Use allocated buffer for CONTEXT

Author: ssbssa

gdb/nat/windows-nat.c

@@ -241,6 +241,23 @@ windows_process_info::pid_to_exec_file (int pid)
   return path;
 }
 
+void windows_process_info::initialize_context (windows_thread_info *th)
+{
+#ifdef __x86_64__
+  if (wow64_process)
+    {
+      th->context_buffer.reset (xmalloc (sizeof (WOW64_CONTEXT)));
+      th->wow64_context = (WOW64_CONTEXT *) th->context_buffer.get ();
+    }
+#endif
+  else
+    {
+      th->context_buffer.reset (xmalloc (sizeof (CONTEXT)));
+      th->context = (CONTEXT *) th->context_buffer.get ();
+    }
+  *context_flags_ptr (th) = 0;
+}
+
 static std::string
 win32_xfer_osdata_processes ()
 {

gdb/nat/windows-nat.h

@@ -80,9 +80,9 @@ struct windows_thread_info
   /* The context of the thread, including any manipulations.  */
   union
   {
-    CONTEXT context {};
+    CONTEXT *context = nullptr;
 #ifdef __x86_64__
-    WOW64_CONTEXT wow64_context;
+    WOW64_CONTEXT *wow64_context;
 #endif
   };
 
@@ -105,6 +105,8 @@ struct windows_thread_info
 
   /* The name of the thread.  */
   gdb::unique_xmalloc_ptr<char> name;
+
+  gdb::unique_xmalloc_ptr<void> context_buffer;
 };
 
 
@@ -256,15 +258,17 @@ struct windows_process_info
 
   const char *pid_to_exec_file (int);
 
+  void initialize_context (windows_thread_info *th);
+
   template<typename Function>
   auto with_context (windows_thread_info *th, Function function)
   {
 #ifdef __x86_64__
     if (wow64_process)
-      return function (th != nullptr ? &th->wow64_context : nullptr);
+      return function (th != nullptr ? th->wow64_context : nullptr);
     else
 #endif
-      return function (th != nullptr ? &th->context : nullptr);
+      return function (th != nullptr ? th->context : nullptr);
   }
 
   DWORD *context_flags_ptr (windows_thread_info *th)

gdb/windows-nat.c

@@ -643,6 +643,7 @@ windows_nat_target::add_thread (ptid_t ptid, HANDLE h, void *tlb,
     base += 0x2000;
 #endif
   th = new windows_thread_info (ptid.lwp (), h, base);
+  windows_process.initialize_context (th);
   windows_process.thread_list.emplace_back (th);
 
   /* Add this new thread to the list of threads.

gdbserver/win32-i386-low.cc

@@ -284,6 +284,8 @@ static void
 i386_thread_added (windows_thread_info *th)
 {
   th->debug_registers_changed = true;
+
+  windows_process.initialize_context (th);
 }
 
 static void