I'm writing a gcc plugin to find out target basic blocks to branch instructions, and need to match instructions and basic blocks with compiled binaries, so I decided to explicitly annotate all the branch
instructions and basic blocks with named labels, then from the compiler plugin I assign named labels to branch instructions and basic blocks, and from symbol table I can get offset to these instructions
and basic blocks. Is this the right way to do it, or I shouldn't do this task in compiling phase?
When I was trying with this method, I wrote a plugin with some code like this:
rtx insn, bb_start, bb_end;
bb_start = gen_label_rtx();
LABEL_NAME(bb_start) = "BB Start";
LABEL_NUSES(bb_start) = 1;
bb_end = gen_label_rtx();
LABEL_NAME(bb_end) = "BB End";
LABEL_NUSES(bb_end) = 1;
I insert this pass before final pass. But when compiling C program with this plugin, I got error:
foo.c:7:1: internal compiler error: in final, at final.c:1958
It seems this is not the correct way to insert labels. Am I using emit_label_* in a wrong way, at wrong time, or I'm totally in the wrong direction?