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gcc/libgo/runtime/runtime.h
Ian Lance Taylor e20bfbd18e runtime: prevent deadlock when profiling signal arrives in stack scan 
Precise stack scan needs to unwind the stack. When it is
    unwinding the stack, if a profiling signal arrives, which also
    does a traceback, it may deadlock in dl_iterate_phdr. Prevent
    this deadlock by setting up runtime_in_callers before traceback.
    
    Reviewed-on: https://go-review.googlesource.com/c/155766

From-SVN: r267457
2018-12-29 00:07:06 +00:00

524 lines
16 KiB
C
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// Copyright 2009 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
#include "config.h"
#include "go-assert.h"
#include <complex.h>
#include <signal.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <pthread.h>
#include <semaphore.h>
#include <ucontext.h>
#ifdef HAVE_SYS_MMAN_H
#include <sys/mman.h>
#endif
#define _STRINGIFY2_(x) #x
#define _STRINGIFY_(x) _STRINGIFY2_(x)
#define GOSYM_PREFIX _STRINGIFY_(__USER_LABEL_PREFIX__)
/* This file supports C files copied from the 6g runtime library.
This is a version of the 6g runtime.h rewritten for gccgo's version
of the code. */
typedef signed int int8 __attribute__ ((mode (QI)));
typedef unsigned int uint8 __attribute__ ((mode (QI)));
typedef signed int int16 __attribute__ ((mode (HI)));
typedef unsigned int uint16 __attribute__ ((mode (HI)));
typedef signed int int32 __attribute__ ((mode (SI)));
typedef unsigned int uint32 __attribute__ ((mode (SI)));
typedef signed int int64 __attribute__ ((mode (DI)));
typedef unsigned int uint64 __attribute__ ((mode (DI)));
typedef float float32 __attribute__ ((mode (SF)));
typedef double float64 __attribute__ ((mode (DF)));
typedef signed int intptr __attribute__ ((mode (pointer)));
typedef unsigned int uintptr __attribute__ ((mode (pointer)));
typedef intptr intgo; // Go's int
typedef uintptr uintgo; // Go's uint
typedef uintptr uintreg;
/* Defined types. */
typedef _Bool bool;
typedef uint8 byte;
typedef struct g G;
typedef struct mutex Lock;
typedef struct m M;
typedef struct p P;
typedef struct note Note;
typedef struct String String;
typedef struct FuncVal FuncVal;
typedef struct SigTab SigTab;
typedef struct hchan Hchan;
typedef struct timer Timer;
typedef struct lfnode LFNode;
typedef struct cgoMal CgoMal;
typedef struct PollDesc PollDesc;
typedef struct sudog SudoG;
typedef struct schedt Sched;
typedef struct __go_open_array Slice;
typedef struct iface Iface;
typedef struct eface Eface;
typedef struct __go_type_descriptor Type;
typedef struct _defer Defer;
typedef struct _panic Panic;
typedef struct __go_ptr_type PtrType;
typedef struct __go_func_type FuncType;
typedef struct __go_interface_type InterfaceType;
typedef struct __go_map_type MapType;
typedef struct __go_channel_type ChanType;
typedef struct tracebackg Traceback;
typedef struct location Location;
struct String
{
const byte* str;
intgo len;
};
struct FuncVal
{
void (*fn)(void);
// variable-size, fn-specific data here
};
#include "array.h"
// Rename Go types generated by mkrsysinfo.sh from C types, to avoid
// the name conflict.
#define timeval go_timeval
#define timespec go_timespec
#include "runtime.inc"
#undef timeval
#undef timespec
/*
* Per-CPU declaration.
*/
extern M* runtime_m(void);
extern G* runtime_g(void)
__asm__(GOSYM_PREFIX "runtime.getg");
extern M* runtime_m0(void)
__asm__(GOSYM_PREFIX "runtime.runtime_m0");
extern G* runtime_g0(void)
__asm__(GOSYM_PREFIX "runtime.runtime_g0");
enum
{
true = 1,
false = 0,
};
enum
{
PtrSize = sizeof(void*),
};
enum
{
// Per-M stack segment cache size.
