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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
#ifndef __CORJITHOST_H__
#define __CORJITHOST_H__
// ICorJitHost
//
// ICorJitHost provides the interface that the JIT uses to access some functionality that
// would normally be provided by the operating system. This is intended to allow for
// host-specific policies re: memory allocation, configuration value access, etc. It is
// expected that the `ICorJitHost` value provided to `jitStartup` lives at least as
// long as the JIT itself.
class ICorJitHost
{
public:
// Allocate memory of the given size in bytes.
virtual void* allocateMemory(size_t size) = 0;
// Frees memory previous obtained by a call to `ICorJitHost::allocateMemory`.
virtual void freeMemory(void* block) = 0;
// Return an integer config value for the given key, if any exists.
virtual int getIntConfigValue(
const wchar_t* name,
int defaultValue
) = 0;
// Return a string config value for the given key, if any exists.
virtual const wchar_t* getStringConfigValue(
const wchar_t* name
) = 0;
// Free a string ConfigValue returned by the runtime.
// JITs using the getStringConfigValue query are required
// to return the string values to the runtime for deletion.
// This avoids leaking the memory in the JIT.
virtual void freeStringConfigValue(
const wchar_t* value
) = 0;
// Allocate memory slab of the given size in bytes. The host is expected to pool
// these for a good performance.
virtual void* allocateSlab(size_t size, size_t* pActualSize)
{
*pActualSize = size;
return allocateMemory(size);
}
// Free memory slab of the given size in bytes.
virtual void freeSlab(void* slab, size_t actualSize)
{
freeMemory(slab);
}
};
#endif
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