401 lines
10 KiB
C
401 lines
10 KiB
C
/* runtime.h -- runtime support for Go.
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Copyright 2009 The Go Authors. All rights reserved.
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Use of this source code is governed by a BSD-style
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license that can be found in the LICENSE file. */
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#include "config.h"
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#include "go-assert.h"
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#include <setjmp.h>
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#include <signal.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <pthread.h>
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#include <semaphore.h>
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#include <ucontext.h>
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#ifdef HAVE_SYS_MMAN_H
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#include <sys/mman.h>
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#endif
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#include "array.h"
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#include "go-alloc.h"
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#include "go-panic.h"
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#include "go-string.h"
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/* This file supports C files copied from the 6g runtime library.
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This is a version of the 6g runtime.h rewritten for gccgo's version
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of the code. */
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typedef signed int int8 __attribute__ ((mode (QI)));
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typedef unsigned int uint8 __attribute__ ((mode (QI)));
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typedef signed int int16 __attribute__ ((mode (HI)));
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typedef unsigned int uint16 __attribute__ ((mode (HI)));
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typedef signed int int32 __attribute__ ((mode (SI)));
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typedef unsigned int uint32 __attribute__ ((mode (SI)));
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typedef signed int int64 __attribute__ ((mode (DI)));
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typedef unsigned int uint64 __attribute__ ((mode (DI)));
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typedef float float32 __attribute__ ((mode (SF)));
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typedef double float64 __attribute__ ((mode (DF)));
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typedef unsigned int uintptr __attribute__ ((mode (pointer)));
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/* Defined types. */
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typedef uint8 bool;
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typedef uint8 byte;
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typedef struct G G;
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typedef union Lock Lock;
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typedef struct M M;
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typedef union Note Note;
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typedef struct SigTab SigTab;
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typedef struct MCache MCache;
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typedef struct FixAlloc FixAlloc;
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typedef struct Hchan Hchan;
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typedef struct Timers Timers;
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typedef struct Timer Timer;
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typedef struct __go_open_array Slice;
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typedef struct __go_string String;
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typedef struct __go_interface Iface;
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typedef struct __go_empty_interface Eface;
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typedef struct __go_type_descriptor Type;
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typedef struct __go_defer_stack Defer;
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typedef struct __go_panic_stack Panic;
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typedef struct __go_func_type FuncType;
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typedef struct __go_map_type MapType;
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/*
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* per-cpu declaration.
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*/
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extern M* runtime_m(void);
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extern G* runtime_g(void);
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extern M runtime_m0;
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extern G runtime_g0;
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/*
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* defined constants
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*/
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enum
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{
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// G status
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//
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// If you add to this list, add to the list
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// of "okay during garbage collection" status
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// in mgc0.c too.
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Gidle,
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Grunnable,
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Grunning,
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Gsyscall,
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Gwaiting,
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Gmoribund,
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Gdead,
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};
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enum
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{
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true = 1,
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false = 0,
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};
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/*
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* structures
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*/
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union Lock
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{
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uint32 key; // futex-based impl
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M* waitm; // linked list of waiting M's (sema-based impl)
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};
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union Note
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{
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uint32 key; // futex-based impl
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M* waitm; // waiting M (sema-based impl)
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};
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struct G
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{
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Defer* defer;
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Panic* panic;
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void* exception; // current exception being thrown
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bool is_foreign; // whether current exception from other language
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void *gcstack; // if status==Gsyscall, gcstack = stackbase to use during gc
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uintptr gcstack_size;
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void* gcnext_segment;
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void* gcnext_sp;
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void* gcinitial_sp;
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jmp_buf gcregs;
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byte* entry; // initial function
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G* alllink; // on allg
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void* param; // passed parameter on wakeup
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bool fromgogo; // reached from gogo
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int16 status;
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int32 goid;
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uint32 selgen; // valid sudog pointer
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const char* waitreason; // if status==Gwaiting
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G* schedlink;
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bool readyonstop;
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bool ispanic;
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M* m; // for debuggers, but offset not hard-coded
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M* lockedm;
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M* idlem;
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// int32 sig;
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// uintptr sigcode0;
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// uintptr sigcode1;
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// uintptr sigpc;
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uintptr gopc; // pc of go statement that created this goroutine
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ucontext_t context;
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void* stack_context[10];
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};
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struct M
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{
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G* g0; // goroutine with scheduling stack