StackCacheSize = 32,
// Global <-> per-M stack segment cache transfer batch size.
StackCacheBatch = 16,
};
struct SigTab
{
int32 sig;
int32 flags;
void* fwdsig;
};
#ifdef GOOS_nacl
enum {
NaCl = 1,
};
#else
enum {
NaCl = 0,
};
#endif
#ifdef GOOS_windows
enum {
Windows = 1
};
#else
enum {
Windows = 0
};
#endif
#ifdef GOOS_solaris
enum {
Solaris = 1
};
#else
enum {
Solaris = 0
};
#endif
extern bool runtime_copystack;
/*
* defined macros
* you need super-gopher-guru privilege
* to add this list.
*/
#define nelem(x) (sizeof(x)/sizeof((x)[0]))
#define nil ((void*)0)
#define USED(v) ((void) v)
#define ROUND(x, n) (((x)+(n)-1)&~(uintptr)((n)-1)) /* all-caps to mark as macro: it evaluates n twice */
enum {
// hashinit wants this many random bytes
HashRandomBytes = 32
};
void runtime_hashinit(void);
/*
* external data
*/
extern uintptr* runtime_getZerobase(void)
__asm__(GOSYM_PREFIX "runtime.getZerobase");
extern G* runtime_getallg(intgo)
__asm__(GOSYM_PREFIX "runtime.getallg");
extern uintptr runtime_getallglen(void)
__asm__(GOSYM_PREFIX "runtime.getallglen");
extern M* runtime_getallm(void)
__asm__(GOSYM_PREFIX "runtime.getallm");
extern Sched* runtime_sched;
extern uint32 runtime_panicking(void)
__asm__ (GOSYM_PREFIX "runtime.getPanicking");
extern bool runtime_isstarted;
extern bool runtime_isarchive;
extern void panicmem(void) __asm__ (GOSYM_PREFIX "runtime.panicmem");
/*
* common functions and data
*/
#define runtime_strcmp(s1, s2) __builtin_strcmp((s1), (s2))
#define runtime_strncmp(s1, s2, n) __builtin_strncmp((s1), (s2), (n))
#define runtime_strstr(s1, s2) __builtin_strstr((s1), (s2))
intgo runtime_findnull(const byte*)
__asm__ (GOSYM_PREFIX "runtime.findnull");
void runtime_gogo(G*)
__asm__ (GOSYM_PREFIX "runtime.gogo");
struct __go_func_type;
void runtime_args(int32, byte**)
__asm__ (GOSYM_PREFIX "runtime.args");
void runtime_alginit(void)
__asm__ (GOSYM_PREFIX "runtime.alginit");
void runtime_goargs(void)
__asm__ (GOSYM_PREFIX "runtime.goargs");
void runtime_throw(const char*) __attribute__ ((noreturn));
void runtime_panicstring(const char*) __attribute__ ((noreturn));
bool runtime_canpanic(G*);
void runtime_printf(const char*, ...);
int32 runtime_snprintf(byte*, int32, const char*, ...);
#define runtime_mcmp(a, b, s) __builtin_memcmp((a), (b), (s))
#define runtime_memmove(a, b, s) __builtin_memmove((a), (b), (s))
String runtime_gostringnocopy(const byte*)
__asm__ (GOSYM_PREFIX "runtime.gostringnocopy");
void runtime_schedinit(void)
__asm__ (GOSYM_PREFIX "runtime.schedinit");
void runtime_initsig(bool)
__asm__ (GOSYM_PREFIX "runtime.initsig");
#define runtime_open(p, f, m) open((p), (f), (m))
#define runtime_read(d, v, n) read((d), (v), (n))
#define runtime_write(d, v, n) write((d), (v), (n))
#define runtime_close(d) close(d)
void runtime_ready(G*, intgo, bool)
__asm__ (GOSYM_PREFIX "runtime.ready");
String runtime_getenv(const char*);
int32 runtime_atoi(const byte*, intgo);
void* runtime_mstart(void*);
G* runtime_malg(bool, bool, byte**, uintptr*)
__asm__(GOSYM_PREFIX "runtime.malg");
void runtime_minit(void)
__asm__ (GOSYM_PREFIX "runtime.minit");
void runtime_signalstack(byte*, uintptr)
__asm__ (GOSYM_PREFIX "runtime.signalstack");
void runtime_mallocinit(void)
__asm__ (GOSYM_PREFIX "runtime.mallocinit");
void* runtime_mallocgc(uintptr, const Type*, bool)
