Replace intptr_t with TokenDescriptor

runtime/vm/token_position.cc

+// Copyright (c) 2016, 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/token_position.h"
+
+#include "vm/object.h"
+
+namespace dart {
+
+
+TokenPosition TokenPosition::SnapshotDecode(int32_t value) {
+  return TokenPosition(static_cast<intptr_t>(value));
+}
+
+
+int32_t TokenPosition::SnapshotEncode() {
+  return static_cast<int32_t>(value_);
+}
+
+
+bool TokenPosition::IsSynthetic() const {
+  if (value_ >= kMinSourcePos) {
+    return false;
+  }
+  if (value_ < kLast.value()) {
+    return true;
+  }
+  return false;
+}
+
+
+#define DEFINE_VALUES(name, value)                                             \
+const TokenPosition TokenPosition::k##name = TokenPosition(value);
+  SENTINEL_TOKEN_DESCRIPTORS(DEFINE_VALUES);
+#undef DEFINE_VALUES
+const TokenPosition TokenPosition::kMinSource =
+    TokenPosition(kMinSourcePos);
+
+const TokenPosition TokenPosition::kMaxSource =
+    TokenPosition(kMaxSourcePos);
+
+
+const char* TokenPosition::ToCString() const {
+  switch (value_) {
+#define DEFINE_CASE(name, value)                                               \
+    case value: return #name;
+    SENTINEL_TOKEN_DESCRIPTORS(DEFINE_CASE);
+#undef DEFINE_CASE
+    default: {
+      Zone* zone = Thread::Current()->zone();
+      ASSERT(zone != NULL);
+      if (IsSynthetic()) {
+        // TODO(johnmccutchan): Print synthetic positions differently.
+        return FromSynthetic().ToCString();
+      } else {
+        return OS::SCreate(zone, "%d", value_);
+      }
+    }
+  }
+}
+
+}  // namespace dart