//go:linkname msanwrite
//go:noescape
func msanwrite(addr unsafe.Pointer, sz uintptr)

//go:linkname msanmalloc
//go:noescape
func msanmalloc(addr unsafe.Pointer, sz uintptr)

//go:linkname msanfree
//go:noescape
func msanfree(addr unsafe.Pointer, sz uintptr)

//go:linkname msanmove
//go:noescape
func msanmove(dst, src unsafe.Pointer, sz uintptr)

// These are called from msan_GOARCH.s
//

//go:linkname Write runtime.msanwrite
func Write(addr unsafe.Pointer, sz uintptr)

//go:linkname Malloc runtime.msanmalloc
func Malloc(addr unsafe.Pointer, sz uintptr)

//go:linkname Free runtime.msanfree
func Free(addr unsafe.Pointer, sz uintptr)

//go:linkname Move runtime.msanmove

func msanread(addr unsafe.Pointer, sz uintptr)     { throw("msan") }
func msanwrite(addr unsafe.Pointer, sz uintptr)    { throw("msan") }
func msanmalloc(addr unsafe.Pointer, sz uintptr)   { throw("msan") }
func msanfree(addr unsafe.Pointer, sz uintptr)     { throw("msan") }

				}
				// User arenas are handled on explicit free.
				if raceenabled && !s.isUserArenaChunk {
					racefree(unsafe.Pointer(x), size)
				}
				if msanenabled && !s.isUserArenaChunk {
					msanfree(unsafe.Pointer(x), size)
				}
				if asanenabled && !s.isUserArenaChunk {
					asanpoison(unsafe.Pointer(x), size)
				}
			}
			mbits.advance()
			abits.advance()
		}
	}

		}
		return
	}
	if traceAllocFreeEnabled() {
		trace := traceTryAcquire()
		if trace.ok() {
			trace.GoroutineStackFree(uintptr(v))
			traceRelease(trace)
		}
	}
	if msanenabled {
		msanfree(v, n)
	}
	if asanenabled {
		asanpoison(v, n)
	}
	if n < fixedStack<<_NumStackOrders && n < _StackCacheSize {
		order := uint8(0)
		n2 := n
		for n2 > fixedStack {
			order++
			n2 >>= 1

	}

	// Mark the region as free to various sanitizers immediately instead
	// of handling them at sweep time.
	if raceenabled {
		racefree(unsafe.Pointer(s.base()), s.elemsize)
	}
	if msanenabled {
		msanfree(unsafe.Pointer(s.base()), s.elemsize)
	}
	if asanenabled {
		asanpoison(unsafe.Pointer(s.base()), s.elemsize)
	}

	// Make ourselves non-preemptible as we manipulate state and statistics.
	//

		if traceAllocFreeEnabled() {
			trace := traceTryAcquire()
			if trace.ok() {
				trace.SpanFree(s)
				traceRelease(trace)
			}
		}

		lock(&h.lock)
		if msanenabled {
			// Tell msan that this entire span is no longer in use.
			base := unsafe.Pointer(s.base())
			bytes := s.npages << _PageShift
			msanfree(base, bytes)
		}
		if asanenabled {

The MIT License (MIT)

Copyright (c) 2015-2016 Manfred Touron

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is

	tl.eventWriter(traceGoRunning, traceProcRunning).commit(traceEvSpanAlloc, traceSpanID(s), traceArg(s.npages), traceSpanTypeAndClass(s))
}

// SpanFree records an event indicating that the span is about to be freed.
func (tl traceLocker) SpanFree(s *mspan) {
	tl.eventWriter(traceGoRunning, traceProcRunning).commit(traceEvSpanFree, traceSpanID(s))
}

// traceSpanID creates a trace ID for the span s for the trace.

		Name:         "SpanAlloc",
		Args:         []string{"dt", "id", "npages_value", "kindclass"},
		IsTimedEvent: true,
		Experiment:   AllocFree,
	},
	EvSpanFree: event.Spec{
		Name:         "SpanFree",
		Args:         []string{"dt", "id"},
		IsTimedEvent: true,
		Experiment:   AllocFree,
	},
	EvHeapObject: event.Spec{
		Name:         "HeapObject",
		Args:         []string{"dt", "id", "type"},