upload android base code part3

2018-08-08 16:48:17 +08:00 · 2018-08-08 16:48:17 +08:00 · b9e30e05b1
commit b9e30e05b1
parent 71b83c22f1
15122 changed files with 2089659 additions and 0 deletions
--- a/android/art/runtime/imtable-inl.h
+++ b/android/art/runtime/imtable-inl.h
@ -0,0 +1,104 @@
+/*
+ * Copyright (C) 2016 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_IMTABLE_INL_H_
+#define ART_RUNTIME_IMTABLE_INL_H_
+
+#include "imtable.h"
+
+#include "art_method-inl.h"
+#include "dex_file.h"
+#include "utf.h"
+
+namespace art {
+
+static constexpr bool kImTableHashUseName = true;
+static constexpr bool kImTableHashUseCoefficients = true;
+
+// Magic configuration that minimizes some common runtime calls.
+static constexpr uint32_t kImTableHashCoefficientClass = 427;
+static constexpr uint32_t kImTableHashCoefficientName = 16;
+static constexpr uint32_t kImTableHashCoefficientSignature = 14;
+
+inline void ImTable::GetImtHashComponents(ArtMethod* method,
+                                          uint32_t* class_hash,
+                                          uint32_t* name_hash,
+                                          uint32_t* signature_hash) {
+  if (kImTableHashUseName) {
+    if (method->IsProxyMethod()) {
+      *class_hash = 0;
+      *name_hash = 0;
+      *signature_hash = 0;
+      return;
+    }
+
+    const DexFile* dex_file = method->GetDexFile();
+    const DexFile::MethodId& method_id = dex_file->GetMethodId(method->GetDexMethodIndex());
+
+    // Class descriptor for the class component.
+    *class_hash = ComputeModifiedUtf8Hash(dex_file->GetMethodDeclaringClassDescriptor(method_id));
+
+    // Method name for the method component.
+    *name_hash = ComputeModifiedUtf8Hash(dex_file->GetMethodName(method_id));
+
+    const DexFile::ProtoId& proto_id = dex_file->GetMethodPrototype(method_id);
+
+    // Read the proto for the signature component.
+    uint32_t tmp = ComputeModifiedUtf8Hash(
+        dex_file->GetTypeDescriptor(dex_file->GetTypeId(proto_id.return_type_idx_)));
+
+    // Mix in the argument types.
+    // Note: we could consider just using the shorty. This would be faster, at the price of
+    //       potential collisions.
+    const DexFile::TypeList* param_types = dex_file->GetProtoParameters(proto_id);
+    if (param_types != nullptr) {
+      for (size_t i = 0; i != param_types->Size(); ++i) {
+        const DexFile::TypeItem& type = param_types->GetTypeItem(i);
+        tmp = 31 * tmp + ComputeModifiedUtf8Hash(
+            dex_file->GetTypeDescriptor(dex_file->GetTypeId(type.type_idx_)));
+      }
+    }
+
+    *signature_hash = tmp;
+    return;
+  } else {
+    *class_hash = method->GetDexMethodIndex();
+    *name_hash = 0;
+    *signature_hash = 0;
+    return;
+  }
+}
+
+inline uint32_t ImTable::GetImtIndex(ArtMethod* method) {
+  uint32_t class_hash, name_hash, signature_hash;
+  GetImtHashComponents(method, &class_hash, &name_hash, &signature_hash);
+
+  uint32_t mixed_hash;
+  if (!kImTableHashUseCoefficients) {
+    mixed_hash = class_hash + name_hash + signature_hash;
+  } else {
+    mixed_hash = kImTableHashCoefficientClass * class_hash +
+                 kImTableHashCoefficientName * name_hash +
+                 kImTableHashCoefficientSignature * signature_hash;
+  }
+
+  return mixed_hash % ImTable::kSize;
+}
+
+}  // namespace art
+
+#endif  // ART_RUNTIME_IMTABLE_INL_H_
+