Implement the "qSymbol" packet in order to be able to read queue information in debugserver and return the info in the stop reply packets.
A "qSymbol::" is sent when shared libraries have been loaded by hooking into the Process::ModulesDidLoad() function from within ProcessGDBRemote. This function was made virtual so that the ProcessGDBRemote version is called, which then first calls the Process::ModulesDidLoad(), and then it queries for any symbol lookups that the remote GDB server might want to do.
This allows debugserver to request the "dispatch_queue_offsets" symbol so that it can read the queue name, queue kind and queue serial number and include this data as part of the stop reply packet. Previously each thread would have to do 3 memory reads in order to read the queue name.
This is part of reducing the number of packets that are sent between LLDB and the remote GDB server.
<rdar://problem/21494354>
llvm-svn: 240466
diff --git a/lldb/tools/debugserver/source/DNB.h b/lldb/tools/debugserver/source/DNB.h
index e57bb08..3f03279 100644
--- a/lldb/tools/debugserver/source/DNB.h
+++ b/lldb/tools/debugserver/source/DNB.h
@@ -69,6 +69,10 @@
nub_bool_t DNBProcessKill (nub_process_t pid) DNB_EXPORT;
nub_bool_t DNBProcessSendEvent (nub_process_t pid, const char *event) DNB_EXPORT;
nub_size_t DNBProcessMemoryRead (nub_process_t pid, nub_addr_t addr, nub_size_t size, void *buf) DNB_EXPORT;
+uint64_t DNBProcessMemoryReadInteger (nub_process_t pid, nub_addr_t addr, nub_size_t integer_size, uint64_t fail_value) DNB_EXPORT;
+nub_addr_t DNBProcessMemoryReadPointer (nub_process_t pid, nub_addr_t addr) DNB_EXPORT;
+std::string DNBProcessMemoryReadCString (nub_process_t pid, nub_addr_t addr) DNB_EXPORT;
+std::string DNBProcessMemoryReadCStringFixed (nub_process_t pid, nub_addr_t addr, nub_size_t fixed_length) DNB_EXPORT;
nub_size_t DNBProcessMemoryWrite (nub_process_t pid, nub_addr_t addr, nub_size_t size, const void *buf) DNB_EXPORT;
nub_addr_t DNBProcessMemoryAllocate (nub_process_t pid, nub_size_t size, uint32_t permissions) DNB_EXPORT;
nub_bool_t DNBProcessMemoryDeallocate (nub_process_t pid, nub_addr_t addr) DNB_EXPORT;