1 files changed, 0 insertions, 379 deletions
diff --git a/vendor/golang.org/x/tools/go/internal/pkgbits/encoder.go b/vendor/golang.org/x/tools/go/internal/pkgbits/encoder.go
deleted file mode 100644
index c50c838c..00000000
--- a/vendor/golang.org/x/tools/go/internal/pkgbits/encoder.go
+++ /dev/null
@@ -1,379 +0,0 @@
-// Copyright 2021 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-package pkgbits
-
-import (
-	"bytes"
-	"crypto/md5"
-	"encoding/binary"
-	"go/constant"
-	"io"
-	"math/big"
-	"runtime"
-)
-
-// currentVersion is the current version number.
-//
-//   - v0: initial prototype
-//
-//   - v1: adds the flags uint32 word
-const currentVersion uint32 = 1
-
-// A PkgEncoder provides methods for encoding a package's Unified IR
-// export data.
-type PkgEncoder struct {
-	// elems holds the bitstream for previously encoded elements.
-	elems [numRelocs][]string
-
-	// stringsIdx maps previously encoded strings to their index within
-	// the RelocString section, to allow deduplication. That is,
-	// elems[RelocString][stringsIdx[s]] == s (if present).
-	stringsIdx map[string]Index
-
-	// syncFrames is the number of frames to write at each sync
-	// marker. A negative value means sync markers are omitted.
-	syncFrames int
-}
-
-// SyncMarkers reports whether pw uses sync markers.
-func (pw *PkgEncoder) SyncMarkers() bool { return pw.syncFrames >= 0 }
-
-// NewPkgEncoder returns an initialized PkgEncoder.
-//
-// syncFrames is the number of caller frames that should be serialized
-// at Sync points. Serializing additional frames results in larger
-// export data files, but can help diagnosing desync errors in
-// higher-level Unified IR reader/writer code. If syncFrames is
-// negative, then sync markers are omitted entirely.
-func NewPkgEncoder(syncFrames int) PkgEncoder {
-	return PkgEncoder{
-		stringsIdx: make(map[string]Index),
-		syncFrames: syncFrames,
-	}
-}
-
-// DumpTo writes the package's encoded data to out0 and returns the
-// package fingerprint.
-func (pw *PkgEncoder) DumpTo(out0 io.Writer) (fingerprint [8]byte) {
-	h := md5.New()
-	out := io.MultiWriter(out0, h)
-
-	writeUint32 := func(x uint32) {
-		assert(binary.Write(out, binary.LittleEndian, x) == nil)
-	}
-
-	writeUint32(currentVersion)
-
-	var flags uint32
-	if pw.SyncMarkers() {
-		flags |= flagSyncMarkers
-	}
-	writeUint32(flags)
-
-	// Write elemEndsEnds.
-	var sum uint32
-	for _, elems := range &pw.elems {
-		sum += uint32(len(elems))
-		writeUint32(sum)
-	}
-
-	// Write elemEnds.
-	sum = 0
-	for _, elems := range &pw.elems {
-		for _, elem := range elems {
-			sum += uint32(len(elem))
-			writeUint32(sum)
-		}
-	}
-
-	// Write elemData.
-	for _, elems := range &pw.elems {
-		for _, elem := range elems {
-			_, err := io.WriteString(out, elem)
-			assert(err == nil)
-		}
-	}
-
-	// Write fingerprint.
-	copy(fingerprint[:], h.Sum(nil))
-	_, err := out0.Write(fingerprint[:])
-	assert(err == nil)
-
-	return
-}
-
-// StringIdx adds a string value to the strings section, if not
-// already present, and returns its index.
-func (pw *PkgEncoder) StringIdx(s string) Index {
-	if idx, ok := pw.stringsIdx[s]; ok {
-		assert(pw.elems[RelocString][idx] == s)
-		return idx
-	}
-
-	idx := Index(len(pw.elems[RelocString]))
-	pw.elems[RelocString] = append(pw.elems[RelocString], s)
-	pw.stringsIdx[s] = idx
-	return idx
-}
-
-// NewEncoder returns an Encoder for a new element within the given
-// section, and encodes the given SyncMarker as the start of the
-// element bitstream.
