[lldb] Use templates to simplify {Get,Set}PropertyAtIndex (NFC)

Use templates to simplify {Get,Set}PropertyAtIndex. It has always
bothered me how cumbersome those calls are when adding new properties.
After this patch, SetPropertyAtIndex infers the type from its arguments
and GetPropertyAtIndex required a single template argument for the
return value. As an added benefit, this enables us to remove a bunch of
wrappers from UserSettingsController and OptionValueProperties.

Differential revision: https://reviews.llvm.org/D149774

4 files changed, 97 insertions, 47 deletions

diff --git a/lldb/include/lldb/Core/Debugger.h b/lldb/include/lldb/Core/Debugger.h
index a7487e159e2c..f05d8d4e6b23 100644
--- a/lldb/include/lldb/Core/Debugger.h
+++ b/lldb/include/lldb/Core/Debugger.h
@@ -269,7 +269,7 @@ public:
 
   const FormatEntity::Entry *GetFrameFormatUnique() const;
 
-  uint32_t GetStopDisassemblyMaxSize() const;
+  uint64_t GetStopDisassemblyMaxSize() const;
 
   const FormatEntity::Entry *GetThreadFormat() const;
 
@@ -283,7 +283,7 @@ public:
 
   bool SetREPLLanguage(lldb::LanguageType repl_lang);
 
-  uint32_t GetTerminalWidth() const;
+  uint64_t GetTerminalWidth() const;
 
   bool SetTerminalWidth(uint32_t term_width);
 
@@ -329,11 +329,11 @@ public:
 
   llvm::StringRef GetStopShowColumnAnsiSuffix() const;
 
-  uint32_t GetStopSourceLineCount(bool before) const;
+  uint64_t GetStopSourceLineCount(bool before) const;
 
   StopDisassemblyType GetStopDisassemblyDisplay() const;
 
-  uint32_t GetDisassemblyLineCount() const;
+  uint64_t GetDisassemblyLineCount() const;
 
   llvm::StringRef GetStopShowLineMarkerAnsiPrefix() const;
 
@@ -349,7 +349,7 @@ public:
 
   bool SetPrintDecls(bool b);
 
-  uint32_t GetTabSize() const;
+  uint64_t GetTabSize() const;
 
   bool SetTabSize(uint32_t tab_size);
 
diff --git a/lldb/include/lldb/Core/UserSettingsController.h b/lldb/include/lldb/Core/UserSettingsController.h
index 19b080d125a3..f320057ef120 100644
--- a/lldb/include/lldb/Core/UserSettingsController.h
+++ b/lldb/include/lldb/Core/UserSettingsController.h
@@ -9,6 +9,7 @@
 #ifndef LLDB_CORE_USERSETTINGSCONTROLLER_H
 #define LLDB_CORE_USERSETTINGSCONTROLLER_H
 
+#include "lldb/Interpreter/OptionValueProperties.h"
 #include "lldb/Utility/Status.h"
 #include "lldb/lldb-forward.h"
 #include "lldb/lldb-private-enumerations.h"
@@ -82,6 +83,27 @@ public:
 
   static bool IsSettingExperimental(llvm::StringRef setting);
 
+  template <typename T>
+  T GetPropertyAtIndexAs(uint32_t idx, T default_value,
+                         const ExecutionContext *exe_ctx = nullptr) const {
+    return m_collection_sp->GetPropertyAtIndexAs<T>(idx, exe_ctx)
+        .value_or(default_value);
+  }
+
+  template <typename T, typename U = typename std::remove_pointer<T>::type,
+            std::enable_if_t<std::is_pointer_v<T>, bool> = true>
+  const U *
+  GetPropertyAtIndexAs(uint32_t idx,
+                       const ExecutionContext *exe_ctx = nullptr) const {
+    return m_collection_sp->GetPropertyAtIndexAs<T>(idx, exe_ctx);
+  }
+
+  template <typename T>
+  bool SetPropertyAtIndex(uint32_t idx, T t,
+                          const ExecutionContext *exe_ctx = nullptr) const {
+    return m_collection_sp->SetPropertyAtIndex<T>(idx, t, exe_ctx);
+  }
+
 protected:
   lldb::OptionValuePropertiesSP m_collection_sp;
 };
diff --git a/lldb/include/lldb/Interpreter/OptionValue.h b/lldb/include/lldb/Interpreter/OptionValue.h
index 7d6ab6c3f6f5..eef7d67eb034 100644
--- a/lldb/include/lldb/Interpreter/OptionValue.h
+++ b/lldb/include/lldb/Interpreter/OptionValue.h
@@ -322,6 +322,51 @@ public:
       m_callback();
   }
 
