Code:
/ Net / Net / 3.5.50727.3053 / DEVDIV / depot / DevDiv / releases / whidbey / netfxsp / ndp / clr / src / BCL / System / Runtime / CompilerServices / RuntimeHelpers.cs / 5 / RuntimeHelpers.cs
// ==++==
//
// Copyright (c) Microsoft Corporation. All rights reserved.
//
// ==--==
////////////////////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////////////
//
// RuntimeHelpers
// This class defines a set of static methods that provide support for compilers.
//
// Date: April 2000
//
namespace System.Runtime.CompilerServices {
using System;
using System.Runtime.CompilerServices;
using System.Runtime.InteropServices;
using System.Runtime.ConstrainedExecution;
using System.Security.Permissions;
using System.Threading;
public static class RuntimeHelpers
{
[MethodImplAttribute(MethodImplOptions.InternalCall)]
public static extern void InitializeArray(Array array,RuntimeFieldHandle fldHandle);
// GetObjectValue is intended to allow value classes to be manipulated as 'Object'
// but have aliasing behavior of a value class. The intent is that you would use
// this function just before an assignment to a variable of type 'Object'. If the
// value being assigned is a mutable value class, then a shallow copy is returned
// (because value classes have copy semantics), but otherwise the object itself
// is returned.
//
// Note: VB calls this method when they're about to assign to an Object
// or pass it as a parameter. The goal is to make sure that boxed
// value types work identical to unboxed value types - ie, they get
// cloned when you pass them around, and are always passed by value.
// Of course, reference types are not cloned.
//
[MethodImplAttribute(MethodImplOptions.InternalCall)]
public static extern Object GetObjectValue(Object obj);
// RunClassConstructor causes the class constructor for the given type to be triggered
// in the current domain. After this call returns, the class constructor is guaranteed to
// have at least been started by some thread. In the absence of class constructor
// deadlock conditions, the call is further guaranteed to have completed.
//
// This call will generate an exception if the specified class constructor threw an
// exception when it ran.
[MethodImplAttribute(MethodImplOptions.InternalCall)]
private static extern void _RunClassConstructor(IntPtr type);
public static void RunClassConstructor(RuntimeTypeHandle type)
{
_RunClassConstructor(type.Value);
}
// RunModuleConstructor causes the module constructor for the given type to be triggered
// in the current domain. After this call returns, the module constructor is guaranteed to
// have at least been started by some thread. In the absence of module constructor
// deadlock conditions, the call is further guaranteed to have completed.
//
// This call will generate an exception if the specified module constructor threw an
// exception when it ran.
[MethodImplAttribute(MethodImplOptions.InternalCall)]
private static extern void _RunModuleConstructor(IntPtr module);
public static void RunModuleConstructor(ModuleHandle module)
{
unsafe {
_RunModuleConstructor(new IntPtr(module.Value));
}
}
[MethodImplAttribute(MethodImplOptions.InternalCall)]
private static extern void _PrepareMethod(IntPtr method, RuntimeTypeHandle[] instantiation);
[MethodImplAttribute(MethodImplOptions.InternalCall)]
internal static extern void _CompileMethod(IntPtr method);
// Simple (instantiation not required) method.
[SecurityPermission(SecurityAction.LinkDemand, UnmanagedCode=true)]
public static void PrepareMethod(RuntimeMethodHandle method)
{
_PrepareMethod(method.Value, null);
}
// Generic method or method with generic class with specific instantiation.
[SecurityPermission(SecurityAction.LinkDemand, UnmanagedCode=true)]
public static void PrepareMethod(RuntimeMethodHandle method, RuntimeTypeHandle[] instantiation)
{
_PrepareMethod(method.Value, instantiation);
}
// This method triggers a given delegate to be prepared. This involves preparing the
// delegate's Invoke method and preparing the target of that Invoke. In the case of
// a multi-cast delegate, we rely on the fact that each individual component was prepared
// prior to the Combine. In other words, this service does not navigate through the
// entire multicasting list.
// If our own reliable event sinks perform the Combine (for example AppDomain.DomainUnload),
// then the result is fully prepared. But if a client calls Combine himself and then
// then adds that combination to e.g. AppDomain.DomainUnload, then the client is responsible
// for his own preparation.
