Ruby: coroutine/x86/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 3/11/2018.
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, fastcall)) void
16#define COROUTINE_LIMITED_ADDRESS_SPACE
17
18 enum {COROUTINE_REGISTERS = 4};
19
20struct coroutine_context
21{
22 void **stack_pointer;
23};
24
25 typedef COROUTINE(* coroutine_start)(struct coroutine_context *from, struct coroutine_context *self) __attribute__((fastcall));
26
27static inline void coroutine_initialize_main(struct coroutine_context * context) {
28 context->stack_pointer = NULL;
29}
30
31static inline void coroutine_initialize(
32 struct coroutine_context *context,
33 coroutine_start start,
34 void *stack,
35 size_t size
36) {
37 assert(start && stack && size >= 1024);
38
39 // Stack grows down. Force 16-byte alignment.
40 char * top = (char*)stack + size;
41 context->stack_pointer = (void**)((uintptr_t)top & ~0xF);
42
43 *--context->stack_pointer = NULL;
44 *--context->stack_pointer = (void*)start;
45
46 context->stack_pointer -= COROUTINE_REGISTERS;
47 memset(context->stack_pointer, 0, sizeof(void*) * COROUTINE_REGISTERS);
48}
49
50struct coroutine_context * coroutine_transfer(struct coroutine_context * current, struct coroutine_context * target) __attribute__((fastcall));
51
52static inline void coroutine_destroy(struct coroutine_context * context)
53{
54 context->stack_pointer = NULL;
55}
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
__attribute__
void *PTR64 __attribute__((mode(DI)))
Definition: ffi.c:41
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