Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / clr / src / BCL / System / Runtime / CompilerServices / jithelpers.cs / 1305376 / jithelpers.cs
// ==++== // // Copyright (c) Microsoft Corporation. All rights reserved. // // ==--== //////////////////////////////////////////////////////////////////////////////// // JitHelpers // Low-level Jit Helpers //////////////////////////////////////////////////////////////////////////////// using System; using System.Threading; using System.Runtime; using System.Runtime.Versioning; using System.Diagnostics.Contracts; using System.Runtime.InteropServices; namespace System.Runtime.CompilerServices { // Wrapper for address of a string variable on stack internal struct StringHandleOnStack { private IntPtr m_ptr; internal StringHandleOnStack(IntPtr pString) { m_ptr = pString; } } // Wrapper for address of a object variable on stack internal struct ObjectHandleOnStack { private IntPtr m_ptr; internal ObjectHandleOnStack(IntPtr pObject) { m_ptr = pObject; } } // Wrapper for StackCrawlMark internal struct StackCrawlMarkHandle { private IntPtr m_ptr; internal StackCrawlMarkHandle(IntPtr stackMark) { m_ptr = stackMark; } } // Helper class to assist with unsafe pinning of arbitrary objects. The typical usage pattern is: // fixed (byte * pData = &JitHelpers.GetPinningHelper(value).m_data) // { // ... pData is what Object::GetData() returns in VM ... // } internal class PinningHelper { #if !FEATURE_CORECLR [System.Runtime.ForceTokenStabilization] #endif //!FEATURE_CORECLR public byte m_data; } internal static class JitHelpers { // The special dll name to be used for DllImport of QCalls internal const string QCall = "QCall"; // Wraps object variable into a handle. Used to return managed strings from QCalls. // s has to be a local variable on the stack. [System.Security.SecurityCritical] // auto-generated #if !FEATURE_CORECLR [TargetedPatchingOptOut("Performance critical to inline across NGen image boundaries")] #endif static internal StringHandleOnStack GetStringHandleOnStack(ref string s) { return new StringHandleOnStack(__makeref(s).GetPointerOnStack()); } // Wraps object variable into a handle. Used to pass managed object references in and out of QCalls. // o has to be a local variable on the stack. [System.Security.SecurityCritical] // auto-generated #if !FEATURE_CORECLR [TargetedPatchingOptOut("Performance critical to inline across NGen image boundaries")] #endif static internal ObjectHandleOnStack GetObjectHandleOnStack(ref T o) where T : class { return new ObjectHandleOnStack(__makeref(o).GetPointerOnStack()); } // Wraps StackCrawlMark into a handle. Used to pass StackCrawlMark to QCalls. // stackMark has to be a local variable on the stack. [System.Security.SecurityCritical] // auto-generated #if !FEATURE_CORECLR [TargetedPatchingOptOut("Performance critical to inline across NGen image boundaries")] #endif static internal StackCrawlMarkHandle GetStackCrawlMarkHandle(ref StackCrawlMark stackMark) { return new StackCrawlMarkHandle(__makeref(stackMark).GetPointerOnStack()); } #if _DEBUG [System.Security.SecuritySafeCritical] // auto-generated static internal T UnsafeCast (Object o) where T : class { // Make sure that both intrinsic and slow versions return same value T ret = UnsafeCastInternal (o); Contract.Assert(ret == (o as T), "Invalid use of JitHelpers.UnsafeCast!"); return ret; } [System.Security.SecurityCritical] static private T UnsafeCastInternal (Object o) where T : class { // The body of this function will be replaced by the EE with unsafe code that just returns o!!! // See getILIntrinsicImplementation for how this happens. return o as T; } [System.Security.SecuritySafeCritical] // auto-generated static internal int UnsafeEnumCast (T val) where T : struct // Actually T must be 4 byte enum { Contract.Assert(typeof(T).IsEnum && Enum.GetUnderlyingType(typeof(T)) == typeof(int), "Error, T must be an enum JitHelpers.UnsafeEnumCast!"); return UnsafeEnumCastInternal (val); } [System.Security.SecuritySafeCritical] // auto-generated static private int UnsafeEnumCastInternal (T val) where T : struct // Actually T must be 4 byte enum { // should be return (int) val; but C# does not allow, runtime does this magically // See getILIntrinsicImplementation for how this happens. throw new InvalidOperationException(); } #else // _DEBUG [System.Security.SecuritySafeCritical] // auto-generated #if !FEATURE_CORECLR [TargetedPatchingOptOut("Performance critical to inline across NGen image boundaries")] #endif static internal T UnsafeCast (Object o) where T : class { // The body of this function will be replaced by the EE with unsafe code that just returns o!!! // See getILIntrinsicImplementation for how this happens. return o as T; } [System.Security.SecuritySafeCritical] // auto-generated #if !FEATURE_CORECLR [TargetedPatchingOptOut("Performance critical to inline across NGen image boundaries")] #endif static internal int UnsafeEnumCast (T val) where T : struct // Actually T must be 4 byte enum { // should be return (int) val; but C# does not allow, runtime does this magically // See getILIntrinsicImplementation for how this happens. throw new InvalidOperationException(); } #endif // _DEBUG // Set the given element in the array without any type or range checks [System.Security.SecurityCritical] // auto-generated [ResourceExposure(ResourceScope.None)] [MethodImplAttribute(MethodImplOptions.InternalCall)] extern static internal void UnsafeSetArrayElement(Object[] target, int index, Object element); // Used for unsafe pinning of arbitrary objects. [System.Security.SecurityCritical] // auto-generated [ResourceExposure(ResourceScope.None)] [MethodImplAttribute(MethodImplOptions.InternalCall)] extern static internal PinningHelper GetPinningHelper(Object o); } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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