[MethodImplAttribute(MethodImplOptions.InternalCall)]
[SecurityPermission(SecurityAction.LinkDemand, UnmanagedCode=true)]
public static extern void PrepareDelegate(Delegate d);
public static int GetHashCode(Object o)
{
return Object.InternalGetHashCode(o);
}
public new static bool Equals(Object o1, Object o2)
{
return Object.InternalEquals(o1, o2);
}
public static int OffsetToStringData
{
get {
// Number of bytes from the address pointed to by a reference to
// a String to the first 16-bit character in the String. Skip
// over the MethodTable pointer, String capacity, & String
// length. Of course, the String reference points to the memory
// after the [....] block, so don't count that.
// This property allows C#'s fixed statement to work on Strings.
// On 64 bit platforms, this should be 16.
#if WIN32
return 12;
#else
return 16;
#endif
}
}
[MethodImplAttribute(MethodImplOptions.InternalCall)]
[SecurityPermission(SecurityAction.LinkDemand, UnmanagedCode=true)]
[ReliabilityContract(Consistency.WillNotCorruptState, Cer.MayFail)]
public static extern void ProbeForSufficientStack();
// This method is a marker placed immediately before a try clause to mark the corresponding catch and finally blocks as
// constrained. There's no code here other than the probe because most of the work is done at JIT time when we spot a call to this routine.
[SecurityPermission(SecurityAction.LinkDemand, UnmanagedCode=true)]
[ReliabilityContract(Consistency.WillNotCorruptState, Cer.MayFail)]
public static void PrepareConstrainedRegions()
{
ProbeForSufficientStack();
}
// When we detect a CER with no calls, we can point the JIT to this non-probing version instead
// as we don't need to probe.
[SecurityPermission(SecurityAction.LinkDemand, UnmanagedCode=true)]
[ReliabilityContract(Consistency.WillNotCorruptState, Cer.MayFail)]
public static void PrepareConstrainedRegionsNoOP()
{
}
public delegate void TryCode(Object userData);
public delegate void CleanupCode(Object userData, bool exceptionThrown);
[MethodImplAttribute(MethodImplOptions.InternalCall)]
[SecurityPermission(SecurityAction.LinkDemand, UnmanagedCode=true)]
public static extern void ExecuteCodeWithGuaranteedCleanup(TryCode code, CleanupCode backoutCode, Object userData);
[PrePrepareMethod]
internal static void ExecuteBackoutCodeHelper(Object backoutCode, Object userData, bool exceptionThrown)
{
((CleanupCode)backoutCode)(userData, exceptionThrown);
}
// Roughly equivalent to a CER try/finally that will take a lock, run
// the try code, and in the finally block, release the lock. Calls
// ExecuteCodeWithGuaranteedCleanup to ensure this will work w.r.t.
// stack overflows.
// We should consider making this public.
[SecurityPermission(SecurityAction.LinkDemand, UnmanagedCode=true)]
[HostProtection(Synchronization=true)]
internal static void ExecuteCodeWithLock(Object lockObject, TryCode code, object userState)
{
ExecuteWithLockHelper execHelper = new ExecuteWithLockHelper(lockObject, code, userState);
ExecuteCodeWithGuaranteedCleanup(s_EnterMonitor, s_ExitMonitor, execHelper);
}
private static TryCode s_EnterMonitor = new TryCode(EnterMonitorAndTryCode);
private static CleanupCode s_ExitMonitor = new CleanupCode(ExitMonitorOnBackout);
private static void EnterMonitorAndTryCode(Object helper)
{
ExecuteWithLockHelper execHelper = (ExecuteWithLockHelper) helper;
BCLDebug.Assert(execHelper != null, "ExecuteWithLockHelper is null");
BCLDebug.Assert(execHelper.m_lockObject != null, "LockObject is null");
BCLDebug.Assert(execHelper.m_userCode != null, "UserCode is null");
Monitor.ReliableEnter(execHelper.m_lockObject, ref execHelper.m_tookLock);
execHelper.m_userCode(execHelper.m_userState);
}
[PrePrepareMethod]
private static void ExitMonitorOnBackout(Object helper, bool exceptionThrown)
{
ExecuteWithLockHelper execHelper = (ExecuteWithLockHelper) helper;
BCLDebug.Assert(execHelper != null, "ExecuteWithLockHelper is null");
BCLDebug.Assert(execHelper.m_lockObject != null, "LockObject is null");
if (execHelper.m_tookLock)
Monitor.Exit(execHelper.m_lockObject);
}
class ExecuteWithLockHelper
{
internal Object m_lockObject;
internal bool m_tookLock;
internal TryCode m_userCode;
internal object m_userState;
internal ExecuteWithLockHelper(Object lockObject, TryCode userCode, object userState)
{
m_lockObject = lockObject;
m_userCode = userCode;
m_userState = userState;
}
}
}
}
// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// ==++==
//
// Copyright (c) Microsoft Corporation. All rights reserved.
