35 строки
979 Б
Go
35 строки
979 Б
Go
// +build gc.conservative gc.extalloc
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// +build !baremetal
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package runtime
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import (
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"unsafe"
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)
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//go:extern runtime.trackedGlobalsStart
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var trackedGlobalsStart uintptr
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//go:extern runtime.trackedGlobalsLength
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var trackedGlobalsLength uintptr
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//go:extern runtime.trackedGlobalsBitmap
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var trackedGlobalsBitmap [0]uint8
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// markGlobals marks all globals, which are reachable by definition.
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//
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// This implementation relies on a compiler pass that stores all globals in a
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// single global (adjusting all uses of them accordingly) and creates a bit
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// vector with the locations of each pointer. This implementation then walks the
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// bit vector and for each pointer it indicates, it marks the root.
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//
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//go:nobounds
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func markGlobals() {
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for i := uintptr(0); i < trackedGlobalsLength; i++ {
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if trackedGlobalsBitmap[i/8]&(1<<(i%8)) != 0 {
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addr := trackedGlobalsStart + i*unsafe.Alignof(uintptr(0))
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root := *(*uintptr)(unsafe.Pointer(addr))
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markRoot(addr, root)
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}
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}
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}
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