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//+private
//+build windows
package runtime
import "core:intrinsics"
foreign import kernel32 "system:Kernel32.lib"
@(private="file")
@(default_calling_convention="stdcall")
foreign kernel32 {
// NOTE(bill): The types are not using the standard names (e.g. DWORD and LPVOID) to just minimizing the dependency
// os_write
GetStdHandle :: proc(which: u32) -> rawptr ---
SetHandleInformation :: proc(hObject: rawptr, dwMask: u32, dwFlags: u32) -> b32 ---
WriteFile :: proc(hFile: rawptr, lpBuffer: rawptr, nNumberOfBytesToWrite: u32, lpNumberOfBytesWritten: ^u32, lpOverlapped: rawptr) -> b32 ---
GetLastError :: proc() -> u32 ---
// default_allocator
GetProcessHeap :: proc() -> rawptr ---
HeapAlloc :: proc(hHeap: rawptr, dwFlags: u32, dwBytes: uint) -> rawptr ---
HeapReAlloc :: proc(hHeap: rawptr, dwFlags: u32, lpMem: rawptr, dwBytes: uint) -> rawptr ---
HeapFree :: proc(hHeap: rawptr, dwFlags: u32, lpMem: rawptr) -> b32 ---
}
_os_write :: proc "contextless" (data: []byte) -> (n: int, err: _OS_Errno) #no_bounds_check {
if len(data) == 0 {
return 0, 0;
}
STD_ERROR_HANDLE :: ~u32(0) -12 + 1;
HANDLE_FLAG_INHERIT :: 0x00000001;
MAX_RW :: 1<<30;
h := GetStdHandle(STD_ERROR_HANDLE);
when size_of(uintptr) == 8 {
SetHandleInformation(h, HANDLE_FLAG_INHERIT, 0);
}
single_write_length: u32;
total_write: i64;
length := i64(len(data));
for total_write < length {
remaining := length - total_write;
to_write := u32(min(i32(remaining), MAX_RW));
e := WriteFile(h, &data[total_write], to_write, &single_write_length, nil);
if single_write_length <= 0 || !e {
err = _OS_Errno(GetLastError());
n = int(total_write);
return;
}
total_write += i64(single_write_length);
}
n = int(total_write);
return;
}
heap_alloc :: proc "contextless" (size: int) -> rawptr {
HEAP_ZERO_MEMORY :: 0x00000008;
return HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, uint(size));
}
heap_resize :: proc "contextless" (ptr: rawptr, new_size: int) -> rawptr {
if new_size == 0 {
heap_free(ptr);
return nil;
}
if ptr == nil {
return heap_alloc(new_size);
}
HEAP_ZERO_MEMORY :: 0x00000008;
return HeapReAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, ptr, uint(new_size));
}
heap_free :: proc "contextless" (ptr: rawptr) {
if ptr == nil {
return;
}
HeapFree(GetProcessHeap(), 0, ptr);
}
//
// NOTE(tetra, 2020-01-14): The heap doesn't respect alignment.
// Instead, we overallocate by `alignment + size_of(rawptr) - 1`, and insert
// padding. We also store the original pointer returned by heap_alloc right before
// the pointer we return to the user.
//
_windows_default_alloc_or_resize :: proc "contextless" (size, alignment: int, old_ptr: rawptr = nil) -> ([]byte, Allocator_Error) {
if size == 0 {
_windows_default_free(old_ptr);
return nil, nil;
}
a := max(alignment, align_of(rawptr));
space := size + a - 1;
allocated_mem: rawptr;
if old_ptr != nil {
original_old_ptr := intrinsics.ptr_offset((^rawptr)(old_ptr), -1)^;
allocated_mem = heap_resize(original_old_ptr, space+size_of(rawptr));
} else {
allocated_mem = heap_alloc(space+size_of(rawptr));
}
aligned_mem := rawptr(intrinsics.ptr_offset((^u8)(allocated_mem), size_of(rawptr)));
ptr := uintptr(aligned_mem);
aligned_ptr := (ptr - 1 + uintptr(a)) & -uintptr(a);
diff := int(aligned_ptr - ptr);
if (size + diff) > space {
return nil, .Out_Of_Memory;
}
aligned_mem = rawptr(aligned_ptr);
intrinsics.ptr_offset((^rawptr)(aligned_mem), -1)^ = allocated_mem;
return byte_slice(aligned_mem, size), nil;
}
_windows_default_alloc :: proc "contextless" (size, alignment: int) -> ([]byte, Allocator_Error) {
return _windows_default_alloc_or_resize(size, alignment, nil);
}
_windows_default_free :: proc "contextless" (ptr: rawptr) {
if ptr != nil {
heap_free(intrinsics.ptr_offset((^rawptr)(ptr), -1)^);
}
}
_windows_default_resize :: proc "contextless" (p: rawptr, old_size: int, new_size: int, new_alignment: int) -> ([]byte, Allocator_Error) {
return _windows_default_alloc_or_resize(new_size, new_alignment, p);
}
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