Add dependencies/vendor (whatsapp)

1 files changed, 1187 insertions, 0 deletions

diff --git a/vendor/modernc.org/cc/v3/ast2.go b/vendor/modernc.org/cc/v3/ast2.go
new file mode 100644
index 00000000..13ed6130
--- /dev/null
+++ b/vendor/modernc.org/cc/v3/ast2.go
@@ -0,0 +1,1187 @@
+// Copyright 2019 The CC 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 cc // import "modernc.org/cc/v3"
+
+import (
+	"fmt"
+	"io"
+	"os"
+	"path/filepath"
+	"sort"
+	"strings"
+)
+
+// Source is a named part of a translation unit. If Value is empty, Name is
+// interpreted as a path to file containing the source code.
+type Source struct {
+	Name       string
+	Value      string
+	DoNotCache bool // Disable caching of this source
+}
+
+// Promote returns the type the operands of a binary operation are promoted to
+// or the type and argument passed in a function call is promoted.
+func (n *AssignmentExpression) Promote() Type { return n.promote }
+
+type StructInfo struct {
+	Size uintptr
+
+	Align int
+}
+
+// AST represents a translation unit and its related data.
+type AST struct {
+	Enums       map[StringID]Operand // Enumeration constants declared in file scope.
+	Macros      map[StringID]*Macro  // Macros as defined after parsing.
+	PtrdiffType Type
+	Scope       Scope // File scope.
+	SizeType    Type
+	StructTypes map[StringID]Type // Tagged struct/union types declared in file scope.
+	// Alignment and size of every struct/union defined in the translation
+	// unit. Valid only after Translate.
+	Structs map[StructInfo]struct{}
+	// TLD contains pruned file scope declarators, ie. either the first one
+	// or the first one that has an initializer.
+	TLD               map[*Declarator]struct{}
+	TrailingSeperator StringID // White space and/or comments preceding EOF.
+	TranslationUnit   *TranslationUnit
+	WideCharType      Type
+	cfg               *Config
+	cpp               *cpp
+}
+
+// Eval returns the operand that represents the value of m, if it expands to a
+// valid constant expression other than an identifier, or an error, if any.
+func (n *AST) Eval(m *Macro) (o Operand, err error) {
+	defer func() {
+		if e := recover(); e != nil {
+			o = nil
+			err = fmt.Errorf("%v", e)
+		}
+	}()
+
+	if m.IsFnLike() {
+		return nil, fmt.Errorf("cannot evaluate function-like macro")
+	}
+
+	n.cpp.ctx.cfg.ignoreErrors = true
+	n.cpp.ctx.evalIdentError = true
+	v := n.cpp.eval(m.repl)
+	switch x := v.(type) {
+	case int64:
+		return &operand{abi: &n.cfg.ABI, typ: n.cfg.ABI.Type(LongLong), value: Int64Value(x)}, nil
+	case uint64:
+		return &operand{abi: &n.cfg.ABI, typ: n.cfg.ABI.Type(ULongLong), value: Uint64Value(x)}, nil
+	default:
+		return nil, fmt.Errorf("unexpected value: %T", x)
+	}
+}
+
+// Parse preprocesses and parses a translation unit and returns an *AST or
+// error, if any.
+//
+// Search paths listed in includePaths and sysIncludePaths are used to resolve
+// #include "foo.h" and #include <foo.h> preprocessing directives respectively.
+// A special search path "@" is interpreted as 'the same directory as where the
+// file with the #include directive is'.
+//
+// The sources should typically provide, usually in this particular order:
+//
+// - predefined macros, eg.
+//
+//	#define __SIZE_TYPE__ long unsigned int
+//
+// - built-in declarations, eg.
+//
+//	int __builtin_printf(char *__format, ...);
+//
+// - command-line provided directives, eg.
+//
+//	#define FOO
+//	#define BAR 42
+//	#undef QUX
+//
+// - normal C sources, eg.
+//
+//	int main() {}
+//
+// All search and file paths should be absolute paths.
+//
+// If the preprocessed translation unit is empty, the function may return (nil,
+// nil).
+//
+// The parser does only the minimum declarations/identifier resolving necessary
+// for correct parsing. Redeclarations are not checked.
+//
+// Declarators (*Declarator) and StructDeclarators (*StructDeclarator) are
+// inserted in the appropriate scopes.
+//
+// Tagged struct/union specifier definitions (*StructOrUnionSpecifier) are
+// inserted in the appropriate scopes.
+//
+// Tagged enum specifier definitions (*EnumSpecifier) and enumeration constants
+// (*Enumerator) are inserted in the appropriate scopes.
+//
+// Labels (*LabeledStatement) are inserted in the appropriate scopes.
