DF_REF_INSN looks up the "insn" field of the referenced df_insn_info.
This will eventually be an rtx_insn *, but for now is just an rtx.
As further scaffolding: for now, convert DF_REF_INSN to a function,
adding a checked downcast to rtx_insn *. This can eventually be
converted back to macro when the field is an rtx_insn *.
gcc/
* df-core.c (DF_REF_INSN): New, using a checked cast for now.
* df.h (DF_REF_INSN): Convert from a macro to a function, so
that we can return an rtx_insn *.
/
* rtx-classes-status.txt: Add DF_REF_INSN.