// on and then pick up on the frame offsets of specific
	// variables.
	//
	// Stack slot merging is a greedy algorithm, and there can
	// be many possible ways to overlap a given set of candidate
	// variables, all of them legal. Rather than locking down
	// a specific set of overlappings or frame offsets, this
	// tests just verifies that there is a decent-sized clump of 4+ vars that

	defer func() {
		if err != nil {
			err = fmt.Errorf("slog: level string %q: %w", s, err)
		}
	}()

	name := s
	offset := 0
	if i := strings.IndexAny(s, "+-"); i >= 0 {
		name = s[:i]
		offset, err = strconv.Atoi(s[i:])
		if err != nil {
			return err
		}
	}
	switch strings.ToUpper(name) {
	case "DEBUG":
		*l = LevelDebug
	case "INFO":
		*l = LevelInfo
	case "WARN":

	}

	// check invariants
	const xsize = fsize + 5
	for offset := -xsize; offset < xsize; offset++ {
		want1 := f.Offset(Pos(f.base + offset))
		if got := f.Offset(f.Pos(offset)); got != want1 {
			t.Errorf("offset = %d, want %d", got, want1)
		}

		want2 := f.Pos(offset)
		if got := f.Pos(f.Offset(want2)); got != want2 {
			t.Errorf("pos = %d, want %d", got, want2)
		}
	}

	}

	return false
}

// overlap reports whether the ranges given by the given offset and
// size pairs overlap.
func overlap(offset1, size1, offset2, size2 int64) bool {
	if offset1 >= offset2 && offset2+size2 > offset1 {
		return true
	}
	if offset2 >= offset1 && offset1+size1 > offset2 {
		return true
	}
	return false
}

Adding an offset to the name refers to that offset from the symbol's address, so
<code>foo+4(SB)</code> is four bytes past the start of <code>foo</code>.
</p>

<p>
The <code>FP</code> pseudo-register is a virtual frame pointer
used to refer to function arguments.
The compilers maintain a virtual frame pointer and refer to the arguments on the stack as offsets from that pseudo-register.

	4, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1,
	2, 2, 2, 2, 2, 2, 2, 2, 2, 3, 2, 1, 1, 1, 1, 1,
	-1, -1, -1, -1,
}

// offsetPredefinedDistribution is the predefined distribution table
// for offsets. RFC 3.1.1.3.2.2.3.
var offsetPredefinedDistribution = []int16{
	1, 1, 1, 1, 1, 1, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1,
	1, 1, 1, 1, 1, 1, 1, 1, -1, -1, -1, -1, -1,
}

	Lstlen   uint32 // Length of string table
	Limpoff  uint64 // Offset to start of import file IDs
	Lstoff   uint64 // Offset to start of string table
	Lsymoff  uint64 // Offset to start of symbol table
	Lrldoff  uint64 // Offset to start of relocation entries
}

// Loader Symbol
type XcoffLdSym64 struct {
	Lvalue  uint64 // Address field
	Loffset uint32 // Byte offset into string table of symbol name

// and treat the offset as an identifier. We use negative offsets that
// do not overlap with any compile-time module offsets.
//
// Entries are created by reflect.addReflectOff.
var reflectOffs struct {
	lock mutex
	next int32
	m    map[int32]unsafe.Pointer
	minv map[unsafe.Pointer]int32
}

func reflectOffsLock() {
	lock(&reflectOffs.lock)
	if raceenabled {

		binaryOnly uint32 bool
		cgoDirectives string offset // the #cgo directive lines in the comment on import "C"
		goBuildConstraint  - string offset
		len(plusBuildConstraints) - uint32
		plusBuildConstraints - [n]uint32 (string offsets)
		len(imports) uint32
		for each rawImport:
			path - string offset
			position - file, offset, line, column - uint32
		len(embeds) uint32
		for each embed:

/**
 * Checks the data in the content of the documents for equality structurally, ignoring:
 * * the [DeclarativeDocument] implementations,
 * * the differences in the source information, like source identifiers or the offsets in the source data,
 * * the source representations of the literal values (thus taking into account only the values),
 * * the error causes, thus considering all error nodes equal to each other but not to any other node.
 */