+func Parse(cfg *Config, includePaths, sysIncludePaths []string, sources []Source) (*AST, error) {
+	return parse(newContext(cfg), includePaths, sysIncludePaths, sources)
+}
+
+func parse(ctx *context, includePaths, sysIncludePaths []string, sources []Source) (*AST, error) {
+	if s := ctx.cfg.SharedFunctionDefinitions; s != nil {
+		if s.M == nil {
+			s.M = map[*FunctionDefinition]struct{}{}
+		}
+		if s.m == nil {
+			s.m = map[sharedFunctionDefinitionKey]*FunctionDefinition{}
+		}
+	}
+	if debugWorkingDir || ctx.cfg.DebugWorkingDir {
+		switch wd, err := os.Getwd(); err {
+		case nil:
+			fmt.Fprintf(os.Stderr, "OS working dir: %s\n", wd)
+		default:
+			fmt.Fprintf(os.Stderr, "OS working dir: error %s\n", err)
+		}
+		fmt.Fprintf(os.Stderr, "Config.WorkingDir: %s\n", ctx.cfg.WorkingDir)
+	}
+	if debugIncludePaths || ctx.cfg.DebugIncludePaths {
+		fmt.Fprintf(os.Stderr, "include paths: %v\n", includePaths)
+		fmt.Fprintf(os.Stderr, "system include paths: %v\n", sysIncludePaths)
+	}
+	ctx.includePaths = includePaths
+	ctx.sysIncludePaths = sysIncludePaths
+	var in []source
+	for _, v := range sources {
+		ts, err := cache.get(ctx, v)
+		if err != nil {
+			return nil, err
+		}
+
+		in = append(in, ts)
+	}
+
+	p := newParser(ctx, make(chan *[]Token, 5000)) //DONE benchmark tuned
+	var sep StringID
+	var ssep []byte
+	var seq int32
+	cpp := newCPP(ctx)
+	go func() {
+
+		defer func() {
+			close(p.in)
+			ctx.intMaxWidth = cpp.intMaxWidth()
+		}()
+
+		toks := tokenPool.Get().(*[]Token)
+		*toks = (*toks)[:0]
+		for pline := range cpp.translationPhase4(in) {
+			line := *pline
+			for _, tok := range line {
+				switch tok.char {
+				case ' ', '\n':
+					if ctx.cfg.PreserveOnlyLastNonBlankSeparator {
+						if strings.TrimSpace(tok.value.String()) != "" {
+							sep = tok.value
+						}
+						break
+					}
+
+					switch {
+					case sep != 0:
+						ssep = append(ssep, tok.String()...)
+					default:
+						sep = tok.value
+						ssep = append(ssep[:0], sep.String()...)
+					}
+				default:
+					var t Token
+					t.Rune = tok.char
+					switch {
+					case len(ssep) != 0:
+						t.Sep = dict.id(ssep)
+					default:
+						t.Sep = sep
+					}
+					t.Value = tok.value
+					t.Src = tok.src
+					t.file = tok.file
+					t.macro = tok.macro
+					t.pos = tok.pos
+					seq++
+					t.seq = seq
+					*toks = append(*toks, t)
+					sep = 0
+					ssep = ssep[:0]
+				}
+			}
+			token4Pool.Put(pline)
+			var c rune
+			if n := len(*toks); n != 0 {
+				c = (*toks)[n-1].Rune
+			}
+			switch c {
+			case STRINGLITERAL, LONGSTRINGLITERAL:
+				// nop
+			default:
+				if len(*toks) != 0 {
+					p.in <- translationPhase5(ctx, toks)
+					toks = tokenPool.Get().(*[]Token)
+					*toks = (*toks)[:0]
+				}
+			}
+		}
+		if len(*toks) != 0 {
+			p.in <- translationPhase5(ctx, toks)
+		}
+	}()
+
+	tu := p.translationUnit()
+	if p.errored { // Must drain
+		go func() {
+			for range p.in {
+			}
+		}()
+	}
+
+	if err := ctx.Err(); err != nil {
+		return nil, err
+	}
+
+	if p.errored && !ctx.cfg.ignoreErrors {
+		return nil, fmt.Errorf("%v: syntax error", p.tok.Position())
+	}
+
+	if p.scopes != 0 {
+		panic(internalErrorf("invalid scope nesting but no error reported"))
+	}
+
+	ts := sep
+	if len(ssep) != 0 {
+		ts = dict.id(ssep)
+	}
+	return &AST{
+		Macros:            cpp.macros,
+		Scope:             p.fileScope,
+		TLD:               map[*Declarator]struct{}{},
+		TrailingSeperator: ts,
+		TranslationUnit:   tu,
+		cfg:               ctx.cfg,
+		cpp:               cpp,
+	}, nil
+}
+
+func translationPhase5(ctx *context, toks *[]Token) *[]Token {
+	// [0], 5.1.1.2, 5
+	//
+	// Each source character set member and escape sequence in character
+	// constants and string literals is converted to the corresponding
+	// member of the execution character set; if there is no corresponding
+	// member, it is converted to an implementation- defined member other
+	// than the null (wide) character.
+	for i, tok := range *toks {
+		var cpt cppToken
+		switch tok.Rune {
+		case STRINGLITERAL, LONGSTRINGLITERAL:
+			cpt.char = tok.Rune
+			cpt.value = tok.Value
+			cpt.src = tok.Src
+			cpt.file = tok.file
+			cpt.pos = tok.pos
+			(*toks)[i].Value = dict.sid(stringConst(ctx, cpt))
+		case CHARCONST, LONGCHARCONST:
+			var cpt cppToken
+			cpt.char = tok.Rune
+			cpt.value = tok.Value
+			cpt.src = tok.Src
+			cpt.file = tok.file
+			cpt.pos = tok.pos
+			switch r := charConst(ctx, cpt); {
+			case r <= 255:
+				(*toks)[i].Value = dict.sid(string(r))
+			default:
+				switch cpt.char {
+				case CHARCONST:
+					ctx.err(tok.Position(), "invalid character constant: %s", tok.Value)
+				default:
+					(*toks)[i].Value = dict.sid(string(r))
+				}
+			}
+		}
+	}
+	return toks
+}
+
+// Preprocess preprocesses a translation unit and outputs the result to w.
