Add dependencies/vendor (whatsapp)

15 files changed, 867 insertions, 0 deletions

diff --git a/vendor/modernc.org/memory/AUTHORS b/vendor/modernc.org/memory/AUTHORS
new file mode 100644
index 00000000..50f44cec
--- /dev/null
+++ b/vendor/modernc.org/memory/AUTHORS
@@ -0,0 +1,12 @@
+# This file lists authors for copyright purposes.  This file is distinct from
+# the CONTRIBUTORS files.  See the latter for an explanation.
+#
+# Names should be added to this file as:
+#     Name or Organization <email address>
+#
+# The email address is not required for organizations.
+#
+# Please keep the list sorted.
+
+Jan Mercl <0xjnml@gmail.com>
+Steffen Butzer <steffen(dot)butzer@outlook.com>
diff --git a/vendor/modernc.org/memory/CONTRIBUTORS b/vendor/modernc.org/memory/CONTRIBUTORS
new file mode 100644
index 00000000..988458ca
--- /dev/null
+++ b/vendor/modernc.org/memory/CONTRIBUTORS
@@ -0,0 +1,10 @@
+# This file lists people who contributed code to this repository.  The AUTHORS
+# file lists the copyright holders; this file lists people.
+#
+# Names should be added to this file like so:
+#     Name <email address>
+#
+# Please keep the list sorted.
+
+Jan Mercl <0xjnml@gmail.com>
+Steffen Butzer <steffen(dot)butzer@outlook.com>
diff --git a/vendor/modernc.org/memory/LICENSE b/vendor/modernc.org/memory/LICENSE
new file mode 100644
index 00000000..967339af
--- /dev/null
+++ b/vendor/modernc.org/memory/LICENSE
@@ -0,0 +1,27 @@
+Copyright (c) 2017 The Memory Authors. All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are
+met:
+
+   * Redistributions of source code must retain the above copyright
+notice, this list of conditions and the following disclaimer.
+   * Redistributions in binary form must reproduce the above
+copyright notice, this list of conditions and the following disclaimer
+in the documentation and/or other materials provided with the
+distribution.
+   * Neither the names of the authors nor the names of the
+contributors may be used to endorse or promote products derived from
+this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
diff --git a/vendor/modernc.org/memory/LICENSE-MMAP-GO b/vendor/modernc.org/memory/LICENSE-MMAP-GO
new file mode 100644
index 00000000..8f05f338
--- /dev/null
+++ b/vendor/modernc.org/memory/LICENSE-MMAP-GO
@@ -0,0 +1,25 @@
+Copyright (c) 2011, Evan Shaw <edsrzf@gmail.com>
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+    * Redistributions of source code must retain the above copyright
+      notice, this list of conditions and the following disclaimer.
+    * Redistributions in binary form must reproduce the above copyright
+      notice, this list of conditions and the following disclaimer in the
+      documentation and/or other materials provided with the distribution.
+    * Neither the name of the copyright holder nor the
+      names of its contributors may be used to endorse or promote products
+      derived from this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT HOLDER> BE LIABLE FOR ANY
+DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
diff --git a/vendor/modernc.org/memory/Makefile b/vendor/modernc.org/memory/Makefile
new file mode 100644
index 00000000..fbb3e4ee
--- /dev/null
+++ b/vendor/modernc.org/memory/Makefile
@@ -0,0 +1,66 @@
+# Copyright 2017 The Memory Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style
+# license that can be found in the LICENSE file.
