Add logging and error reporting to Breakpoint Conditionals.

Source/Core/Core/PowerPC/Expression.cpp

@@ -5,6 +5,7 @@
 
 #include <algorithm>
 #include <cstdlib>
+#include <fmt/format.h>
 #include <optional>
 #include <string>
 #include <string_view>
@@ -14,6 +15,8 @@
 
 #include "Common/BitUtils.h"
 #include "Common/CommonTypes.h"
+#include "Common/Logging/Log.h"
+#include "Core/Core.h"
 #include "Core/PowerPC/MMU.h"
 #include "Core/PowerPC/PowerPC.h"
 
@@ -195,6 +198,8 @@ double Expression::Evaluate() const
 
   SynchronizeBindings(SynchronizeDirection::To);
 
+  Reporting(result);
+
   return result;
 }
 
@@ -235,6 +240,29 @@ void Expression::SynchronizeBindings(SynchronizeDirection dir) const
   }
 }
 
+void Expression::Reporting(const double result) const
+{
+  bool is_nan = std::isnan(result);
+  std::string message;
+
+  for (auto* v = m_vars->head; v != nullptr; v = v->next)
+  {
+    if (std::isnan(v->value))
+      is_nan = true;
+
+    fmt::format_to(std::back_inserter(message), "  {}={}", v->name, v->value);
+  }
+
+  if (is_nan)
+  {
+    message.append("\nBreakpoint condition encountered a NaN");
+    Core::DisplayMessage("Breakpoint condition has encountered a NaN.", 2000);
+  }
+
+  if (result != 0.0 || is_nan)
+    NOTICE_LOG_FMT(MEMMAP, "Breakpoint condition returned: {}. Vars:{}", result, message);
+}
+
 std::string Expression::GetText() const
 {
   return m_text;

Source/Core/Core/PowerPC/Expression.h

@@ -60,6 +60,7 @@ private:
   Expression(std::string_view text, ExprPointer ex, ExprVarListPointer vars);
 
   void SynchronizeBindings(SynchronizeDirection dir) const;
+  void Reporting(const double result) const;
 
   std::string m_text;
   ExprPointer m_expr;

Source/Core/DolphinQt/Debugger/NewBreakpointDialog.cpp

@@ -261,6 +261,11 @@ void NewBreakpointDialog::ShowConditionHelp()
       "p = r3 + 0x8, p == 0x8003510 && read_u32(p) != 0\n"
       "Write and break: r4 = 8, 1\n"
       "Write and continue: f3 = f1 + f2, 0\n"
-      "The condition must always be last\n");
+      "The condition must always be last\n\n"
+      "All variables will be printed in the Memory Interface log, if there's a hit or a NaN "
+      "result. To check for issues, assign a variable to your equation, so it can be printed.\n\n"
+      "Note: All values are internally converted to Doubles for calculations. It's possible for "
+      "them to go out of range or to become NaN. A warning will be given if NaN is returned, and "
+      "the var that became NaN will be logged.");
   ModalMessageBox::information(this, tr("Conditional help"), message);
 }