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Separate out the virtual memory allocation procedures

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`reserve`, `commit`, `reserve_and_commit`, `decommit`, `release`, `protect`
This commit is contained in:
gingerBill
2021-10-04 16:43:52 +01:00
parent a463609e4c
commit f2e78dcc0b
3 changed files with 98 additions and 50 deletions
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core/mem/virtual/virtual_windows.odin
+31 -23
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@@ -2,8 +2,6 @@
//+private
package mem_virtual
import "core:mem"
foreign import Kernel32 "system:Kernel32.lib"
LPSYSTEM_INFO :: ^SYSTEM_INFO
@@ -60,28 +58,38 @@ foreign Kernel32 {
}
_reserve :: proc(size: uint) -> (data: []byte, err: Allocator_Error) {
result := VirtualAlloc(nil, size, MEM_RELEASE, PAGE_READWRITE)
if result == nil {
err = .Out_Of_Memory
return
}
data = ([^]byte)(result)[:size]
return
}
_commit :: proc(data: rawptr, size: uint) {
VirtualAlloc(data, size, MEM_COMMIT, PAGE_READWRITE)
}
_decommit :: proc(data: rawptr, size: uint) {
VirtualFree(data, size, MEM_DECOMMIT)
}
_release :: proc(data: rawptr, size: uint) {
VirtualFree(data, 0, MEM_RELEASE)
}
_protect :: proc(data: rawptr, size: uint) -> bool {
old_protect: u32
ok := VirtualProtect(data, size, PAGE_NOACCESS, &old_protect)
return bool(ok)
}
_platform_memory_init :: proc() {
sys_info: SYSTEM_INFO
GetSystemInfo(&sys_info)
DEFAULT_PAGE_SIZE = max(DEFAULT_PAGE_SIZE, int(sys_info.dwPageSize))
assert(mem.is_power_of_two(uintptr(DEFAULT_PAGE_SIZE)))
DEFAULT_PAGE_SIZE = max(DEFAULT_PAGE_SIZE, uint(sys_info.dwPageSize))
// is power of two
assert(DEFAULT_PAGE_SIZE != 0 && (DEFAULT_PAGE_SIZE & (DEFAULT_PAGE_SIZE-1)) == 0)
}
_platform_memory_alloc :: proc(total_size: int) -> (pmblock: ^Platform_Memory_Block, err: mem.Allocator_Error) {
pmblock = (^Platform_Memory_Block)(VirtualAlloc(nil, uint(total_size), MEM_RESERVE|MEM_COMMIT, PAGE_READWRITE))
if pmblock == nil {
err = .Out_Of_Memory
}
return
}
_platform_memory_free :: proc(block: ^Platform_Memory_Block) {
VirtualFree(block, 0, MEM_RELEASE)
}
_platform_memory_protect :: proc(memory: rawptr, size: int) -> bool {
old_protect: u32
ok := VirtualProtect(memory, uint(size), PAGE_NOACCESS, &old_protect)
return bool(ok)
}