+
+.PHONY:	all clean cover cpu editor internalError later mem nuke todo edit
+
+grep=--include=*.go --include=*.l --include=*.y --include=*.yy
+ngrep='TODOOK\|parser\.go\|scanner\.go\|.*_string\.go'
+
+all: editor
+	go vet 2>&1 | grep -v $(ngrep) || true
+	golint 2>&1 | grep -v $(ngrep) || true
+	make todo
+	misspell *.go
+	maligned || true
+	unconvert -apply
+	staticcheck | grep -v 'lexer\.go' || true
+	grep -n 'FAIL\|PASS' log
+	date
+
+clean:
+	go clean
+	rm -f *~ *.test *.out
+
+cover:
+	t=$(shell tempfile) ; go test -coverprofile $$t && go tool cover -html $$t && unlink $$t
+
+cpu: clean
+	go test -run @ -bench . -cpuprofile cpu.out
+	go tool pprof -lines *.test cpu.out
+
+edit:
+	@ 1>/dev/null 2>/dev/null gvim -p Makefile *.go &
+
+editor:
+	gofmt -l -s -w *.go
+	GOOS=darwin GOARCH=amd64 go build
+	GOOS=darwin GOARCH=arm64 go build
+	GOOS=linux GOARCH=386 go build
+	GOOS=linux GOARCH=amd64 go build
+	GOOS=linux GOARCH=arm go build
+	GOOS=linux GOARCH=arm64 go build
+	GOOS=linux GOARCH=s390x go build
+	GOOS=windows GOARCH=386 go build
+	GOOS=windows GOARCH=amd64 go build
+	go test 2>&1 | tee log
+
+internalError:
+	egrep -ho '"internal error.*"' *.go | sort | cat -n
+
+later:
+	@grep -n $(grep) LATER * || true
+	@grep -n $(grep) MAYBE * || true
+
+mem: clean
+	go test -run @ -bench . -memprofile mem.out -memprofilerate 1 -timeout 24h
+	go tool pprof -lines -web -alloc_space *.test mem.out
+
+nuke: clean
+	go clean -i
+
+todo:
+	@grep -nr $(grep) ^[[:space:]]*_[[:space:]]*=[[:space:]][[:alpha:]][[:alnum:]]* * | grep -v $(ngrep) || true
+	@grep -nr $(grep) TODO * | grep -v $(ngrep) || true
+	@grep -nr $(grep) BUG * | grep -v $(ngrep) || true
+	@grep -nr $(grep) [^[:alpha:]]println * | grep -v $(ngrep) || true
diff --git a/vendor/modernc.org/memory/README.md b/vendor/modernc.org/memory/README.md
new file mode 100644
index 00000000..9354a365
--- /dev/null
+++ b/vendor/modernc.org/memory/README.md
@@ -0,0 +1,13 @@
+# memory
+
+Package memory implements a memory allocator.
+
+## Build status
+
+available at https://modern-c.appspot.com/-/builder/?importpath=modernc.org%2fmemory
+
+Installation
+
+    $ go get modernc.org/memory
+
+Documentation: [godoc.org/modernc.org/memory](http://godoc.org/modernc.org/memory)
diff --git a/vendor/modernc.org/memory/counters.go b/vendor/modernc.org/memory/counters.go
new file mode 100644
index 00000000..ca4024fc
--- /dev/null
+++ b/vendor/modernc.org/memory/counters.go
@@ -0,0 +1,9 @@
+// Copyright 2017 The Memory Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// +build memory.counters
+
+package memory // import "modernc.org/memory"
+
+const counters = true
diff --git a/vendor/modernc.org/memory/memory.go b/vendor/modernc.org/memory/memory.go
new file mode 100644
index 00000000..bbfaffcf
--- /dev/null
+++ b/vendor/modernc.org/memory/memory.go
@@ -0,0 +1,542 @@
+// Copyright 2017 The Memory 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 memory implements a memory allocator.
+//
+// Build status
+//
+// available at https://modern-c.appspot.com/-/builder/?importpath=modernc.org%2fmemory
+//
+// Changelog
+//
+// 2017-10-03 Added alternative, unsafe.Pointer-based API.
+//
+// Package memory implements a memory allocator.
+//
+// Changelog
+//
+// 2017-10-03 Added alternative, unsafe.Pointer-based API.
+//
+// Benchmarks
+//
+// AMD Ryzen 9 3900X 12-Core Processor × 24
+//
+//  jnml@3900x:~/src/modernc.org/memory$ date ; go version ; go test -run @ -bench . -benchmem |& tee log
+//  Fri Nov 20 17:23:04 CET 2020
+//  go version go1.15.5 linux/amd64
+//  goos: linux
+//  goarch: amd64
+//  pkg: modernc.org/memory
+//  BenchmarkFree16-24             	141188362	         8.26 ns/op	       0 B/op	       0 allocs/op
+//  BenchmarkFree32-24             	100000000	        11.4 ns/op	       0 B/op	       0 allocs/op
+//  BenchmarkFree64-24             	67160647	        18.3 ns/op	       0 B/op	       0 allocs/op
