Initial checkin of GCC 4.9.0 from trunk (r208799).

Change-Id: I48a3c08bb98542aa215912a75f03c0890e497dba

1 files changed, 789 insertions, 0 deletions

diff --git a/gcc-4.9/libgo/runtime/runtime.h b/gcc-4.9/libgo/runtime/runtime.h
new file mode 100644
index 000000000..da2416335
--- /dev/null
+++ b/gcc-4.9/libgo/runtime/runtime.h
@@ -0,0 +1,789 @@
+// 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 <signal.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
+
+#include "interface.h"
+#include "go-alloc.h"
+
+#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
+
+/* Defined types.  */
+
+typedef	uint8			bool;
+typedef	uint8			byte;
+typedef	struct	Func		Func;
+typedef	struct	G		G;
+typedef	struct	Lock		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	MCache		MCache;
+typedef struct	FixAlloc	FixAlloc;
+typedef	struct	Hchan		Hchan;
+typedef	struct	Timers		Timers;
+typedef	struct	Timer		Timer;
+typedef	struct	GCStats		GCStats;
+typedef	struct	LFNode		LFNode;
+typedef	struct	ParFor		ParFor;
+typedef	struct	ParForThread	ParForThread;
+typedef	struct	CgoMal		CgoMal;
+typedef	struct	PollDesc	PollDesc;
+typedef	struct	DebugVars	DebugVars;
+
+typedef	struct	__go_open_array		Slice;
+typedef struct	__go_interface		Iface;
+typedef	struct	__go_empty_interface	Eface;
+typedef	struct	__go_type_descriptor	Type;
+typedef	struct	__go_defer_stack	Defer;
+typedef	struct	__go_panic_stack	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  Traceback	Traceback;
+
+typedef struct	Location	Location;
+
+/*
+ * Per-CPU declaration.
+ */
+extern M*	runtime_m(void);
+extern G*	runtime_g(void);
+
+extern M	runtime_m0;
+extern G	runtime_g0;
+
+/*
+ * defined constants
+ */
+enum
+{
+	// G status
+	//
+	// If you add to this list, add to the list
+	// of "okay during garbage collection" status
+	// in mgc0.c too.
+	Gidle,
+	Grunnable,
+	Grunning,
+	Gsyscall,
+	Gwaiting,
+	Gmoribund_unused,  // currently unused, but hardcoded in gdb scripts
+	Gdead,
+};
+enum
+{
+	// P status
+	Pidle,
+	Prunning,
+	Psyscall,
+	Pgcstop,
+	Pdead,
+};
+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,
+};
+/*
+ * structures
+ */
+struct	Lock
+{
+	// Futex-based impl treats it as uint32 key,
+	// while sema-based impl as M* waitm.
+	// Used to be a union, but unions break precise GC.
+	uintptr	key;
+};
+struct	Note
+{
+	// Futex-based impl treats it as uint32 key,
+	// while sema-based impl as M* waitm.
+	// Used to be a union, but unions break precise GC.
+	uintptr	key;
+};
+struct String
+{
+	const byte*	str;
+	intgo		len;
+};
+struct FuncVal
+{
+	void	(*fn)(void);
+	// variable-size, fn-specific data here
+};
+struct	GCStats
+{
+	// the struct must consist of only uint64's,
+	// because it is casted to uint64[].
+	uint64	nhandoff;
+	uint64	nhandoffcnt;
+	uint64	nprocyield;
+	uint64	nosyield;
+	uint64	nsleep;
+};
+
+// A location in the program, used for backtraces.
+struct	Location
+{
+	uintptr	pc;
+	String	filename;
+	String	function;
+	intgo	lineno;
+};
+
+struct	G
+{
+	void*	closure;	// Closure value.
