Start moving stack-related stuff out of thread.h.

This was in preparation for implementing "SmartFrame", which is back on hold
while I finish finalization.

Change-Id: I006c9cfbc34520b9b0a72972611036d908a1d84b
diff --git a/src/stack_indirect_reference_table.h b/src/stack_indirect_reference_table.h
new file mode 100644
index 0000000..f0b6698
--- /dev/null
+++ b/src/stack_indirect_reference_table.h
@@ -0,0 +1,68 @@
+/*
+ * Copyright (C) 2011 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef ART_SRC_STACK_INDIRECT_REFERENCE_TABLE_H_
+#define ART_SRC_STACK_INDIRECT_REFERENCE_TABLE_H_
+
+namespace art {
+
+#include "macros.h"
+
+class Object;
+
+// Stack allocated indirect reference table, allocated within the bridge frame
+// between managed and native code.
+class StackIndirectReferenceTable {
+public:
+  // Number of references contained within this SIRT
+  size_t NumberOfReferences() {
+    return number_of_references_;
+  }
+
+  // Link to previous SIRT or NULL
+  StackIndirectReferenceTable* Link() {
+    return link_;
+  }
+
+  Object** References() {
+    return references_;
+  }
+
+  // Offset of length within SIRT, used by generated code
+  static size_t NumberOfReferencesOffset() {
+    return OFFSETOF_MEMBER(StackIndirectReferenceTable, number_of_references_);
+  }
+
+  // Offset of link within SIRT, used by generated code
+  static size_t LinkOffset() {
+    return OFFSETOF_MEMBER(StackIndirectReferenceTable, link_);
+  }
+
+private:
+  StackIndirectReferenceTable() {}
+
+  size_t number_of_references_;
+  StackIndirectReferenceTable* link_;
+
+  // Fake array, really allocated and filled in by jni_compiler.
+  Object* references_[0];
+
+  DISALLOW_COPY_AND_ASSIGN(StackIndirectReferenceTable);
+};
+
+}  // namespace art
+
+#endif  // ART_SRC_STACK_INDIRECT_REFERENCE_TABLE_H_