runtime: trivial replacements of _g_ in remaining files

Change-Id: I24d299b345bda1c9d6fa7876d4f03c05b8c1156d
Reviewed-on: https://go-review.googlesource.com/c/go/+/418587
TryBot-Result: Gopher Robot <gobot@golang.org>
Run-TryBot: Michael Pratt <mpratt@google.com>
Reviewed-by: Austin Clements <austin@google.com>

src/runtime/panic.go

@@ -1190,7 +1190,7 @@ func fatalpanic(msgs *_panic) {
 //
 //go:nowritebarrierrec
 func startpanic_m() bool {
-	_g_ := getg()
+	gp := getg()
 	if mheap_.cachealloc.size == 0 { // very early
 		print("runtime: panic before malloc heap initialized\n")
 	}
@@ -1198,18 +1198,18 @@ func startpanic_m() bool {
 	// could happen in a signal handler, or in a throw, or inside
 	// malloc itself. We want to catch if an allocation ever does
 	// happen (even if we're not in one of these situations).
-	_g_.m.mallocing++
+	gp.m.mallocing++
 
 	// If we're dying because of a bad lock count, set it to a
 	// good lock count so we don't recursively panic below.
-	if _g_.m.locks < 0 {
-		_g_.m.locks = 1
+	if gp.m.locks < 0 {
+		gp.m.locks = 1
 	}
 
-	switch _g_.m.dying {
+	switch gp.m.dying {
 	case 0:
 		// Setting dying >0 has the side-effect of disabling this G's writebuf.
-		_g_.m.dying = 1
+		gp.m.dying = 1
 		atomic.Xadd(&panicking, 1)
 		lock(&paniclk)
 		if debug.schedtrace > 0 || debug.scheddetail > 0 {
@@ -1220,13 +1220,13 @@ func startpanic_m() bool {
 	case 1:
 		// Something failed while panicking.
 		// Just print a stack trace and exit.
-		_g_.m.dying = 2
+		gp.m.dying = 2
 		print("panic during panic\n")
 		return false
 	case 2:
 		// This is a genuine bug in the runtime, we couldn't even
 		// print the stack trace successfully.
-		_g_.m.dying = 3
+		gp.m.dying = 3
 		print("stack trace unavailable\n")
 		exit(4)
 		fallthrough

src/runtime/race.go

@@ -67,21 +67,21 @@ func RaceReleaseMerge(addr unsafe.Pointer) {
 // Non-synchronization events (memory accesses, function entry/exit) still affect
 // the race detector.
 func RaceDisable() {
-	_g_ := getg()
-	if _g_.raceignore == 0 {
-		racecall(&__tsan_go_ignore_sync_begin, _g_.racectx, 0, 0, 0)
+	gp := getg()
+	if gp.raceignore == 0 {
+		racecall(&__tsan_go_ignore_sync_begin, gp.racectx, 0, 0, 0)
 	}
-	_g_.raceignore++
+	gp.raceignore++
 }
 
 //go:nosplit
 
 // RaceEnable re-enables handling of race events in the current goroutine.
 func RaceEnable() {
-	_g_ := getg()
-	_g_.raceignore--
-	if _g_.raceignore == 0 {
-		racecall(&__tsan_go_ignore_sync_end, _g_.racectx, 0, 0, 0)
+	gp := getg()
+	gp.raceignore--
+	if gp.raceignore == 0 {
+		racecall(&__tsan_go_ignore_sync_end, gp.racectx, 0, 0, 0)
 	}
 }
 
@@ -453,12 +453,12 @@ func racefree(p unsafe.Pointer, sz uintptr) {
 
 //go:nosplit
 func racegostart(pc uintptr) uintptr {
-	_g_ := getg()
+	gp := getg()
 	var spawng *g
-	if _g_.m.curg != nil {
-		spawng = _g_.m.curg
+	if gp.m.curg != nil {
+		spawng = gp.m.curg
 	} else {
-		spawng = _g_
+		spawng = gp
 	}
 
 	var racectx uintptr
@@ -478,8 +478,8 @@ func racectxend(racectx uintptr) {
 
 //go:nosplit
 func racewriterangepc(addr unsafe.Pointer, sz, callpc, pc uintptr) {
-	_g_ := getg()
-	if _g_ != _g_.m.curg {
+	gp := getg()
+	if gp != gp.m.curg {
 		// The call is coming from manual instrumentation of Go code running on g0/gsignal.
 		// Not interesting.
 		return
@@ -495,8 +495,8 @@ func racewriterangepc(addr unsafe.Pointer, sz, callpc, pc uintptr) {
 
