[IR]重构常量定义，引入undefvalue定义，修改常量方法使用尽量适配旧版

src/include/IR.h

@@ -268,6 +268,51 @@ class ValueCounter {
   }  ///< 清空ValueCounter
 };
 
+
+// --- Refactored ConstantValue and related classes start here ---
+
+using ConstantValVariant = std::variant<intmax_t, float>;
+
+// Helper for hashing std::variant
+struct VariantHash {
+  template <class T>
+  std::size_t operator()(const T& val) const {
+    return std::hash<T>{}(val);
+  }
+  std::size_t operator()(const ConstantValVariant& v) const {
+    return std::visit(*this, v);
+  }
+};
+
+struct ConstantValueKey {
+  Type* type;
+  ConstantValVariant val;
+
+  bool operator==(const ConstantValueKey& other) const {
+    // Assuming Type objects are canonicalized, or add Type::isSame()
+    // If Type::isSame() is not available and Type objects are not canonicalized,
+    // this comparison might not be robust enough for structural equivalence of types.
+    return type == other.type && val == other.val;
+  }
+};
+
+struct ConstantValueHash {
+  std::size_t operator()(const ConstantValueKey& key) const {
+    std::size_t typeHash = std::hash<Type*>{}(key.type);
+    std::size_t valHash = VariantHash{}(key.val);
+    // A simple way to combine hashes
+    return typeHash ^ (valHash << 1);
+  }
+};
+
+struct ConstantValueEqual {
+  bool operator()(const ConstantValueKey& lhs, const ConstantValueKey& rhs) const {
+    // Assuming Type objects are canonicalized (e.g., Type::getIntType() always returns same pointer)
+    // If not, and Type::isSame() is intended, it should be added to Type class.
+    return lhs.type == rhs.type && lhs.val == rhs.val;
+  }
+};
+
 /*!
  * Static constants known at compile time.
  *
@@ -275,46 +320,178 @@ class ValueCounter {
  * `Value`s. It's type is either `int` or `float`.
  * `ConstantValue`并不由指令定义, 也不使用任何Value。它的类型为int/float。
  */
-
-
 class ConstantValue : public Value {
- protected:
-  /// 定义字面量类型的聚合类型
-  union {
-    int iScalar;
-    float fScalar;
-  };
+protected:
+  static std::unordered_map<ConstantValueKey, ConstantValue*, ConstantValueHash, ConstantValueEqual> mConstantPool;
 
- protected:
-  explicit ConstantValue(int value, const std::string &name = "") : Value(Type::getIntType(), name), iScalar(value) {}
-  explicit ConstantValue(float value, const std::string &name = "")
-      : Value(Type::getFloatType(), name), fScalar(value) {}
+public:
+  explicit ConstantValue(Type* type, const std::string& name = "") : Value(type, name) {}
+  virtual ~ConstantValue() = default;
 
- public:
-  static ConstantValue* get(int value);    ///< 获取一个int类型的ConstValue *，其值为value
-  static ConstantValue* get(float value);  ///< 获取一个float类型的ConstValue *，其值为value
+  virtual size_t hash() const = 0;
+  virtual ConstantValVariant getValue() const = 0;
 
- public:
+  // Static factory method to get a canonical ConstantValue from the pool
+  static ConstantValue* get(Type* type, ConstantValVariant val);
+
+  // Helper methods to access constant values with appropriate casting
   int getInt() const {
-    assert(isInt());
-    return iScalar;
-  }  ///< 返回int类型的值
+    assert(getType()->isInt() && "Calling getInt() on non-integer type");
+    return std::get<int>(getValue());
+  }
   float getFloat() const {
-    assert(isFloat());
-    return fScalar;
-  }  ///< 返回float类型的值
-  template <typename T>
+    assert(getType()->isFloat() && "Calling getFloat() on non-float type");
+    return std::get<float>(getValue());
+  }
+
+  template<typename T>
   T getValue() const {
-    if (std::is_same<T, int>::value && isInt()) {
-      return getInt();
-    }
-    if (std::is_same<T, float>::value && isFloat()) {
-      return getFloat();
-    }
-    throw std::bad_cast();  // 或者其他适当的异常处理
-  }                         ///< 返回值，getInt和getFloat统一化，整数返回整形，浮点返回浮点型
+      if constexpr (std::is_same_v<T, int>) {
+          return getInt();
+      } else if constexpr (std::is_same_v<T, float>) {
+          return getFloat();
+      } else {
+          // This ensures a compilation error if an unsupported type is used
+          static_assert(std::always_false_v<T>, "Unsupported type for ConstantValue::getValue()");
+      }
+  }
+
+  virtual bool isZero() const = 0;
+  virtual bool isOne() const = 0;
 };
 
