runtime: rename scanobject to scanObject

This is long overdue.

Change-Id: I891b114cb581e82b903c20d1c455bbbdad548fe8
Reviewed-on: https://go-review.googlesource.com/c/go/+/690535
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Michael Pratt <mpratt@google.com>
Auto-Submit: Michael Knyszek <mknyszek@google.com>

src/runtime/mbitmap.go

@@ -692,7 +692,7 @@ func (span *mspan) writeHeapBitsSmall(x, dataSize uintptr, typ *_type) (scanSize
 // malloc does not call heapSetType* when there are no pointers.
 //
 // There can be read-write races between heapSetType* and things
-// that read the heap metadata like scanobject. However, since
+// that read the heap metadata like scanObject. However, since
 // heapSetType* is only used for objects that have not yet been
 // made reachable, readers will ignore bits being modified by this
 // function. This does mean this function cannot transiently modify

src/runtime/mgcmark.go

@@ -421,7 +421,7 @@ func gcScanFinalizer(spf *specialfinalizer, s *mspan, gcw *gcWork) {
 	// the object (but *not* the object itself or
 	// we'll never collect it).
 	if !s.spanclass.noscan() {
-		scanobject(p, gcw)
+		scanObject(p, gcw)
 	}
 
 	// The special itself is also a root.
@@ -1255,7 +1255,7 @@ func gcDrain(gcw *gcWork, flags gcDrainFlags) {
 			}
 		}
 		if b != 0 {
-			scanobject(b, gcw)
+			scanObject(b, gcw)
 		} else if s != 0 {
 			scanSpan(s, gcw)
 		} else {
@@ -1359,7 +1359,7 @@ func gcDrainN(gcw *gcWork, scanWork int64) int64 {
 			}
 		}
 		if b != 0 {
-			scanobject(b, gcw)
+			scanObject(b, gcw)
 		} else if s != 0 {
 			scanSpan(s, gcw)
 		} else {
@@ -1390,7 +1390,7 @@ func gcDrainN(gcw *gcWork, scanWork int64) int64 {
 	return workFlushed + gcw.heapScanWork
 }
 
-// scanblock scans b as scanobject would, but using an explicit
+// scanblock scans b as scanObject would, but using an explicit
 // pointer bitmap instead of the heap bitmap.
 //
 // This is used to scan non-heap roots, so it does not update
@@ -1415,7 +1415,7 @@ func scanblock(b0, n0 uintptr, ptrmask *uint8, gcw *gcWork, stk *stackScanState)
 		}
 		for j := 0; j < 8 && i < n; j++ {
 			if bits&1 != 0 {
-				// Same work as in scanobject; see comments there.
+				// Same work as in scanObject; see comments there.
 				p := *(*uintptr)(unsafe.Pointer(b + i))
 				if p != 0 {
 					if stk != nil && p >= stk.stack.lo && p < stk.stack.hi {

src/runtime/mgcmark_greenteagc.go

@@ -852,16 +852,16 @@ func (w *gcWork) flushScanStats(dst *[gc.NumSizeClasses]sizeClassScanStats) {
 	clear(w.stats[:])
 }
 
-// scanobject scans the object starting at b, adding pointers to gcw.
+// scanObject scans the object starting at b, adding pointers to gcw.
 // b must point to the beginning of a heap object or an oblet.
-// scanobject consults the GC bitmap for the pointer mask and the
+// scanObject consults the GC bitmap for the pointer mask and the
 // spans for the size of the object.
 //
 // Used only for !gcUsesSpanInlineMarkBits spans, but supports all
 // object sizes and is safe to be called on all heap objects.
 //
 //go:nowritebarrier
-func scanobject(b uintptr, gcw *gcWork) {
+func scanObject(b uintptr, gcw *gcWork) {
 	// Prefetch object before we scan it.
 	//
 	// This will overlap fetching the beginning of the object with initial
@@ -876,12 +876,12 @@ func scanobject(b uintptr, gcw *gcWork) {
 	s := spanOfUnchecked(b)
 	n := s.elemsize
 	if n == 0 {
-		throw("scanobject n == 0")
+		throw("scanObject n == 0")
 	}
 	if s.spanclass.noscan() {
 		// Correctness-wise this is ok, but it's inefficient
 		// if noscan objects reach here.
-		throw("scanobject of a noscan object")
+		throw("scanObject of a noscan object")
 	}
 
 	var tp typePointers

src/runtime/mgcmark_nogreenteagc.go

@@ -116,13 +116,13 @@ func (w *gcWork) flushScanStats(dst *[gc.NumSizeClasses]sizeClassScanStats) {
 	clear(w.stats[:])
 }
 
-// scanobject scans the object starting at b, adding pointers to gcw.
+// scanObject scans the object starting at b, adding pointers to gcw.
 // b must point to the beginning of a heap object or an oblet.
-// scanobject consults the GC bitmap for the pointer mask and the
+// scanObject consults the GC bitmap for the pointer mask and the
 // spans for the size of the object.
 //
 //go:nowritebarrier
-func scanobject(b uintptr, gcw *gcWork) {
+func scanObject(b uintptr, gcw *gcWork) {
 	// Prefetch object before we scan it.
 	//
 	// This will overlap fetching the beginning of the object with initial
@@ -137,12 +137,12 @@ func scanobject(b uintptr, gcw *gcWork) {
 	s := spanOfUnchecked(b)
 	n := s.elemsize
 	if n == 0 {
-		throw("scanobject n == 0")
+		throw("scanObject n == 0")
 	}
 	if s.spanclass.noscan() {
 		// Correctness-wise this is ok, but it's inefficient
 		// if noscan objects reach here.
-		throw("scanobject of a noscan object")
+		throw("scanObject of a noscan object")
 	}
 
 	var tp typePointers

src/runtime/mheap.go

@@ -2199,7 +2199,7 @@ func addfinalizer(p unsafe.Pointer, f *funcval, nret uintptr, fint *_type, ot *p
 			// Mark everything reachable from the object
 			// so it's retained for the finalizer.
 			if !span.spanclass.noscan() {
-				scanobject(base, gcw)
+				scanObject(base, gcw)
 			}
 			// Mark the finalizer itself, since the
 			// special isn't part of the GC'd heap.

src/runtime/mwbbuf.go

@@ -215,7 +215,7 @@ func wbBufFlush1(pp *p) {
 	// pointers we greyed. We use the buffer itself to temporarily
 	// record greyed pointers.
 	//
-	// TODO: Should scanobject/scanblock just stuff pointers into
+	// TODO: Should scanObject/scanblock just stuff pointers into
 	// the wbBuf? Then this would become the sole greying path.
 	//
 	// TODO: We could avoid shading any of the "new" pointers in