Add dependencies/vendor (whatsapp)

1 files changed, 553 insertions, 0 deletions

diff --git a/vendor/modernc.org/ccgo/v3/lib/init.go b/vendor/modernc.org/ccgo/v3/lib/init.go
new file mode 100644
index 00000000..db3ad913
--- /dev/null
+++ b/vendor/modernc.org/ccgo/v3/lib/init.go
@@ -0,0 +1,553 @@
+// Copyright 2020 The CCGO 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 ccgo // import "modernc.org/ccgo/v3/lib"
+
+import (
+	"fmt"
+	"sort"
+	"strings"
+
+	"modernc.org/cc/v3"
+)
+
+func isAggregateTypeOrUnion(t cc.Type) bool {
+	switch t.Kind() {
+	case cc.Struct, cc.Union, cc.Array:
+		return true
+	}
+
+	return false
+}
+
+// 6.7.8 Initialization
+func (p *project) initializer(f *function, n *cc.Initializer, t cc.Type, sc cc.StorageClass, tld *tld) {
+	lm := map[*cc.Initializer][]cc.StringID{}
+	tm := map[*cc.Initializer][]cc.StringID{}
+	s := p.initializerFlatten(n, lm, tm)
+	sort.Slice(s, func(i, j int) bool {
+		a := s[i]
+		b := s[j]
+		if a.Offset < b.Offset {
+			return true
+		}
+
+		if a.Offset > b.Offset {
+			return false
+		}
+
+		if a.Field == nil || b.Field == nil || !a.Field.IsBitField() || !b.Field.IsBitField() {
+			panic(todo("%v: internal error: off %#x, %v: off %#x, t %v", a.Position(), a.Offset, b.Position(), b.Offset, t))
+		}
+
+		return a.Field.BitFieldOffset() < b.Field.BitFieldOffset()
+	})
+	p.initializerInner("", 0, f, s, t, sc, tld, nil, lm, tm)
+}
+
+func (p *project) initializerInner(tag string, off uintptr, f *function, s []*cc.Initializer, t cc.Type, sc cc.StorageClass, tld *tld, patchField cc.Field, lm, tm map[*cc.Initializer][]cc.StringID) {
+	// 11: The initializer for a scalar shall be a single expression, optionally
+	// enclosed in braces. The initial value of the object is that of the
+	// expression (after conversion); the same type constraints and conversions as
+	// for simple assignment apply, taking the type of the scalar to be the
+	// unqualified version of its declared type.
+	if t.IsScalarType() && len(s) == 1 {
+		p.w("%s%s", tidyComment("", s[0]), tag)
+		switch {
+		case tld != nil && t.Kind() == cc.Ptr && s[0].AssignmentExpression.Operand.Value() == nil:
+			tld.patches = append(tld.patches, initPatch{t, s[0], patchField})
+			p.w(" 0 ")
+		default:
+			p.assignmentExpression(f, s[0].AssignmentExpression, t, exprValue, 0)
+		}
+		return
+	}
+
+	// 12: The rest of this subclause deals with initializers for objects that have
+	// aggregate or union type.
+
+	k := t.Kind()
+
+	// 13: The initializer for a structure or union object that has automatic
+	// storage duration shall be either an initializer list as described below, or
+	// a single expression that has compatible structure or union type. In the
+	// latter case, the initial value of the object, including unnamed members, is
+	// that of the expression.
+	if sc == cc.Automatic && len(s) == 1 {
+		switch k {
+		case cc.Struct, cc.Union:
+			if compatibleStructOrUnion(t, s[0].AssignmentExpression.Operand.Type()) {
+				p.w("%s%s", tidyComment("", s[0]), tag)
+				p.assignmentExpression(f, s[0].AssignmentExpression, t, exprValue, 0)
+				return
+			}
+		}
+	}
+
+	if k == cc.Array && len(s) == 1 {
+		et := t.Elem()
+		switch {
+		case isCharType(et):
+			// 14: An array of character type may be initialized by a character string
+			// literal, optionally enclosed in braces. Successive characters of the
+			// character string literal (including the terminating null character if there
+			// is room or if the array is of unknown size) initialize the elements of the
+			// array.