+	Defer*	defer;
+	Panic*	panic;
+	void*	exception;	// current exception being thrown
+	bool	is_foreign;	// whether current exception from other language
+	void	*gcstack;	// if status==Gsyscall, gcstack = stackbase to use during gc
+	uintptr	gcstack_size;
+	void*	gcnext_segment;
+	void*	gcnext_sp;
+	void*	gcinitial_sp;
+	ucontext_t gcregs;
+	byte*	entry;		// initial function
+	G*	alllink;	// on allg
+	void*	param;		// passed parameter on wakeup
+	bool	fromgogo;	// reached from gogo
+	int16	status;
+	uint32	selgen;		// valid sudog pointer
+	int64	goid;
+	const char*	waitreason;	// if status==Gwaiting
+	G*	schedlink;
+	bool	ispanic;
+	bool	issystem;	// do not output in stack dump
+	bool	isbackground;	// ignore in deadlock detector
+	M*	m;		// for debuggers, but offset not hard-coded
+	M*	lockedm;
+	int32	sig;
+	int32	writenbuf;
+	byte*	writebuf;
+	// DeferChunk*	dchunk;
+	// DeferChunk*	dchunknext;
+	uintptr	sigcode0;
+	uintptr	sigcode1;
+	// uintptr	sigpc;
+	uintptr	gopc;	// pc of go statement that created this goroutine
+
+	int32	ncgo;
+	CgoMal*	cgomal;
+
+	Traceback* traceback;
+
+	ucontext_t	context;
+	void*		stack_context[10];
+};
+
+struct	M
+{
+	G*	g0;		// goroutine with scheduling stack
+	G*	gsignal;	// signal-handling G
+	byte*	gsignalstack;
+	size_t	gsignalstacksize;
+	void	(*mstartfn)(void);
+	G*	curg;		// current running goroutine
+	G*	caughtsig;	// goroutine running during fatal signal
+	P*	p;		// attached P for executing Go code (nil if not executing Go code)
+	P*	nextp;
+	int32	id;
+	int32	mallocing;
+	int32	throwing;
+	int32	gcing;
+	int32	locks;
+	int32	dying;
+	int32	profilehz;
+	int32	helpgc;
+	bool	spinning;
+	uint32	fastrand;
+	uint64	ncgocall;	// number of cgo calls in total
+	int32	ncgo;		// number of cgo calls currently in progress
+	CgoMal*	cgomal;
+	Note	park;
+	M*	alllink;	// on allm
+	M*	schedlink;
+	MCache	*mcache;
+	G*	lockedg;
+	Location createstack[32];	// Stack that created this thread.
+	uint32	locked;	// tracking for LockOSThread
+	M*	nextwaitm;	// next M waiting for lock
+	uintptr	waitsema;	// semaphore for parking on locks
+	uint32	waitsemacount;
+	uint32	waitsemalock;
+	GCStats	gcstats;
+	bool	racecall;
+	bool	needextram;
+	bool	dropextram;	// for gccgo: drop after call is done.
+	void*	racepc;
+	void	(*waitunlockf)(Lock*);
+	void*	waitlock;
+
+	uintptr	settype_buf[1024];
+	uintptr	settype_bufsize;
+
+	uintptr	end[];
+};
+
+struct P
+{
+	Lock;
+
+	int32	id;
+	uint32	status;		// one of Pidle/Prunning/...
+	P*	link;
+	uint32	schedtick;	// incremented on every scheduler call
+	uint32	syscalltick;	// incremented on every system call
+	M*	m;		// back-link to associated M (nil if idle)
+	MCache*	mcache;
+
+	// Queue of runnable goroutines.
+	G**	runq;
+	int32	runqhead;
+	int32	runqtail;
+	int32	runqsize;
+
+	// Available G's (status == Gdead)
+	G*	gfree;
+	int32	gfreecnt;
+
+	byte	pad[64];
+};
+
+// The m->locked word holds two pieces of state counting active calls to LockOSThread/lockOSThread.
+// The low bit (LockExternal) is a boolean reporting whether any LockOSThread call is active.
+// External locks are not recursive; a second lock is silently ignored.
+// The upper bits of m->lockedcount record the nesting depth of calls to lockOSThread
+// (counting up by LockInternal), popped by unlockOSThread (counting down by LockInternal).
+// Internal locks can be recursive. For instance, a lock for cgo can occur while the main
+// goroutine is holding the lock during the initialization phase.
+enum
+{
+	LockExternal = 1,
+	LockInternal = 2,
+};
+
+struct	SigTab
+{
+	int32	sig;
+	int32	flags;
+};
+enum
+{
+	SigNotify = 1<<0,	// let signal.Notify have signal, even if from kernel
+	SigKill = 1<<1,		// if signal.Notify doesn't take it, exit quietly
+	SigThrow = 1<<2,	// if signal.Notify doesn't take it, exit loudly
+	SigPanic = 1<<3,	// if the signal is from the kernel, panic
+	SigDefault = 1<<4,	// if the signal isn't explicitly requested, don't monitor it
+	SigHandling = 1<<5,	// our signal handler is registered
+	SigIgnored = 1<<6,	// the signal was ignored before we registered for it
+};
+
+// Layout of in-memory per-function information prepared by linker
+// See http://golang.org/s/go12symtab.
+// Keep in sync with linker and with ../../libmach/sym.c
+// and with package debug/gosym.