+//
+// Please see Parse for the documentation of the other parameters.
+func Preprocess(cfg *Config, includePaths, sysIncludePaths []string, sources []Source, w io.Writer) error {
+	ctx := newContext(cfg)
+	if debugWorkingDir || ctx.cfg.DebugWorkingDir {
+		switch wd, err := os.Getwd(); err {
+		case nil:
+			fmt.Fprintf(os.Stderr, "OS working dir: %s\n", wd)
+		default:
+			fmt.Fprintf(os.Stderr, "OS working dir: error %s\n", err)
+		}
+		fmt.Fprintf(os.Stderr, "Config.WorkingDir: %s\n", ctx.cfg.WorkingDir)
+	}
+	if debugIncludePaths || ctx.cfg.DebugIncludePaths {
+		fmt.Fprintf(os.Stderr, "include paths: %v\n", includePaths)
+		fmt.Fprintf(os.Stderr, "system include paths: %v\n", sysIncludePaths)
+	}
+	ctx.includePaths = includePaths
+	ctx.sysIncludePaths = sysIncludePaths
+	var in []source
+	for _, v := range sources {
+		ts, err := cache.get(ctx, v)
+		if err != nil {
+			return err
+		}
+
+		in = append(in, ts)
+	}
+
+	var sep StringID
+	cpp := newCPP(ctx)
+	toks := tokenPool.Get().(*[]Token)
+	*toks = (*toks)[:0]
+	for pline := range cpp.translationPhase4(in) {
+		line := *pline
+		for _, tok := range line {
+			switch tok.char {
+			case ' ', '\n':
+				if ctx.cfg.PreserveOnlyLastNonBlankSeparator {
+					if strings.TrimSpace(tok.value.String()) != "" {
+						sep = tok.value
+					}
+					break
+				}
+
+				switch {
+				case sep != 0:
+					sep = dict.sid(sep.String() + tok.String())
+				default:
+					sep = tok.value
+				}
+			default:
+				var t Token
+				t.Rune = tok.char
+				t.Sep = sep
+				t.Value = tok.value
+				t.Src = tok.src
+				t.file = tok.file
+				t.pos = tok.pos
+				*toks = append(*toks, t)
+				sep = 0
+			}
+		}
+		token4Pool.Put(pline)
+		var c rune
+		if n := len(*toks); n != 0 {
+			c = (*toks)[n-1].Rune
+		}
+		switch c {
+		case STRINGLITERAL, LONGSTRINGLITERAL:
+			// nop
+		default:
+			if len(*toks) != 0 {
+				for _, v := range *translationPhase5(ctx, toks) {
+					if err := wTok(w, v); err != nil {
+						return err
+					}
+				}
+				toks = tokenPool.Get().(*[]Token)
+				*toks = (*toks)[:0]
+			}
+		}
+	}
+	if len(*toks) != 0 {
+		for _, v := range *translationPhase5(ctx, toks) {
+			if err := wTok(w, v); err != nil {
+				return err
+			}
+		}
+	}
+	if _, err := fmt.Fprintln(w); err != nil {
+		return err
+	}
+	return ctx.Err()
+}
+
+func wTok(w io.Writer, tok Token) (err error) {
+	switch tok.Rune {
+	case STRINGLITERAL, LONGSTRINGLITERAL:
+		_, err = fmt.Fprintf(w, `%s"%s"`, tok.Sep, cQuotedString(tok.String(), true))
+	case CHARCONST, LONGCHARCONST:
+		_, err = fmt.Fprintf(w, `%s'%s'`, tok.Sep, cQuotedString(tok.String(), false))
+	default:
+		_, err = fmt.Fprintf(w, "%s%s", tok.Sep, tok)
+	}
+	return err
+}
+
+func cQuotedString(s string, isString bool) []byte {
+	var b []byte
+	for i := 0; i < len(s); i++ {
+		c := s[i]
+		switch c {
+		case '\b':
+			b = append(b, '\\', 'b')
+			continue
+		case '\f':
+			b = append(b, '\\', 'f')
+			continue
+		case '\n':
+			b = append(b, '\\', 'n')
+			continue
+		case '\r':
+			b = append(b, '\\', 'r')
+			continue
+		case '\t':
+			b = append(b, '\\', 't')
+			continue
+		case '\\':
+			b = append(b, '\\', '\\')
+			continue
+		case '"':
+			switch {
+			case isString:
+				b = append(b, '\\', '"')
+			default:
+				b = append(b, '"')
+			}
+			continue
+		case '\'':
+			switch {
+			case isString:
+				b = append(b, '\'')
+			default:
+				b = append(b, '\\', '\'')
+			}
+			continue
+		}
+
+		switch {
+		case c < ' ' || c >= 0x7f:
+			b = append(b, '\\', octal(c>>6), octal(c>>3), octal(c))
+		default:
+			b = append(b, c)
+		}
+	}
+	return b
+}
+
+func octal(b byte) byte { return '0' + b&7 }
+
+var trcSource = Source{"<builtin-trc>", `
+extern void *stderr;
+int fflush(void *stream);
+int fprintf(void *stream, const char *format, ...);
+`, false}
+
+// Translate parses and typechecks a translation unit  and returns an *AST or
+// error, if any.
