93 lines
2.2 KiB
V
93 lines
2.2 KiB
V
module builtin
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import dlmalloc
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fn mm_alloc(size u64) (&byte, Errno) {
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// BEGIN CONSTS
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// the constants need to be here, since the initialization of other constants,
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// which happen before these ones would, require malloc
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mem_prot := MemProt(int(MemProt.prot_read) | int(MemProt.prot_write))
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map_flags := MapFlags(int(MapFlags.map_private) | int(MapFlags.map_anonymous))
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// END CONSTS
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a, e := sys_mmap(&u8(0), size + sizeof(u64), mem_prot, map_flags, -1, 0)
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if e == .enoerror {
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unsafe {
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mut ap := &u64(a)
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*ap = size
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x2 := &u8(a + sizeof(u64))
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return x2, e
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}
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}
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return &u8(0), e
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}
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fn mm_free(addr &u8) Errno {
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unsafe {
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ap := &u64(addr - sizeof(u64))
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size := *ap
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return sys_munmap(addr - sizeof(u64), size + sizeof(u64))
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}
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}
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fn system_alloc(_ voidptr, size usize) (voidptr, usize, u32) {
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// BEGIN CONSTS
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// the constants need to be here, since the initialization of other constants,
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// which happen before these ones would, require malloc
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mem_prot := MemProt(int(MemProt.prot_read) | int(MemProt.prot_write))
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map_flags := MapFlags(int(MapFlags.map_private) | int(MapFlags.map_anonymous))
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// END CONSTS
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a, e := sys_mmap(&u8(0), u64(size), mem_prot, map_flags, -1, 0)
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if e == .enoerror {
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return a, size, 0
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}
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return voidptr(0), 0, 0
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}
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fn system_remap(_ voidptr, ptr voidptr, oldsize usize, newsize usize, can_move bool) voidptr {
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return voidptr(0)
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}
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fn system_free_part(_ voidptr, ptr voidptr, oldsize usize, newsize usize) bool {
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_, e := sys_mremap(ptr, u64(oldsize), u64(newsize), 0)
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if e == .enoerror {
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return true
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}
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e2 := sys_munmap(voidptr(usize(ptr) + newsize), u64(oldsize - newsize))
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return e2 == .enoerror
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}
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fn system_free(_ voidptr, ptr voidptr, size usize) bool {
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unsafe {
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return sys_munmap(ptr, u64(size)) == .enoerror
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}
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}
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fn system_can_release_part(_ voidptr, _ u32) bool {
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return true
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}
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fn system_allocates_zeros(_ voidptr) bool {
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return true
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}
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fn system_page_size(_ voidptr) usize {
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return 4096
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}
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fn get_linux_allocator() dlmalloc.Allocator {
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return dlmalloc.Allocator{
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alloc: system_alloc
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remap: system_remap
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free_part: system_free_part
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free_: system_free
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can_release_part: system_can_release_part
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allocates_zeros: system_allocates_zeros
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page_size: system_page_size
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data: voidptr(0)
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}
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}
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