//
// ==--==
////////////////////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////////////
//
// RuntimeHelpers
// This class defines a set of static methods that provide support for compilers.
//
// Date: April 2000
//
namespace System.Runtime.CompilerServices {
using System;
using System.Runtime.CompilerServices;
using System.Runtime.InteropServices;
using System.Runtime.ConstrainedExecution;
using System.Security.Permissions;
using System.Threading;
public static class RuntimeHelpers
{
[MethodImplAttribute(MethodImplOptions.InternalCall)]
public static extern void InitializeArray(Array array,RuntimeFieldHandle fldHandle);
// GetObjectValue is intended to allow value classes to be manipulated as 'Object'
// but have aliasing behavior of a value class. The intent is that you would use
// this function just before an assignment to a variable of type 'Object'. If the
// value being assigned is a mutable value class, then a shallow copy is returned
// (because value classes have copy semantics), but otherwise the object itself
// is returned.
//
// Note: VB calls this method when they're about to assign to an Object
// or pass it as a parameter. The goal is to make sure that boxed
// value types work identical to unboxed value types - ie, they get
// cloned when you pass them around, and are always passed by value.
// Of course, reference types are not cloned.
//
[MethodImplAttribute(MethodImplOptions.InternalCall)]
public static extern Object GetObjectValue(Object obj);
// RunClassConstructor causes the class constructor for the given type to be triggered
// in the current domain. After this call returns, the class constructor is guaranteed to
// have at least been started by some thread. In the absence of class constructor
// deadlock conditions, the call is further guaranteed to have completed.
//
// This call will generate an exception if the specified class constructor threw an
// exception when it ran.
[MethodImplAttribute(MethodImplOptions.InternalCall)]
private static extern void _RunClassConstructor(IntPtr type);
public static void RunClassConstructor(RuntimeTypeHandle type)
{
_RunClassConstructor(type.Value);
}
// RunModuleConstructor causes the module constructor for the given type to be triggered
// in the current domain. After this call returns, the module constructor is guaranteed to
// have at least been started by some thread. In the absence of module constructor
// deadlock conditions, the call is further guaranteed to have completed.
//
// This call will generate an exception if the specified module constructor threw an
// exception when it ran.
[MethodImplAttribute(MethodImplOptions.InternalCall)]
private static extern void _RunModuleConstructor(IntPtr module);
public static void RunModuleConstructor(ModuleHandle module)
{
unsafe {
_RunModuleConstructor(new IntPtr(module.Value));
}
}
[MethodImplAttribute(MethodImplOptions.InternalCall)]
private static extern void _PrepareMethod(IntPtr method, RuntimeTypeHandle[] instantiation);
[MethodImplAttribute(MethodImplOptions.InternalCall)]
internal static extern void _CompileMethod(IntPtr method);
// Simple (instantiation not required) method.
[SecurityPermission(SecurityAction.LinkDemand, UnmanagedCode=true)]
public static void PrepareMethod(RuntimeMethodHandle method)
{
_PrepareMethod(method.Value, null);
}
// Generic method or method with generic class with specific instantiation.
[SecurityPermission(SecurityAction.LinkDemand, UnmanagedCode=true)]
public static void PrepareMethod(RuntimeMethodHandle method, RuntimeTypeHandle[] instantiation)
{
_PrepareMethod(method.Value, instantiation);
}
// This method triggers a given delegate to be prepared. This involves preparing the
// delegate's Invoke method and preparing the target of that Invoke. In the case of
// a multi-cast delegate, we rely on the fact that each individual component was prepared
// prior to the Combine. In other words, this service does not navigate through the
// entire multicasting list.
// If our own reliable event sinks perform the Combine (for example AppDomain.DomainUnload),
// then the result is fully prepared. But if a client calls Combine himself and then
// then adds that combination to e.g. AppDomain.DomainUnload, then the client is responsible
// for his own preparation.
[MethodImplAttribute(MethodImplOptions.InternalCall)]
[SecurityPermission(SecurityAction.LinkDemand, UnmanagedCode=true)]
public static extern void PrepareDelegate(Delegate d);
public static int GetHashCode(Object o)
{
return Object.InternalGetHashCode(o);
}
public new static bool Equals(Object o1, Object o2)
{
return Object.InternalEquals(o1, o2);
}
public static int OffsetToStringData
{
get {
// Number of bytes from the address pointed to by a reference to
// a String to the first 16-bit character in the String. Skip
// over the MethodTable pointer, String capacity, & String
// length. Of course, the String reference points to the memory
// after the [....] block, so don't count that.