 //go:nosplit
 func racereadrangepc(addr unsafe.Pointer, sz, callpc, pc uintptr) {
-	_g_ := getg()
-	if _g_ != _g_.m.curg {
+	gp := getg()
+	if gp != gp.m.curg {
 		// The call is coming from manual instrumentation of Go code running on g0/gsignal.
 		// Not interesting.
 		return

src/runtime/rdebug.go

@@ -15,8 +15,8 @@ func setMaxStack(in int) (out int) {
 
 //go:linkname setPanicOnFault runtime/debug.setPanicOnFault
 func setPanicOnFault(new bool) (old bool) {
-	_g_ := getg()
-	old = _g_.paniconfault
-	_g_.paniconfault = new
+	gp := getg()
+	old = gp.paniconfault
+	gp.paniconfault = new
 	return old
 }

src/runtime/runtime1.go

@@ -35,13 +35,13 @@ var traceback_env uint32
 //
 //go:nosplit
 func gotraceback() (level int32, all, crash bool) {
-	_g_ := getg()
+	gp := getg()
 	t := atomic.Load(&traceback_cache)
 	crash = t&tracebackCrash != 0
-	all = _g_.m.throwing >= throwTypeUser || t&tracebackAll != 0
-	if _g_.m.traceback != 0 {
-		level = int32(_g_.m.traceback)
-	} else if _g_.m.throwing >= throwTypeRuntime {
+	all = gp.m.throwing >= throwTypeUser || t&tracebackAll != 0
+	if gp.m.traceback != 0 {
+		level = int32(gp.m.traceback)
+	} else if gp.m.throwing >= throwTypeRuntime {
 		// Always include runtime frames in runtime throws unless
 		// otherwise overridden by m.traceback.
 		level = 2
@@ -474,18 +474,18 @@ func timediv(v int64, div int32, rem *int32) int32 {
 
 //go:nosplit
 func acquirem() *m {
-	_g_ := getg()
-	_g_.m.locks++
-	return _g_.m
+	gp := getg()
+	gp.m.locks++
+	return gp.m
 }
 
 //go:nosplit
 func releasem(mp *m) {
-	_g_ := getg()
+	gp := getg()
 	mp.locks--
-	if mp.locks == 0 && _g_.preempt {
+	if mp.locks == 0 && gp.preempt {
 		// restore the preemption request in case we've cleared it in newstack
-		_g_.stackguard0 = stackPreempt
+		gp.stackguard0 = stackPreempt
 	}
 }
 

src/runtime/trace.go

@@ -1254,16 +1254,16 @@ func traceGoCreate(newg *g, pc uintptr) {
 }
 
 func traceGoStart() {
-	_g_ := getg().m.curg
-	pp := _g_.m.p
-	_g_.traceseq++
+	gp := getg().m.curg
+	pp := gp.m.p
+	gp.traceseq++
 	if pp.ptr().gcMarkWorkerMode != gcMarkWorkerNotWorker {
-		traceEvent(traceEvGoStartLabel, -1, uint64(_g_.goid), _g_.traceseq, trace.markWorkerLabels[pp.ptr().gcMarkWorkerMode])
-	} else if _g_.tracelastp == pp {
-		traceEvent(traceEvGoStartLocal, -1, uint64(_g_.goid))
+		traceEvent(traceEvGoStartLabel, -1, uint64(gp.goid), gp.traceseq, trace.markWorkerLabels[pp.ptr().gcMarkWorkerMode])
+	} else if gp.tracelastp == pp {
+		traceEvent(traceEvGoStartLocal, -1, uint64(gp.goid))
 	} else {
-		_g_.tracelastp = pp
-		traceEvent(traceEvGoStart, -1, uint64(_g_.goid), _g_.traceseq)
+		gp.tracelastp = pp
+		traceEvent(traceEvGoStart, -1, uint64(gp.goid), gp.traceseq)
 	}
 }
 
@@ -1272,14 +1272,14 @@ func traceGoEnd() {
 }
 
 func traceGoSched() {
-	_g_ := getg()
-	_g_.tracelastp = _g_.m.p
+	gp := getg()
+	gp.tracelastp = gp.m.p
 	traceEvent(traceEvGoSched, 1)
 }
 
 func traceGoPreempt() {
-	_g_ := getg()
-	_g_.tracelastp = _g_.m.p
+	gp := getg()
+	gp.tracelastp = gp.m.p
 	traceEvent(traceEvGoPreempt, 1)
 }
 
@@ -1318,10 +1318,10 @@ func traceGoSysExit(ts int64) {
 		// aka right now), and assign a fresh time stamp to keep the log consistent.
 		ts = 0
 	}
-	_g_ := getg().m.curg
-	_g_.traceseq++
-	_g_.tracelastp = _g_.m.p
-	traceEvent(traceEvGoSysExit, -1, uint64(_g_.goid), _g_.traceseq, uint64(ts)/traceTickDiv)
+	gp := getg().m.curg
+	gp.traceseq++
+	gp.tracelastp = gp.m.p
+	traceEvent(traceEvGoSysExit, -1, uint64(gp.goid), gp.traceseq, uint64(ts)/traceTickDiv)
 }
 
 func traceGoSysBlock(pp *p) {