[Lldb-commits] [PATCH] D84257: [lldb] Don't use hardware index to determine whether a breakpoint site is hardware

[Tatyana Krasnukha via Phabricator via lldb-commits]

tatyana-krasnukha created this revision.
tatyana-krasnukha added reviewers: clayborg, labath, JDevlieghere.
tatyana-krasnukha added a project: LLDB.
Herald added subscribers: lldb-commits, arphaman.

Most process plugins (if not all) don't set hardware index for breakpoints. 
They even are not able to determine this index.
This patch makes StoppointLocation::IsHardware pure virtual and lets 
BreakpointSite override it using more accurate BreakpointSite::Type.

It also adds assertions to be sure that a breakpoint site is hardware when this 
is required.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D84257

Files:
  lldb/include/lldb/Breakpoint/BreakpointLocation.h
  lldb/include/lldb/Breakpoint/BreakpointSite.h
  lldb/include/lldb/Breakpoint/StoppointLocation.h
  lldb/source/Breakpoint/BreakpointLocation.cpp
  lldb/source/Breakpoint/Watchpoint.cpp
  lldb/source/Plugins/Process/gdb-remote/ProcessGDBRemote.cpp


Index: lldb/source/Plugins/Process/gdb-remote/ProcessGDBRemote.cpp
===================================================================
--- lldb/source/Plugins/Process/gdb-remote/ProcessGDBRemote.cpp
+++ lldb/source/Plugins/Process/gdb-remote/ProcessGDBRemote.cpp
@@ -3205,14 +3205,8 @@
       break;
 
     case BreakpointSite::eExternal: {
-      GDBStoppointType stoppoint_type;
-      if (bp_site->IsHardware())
-        stoppoint_type = eBreakpointHardware;
-      else
-        stoppoint_type = eBreakpointSoftware;
-
-      if (m_gdb_comm.SendGDBStoppointTypePacket(stoppoint_type, false, addr,
-                                                bp_op_size))
+      if (m_gdb_comm.SendGDBStoppointTypePacket(eBreakpointSoftware, false,
+                                                addr, bp_op_size))
         error.SetErrorToGenericError();
     } break;
     }
Index: lldb/source/Breakpoint/Watchpoint.cpp
===================================================================
--- lldb/source/Breakpoint/Watchpoint.cpp
+++ lldb/source/Breakpoint/Watchpoint.cpp
@@ -95,7 +95,10 @@
 
 // Override default impl of StoppointLocation::IsHardware() since m_is_hardware
 // member field is more accurate.
-bool Watchpoint::IsHardware() const { return m_is_hardware; }
+bool Watchpoint::IsHardware() const {
+  lldbassert(m_is_hardware || !HardwareRequired());
+  return m_is_hardware;
+}
 
 bool Watchpoint::IsWatchVariable() const { return m_is_watch_variable; }
 
Index: lldb/source/Breakpoint/BreakpointLocation.cpp
===================================================================
--- lldb/source/Breakpoint/BreakpointLocation.cpp
+++ lldb/source/Breakpoint/BreakpointLocation.cpp
@@ -68,6 +68,14 @@
 
 Target &BreakpointLocation::GetTarget() { return m_owner.GetTarget(); }
 
+bool BreakpointLocation::IsHardware() const {
+  if (m_bp_site_sp)
+    return m_bp_site_sp->IsHardware();
+
+  // If breakpoint location is not resolved yet, it cannot be hardware.
+  return false;
+}
+
 bool BreakpointLocation::IsEnabled() const {
   if (!m_owner.IsEnabled())
     return false;
Index: lldb/include/lldb/Breakpoint/StoppointLocation.h
===================================================================
--- lldb/include/lldb/Breakpoint/StoppointLocation.h
+++ lldb/include/lldb/Breakpoint/StoppointLocation.h
@@ -40,9 +40,7 @@
 
   bool HardwareRequired() const { return m_hardware; }
 
-  virtual bool IsHardware() const {
-    return m_hardware_index != LLDB_INVALID_INDEX32;
-  }
+  virtual bool IsHardware() const = 0;
 
   virtual bool ShouldStop(StoppointCallbackContext *context) { return true; }
 
Index: lldb/include/lldb/Breakpoint/BreakpointSite.h
===================================================================
--- lldb/include/lldb/Breakpoint/BreakpointSite.h
+++ lldb/include/lldb/Breakpoint/BreakpointSite.h
@@ -15,6 +15,7 @@
 
 #include "lldb/Breakpoint/BreakpointLocationCollection.h"
 #include "lldb/Breakpoint/StoppointLocation.h"
+#include "lldb/Utility/LLDBAssert.h"
 #include "lldb/Utility/UserID.h"
 #include "lldb/lldb-forward.h"
 
@@ -184,6 +185,12 @@
   ///     \b false otherwise.
   bool IsInternal() const;
 
+  bool IsHardware() const override {
+    lldbassert(BreakpointSite::Type::eHardware == GetType() ||
+               !HardwareRequired());
+    return BreakpointSite::Type::eHardware == GetType();
+  }
+
   BreakpointSite::Type GetType() const { return m_type; }
 
   void SetType(BreakpointSite::Type type) { m_type = type; }
Index: lldb/include/lldb/Breakpoint/BreakpointLocation.h
===================================================================
--- lldb/include/lldb/Breakpoint/BreakpointLocation.h
+++ lldb/include/lldb/Breakpoint/BreakpointLocation.h
@@ -76,6 +76,12 @@
   ///     \b true if the breakpoint is enabled, \b false if disabled.
   bool IsEnabled() const;
 
+  /// Check if it is a hardware breakpoint.
+  ///
+  /// \return
+  ///     \b true if the breakpoint is a harware breakpoint.
+  bool IsHardware() const override;
+
   /// If \a auto_continue is \b true, set the breakpoint to continue when hit.
   void SetAutoContinue(bool auto_continue);
 

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