1
0
Fork 0
mirror of https://github.com/ruby/ruby.git synced 2022-11-09 12:17:21 -05:00
ruby--ruby/coroutine/win32/Context.h

58 lines
1.6 KiB
C
Raw Normal View History

/*
* This file is part of the "Coroutine" project and released under the MIT License.
*
* Created by Samuel Williams on 10/5/2018.
* Copyright, 2018, by Samuel Williams. All rights reserved.
*/
#pragma once
#include <assert.h>
#include <string.h>
#define COROUTINE __declspec(noreturn) void __fastcall
#define COROUTINE_LIMITED_ADDRESS_SPACE
/* This doesn't include thread information block */
enum {COROUTINE_REGISTERS = 4};
struct coroutine_context
{
void **stack_pointer;
};
typedef void(__fastcall * coroutine_start)(struct coroutine_context *from, struct coroutine_context *self);
static inline void coroutine_initialize_main(struct coroutine_context * context) {
context->stack_pointer = NULL;
}
static inline void coroutine_initialize(
struct coroutine_context *context,
coroutine_start start,
void *stack,
size_t size
) {
assert(start && stack && size >= 1024);
// Stack grows down. Force 16-byte alignment.
char * top = (char*)stack + size;
context->stack_pointer = (void**)((uintptr_t)top & ~0xF);
*--context->stack_pointer = (void*)start;
/* Windows Thread Information Block */
*--context->stack_pointer = (void*)0xFFFFFFFF; /* fs:[0] */
*--context->stack_pointer = (void*)top; /* fs:[4] */
*--context->stack_pointer = (void*)stack; /* fs:[8] */
context->stack_pointer -= COROUTINE_REGISTERS;
memset(context->stack_pointer, 0, sizeof(void*) * COROUTINE_REGISTERS);
}
struct coroutine_context * __fastcall coroutine_transfer(struct coroutine_context * current, struct coroutine_context * target);
static inline void coroutine_destroy(struct coroutine_context * context)
{
}