8e5514bd5a
* clean up unused usages Signed-off-by: SchrodingerZhu <i@zhuyi.fan> * remove names for arg pack Signed-off-by: SchrodingerZhu <i@zhuyi.fan> * fix namespace in setup.h Signed-off-by: SchrodingerZhu <i@zhuyi.fan> * format Signed-off-by: SchrodingerZhu <i@zhuyi.fan> * set UNUSED as fast path Signed-off-by: SchrodingerZhu <i@zhuyi.fan>
99 lines
2.2 KiB
C++
99 lines
2.2 KiB
C++
#ifndef SNMALLOC_PAL_NO_ALLOC_H
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#define SNMALLOC_PAL_NO_ALLOC_H
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#pragma once
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#include "../aal/aal.h"
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#include "pal_concept.h"
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#include "pal_consts.h"
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#include "pal_timer_default.h"
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#include <cstring>
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namespace snmalloc
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{
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#ifdef __cpp_concepts
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/**
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* The minimal subset of a PAL that we need for delegation
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*/
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template<typename PAL>
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concept PALNoAllocBase = ConceptPAL_static_sizes<PAL>&& ConceptPAL_error<PAL>;
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#endif
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/**
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* Platform abstraction layer that does not allow allocation.
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*
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* This is a minimal PAL for pre-reserved memory regions, where the
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* address-space manager is initialised with all of the memory that it will
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* ever use.
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*/
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template<SNMALLOC_CONCEPT(PALNoAllocBase) BasePAL>
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struct PALNoAlloc : public BasePAL
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{
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/**
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* Bitmap of PalFeatures flags indicating the optional features that this
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* PAL supports.
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*/
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static constexpr uint64_t pal_features = NoAllocation;
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static constexpr size_t page_size = BasePAL::page_size;
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static constexpr size_t address_bits = BasePAL::address_bits;
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/**
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* Print a stack trace.
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*/
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static void print_stack_trace()
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{
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BasePAL::print_stack_trace();
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}
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/**
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* Report a fatal error an exit.
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*/
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[[noreturn]] static void error(const char* const str) noexcept
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{
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BasePAL::error(str);
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}
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/**
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* Notify platform that we will not be using these pages.
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*
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* This is a no-op in this stub.
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*/
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static void notify_not_using(void*, size_t) noexcept {}
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/**
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* Notify platform that we will be using these pages.
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*
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* This is a no-op in this stub, except for zeroing memory if required.
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*/
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template<ZeroMem zero_mem>
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static void notify_using(void* p, size_t size) noexcept
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{
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if constexpr (zero_mem == YesZero)
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{
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zero<true>(p, size);
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}
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else
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{
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UNUSED(p, size);
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}
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}
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/**
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* OS specific function for zeroing memory.
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*
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* This just calls memset - we don't assume that we have access to any
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* virtual-memory functions.
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*/
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template<bool page_aligned = false>
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static void zero(void* p, size_t size) noexcept
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{
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memset(p, 0, size);
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}
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};
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} // namespace snmalloc
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#endif
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