Port jump and call instruction decoding and patching for x64.

runtime/vm/instructions_x64.cc

+// Copyright (c) 2011, 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.
+
+#include "vm/globals.h"  // Needed here to get TARGET_ARCH_X64.
+#if defined(TARGET_ARCH_X64)
+
+#include "vm/instructions.h"
+#include "vm/object.h"
+
+namespace dart {
+
+bool Instruction::TestBytesWith(const int* data, int num_bytes) const {
+  ASSERT(data != NULL);
+  const uint8_t* byte_array = reinterpret_cast<const uint8_t*>(start_);
+  for (int i = 0; i < num_bytes; i++) {
+    // Skip comparison for data[i] < 0.
+    if ((data[i] >= 0) && (byte_array[i] != (0xFF & data[i]))) {
+      return false;
+    }
+  }
+  return true;
+}
+
+
+uword CallOrJump::TargetAddress() const {
+  ASSERT(IsValid());
+  return *reinterpret_cast<uword*>(start() + 2);
+}
+
+
+void CallOrJump::SetTargetAddress(uword target) const {
+  ASSERT(IsValid());
+  *reinterpret_cast<uword*>(start() + 2) = target;
+}
+
+
+const int* Call::pattern() const {
+  // movq $target, TMP
+  // callq *TMP
+  static const int kCallPattern[kLengthInBytes] =
+      {0x49, 0xBB, -1, -1, -1, -1, -1, -1, -1, -1, 0x41, 0xFF, 0xE3};
+  return kCallPattern;
+}
+
+
+const int* Jump::pattern() const {
+  // movq $target, TMP
+  // jmpq TMP
+  static const int kJumpPattern[kLengthInBytes] =
+      {0x49, 0xBB, -1, -1, -1, -1, -1, -1, -1, -1, 0x41, 0xFF, 0xE3};
+  return kJumpPattern;
+}
+
+
+}  // namespace dart
+
+#endif  // defined TARGET_ARCH_X64