func (u *inlineUnwinder) resolveInternal(pc uintptr) inlineFrame {
	return inlineFrame{
		pc: pc,
		// Conveniently, this returns -1 if there's an error, which is the same
		// value we use for the outermost frame.
		index: pcdatavalue1(u.f, abi.PCDATA_InlTreeIndex, pc, false),
	}
}

func (uf inlineFrame) valid() bool {
	return uf.pc != 0
}

// next returns the frame representing uf's logical caller.

		if pfx := "runtime."; len(name) > len(pfx) && name[:len(pfx)] == pfx {
			ret = debugCallRuntime
			return
		}

		// Check that this isn't an unsafe-point.
		if pc != f.entry() {
			pc--
		}
		up := pcdatavalue(f, abi.PCDATA_UnsafePoint, pc)
		if up != abi.UnsafePointSafe {
			// Not at a safe point.
			ret = debugCallUnsafePoint
		}
	})
	return ret
}