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// AsmJit - Machine code generation for C++
//
// * Official AsmJit Home Page: https://asmjit.com
// * Official Github Repository: https://github.com/asmjit/asmjit
//
// Copyright (c) 2008-2020 The AsmJit Authors
//
// This software is provided 'as-is', without any express or implied
// warranty. In no event will the authors be held liable for any damages
// arising from the use of this software.
//
// Permission is granted to anyone to use this software for any purpose,
// including commercial applications, and to alter it and redistribute it
// freely, subject to the following restrictions:
//
// 1. The origin of this software must not be misrepresented; you must not
// claim that you wrote the original software. If you use this software
// in a product, an acknowledgment in the product documentation would be
// appreciated but is not required.
// 2. Altered source versions must be plainly marked as such, and must not be
// misrepresented as being the original software.
// 3. This notice may not be removed or altered from any source distribution.
#ifndef ASMJIT_CORE_JITRUNTIME_H_INCLUDED
#define ASMJIT_CORE_JITRUNTIME_H_INCLUDED
#include "../core/api-config.h"
#ifndef ASMJIT_NO_JIT
#include "../core/codeholder.h"
#include "../core/jitallocator.h"
#include "../core/target.h"
ASMJIT_BEGIN_NAMESPACE
class CodeHolder;
//! \addtogroup asmjit_virtual_memory
//! \{
// ============================================================================
// [asmjit::JitRuntime]
// ============================================================================
//! JIT execution runtime is a special `Target` that is designed to store and
//! execute the generated code.
class ASMJIT_VIRTAPI JitRuntime : public Target {
public:
ASMJIT_NONCOPYABLE(JitRuntime)
//! Virtual memory allocator.
JitAllocator _allocator;
//! \name Construction & Destruction
//! \{
//! Creates a `JitRuntime` instance.
explicit ASMJIT_API JitRuntime(const JitAllocator::CreateParams* params = nullptr) noexcept;
//! Destroys the `JitRuntime` instance.
ASMJIT_API virtual ~JitRuntime() noexcept;
inline void reset(uint32_t resetPolicy = Globals::kResetSoft) noexcept {
_allocator.reset(resetPolicy);
}
//! \}
//! \name Accessors
//! \{
//! Returns the associated `JitAllocator`.
inline JitAllocator* allocator() const noexcept { return const_cast<JitAllocator*>(&_allocator); }
//! \}
//! \name Utilities
//! \{
// NOTE: To allow passing function pointers to `add()` and `release()` the
// virtual methods are prefixed with `_` and called from templates instead.
//! Allocates memory needed for a code stored in the `CodeHolder` and relocates
//! the code to the pointer allocated.
//!
//! The beginning of the memory allocated for the function is returned in `dst`.
//! If failed `Error` code is returned and `dst` is explicitly set to `nullptr`
//! (this means that you don't have to set it to null before calling `add()`).
template<typename Func>
inline Error add(Func* dst, CodeHolder* code) noexcept {
return _add(Support::ptr_cast_impl<void**, Func*>(dst), code);
}
//! Releases `p` which was obtained by calling `add()`.
template<typename Func>
inline Error release(Func p) noexcept {
return _release(Support::ptr_cast_impl<void*, Func>(p));
}
//! Type-unsafe version of `add()`.
ASMJIT_API virtual Error _add(void** dst, CodeHolder* code) noexcept;
//! Type-unsafe version of `release()`.
ASMJIT_API virtual Error _release(void* p) noexcept;
//! Flushes an instruction cache.
//!
//! This member function is called after the code has been copied to the
//! destination buffer. It is only useful for JIT code generation as it
//! causes a flush of the processor's cache.
//!
//! Flushing is basically a NOP under X86, but is needed by architectures
//! that do not have a transparent instruction cache like ARM.
//!
//! This function can also be overridden to improve compatibility with tools
//! such as Valgrind, however, it's not an official part of AsmJit.
ASMJIT_API virtual void flush(const void* p, size_t size) noexcept;
//! \}
};
//! \}
ASMJIT_END_NAMESPACE
#endif
#endif
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