+//  BenchmarkCalloc16-24           	60612698	        19.8 ns/op	       0 B/op	       0 allocs/op
+//  BenchmarkCalloc32-24           	47968105	        23.8 ns/op	       0 B/op	       0 allocs/op
+//  BenchmarkCalloc64-24           	40752181	        28.6 ns/op	       0 B/op	       0 allocs/op
+//  BenchmarkGoCalloc16-24         	66487354	        17.8 ns/op	      16 B/op	       1 allocs/op
+//  BenchmarkGoCalloc32-24         	56009206	        21.2 ns/op	      32 B/op	       1 allocs/op
+//  BenchmarkGoCalloc64-24         	52086571	        23.4 ns/op	      64 B/op	       1 allocs/op
+//  BenchmarkMalloc16-24           	113943390	        10.2 ns/op	       0 B/op	       0 allocs/op
+//  BenchmarkMalloc32-24           	113520471	        10.2 ns/op	       0 B/op	       0 allocs/op
+//  BenchmarkMalloc64-24           	108787056	        10.7 ns/op	       0 B/op	       0 allocs/op
+//  BenchmarkUintptrFree16-24      	146110286	         7.94 ns/op	       0 B/op	       0 allocs/op
+//  BenchmarkUintptrFree32-24      	93052707	        12.0 ns/op	       0 B/op	       0 allocs/op
+//  BenchmarkUintptrFree64-24      	69805262	        17.3 ns/op	       0 B/op	       0 allocs/op
+//  BenchmarkUintptrCalloc16-24    	85282725	        13.7 ns/op	       0 B/op	       0 allocs/op
+//  BenchmarkUintptrCalloc32-24    	66489789	        17.9 ns/op	       0 B/op	       0 allocs/op
+//  BenchmarkUintptrCalloc64-24    	53561092	        22.7 ns/op	       0 B/op	       0 allocs/op
+//  BenchmarkUintptrMalloc16-24    	222978858	         5.28 ns/op	       0 B/op	       0 allocs/op
+//  BenchmarkUintptrMalloc32-24    	210443384	         5.30 ns/op	       0 B/op	       0 allocs/op
+//  BenchmarkUintptrMalloc64-24    	213706227	         5.47 ns/op	       0 B/op	       0 allocs/op
+//  PASS
+//  ok  	modernc.org/memory	70.528s
+//  jnml@3900x:~/src/modernc.org/memory$
+//
+// Intel® Core™ i5-4670 CPU @ 3.40GHz × 4
+//
+//  ==== jnml@4670:~/src/modernc.org/memory> date ; go version ; go test -run @ -bench . -benchmem |& tee log
+//  Sat Dec  8 12:56:53 CET 2018
+//  go version go1.11.2 linux/amd64
+//  goos: linux
+//  goarch: amd64
+//  pkg: modernc.org/memory
+//  BenchmarkFree16-4            	100000000	        14.7 ns/op	       0 B/op	       0 allocs/op
+//  BenchmarkFree32-4            	100000000	        20.5 ns/op	       0 B/op	       0 allocs/op
+//  BenchmarkFree64-4            	50000000	        32.8 ns/op	       0 B/op	       0 allocs/op
+//  BenchmarkCalloc16-4          	50000000	        24.4 ns/op	       0 B/op	       0 allocs/op
+//  BenchmarkCalloc32-4          	50000000	        29.2 ns/op	       0 B/op	       0 allocs/op
+//  BenchmarkCalloc64-4          	50000000	        35.7 ns/op	       0 B/op	       0 allocs/op
+//  BenchmarkGoCalloc16-4        	50000000	        27.0 ns/op	      16 B/op	       1 allocs/op
+//  BenchmarkGoCalloc32-4        	50000000	        27.3 ns/op	      32 B/op	       1 allocs/op
+//  BenchmarkGoCalloc64-4        	30000000	        37.9 ns/op	      64 B/op	       1 allocs/op
+//  BenchmarkMalloc16-4          	100000000	        12.9 ns/op	       0 B/op	       0 allocs/op
+//  BenchmarkMalloc32-4          	100000000	        12.9 ns/op	       0 B/op	       0 allocs/op
+//  BenchmarkMalloc64-4          	100000000	        13.2 ns/op	       0 B/op	       0 allocs/op
+//  BenchmarkUintptrFree16-4     	100000000	        12.0 ns/op	       0 B/op	       0 allocs/op
+//  BenchmarkUintptrFree32-4     	100000000	        17.5 ns/op	       0 B/op	       0 allocs/op
+//  BenchmarkUintptrFree64-4     	50000000	        28.9 ns/op	       0 B/op	       0 allocs/op
+//  BenchmarkUintptrCalloc16-4   	100000000	        17.8 ns/op	       0 B/op	       0 allocs/op
+//  BenchmarkUintptrCalloc32-4   	100000000	        22.9 ns/op	       0 B/op	       0 allocs/op
+//  BenchmarkUintptrCalloc64-4   	50000000	        29.6 ns/op	       0 B/op	       0 allocs/op
