func decodeValue(ctxt *obj.Link, word uint64) (ID, ID) {
	if ctxt.Arch.PtrSize == 8 {
		b, v := ID(word>>32), ID(word)
		//ctxt.Logf("%#x -> b %#x (%d) v %#x (%d)\n", word, b, b, v, v)
		return b, v
	}
	if ctxt.Arch.PtrSize != 4 {
		panic("unexpected pointer size")
	}
	return ID(word >> 16), ID(int16(word))
}

// Append a pointer-sized uint to buf.

// parseWord skips any leading spaces or comments in data
// and then parses the beginning of data as an identifier or keyword,
// returning that word and what remains after the word.
func parseWord(data []byte) (word, rest []byte) {
	data = skipSpaceOrComment(data)

	// Parse past leading word characters.
	rest = data
	for {
		r, size := utf8.DecodeRune(rest)
		if unicode.IsLetter(r) || '0' <= r && r <= '9' || r == '_' {

## Program and Process

We will talk a lot about the running "**process**", so it's useful to have clarity about what it means, and what's the difference with the word "**program**".

### What is a Program

The word **program** is commonly used to describe many things:

* The **code** that you write, the **Python files**.

const (
	// The ISO polynomial, defined in ISO 3309 and used in HDLC.
	ISO = 0xD800000000000000

	// The ECMA polynomial, defined in ECMA 182.
	ECMA = 0xC96C5795D7870F42
)

// Table is a 256-word table representing the polynomial for efficient processing.
type Table [256]uint64

var (
	slicing8TablesBuildOnce sync.Once
	slicing8TableISO        *[8]Table
	slicing8TableECMA       *[8]Table
)

            ImmutableCapabilities capabilities = variant.getCapabilities();
            MatchResult result;
            if (explicitlyRequested) {
                // some capabilities are explicitly required (in other words, we're not _necessarily_ looking for the default capability
                // so we need to filter the variants
                result = providesAllCapabilities(targetComponent, explicitRequestedCapabilities, capabilities);

    # Correct spellings using locale preferences for US or UK.
    # Default is to use a neutral variety of English.
    # Setting locale to US will correct the British spelling of 'colour' to 'color'.
    locale: US
    ignore-words:
      - cancelled
  lll:
    # max line length, lines longer will be reported. Default is 120.
    # '\t' is counted as 1 character by default, and can be changed with the tab-width option
    line-length: 160

	// addr is the address the iterator is currently working from and describes
	// the address of the first word referenced by mask.
	addr uintptr

	// mask is a bitmask where each bit corresponds to pointer-words after addr.
	// Bit 0 is the pointer-word at addr, Bit 1 is the next word, and so on.
	// If a bit is 1, then there is a pointer at that word.
	// nextFast and next mask out bits in this mask as their pointers are processed.
	mask uintptr

		if etyp.Pointers() {
			emitGCMask(mask, base, etyp, abi.MapBucketCount)
		}
		base += abi.MapBucketCount * etyp.Size_ / goarch.PtrSize

		word := base
		mask[word/8] |= 1 << (word % 8)
		gcdata = &mask[0]
		ptrdata = (word + 1) * goarch.PtrSize

		// overflow word must be last
		if ptrdata != size {
			panic("reflect: bad layout computation in MapOf")
		}
	}

	b := &abi.Type{

)

const (
	// stackDebug == 0: no logging
	//            == 1: logging of per-stack operations
	//            == 2: logging of per-frame operations
	//            == 3: logging of per-word updates
	//            == 4: logging of per-word reads
	stackDebug       = 0
	stackFromSystem  = 0 // allocate stacks from system memory instead of the heap
	stackFaultOnFree = 0 // old stacks are mapped noaccess to detect use after free

//
//	{`normal string`, `quoted-field`}
//
// Within a quoted-field a quote character followed by a second quote
// character is considered a single quote.
//
//	"the ""word"" is true","a ""quoted-field"""
//
// results in
//
//	{`the "word" is true`, `a "quoted-field"`}
//
// Newlines and commas may be included in a quoted-field
//
//	"Multi-line
//	field","comma is ,"
//
// results in
//
//	{`Multi-line