sysio::vm::contiguous_allocator Class Reference

#include <allocator.hpp>

Public Member Functions
	contiguous_allocator (size_t size)
	~contiguous_allocator ()
template<typename T >
T *	alloc (size_t size=0)
template<typename T >
void	reclaim (const T *ptr, size_t size=0)
void	free ()
	contiguous_allocator (size_t size)
	~contiguous_allocator ()
template<typename T >
T *	alloc (size_t size=0)
template<typename T >
void	reclaim (const T *ptr, size_t size=0)
void	free ()

Static Public Member Functions
template<std::size_t align_amt>
static constexpr size_t	align_offset (size_t offset)
static std::size_t	align_to_page (std::size_t offset)
template<std::size_t align_amt>
static constexpr size_t	align_offset (size_t offset)
static std::size_t	align_to_page (std::size_t offset)

Detailed Description

Definition at line 82 of file allocator.hpp.

Constructor & Destructor Documentation

contiguous_allocator() [1/2]

sysio::vm::contiguous_allocator::contiguous_allocator ( size_t size )

inline

Definition at line 92 of file allocator.hpp.

                                           {
            _size = align_to_page(size);
            _base = (char*)mmap(NULL, _size, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
            SYS_VM_ASSERT(_base != MAP_FAILED, wasm_bad_alloc, "mmap failed.");
         }

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~contiguous_allocator() [1/2]

sysio::vm::contiguous_allocator::~contiguous_allocator ( )

inline

Definition at line 97 of file allocator.hpp.

{ munmap(_base, align_to_page(_size)); }

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contiguous_allocator() [2/2]

sysio::vm::contiguous_allocator::contiguous_allocator ( size_t size )

inline

Definition at line 92 of file allocator.hpp.

                                           {
            _size = align_to_page(size);
            _base = (char*)mmap(NULL, _size, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
            SYS_VM_ASSERT(_base != MAP_FAILED, wasm_bad_alloc, "mmap failed.");
         }

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~contiguous_allocator() [2/2]

sysio::vm::contiguous_allocator::~contiguous_allocator ( )

inline

Definition at line 97 of file allocator.hpp.

{ munmap(_base, align_to_page(_size)); }

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Member Function Documentation

align_offset() [1/2]

template<std::size_t align_amt>

static constexpr size_t sysio::vm::contiguous_allocator::align_offset ( size_t offset )

inlinestaticconstexpr

Definition at line 85 of file allocator.hpp.

{ return (offset + align_amt - 1) & ~(align_amt - 1); }

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align_offset() [2/2]

template<std::size_t align_amt>

static constexpr size_t sysio::vm::contiguous_allocator::align_offset ( size_t offset )

inlinestaticconstexpr

Definition at line 85 of file allocator.hpp.

{ return (offset + align_amt - 1) & ~(align_amt - 1); }

align_to_page() [1/2]

static std::size_t sysio::vm::contiguous_allocator::align_to_page ( std::size_t offset )

inlinestatic

Definition at line 87 of file allocator.hpp.

                                                          {
            std::size_t pagesize = static_cast<std::size_t>(::sysconf(_SC_PAGESIZE));
            return (offset + pagesize - 1) & ~(pagesize - 1);
         }

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align_to_page() [2/2]

static std::size_t sysio::vm::contiguous_allocator::align_to_page ( std::size_t offset )

inlinestatic

Definition at line 87 of file allocator.hpp.

                                                          {
            std::size_t pagesize = static_cast<std::size_t>(::sysconf(_SC_PAGESIZE));
            return (offset + pagesize - 1) & ~(pagesize - 1);
         }

alloc() [1/2]

template<typename T >

T * sysio::vm::contiguous_allocator::alloc ( size_t size = 0 )

inline

Definition at line 100 of file allocator.hpp.

                                   {
            _offset = align_offset<alignof(T)>(_offset);
            size_t aligned = (sizeof(T) * size) + _offset;
            if (aligned > _size) {
               size_t new_size = align_to_page(aligned);
               char* new_base = (char*)mmap(NULL, new_size, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
               SYS_VM_ASSERT(new_base != MAP_FAILED, wasm_bad_alloc, "mmap failed.");
               memcpy(new_base, _base, _size);
               munmap(_base, _size);
               _size = new_size;
               _base = new_base;
            }
            T* ptr = (T*)(_base + _offset);
            _offset = aligned;
            return ptr;
         }

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alloc() [2/2]

template<typename T >

T * sysio::vm::contiguous_allocator::alloc ( size_t size = 0 )

inline

Definition at line 100 of file allocator.hpp.

                                   {
            _offset = align_offset<alignof(T)>(_offset);
            size_t aligned = (sizeof(T) * size) + _offset;
            if (aligned > _size) {
               size_t new_size = align_to_page(aligned);
               char* new_base = (char*)mmap(NULL, new_size, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
               SYS_VM_ASSERT(new_base != MAP_FAILED, wasm_bad_alloc, "mmap failed.");
               memcpy(new_base, _base, _size);
               munmap(_base, _size);
               _size = new_size;
               _base = new_base;
            }
            T* ptr = (T*)(_base + _offset);
            _offset = aligned;
            return ptr;
         }

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free() [1/2]

void sysio::vm::contiguous_allocator::free ( )

inline

Definition at line 118 of file allocator.hpp.

{ /* noop for now */ }

free() [2/2]

void sysio::vm::contiguous_allocator::free ( )

inline

Definition at line 118 of file allocator.hpp.

{ /* noop for now */ }

reclaim() [1/2]

template<typename T >

void sysio::vm::contiguous_allocator::reclaim ( const T * ptr, size_t size = 0 )

inline

Definition at line 117 of file allocator.hpp.

{ /* noop for now */ }

reclaim() [2/2]

template<typename T >

void sysio::vm::contiguous_allocator::reclaim ( const T * ptr, size_t size = 0 )

inline

Definition at line 117 of file allocator.hpp.

{ /* noop for now */ }

---

The documentation for this class was generated from the following files:

• libraries/sys-vm/include/sysio/sysio/vm/allocator.hpp
• libraries/sys-vm/include/sysio/vm/allocator.hpp