+class ConstantInteger : public ConstantValue {
+  int constVal;
+public:
+  explicit ConstantInteger(Type* type, int val, const std::string& name = "")
+      : ConstantValue(type, name), constVal(val) {}
+
+  size_t hash() const override {
+      std::size_t typeHash = std::hash<Type*>{}(getType());
+      std::size_t valHash = std::hash<int>{}(constVal);
+      return typeHash ^ (valHash << 1);
+  }
+  int getInt() const { return constVal; }
+  ConstantValVariant getValue() const override { return constVal; }
+
+  static ConstantInteger* get(Type* type, int val);
+  static ConstantInteger* get(int val) { return get(Type::getIntType(), val); }
+
+  ConstantInteger* getNeg() const {
+    assert(getType()->isInt() && "Cannot negate non-integer constant");
+    return ConstantInteger::get(-constVal);
+  }
+
+  bool isZero() const override { return constVal == 0; }
+  bool isOne() const override { return constVal == 1; }
+};
+
+class ConstantFloating : public ConstantValue {
+  float constFVal;
+public:
+  explicit ConstantFloating(Type* type, float val, const std::string& name = "")
+      : ConstantValue(type, name), constFVal(val) {}
+
+  size_t hash() const override {
+    std::size_t typeHash = std::hash<Type*>{}(getType());
+    std::size_t valHash = std::hash<float>{}(constFVal);
+    return typeHash ^ (valHash << 1);
+  }
+  float getFloat() const { return constFVal; }
+  ConstantValVariant getValue() const override { return constFVal; }
+
+  static ConstantFloating* get(Type* type, float val);
+  static ConstantFloating* get(float val) { return get(Type::getFloatType(), val); }
+
+  ConstantFloating* getNeg() const {
+    assert(getType()->isFloat() && "Cannot negate non-float constant");
+    return ConstantFloating::get(-constFVal);
+  }
+
+  bool isZero() const override { return constFVal == 0.0f; }
+  bool isOne() const override { return constFVal == 1.0f; }
+};
+
+class UndefinedValue : public ConstantValue {
+private:
+  static std::unordered_map<Type*, UndefinedValue*> UndefValues;
+
+protected:
+  explicit UndefinedValue(Type* type, const std::string& name = "")
+      : ConstantValue(type, name) {
+    assert(!type->isVoid() && "Cannot create UndefinedValue of void type!");
+  }
+
+public:
+  static UndefinedValue* get(Type* type);
+
+  size_t hash() const override {
+    return std::hash<Type*>{}(getType());
+  }
+
+  ConstantValVariant getValue() const override {
+    if (getType()->isInt()) {
+      return 0; // Return 0 for undefined integer
+    } else if (getType()->isFloat()) {
+      return 0.0f; // Return 0.0f for undefined float
+    }
+    assert(false && "UndefinedValue has unexpected type for getValue()");
+    return 0; // Should not be reached
+  }
+
+  bool isZero() const override { return false; }
+  bool isOne() const override { return false; }
+};
+
+// Implementations for static members (typically in .cpp, but for single-file, put here)
+
+std::unordered_map<ConstantValueKey, ConstantValue*, ConstantValueHash, ConstantValueEqual> ConstantValue::mConstantPool;
+std::unordered_map<Type*, UndefinedValue*> UndefinedValue::UndefValues;
+
+ConstantValue* ConstantValue::get(Type* type, ConstantValVariant val) {
+  ConstantValueKey key = {type, val};
+  auto it = mConstantPool.find(key);
+  if (it != mConstantPool.end()) {
+    return it->second;
+  }
+
+  ConstantValue* newConstant = nullptr;
+  if (std::holds_alternative<int>(val)) {
+    newConstant = new ConstantInteger(type, std::get<int>(val));
+  } else if (std::holds_alternative<float>(val)) {
+    newConstant = new ConstantFloating(type, std::get<float>(val));
+  } else {
