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ruby--ruby/coroutine/arm32/Context.h

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/*
* 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 __attribute__((noreturn)) void
#define COROUTINE_LIMITED_ADDRESS_SPACE
enum {COROUTINE_REGISTERS = 8};
struct coroutine_context
{
void **stack_pointer;
};
typedef COROUTINE(* 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;
context->stack_pointer -= COROUTINE_REGISTERS;
memset(context->stack_pointer, 0, sizeof(void*) * COROUTINE_REGISTERS);
}
struct coroutine_context * coroutine_transfer(struct coroutine_context * current, struct coroutine_context * target);
static inline void coroutine_destroy(struct coroutine_context * context)
{
}