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/*
* Copyright 2019 Google Inc.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met: redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer;
* redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution;
* neither the name of the copyright holders nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef __SIM_GUEST_ABI_LAYOUT_HH__
#define __SIM_GUEST_ABI_LAYOUT_HH__
#include <type_traits>
#include "base/compiler.hh"
#include "sim/guest_abi/definition.hh"
namespace gem5
{
class ThreadContext;
GEM5_DEPRECATED_NAMESPACE(GuestABI, guest_abi);
namespace guest_abi
{
/*
* State may need to be initialized based on the ThreadContext, for instance
* to find out where the stack pointer is initially.
*/
template <typename ABI, typename Enabled=void>
struct StateInitializer
{
static typename ABI::State
init(const ThreadContext *tc)
{
return typename ABI::State();
}
};
template <typename ABI>
struct StateInitializer<ABI, typename std::enable_if_t<
std::is_constructible<typename ABI::State, const ThreadContext *>::value>>
{
static typename ABI::State
init(const ThreadContext *tc)
{
return typename ABI::State(tc);
}
};
template <typename ABI>
static typename ABI::State
initializeState(const ThreadContext *tc)
{
return StateInitializer<ABI>::init(tc);
}
/*
* This struct template provides a default prepare() method in case the
* Result or Argument template doesn't provide one. This is the default in
* cases where the return or argument type doesn't affect where things are
* stored.
*/
template <typename ABI, template <class ...> class Role,
typename Type, typename Enabled=void>
struct Preparer
{
static void
prepare(ThreadContext *tc, typename ABI::State &state)
{}
};
/*
* If the return or argument type isn't void and does affect where things
* are stored, the ABI can implement a prepare() method for the various
* argument and/or return types, and this specialization will call into it.
*/
template <typename ABI, template <class ...> class Role, typename Type>
struct Preparer<ABI, Role, Type, decltype((void)&Role<ABI, Type>::prepare)>
{
static void
prepare(ThreadContext *tc, typename ABI::State &state)
{
Role<ABI, Type>::prepare(tc, state);
}
};
template <typename ABI, typename Ret, typename Enabled=void>
static inline void
prepareForResult(ThreadContext *tc, typename ABI::State &state)
{
Preparer<ABI, Result, Ret>::prepare(tc, state);
}
template <typename ABI, typename ...Args>
static inline void
prepareForArguments(GEM5_VAR_USED ThreadContext *tc,
typename ABI::State &state)
{
GEM5_FOR_EACH_IN_PACK(Preparer<ABI, Argument, Args>::prepare(tc, state));
}
template <typename ABI, typename Ret, typename ...Args>
static inline void
prepareForFunction(ThreadContext *tc, typename ABI::State &state)
{
prepareForResult<ABI, Ret>(tc, state);
prepareForArguments<ABI, Args...>(tc, state);
}
/*
* This struct template provides a way to call the Result store method and
* optionally pass it the state.
*/
template <typename ABI, typename Ret, typename Enabled=void>
struct ResultStorer
{
static void
store(ThreadContext *tc, const Ret &ret, typename ABI::State &state)
{
Result<ABI, Ret>::store(tc, ret);
}
};
template <typename ABI, typename Ret>
struct ResultStorer<ABI, Ret, typename std::enable_if_t<
std::is_same<void (*)(ThreadContext *, const Ret &, typename ABI::State &),
decltype(&Result<ABI, Ret>::store)>::value>>
{
static void
store(ThreadContext *tc, const Ret &ret, typename ABI::State &state)
{
Result<ABI, Ret>::store(tc, ret, state);
}
};
/*
* Function templates to wrap the Result::store and Argument::get methods.
*/
template <typename ABI, typename Ret>
static void
storeResult(ThreadContext *tc, const Ret &ret, typename ABI::State &state)
{
ResultStorer<ABI, Ret>::store(tc, ret, state);
}
template <typename ABI, typename Arg>
static Arg
getArgument(ThreadContext *tc, typename ABI::State &state)
{
return Argument<ABI, Arg>::get(tc, state);
}
} // namespace guest_abi
} // namespace gem5
#endif // __SIM_GUEST_ABI_LAYOUT_HH__