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+/*
+ * Copyright (C) 2015 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+#ifndef ART_RUNTIME_LAMBDA_ART_LAMBDA_METHOD_H_
+#define ART_RUNTIME_LAMBDA_ART_LAMBDA_METHOD_H_
+
+#include "base/macros.h"
+#include "art_method.h"
+
+#include <stdint.h>
+
+namespace art {
+namespace lambda {
+
+class ArtLambdaMethod {
+ public:
+  // Construct an art lambda method.
+  // The target method is the one invoked by invoke-lambda.
+  // The type descriptor describes the types of variables captured, e.g. "ZFLObject;\FI;[Z"
+  // The shorty drops the object name and treats arrays as objects, e.g. "ZFL\L"
+  // Innate lambda means that the lambda was originally created via invoke-lambda.
+  // -- Non-innate lambdas (learned lambdas) come from a regular class that was boxed to lambda.
+  // (Ownership of strings is retained by the caller and the lifetime should exceed this class).
+  ArtLambdaMethod(ArtMethod* target_method,
+                  const char* captured_variables_type_descriptor,
+                  const char* captured_variables_shorty_,
+                  bool innate_lambda = true);
+
+  // Get the target method for this lambda that would be used by the invoke-lambda dex instruction.
+  ArtMethod* GetArtMethod() const {
+    return method_;
+  }
+
+  // Get the compile-time size of lambda closures for this method in bytes.
+  // This is circular (that is, it includes the size of the ArtLambdaMethod pointer).
+  // One should also check if the size is dynamic since nested lambdas have a runtime size.
+  size_t GetStaticClosureSize() const {
+    return closure_size_;
+  }
+
+  // Get the type descriptor for the list of captured variables.
+  // e.g. "ZFLObject;\FI;[Z" means a captured int, float, class Object, lambda FI, array of ints
+  const char* GetCapturedVariablesTypeDescriptor() const {
+    return captured_variables_type_descriptor_;
+  }
+
+  // Get the shorty 'field' type descriptor list of captured variables.
+  // This follows the same rules as a string of ShortyFieldType in the dex specification.
+  // Every captured variable is represented by exactly one character.
+  // - Objects become 'L'.
+  // - Arrays become 'L'.
+  // - Lambdas become '\'.
+  const char* GetCapturedVariablesShortyTypeDescriptor() const {
+    return captured_variables_shorty_;
+  }
+
+  // Will the size of this lambda change at runtime?
+  // Only returns true if there is a nested lambda that we can't determine statically the size of.
+  bool IsDynamicSize() const {
+    return dynamic_size_;
+  }
+
+  // Will the size of this lambda always be constant at runtime?
+  // This generally means there's no nested lambdas, or we were able to successfully determine
+  // their size statically at compile time.
+  bool IsStaticSize() const {
+    return !IsDynamicSize();
+  }
+  // Is this a lambda that was originally created via invoke-lambda?
+  // -- Non-innate lambdas (learned lambdas) come from a regular class that was boxed to lambda.
+  bool IsInnateLambda() const {
+    return innate_lambda_;
+  }
+
+  // How many variables were captured?
+  // (Each nested lambda counts as 1 captured var regardless of how many captures it itself has).
+  size_t GetNumberOfCapturedVariables() const {
+    return strlen(captured_variables_shorty_);
+  }
+
+ private:
+  // TODO: ArtMethod, or at least the entry points should be inlined into this struct
+  // to avoid an extra indirect load when doing invokes.
+  // Target method that invoke-lambda will jump to.
+  ArtMethod* method_;
+  // How big the closure is (in bytes). Only includes the constant size.
+  size_t closure_size_;
+  // The type descriptor for the captured variables, e.g. "IS" for [int, short]
+  const char* captured_variables_type_descriptor_;
+  // The shorty type descriptor for captured vars, (e.g. using 'L' instead of 'LObject;')
+  const char* captured_variables_shorty_;
+  // Whether or not the size is dynamic. If it is, copiers need to read the Closure size at runtime.
+  bool dynamic_size_;
+  // True if this lambda was originally made with create-lambda,
+  // false if it came from a class instance (through new-instance and then unbox-lambda).
+  bool innate_lambda_;
+
+  DISALLOW_COPY_AND_ASSIGN(ArtLambdaMethod);
+};
+
+}  // namespace lambda
+}  // namespace art
+
+#endif  // ART_RUNTIME_LAMBDA_ART_LAMBDA_METHOD_H_