// license that can be found in the LICENSE file.

package codegen

// This file contains code generation tests related to the handling of
// string types.

func CountRunes(s string) int { // Issue #24923
	// amd64:`.*countrunes`
	return len([]rune(s))
}

func CountBytes(s []byte) int {
	// amd64:-`.*runtime.slicebytetostring`
	return len(string(s))
}

func ToByteSlice() []byte { // Issue #24698

	rune1Max = 1<<7 - 1
	rune2Max = 1<<11 - 1
	rune3Max = 1<<16 - 1

	// The default lowest and highest continuation byte.
	locb = 0x80 // 1000 0000
	hicb = 0xBF // 1011 1111
)

// countrunes returns the number of runes in s.
func countrunes(s string) int {
	n := 0
	for range s {
		n++
	}
	return n
}

// decoderune returns the non-ASCII rune at the start of
// s[k:] and the index after the rune in s.
//

	{"runtime.slicebytetostringtmp", 1},
	{"runtime.slicerunetostring", 1},
	{"runtime.stringtoslicebyte", 1},
	{"runtime.stringtoslicerune", 1},
	{"runtime.slicecopy", 1},
	{"runtime.decoderune", 1},
	{"runtime.countrunes", 1},
	{"runtime.convT", 1},
	{"runtime.convTnoptr", 1},
	{"runtime.convT16", 1},
	{"runtime.convT32", 1},
	{"runtime.convT64", 1},
	{"runtime.convTstring", 1},
	{"runtime.convTslice", 1},

func stringtoslicerune(*[32]rune, string) []rune
func slicecopy(toPtr *any, toLen int, fromPtr *any, fromLen int, wid uintptr) int

func decoderune(string, int) (retv rune, retk int)
func countrunes(string) int

// Convert non-interface type to the data word of a (empty or nonempty) interface.
func convT(typ *byte, elem *any) unsafe.Pointer

// Same as convT, for types with no pointers in them.

}

// walkLenCap walks an OLEN or OCAP node.
func walkLenCap(n *ir.UnaryExpr, init *ir.Nodes) ir.Node {
	if isRuneCount(n) {
		// Replace len([]rune(string)) with runtime.countrunes(string).
		return mkcall("countrunes", n.Type(), init, typecheck.Conv(n.X.(*ir.ConvExpr).X, types.Types[types.TSTRING]))
	}
	if isByteCount(n) {
		conv := n.X.(*ir.ConvExpr)
		walkStmtList(conv.Init())

	{"slicebytetostringtmp", funcTag, 45},
	{"slicerunetostring", funcTag, 48},
	{"stringtoslicebyte", funcTag, 50},
	{"stringtoslicerune", funcTag, 53},
	{"slicecopy", funcTag, 54},
	{"decoderune", funcTag, 55},
	{"countrunes", funcTag, 56},
	{"convT", funcTag, 57},
	{"convTnoptr", funcTag, 57},
	{"convT16", funcTag, 59},
	{"convT32", funcTag, 61},
	{"convT64", funcTag, 62},
	{"convTstring", funcTag, 63},
	{"convTslice", funcTag, 66},

				testSequence(t, s)
			}
		}
	}
}

func runtimeRuneCount(s string) int {
	return len([]rune(s)) // Replaced by gc with call to runtime.countrunes(s).
}

// Check that a range loop, len([]rune(string)) optimization and
// []rune conversions visit the same runes.
// Not really a test of this package, but the assumption is used here and
// it's good to verify.

		ir.OMAX,
		ir.OMIN,
		ir.ONEW,
		ir.OREAL,
		ir.ORECOVERFP,
		ir.OSTR2BYTES,
		ir.OSTR2BYTESTMP,
		ir.OSTR2RUNES:

		if isRuneCount(n) {
			// len([]rune(s)) is rewritten to runtime.countrunes(s) later.
			conv := n.(*ir.UnaryExpr).X.(*ir.ConvExpr)
			conv.X = o.expr(conv.X, nil)
		} else {
			o.call(n)
		}

		if lhs == nil || lhs.Op() != ir.ONAME || base.Flag.Cfg.Instrumenting {

}


internal
fun File.readLinesRange() =
    countLines().let { count ->
        if (count == 0L) 0..0L
        else 1..count
    }


private
fun File.countLines(): Long =
    inputStream().buffered().use { input ->
        input.countLines()
    }


private
fun BufferedInputStream.countLines(): Long {
    val buffer = ByteArray(DEFAULT_BUFFER_SIZE)

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