// This property allows C#'s fixed statement to work on Strings.
// On 64 bit platforms, this should be 16.
#if WIN32
return 12;
#else
return 16;
#endif
}
}
[MethodImplAttribute(MethodImplOptions.InternalCall)]
[SecurityPermission(SecurityAction.LinkDemand, UnmanagedCode=true)]
[ReliabilityContract(Consistency.WillNotCorruptState, Cer.MayFail)]
public static extern void ProbeForSufficientStack();
// This method is a marker placed immediately before a try clause to mark the corresponding catch and finally blocks as
// constrained. There's no code here other than the probe because most of the work is done at JIT time when we spot a call to this routine.
[SecurityPermission(SecurityAction.LinkDemand, UnmanagedCode=true)]
[ReliabilityContract(Consistency.WillNotCorruptState, Cer.MayFail)]
public static void PrepareConstrainedRegions()
{
ProbeForSufficientStack();
}
// When we detect a CER with no calls, we can point the JIT to this non-probing version instead
// as we don't need to probe.
[SecurityPermission(SecurityAction.LinkDemand, UnmanagedCode=true)]
[ReliabilityContract(Consistency.WillNotCorruptState, Cer.MayFail)]
public static void PrepareConstrainedRegionsNoOP()
{
}
public delegate void TryCode(Object userData);
public delegate void CleanupCode(Object userData, bool exceptionThrown);
[MethodImplAttribute(MethodImplOptions.InternalCall)]
[SecurityPermission(SecurityAction.LinkDemand, UnmanagedCode=true)]
public static extern void ExecuteCodeWithGuaranteedCleanup(TryCode code, CleanupCode backoutCode, Object userData);
[PrePrepareMethod]
internal static void ExecuteBackoutCodeHelper(Object backoutCode, Object userData, bool exceptionThrown)
{
((CleanupCode)backoutCode)(userData, exceptionThrown);
}
// Roughly equivalent to a CER try/finally that will take a lock, run
// the try code, and in the finally block, release the lock. Calls
// ExecuteCodeWithGuaranteedCleanup to ensure this will work w.r.t.
// stack overflows.
// We should consider making this public.
[SecurityPermission(SecurityAction.LinkDemand, UnmanagedCode=true)]
[HostProtection(Synchronization=true)]
internal static void ExecuteCodeWithLock(Object lockObject, TryCode code, object userState)
{
ExecuteWithLockHelper execHelper = new ExecuteWithLockHelper(lockObject, code, userState);
ExecuteCodeWithGuaranteedCleanup(s_EnterMonitor, s_ExitMonitor, execHelper);
}
private static TryCode s_EnterMonitor = new TryCode(EnterMonitorAndTryCode);
private static CleanupCode s_ExitMonitor = new CleanupCode(ExitMonitorOnBackout);
private static void EnterMonitorAndTryCode(Object helper)
{
ExecuteWithLockHelper execHelper = (ExecuteWithLockHelper) helper;
BCLDebug.Assert(execHelper != null, "ExecuteWithLockHelper is null");
BCLDebug.Assert(execHelper.m_lockObject != null, "LockObject is null");
BCLDebug.Assert(execHelper.m_userCode != null, "UserCode is null");
Monitor.ReliableEnter(execHelper.m_lockObject, ref execHelper.m_tookLock);
execHelper.m_userCode(execHelper.m_userState);
}
[PrePrepareMethod]
private static void ExitMonitorOnBackout(Object helper, bool exceptionThrown)
{
ExecuteWithLockHelper execHelper = (ExecuteWithLockHelper) helper;
BCLDebug.Assert(execHelper != null, "ExecuteWithLockHelper is null");
BCLDebug.Assert(execHelper.m_lockObject != null, "LockObject is null");
if (execHelper.m_tookLock)
Monitor.Exit(execHelper.m_lockObject);
}
class ExecuteWithLockHelper
{
internal Object m_lockObject;
internal bool m_tookLock;
internal TryCode m_userCode;
internal object m_userState;
internal ExecuteWithLockHelper(Object lockObject, TryCode userCode, object userState)
{
m_lockObject = lockObject;
m_userCode = userCode;
m_userState = userState;
}
}
}
}
// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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