++++
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++++

A build scan is a *representation of metadata captured* as you run your build.

image::gradle-basic-1.png[]

 │                          │
 │  <span style="background-color:#272822"><font color="#FF4689">from</font></span><span style="background-color:#272822"><font color="#F8F8F2"> main </font></span><span style="background-color:#272822"><font color="#FF4689">import</font></span><span style="background-color:#272822"><font color="#F8F8F2"> app</font></span><span style="background-color:#272822">  </span>  │
 │                          │

	// Write out all the heap spans and heap objects.
	for _, s := range mheap_.allspans {
		if s.state.get() == mSpanDead {
			continue
		}
		// It's some kind of span, so trace that it exists.
		trace.SpanExists(s)

		// Write out allocated objects if it's a heap span.
		if s.state.get() != mSpanInUse {
			continue
		}

		// Find all allocated objects.
		abits := s.allocBitsForIndex(0)

++++
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++++

== For Software Developers

		rzSize := computeRZlog(span.elemsize)
		span.elemsize -= rzSize
		span.largeType.Size_ = span.elemsize
		rzStart := span.base() + span.elemsize
		span.userArenaChunkFree = makeAddrRange(span.base(), rzStart)
		asanpoison(unsafe.Pointer(rzStart), span.limit-rzStart)
		asanunpoison(unsafe.Pointer(span.base()), span.elemsize)
	}

	if rate := MemProfileRate; rate > 0 {
		c := getMCache(mp)
		if c == nil {

const (
	_ traceEv = 127 + iota

	// Experimental events for ExperimentAllocFree.

	// Experimental heap span events. IDs map reversibly to base addresses.
	traceEvSpan      // heap span exists [timestamp, id, npages, type/class]
	traceEvSpanAlloc // heap span alloc [timestamp, id, npages, type/class]
	traceEvSpanFree  // heap span free [timestamp, id]

	// Experimental heap object events. IDs map reversibly to addresses.

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++++

Build engineers that are ready to configure custom build logic and write their own plugins should start here.

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		}

		// Check if val points to a heap span.
		span := spanOfHeap(val)
		if span == nil {
			continue
		}

		// Check if val points to an allocated object.
		idx := span.objIndex(val)
		if span.isFree(idx) {
			continue
		}

		// val points to an allocated object. Mark it.
		obj := span.base() + idx*span.elemsize
		greyobject(obj, b, i, span, gcw, idx)
	}
}

		return fmt.Errorf("PrepareObjectForStorage failed: %v", err)
	}
	span.AddEvent("About to Encode")
	data, err := runtime.Encode(s.codec, obj)
	if err != nil {
		span.AddEvent("Encode failed", attribute.Int("len", len(data)), attribute.String("err", err.Error()))
		return err
	}
	span.AddEvent("Encode succeeded", attribute.Int("len", len(data)))

	opts, err := s.ttlOpts(ctx, int64(ttl))