+//  BenchmarkUintptrMalloc16-4   	200000000	         7.31 ns/op	       0 B/op	       0 allocs/op
+//  BenchmarkUintptrMalloc32-4   	200000000	         7.47 ns/op	       0 B/op	       0 allocs/op
+//  BenchmarkUintptrMalloc64-4   	200000000	         7.68 ns/op	       0 B/op	       0 allocs/op
+//  PASS
+//  ok  	modernc.org/memory	73.859s
+//  //
+// Intel® Xeon(R) CPU E5-1650 v2 @ 3.50GHz × 12
+//
+//  ==== jnml@e5-1650:~/src/modernc.org/memory> date ; go version ; go test -run @ -bench . -benchmem
+//  Fri Dec  7 14:18:50 CET 2018
+//  go version go1.11.2 linux/amd64
+//  goos: linux
+//  goarch: amd64
+//  pkg: modernc.org/memory
+//  BenchmarkFree16-12             	100000000	        16.7 ns/op	       0 B/op	       0 allocs/op
+//  BenchmarkFree32-12             	50000000	        25.0 ns/op	       0 B/op	       0 allocs/op
+//  BenchmarkFree64-12             	30000000	        39.7 ns/op	       0 B/op	       0 allocs/op
+//  BenchmarkCalloc16-12           	50000000	        26.3 ns/op	       0 B/op	       0 allocs/op
+//  BenchmarkCalloc32-12           	50000000	        33.4 ns/op	       0 B/op	       0 allocs/op
+//  BenchmarkCalloc64-12           	30000000	        38.3 ns/op	       0 B/op	       0 allocs/op
+//  BenchmarkGoCalloc16-12         	50000000	        26.6 ns/op	      16 B/op	       1 allocs/op
+//  BenchmarkGoCalloc32-12         	50000000	        26.8 ns/op	      32 B/op	       1 allocs/op
+//  BenchmarkGoCalloc64-12         	30000000	        35.1 ns/op	      64 B/op	       1 allocs/op
+//  BenchmarkMalloc16-12           	100000000	        13.5 ns/op	       0 B/op	       0 allocs/op
+//  BenchmarkMalloc32-12           	100000000	        13.4 ns/op	       0 B/op	       0 allocs/op
+//  BenchmarkMalloc64-12           	100000000	        14.1 ns/op	       0 B/op	       0 allocs/op
+//  BenchmarkUintptrFree16-12      	100000000	        14.4 ns/op	       0 B/op	       0 allocs/op
+//  BenchmarkUintptrFree32-12      	100000000	        21.7 ns/op	       0 B/op	       0 allocs/op
+//  BenchmarkUintptrFree64-12      	50000000	        36.7 ns/op	       0 B/op	       0 allocs/op
+//  BenchmarkUintptrCalloc16-12    	100000000	        20.4 ns/op	       0 B/op	       0 allocs/op
+//  BenchmarkUintptrCalloc32-12    	50000000	        27.1 ns/op	       0 B/op	       0 allocs/op
+//  BenchmarkUintptrCalloc64-12    	50000000	        33.4 ns/op	       0 B/op	       0 allocs/op
+//  BenchmarkUintptrMalloc16-12    	200000000	         8.02 ns/op	       0 B/op	       0 allocs/op
+//  BenchmarkUintptrMalloc32-12    	200000000	         8.28 ns/op	       0 B/op	       0 allocs/op
+//  BenchmarkUintptrMalloc64-12    	200000000	         8.29 ns/op	       0 B/op	       0 allocs/op
+//  PASS
+//  ok  	modernc.org/memory	80.896s
+package memory // import "modernc.org/memory"
+
+import (
+	"fmt"
+	"math/bits"
+	"os"
+	"reflect"
+	"unsafe"
+)
+
+const (
+	headerSize     = unsafe.Sizeof(page{})
+	mallocAllign   = 2 * unsafe.Sizeof(uintptr(0))
+	maxSlotSize    = 1 << maxSlotSizeLog
+	maxSlotSizeLog = pageSizeLog - 2
+	pageAvail      = pageSize - headerSize
+	pageMask       = pageSize - 1
+	pageSize       = 1 << pageSizeLog
+)
+
+func init() {
+	if unsafe.Sizeof(page{})%mallocAllign != 0 {
+		panic("internal error")
+	}
+}
+
+// if n%m != 0 { n += m-n%m }. m must be a power of 2.
+func roundup(n, m int) int { return (n + m - 1) &^ (m - 1) }
+
+type node struct {
+	prev, next uintptr // *node
+}
+
+type page struct {
+	brk  int
+	log  uint
+	size int
+	used int
+}
+
+// Allocator allocates and frees memory. Its zero value is ready for use.  The
+// exported counters are updated only when build tag memory.counters is
+// present.
+type Allocator struct {
+	Allocs int // # of allocs.
+	Bytes  int // Asked from OS.
+	cap    [64]int
+	lists  [64]uintptr          // *node
+	Mmaps  int                  // Asked from OS.