+struct	Func
+{
+	String	name;
+	uintptr	entry;	// entry pc
+};
+
+#ifdef GOOS_windows
+enum {
+   Windows = 1
+};
+#else
+enum {
+   Windows = 0
+};
+#endif
+
+struct	Timers
+{
+	Lock;
+	G	*timerproc;
+	bool		sleeping;
+	bool		rescheduling;
+	Note	waitnote;
+	Timer	**t;
+	int32	len;
+	int32	cap;
+};
+
+// Package time knows the layout of this structure.
+// If this struct changes, adjust ../time/sleep.go:/runtimeTimer.
+struct	Timer
+{
+	int32	i;	// heap index
+
+	// Timer wakes up at when, and then at when+period, ... (period > 0 only)
+	// each time calling f(now, arg) in the timer goroutine, so f must be
+	// a well-behaved function and not block.
+	int64	when;
+	int64	period;
+	FuncVal	*fv;
+	Eface	arg;
+};
+
+// Lock-free stack node.
+struct LFNode
+{
+	LFNode	*next;
+	uintptr	pushcnt;
+};
+
+// Parallel for descriptor.
+struct ParFor
+{
+	void (*body)(ParFor*, uint32);	// executed for each element
+	uint32 done;			// number of idle threads
+	uint32 nthr;			// total number of threads
+	uint32 nthrmax;			// maximum number of threads
+	uint32 thrseq;			// thread id sequencer
+	uint32 cnt;			// iteration space [0, cnt)
+	void *ctx;			// arbitrary user context
+	bool wait;			// if true, wait while all threads finish processing,
+					// otherwise parfor may return while other threads are still working
+	ParForThread *thr;		// array of thread descriptors
+	uint32 pad;			// to align ParForThread.pos for 64-bit atomic operations
+	// stats
+	uint64 nsteal;
+	uint64 nstealcnt;
+	uint64 nprocyield;
+	uint64 nosyield;
+	uint64 nsleep;
+};
+
+// Track memory allocated by code not written in Go during a cgo call,
+// so that the garbage collector can see them.
+struct CgoMal
+{
+	CgoMal	*next;
+	void	*alloc;
+};
+
+// Holds variables parsed from GODEBUG env var.
+struct DebugVars
+{
+	int32	gctrace;
+	int32	schedtrace;
+	int32	scheddetail;
+};
+
+extern bool runtime_precisestack;
+
+/*
+ * 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)&~((n)-1)) /* all-caps to mark as macro: it evaluates n twice */
+
+byte*	runtime_startup_random_data;
+uint32	runtime_startup_random_data_len;
+void	runtime_get_random_data(byte**, int32*);
+
+enum {
+	// hashinit wants this many random bytes
+	HashRandomBytes = 32
+};
+void	runtime_hashinit(void);
+
+void	runtime_traceback(void);
+void	runtime_tracebackothers(G*);
+
+/*
+ * external data
+ */
+extern	uintptr runtime_zerobase;
+extern	G*	runtime_allg;
+extern	G*	runtime_lastg;
+extern	M*	runtime_allm;
+extern	P**	runtime_allp;
+extern	int32	runtime_gomaxprocs;
+extern	uint32	runtime_needextram;
+extern	uint32	runtime_panicking;
+extern	int8*	runtime_goos;
+extern	int32	runtime_ncpu;
+extern 	void	(*runtime_sysargs)(int32, uint8**);
+extern	DebugVars	runtime_debug;
+
+/*
+ * common functions and data
+ */
+#define runtime_strcmp(s1, s2) __builtin_strcmp((s1), (s2))
+#define runtime_strstr(s1, s2) __builtin_strstr((s1), (s2))
+intgo	runtime_findnull(const byte*);
+intgo	runtime_findnullw(const uint16*);
+void	runtime_dump(byte*, int32);
+
+/*
+ * very low level c-called
+ */
+void	runtime_gogo(G*);
+struct __go_func_type;
+void	runtime_args(int32, byte**);
+void	runtime_osinit();
+void	runtime_goargs(void);
+void	runtime_goenvs(void);
+void	runtime_goenvs_unix(void);
+void	runtime_throw(const char*) __attribute__ ((noreturn));
+void	runtime_panicstring(const char*) __attribute__ ((noreturn));
+void	runtime_prints(const char*);
+void	runtime_printf(const char*, ...);
+#define runtime_mcmp(a, b, s) __builtin_memcmp((a), (b), (s))
+#define runtime_memmove(a, b, s) __builtin_memmove((a), (b), (s))
+void*	runtime_mal(uintptr);
+String	runtime_gostring(const byte*);
+String	runtime_gostringnocopy(const byte*);
+void	runtime_schedinit(void);
+void	runtime_initsig(void);
+void	runtime_sigenable(uint32 sig);
