--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/hotspot/share/classfile/bytecodeAssembler.cpp	Tue Sep 12 19:03:39 2017 +0200
@@ -0,0 +1,257 @@
+/*
+ * Copyright (c) 2012, 2017, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ *
+ */
+
+#include "precompiled.hpp"
+
+#include "classfile/bytecodeAssembler.hpp"
+#include "interpreter/bytecodes.hpp"
+#include "memory/oopFactory.hpp"
+#include "oops/constantPool.hpp"
+#include "utilities/bytes.hpp"
+
+u2 BytecodeConstantPool::find_or_add(BytecodeCPEntry const& bcpe) {
+  u2 index;
+  u2* probe = _indices.get(bcpe);
+  if (probe == NULL) {
+    index = _entries.length();
+    _entries.append(bcpe);
+    _indices.put(bcpe, index);
+  } else {
+    index = *probe;
+  }
+  return index + _orig->length();
+}
+
+ConstantPool* BytecodeConstantPool::create_constant_pool(TRAPS) const {
+  if (_entries.length() == 0) {
+    return _orig;
+  }
+
+  ConstantPool* cp = ConstantPool::allocate(
+      _orig->pool_holder()->class_loader_data(),
+      _orig->length() + _entries.length(), CHECK_NULL);
+
+  cp->set_pool_holder(_orig->pool_holder());
+  _orig->copy_cp_to(1, _orig->length() - 1, cp, 1, CHECK_NULL);
+
+  for (int i = 0; i < _entries.length(); ++i) {
+    BytecodeCPEntry entry = _entries.at(i);
+    int idx = i + _orig->length();
+    switch (entry._tag) {
+      case BytecodeCPEntry::UTF8:
+        entry._u.utf8->increment_refcount();
+        cp->symbol_at_put(idx, entry._u.utf8);
+        break;
+      case BytecodeCPEntry::KLASS:
+        cp->klass_index_at_put(
+            idx, entry._u.klass);
+        break;
+      case BytecodeCPEntry::STRING:
+        cp->unresolved_string_at_put(
+            idx, cp->symbol_at(entry._u.string));
+        break;
+      case BytecodeCPEntry::NAME_AND_TYPE:
+        cp->name_and_type_at_put(idx,
+            entry._u.name_and_type.name_index,
+            entry._u.name_and_type.type_index);
+        break;
+      case BytecodeCPEntry::METHODREF:
+        cp->method_at_put(idx,
+            entry._u.methodref.class_index,
+            entry._u.methodref.name_and_type_index);
+        break;
+      default:
+        ShouldNotReachHere();
+    }
+  }
+
+  cp->initialize_unresolved_klasses(_orig->pool_holder()->class_loader_data(),
+                                    CHECK_NULL);
+  return cp;
+}
+
+void BytecodeAssembler::append(u1 imm_u1) {
+  _code->append(imm_u1);
+}
+
+void BytecodeAssembler::append(u2 imm_u2) {
+  _code->append(0);
+  _code->append(0);
+  Bytes::put_Java_u2(_code->adr_at(_code->length() - 2), imm_u2);
+}
+
+void BytecodeAssembler::append(u4 imm_u4) {
+  _code->append(0);
+  _code->append(0);
+  _code->append(0);
+  _code->append(0);
+  Bytes::put_Java_u4(_code->adr_at(_code->length() - 4), imm_u4);
+}
+
+void BytecodeAssembler::xload(u4 index, u1 onebyteop, u1 twobyteop) {
+  if (index < 4) {
+    _code->append(onebyteop + index);
+  } else {
+    _code->append(twobyteop);
+    _code->append((u2)index);
+  }
+}
+
+void BytecodeAssembler::dup() {
+  _code->append(Bytecodes::_dup);
+}
+
+void BytecodeAssembler::_new(Symbol* sym) {
+  u2 cpool_index = _cp->klass(sym);
+  _code->append(Bytecodes::_new);
+  append(cpool_index);
+}
+