+	pages  [64]uintptr          // *page
+	regs   map[uintptr]struct{} // map[*page]struct{}
+}
+
+func (a *Allocator) mmap(size int) (uintptr /* *page */, error) {
+	p, size, err := mmap(size)
+	if err != nil {
+		return 0, err
+	}
+
+	if counters {
+		a.Mmaps++
+		a.Bytes += size
+	}
+	if a.regs == nil {
+		a.regs = map[uintptr]struct{}{}
+	}
+	(*page)(unsafe.Pointer(p)).size = size
+	a.regs[p] = struct{}{}
+	return p, nil
+}
+
+func (a *Allocator) newPage(size int) (uintptr /* *page */, error) {
+	size += int(headerSize)
+	p, err := a.mmap(size)
+	if err != nil {
+		return 0, err
+	}
+
+	(*page)(unsafe.Pointer(p)).log = 0
+	return p, nil
+}
+
+func (a *Allocator) newSharedPage(log uint) (uintptr /* *page */, error) {
+	if a.cap[log] == 0 {
+		a.cap[log] = int(pageAvail) / (1 << log)
+	}
+	size := int(headerSize) + a.cap[log]<<log
+	p, err := a.mmap(size)
+	if err != nil {
+		return 0, err
+	}
+
+	a.pages[log] = p
+	(*page)(unsafe.Pointer(p)).log = log
+	return p, nil
+}
+
+func (a *Allocator) unmap(p uintptr /* *page */) error {
+	delete(a.regs, p)
+	if counters {
+		a.Mmaps--
+	}
+	return unmap(p, (*page)(unsafe.Pointer(p)).size)
+}
+
+// UintptrCalloc is like Calloc except it returns an uintptr.
+func (a *Allocator) UintptrCalloc(size int) (r uintptr, err error) {
+	if trace {
+		defer func() {
+			fmt.Fprintf(os.Stderr, "Calloc(%#x) %#x, %v\n", size, r, err)
+		}()
+	}
+	if r, err = a.UintptrMalloc(size); r == 0 || err != nil {
+		return 0, err
+	}
+	b := ((*rawmem)(unsafe.Pointer(r)))[:size:size]
+	for i := range b {
+		b[i] = 0
+	}
+	return r, nil
+}
+
+// UintptrFree is like Free except its argument is an uintptr, which must have
+// been acquired from UintptrCalloc or UintptrMalloc or UintptrRealloc.
+func (a *Allocator) UintptrFree(p uintptr) (err error) {
+	if trace {
+		defer func() {
+			fmt.Fprintf(os.Stderr, "Free(%#x) %v\n", p, err)
+		}()
+	}
+	if p == 0 {
+		return nil
+	}
+
+	if counters {
+		a.Allocs--
+	}
+	pg := p &^ uintptr(pageMask)
+	log := (*page)(unsafe.Pointer(pg)).log
+	if log == 0 {
+		if counters {
+			a.Bytes -= (*page)(unsafe.Pointer(pg)).size
+		}
+		return a.unmap(pg)
+	}
+
+	(*node)(unsafe.Pointer(p)).prev = 0
+	(*node)(unsafe.Pointer(p)).next = a.lists[log]
+	if next := (*node)(unsafe.Pointer(p)).next; next != 0 {
+		(*node)(unsafe.Pointer(next)).prev = p
+	}
+	a.lists[log] = p
+	(*page)(unsafe.Pointer(pg)).used--
+	if (*page)(unsafe.Pointer(pg)).used != 0 {
+		return nil
+	}
+
+	for i := 0; i < (*page)(unsafe.Pointer(pg)).brk; i++ {
+		n := pg + headerSize + uintptr(i)<<log
+		next := (*node)(unsafe.Pointer(n)).next
+		prev := (*node)(unsafe.Pointer(n)).prev
+		switch {
+		case prev == 0:
+			a.lists[log] = next
+			if next != 0 {
+				(*node)(unsafe.Pointer(next)).prev = 0
+			}
+		case next == 0:
+			(*node)(unsafe.Pointer(prev)).next = 0
+		default:
+			(*node)(unsafe.Pointer(prev)).next = next
+			(*node)(unsafe.Pointer(next)).prev = prev
+		}
+	}
+
+	if a.pages[log] == pg {
+		a.pages[log] = 0
+	}
+	if counters {
+		a.Bytes -= (*page)(unsafe.Pointer(pg)).size
+	}
+	return a.unmap(pg)
+}
+
+// UintptrMalloc is like Malloc except it returns an uinptr.