+			if x, ok := s[0].AssignmentExpression.Operand.Value().(cc.StringValue); ok {
+				p.w("%s%s", tidyComment("", s[0]), tag)
+				str := cc.StringID(x).String()
+				slen := uintptr(len(str)) + 1
+				alen := t.Len()
+				switch {
+				case alen < slen-1:
+					p.w("*(*%s)(unsafe.Pointer(%s))", p.typ(s[0], t), p.stringLiteralString(str[:alen]))
+				case alen < slen:
+					p.w("*(*%s)(unsafe.Pointer(%s))", p.typ(s[0], t), p.stringLiteralString(str))
+				default: // alen >= slen
+					p.w("*(*%s)(unsafe.Pointer(%s))", p.typ(s[0], t), p.stringLiteralString(str+strings.Repeat("\x00", int(alen-slen))))
+				}
+				return
+			}
+		case p.isWCharType(et):
+			// 15: An array with element type compatible with wchar_t may be initialized by
+			// a wide string literal, optionally enclosed in braces. Successive wide
+			// characters of the wide string literal (including the terminating null wide
+			// character if there is room or if the array is of unknown size) initialize
+			// the elements of the array.
+			if x, ok := s[0].AssignmentExpression.Operand.Value().(cc.WideStringValue); ok {
+				p.w("%s%s", tidyComment("", s[0]), tag)
+				str := []rune(cc.StringID(x).String())
+				slen := uintptr(len(str)) + 1
+				alen := t.Len()
+				switch {
+				case alen < slen-1:
+					panic(todo("", p.pos(s[0])))
+				case alen < slen:
+					p.w("*(*%s)(unsafe.Pointer(%s))", p.typ(s[0], t), p.wideStringLiteral(x, 0))
+				default: // alen >= slen
+					p.w("*(*%s)(unsafe.Pointer(%s))", p.typ(s[0], t), p.wideStringLiteral(x, int(alen-slen)))
+				}
+				return
+			}
+		}
+	}
+
+	// 16: Otherwise, the initializer for an object that has aggregate or union
+	// type shall be a brace-enclosed list of initializers for the elements or
+	// named members.
+	switch k {
+	case cc.Array:
+		p.initializerArray(tag, off, f, s, t, sc, tld, lm, tm)
+	case cc.Struct:
+		p.initializerStruct(tag, off, f, s, t, sc, tld, lm, tm)
+	case cc.Union:
+		p.initializerUnion(tag, off, f, s, t, sc, tld, lm, tm)
+	default:
+		panic(todo("%v: internal error: %v alias %v %v", s[0].Position(), t, t.Alias(), len(s)))
+	}
+}
+
+func (p *project) initializerArray(tag string, off uintptr, f *function, s []*cc.Initializer, t cc.Type, sc cc.StorageClass, tld *tld, lm, tm map[*cc.Initializer][]cc.StringID) {
+	if len(s) == 0 {
+		p.w("%s%s{}", tag, p.typ(nil, t))
+		return
+	}
+
+	et := t.Elem()
+	esz := et.Size()
+	s0 := s[0]
+	p.w("%s%s%s{", initComment(s0, lm), tag, p.typ(s0, t))
+	var a [][]*cc.Initializer
+	for len(s) != 0 {
+		s2, parts, _ := p.initializerArrayElement(off, s, esz)
+		s = s2
+		a = append(a, parts)
+	}
+	mustIndex := uintptr(len(a)) != t.Len()
+	var parts []*cc.Initializer
+	for _, parts = range a {
+		var comma *cc.Token
+		comma = parts[len(parts)-1].TrailingComma()
+		elemOff := (parts[0].Offset - off) / esz * esz
+		tag = ""
+		if mustIndex {
+			tag = fmt.Sprintf("%d:", elemOff/esz)
+		}
+		p.initializerInner(tag, off+elemOff, f, parts, et, sc, tld, nil, lm, tm)
+		p.preCommaSep(comma)
+		p.w(",")
+	}
+	p.w("%s}", initComment(parts[len(parts)-1], tm))
+}
+
+func initComment(n *cc.Initializer, m map[*cc.Initializer][]cc.StringID) string {
+	a := m[n]
+	if len(a) == 0 {
+		return ""
+	}
+
+	m[n] = a[1:]
+	return tidyCommentString(a[0].String())
+}
+
