First part of new ICData infrastructure: use a wrapper object instead of an array.

runtime/vm/ic_data.cc

Index: runtime/vm/ic_data.cc
===================================================================
--- runtime/vm/ic_data.cc	(revision 4401)
+++ runtime/vm/ic_data.cc	(working copy)
@@ -1,130 +0,0 @@
-// 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/ic_data.h"
-#include "vm/object.h"
-
-namespace dart {
-
-// ICData is a ValueObject, therefore 'data' need not be a ZoneObject.
-ICData::ICData(const Array& data) : data_(&data) {
-  // Check consistency.
-  ASSERT(data_->IsNull() || !String::Handle(FunctionName()).IsNull());
-  ASSERT(data_->IsNull() || (NumberOfArgumentsChecked() > 0));
-}
-
-
-ICData::ICData(const String& function_name, intptr_t num_args_checked)
-    : data_(NULL) {
-  // Array contains: function-name, num_checked, NULL check sentinel (classes,
-  // target).
-  const intptr_t len = kChecksStartIndex + (num_args_checked + 1);
-  data_ = &Array::ZoneHandle(Array::New(len, Heap::kOld));
-  data_->SetAt(kNameIndex, function_name);
-  data_->SetAt(kNumArgsCheckedIndex, Smi::Handle(Smi::New(num_args_checked)));
-}
-
-
-RawArray* ICData::data() const {
-  return data_->raw();
-}
-
-
-void ICData::set_data(const Array& value) {
-  data_ = &value;
-  // Check consistency.
-  ASSERT(data_->IsNull() || !String::Handle(FunctionName()).IsNull());
-  ASSERT(data_->IsNull() || (NumberOfArgumentsChecked() > 0));
-}
-
-
-intptr_t ICData::ArrayElementsPerCheck() const {
-  // Number of checked classes + target.
-  return NumberOfArgumentsChecked() + 1;
-}
-
-
-intptr_t ICData::NumberOfArgumentsChecked() const {
-  if (data_->IsNull()) return 0;
-  Smi& result = Smi::Handle();
-  result ^= data_->At(kNumArgsCheckedIndex);
-  return result.Value();
-}
-
-
-intptr_t ICData::NumberOfChecks() const {
-  if (data_->IsNull()) return 0;
-  const intptr_t per_check = ArrayElementsPerCheck();
-  // Subtract function-name, num-checked and sentinel
-  intptr_t len = data_->Length() - kChecksStartIndex - per_check;
-  ASSERT(len % per_check == 0);
-  return len / per_check;
-}
-
-
-RawString* ICData::FunctionName() const {
-  if (data_->IsNull()) return String::null();
-  String& result = String::Handle();
-  result ^= data_->At(kNameIndex);
-  return result.raw();
-}
-
-
-void ICData::AddCheck(const GrowableArray<const Class*>& classes,
-                      const Function& target) {
-  ASSERT(!data_->IsNull());
-  intptr_t old_number_of_checks = NumberOfChecks();
-  intptr_t new_len = data_->Length() + ArrayElementsPerCheck();
-  data_ = &Array::ZoneHandle(Array::Grow(*data_, new_len, Heap::kOld));
-  SetCheckAt(old_number_of_checks, classes, target);
-}
-
-
-void ICData::SetCheckAt(intptr_t index,
-                        const GrowableArray<const Class*>& classes,
-                        const Function& target) {
-  ASSERT(!data_->IsNull());
-  ASSERT((0 <= index) && (index < NumberOfChecks()));
-  intptr_t pos = kChecksStartIndex + ArrayElementsPerCheck() * index;
-  ASSERT(classes.length() == NumberOfArgumentsChecked());
-  for (intptr_t i = 0; i < classes.length(); i++) {
-    // Null is used as terminating object, do not add it.
-    ASSERT(!classes[i]->IsNull());
-    data_->SetAt(pos++, *(classes[i]));
-  }
-  ASSERT(!target.IsNull());
-  data_->SetAt(pos, target);
-}
-
-
-void ICData::GetOneClassCheckAt(intptr_t index,
-                                Class* cls,
-                                Function* target) const {
-  ASSERT(cls != NULL);
-  ASSERT(target != NULL);
-  ASSERT((0 <= index) && (index < NumberOfChecks()));
-  ASSERT(NumberOfArgumentsChecked() == 1);
-  intptr_t pos = 1 + 1 + ArrayElementsPerCheck() * index;
-  *cls ^= data_->At(pos);
-  (*target) ^= data_->At(pos + 1);
-}
-
-
-void ICData::GetCheckAt(intptr_t index,
-                        GrowableArray<const Class*>* classes,
-                        Function* target) const {
-  ASSERT(classes != NULL);
-  ASSERT(target != NULL);
-  ASSERT((0 <= index) && (index < NumberOfChecks()));
-  classes->Clear();
-  intptr_t pos = 1 + 1 + ArrayElementsPerCheck() * index;
-  for (intptr_t i = 0; i < NumberOfArgumentsChecked(); i++) {
-    Class& cls = Class::ZoneHandle();
-    cls ^= data_->At(pos++);
-    classes->Add(&cls);
-  }
-  (*target) ^= data_->At(pos);
-}
-
-}  // namespace dart