Initial population of CoreRT Runtime files.

1 files changed, 81 insertions, 0 deletions

diff --git a/src/Native/Runtime/ObjectLayout.h b/src/Native/Runtime/ObjectLayout.h
new file mode 100644
index 000000000..fd53e6ae2
--- /dev/null
+++ b/src/Native/Runtime/ObjectLayout.h
@@ -0,0 +1,81 @@
+//
+// Copyright (c) Microsoft Corporation.  All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+//
+
+//
+// Low-level types describing GC object layouts.
+//
+
+// Bits stolen from the sync block index that the GC/HandleTable knows about (currently these are at the same
+// positions as the mainline runtime but we can change this below when it becomes apparent how Redhawk will
+// handle sync blocks).
+#define BIT_SBLK_GC_RESERVE                 0x20000000
+#define BIT_SBLK_FINALIZER_RUN              0x40000000
+
+// The sync block index header (small structure that immediately precedes every object in the GC heap). Only
+// the GC uses this so far, and only to store a couple of bits of information.
+class ObjHeader
+{
+private:
+#if defined(_WIN64)
+    UInt32   m_uAlignpad;
+#endif // _WIN64
+    UInt32   m_uSyncBlockValue;
+
+public:
+    UInt32 GetBits() { return m_uSyncBlockValue; }
+    void SetBit(UInt32 uBit);
+    void ClrBit(UInt32 uBit);
+    void SetGCBit() { m_uSyncBlockValue |= BIT_SBLK_GC_RESERVE; }
+    void ClrGCBit() { m_uSyncBlockValue &= ~BIT_SBLK_GC_RESERVE; }
+};
+
+//-------------------------------------------------------------------------------------------------
+static UIntNative const SYNC_BLOCK_SKEW  = sizeof(void *);
+
+//-------------------------------------------------------------------------------------------------
+class Object
+{
+    friend class AsmOffsets;
+
+    PTR_EEType  m_pEEType;
+public:  
+    EEType * get_EEType() const
+        { return m_pEEType; }
+    EEType * get_SafeEEType() const
+        { return dac_cast<PTR_EEType>((dac_cast<TADDR>(m_pEEType)) & ~((UIntNative)3)); }
+    ObjHeader * GetHeader() { return dac_cast<DPTR(ObjHeader)>(dac_cast<TADDR>(this) - SYNC_BLOCK_SKEW); }
+#ifndef DACCESS_COMPILE
+    void set_EEType(EEType * pEEType)
+        { m_pEEType = pEEType; }
+    void InitEEType(EEType * pEEType);
+
+    size_t GetSize();
+#endif
+};
+typedef DPTR(Object) PTR_Object;
+typedef DPTR(PTR_Object) PTR_PTR_Object;
+
+//-------------------------------------------------------------------------------------------------
+static UIntNative const MIN_OBJECT_SIZE  = (2 * sizeof(void*)) + sizeof(ObjHeader);
+
+//-------------------------------------------------------------------------------------------------
+static UIntNative const REFERENCE_SIZE   = sizeof(Object *);
+
+//-------------------------------------------------------------------------------------------------
+class Array : public Object
+{
+    friend class AsmOffsets;
+
+    UInt32       m_Length;
+#if defined(_WIN64)
+    UInt32       m_uAlignpad;
+#endif // _WIN64
+public:  
+    UInt32 GetArrayLength();
+    void InitArrayLength(UInt32 length);
+    void* GetArrayData();
+};
+typedef DPTR(Array) PTR_Array;
+