268ef2c059
These capture the primitive architectural operations we are going to use. At the moment, since all AALs and PALs are not StrictProvenance, the only implementations are stubs that just subvert the type system (but give us something to compile against, going forward).
70 lines
1.7 KiB
C++
70 lines
1.7 KiB
C++
#pragma once
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#ifdef __cpp_concepts
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# include "../ds/concept.h"
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# include "../ds/ptrwrap.h"
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# include "aal_consts.h"
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# include <cstdint>
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# include <utility>
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namespace snmalloc
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{
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/**
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* AALs must advertise the bit vector of supported features, their name,
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*
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*/
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template<typename AAL>
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concept ConceptAAL_static_members = requires()
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{
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typename std::integral_constant<uint64_t, AAL::aal_features>;
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typename std::integral_constant<int, AAL::aal_name>;
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};
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/**
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* AALs provide a prefetch operation.
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*/
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template<typename AAL>
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concept ConceptAAL_prefetch = requires(void *ptr)
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{
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{ AAL::prefetch(ptr) } noexcept -> ConceptSame<void>;
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};
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/**
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* AALs provide a notion of high-precision timing.
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*/
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template<typename AAL>
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concept ConceptAAL_tick = requires()
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{
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{ AAL::tick() } noexcept -> ConceptSame<uint64_t>;
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};
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template<typename AAL>
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concept ConceptAAL_capptr_methods =
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requires(CapPtr<void, CBArena> auth, CapPtr<void, CBAlloc> ret, size_t sz)
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{
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/**
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* Produce a pointer with reduced authority from a more privilged pointer.
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* The resulting pointer will have base at auth's address and length of
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* exactly sz. auth+sz must not exceed auth's limit.
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*/
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{ AAL::template capptr_bound<void, CBChunk>(auth, sz) } noexcept
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-> ConceptSame<CapPtr<void, CBChunk>>;
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/**
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* Construct a copy of auth with its target set to that of ret.
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*/
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{ AAL::capptr_rebound(auth, ret) } noexcept
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-> ConceptSame<CapPtr<void, CBArena>>;
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};
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template<typename AAL>
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concept ConceptAAL =
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ConceptAAL_static_members<AAL> &&
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ConceptAAL_prefetch<AAL> &&
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ConceptAAL_tick<AAL> &&
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ConceptAAL_capptr_methods<AAL>;
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} // namespace snmalloc
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#endif
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