+    assert(false && "Unsupported ConstantValVariant type");
+  }
+
+  mConstantPool[key] = newConstant;
+  return newConstant;
+}
+
+ConstantInteger* ConstantInteger::get(Type* type, int val) {
+  return dynamic_cast<ConstantInteger*>(ConstantValue::get(type, val));
+}
+
+ConstantFloating* ConstantFloating::get(Type* type, float val) {
+  return dynamic_cast<ConstantFloating*>(ConstantValue::get(type, val));
+}
+
+UndefinedValue* UndefinedValue::get(Type* type) {
+  assert(!type->isVoid() && "Cannot get UndefinedValue of void type!");
+
+  auto it = UndefValues.find(type);
+  if (it != UndefValues.end()) {
+    return it->second;
+  }
+
+  UndefinedValue* newUndef = new UndefinedValue(type);
+  UndefValues[type] = newUndef;
+  return newUndef;
+}
+
+// --- End of refactored ConstantValue and related classes ---
+
+
 class Instruction;
 class Function;
 class BasicBlock;
@@ -562,8 +739,8 @@ class Instruction : public User {
     kLa = 0x1UL << 36,
     kMemset = 0x1UL << 37,
     kGetSubArray = 0x1UL << 38,
-    // constant
-    kConstant = 0x1UL << 37, 
+    // Constant Kind removed as Constants are now Values, not Instructions.
+    // kConstant = 0x1UL << 37, // Conflicts with kMemset if kept as is
     // phi
     kPhi = 0x1UL << 39,
     kBitItoF = 0x1UL << 40,
@@ -1258,12 +1435,15 @@ protected:
     if (init.size() == 0) {
       unsigned num = 1;
       for (unsigned i = 0; i < numDims; i++) {
-        num *= dynamic_cast<ConstantValue *>(dims[i])->getInt();
+        // Assume dims elements are ConstantInteger and cast appropriately
+        auto dim_val = dynamic_cast<ConstantInteger*>(dims[i]);
+        assert(dim_val && "GlobalValue dims must be constant integers");
+        num *= dim_val->getInt();
       }
       if (dynamic_cast<PointerType *>(type)->getBaseType() == Type::getFloatType()) {
-        init.push_back(ConstantValue::get(0.0F), num);
+        init.push_back(ConstantFloating::get(0.0F), num); // Use new constant factory
       } else {
-        init.push_back(ConstantValue::get(0), num);
+        init.push_back(ConstantInteger::get(0), num); // Use new constant factory
       }
     }
     initValues = init;
@@ -1289,8 +1469,11 @@ public:
    Value* getByIndices(const std::vector<Value *> &indices) const  {
     int index = 0;
     for (size_t i = 0; i < indices.size(); i++) {
-      index = dynamic_cast<ConstantValue *>(getDim(i))->getInt() * index +
-              dynamic_cast<ConstantValue *>(indices[i])->getInt();
+      // Ensure dims[i] and indices[i] are ConstantInteger and retrieve their values correctly
+      auto dim_val = dynamic_cast<ConstantInteger*>(getDim(i));
+      auto idx_val = dynamic_cast<ConstantInteger*>(indices[i]);
+      assert(dim_val && idx_val && "Dims and indices must be constant integers");
+      index = dim_val->getInt() * index + idx_val->getInt();
     }
     return getByIndex(index);
   }  ///< 通过多维索引indices获取初始值
@@ -1331,8 +1514,11 @@ class ConstantVariable : public User, public LVal {
     int index = 0;
     // 计算偏移量
     for (size_t i = 0; i < indices.size(); i++) {
-      index = dynamic_cast<ConstantValue *>(getDim(i))->getInt() * index +
-              dynamic_cast<ConstantValue *>(indices[i])->getInt();
+      // Ensure dims[i] and indices[i] are ConstantInteger and retrieve their values correctly
+      auto dim_val = dynamic_cast<ConstantInteger*>(getDim(i));
+      auto idx_val = dynamic_cast<ConstantInteger*>(indices[i]);
+      assert(dim_val && idx_val && "Dims and indices must be constant integers");
+      index = dim_val->getInt() * index + idx_val->getInt();
     }
 
     return getByIndex(index);