Vendor import of lldb trunk r256945:

https://llvm.org/svn/llvm-project/lldb/trunk@256945

1 files changed, 211 insertions, 0 deletions

diff --git a/source/Plugins/Process/MacOSX-Kernel/ThreadKDP.cpp b/source/Plugins/Process/MacOSX-Kernel/ThreadKDP.cpp
new file mode 100644
index 0000000..3b8bed1
--- /dev/null
+++ b/source/Plugins/Process/MacOSX-Kernel/ThreadKDP.cpp
@@ -0,0 +1,211 @@
+//===-- ThreadKDP.cpp -------------------------------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+
+#include "ThreadKDP.h"
+
+#include "lldb/Utility/SafeMachO.h"
+
+#include "lldb/Core/ArchSpec.h"
+#include "lldb/Core/DataExtractor.h"
+#include "lldb/Core/StreamString.h"
+#include "lldb/Core/State.h"
+#include "lldb/Target/Process.h"
+#include "lldb/Target/RegisterContext.h"
+#include "lldb/Target/StopInfo.h"
+#include "lldb/Target/Target.h"
+#include "lldb/Target/Unwind.h"
+#include "lldb/Breakpoint/Watchpoint.h"
+
+#include "ProcessKDP.h"
+#include "ProcessKDPLog.h"
+#include "RegisterContextKDP_arm.h"
+#include "RegisterContextKDP_arm64.h"
+#include "RegisterContextKDP_i386.h"
+#include "RegisterContextKDP_x86_64.h"
+#include "Plugins/Process/Utility/StopInfoMachException.h"
+
+using namespace lldb;
+using namespace lldb_private;
+
+//----------------------------------------------------------------------
+// Thread Registers
+//----------------------------------------------------------------------
+
+ThreadKDP::ThreadKDP (Process &process, lldb::tid_t tid) :
+    Thread(process, tid),
+    m_thread_name (),
+    m_dispatch_queue_name (),
+    m_thread_dispatch_qaddr (LLDB_INVALID_ADDRESS)
+{
+    ProcessKDPLog::LogIf(KDP_LOG_THREAD, "%p: ThreadKDP::ThreadKDP (tid = 0x%4.4x)", this, GetID());
+}
+
+ThreadKDP::~ThreadKDP ()
+{
+    ProcessKDPLog::LogIf(KDP_LOG_THREAD, "%p: ThreadKDP::~ThreadKDP (tid = 0x%4.4x)", this, GetID());
+    DestroyThread();
+}
+
+const char *
+ThreadKDP::GetName ()
+{
+    if (m_thread_name.empty())
+        return NULL;
+    return m_thread_name.c_str();
+}
+
+const char *
+ThreadKDP::GetQueueName ()
+{
+    return NULL;
+}
+
+void
+ThreadKDP::RefreshStateAfterStop()
+{
+    // Invalidate all registers in our register context. We don't set "force" to
+    // true because the stop reply packet might have had some register values
+    // that were expedited and these will already be copied into the register
+    // context by the time this function gets called. The KDPRegisterContext
+    // class has been made smart enough to detect when it needs to invalidate
+    // which registers are valid by putting hooks in the register read and 
+    // register supply functions where they check the process stop ID and do
+    // the right thing.
+    const bool force = false;
+    lldb::RegisterContextSP reg_ctx_sp (GetRegisterContext());
+    if (reg_ctx_sp)
+        reg_ctx_sp->InvalidateIfNeeded (force);
+}
+
+bool
+ThreadKDP::ThreadIDIsValid (lldb::tid_t thread)
+{
+    return thread != 0;
+}
+
+void
+ThreadKDP::Dump(Log *log, uint32_t index)
+{
+}
+
+
+bool
+ThreadKDP::ShouldStop (bool &step_more)
+{
+    return true;
+}
+lldb::RegisterContextSP
+ThreadKDP::GetRegisterContext ()
+{
+    if (m_reg_context_sp.get() == NULL)
+        m_reg_context_sp = CreateRegisterContextForFrame (NULL);
+    return m_reg_context_sp;
+}
+
+lldb::RegisterContextSP
+ThreadKDP::CreateRegisterContextForFrame (StackFrame *frame)
+{
+    lldb::RegisterContextSP reg_ctx_sp;
+    uint32_t concrete_frame_idx = 0;
+    
+    if (frame)
+        concrete_frame_idx = frame->GetConcreteFrameIndex ();
+
+    if (concrete_frame_idx == 0)
+    {
+        ProcessSP process_sp (CalculateProcess());
+        if (process_sp)
+        {