+func (p *project) initializerArrayElement(off uintptr, s []*cc.Initializer, elemSize uintptr) (r []*cc.Initializer, parts []*cc.Initializer, isZero bool) {
+	r = s
+	isZero = true
+	valueOff := s[0].Offset - off
+	elemOff := valueOff - valueOff%elemSize
+	nextOff := elemOff + elemSize
+	for len(s) != 0 {
+		if v := s[0]; v.Offset-off < nextOff {
+			s = s[1:]
+			parts = append(parts, v)
+			if !v.AssignmentExpression.Operand.IsZero() {
+				isZero = false
+			}
+			continue
+		}
+
+		break
+	}
+	return r[len(parts):], parts, isZero
+}
+
+func (p *project) initializerStruct(tag string, off uintptr, f *function, s []*cc.Initializer, t cc.Type, sc cc.StorageClass, tld *tld, lm, tm map[*cc.Initializer][]cc.StringID) {
+	if len(s) == 0 {
+		p.w("%s%s{}", tag, p.typ(nil, t))
+		return
+	}
+
+	if t.HasFlexibleMember() {
+		p.err(s[0], "flexible array members not supported")
+		return
+	}
+
+	p.w("%s%s%s{", initComment(s[0], lm), tag, p.typ(s[0], t))
+	var parts []*cc.Initializer
+	var isZero bool
+	var fld cc.Field
+	for len(s) != 0 {
+		var comma *cc.Token
+		s, fld, parts, isZero = p.structInitializerParts(off, s, t)
+		if isZero {
+			continue
+		}
+
+		if fld.Type().IsIncomplete() {
+			panic(todo(""))
+		}
+
+		comma = parts[len(parts)-1].TrailingComma()
+		tag = fmt.Sprintf("%s:", p.fieldName2(parts[0], fld))
+		ft := fld.Type()
+		switch {
+		case fld.IsBitField():
+			bft := p.bitFileType(parts[0], fld.BitFieldBlockWidth())
+			off0 := fld.Offset()
+			first := true
+			for _, v := range parts {
+				if v.AssignmentExpression.Operand.IsZero() {
+					continue
+				}
+
+				if !first {
+					p.w("|")
+				}
+				first = false
+				bitFld := v.Field
+				p.w("%s%s", tidyComment("", v.AssignmentExpression), tag)
+				tag = ""
+				p.assignmentExpression(f, v.AssignmentExpression, bft, exprValue, 0)
+				p.w("&%#x", uint64(1)<<uint64(bitFld.BitFieldWidth())-1)
+				if o := bitFld.BitFieldOffset() + 8*int((bitFld.Offset()-off0)); o != 0 {
+					p.w("<<%d", o)
+				}
+			}
+		default:
+			p.initializerInner(tag, off+fld.Offset(), f, parts, ft, sc, tld, fld, lm, tm)
+		}
+		p.preCommaSep(comma)
+		p.w(",")
+	}
+	p.w("%s}", initComment(parts[len(parts)-1], tm))
+}
+
+func (p *project) preCommaSep(comma *cc.Token) {
+	if comma == nil {
+		return
+	}
+
+	p.w("%s", strings.TrimSpace(comma.Sep.String()))
+}
+
+func (p *project) structInitializerParts(off uintptr, s []*cc.Initializer, t cc.Type) (r []*cc.Initializer, fld cc.Field, parts []*cc.Initializer, isZero bool) {
+	if len(s) == 0 {
+		return nil, nil, nil, true
+	}
+
+	part := s[0]
+	isZero = part.AssignmentExpression.Operand.IsZero()
+	parts = append(parts, part)
+	s = s[1:]
+	fld, _, fNext := p.containingStructField(part, off, t)
+	for len(s) != 0 {
+		part = s[0]
+		vOff := part.Offset
+		if vOff >= fNext {
+			break
+		}
+
+		isZero = isZero && part.AssignmentExpression.Operand.IsZero()
+		parts = append(parts, part)
+		s = s[1:]
+	}
+	return s, fld, parts, isZero
+}
+
+func (p *project) containingStructField(part *cc.Initializer, off uintptr, t cc.Type) (f cc.Field, fOff, fNext uintptr) {
+	nf := t.NumField()
+	vOff := part.Offset
+	for i := []int{0}; i[0] < nf; i[0]++ {
+		f = t.FieldByIndex(i)
+		if f.IsBitField() && f.Name() == 0 { // Anonymous bit fields cannot be initialized.