+void	runtime_sigdisable(uint32 sig);
+int32	runtime_gotraceback(bool *crash);
+void	runtime_goroutineheader(G*);
+void	runtime_printtrace(Location*, int32, bool);
+#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)
+#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_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_ready(G*);
+const byte*	runtime_getenv(const char*);
+int32	runtime_atoi(const byte*);
+void*	runtime_mstart(void*);
+G*	runtime_malg(int32, byte**, size_t*);
+void	runtime_mpreinit(M*);
+void	runtime_minit(void);
+void	runtime_unminit(void);
+void	runtime_needm(void);
+void	runtime_dropm(void);
+void	runtime_signalstack(byte*, int32);
+MCache*	runtime_allocmcache(void);
+void	runtime_freemcache(MCache*);
+void	runtime_mallocinit(void);
+void	runtime_mprofinit(void);
+#define runtime_malloc(s) __go_alloc(s)
+#define runtime_free(p) __go_free(p)
+bool	runtime_addfinalizer(void*, FuncVal *fn, const struct __go_func_type *, const struct __go_ptr_type *);
+#define runtime_getcallersp(p) __builtin_frame_address(1)
+int32	runtime_mcount(void);
+int32	runtime_gcount(void);
+void	runtime_mcall(void(*)(G*));
+uint32	runtime_fastrand1(void);
+int32	runtime_timediv(int64, int32, int32*);
+
+void runtime_setmg(M*, G*);
+void runtime_newextram(void);
+#define runtime_exit(s) exit(s)
+#define runtime_breakpoint() __builtin_trap()
+void	runtime_gosched(void);
+void	runtime_gosched0(G*);
+void	runtime_schedtrace(bool);
+void	runtime_park(void(*)(Lock*), Lock*, const char*);
+void	runtime_tsleep(int64, const char*);
+M*	runtime_newm(void);
+void	runtime_goexit(void);
+void	runtime_entersyscall(void) __asm__ (GOSYM_PREFIX "syscall.Entersyscall");
+void	runtime_entersyscallblock(void);
+void	runtime_exitsyscall(void) __asm__ (GOSYM_PREFIX "syscall.Exitsyscall");
+G*	__go_go(void (*pfn)(void*), void*);
+void	siginit(void);
+bool	__go_sigsend(int32 sig);
+int32	runtime_callers(int32, Location*, int32);
+int64	runtime_nanotime(void);
+void	runtime_dopanic(int32) __attribute__ ((noreturn));
+void	runtime_startpanic(void);
+void	runtime_freezetheworld(void);
+void	runtime_unwindstack(G*, byte*);
+void	runtime_sigprof();
+void	runtime_resetcpuprofiler(int32);
+void	runtime_setcpuprofilerate(void(*)(uintptr*, int32), int32);
+void	runtime_usleep(uint32);
+int64	runtime_cputicks(void);
+int64	runtime_tickspersecond(void);
+void	runtime_blockevent(int64, int32);
+extern int64 runtime_blockprofilerate;
+void	runtime_addtimer(Timer*);
+bool	runtime_deltimer(Timer*);
+G*	runtime_netpoll(bool);
+void	runtime_netpollinit(void);
+int32	runtime_netpollopen(uintptr, PollDesc*);
+int32   runtime_netpollclose(uintptr);
+void	runtime_netpollready(G**, PollDesc*, int32);
+uintptr	runtime_netpollfd(PollDesc*);
+void	runtime_crash(void);
+void	runtime_parsedebugvars(void);
+void	_rt0_go(void);
+void*	runtime_funcdata(Func*, int32);
+
+void	runtime_stoptheworld(void);
+void	runtime_starttheworld(void);
+extern uint32 runtime_worldsema;
+
+/*
+ * 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*);
+void	runtime_unlock(Lock*);
+
+/*
+ * 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*);
+void	runtime_notesleep(Note*);
+void	runtime_notewakeup(Note*);
+bool	runtime_notetsleep(Note*, int64);  // false - timeout
+bool	runtime_notetsleepg(Note*, int64);  // false - timeout
+
+/*
+ * low-level synchronization for implementing the above
+ */
+uintptr	runtime_semacreate(void);
+int32	runtime_semasleep(int64);
+void	runtime_semawakeup(M*);
+// or
+void	runtime_futexsleep(uint32*, uint32, int64);
+void	runtime_futexwakeup(uint32*, uint32);
+
+/*
+ * Lock-free stack.
+ * Initialize uint64 head to 0, compare with 0 to test for emptiness.
+ * The stack does not keep pointers to nodes,
+ * so they can be garbage collected if there are no other pointers to nodes.