+  template <typename T, std::enable_if_t<!std::is_pointer_v<T>, bool> = true>
+  std::optional<T> GetValueAs() const {
+    if constexpr (std::is_same_v<T, uint64_t>)
+      return GetUInt64Value();
+    if constexpr (std::is_same_v<T, int64_t>)
+      return GetSInt64Value();
+    if constexpr (std::is_same_v<T, bool>)
+      return GetBooleanValue();
+    if constexpr (std::is_same_v<T, char>)
+      return GetCharValue();
+    if constexpr (std::is_same_v<T, lldb::Format>)
+      return GetFormatValue();
+    if constexpr (std::is_same_v<T, lldb::LanguageType>)
+      return GetLanguageValue();
+    if constexpr (std::is_same_v<T, llvm::StringRef>)
+      return GetStringValue();
+    if constexpr (std::is_enum_v<T>)
+      if (std::optional<int64_t> value = GetEnumerationValue())
+        return static_cast<T>(*value);
+    return {};
+  }
+
+  template <typename T,
+            typename U = typename std::remove_const<
+                typename std::remove_pointer<T>::type>::type,
+            std::enable_if_t<std::is_pointer_v<T>, bool> = true>
+  T GetValueAs() const {
+    if constexpr (std::is_same_v<U, FormatEntity::Entry>)
+      return GetFormatEntity();
+    if constexpr (std::is_same_v<U, RegularExpression>)
+      return GetRegexValue();
+    return {};
+  }
+
+  bool SetValueAs(bool v) { return SetBooleanValue(v); }
+
+  bool SetValueAs(llvm::StringRef v) { return SetStringValue(v); }
+
+  bool SetValueAs(lldb::LanguageType v) { return SetLanguageValue(v); }
+
+  template <typename T, std::enable_if_t<std::is_enum_v<T>, bool> = true>
+  bool SetValueAs(T t) {
+    return SetEnumerationValue(t);
+  }
+
 protected:
   using TopmostBase = OptionValue;
 
diff --git a/lldb/include/lldb/Interpreter/OptionValueProperties.h b/lldb/include/lldb/Interpreter/OptionValueProperties.h
index 4782d7eff947..3251a5ed5e2e 100644
--- a/lldb/include/lldb/Interpreter/OptionValueProperties.h
+++ b/lldb/include/lldb/Interpreter/OptionValueProperties.h
@@ -122,57 +122,15 @@ public:
   bool SetPropertyAtIndexFromArgs(uint32_t idx, const Args &args,
                                   const ExecutionContext *exe_ctx = nullptr);
 
-  std::optional<bool>
-  GetPropertyAtIndexAsBoolean(uint32_t idx,
-                              const ExecutionContext *exe_ctx = nullptr) const;
-
-  bool SetPropertyAtIndexAsBoolean(uint32_t idx, bool new_value,
-                                   const ExecutionContext *exe_ctx = nullptr);
-
   OptionValueDictionary *GetPropertyAtIndexAsOptionValueDictionary(
       uint32_t idx, const ExecutionContext *exe_ctx = nullptr) const;
 
-  std::optional<int64_t> GetPropertyAtIndexAsEnumeration(
-      uint32_t idx, const ExecutionContext *exe_ctx = nullptr) const;
-
-  bool
-  SetPropertyAtIndexAsEnumeration(uint32_t idx, int64_t new_value,
-                                  const ExecutionContext *exe_ctx = nullptr);
-
-  const FormatEntity::Entry *
-  GetPropertyAtIndexAsFormatEntity(uint32_t idx,
-                                   const ExecutionContext *exe_ctx = nullptr);
-
-  const RegularExpression *GetPropertyAtIndexAsOptionValueRegex(
-      uint32_t idx, const ExecutionContext *exe_ctx = nullptr) const;
-
   OptionValueSInt64 *GetPropertyAtIndexAsOptionValueSInt64(
       uint32_t idx, const ExecutionContext *exe_ctx = nullptr) const;
 
   OptionValueUInt64 *GetPropertyAtIndexAsOptionValueUInt64(
       uint32_t idx, const ExecutionContext *exe_ctx = nullptr) const;
 
-  std::optional<int64_t>
-  GetPropertyAtIndexAsSInt64(uint32_t idx,
-                             const ExecutionContext *exe_ctx = nullptr) const;
-
-  bool SetPropertyAtIndexAsSInt64(uint32_t idx, int64_t new_value,
-                                  const ExecutionContext *exe_ctx = nullptr);
-
-  std::optional<uint64_t>
-  GetPropertyAtIndexAsUInt64(uint32_t idx,
-                             const ExecutionContext *exe_ctx = nullptr) const;
-
-  bool SetPropertyAtIndexAsUInt64(uint32_t idx, uint64_t new_value,
-                                  const ExecutionContext *exe_ctx = nullptr);
-
-  std::optional<llvm::StringRef>
-  GetPropertyAtIndexAsString(uint32_t idx,
-                             const ExecutionContext *exe_ctx = nullptr) const;
-
-  bool SetPropertyAtIndexAsString(uint32_t idx, llvm::StringRef new_value,
-                                  const ExecutionContext *exe_ctx = nullptr);
-
   OptionValueString *GetPropertyAtIndexAsOptionValueString(
       uint32_t idx, const ExecutionContext *exe_ctx = nullptr) const;
 
@@ -201,6 +159,31 @@ public:
   void SetValueChangedCallback(uint32_t property_idx,
                                std::function<void()> callback);
 
+  template <typename T>
+  auto GetPropertyAtIndexAs(uint32_t idx,
+                            const ExecutionContext *exe_ctx = nullptr) const {
+    if (const Property *property = GetPropertyAtIndex(idx, exe_ctx)) {
+      if (OptionValue *value = property->GetValue().get())
+        return value->GetValueAs<T>();
+    }
+    if constexpr (std::is_pointer_v<T>)
+      return T{nullptr};
+    else
+      return std::optional<T>{std::nullopt};
+  }
+
+  template <typename T>
+  bool SetPropertyAtIndex(uint32_t idx, T t,
+                          const ExecutionContext *exe_ctx = nullptr) const {
+    if (const Property *property = GetPropertyAtIndex(idx, exe_ctx)) {
+      if (OptionValue *value = property->GetValue().get()) {
+        value->SetValueAs(t);
+        return true;
+      }
+    }
+    return false;
+  }
+
 protected:
   Property *ProtectedGetPropertyAtIndex(uint32_t idx) {
     assert(idx < m_properties.size() && "invalid property index");