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G* gsignal; // signal-handling G
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G* curg; // current running goroutine
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int32 id;
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int32 mallocing;
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int32 gcing;
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int32 locks;
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int32 nomemprof;
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int32 waitnextg;
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int32 dying;
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int32 profilehz;
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int32 helpgc;
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uint32 fastrand;
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Note havenextg;
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G* nextg;
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M* alllink; // on allm
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M* schedlink;
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MCache *mcache;
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G* lockedg;
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G* idleg;
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M* nextwaitm; // next M waiting for lock
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uintptr waitsema; // semaphore for parking on locks
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uint32 waitsemacount;
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uint32 waitsemalock;
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};
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struct SigTab
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{
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int32 sig;
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int32 flags;
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};
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enum
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{
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SigCatch = 1<<0,
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SigIgnore = 1<<1,
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SigRestart = 1<<2,
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SigQueue = 1<<3,
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SigPanic = 1<<4,
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};
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/* Macros. */
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#ifdef GOOS_windows
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enum {
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Windows = 1
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};
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#else
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enum {
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Windows = 0
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};
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#endif
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struct Timers
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{
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Lock;
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G *timerproc;
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bool sleeping;
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bool rescheduling;
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Note waitnote;
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Timer **t;
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int32 len;
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int32 cap;
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};
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// Package time knows the layout of this structure.
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// If this struct changes, adjust ../time/sleep.go:/runtimeTimer.
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struct Timer
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{
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int32 i; // heap index
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// Timer wakes up at when, and then at when+period, ... (period > 0 only)
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// each time calling f(now, arg) in the timer goroutine, so f must be
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// a well-behaved function and not block.
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int64 when;
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int64 period;
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void (*f)(int64, Eface);
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Eface arg;
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};
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/*
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* defined macros
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* you need super-gopher-guru privilege
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* to add this list.
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*/
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#define nelem(x) (sizeof(x)/sizeof((x)[0]))
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#define nil ((void*)0)
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#define USED(v) ((void) v)
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/*
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* external data
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*/
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G* runtime_allg;
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G* runtime_lastg;
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M* runtime_allm;
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extern int32 runtime_gomaxprocs;
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extern bool runtime_singleproc;
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extern uint32 runtime_panicking;
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extern int32 runtime_gcwaiting; // gc is waiting to run
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int32 runtime_ncpu;
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/*
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* common functions and data
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*/
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int32 runtime_findnull(const byte*);
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/*
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* very low level c-called
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*/
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void runtime_args(int32, byte**);
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void runtime_osinit();
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void runtime_goargs(void);
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void runtime_goenvs(void);
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void runtime_throw(const char*) __attribute__ ((noreturn));
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void runtime_panicstring(const char*) __attribute__ ((noreturn));
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void* runtime_mal(uintptr);
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void runtime_schedinit(void);
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void runtime_initsig(int32);
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String runtime_gostringnocopy(const byte*);
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void* runtime_mstart(void*);
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G* runtime_malg(int32, byte**, size_t*);
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void runtime_minit(void);
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void runtime_mallocinit(void);
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void runtime_gosched(void);
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void runtime_tsleep(int64);
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M* runtime_newm(void);
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void runtime_goexit(void);
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void runtime_entersyscall(void) __asm__("libgo_syscall.syscall.entersyscall");
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void runtime_exitsyscall(void) __asm__("libgo_syscall.syscall.exitsyscall");
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void siginit(void);
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bool __go_sigsend(int32 sig);
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int64 runtime_nanotime(void);
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void runtime_stoptheworld(void);
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void runtime_starttheworld(bool);
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G* __go_go(void (*pfn)(void*), void*);
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/*
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* mutual exclusion locks. in the uncontended case,
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* as fast as spin locks (just a few user-level instructions),
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* but on the contention path they sleep in the kernel.
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* a zeroed Lock is unlocked (no need to initialize each lock).
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*/
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void runtime_lock(Lock*);
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void runtime_unlock(Lock*);
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/*
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* sleep and wakeup on one-time events.
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* before any calls to notesleep or notewakeup,
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* must call noteclear to initialize the Note.
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* then, exactly one thread can call notesleep
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* and exactly one thread can call notewakeup (once).
