PPCSymbolDB: GetDescription by std::string_view

Should save a lot of deep copies.

Source/Core/Core/Debugger/DebugInterface.h

@@ -6,6 +6,7 @@
 #include <cstddef>
 #include <optional>
 #include <string>
+#include <string_view>
 #include <vector>
 
 #include "Common/CommonTypes.h"
@@ -103,7 +104,7 @@ public:
   {
     return 0xFFFFFFFF;
   }
-  virtual std::string GetDescription(u32 /*address*/) const = 0;
+  virtual std::string_view GetDescription(u32 /*address*/) const = 0;
   virtual void Clear(const CPUThreadGuard& guard) = 0;
 };
 }  // namespace Core

Source/Core/Core/Debugger/Debugger_SymbolMap.cpp

@@ -79,7 +79,7 @@ bool GetCallstack(const Core::CPUThreadGuard& guard, std::vector<CallstackEntry>
   });
 
   WalkTheStack(guard, [&output, &ppc_symbol_db](u32 func_addr) {
-    std::string func_desc = ppc_symbol_db.GetDescription(func_addr);
+    std::string_view func_desc = ppc_symbol_db.GetDescription(func_addr);
     if (func_desc.empty() || func_desc == "Invalid")
       func_desc = "(unknown)";
 
@@ -106,14 +106,14 @@ void PrintCallstack(const Core::CPUThreadGuard& guard, Common::Log::LogType type
     GENERIC_LOG_FMT(type, level, " LR = 0 - this is bad");
   }
 
-  if (ppc_symbol_db.GetDescription(ppc_state.pc) != ppc_symbol_db.GetDescription(LR(ppc_state)))
+  if (const std::string_view lr_desc = ppc_symbol_db.GetDescription(LR(ppc_state));
+      lr_desc != ppc_symbol_db.GetDescription(ppc_state.pc))
   {
-    GENERIC_LOG_FMT(type, level, " * {}  [ LR = {:08x} ]",
+    GENERIC_LOG_FMT(type, level, " * {}  [ LR = {:08x} ]", lr_desc, LR(ppc_state));
-                    ppc_symbol_db.GetDescription(LR(ppc_state)), LR(ppc_state));
   }
 
   WalkTheStack(guard, [type, level, &ppc_symbol_db](u32 func_addr) {
-    std::string func_desc = ppc_symbol_db.GetDescription(func_addr);
+    std::string_view func_desc = ppc_symbol_db.GetDescription(func_addr);
     if (func_desc.empty() || func_desc == "Invalid")
       func_desc = "(unknown)";
     GENERIC_LOG_FMT(type, level, " * {} [ addr = {:08x} ]", func_desc, func_addr);

Source/Core/Core/Debugger/PPCDebugInterface.cpp

@@ -442,7 +442,7 @@ u32 PPCDebugInterface::GetColor(const Core::CPUThreadGuard* guard, u32 address)
 }
 // =============
 
-std::string PPCDebugInterface::GetDescription(u32 address) const
+std::string_view PPCDebugInterface::GetDescription(u32 address) const
 {
   return m_ppc_symbol_db.GetDescription(address);
 }

Source/Core/Core/Debugger/PPCDebugInterface.h

@@ -102,7 +102,7 @@ public:
   void Step() override {}
   void RunToBreakpoint() override;
   u32 GetColor(const Core::CPUThreadGuard* guard, u32 address) const override;
-  std::string GetDescription(u32 address) const override;
+  std::string_view GetDescription(u32 address) const override;
 
   std::shared_ptr<Core::NetworkCaptureLogger> NetworkLogger();
 

Source/Core/Core/PowerPC/PPCSymbolDB.cpp

@@ -108,12 +108,10 @@ Common::Symbol* PPCSymbolDB::GetSymbolFromAddr(u32 addr)
   return nullptr;
 }
 
-std::string PPCSymbolDB::GetDescription(u32 addr)
+std::string_view PPCSymbolDB::GetDescription(u32 addr)
 {
-  Common::Symbol* symbol = GetSymbolFromAddr(addr);
+  if (const Common::Symbol* const symbol = GetSymbolFromAddr(addr))
-  if (symbol)
     return symbol->name;
-  else
   return " --- ";
 }
 

Source/Core/Core/PowerPC/PPCSymbolDB.h

@@ -4,6 +4,7 @@
 #pragma once
 
 #include <string>
+#include <string_view>
 
 #include "Common/CommonTypes.h"
 #include "Common/SymbolDB.h"
@@ -27,7 +28,7 @@ public:
 
   Common::Symbol* GetSymbolFromAddr(u32 addr) override;
 
-  std::string GetDescription(u32 addr);
+  std::string_view GetDescription(u32 addr);
 
   void FillInCallers();
 

Source/Core/DolphinQt/CMakeLists.txt

@@ -303,6 +303,7 @@ add_executable(dolphin-emu
   QtUtils/ElidedButton.h
   QtUtils/FileOpenEventFilter.cpp
   QtUtils/FileOpenEventFilter.h
+  QtUtils/FromStdString.h
   QtUtils/ImageConverter.cpp
   QtUtils/ImageConverter.h
   QtUtils/ModalMessageBox.cpp

Source/Core/DolphinQt/Debugger/BreakpointWidget.cpp

@@ -193,11 +193,8 @@ void BreakpointWidget::Update()
     m_table->setItem(i, 0, active);
     m_table->setItem(i, 1, create_item(QStringLiteral("BP")));
 
