mirror of
https://gitea.com/Lydanne/buildx.git
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build: add experimental support for print flag
Print flag can be used to make additional information requests about the build and print their results. Currently Dockerfile supports: outline, targets, subrequests.describe Signed-off-by: Tonis Tiigi <tonistiigi@gmail.com>
This commit is contained in:
Tonis Tiigi
181
vendor/github.com/klauspost/compress/huff0/decompress_amd64.go
generated
vendored
181
vendor/github.com/klauspost/compress/huff0/decompress_amd64.go
generated
vendored
@ -2,30 +2,43 @@
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// +build amd64,!appengine,!noasm,gc
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// This file contains the specialisation of Decoder.Decompress4X
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// that uses an asm implementation of its main loop.
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// and Decoder.Decompress1X that use an asm implementation of thir main loops.
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package huff0
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import (
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"errors"
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"fmt"
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"github.com/klauspost/compress/internal/cpuinfo"
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)
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// decompress4x_main_loop_x86 is an x86 assembler implementation
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// of Decompress4X when tablelog > 8.
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// go:noescape
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func decompress4x_main_loop_x86(pbr0, pbr1, pbr2, pbr3 *bitReaderShifted,
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peekBits uint8, buf *byte, tbl *dEntrySingle) uint8
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//go:noescape
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func decompress4x_main_loop_amd64(ctx *decompress4xContext)
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// decompress4x_8b_loop_x86 is an x86 assembler implementation
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// of Decompress4X when tablelog <= 8 which decodes 4 entries
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// per loop.
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// go:noescape
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func decompress4x_8b_loop_x86(pbr0, pbr1, pbr2, pbr3 *bitReaderShifted,
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peekBits uint8, buf *byte, tbl *dEntrySingle) uint8
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//go:noescape
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func decompress4x_8b_main_loop_amd64(ctx *decompress4xContext)
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// fallback8BitSize is the size where using Go version is faster.
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const fallback8BitSize = 800
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type decompress4xContext struct {
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pbr0 *bitReaderShifted
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pbr1 *bitReaderShifted
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pbr2 *bitReaderShifted
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pbr3 *bitReaderShifted
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peekBits uint8
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out *byte
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dstEvery int
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tbl *dEntrySingle
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decoded int
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limit *byte
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}
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// Decompress4X will decompress a 4X encoded stream.
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// The length of the supplied input must match the end of a block exactly.
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// The *capacity* of the dst slice must match the destination size of
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@ -42,6 +55,7 @@ func (d *Decoder) Decompress4X(dst, src []byte) ([]byte, error) {
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if cap(dst) < fallback8BitSize && use8BitTables {
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return d.decompress4X8bit(dst, src)
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}
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var br [4]bitReaderShifted
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// Decode "jump table"
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start := 6
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@ -71,70 +85,28 @@ func (d *Decoder) Decompress4X(dst, src []byte) ([]byte, error) {
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const tlMask = tlSize - 1
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single := d.dt.single[:tlSize]
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// Use temp table to avoid bound checks/append penalty.
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buf := d.buffer()
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var off uint8
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var decoded int
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const debug = false
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// see: bitReaderShifted.peekBitsFast()
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peekBits := uint8((64 - d.actualTableLog) & 63)
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// Decode 2 values from each decoder/loop.
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const bufoff = 256
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for {
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if br[0].off < 4 || br[1].off < 4 || br[2].off < 4 || br[3].off < 4 {
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break
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if len(out) > 4*4 && !(br[0].off < 4 || br[1].off < 4 || br[2].off < 4 || br[3].off < 4) {
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ctx := decompress4xContext{
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pbr0: &br[0],
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pbr1: &br[1],
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pbr2: &br[2],
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pbr3: &br[3],
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peekBits: uint8((64 - d.actualTableLog) & 63), // see: bitReaderShifted.peekBitsFast()
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out: &out[0],
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dstEvery: dstEvery,
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tbl: &single[0],
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limit: &out[dstEvery-4], // Always stop decoding when first buffer gets here to avoid writing OOB on last.
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}
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if use8BitTables {
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off = decompress4x_8b_loop_x86(&br[0], &br[1], &br[2], &br[3], peekBits, &buf[0][0], &single[0])
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decompress4x_8b_main_loop_amd64(&ctx)
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} else {
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off = decompress4x_main_loop_x86(&br[0], &br[1], &br[2], &br[3], peekBits, &buf[0][0], &single[0])
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}
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if debug {
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fmt.Print("DEBUG: ")
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fmt.Printf("off=%d,", off)
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for i := 0; i < 4; i++ {
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fmt.Printf(" br[%d]={bitsRead=%d, value=%x, off=%d}",
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i, br[i].bitsRead, br[i].value, br[i].off)
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}
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fmt.Println("")
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decompress4x_main_loop_amd64(&ctx)
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}
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if off != 0 {
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break
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}
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if bufoff > dstEvery {
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d.bufs.Put(buf)
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return nil, errors.New("corruption detected: stream overrun 1")
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}
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copy(out, buf[0][:])
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copy(out[dstEvery:], buf[1][:])
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copy(out[dstEvery*2:], buf[2][:])
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copy(out[dstEvery*3:], buf[3][:])
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out = out[bufoff:]
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decoded += bufoff * 4
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// There must at least be 3 buffers left.