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* once notewakeup has been called, the notesleep
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* will return. future notesleep will return immediately.
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* subsequent noteclear must be called only after
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* previous notesleep has returned, e.g. it's disallowed
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* to call noteclear straight after notewakeup.
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*
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* notetsleep is like notesleep but wakes up after
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* a given number of nanoseconds even if the event
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* has not yet happened. if a goroutine uses notetsleep to
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* wake up early, it must wait to call noteclear until it
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* can be sure that no other goroutine is calling
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* notewakeup.
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*/
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void runtime_noteclear(Note*);
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void runtime_notesleep(Note*);
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void runtime_notewakeup(Note*);
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void runtime_notetsleep(Note*, int64);
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/*
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* low-level synchronization for implementing the above
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*/
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uintptr runtime_semacreate(void);
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int32 runtime_semasleep(int64);
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void runtime_semawakeup(M*);
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// or
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void runtime_futexsleep(uint32*, uint32, int64);
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void runtime_futexwakeup(uint32*, uint32);
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/*
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* runtime go-called
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*/
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void runtime_panic(Eface);
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/* Functions. */
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#define runtime_panic __go_panic
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#define runtime_printf printf
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#define runtime_malloc(s) __go_alloc(s)
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#define runtime_free(p) __go_free(p)
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#define runtime_strcmp(s1, s2) __builtin_strcmp((s1), (s2))
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#define runtime_mcmp(a, b, s) __builtin_memcmp((a), (b), (s))
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#define runtime_memmove(a, b, s) __builtin_memmove((a), (b), (s))
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#define runtime_exit(s) _exit(s)
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MCache* runtime_allocmcache(void);
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void free(void *v);
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struct __go_func_type;
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bool runtime_addfinalizer(void*, void(*fn)(void*), const struct __go_func_type *);
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#define runtime_cas(pval, old, new) __sync_bool_compare_and_swap (pval, old, new)
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#define runtime_casp(pval, old, new) __sync_bool_compare_and_swap (pval, old, new)
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#define runtime_xadd(p, v) __sync_add_and_fetch (p, v)
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#define runtime_xchg(p, v) __atomic_exchange_n (p, v, __ATOMIC_SEQ_CST)
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#define runtime_atomicload(p) __atomic_load_n (p, __ATOMIC_SEQ_CST)
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#define runtime_atomicstore(p, v) __atomic_store_n (p, v, __ATOMIC_SEQ_CST)
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#define runtime_atomicloadp(p) __atomic_load_n (p, __ATOMIC_SEQ_CST)
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#define runtime_atomicstorep(p, v) __atomic_store_n (p, v, __ATOMIC_SEQ_CST)
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void runtime_dopanic(int32) __attribute__ ((noreturn));
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void runtime_startpanic(void);
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void runtime_ready(G*);
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const byte* runtime_getenv(const char*);
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int32 runtime_atoi(const byte*);
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uint32 runtime_fastrand1(void);
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void runtime_sigprof(uint8 *pc, uint8 *sp, uint8 *lr, G *gp);
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void runtime_resetcpuprofiler(int32);
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void runtime_setcpuprofilerate(void(*)(uintptr*, int32), int32);
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void runtime_usleep(uint32);
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void runtime_semacquire(uint32 volatile *);
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void runtime_semrelease(uint32 volatile *);
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int32 runtime_gomaxprocsfunc(int32 n);
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void runtime_procyield(uint32);
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void runtime_osyield(void);
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void runtime_LockOSThread(void) __asm__("libgo_runtime.runtime.LockOSThread");
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void runtime_UnlockOSThread(void) __asm__("libgo_runtime.runtime.UnlockOSThread");
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/*
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* low level C-called
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*/
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#define runtime_mmap mmap
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#define runtime_munmap munmap
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#define runtime_madvise madvise
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#define runtime_memclr(buf, size) __builtin_memset((buf), 0, (size))
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struct __go_func_type;
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void reflect_call(const struct __go_func_type *, const void *, _Bool, _Bool,
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void **, void **)
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asm ("libgo_reflect.reflect.call");
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#ifdef __rtems__
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void __wrap_rtems_task_variable_add(void **);
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#endif
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void runtime_time_scan(void (*)(byte*, int64));
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