__asm__ (GOSYM_PREFIX "runtime.mallocgc");
void* runtime_sysAlloc(uintptr, uint64*)
__asm__ (GOSYM_PREFIX "runtime.sysAlloc");
void runtime_sysFree(void*, uintptr, uint64*)
__asm__ (GOSYM_PREFIX "runtime.sysFree");
void runtime_mprofinit(void);
#define runtime_getcallersp() __builtin_frame_address(0)
void runtime_mcall(FuncVal*)
__asm__ (GOSYM_PREFIX "runtime.mcall");
int32 runtime_timediv(int64, int32, int32*)
__asm__ (GOSYM_PREFIX "runtime.timediv");
int32 runtime_round2(int32 x); // round x up to a power of 2.
// atomic operations
#define runtime_cas(pval, old, new) __sync_bool_compare_and_swap (pval, old, new)
#define runtime_cas64(pval, old, new) __sync_bool_compare_and_swap (pval, old, new)
#define runtime_casp(pval, old, new) __sync_bool_compare_and_swap (pval, old, new)
// Don't confuse with XADD x86 instruction,
// this one is actually 'addx', that is, add-and-fetch.
#define runtime_xadd(p, v) __sync_add_and_fetch (p, v)
#define runtime_xadd64(p, v) __sync_add_and_fetch (p, v)
#define runtime_xchg(p, v) __atomic_exchange_n (p, v, __ATOMIC_SEQ_CST)
#define runtime_xchg64(p, v) __atomic_exchange_n (p, v, __ATOMIC_SEQ_CST)
#define runtime_xchgp(p, v) __atomic_exchange_n (p, v, __ATOMIC_SEQ_CST)
#define runtime_atomicload(p) __atomic_load_n (p, __ATOMIC_SEQ_CST)
#define runtime_atomicstore(p, v) __atomic_store_n (p, v, __ATOMIC_SEQ_CST)
#define runtime_atomicstore64(p, v) __atomic_store_n (p, v, __ATOMIC_SEQ_CST)
#define runtime_atomicload64(p) __atomic_load_n (p, __ATOMIC_SEQ_CST)
#define runtime_atomicloadp(p) __atomic_load_n (p, __ATOMIC_SEQ_CST)
#define runtime_atomicstorep(p, v) __atomic_store_n (p, v, __ATOMIC_SEQ_CST)
void runtime_setg(G*)
__asm__ (GOSYM_PREFIX "runtime.setg");
void runtime_newextram(void)
__asm__ (GOSYM_PREFIX "runtime.newextram");
#define runtime_exit(s) exit(s)
void runtime_gosched(void)
__asm__ (GOSYM_PREFIX "runtime.Gosched");
void runtime_schedtrace(bool)
__asm__ (GOSYM_PREFIX "runtime.schedtrace");
void runtime_goparkunlock(Lock*, String, byte, intgo)
__asm__ (GOSYM_PREFIX "runtime.goparkunlock");
void runtime_tsleep(int64, const char*);
void runtime_entersyscall()
__asm__ (GOSYM_PREFIX "runtime.entersyscall");
void runtime_entersyscallblock()
__asm__ (GOSYM_PREFIX "runtime.entersyscallblock");
G* __go_go(void (*pfn)(void*), void*);
int32 runtime_callers(int32, Location*, int32, bool keep_callers);
int64 runtime_nanotime(void) // monotonic time
__asm__(GOSYM_PREFIX "runtime.nanotime");
void runtime_dopanic(int32) __attribute__ ((noreturn));
void runtime_startpanic(void)
__asm__ (GOSYM_PREFIX "runtime.startpanic");
void runtime_unwindstack(G*, byte*);
void runtime_usleep(uint32)
__asm__ (GOSYM_PREFIX "runtime.usleep");
int64 runtime_cputicks(void)
__asm__ (GOSYM_PREFIX "runtime.cputicks");
int64 runtime_tickspersecond(void)
__asm__ (GOSYM_PREFIX "runtime.tickspersecond");
void runtime_blockevent(int64, int32);
extern int64 runtime_blockprofilerate;
G* runtime_netpoll(bool)
__asm__ (GOSYM_PREFIX "runtime.netpoll");
void runtime_parsedebugvars(void)
__asm__(GOSYM_PREFIX "runtime.parsedebugvars");
void _rt0_go(void);
G* runtime_timejump(void);
/*
* mutual exclusion locks. in the uncontended case,
* as fast as spin locks (just a few user-level instructions),
* but on the contention path they sleep in the kernel.
