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//! This module roughly corresponds to `mach/vm_statistics.h`

use core::ffi::{c_uint, c_int};

use crate::vm_types::{integer_t, natural_t};

pub type vm_statistics_t      = *mut vm_statistics;
pub type vm_statistics_data_t = vm_statistics;

pub const VM_PAGE_QUERY_PAGE_PRESENT:    integer_t = 1;
pub const VM_PAGE_QUERY_PAGE_FICTITIOUS: integer_t = 1 << 1;
pub const VM_PAGE_QUERY_PAGE_REF:        integer_t = 1 << 2;
pub const VM_PAGE_QUERY_PAGE_DIRTY:      integer_t = 1 << 3;

pub const VM_MEMORY_MALLOC:                  c_uint = 1;
pub const VM_MEMORY_MALLOC_SMALL:            c_uint = 2;
pub const VM_MEMORY_MALLOC_LARGE:            c_uint = 3;
pub const VM_MEMORY_MALLOC_HUGE:             c_uint = 4;
pub const VM_MEMORY_SBRK:                    c_uint = 5;
pub const VM_MEMORY_ANALYSIS_TOOL:           c_uint = 10;
pub const VM_MEMORY_MACH_MSG:                c_uint = 20;
pub const VM_MEMORY_IOKIT:                   c_uint = 21;
pub const VM_MEMORY_STACK:                   c_uint = 30;
pub const VM_MEMORY_GUARD:                   c_uint = 31;
pub const VM_MEMORY_SHARED_PMAP:             c_uint = 32;
pub const VM_MEMORY_DYLIB:                   c_uint = 33;
pub const VM_MEMORY_APPKIT:                  c_uint = 40;
pub const VM_MEMORY_FOUNDATION:              c_uint = 41;
pub const VM_MEMORY_COREGRAPHICS:            c_uint = 42;
pub const VM_MEMORY_CARBON:                  c_uint = 43;
pub const VM_MEMORY_JAVA:                    c_uint = 44;
pub const VM_MEMORY_ATS:                     c_uint = 50;
pub const VM_MEMORY_DYLD:                    c_uint = 60;
pub const VM_MEMORY_DYLD_MALLOC:             c_uint = 61;
pub const VM_MEMORY_APPLICATION_SPECIFIC_1:  c_uint = 240;
pub const VM_MEMORY_APPLICATION_SPECIFIC_16: c_uint = 255;

pub const VM_FLAGS_FIXED:     c_int = 0x0;
pub const VM_FLAGS_ANYWHERE:  c_int = 0x1;
pub const VM_FLAGS_OVERWRITE: c_int = 0x4000;

#[repr(C)]
#[derive(Copy, Clone, Debug, Default, Hash, PartialOrd, PartialEq, Eq, Ord)]
pub struct vm_statistics {
    pub free_count: natural_t,
    pub active_count: natural_t,
    pub inactive_count: natural_t,
    pub wire_count: natural_t,
    pub zero_fill_count: natural_t,
    pub reactivations: natural_t,
    pub pageins: natural_t,
    pub pageouts: natural_t,
    pub faults: natural_t,
    pub cow_faults: natural_t,
    pub lookups: natural_t,
    pub hits: natural_t,
    pub purgeable_count: natural_t,
    pub purges: natural_t,
    pub speculative_count: natural_t,
}