+//
+// Please see Parse for the documentation of the parameters.
+func Translate(cfg *Config, includePaths, sysIncludePaths []string, sources []Source) (*AST, error) {
+	if cfg.InjectTracingCode {
+		for i, v := range sources {
+			if filepath.Ext(v.Name) == ".c" {
+				sources = append(append(append([]Source(nil), sources[:i]...), trcSource), sources[i:]...)
+			}
+		}
+	}
+	return translate(newContext(cfg), includePaths, sysIncludePaths, sources)
+}
+
+func translate(ctx *context, includePaths, sysIncludePaths []string, sources []Source) (*AST, error) {
+	ast, err := parse(ctx, includePaths, sysIncludePaths, sources)
+	if err != nil {
+		return nil, err
+	}
+
+	if ctx, err = ast.typecheck(); err != nil {
+		return nil, err
+	}
+
+	ast.PtrdiffType = ptrdiffT(ctx, ast.Scope, Token{})
+	ast.SizeType = sizeT(ctx, ast.Scope, Token{})
+	ast.WideCharType = wcharT(ctx, ast.Scope, Token{})
+	return ast, nil
+}
+
+// Typecheck determines types of objects and expressions and verifies types are
+// valid in the context they are used.
+func (n *AST) Typecheck() error {
+	_, err := n.typecheck()
+	return err
+}
+
+func (n *AST) typecheck() (*context, error) {
+	ctx := newContext(n.cfg)
+	if err := ctx.cfg.ABI.sanityCheck(ctx, int(ctx.intMaxWidth), n.Scope); err != nil {
+		return nil, err
+	}
+
+	ctx.intBits = int(ctx.cfg.ABI.Types[Int].Size) * 8
+	ctx.ast = n
+	n.TranslationUnit.check(ctx)
+	n.Structs = ctx.structs
+	var a []int
+	for k := range n.Scope {
+		a = append(a, int(k))
+	}
+	sort.Ints(a)
+	for _, v := range a {
+		nm := StringID(v)
+		defs := n.Scope[nm]
+		var r, w int
+		for _, v := range defs {
+			switch x := v.(type) {
+			case *Declarator:
+				r += x.Read
+				w += x.Write
+			}
+		}
+		for _, v := range defs {
+			switch x := v.(type) {
+			case *Declarator:
+				x.Read = r
+				x.Write = w
+			}
+		}
+		var pruned *Declarator
+		for _, v := range defs {
+			switch x := v.(type) {
+			case *Declarator:
+				//TODO check compatible types
+				switch {
+				case x.IsExtern() && !x.fnDef:
+					// nop
+				case pruned == nil:
+					pruned = x
+				case pruned.hasInitializer && x.hasInitializer:
+					ctx.errNode(x, "multiple initializers for the same symbol")
+					continue
+				case pruned.fnDef && x.fnDef:
+					ctx.errNode(x, "multiple function definitions")
+					continue
+				case x.hasInitializer || x.fnDef:
+					pruned = x
+				}
+			}
+		}
+		if pruned == nil {
+			continue
+		}
+
+		n.TLD[pruned] = struct{}{}
+	}
+	n.Enums = ctx.enums
+	n.StructTypes = ctx.structTypes
+	return ctx, ctx.Err()
+}
+
+func (n *AlignmentSpecifier) align() int {
+	switch n.Case {
+	case AlignmentSpecifierAlignasType: // "_Alignas" '(' TypeName ')'
+		return n.TypeName.Type().Align()
+	case AlignmentSpecifierAlignasExpr: // "_Alignas" '(' ConstantExpression ')'
+		return n.ConstantExpression.Operand.Type().Align()
+	default:
+		panic(internalError())
+	}
+}
+
+// Closure reports the variables closed over by a nested function (case
+// BlockItemFuncDef).
+func (n *BlockItem) Closure() map[StringID]struct{} { return n.closure }
+
+// FunctionDefinition returns the nested function (case BlockItemFuncDef).
+func (n *BlockItem) FunctionDefinition() *FunctionDefinition { return n.fn }
+
+func (n *Declarator) IsStatic() bool { return n.td != nil && n.td.static() }
+
+// IsImplicit reports whether n was not declared nor defined, only inferred.
+func (n *Declarator) IsImplicit() bool { return n.implicit }
+
+func (n *Declarator) isVisible(at int32) bool { return at == 0 || n.DirectDeclarator.ends() < at }
+
+func (n *Declarator) setLHS(lhs *Declarator) {
+	if n == nil {
+		return
+	}
+
+	if n.lhs == nil {
+		n.lhs = map[*Declarator]struct{}{}
+	}
+	n.lhs[lhs] = struct{}{}
+}
+
+// LHS reports which declarators n is used in assignment RHS or which function
+// declarators n is used in a function argument. To collect this information,
+// TrackAssignments in Config must be set during type checking.