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if len(out) < dstEvery*3 {
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d.bufs.Put(buf)
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return nil, errors.New("corruption detected: stream overrun 2")
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}
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}
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if off > 0 {
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ioff := int(off)
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if len(out) < dstEvery*3+ioff {
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d.bufs.Put(buf)
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return nil, errors.New("corruption detected: stream overrun 3")
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}
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copy(out, buf[0][:off])
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copy(out[dstEvery:], buf[1][:off])
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copy(out[dstEvery*2:], buf[2][:off])
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copy(out[dstEvery*3:], buf[3][:off])
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decoded += int(off) * 4
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out = out[off:]
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decoded = ctx.decoded
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out = out[decoded/4:]
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}
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// Decode remaining.
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@ -150,7 +122,6 @@ func (d *Decoder) Decompress4X(dst, src []byte) ([]byte, error) {
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for bitsLeft > 0 {
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br.fill()
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if offset >= endsAt {
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d.bufs.Put(buf)
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return nil, errors.New("corruption detected: stream overrun 4")
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}
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@ -164,7 +135,6 @@ func (d *Decoder) Decompress4X(dst, src []byte) ([]byte, error) {
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offset++
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}
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if offset != endsAt {
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d.bufs.Put(buf)
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return nil, fmt.Errorf("corruption detected: short output block %d, end %d != %d", i, offset, endsAt)
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}
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decoded += offset - dstEvery*i
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@ -173,9 +143,86 @@ func (d *Decoder) Decompress4X(dst, src []byte) ([]byte, error) {
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return nil, err
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}
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}
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d.bufs.Put(buf)
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if dstSize != decoded {
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return nil, errors.New("corruption detected: short output block")
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}
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return dst, nil
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}
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// decompress4x_main_loop_x86 is an x86 assembler implementation
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// of Decompress1X when tablelog > 8.
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//go:noescape
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func decompress1x_main_loop_amd64(ctx *decompress1xContext)
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// decompress4x_main_loop_x86 is an x86 with BMI2 assembler implementation
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// of Decompress1X when tablelog > 8.
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//go:noescape
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func decompress1x_main_loop_bmi2(ctx *decompress1xContext)
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type decompress1xContext struct {
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pbr *bitReaderShifted
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peekBits uint8
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out *byte
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outCap int
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tbl *dEntrySingle
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decoded int
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}
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// Error reported by asm implementations
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const error_max_decoded_size_exeeded = -1
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// Decompress1X will decompress a 1X encoded stream.
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// The cap of the output buffer will be the maximum decompressed size.
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// The length of the supplied input must match the end of a block exactly.
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func (d *Decoder) Decompress1X(dst, src []byte) ([]byte, error) {
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if len(d.dt.single) == 0 {
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return nil, errors.New("no table loaded")
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}
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var br bitReaderShifted
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err := br.init(src)
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if err != nil {
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return dst, err
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}
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maxDecodedSize := cap(dst)
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dst = dst[:maxDecodedSize]
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const tlSize = 1 << tableLogMax
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const tlMask = tlSize - 1
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if maxDecodedSize >= 4 {
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ctx := decompress1xContext{
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pbr: &br,
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out: &dst[0],
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outCap: maxDecodedSize,
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peekBits: uint8((64 - d.actualTableLog) & 63), // see: bitReaderShifted.peekBitsFast()
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tbl: &d.dt.single[0],
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}
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if cpuinfo.HasBMI2() {
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decompress1x_main_loop_bmi2(&ctx)
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} else {
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decompress1x_main_loop_amd64(&ctx)
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}
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if ctx.decoded == error_max_decoded_size_exeeded {
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return nil, ErrMaxDecodedSizeExceeded
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}
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dst = dst[:ctx.decoded]
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}
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// br < 8, so uint8 is fine
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bitsLeft := uint8(br.off)*8 + 64 - br.bitsRead
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for bitsLeft > 0 {
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br.fill()
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if len(dst) >= maxDecodedSize {
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br.close()
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return nil, ErrMaxDecodedSizeExceeded
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}
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v := d.dt.single[br.peekBitsFast(d.actualTableLog)&tlMask]
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nBits := uint8(v.entry)
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br.advance(nBits)
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bitsLeft -= nBits
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dst = append(dst, uint8(v.entry>>8))
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}
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return dst, br.close()
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}
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