+ */
+void	runtime_lfstackpush(uint64 *head, LFNode *node)
+  __asm__ (GOSYM_PREFIX "runtime.lfstackpush");
+LFNode*	runtime_lfstackpop(uint64 *head);
+
+/*
+ * Parallel for over [0, n).
+ * body() is executed for each iteration.
+ * nthr - total number of worker threads.
+ * ctx - arbitrary user context.
+ * if wait=true, threads return from parfor() when all work is done;
+ * otherwise, threads can return while other threads are still finishing processing.
+ */
+ParFor*	runtime_parforalloc(uint32 nthrmax);
+void	runtime_parforsetup(ParFor *desc, uint32 nthr, uint32 n, void *ctx, bool wait, void (*body)(ParFor*, uint32));
+void	runtime_parfordo(ParFor *desc) __asm__ (GOSYM_PREFIX "runtime.parfordo");
+
+/*
+ * 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(p) __builtin_return_address(0)
+
+#ifdef __rtems__
+void __wrap_rtems_task_variable_add(void **);
+#endif
+
+/*
+ * Names generated by gccgo.
+ */
+#define runtime_printbool	__go_print_bool
+#define runtime_printfloat	__go_print_double
+#define runtime_printint	__go_print_int64
+#define runtime_printiface	__go_print_interface
+#define runtime_printeface	__go_print_empty_interface
+#define runtime_printstring	__go_print_string
+#define runtime_printpointer	__go_print_pointer
+#define runtime_printuint	__go_print_uint64
+#define runtime_printslice	__go_print_slice
+#define runtime_printcomplex	__go_print_complex
+
+/*
+ * runtime go-called
+ */
+void	runtime_printbool(_Bool);
+void	runtime_printbyte(int8);
+void	runtime_printfloat(double);
+void	runtime_printint(int64);
+void	runtime_printiface(Iface);
+void	runtime_printeface(Eface);
+void	runtime_printstring(String);
+void	runtime_printpc(void*);
+void	runtime_printpointer(void*);
+void	runtime_printuint(uint64);
+void	runtime_printhex(uint64);
+void	runtime_printslice(Slice);
+void	runtime_printcomplex(__complex double);
+void reflect_call(const struct __go_func_type *, FuncVal *, _Bool, _Bool,
+		  void **, void **)
+  __asm__ (GOSYM_PREFIX "reflect.call");
+#define runtime_panic __go_panic
+
+/*
+ * runtime c-called (but written in Go)
+ */
+void	runtime_printany(Eface)
+     __asm__ (GOSYM_PREFIX "runtime.Printany");
+void	runtime_newTypeAssertionError(const String*, const String*, const String*, const String*, Eface*)
+     __asm__ (GOSYM_PREFIX "runtime.NewTypeAssertionError");
+void	runtime_newErrorString(String, Eface*)
+     __asm__ (GOSYM_PREFIX "runtime.NewErrorString");
+void	runtime_newErrorCString(const char*, Eface*)
+     __asm__ (GOSYM_PREFIX "runtime.NewErrorCString");
+
+/*
+ * wrapped for go users
+ */
+void	runtime_semacquire(uint32 volatile *, bool);
+void	runtime_semrelease(uint32 volatile *);
+int32	runtime_gomaxprocsfunc(int32 n);
+void	runtime_procyield(uint32);
+void	runtime_osyield(void);
+void	runtime_lockOSThread(void);
+void	runtime_unlockOSThread(void);
+
+bool	runtime_showframe(String, bool);
+void	runtime_printcreatedby(G*);
+
+uintptr	runtime_memlimit(void);
+
+#define ISNAN(f) __builtin_isnan(f)
+
+enum
+{
+	UseSpanType = 0,
+};
+
+#define runtime_setitimer setitimer
+
+void	runtime_check(void);
+
+// A list of global variables that the garbage collector must scan.
+struct root_list {
+	struct root_list *next;
+	struct root {
+		void *decl;
+		size_t size;
+	} roots[];
+};
+
+void	__go_register_gc_roots(struct root_list*);
+
+// 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;
+
+struct backtrace_state;
+extern struct backtrace_state *__go_get_backtrace_state(void);
+extern _Bool __go_file_line(uintptr, String*, String*, intgo *);
+extern byte* runtime_progname();
+extern void runtime_main(void*);
+extern uint32 runtime_in_callers;
+
+int32 getproccount(void);
+
+#define PREFETCH(p) __builtin_prefetch(p)
+
+void	__go_set_closure(void*);
+void*	__go_get_closure(void);
+
+bool	runtime_gcwaiting(void);
+void	runtime_badsignal(int);