+func (a *Allocator) UintptrMalloc(size int) (r uintptr, err error) {
+	if trace {
+		defer func() {
+			fmt.Fprintf(os.Stderr, "Malloc(%#x) %#x, %v\n", size, r, err)
+		}()
+	}
+	if size < 0 {
+		panic("invalid malloc size")
+	}
+
+	if size == 0 {
+		return 0, nil
+	}
+
+	if counters {
+		a.Allocs++
+	}
+	log := uint(bits.Len(uint((size+int(mallocAllign)-1)&^int(mallocAllign-1) - 1)))
+	if log > maxSlotSizeLog {
+		p, err := a.newPage(size)
+		if err != nil {
+			return 0, err
+		}
+
+		return p + headerSize, nil
+	}
+
+	if a.lists[log] == 0 && a.pages[log] == 0 {
+		if _, err := a.newSharedPage(log); err != nil {
+			return 0, err
+		}
+	}
+
+	if p := a.pages[log]; p != 0 {
+		(*page)(unsafe.Pointer(p)).used++
+		(*page)(unsafe.Pointer(p)).brk++
+		if (*page)(unsafe.Pointer(p)).brk == a.cap[log] {
+			a.pages[log] = 0
+		}
+		return p + headerSize + uintptr((*page)(unsafe.Pointer(p)).brk-1)<<log, nil
+	}
+
+	n := a.lists[log]
+	p := n &^ uintptr(pageMask)
+	a.lists[log] = (*node)(unsafe.Pointer(n)).next
+	if next := (*node)(unsafe.Pointer(n)).next; next != 0 {
+		(*node)(unsafe.Pointer(next)).prev = 0
+	}
+	(*page)(unsafe.Pointer(p)).used++
+	return n, nil
+}
+
+// UintptrRealloc is like Realloc except its first argument is an uintptr,
+// which must have been returned from UintptrCalloc, UintptrMalloc or
+// UintptrRealloc.
+func (a *Allocator) UintptrRealloc(p uintptr, size int) (r uintptr, err error) {
+	if trace {
+		defer func() {
+			fmt.Fprintf(os.Stderr, "UnsafeRealloc(%#x, %#x) %#x, %v\n", p, size, r, err)
+		}()
+	}
+	switch {
+	case p == 0:
+		return a.UintptrMalloc(size)
+	case size == 0 && p != 0:
+		return 0, a.UintptrFree(p)
+	}
+
+	us := UintptrUsableSize(p)
+	if us > size {
+		return p, nil
+	}
+
+	if r, err = a.UintptrMalloc(size); err != nil {
+		return 0, err
+	}
+
+	if us < size {
+		size = us
+	}
+	copy((*rawmem)(unsafe.Pointer(r))[:size:size], (*rawmem)(unsafe.Pointer(p))[:size:size])
+	return r, a.UintptrFree(p)
+}
+
+// UintptrUsableSize is like UsableSize except its argument is an uintptr,
+// which must have been returned from UintptrCalloc, UintptrMalloc or
+// UintptrRealloc.
+func UintptrUsableSize(p uintptr) (r int) {
+	if trace {
+		defer func() {
+			fmt.Fprintf(os.Stderr, "UsableSize(%#x) %#x\n", p, r)
+		}()
+	}
+	if p == 0 {
+		return 0
+	}
+
+	return usableSize(p)
+}
+
+func usableSize(p uintptr) (r int) {
+	pg := p &^ uintptr(pageMask)
+	if log := (*page)(unsafe.Pointer(pg)).log; log != 0 {
+		return 1 << log
+	}
+
+	return (*page)(unsafe.Pointer(pg)).size - int(headerSize)
+}
+
+// Calloc is like Malloc except the allocated memory is zeroed.
+func (a *Allocator) Calloc(size int) (r []byte, err error) {
+	p, err := a.UintptrCalloc(size)
+	if err != nil {
+		return nil, err
+	}
+
+	var b []byte
+	sh := (*reflect.SliceHeader)(unsafe.Pointer(&b))
+	sh.Cap = usableSize(p)
+	sh.Data = p
+	sh.Len = size
+	return b, nil
+}
+
+// Close releases all OS resources used by a and sets it to its zero value.
+//
+// It's not necessary to Close the Allocator when exiting a process.
+func (a *Allocator) Close() (err error) {
+	for p := range a.regs {
+		if e := a.unmap(p); e != nil && err == nil {
+			err = e
+		}
+	}
+	*a = Allocator{}
+	return err
+}
+
+// Free deallocates memory (as in C.free). The argument of Free must have been
+// acquired from Calloc or Malloc or Realloc.
+func (a *Allocator) Free(b []byte) (err error) {
+	if b = b[:cap(b)]; len(b) == 0 {
+		return nil
+	}
+
+	return a.UintptrFree(uintptr(unsafe.Pointer(&b[0])))
+}
+
+// Malloc allocates size bytes and returns a byte slice of the allocated
+// memory. The memory is not initialized. Malloc panics for size < 0 and
+// returns (nil, nil) for zero size.
+//
+// It's ok to reslice the returned slice but the result of appending to it
+// cannot be passed to Free or Realloc as it may refer to a different backing
+// array afterwards.
+func (a *Allocator) Malloc(size int) (r []byte, err error) {
+	p, err := a.UintptrMalloc(size)
+	if p == 0 || err != nil {
+		return nil, err
+	}
+
+	sh := (*reflect.SliceHeader)(unsafe.Pointer(&r))
+	sh.Cap = usableSize(p)
+	sh.Data = p
+	sh.Len = size
+	return r, nil
+}
+
+// Realloc changes the size of the backing array of b to size bytes or returns
+// an error, if any.  The contents will be unchanged in the range from the
+// start of the region up to the minimum of the old and new  sizes.   If the
+// new size is larger than the old size, the added memory will not be
+// initialized.  If b's backing array is of zero size, then the call is
+// equivalent to Malloc(size), for all values of size; if size is equal to
+// zero, and b's backing array is not of zero size, then the call is equivalent
+// to Free(b).  Unless b's backing array is of zero size, it must have been
+// returned by an earlier call to Malloc, Calloc or Realloc.  If the area
+// pointed to was moved, a Free(b) is done.