+void BytecodeAssembler::load_string(Symbol* sym) {
+  u2 cpool_index = _cp->string(sym);
+  if (cpool_index < 0x100) {
+    ldc(cpool_index);
+  } else {
+    ldc_w(cpool_index);
+  }
+}
+
+void BytecodeAssembler::ldc(u1 index) {
+  _code->append(Bytecodes::_ldc);
+  append(index);
+}
+
+void BytecodeAssembler::ldc_w(u2 index) {
+  _code->append(Bytecodes::_ldc_w);
+  append(index);
+}
+
+void BytecodeAssembler::athrow() {
+  _code->append(Bytecodes::_athrow);
+}
+
+void BytecodeAssembler::iload(u4 index) {
+  xload(index, Bytecodes::_iload_0, Bytecodes::_iload);
+}
+
+void BytecodeAssembler::lload(u4 index) {
+  xload(index, Bytecodes::_lload_0, Bytecodes::_lload);
+}
+
+void BytecodeAssembler::fload(u4 index) {
+  xload(index, Bytecodes::_fload_0, Bytecodes::_fload);
+}
+
+void BytecodeAssembler::dload(u4 index) {
+  xload(index, Bytecodes::_dload_0, Bytecodes::_dload);
+}
+
+void BytecodeAssembler::aload(u4 index) {
+  xload(index, Bytecodes::_aload_0, Bytecodes::_aload);
+}
+
+void BytecodeAssembler::load(BasicType bt, u4 index) {
+  switch (bt) {
+    case T_BOOLEAN:
+    case T_CHAR:
+    case T_BYTE:
+    case T_SHORT:
+    case T_INT:     iload(index); break;
+    case T_FLOAT:   fload(index); break;
+    case T_DOUBLE:  dload(index); break;
+    case T_LONG:    lload(index); break;
+    case T_OBJECT:
+    case T_ARRAY:   aload(index); break;
+    default:
+      ShouldNotReachHere();
+  }
+}
+
+void BytecodeAssembler::checkcast(Symbol* sym) {
+  u2 cpool_index = _cp->klass(sym);
+  _code->append(Bytecodes::_checkcast);
+  append(cpool_index);
+}
+
+void BytecodeAssembler::invokespecial(Method* method) {
+  invokespecial(method->klass_name(), method->name(), method->signature());
+}
+
+void BytecodeAssembler::invokespecial(Symbol* klss, Symbol* name, Symbol* sig) {
+  u2 methodref_index = _cp->methodref(klss, name, sig);
+  _code->append(Bytecodes::_invokespecial);
+  append(methodref_index);
+}
+
+void BytecodeAssembler::invokevirtual(Method* method) {
+  invokevirtual(method->klass_name(), method->name(), method->signature());
+}
+
+void BytecodeAssembler::invokevirtual(Symbol* klss, Symbol* name, Symbol* sig) {
+  u2 methodref_index = _cp->methodref(klss, name, sig);
+  _code->append(Bytecodes::_invokevirtual);
+  append(methodref_index);
+}
+
+void BytecodeAssembler::ireturn() {
+  _code->append(Bytecodes::_ireturn);
+}
+
+void BytecodeAssembler::lreturn() {
+  _code->append(Bytecodes::_lreturn);
+}
+
+void BytecodeAssembler::freturn() {
+  _code->append(Bytecodes::_freturn);
+}
+
+void BytecodeAssembler::dreturn() {
+  _code->append(Bytecodes::_dreturn);
+}
+
+void BytecodeAssembler::areturn() {
+  _code->append(Bytecodes::_areturn);
+}
+
+void BytecodeAssembler::_return() {
+  _code->append(Bytecodes::_return);
+}
+
+void BytecodeAssembler::_return(BasicType bt) {
+  switch (bt) {
+    case T_BOOLEAN:
+    case T_CHAR:
+    case T_BYTE:
+    case T_SHORT:
+    case T_INT:     ireturn(); break;
+    case T_FLOAT:   freturn(); break;
+    case T_DOUBLE:  dreturn(); break;
+    case T_LONG:    lreturn(); break;
+    case T_OBJECT:
+    case T_ARRAY:   areturn(); break;
+    case T_VOID:    _return(); break;
+    default:
+      ShouldNotReachHere();
+  }
+}