+            switch (static_cast<ProcessKDP *>(process_sp.get())->GetCommunication().GetCPUType())
+            {
+                case llvm::MachO::CPU_TYPE_ARM:
+                    reg_ctx_sp.reset (new RegisterContextKDP_arm (*this, concrete_frame_idx));
+                    break;
+                case llvm::MachO::CPU_TYPE_ARM64:
+                    reg_ctx_sp.reset (new RegisterContextKDP_arm64 (*this, concrete_frame_idx));
+                    break;
+                case llvm::MachO::CPU_TYPE_I386:
+                    reg_ctx_sp.reset (new RegisterContextKDP_i386 (*this, concrete_frame_idx));
+                    break;
+                case llvm::MachO::CPU_TYPE_X86_64:
+                    reg_ctx_sp.reset (new RegisterContextKDP_x86_64 (*this, concrete_frame_idx));
+                    break;
+                default:
+                    assert (!"Add CPU type support in KDP");
+                    break;
+            }
+        }
+    }
+    else
+    {
+        Unwind *unwinder = GetUnwinder ();
+        if (unwinder)
+            reg_ctx_sp = unwinder->CreateRegisterContextForFrame (frame);
+    }
+    return reg_ctx_sp;
+}
+
+bool
+ThreadKDP::CalculateStopInfo ()
+{
+    ProcessSP process_sp (GetProcess());
+    if (process_sp)
+    {
+        if (m_cached_stop_info_sp)
+        {
+            SetStopInfo (m_cached_stop_info_sp);
+        }
+        else
+        {
+            SetStopInfo(StopInfo::CreateStopReasonWithSignal (*this, SIGSTOP));
+        }
+        return true;
+    }
+    return false;
+}
+
+void
+ThreadKDP::SetStopInfoFrom_KDP_EXCEPTION (const DataExtractor &exc_reply_packet)
+{
+    lldb::offset_t offset = 0;
+    uint8_t reply_command = exc_reply_packet.GetU8(&offset);
+    if (reply_command == CommunicationKDP::KDP_EXCEPTION)
+    {
+        offset = 8;
+        const uint32_t count = exc_reply_packet.GetU32 (&offset);
+        if (count >= 1)
+        {
+            //const uint32_t cpu = exc_reply_packet.GetU32 (&offset);
+            offset += 4; // Skip the useless CPU field
+            const uint32_t exc_type = exc_reply_packet.GetU32 (&offset);
+            const uint32_t exc_code = exc_reply_packet.GetU32 (&offset);
+            const uint32_t exc_subcode = exc_reply_packet.GetU32 (&offset);
+            // We have to make a copy of the stop info because the thread list
+            // will iterate through the threads and clear all stop infos..
+            
+            // Let the StopInfoMachException::CreateStopReasonWithMachException()
+            // function update the PC if needed as we might hit a software breakpoint
+            // and need to decrement the PC (i386 and x86_64 need this) and KDP
+            // doesn't do this for us.
+            const bool pc_already_adjusted = false;
+            const bool adjust_pc_if_needed = true;
+
+            m_cached_stop_info_sp = StopInfoMachException::CreateStopReasonWithMachException (*this,
+                                                                                              exc_type,
+                                                                                              2,
+                                                                                              exc_code,
+                                                                                              exc_subcode,
+                                                                                              0,
+                                                                                              pc_already_adjusted,
+                                                                                              adjust_pc_if_needed);            
+        }
+    }
+}
+