getDwarfForAddress

pub fn getDwarfForAddress(mf: *MachOFile, gpa: Allocator, io: Io, vaddr: u64) !struct { *Dwarf, u64 } {
    if (mf.adjacent_dsym) |*dsym| {
        return .{ &dsym.dwarf, vaddr };
    }

    const symbol = Symbol.find(mf.symbols, vaddr) orelse return error.MissingDebugInfo;

    if (symbol.ofile == Symbol.unknown_ofile) return error.MissingDebugInfo;

    // offset of `address` from start of `symbol`
    const address_symbol_offset = vaddr - symbol.addr;

    // Take the symbol name from the N_FUN STAB entry, we're going to
    // use it if we fail to find the DWARF infos
    const stab_symbol = mem.sliceTo(mf.strings[symbol.strx..], 0);

    const gop = try mf.ofiles.getOrPut(gpa, symbol.ofile);
    if (!gop.found_existing) {
        const name = mem.sliceTo(mf.strings[symbol.ofile..], 0);
        gop.value_ptr.* = loadOFile(gpa, io, name);
    }
    const of = &(gop.value_ptr.* catch |err| return err);

    const symbol_index = of.symbols_by_name.getKeyAdapted(
        @as([]const u8, stab_symbol),
        @as(OFile.SymbolAdapter, .{ .strtab = of.strtab, .symtab_raw = of.symtab_raw }),
    ) orelse return error.MissingDebugInfo;

    const symbol_ofile_vaddr = vaddr: {
        var sym = of.symtab_raw[symbol_index];
        if (builtin.cpu.arch.endian() != .little) std.mem.byteSwapAllFields(macho.nlist_64, &sym);
        break :vaddr sym.n_value;
    };

    return .{ &of.dwarf, symbol_ofile_vaddr + address_symbol_offset };
}