+// The returned map may contain a nil key. That means that n is assigned to a
+// declarator not known at typechecking time.
+func (n *Declarator) LHS() map[*Declarator]struct{} { return n.lhs }
+
+// Called reports whether n is involved in expr in expr(callArgs).
+func (n *Declarator) Called() bool { return n.called }
+
+// FunctionDefinition returns the function definition associated with n, if any.
+func (n *Declarator) FunctionDefinition() *FunctionDefinition {
+	return n.funcDefinition
+}
+
+// NameTok returns n's declaring name token.
+func (n *Declarator) NameTok() (r Token) {
+	if n == nil || n.DirectDeclarator == nil {
+		return r
+	}
+
+	return n.DirectDeclarator.NameTok()
+}
+
+// LexicalScope returns the lexical scope of n.
+func (n *Declarator) LexicalScope() Scope { return n.DirectDeclarator.lexicalScope }
+
+// Name returns n's declared name.
+func (n *Declarator) Name() StringID {
+	if n == nil || n.DirectDeclarator == nil {
+		return 0
+	}
+
+	return n.DirectDeclarator.Name()
+}
+
+// ParamScope returns the scope in which n's function parameters are declared
+// if the underlying type of n is a function or nil otherwise. If n is part of
+// a function definition the scope is the same as the scope of the function
+// body.
+func (n *Declarator) ParamScope() Scope {
+	if n == nil {
+		return nil
+	}
+
+	return n.DirectDeclarator.ParamScope()
+}
+
+// Type returns the type of n.
+func (n *Declarator) Type() Type { return n.typ }
+
+// IsExtern reports whether n was declared with storage class specifier 'extern'.
+func (n *Declarator) IsExtern() bool { return n.td != nil && n.td.extern() }
+
+func (n *DeclarationSpecifiers) auto() bool        { return n != nil && n.class&fAuto != 0 }
+func (n *DeclarationSpecifiers) extern() bool      { return n != nil && n.class&fExtern != 0 }
+func (n *DeclarationSpecifiers) register() bool    { return n != nil && n.class&fRegister != 0 }
+func (n *DeclarationSpecifiers) static() bool      { return n != nil && n.class&fStatic != 0 }
+func (n *DeclarationSpecifiers) threadLocal() bool { return n != nil && n.class&fThreadLocal != 0 }
+func (n *DeclarationSpecifiers) typedef() bool     { return n != nil && n.class&fTypedef != 0 }
+
+func (n *DirectAbstractDeclarator) TypeQualifier() Type { return n.typeQualifiers }
+
+func (n *DirectDeclarator) ends() int32 {
+	switch n.Case {
+	case DirectDeclaratorIdent: // IDENTIFIER
+		return n.Token.seq
+	case DirectDeclaratorDecl: // '(' Declarator ')'
+		return n.Token2.seq
+	case DirectDeclaratorArr: // DirectDeclarator '[' TypeQualifierList AssignmentExpression ']'
+		return n.Token2.seq
+	case DirectDeclaratorStaticArr: // DirectDeclarator '[' "static" TypeQualifierList AssignmentExpression ']'
+		return n.Token3.seq
+	case DirectDeclaratorArrStatic: // DirectDeclarator '[' TypeQualifierList "static" AssignmentExpression ']'
+		return n.Token3.seq
+	case DirectDeclaratorStar: // DirectDeclarator '[' TypeQualifierList '*' ']'
+		return n.Token3.seq
+	case DirectDeclaratorFuncParam: // DirectDeclarator '(' ParameterTypeList ')'
+		return n.Token2.seq
+	case DirectDeclaratorFuncIdent: // DirectDeclarator '(' IdentifierList ')'
+		return n.Token2.seq
+	default:
+		panic(internalError())
+	}
+}
+
+func (n *DirectDeclarator) TypeQualifier() Type { return n.typeQualifiers }
+
+// NameTok returns n's declarin name token.
+func (n *DirectDeclarator) NameTok() (r Token) {
+	for {
+		if n == nil {
+			return r
+		}
+
+		switch n.Case {
+		case DirectDeclaratorIdent: // IDENTIFIER
+			return n.Token
+		case DirectDeclaratorDecl: // '(' Declarator ')'
+			return n.Declarator.NameTok()
+		default:
+			n = n.DirectDeclarator
+		}
+	}
+}
+
+// Name returns n's declared name.
+func (n *DirectDeclarator) Name() StringID {
+	for {
+		if n == nil {
+			return 0
+		}
+
+		switch n.Case {
+		case DirectDeclaratorIdent: // IDENTIFIER
+			return n.Token.Value
+		case DirectDeclaratorDecl: // '(' Declarator ')'
+			return n.Declarator.Name()
+		default:
+			n = n.DirectDeclarator
+		}
+	}
+}
+
+// ParamScope returns the innermost scope in which function parameters are
+// declared for Case DirectDeclaratorFuncParam or DirectDeclaratorFuncIdent or
+// nil otherwise.
