// GhidraScript: FindFunctionCallers.java
// Usage (headless):
//   analyzeHeadless <projDir> <projName> -process <progName> -noanalysis -readOnly \
//     -scriptPath <path> -postScript FindFunctionCallers.java 0x0063ea70
//
// Prints the functions which contain callsites (or any references) to the given function entry.

import ghidra.app.script.GhidraScript;
import ghidra.program.model.address.Address;
import ghidra.program.model.listing.Function;
import ghidra.program.model.symbol.Reference;
import ghidra.program.model.symbol.ReferenceIterator;

import java.util.LinkedHashSet;

public class FindFunctionCallers extends GhidraScript {
    @Override
    public void run() throws Exception {
        String[] args = getScriptArgs();
        if (args == null || args.length == 0) {
            printerr("FindFunctionCallers: needs one or more function entry addresses, e.g. 0x613710");
            return;
        }

        for (String a : args) {
            long va;
            try {
                va = Long.decode(a);
            } catch (Exception e) {
                printerr("bad address: " + a);
                continue;
            }
            Address entry = toAddr(va);
            if (entry == null) {
                printerr("addr not in program: " + a);
                continue;
            }

            println("=== callers for " + entry + " ===");
            LinkedHashSet<String> callers = new LinkedHashSet<>();
            ReferenceIterator it = currentProgram.getReferenceManager().getReferencesTo(entry);
            int n = 0;
            while (it.hasNext()) {
                Reference r = it.next();
                n++;
                Function f = getFunctionContaining(r.getFromAddress());
                if (f != null) {
                    callers.add(f.getName() + " @ " + f.getEntryPoint() + "  (from " + r.getFromAddress() + ")");
                } else {
                    callers.add("(no func) from " + r.getFromAddress());
                }
                if (n > 5000) break;
            }
            println("refs: " + n);
            if (callers.isEmpty()) {
                println("(none)");
            } else {
                for (String s : callers) println("  " + s);
            }
            println("");
        }
    }
}