* a zeroed Lock is unlocked (no need to initialize each lock).
*/
void runtime_lock(Lock*)
__asm__(GOSYM_PREFIX "runtime.lock");
void runtime_unlock(Lock*)
__asm__(GOSYM_PREFIX "runtime.unlock");
/*
* sleep and wakeup on one-time events.
* before any calls to notesleep or notewakeup,
* must call noteclear to initialize the Note.
* then, exactly one thread can call notesleep
* and exactly one thread can call notewakeup (once).
* once notewakeup has been called, the notesleep
* will return. future notesleep will return immediately.
* subsequent noteclear must be called only after
* previous notesleep has returned, e.g. it's disallowed
* to call noteclear straight after notewakeup.
*
* notetsleep is like notesleep but wakes up after
* a given number of nanoseconds even if the event
* has not yet happened. if a goroutine uses notetsleep to
* wake up early, it must wait to call noteclear until it
* can be sure that no other goroutine is calling
* notewakeup.
*
* notesleep/notetsleep are generally called on g0,
* notetsleepg is similar to notetsleep but is called on user g.
*/
void runtime_noteclear(Note*)
__asm__ (GOSYM_PREFIX "runtime.noteclear");
void runtime_notesleep(Note*)
__asm__ (GOSYM_PREFIX "runtime.notesleep");
void runtime_notewakeup(Note*)
__asm__ (GOSYM_PREFIX "runtime.notewakeup");
bool runtime_notetsleep(Note*, int64) // false - timeout
__asm__ (GOSYM_PREFIX "runtime.notetsleep");
bool runtime_notetsleepg(Note*, int64) // false - timeout
__asm__ (GOSYM_PREFIX "runtime.notetsleepg");
/*
* low level C-called
*/
#define runtime_mmap mmap
#define runtime_munmap munmap
#define runtime_madvise madvise
#define runtime_memclr(buf, size) __builtin_memset((buf), 0, (size))
#define runtime_getcallerpc() __builtin_return_address(0)
#ifdef __rtems__
void __wrap_rtems_task_variable_add(void **);
#endif
/*
* runtime go-called
*/
void reflect_call(const struct __go_func_type *, FuncVal *, _Bool, _Bool,
void **, void **)
__asm__ (GOSYM_PREFIX "reflect.call");
void runtime_panic(Eface)
__asm__ (GOSYM_PREFIX "runtime.gopanic");
void runtime_panic(Eface)
__attribute__ ((noreturn));
/*
* runtime c-called (but written in Go)
*/
void runtime_newErrorCString(const char*, Eface*)
__asm__ (GOSYM_PREFIX "runtime.NewErrorCString");
/*
* wrapped for go users
*/
void runtime_procyield(uint32)
__asm__(GOSYM_PREFIX "runtime.procyield");
void runtime_osyield(void)
__asm__(GOSYM_PREFIX "runtime.osyield");
uintptr runtime_memlimit(void);
#define ISNAN(f) __builtin_isnan(f)
enum
{
UseSpanType = 1,
};
#define runtime_setitimer setitimer
void runtime_check(void)
__asm__ (GOSYM_PREFIX "runtime.check");
// Size of stack space allocated using Go's allocator.