+func (n *DirectDeclarator) ParamScope() Scope {
+	if n == nil {
+		return nil
+	}
+
+	switch n.Case {
+	case DirectDeclaratorIdent: // IDENTIFIER
+		return nil
+	case DirectDeclaratorDecl: // '(' Declarator ')'
+		return n.Declarator.ParamScope()
+	case DirectDeclaratorArr: // DirectDeclarator '[' TypeQualifierList AssignmentExpression ']'
+		return n.DirectDeclarator.ParamScope()
+	case DirectDeclaratorStaticArr: // DirectDeclarator '[' "static" TypeQualifierList AssignmentExpression ']'
+		return n.DirectDeclarator.ParamScope()
+	case DirectDeclaratorArrStatic: // DirectDeclarator '[' TypeQualifierList "static" AssignmentExpression ']'
+		return n.DirectDeclarator.ParamScope()
+	case DirectDeclaratorStar: // DirectDeclarator '[' TypeQualifierList '*' ']'
+		return n.DirectDeclarator.ParamScope()
+	case DirectDeclaratorFuncParam: // DirectDeclarator '(' ParameterTypeList ')'
+		if s := n.DirectDeclarator.ParamScope(); s != nil {
+			return s
+		}
+
+		return n.paramScope
+	case DirectDeclaratorFuncIdent: // DirectDeclarator '(' IdentifierList ')'
+		if s := n.DirectDeclarator.ParamScope(); s != nil {
+			return s
+		}
+
+		return n.paramScope
+	default:
+		panic(internalError())
+	}
+}
+
+func (n *Enumerator) isVisible(at int32) bool { return n.Token.seq < at }
+
+func (n *EnumSpecifier) Type() Type { return n.typ }
+
+// Promote returns the type the operands of the binary operation are promoted to.
+func (n *EqualityExpression) Promote() Type { return n.promote }
+
+// Promote returns the type the operands of the binary operation are promoted to.
+func (n *AdditiveExpression) Promote() Type { return n.promote }
+
+// Promote returns the type the operands of the binary operation are promoted to.
+func (n *MultiplicativeExpression) Promote() Type { return n.promote }
+
+// Promote returns the type the operands of the binary operation are promoted to.
+func (n *InclusiveOrExpression) Promote() Type { return n.promote }
+
+// Promote returns the type the operands of the binary operation are promoted to.
+func (n *ExclusiveOrExpression) Promote() Type { return n.promote }
+
+// Promote returns the type the operands of the binary operation are promoted to.
+func (n *AndExpression) Promote() Type { return n.promote }
+
+func (n *InitDeclarator) Value() *InitializerValue { return n.initializer }
+
+// FirstDesignatorField returns the first field a designator of an union type
+// denotes, if any.
+func (n *Initializer) FirstDesignatorField() Field { return n.field0 }
+
+// TrailingComma returns the comma token following n, if any.
+func (n *Initializer) TrailingComma() *Token { return n.trailingComma }
+
+// IsConst reports whether n is constant.
+func (n *Initializer) IsConst() bool { return n == nil || n.isConst }
+
+// IsZero reports whether n is a zero value.
+func (n *Initializer) IsZero() bool { return n == nil || n.isZero }
+
+// List returns n as a flattened list of all items that are case
+// InitializerExpr.
+func (n *Initializer) List() []*Initializer { return n.list }
+
+// Parent returns the parent of n, if any.
+func (n *Initializer) Parent() *Initializer { return n.parent }
+
+// Type returns the type this initializer initializes.
+func (n *Initializer) Type() Type { return n.typ }
+
+// IsConst reports whether n is constant.
+func (n *InitializerList) IsConst() bool { return n == nil || n.isConst }
+
+// IsZero reports whether n is a zero value.
+func (n *InitializerList) IsZero() bool { return n == nil || n.isZero }
+
+// List returns n as a flattened list of all items that are case
+// InitializerExpr.
+func (n *InitializerList) List() []*Initializer {
+	if n == nil {
+		return nil
+	}
+
+	return n.list
+}
+
+// IsEmpty reprts whether n is an empty list.
+func (n *InitializerList) IsEmpty() bool { return len(n.list) == 0 }
+
+// LexicalScope returns the lexical scope of n.
+func (n *JumpStatement) LexicalScope() Scope { return n.lexicalScope }
+
+// LexicalScope returns the lexical scope of n.
+func (n *LabeledStatement) LexicalScope() Scope { return n.lexicalScope }
+
+func (n *ParameterDeclaration) Type() Type { return n.typ }
+
+func (n *Pointer) TypeQualifier() Type { return n.typeQualifiers }
+
+// ResolvedIn reports which scope the identifier of cases
+// PrimaryExpressionIdent, PrimaryExpressionEnum were resolved in, if any.
+func (n *PrimaryExpression) ResolvedIn() Scope { return n.resolvedIn }
+
+// ResolvedTo reports which Node the identifier of cases
+// PrimaryExpressionIdent, PrimaryExpressionEnum resolved to, if any.
+func (n *PrimaryExpression) ResolvedTo() Node { return n.resolvedTo }
+
+// Promote returns the type the operands of the binary operation are promoted to.
+func (n *RelationalExpression) Promote() Type { return n.promote }
+
+// Cases returns the cases a switch statement consist of, in source order.
+func (n *SelectionStatement) Cases() []*LabeledStatement { return n.cases }
+
+// Promote returns the type the shift count operand is promoted to.
