Port irregexp bytecode compiler and interpreter from V8 r24065.

runtime/vm/regexp_assembler_bytecode_inl.h

+// Copyright (c) 2015, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+// A light-weight assembler for the Irregexp byte code.
+
+#include "vm/regexp_bytecodes.h"
+
+#ifndef VM_REGEXP_ASSEMBLER_BYTECODE_INL_H_
+#define VM_REGEXP_ASSEMBLER_BYTECODE_INL_H_
+
+namespace dart {
+
+void BytecodeRegExpMacroAssembler::Emit(uint32_t byte,
+                                        uint32_t twenty_four_bits) {
+  uint32_t word = ((twenty_four_bits << BYTECODE_SHIFT) | byte);
+  ASSERT(pc_ <= buffer_->length());
+  if (pc_  + 3 >= buffer_->length()) {
+    Expand();
+  }
+  *reinterpret_cast<uint32_t*>(buffer_->data() + pc_) = word;
+  pc_ += 4;
+}
+
+
+void BytecodeRegExpMacroAssembler::Emit16(uint32_t word) {
+  ASSERT(pc_ <= buffer_->length());
+  if (pc_ + 1 >= buffer_->length()) {
+    Expand();
+  }
+  *reinterpret_cast<uint16_t*>(buffer_->data() + pc_) = word;
+  pc_ += 2;
+}
+
+
+void BytecodeRegExpMacroAssembler::Emit8(uint32_t word) {
+  ASSERT(pc_ <= buffer_->length());
+  if (pc_ == buffer_->length()) {
+    Expand();
+  }
+  *reinterpret_cast<unsigned char*>(buffer_->data() + pc_) = word;
+  pc_ += 1;
+}
+
+
+void BytecodeRegExpMacroAssembler::Emit32(uint32_t word) {
+  ASSERT(pc_ <= buffer_->length());
+  if (pc_ + 3 >= buffer_->length()) {
+    Expand();
+  }
+  *reinterpret_cast<uint32_t*>(buffer_->data() + pc_) = word;
+  pc_ += 4;
+}
+
+}  // namespace dart
+
+#endif  // VM_REGEXP_ASSEMBLER_BYTECODE_INL_H_