[Lldb-commits] [lldb] [debugserver] Implement MultiMemRead packet (PR #162670)

[Felipe de Azevedo Piovezan via lldb-commits]

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@@ -3160,6 +3165,140 @@ rnb_err_t RNBRemote::HandlePacket_m(const char *p) {
   return SendPacket(ostrm.str());
 }
 
+/// Returns true if `str` starts with `prefix`.
+static bool starts_with(std::string_view str, std::string_view prefix) {
+  return str.size() >= prefix.size() &&
+         str.compare(0, prefix.size(), prefix) == 0;
+}
+
+/// Attempts to parse a prefix of `number_str` as a number of type `T`. If
+/// successful, the number is returned and the prefix is dropped from
+/// `number_str`.
+template <typename T>
+static std::optional<T> extract_number(std::string_view &number_str) {
+  static_assert(std::is_integral<T>());
+  char *str_end = nullptr;
+  errno = 0;
+  nub_addr_t number = strtoull(number_str.data(), &str_end, 16);
+  if (errno != 0)
+    return std::nullopt;
+  assert(str_end);
+  number_str.remove_prefix(str_end - number_str.data());
+  return number;
+}
+
+/// Splits `list_str` into multiple string_views separated by `,`.
+static std::vector<std::string_view>
+parse_comma_separated_list(std::string_view list_str) {
+  std::vector<std::string_view> list;
+  while (!list_str.empty()) {
+    auto pos = list_str.find(',');
+    list.push_back(list_str.substr(0, pos));
+    if (pos == list_str.npos)
+      break;
+    list_str.remove_prefix(pos + 1);
+  }
+  return list;
+}
+
+rnb_err_t RNBRemote::HandlePacket_MultiMemRead(const char *p) {
+  const std::string_view packet_name("MultiMemRead:");
+  std::string_view packet(p);
+
+  if (!starts_with(packet, packet_name))
+    return HandlePacket_ILLFORMED(__FILE__, __LINE__, p,
+                                  "Invalid MultiMemRead packet prefix");
+
+  packet.remove_prefix(packet_name.size());
+
+  const std::string_view ranges_prefix("ranges:");
+  if (!starts_with(packet, ranges_prefix))
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felipepiovezan wrote:

Addressed by removing the options field.

https://github.com/llvm/llvm-project/pull/162670