+func (n *ShiftExpression) Promote() Type { return n.promote }
+
+func (n *StructOrUnionSpecifier) Type() Type { return n.typ }
+
+// Promote returns the type the type the switch expression is promoted to.
+func (n *SelectionStatement) Promote() Type { return n.promote }
+
+// Type returns the type of n.
+func (n *TypeName) Type() Type { return n.typ }
+
+// // LexicalScope returns the lexical scope of n.
+// func (n *AttributeValue) LexicalScope() Scope { return n.lexicalScope }
+
+// // Scope returns n's scope.
+// func (n *CompoundStatement) Scope() Scope { return n.scope }
+
+// // LexicalScope returns the lexical scope of n.
+// func (n *Designator) LexicalScope() Scope { return n.lexicalScope }
+
+// // LexicalScope returns the lexical scope of n.
+// func (n *DirectDeclarator) LexicalScope() Scope { return n.lexicalScope }
+
+// LexicalScope returns the lexical scope of n.
+func (n *EnumSpecifier) LexicalScope() Scope { return n.lexicalScope }
+
+// // LexicalScope returns the lexical scope of n.
+// func (n *IdentifierList) LexicalScope() Scope { return n.lexicalScope }
+
+// // LexicalScope returns the lexical scope of n.
+// func (n *PrimaryExpression) LexicalScope() Scope { return n.lexicalScope }
+
+// // LexicalScope returns the lexical scope of n.
+// func (n *StructOrUnionSpecifier) LexicalScope() Scope { return n.lexicalScope }
+
+// // ResolvedIn reports which scope the identifier of case
+// // TypeSpecifierTypedefName was resolved in, if any.
+// func (n *TypeSpecifier) ResolvedIn() Scope { return n.resolvedIn }
+
+func (n *TypeSpecifier) list() (r []*TypeSpecifier) {
+	switch n.Case {
+	case TypeSpecifierAtomic:
+		return n.AtomicTypeSpecifier.list
+	default:
+		return []*TypeSpecifier{n}
+	}
+}
+
+// // LexicalScope returns the lexical scope of n.
+// func (n *UnaryExpression) LexicalScope() Scope { return n.lexicalScope }
+
+func (n *UnaryExpression) Declarator() *Declarator {
+	switch n.Case {
+	case UnaryExpressionPostfix: // PostfixExpression
+		return n.PostfixExpression.Declarator()
+	default:
+		return nil
+	}
+}
+
+func (n *PostfixExpression) Declarator() *Declarator {
+	switch n.Case {
+	case PostfixExpressionPrimary: // PrimaryExpression
+		return n.PrimaryExpression.Declarator()
+	default:
+		return nil
+	}
+}
+
+func (n *PrimaryExpression) Declarator() *Declarator {
+	switch n.Case {
+	case PrimaryExpressionIdent: // IDENTIFIER
+		if n.Operand != nil {
+			return n.Operand.Declarator()
+		}
+
+		return nil
+	case PrimaryExpressionExpr: // '(' Expression ')'
+		return n.Expression.Declarator()
+	default:
+		return nil
+	}
+}
+
+func (n *Expression) Declarator() *Declarator {
+	switch n.Case {
+	case ExpressionAssign: // AssignmentExpression
+		return n.AssignmentExpression.Declarator()
+	default:
+		return nil
+	}
+}
+
+func (n *AssignmentExpression) Declarator() *Declarator {
+	switch n.Case {
+	case AssignmentExpressionCond: // ConditionalExpression
+		return n.ConditionalExpression.Declarator()
+	default:
+		return nil
+	}
+}
+
+func (n *ConditionalExpression) Declarator() *Declarator {
+	switch n.Case {
+	case ConditionalExpressionLOr: // LogicalOrExpression
+		return n.LogicalOrExpression.Declarator()
+	default:
+		return nil
+	}
+}
+
+func (n *LogicalOrExpression) Declarator() *Declarator {
+	switch n.Case {
+	case LogicalOrExpressionLAnd: // LogicalAndExpression
+		return n.LogicalAndExpression.Declarator()
+	default:
+		return nil
+	}
+}
+
+func (n *LogicalAndExpression) Declarator() *Declarator {
+	switch n.Case {
+	case LogicalAndExpressionOr: // InclusiveOrExpression
+		return n.InclusiveOrExpression.Declarator()
+	default:
+		return nil
+	}
+}
+
+func (n *InclusiveOrExpression) Declarator() *Declarator {
+	switch n.Case {
+	case InclusiveOrExpressionXor: // ExclusiveOrExpression
+		return n.ExclusiveOrExpression.Declarator()
+	default:
+		return nil
+	}
+}
+
+func (n *ExclusiveOrExpression) Declarator() *Declarator {
+	switch n.Case {
+	case ExclusiveOrExpressionAnd: // AndExpression
+		return n.AndExpression.Declarator()
+	default:
+		return nil
+	}
+}
+
+func (n *AndExpression) Declarator() *Declarator {
+	switch n.Case {
+	case AndExpressionEq: // EqualityExpression
+		return n.EqualityExpression.Declarator()
+	default:
+		return nil
+	}
+}
+
+func (n *EqualityExpression) Declarator() *Declarator {
+	switch n.Case {
+	case EqualityExpressionRel: // RelationalExpression
+		return n.RelationalExpression.Declarator()
+	default:
+		return nil
+	}
+}
+
+func (n *RelationalExpression) Declarator() *Declarator {
+	switch n.Case {
+	case RelationalExpressionShift: // ShiftExpression
+		return n.ShiftExpression.Declarator()
+	default:
+		return nil
+	}
+}
+
+func (n *ShiftExpression) Declarator() *Declarator {
+	switch n.Case {
+	case ShiftExpressionAdd: // AdditiveExpression
+		return n.AdditiveExpression.Declarator()
+	default:
+		return nil
+	}
+}
+
+func (n *AdditiveExpression) Declarator() *Declarator {
+	switch n.Case {
+	case AdditiveExpressionMul: // MultiplicativeExpression
+		return n.MultiplicativeExpression.Declarator()
+	default:
+		return nil
+	}
+}
+
+func (n *MultiplicativeExpression) Declarator() *Declarator {
+	switch n.Case {
+	case MultiplicativeExpressionCast: // CastExpression
+		return n.CastExpression.Declarator()
+	default:
+		return nil
+	}
+}
+
+func (n *CastExpression) Declarator() *Declarator {
+	switch n.Case {
+	case CastExpressionUnary: // UnaryExpression
+		return n.UnaryExpression.Declarator()
+	default:
+		return nil
+	}
+}
+
+// Has reports whether n has any of attributes in key.
