Ruby: coroutine/amd64/Context.h Source File

Ruby 3.0.5p211 (2022-11-24 revision ba5cf0f7c52d4d35cc6a173c89eda98ceffa2dcf)

Context.h
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1/*
2 * This file is part of the "Coroutine" project and released under the MIT License.
3 *
4 * Created by Samuel Williams on 10/5/2018.
5 * Copyright, 2018, by Samuel Williams.
6*/
7
8#pragma once
9
10#include <assert.h>
11#include <stddef.h>
12#include <stdint.h>
13#include <string.h>
14
15#define COROUTINE __attribute__((noreturn)) void
16
17 enum {COROUTINE_REGISTERS = 6};
18
19 struct coroutine_context
20{
21 void **stack_pointer;
22};
23
24 typedef COROUTINE(* coroutine_start)(struct coroutine_context *from, struct coroutine_context *self);
25
26static inline void coroutine_initialize_main(struct coroutine_context * context) {
27 context->stack_pointer = NULL;
28}
29
30static inline void coroutine_initialize(
31 struct coroutine_context *context,
32 coroutine_start start,
33 void *stack,
34 size_t size
35) {
36 assert(start && stack && size >= 1024);
37
38 // Stack grows down. Force 16-byte alignment.
39 char * top = (char*)stack + size;
40 context->stack_pointer = (void**)((uintptr_t)top & ~0xF);
41
42 *--context->stack_pointer = NULL;
43 *--context->stack_pointer = (void*)start;
44
45 context->stack_pointer -= COROUTINE_REGISTERS;
46 memset(context->stack_pointer, 0, sizeof(void*) * COROUTINE_REGISTERS);
47}
48
49struct coroutine_context * coroutine_transfer(struct coroutine_context * current, struct coroutine_context * target);
50
51static inline void coroutine_destroy(struct coroutine_context * context)
52{
53 context->stack_pointer = NULL;
54}
coroutine_start
COROUTINE(* coroutine_start)(struct coroutine_context *from, struct coroutine_context *self)
Definition: Context.h:24
COROUTINE
#define COROUTINE
Definition: Context.h:15
coroutine_transfer
struct coroutine_context * coroutine_transfer(struct coroutine_context *current, struct coroutine_context *target)
Definition: Context.c:136
COROUTINE_REGISTERS
@ COROUTINE_REGISTERS
Definition: Context.h:17
assert.h
assert
#define assert(x)
Definition: dlmalloc.c:1176
size
voidpf void uLong size
Definition: ioapi.h:138
top
unsigned int top
Definition: nkf.c:4323
NULL
#define NULL
Definition: regenc.h:69
coroutine_context
Definition: Context.h:20
coroutine_context::from
struct coroutine_context * from
Definition: Context.h:41
coroutine_context::stack_pointer
void ** stack_pointer
Definition: Context.h:21
coroutine_context::stack
void * stack
Definition: Context.h:33
uintptr_t
unsigned int uintptr_t
Definition: win32.h:106