[Lldb-commits] [PATCH] D27289: Return "thread-pcs" in jstopinfo on Linux/Android.

[Jason Majors via Phabricator via lldb-commits]

jmajors created this revision.
jmajors added a reviewer: labath.
jmajors added a subscriber: lldb-commits.
Herald added a subscriber: danalbert.

To prevent costly calls to the server to get the PC for every thread,
add all the thread's PCs to the jstopinfo message. This also makes the
Linux/Android server behave like the macOS server.


https://reviews.llvm.org/D27289

Files:
  source/Plugins/Process/gdb-remote/GDBRemoteCommunicationServerLLGS.cpp


Index: source/Plugins/Process/gdb-remote/GDBRemoteCommunicationServerLLGS.cpp
===================================================================
--- source/Plugins/Process/gdb-remote/GDBRemoteCommunicationServerLLGS.cpp
+++ source/Plugins/Process/gdb-remote/GDBRemoteCommunicationServerLLGS.cpp
@@ -415,18 +415,20 @@
 
 static void WriteRegisterValueInHexFixedWidth(
     StreamString &response, NativeRegisterContextSP &reg_ctx_sp,
-    const RegisterInfo &reg_info, const RegisterValue *reg_value_p) {
+    const RegisterInfo &reg_info, const RegisterValue *reg_value_p,
+    lldb::ByteOrder byte_order) {
   RegisterValue reg_value;
   if (!reg_value_p) {
     Error error = reg_ctx_sp->ReadRegister(&reg_info, reg_value);
     if (error.Success())
       reg_value_p = &reg_value;
     // else log.
   }
 
+  bool little_endian = byte_order == lldb::eByteOrderLittle;
   if (reg_value_p) {
     AppendHexValue(response, (const uint8_t *)reg_value_p->GetBytes(),
-                   reg_value_p->GetByteSize(), false);
+                   reg_value_p->GetByteSize(), little_endian);
   } else {
     // Zero-out any unreadable values.
     if (reg_info.byte_size > 0) {
@@ -436,6 +438,13 @@
   }
 }
 
+static void WriteRegisterValueInHexFixedWidth(
+    StreamString &response, NativeRegisterContextSP &reg_ctx_sp,
+    const RegisterInfo &reg_info, const RegisterValue *reg_value_p) {
+  WriteRegisterValueInHexFixedWidth(response, reg_ctx_sp, reg_info,
+      reg_value_p, lldb::eByteOrderBig);
+}
+
 static JSONObject::SP GetRegistersAsJSON(NativeThreadProtocol &thread,
                                          bool abridged) {
   Log *log(GetLogIfAnyCategoriesSet(LIBLLDB_LOG_THREAD));
@@ -570,6 +579,7 @@
     if (JSONObject::SP registers_sp = GetRegistersAsJSON(*thread_sp, abridged))
       thread_obj_sp->SetObject("registers", registers_sp);
 
+
     thread_obj_sp->SetObject("tid", std::make_shared<JSONNumber>(tid));
     if (signum != 0)
       thread_obj_sp->SetObject("signal", std::make_shared<JSONNumber>(signum));
@@ -721,6 +731,41 @@
                     "jstopinfo field for pid %" PRIu64,
                     __FUNCTION__, m_debugged_process_sp->GetID());
     }
+
+    uint32_t i = 0;
+    ByteOrder byte_order = endian::InlHostByteOrder();
+    response.PutCString("thread-pcs");
+    char delimiter = ':';
+    for (NativeThreadProtocolSP thread_sp;
+        (thread_sp = m_debugged_process_sp->GetThreadAtIndex(i)) != nullptr;
+        ++i) {
+      NativeRegisterContextSP reg_ctx_sp = thread_sp->GetRegisterContext();
+      if (!reg_ctx_sp)
+        continue;
+
+      uint32_t reg_to_read = reg_ctx_sp->ConvertRegisterKindToRegisterNumber(
+          eRegisterKindGeneric, LLDB_REGNUM_GENERIC_PC);
+      const RegisterInfo* const reg_info_p =
+        reg_ctx_sp->GetRegisterInfoAtIndex(reg_to_read);
+
+      RegisterValue reg_value;
+      Error error = reg_ctx_sp->ReadRegister(reg_info_p, reg_value);
+      if (error.Fail()) {
+        if (log)
+          log->Printf("%s failed to read register '%s' index %" PRIu32 ": %s",
+                      __FUNCTION__,
+                      reg_info_p->name ? reg_info_p->name : "<unnamed-register>",
+                      reg_to_read, error.AsCString());
+        continue;
+      }
+
+      response.PutChar(delimiter);
+      delimiter = ',';
+      WriteRegisterValueInHexFixedWidth(response, reg_ctx_sp, *reg_info_p,
+                                        &reg_value, byte_order);
+    }
+
+    response.PutChar(';');
   }
 
   //


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