+func (n *AttributeSpecifier) Has(key ...StringID) (*ExpressionList, bool) {
+	if n == nil {
+		return nil, false
+	}
+
+	for list := n.AttributeValueList; list != nil; list = list.AttributeValueList {
+		av := list.AttributeValue
+		for _, k := range key {
+			if av.Token.Value == k {
+				switch av.Case {
+				case AttributeValueIdent: // IDENTIFIER
+					return nil, true
+				case AttributeValueExpr: // IDENTIFIER '(' ExpressionList ')'
+					return av.ExpressionList, true
+				}
+			}
+		}
+	}
+	return nil, false
+}
+
+// Has reports whether n has any of attributes in key.
+func (n *AttributeSpecifierList) Has(key ...StringID) (*ExpressionList, bool) {
+	for ; n != nil; n = n.AttributeSpecifierList {
+		if exprList, ok := n.AttributeSpecifier.Has(key...); ok {
+			return exprList, ok
+		}
+	}
+	return nil, false
+}
+
+// Parent returns the CompoundStatement that contains n, if any.
+func (n *CompoundStatement) Parent() *CompoundStatement { return n.parent }
+
+// IsJumpTarget returns whether n or any of its children contain a named
+// labeled statement.
+func (n *CompoundStatement) IsJumpTarget() bool { return n.isJumpTarget }
+
+func (n *CompoundStatement) hasLabel() {
+	for ; n != nil; n = n.parent {
+		n.isJumpTarget = true
+	}
+}
+
+// Declarations returns the list of declarations in n.
+func (n *CompoundStatement) Declarations() []*Declaration { return n.declarations }
+
+// Children returns the list of n's children.
+func (n *CompoundStatement) Children() []*CompoundStatement { return n.children }
+
+// CompoundStatements returns the list of compound statements in n.
+func (n *FunctionDefinition) CompoundStatements() []*CompoundStatement { return n.compoundStatements }
+
+// CompoundStatement returns the block containing n.
+func (n *LabeledStatement) CompoundStatement() *CompoundStatement { return n.block }
+
+// LabeledStatements returns labeled statements of n.
+func (n *CompoundStatement) LabeledStatements() []*LabeledStatement { return n.labeledStmts }
+
+// HasInitializer reports whether d has an initializator.
+func (n *Declarator) HasInitializer() bool { return n.hasInitializer }
+
+// Context reports the statement, if any, a break or continue belongs to. Valid
+// only after typecheck and for n.Case == JumpStatementBreak or
+// JumpStatementContinue.
+func (n *JumpStatement) Context() Node { return n.context }
+
+// IsFunctionPrototype reports whether n is a function prototype.
+func (n *Declarator) IsFunctionPrototype() bool {
+	return n != nil && n.Type() != nil && n.Type().Kind() == Function && !n.fnDef && !n.IsParameter
+}
+
+// DeclarationSpecifiers returns the declaration specifiers associated with n or nil.
+func (n *Declarator) DeclarationSpecifiers() *DeclarationSpecifiers {
+	if x, ok := n.td.(*DeclarationSpecifiers); ok {
+		return x
+	}
+
+	return nil
+}
+
+// SpecifierQualifierList returns the specifier qualifer list associated with n or nil.
+func (n *Declarator) SpecifierQualifierList() *SpecifierQualifierList {
+	if x, ok := n.td.(*SpecifierQualifierList); ok {
+		return x
+	}
+
+	return nil
+}
+
+// TypeQualifier returns the type qualifiers associated with n or nil.
+func (n *Declarator) TypeQualifiers() *TypeQualifiers {
+	if x, ok := n.td.(*TypeQualifiers); ok {
+		return x
+	}
+
+	return nil
+}
+
+// StructDeclaration returns the struct declaration associated with n.
+func (n *StructDeclarator) StructDeclaration() *StructDeclaration { return n.decl }