+func (a *Allocator) Realloc(b []byte, size int) (r []byte, err error) {
+	var p uintptr
+	if b = b[:cap(b)]; len(b) != 0 {
+		p = uintptr(unsafe.Pointer(&b[0]))
+	}
+	if p, err = a.UintptrRealloc(p, size); p == 0 || err != nil {
+		return nil, err
+	}
+
+	sh := (*reflect.SliceHeader)(unsafe.Pointer(&r))
+	sh.Cap = usableSize(p)
+	sh.Data = p
+	sh.Len = size
+	return r, nil
+}
+
+// UsableSize reports the size of the memory block allocated at p, which must
+// point to the first byte of a slice returned from Calloc, Malloc or Realloc.
+// The allocated memory block size can be larger than the size originally
+// requested from Calloc, Malloc or Realloc.
+func UsableSize(p *byte) (r int) { return UintptrUsableSize(uintptr(unsafe.Pointer(p))) }
+
+// UnsafeCalloc is like Calloc except it returns an unsafe.Pointer.
+func (a *Allocator) UnsafeCalloc(size int) (r unsafe.Pointer, err error) {
+	p, err := a.UintptrCalloc(size)
+	if err != nil {
+		return nil, err
+	}
+
+	return unsafe.Pointer(p), nil
+}
+
+// UnsafeFree is like Free except its argument is an unsafe.Pointer, which must
+// have been acquired from UnsafeCalloc or UnsafeMalloc or UnsafeRealloc.
+func (a *Allocator) UnsafeFree(p unsafe.Pointer) (err error) { return a.UintptrFree(uintptr(p)) }
+
+// UnsafeMalloc is like Malloc except it returns an unsafe.Pointer.
+func (a *Allocator) UnsafeMalloc(size int) (r unsafe.Pointer, err error) {
+	p, err := a.UintptrMalloc(size)
+	if err != nil {
+		return nil, err
+	}
+
+	return unsafe.Pointer(p), nil
+}
+
+// UnsafeRealloc is like Realloc except its first argument is an
+// unsafe.Pointer, which must have been returned from UnsafeCalloc,
+// UnsafeMalloc or UnsafeRealloc.
+func (a *Allocator) UnsafeRealloc(p unsafe.Pointer, size int) (r unsafe.Pointer, err error) {
+	q, err := a.UintptrRealloc(uintptr(p), size)
+	if err != nil {
+		return nil, err
+	}
+
+	return unsafe.Pointer(q), nil
+}
+
+// UnsafeUsableSize is like UsableSize except its argument is an
+// unsafe.Pointer, which must have been returned from UnsafeCalloc,
+// UnsafeMalloc or UnsafeRealloc.
+func UnsafeUsableSize(p unsafe.Pointer) (r int) { return UintptrUsableSize(uintptr(p)) }
diff --git a/vendor/modernc.org/memory/memory32.go b/vendor/modernc.org/memory/memory32.go
new file mode 100644
index 00000000..f13a8ae6
--- /dev/null
+++ b/vendor/modernc.org/memory/memory32.go
@@ -0,0 +1,9 @@
+// Copyright 2018 The Memory Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// +build 386 arm armbe mips mipsle ppc ppc64le s390 s390x sparc
+
+package memory // import "modernc.org/memory"
+
+type rawmem [1<<31 - 1]byte
diff --git a/vendor/modernc.org/memory/memory64.go b/vendor/modernc.org/memory/memory64.go
new file mode 100644
index 00000000..2c7cfee1
--- /dev/null
+++ b/vendor/modernc.org/memory/memory64.go
@@ -0,0 +1,9 @@
+// Copyright 2018 The Memory Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// +build amd64 amd64p32 arm64 arm64be mips64 mips64le mips64p32 mips64p32le ppc64 sparc64
+
+package memory // import "modernc.org/memory"
+
+type rawmem [1<<50 - 1]byte
diff --git a/vendor/modernc.org/memory/mmap_unix.go b/vendor/modernc.org/memory/mmap_unix.go
new file mode 100644
index 00000000..8fee87e6
--- /dev/null
+++ b/vendor/modernc.org/memory/mmap_unix.go
@@ -0,0 +1,69 @@
+// Copyright 2011 Evan Shaw. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE-MMAP-GO file.
+
+// +build darwin dragonfly freebsd linux openbsd solaris netbsd
+
+// Modifications (c) 2017 The Memory Authors.