-func (pw *PkgEncoder) NewEncoder(k RelocKind, marker SyncMarker) Encoder {
-	e := pw.NewEncoderRaw(k)
-	e.Sync(marker)
-	return e
-}
-
-// NewEncoderRaw returns an Encoder for a new element within the given
-// section.
-//
-// Most callers should use NewEncoder instead.
-func (pw *PkgEncoder) NewEncoderRaw(k RelocKind) Encoder {
-	idx := Index(len(pw.elems[k]))
-	pw.elems[k] = append(pw.elems[k], "") // placeholder
-
-	return Encoder{
-		p:   pw,
-		k:   k,
-		Idx: idx,
-	}
-}
-
-// An Encoder provides methods for encoding an individual element's
-// bitstream data.
-type Encoder struct {
-	p *PkgEncoder
-
-	Relocs []RelocEnt
-	Data   bytes.Buffer // accumulated element bitstream data
-
-	encodingRelocHeader bool
-
-	k   RelocKind
-	Idx Index // index within relocation section
-}
-
-// Flush finalizes the element's bitstream and returns its Index.
-func (w *Encoder) Flush() Index {
-	var sb bytes.Buffer // TODO(mdempsky): strings.Builder after #44505 is resolved
-
-	// Backup the data so we write the relocations at the front.
-	var tmp bytes.Buffer
-	io.Copy(&tmp, &w.Data)
-
-	// TODO(mdempsky): Consider writing these out separately so they're
-	// easier to strip, along with function bodies, so that we can prune
-	// down to just the data that's relevant to go/types.
-	if w.encodingRelocHeader {
-		panic("encodingRelocHeader already true; recursive flush?")
-	}
-	w.encodingRelocHeader = true
-	w.Sync(SyncRelocs)
-	w.Len(len(w.Relocs))
-	for _, rEnt := range w.Relocs {
-		w.Sync(SyncReloc)
-		w.Len(int(rEnt.Kind))
-		w.Len(int(rEnt.Idx))
-	}
-
-	io.Copy(&sb, &w.Data)
-	io.Copy(&sb, &tmp)
-	w.p.elems[w.k][w.Idx] = sb.String()
-
-	return w.Idx
-}
-
-func (w *Encoder) checkErr(err error) {
-	if err != nil {
-		errorf("unexpected encoding error: %v", err)
-	}
-}
-
-func (w *Encoder) rawUvarint(x uint64) {
-	var buf [binary.MaxVarintLen64]byte
-	n := binary.PutUvarint(buf[:], x)
-	_, err := w.Data.Write(buf[:n])
-	w.checkErr(err)
-}
-
-func (w *Encoder) rawVarint(x int64) {
-	// Zig-zag encode.
-	ux := uint64(x) << 1
-	if x < 0 {
-		ux = ^ux
-	}
-
-	w.rawUvarint(ux)
-}
-
-func (w *Encoder) rawReloc(r RelocKind, idx Index) int {
-	// TODO(mdempsky): Use map for lookup; this takes quadratic time.
-	for i, rEnt := range w.Relocs {
-		if rEnt.Kind == r && rEnt.Idx == idx {
-			return i
-		}
-	}
-
-	i := len(w.Relocs)
-	w.Relocs = append(w.Relocs, RelocEnt{r, idx})
-	return i
-}
-
-func (w *Encoder) Sync(m SyncMarker) {
-	if !w.p.SyncMarkers() {
-		return
-	}
-
-	// Writing out stack frame string references requires working
-	// relocations, but writing out the relocations themselves involves
-	// sync markers. To prevent infinite recursion, we simply trim the
-	// stack frame for sync markers within the relocation header.
-	var frames []string
-	if !w.encodingRelocHeader && w.p.syncFrames > 0 {
-		pcs := make([]uintptr, w.p.syncFrames)
-		n := runtime.Callers(2, pcs)
-		frames = fmtFrames(pcs[:n]...)
-	}
-
-	// TODO(mdempsky): Save space by writing out stack frames as a
-	// linked list so we can share common stack frames.
-	w.rawUvarint(uint64(m))
-	w.rawUvarint(uint64(len(frames)))
-	for _, frame := range frames {
-		w.rawUvarint(uint64(w.rawReloc(RelocString, w.p.StringIdx(frame))))
-	}
-}
-
-// Bool encodes and writes a bool value into the element bitstream,
-// and then returns the bool value.
