GCC Middle and Back End API Reference

Data Fields  
dw_cfa_location  cfa 
dw_cfi_ref  cfa_cfi 
cfi_vec  reg_save 
A collected description of an entire row of the abstract CFI table.
dw_cfa_location dw_cfi_row_struct::cfa 
The expression that computes the CFA, expressed in two different ways. The CFA member for the simple cases, and the full CFI expression for the complex cases. The later will be a DW_CFA_cfa_expression.
Referenced by cfi_label_required_p(), and create_trace_edges().
dw_cfi_ref dw_cfi_row_struct::cfa_cfi 
Referenced by cfi_oprnd_equal_p().
cfi_vec dw_cfi_row_struct::reg_save 
The expressions for any register column that is saved.
Referenced by add_cfi(), and create_trace_edges().