The DW_CFA_restore_state instruction takes no operands. The required action
   >	is to pop the set of rules off the implicit stack and place them in the
   >	current row.
   
   - [0]: https://dwarfstd.org/doc/DWARF5.pdf
   
   Signed-off-by: Francisco Javier Honduvilla Coto <javierhonduco@gmail.com>

   

   javierhonduco committed Aug 23, 2023
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