-//
-// For simple, 2-alternative encodings, the idiomatic way to call Bool
-// is something like:
-//
-//	if w.Bool(x != 0) {
-//		// alternative #1
-//	} else {
-//		// alternative #2
-//	}
-//
-// For multi-alternative encodings, use Code instead.
-func (w *Encoder) Bool(b bool) bool {
-	w.Sync(SyncBool)
-	var x byte
-	if b {
-		x = 1
-	}
-	err := w.Data.WriteByte(x)
-	w.checkErr(err)
-	return b
-}
-
-// Int64 encodes and writes an int64 value into the element bitstream.
-func (w *Encoder) Int64(x int64) {
-	w.Sync(SyncInt64)
-	w.rawVarint(x)
-}
-
-// Uint64 encodes and writes a uint64 value into the element bitstream.
-func (w *Encoder) Uint64(x uint64) {
-	w.Sync(SyncUint64)
-	w.rawUvarint(x)
-}
-
-// Len encodes and writes a non-negative int value into the element bitstream.
-func (w *Encoder) Len(x int) { assert(x >= 0); w.Uint64(uint64(x)) }
-
-// Int encodes and writes an int value into the element bitstream.
-func (w *Encoder) Int(x int) { w.Int64(int64(x)) }
-
-// Len encodes and writes a uint value into the element bitstream.
-func (w *Encoder) Uint(x uint) { w.Uint64(uint64(x)) }
-
-// Reloc encodes and writes a relocation for the given (section,
-// index) pair into the element bitstream.
-//
-// Note: Only the index is formally written into the element
-// bitstream, so bitstream decoders must know from context which
-// section an encoded relocation refers to.
-func (w *Encoder) Reloc(r RelocKind, idx Index) {
-	w.Sync(SyncUseReloc)
-	w.Len(w.rawReloc(r, idx))
-}
-
-// Code encodes and writes a Code value into the element bitstream.
-func (w *Encoder) Code(c Code) {
-	w.Sync(c.Marker())
-	w.Len(c.Value())
-}
-
-// String encodes and writes a string value into the element
-// bitstream.
-//
-// Internally, strings are deduplicated by adding them to the strings
-// section (if not already present), and then writing a relocation
-// into the element bitstream.
-func (w *Encoder) String(s string) {
-	w.Sync(SyncString)
-	w.Reloc(RelocString, w.p.StringIdx(s))
-}
-
-// Strings encodes and writes a variable-length slice of strings into
-// the element bitstream.
-func (w *Encoder) Strings(ss []string) {
-	w.Len(len(ss))
-	for _, s := range ss {
-		w.String(s)
-	}
-}
-
-// Value encodes and writes a constant.Value into the element
-// bitstream.
-func (w *Encoder) Value(val constant.Value) {
-	w.Sync(SyncValue)
-	if w.Bool(val.Kind() == constant.Complex) {
-		w.scalar(constant.Real(val))
-		w.scalar(constant.Imag(val))
-	} else {
-		w.scalar(val)
-	}
-}
-
-func (w *Encoder) scalar(val constant.Value) {
-	switch v := constant.Val(val).(type) {
-	default:
-		errorf("unhandled %v (%v)", val, val.Kind())
-	case bool:
-		w.Code(ValBool)
-		w.Bool(v)
-	case string:
-		w.Code(ValString)
-		w.String(v)
-	case int64:
-		w.Code(ValInt64)
-		w.Int64(v)
-	case *big.Int:
-		w.Code(ValBigInt)
-		w.bigInt(v)
-	case *big.Rat:
-		w.Code(ValBigRat)
-		w.bigInt(v.Num())
-		w.bigInt(v.Denom())
-	case *big.Float:
-		w.Code(ValBigFloat)
-		w.bigFloat(v)
-	}
-}
-
-func (w *Encoder) bigInt(v *big.Int) {
-	b := v.Bytes()
-	w.String(string(b)) // TODO: More efficient encoding.
-	w.Bool(v.Sign() < 0)
-}
-
-func (w *Encoder) bigFloat(v *big.Float) {
-	b := v.Append(nil, 'p', -1)
-	w.String(string(b)) // TODO: More efficient encoding.
-}