+
+package memory // import "modernc.org/memory"
+
+import (
+	"os"
+	"syscall"
+	"unsafe"
+)
+
+const pageSizeLog = 20
+
+var (
+	osPageMask = osPageSize - 1
+	osPageSize = os.Getpagesize()
+)
+
+func unmap(addr uintptr, size int) error {
+	_, _, errno := syscall.Syscall(syscall.SYS_MUNMAP, addr, uintptr(size), 0)
+	if errno != 0 {
+		return errno
+	}
+
+	return nil
+}
+
+// pageSize aligned.
+func mmap(size int) (uintptr, int, error) {
+	size = roundup(size, osPageSize)
+	b, err := syscall.Mmap(-1, 0, size+pageSize, syscall.PROT_READ|syscall.PROT_WRITE, syscall.MAP_SHARED|syscall.MAP_ANON)
+	if err != nil {
+		return 0, 0, err
+	}
+
+	n := len(b)
+	p := uintptr(unsafe.Pointer(&b[0]))
+	if p&uintptr(osPageMask) != 0 {
+		panic("internal error")
+	}
+
+	mod := int(p) & pageMask
+	if mod != 0 {
+		m := pageSize - mod
+		if err := unmap(p, m); err != nil {
+			return 0, 0, err
+		}
+
+		n -= m
+		p += uintptr(m)
+	}
+
+	if p&uintptr(pageMask) != 0 {
+		panic("internal error")
+	}
+
+	if n-size != 0 {
+		if err := unmap(p+uintptr(size), n-size); err != nil {
+			return 0, 0, err
+		}
+	}
+
+	return p, size, nil
+}
diff --git a/vendor/modernc.org/memory/mmap_windows.go b/vendor/modernc.org/memory/mmap_windows.go
new file mode 100644
index 00000000..3c402039
--- /dev/null
+++ b/vendor/modernc.org/memory/mmap_windows.go
@@ -0,0 +1,49 @@
+// Copyright 2017 The Memory 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 memory // import "modernc.org/memory"
+
+import (
+	"os"
+	"syscall"
+)
+
+const (
+	_MEM_COMMIT   = 0x1000
+	_MEM_RESERVE  = 0x2000
+	_MEM_DECOMMIT = 0x4000
+	_MEM_RELEASE  = 0x8000
+
+	_PAGE_READWRITE = 0x0004
+	_PAGE_NOACCESS  = 0x0001
+)
+
+const pageSizeLog = 16
+
+var (
+	modkernel32      = syscall.NewLazyDLL("kernel32.dll")
+	osPageMask       = osPageSize - 1
+	osPageSize       = os.Getpagesize()
+	procVirtualAlloc = modkernel32.NewProc("VirtualAlloc")
+	procVirtualFree  = modkernel32.NewProc("VirtualFree")
+)
+
+// pageSize aligned.
+func mmap(size int) (uintptr, int, error) {
+	size = roundup(size, pageSize)
+	addr, _, err := procVirtualAlloc.Call(0, uintptr(size), _MEM_COMMIT|_MEM_RESERVE, _PAGE_READWRITE)
+	if err.(syscall.Errno) != 0 || addr == 0 {
+		return addr, size, err
+	}
+	return addr, size, nil
+}
+
+func unmap(addr uintptr, size int) error {
+	r, _, err := procVirtualFree.Call(addr, 0, _MEM_RELEASE)
+	if r == 0 {
+		return err
+	}
+
+	return nil
+}
diff --git a/vendor/modernc.org/memory/nocounters.go b/vendor/modernc.org/memory/nocounters.go
new file mode 100644
index 00000000..40af6a9a
--- /dev/null
+++ b/vendor/modernc.org/memory/nocounters.go
@@ -0,0 +1,9 @@
+// Copyright 2017 The Memory Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// +build !memory.counters
+
+package memory // import "modernc.org/memory"
+
+const counters = false
diff --git a/vendor/modernc.org/memory/trace_disabled.go b/vendor/modernc.org/memory/trace_disabled.go
new file mode 100644
index 00000000..76e60766
--- /dev/null
+++ b/vendor/modernc.org/memory/trace_disabled.go
@@ -0,0 +1,9 @@
+// Copyright 2017 The Memory Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// +build !memory.trace
+
+package memory // import "modernc.org/memory"
+
+const trace = false
diff --git a/vendor/modernc.org/memory/trace_enabled.go b/vendor/modernc.org/memory/trace_enabled.go
new file mode 100644
index 00000000..55e65f4a
--- /dev/null
+++ b/vendor/modernc.org/memory/trace_enabled.go
@@ -0,0 +1,9 @@
+// Copyright 2017 The Memory Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// +build memory.trace
+
+package memory // import "modernc.org/memory"
+
+const trace = true