+			continue
+		}
+
+		fOff = off + f.Offset()
+		switch {
+		case f.IsBitField():
+			fNext = fOff + uintptr(f.BitFieldBlockWidth())>>3
+		default:
+			fNext = fOff + f.Type().Size()
+		}
+		if vOff >= fOff && vOff < fNext {
+			return f, fOff, fNext
+		}
+	}
+
+	panic(todo("%v: internal error", pos(part)))
+}
+
+func (p *project) initializerUnion(tag string, off uintptr, f *function, s []*cc.Initializer, t cc.Type, sc cc.StorageClass, tld *tld, lm, tm map[*cc.Initializer][]cc.StringID) {
+	if len(s) == 0 {
+		p.w("%s%s{}", tag, p.typ(nil, t))
+		return
+	}
+
+	if t.HasFlexibleMember() {
+		p.err(s[0], "flexible array members not supported")
+		return
+	}
+
+	parts, isZero := p.initializerUnionField(off, s, t)
+	if len(parts) == 0 || isZero {
+		p.w("%s%s%s{", initComment(s[0], lm), tag, p.typ(s[0], t))
+		p.w("%s}", initComment(parts[len(parts)-1], tm))
+		return
+	}
+
+	p.w("%sfunc() (r %s) {", tag, p.typ(parts[0], t))
+	for _, part := range parts {
+		var ft cc.Type
+		fld := part.Field
+		if fld != nil && fld.IsBitField() {
+		}
+
+		if ft == nil {
+			ft = part.Type()
+		}
+		if ft.Kind() == cc.Array {
+			et := ft.Elem()
+			switch {
+			case isCharType(et):
+				switch x := part.AssignmentExpression.Operand.Value().(type) {
+				case cc.StringValue:
+					str := cc.StringID(x).String()
+					slen := uintptr(len(str)) + 1
+					alen := ft.Len()
+					switch {
+					case alen < slen-1:
+						p.w("copy(((*[%d]byte)(unsafe.Pointer(uintptr(unsafe.Pointer(&r))+%d)))[:], (*[%d]byte)(unsafe.Pointer(%s))[:])\n", alen, part.Offset-off, alen, p.stringLiteralString(str[:alen]))
+					case alen < slen:
+						p.w("copy(((*[%d]byte)(unsafe.Pointer(uintptr(unsafe.Pointer(&r))+%d)))[:], (*[%d]byte)(unsafe.Pointer(%s))[:])\n", alen, part.Offset-off, alen, p.stringLiteralString(str))
+					default: // alen >= slen
+						p.w("copy(((*[%d]byte)(unsafe.Pointer(uintptr(unsafe.Pointer(&r))+%d)))[:], (*[%d]byte)(unsafe.Pointer(%s))[:])\n", alen, part.Offset-off, alen, p.stringLiteralString(str+strings.Repeat("\x00", int(alen-slen))))
+					}
+					continue
+				default:
+					panic(todo("%v: %v <- %T", pos(part), et, x))
+				}
+			case p.isWCharType(et):
+				panic(todo(""))
+			}
+			ft = et
+		}
+		switch {
+		case fld != nil && fld.IsBitField():
+			bft := p.bitFileType(part, fld.BitFieldBlockWidth())
+			p.w("*(*%s)(unsafe.Pointer(uintptr(unsafe.Pointer(&r))+%d)) |= ", p.typ(part, bft), part.Offset-off)
+			p.assignmentExpression(f, part.AssignmentExpression, bft, exprValue, 0)
+			p.w("&%#x", uint64(1)<<uint64(fld.BitFieldWidth())-1)
+			if o := fld.BitFieldOffset(); o != 0 {
+				p.w("<<%d", o)
+			}
+		default:
+			p.w("*(*%s)(unsafe.Pointer(uintptr(unsafe.Pointer(&r))+%d)) = ", p.typ(part, ft), part.Offset-off)
+			p.assignmentExpression(f, part.AssignmentExpression, ft, exprValue, 0)
+		}
+		p.w("\n")
+	}
+	p.w("return r\n")
+	p.w("}()")
+}
+
+func (p *project) initializerUnionField(off uintptr, s []*cc.Initializer, t cc.Type) (parts []*cc.Initializer, isZero bool) {
+	isZero = true
+	nextOff := off + t.Size()
+	for len(s) != 0 {
+		if v := s[0]; v.Offset < nextOff {
