x86-nat: Add x86_lookup_debug_reg_state.

This function returns nullptr if debug register state does not yet
exist for a given process rather than creating new state.

diff --git a/gdb/x86-nat.c b/gdb/x86-nat.c
index c1e892bf56421b194d85ba657a05649334b68b8e..36513dd8cfb0c65497123ae5a75be58dd502db1a 100644 (file)
--- a/gdb/x86-nat.c
+++ b/gdb/x86-nat.c
@@ -46,6 +46,18 @@ struct x86_dr_low_type x86_dr_low;
 static std::unordered_map<pid_t,
                          struct x86_debug_reg_state> x86_debug_process_state;
 
+/* See x86-nat.h.  */
+
+struct x86_debug_reg_state *
+x86_lookup_debug_reg_state (pid_t pid)
+{
+  auto it = x86_debug_process_state.find (pid);
+  if (it != x86_debug_process_state.end ())
+    return &it->second;
+
+  return nullptr;
+}
+
 /* Get debug registers state for process PID.  */
 
 struct x86_debug_reg_state *

diff --git a/gdb/x86-nat.h b/gdb/x86-nat.h
index 913291a23052a6dfb59351152b1430848f7035eb..d9c2a3f6e14ed7c8a099e63c258aede33b2f10d7 100644 (file)
--- a/gdb/x86-nat.h
+++ b/gdb/x86-nat.h
@@ -40,6 +40,11 @@ extern void x86_set_debug_register_length (int len);
 
 extern void x86_cleanup_dregs (void);
 
+/* Return the debug register state for process PID.  If no existing
+   state is found for this process, return nullptr.  */
+
+struct x86_debug_reg_state *x86_lookup_debug_reg_state (pid_t pid);
+
 /* Called whenever GDB is no longer debugging process PID.  It deletes
    data structures that keep track of debug register state.  */