// This will be 0 when using split stacks, as in that case
// the stacks are allocated by the splitstack library.
extern uintptr runtime_stacks_sys;
/*
* ia64's register file is spilled to a separate stack, the register backing
* store, on window overflow, and must also be scanned. This occupies the other
* end of the normal stack allocation, growing upwards.
* We also need to ensure all register windows are flushed to the backing
* store, as unlike SPARC, __builtin_unwind_init doesn't do this on ia64.
*/
#ifdef __ia64__
# define secondary_stack_pointer() __builtin_ia64_bsp()
# define initial_secondary_stack_pointer(stack_alloc) (stack_alloc)
# define flush_registers_to_secondary_stack() __builtin_ia64_flushrs()
#else
# define secondary_stack_pointer() nil
# define initial_secondary_stack_pointer(stack_alloc) nil
# define flush_registers_to_secondary_stack()
#endif
struct backtrace_state;
extern struct backtrace_state *__go_get_backtrace_state(void);
extern void __go_syminfo_fnname_callback(void*, uintptr_t, const char*,
uintptr_t, uintptr_t);
extern void runtime_main(void*)
__asm__(GOSYM_PREFIX "runtime.main");
int32 getproccount(void);
#define PREFETCH(p) __builtin_prefetch(p)
bool runtime_gcwaiting(void);
void runtime_badsignal(int);
Defer* runtime_newdefer(void);
void runtime_freedefer(Defer*);
extern void _cgo_wait_runtime_init_done (void);
extern void _cgo_notify_runtime_init_done (void)
__asm__ (GOSYM_PREFIX "runtime._cgo_notify_runtime_init_done");
extern _Bool runtime_iscgo;
extern uintptr __go_end __attribute__ ((weak));
extern void *getitab(const struct __go_type_descriptor *,
const struct __go_type_descriptor *,
_Bool)
__asm__ (GOSYM_PREFIX "runtime.getitab");
extern void runtime_cpuinit(void);
extern void setRandomNumber(uint32)
__asm__ (GOSYM_PREFIX "runtime.setRandomNumber");
extern void setIsCgo(void)
__asm__ (GOSYM_PREFIX "runtime.setIsCgo");
extern void setSupportAES(bool)
__asm__ (GOSYM_PREFIX "runtime.setSupportAES");
extern void typedmemmove(const Type *, void *, const void *)
__asm__ (GOSYM_PREFIX "runtime.typedmemmove");
extern void setncpu(int32)
__asm__(GOSYM_PREFIX "runtime.setncpu");
extern Sched* runtime_getsched(void)
__asm__ (GOSYM_PREFIX "runtime.getsched");
extern void setpagesize(uintptr_t)
__asm__(GOSYM_PREFIX "runtime.setpagesize");
struct funcfileline_return
{
String retfn;
String retfile;
intgo retline;
};
struct funcfileline_return
runtime_funcfileline (uintptr targetpc, int32 index)
__asm__ (GOSYM_PREFIX "runtime.funcfileline");
/*
* helpers for stack scan.
*/
bool scanstackwithmap(void*)
__asm__(GOSYM_PREFIX "runtime.scanstackwithmap");
bool doscanstack(G*, void*)
__asm__("runtime.doscanstack");
bool runtime_usestackmaps;
bool probestackmaps(void)
__asm__("runtime.probestackmaps");
// This is set to non-zero when calling backtrace_full. This is used
// to avoid getting hanging on a recursive lock in dl_iterate_phdr on
// older versions of glibc when a SIGPROF signal arrives while
// collecting a backtrace.
extern uint32 __go_runtime_in_callers;
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