diff options
Diffstat (limited to 'lldb/source/Plugins/Process/gdb-remote/GDBRemoteCommunicationClient.cpp')
| -rw-r--r-- | lldb/source/Plugins/Process/gdb-remote/GDBRemoteCommunicationClient.cpp | 87 |
1 files changed, 87 insertions, 0 deletions
diff --git a/lldb/source/Plugins/Process/gdb-remote/GDBRemoteCommunicationClient.cpp b/lldb/source/Plugins/Process/gdb-remote/GDBRemoteCommunicationClient.cpp index fe88de4c866..f487ae94192 100644 --- a/lldb/source/Plugins/Process/gdb-remote/GDBRemoteCommunicationClient.cpp +++ b/lldb/source/Plugins/Process/gdb-remote/GDBRemoteCommunicationClient.cpp @@ -33,6 +33,7 @@ #include "lldb/Host/HostInfo.h" #include "lldb/Host/StringConvert.h" #include "lldb/Host/TimeValue.h" +#include "lldb/Symbol/Symbol.h" #include "lldb/Target/Target.h" #include "lldb/Target/MemoryRegionInfo.h" #include "lldb/Target/UnixSignals.h" @@ -98,6 +99,7 @@ GDBRemoteCommunicationClient::GDBRemoteCommunicationClient() : m_supports_z4 (true), m_supports_QEnvironment (true), m_supports_QEnvironmentHexEncoded (true), + m_supports_qSymbol (true), m_curr_pid (LLDB_INVALID_PROCESS_ID), m_curr_tid (LLDB_INVALID_THREAD_ID), m_curr_tid_run (LLDB_INVALID_THREAD_ID), @@ -370,6 +372,7 @@ GDBRemoteCommunicationClient::ResetDiscoverableSettings() m_supports_z4 = true; m_supports_QEnvironment = true; m_supports_QEnvironmentHexEncoded = true; + m_supports_qSymbol = true; m_host_arch.Clear(); m_process_arch.Clear(); @@ -4241,3 +4244,87 @@ GDBRemoteCommunicationClient::ReadExtFeature (const lldb_private::ConstString ob err.Success( ); return true; } + +// Notify the target that gdb is prepared to serve symbol lookup requests. +// packet: "qSymbol::" +// reply: +// OK The target does not need to look up any (more) symbols. +// qSymbol:<sym_name> The target requests the value of symbol sym_name (hex encoded). +// LLDB may provide the value by sending another qSymbol packet +// in the form of"qSymbol:<sym_value>:<sym_name>". + +void +GDBRemoteCommunicationClient::ServeSymbolLookups(lldb_private::Process *process) +{ + if (m_supports_qSymbol) + { + Mutex::Locker locker; + if (GetSequenceMutex(locker, "GDBRemoteCommunicationClient::ServeSymbolLookups() failed due to not getting the sequence mutex")) + { + StreamString packet; + packet.PutCString ("qSymbol::"); + while (1) + { + StringExtractorGDBRemote response; + if (SendPacketAndWaitForResponseNoLock(packet.GetData(), packet.GetSize(), response) == PacketResult::Success) + { + if (response.IsOKResponse()) + { + // We are done serving symbols requests + return; + } + + if (response.IsUnsupportedResponse()) + { + // qSymbol is not supported by the current GDB server we are connected to + m_supports_qSymbol = false; + return; + } + else + { + llvm::StringRef response_str(response.GetStringRef()); + if (response_str.startswith("qSymbol:")) + { + response.SetFilePos(strlen("qSymbol:")); + std::string symbol_name; + if (response.GetHexByteString(symbol_name)) + { + if (symbol_name.empty()) + return; + + addr_t symbol_load_addr = LLDB_INVALID_ADDRESS; + lldb_private::SymbolContextList sc_list; + if (process->GetTarget().GetImages().FindSymbolsWithNameAndType(ConstString(symbol_name), eSymbolTypeAny, sc_list)) + { + SymbolContext sc; + if (sc_list.GetContextAtIndex(0, sc)) + { + if (sc.symbol) + symbol_load_addr = sc.symbol->GetAddress().GetLoadAddress(&process->GetTarget()); + } + } + // This is the normal path where our symbol lookup was successful and we want + // to send a packet with the new symbol value and see if another lookup needs to be + // done. + + // Change "packet" to contain the requested symbol value and name + packet.Clear(); + packet.PutCString("qSymbol:"); + if (symbol_load_addr != LLDB_INVALID_ADDRESS) + packet.Printf("%" PRIx64, symbol_load_addr); + packet.PutCString(":"); + packet.PutBytesAsRawHex8(symbol_name.data(), symbol_name.size()); + continue; // go back to the while loop and send "packet" and wait for another response + } + } + } + } + } + // If we make it here, the symbol request packet response wasn't valid or + // our symbol lookup failed so we must abort + return; + + } + } +} + |