+			s = s[1:]
+			parts = append(parts, v)
+			isZero = isZero && v.AssignmentExpression.Operand.IsZero()
+			continue
+		}
+
+		break
+	}
+	return parts, isZero
+}
+
+func compatibleStructOrUnion(t1, t2 cc.Type) bool {
+	switch t1.Kind() {
+	case cc.Struct:
+		if t2.Kind() != cc.Struct {
+			return false
+		}
+	case cc.Union:
+		if t2.Kind() != cc.Union {
+			return false
+		}
+	default:
+		return false
+	}
+
+	if tag := t1.Tag(); tag != 0 && t2.Tag() != tag {
+		return false
+	}
+
+	nf := t1.NumField()
+	if t2.NumField() != nf {
+		return false
+	}
+
+	for i := []int{0}; i[0] < nf; i[0]++ {
+		f1 := t1.FieldByIndex(i)
+		f2 := t2.FieldByIndex(i)
+		nm := f1.Name()
+		if f2.Name() != nm {
+			return false
+		}
+
+		ft1 := f1.Type()
+		ft2 := f2.Type()
+		if ft1.Size() != ft2.Size() ||
+			f1.IsBitField() != f2.IsBitField() ||
+			f1.BitFieldOffset() != f2.BitFieldOffset() ||
+			f1.BitFieldWidth() != f2.BitFieldWidth() {
+			return false
+		}
+
+		if !compatibleType(ft1, ft2) {
+			return false
+		}
+	}
+	return true
+}
+
+func compatibleType(t1, t2 cc.Type) bool {
+	if t1.Kind() != t2.Kind() {
+		return false
+	}
+
+	switch t1.Kind() {
+	case cc.Array:
+		if t1.Len() != t2.Len() || !compatibleType(t1.Elem(), t2.Elem()) {
+			return false
+		}
+	case cc.Struct, cc.Union:
+		if !compatibleStructOrUnion(t1, t2) {
+			return false
+		}
+	}
+	return true
+}
+
+func (p *project) bitFileType(n cc.Node, bits int) cc.Type {
+	switch bits {
+	case 8:
+		return p.task.cfg.ABI.Type(cc.UChar)
+	case 16:
+		return p.task.cfg.ABI.Type(cc.UShort)
+	case 32:
+		return p.task.cfg.ABI.Type(cc.UInt)
+	case 64:
+		return p.task.cfg.ABI.Type(cc.ULongLong)
+	default:
+		panic(todo("%v: internal error: %v", n.Position(), bits))
+	}
+}
+
+func (p *project) isWCharType(t cc.Type) bool {
+	if t.IsAliasType() {
+		if id := t.AliasDeclarator().Name(); id == idWcharT ||
+			p.task.goos == "windows" && id == idWinWchar {
+			return true
+		}
+	}
+
+	return false
+}
+
+func isCharType(t cc.Type) bool {
+	switch t.Kind() {
+	case cc.Char, cc.SChar, cc.UChar:
+		return true
+	}
+
+	return false
+}
+
+func (p *project) initializerFlatten(n *cc.Initializer, lm, tm map[*cc.Initializer][]cc.StringID) (s []*cc.Initializer) {
+	switch n.Case {
+	case cc.InitializerExpr: // AssignmentExpression
+		return append(s, n)
+	case cc.InitializerInitList: // '{' InitializerList ',' '}'
+		first := true
+		for list := n.InitializerList; list != nil; list = list.InitializerList {
+			in := list.Initializer
+			k := in
+			if in.Case != cc.InitializerExpr {
+				k = nil
+			}
+			if first {
+				lm[k] = append(lm[k], append(lm[nil], n.Token.Sep)...)
+				if k != nil {
+					delete(lm, nil)
+				}
+				first = false
+			}
+			if list.InitializerList == nil {
+				tm[k] = append([]cc.StringID{n.Token3.Sep}, append(tm[nil], tm[k]...)...)
+				tm[k] = append(tm[k], append(tm[nil], n.Token3.Sep)...)
+				if k != nil {
+					delete(tm, nil)
+				}
+			}
+			s = append(s, p.initializerFlatten(in, lm, tm)...)
+		}
+		return s
+	default:
+		panic(todo("%v: internal error: %v", n.Position(), n.Case))
+	}
+}