-    if (ppc_symbol_db.GetSymbolFromAddr(bp.address))
+    if (const Common::Symbol* const symbol = ppc_symbol_db.GetSymbolFromAddr(bp.address))
-    {
+      m_table->setItem(i, 2, create_item(QString::fromStdString(symbol->name)));
-      m_table->setItem(
-          i, 2, create_item(QString::fromStdString(ppc_symbol_db.GetDescription(bp.address))));
-    }
 
     m_table->setItem(i, 3,
                      create_item(QStringLiteral("%1").arg(bp.address, 8, 16, QLatin1Char('0'))));
@@ -234,12 +231,8 @@ void BreakpointWidget::Update()
     m_table->setItem(i, 0, active);
     m_table->setItem(i, 1, create_item(QStringLiteral("MBP")));
 
-    if (ppc_symbol_db.GetSymbolFromAddr(mbp.start_address))
+    if (const Common::Symbol* const symbol = ppc_symbol_db.GetSymbolFromAddr(mbp.start_address))
-    {
+      m_table->setItem(i, 2, create_item(QString::fromStdString(symbol->name)));
-      m_table->setItem(
-          i, 2,
-          create_item(QString::fromStdString(ppc_symbol_db.GetDescription(mbp.start_address))));
-    }
 
     if (mbp.is_ranged)
     {

Source/Core/DolphinQt/Debugger/CodeViewWidget.cpp

@@ -38,6 +38,7 @@
 #include "DolphinQt/Debugger/AssembleInstructionDialog.h"
 #include "DolphinQt/Debugger/PatchInstructionDialog.h"
 #include "DolphinQt/Host.h"
+#include "DolphinQt/QtUtils/FromStdString.h"
 #include "DolphinQt/QtUtils/SetWindowDecorations.h"
 #include "DolphinQt/Resources.h"
 #include "DolphinQt/Settings.h"
@@ -326,7 +327,7 @@ void CodeViewWidget::Update(const Core::CPUThreadGuard* guard)
 
     std::string ins = (split == std::string::npos ? disas : disas.substr(0, split));
     std::string param = (split == std::string::npos ? "" : disas.substr(split + 1));
-    std::string desc = debug_interface.GetDescription(addr);
+    const std::string_view desc = debug_interface.GetDescription(addr);
 
     // Adds whitespace and a minimum size to ins and param. Helps to prevent frequent resizing while
     // scrolling.
@@ -334,7 +335,7 @@ void CodeViewWidget::Update(const Core::CPUThreadGuard* guard)
         QStringLiteral("%1").arg(QString::fromStdString(ins), -7, QLatin1Char(' '));
     const QString param_formatted =
         QStringLiteral("%1").arg(QString::fromStdString(param), -19, QLatin1Char(' '));
-    const QString desc_formatted = QStringLiteral("%1   ").arg(QString::fromStdString(desc));
+    const QString desc_formatted = QStringLiteral("%1   ").arg(QtUtils::FromStdString(desc));
 
     auto* ins_item = new QTableWidgetItem(ins_formatted);
     auto* param_item = new QTableWidgetItem(param_formatted);
@@ -374,7 +375,7 @@ void CodeViewWidget::Update(const Core::CPUThreadGuard* guard)
       branch.is_link = IsBranchInstructionWithLink(ins);
 
       description_item->setText(
-          tr("--> %1").arg(QString::fromStdString(debug_interface.GetDescription(branch_addr))));
+          tr("--> %1").arg(QtUtils::FromStdString(debug_interface.GetDescription(branch_addr))));
       param_item->setForeground(dark_theme ? QColor(255, 135, 255) : Qt::magenta);
     }
 

Source/Core/DolphinQt/Debugger/ThreadWidget.cpp

@@ -17,6 +17,7 @@
 #include "Core/PowerPC/PowerPC.h"
 #include "Core/System.h"
 #include "DolphinQt/Host.h"
+#include "DolphinQt/QtUtils/FromStdString.h"
 #include "DolphinQt/Settings.h"
 
 ThreadWidget::ThreadWidget(QWidget* parent) : QDockWidget(parent)
@@ -461,7 +462,7 @@ void ThreadWidget::UpdateThreadCallstack(const Core::CPUThreadGuard& guard,
       m_callstack_table->setItem(i, 2, new QTableWidgetItem(format_hex(lr_save)));
       m_callstack_table->setItem(
           i, 3,
-          new QTableWidgetItem(QString::fromStdString(
+          new QTableWidgetItem(QtUtils::FromStdString(
               guard.GetSystem().GetPowerPC().GetDebugInterface().GetDescription(lr_save))));
     }
     else

Source/Core/DolphinQt/DolphinQt.vcxproj

@@ -396,6 +396,7 @@
     <QtMoc Include="QtUtils\DoubleClickEventFilter.h" />
     <QtMoc Include="QtUtils\ElidedButton.h" />
     <QtMoc Include="QtUtils\FileOpenEventFilter.h" />
+    <ClInclude Include="QtUtils\FromStdString.h" />
     <QtMoc Include="QtUtils\ParallelProgressDialog.h" />
     <QtMoc Include="QtUtils\PartiallyClosableTabWidget.h" />
     <ClInclude Include="QtUtils\SetWindowDecorations.h" />

Source/Core/DolphinQt/QtUtils/FromStdString.h

@@ -0,0 +1,23 @@
+// Copyright 2024 Dolphin Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#pragma once
+
+#include <QString>
+#include <string_view>
+
+namespace QtUtils
+{
+inline QString FromStdString(std::string_view s)
+{
+  return QString::fromUtf8(s.data(), s.size());
+}
+inline QString FromStdString(std::u8string_view s)
+{
+  return QString::fromUtf8(s.data(), s.size());
+}
+inline QString FromStdString(std::u16string_view s)
+{
+  return QString::fromUtf16(s.data(), s.size());
+}
+}  // namespace QtUtils