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// Copyright 2017 syzkaller project authors. All rights reserved.
// Use of this source code is governed by Apache 2 LICENSE that can be found in the LICENSE file.
// Package ast parses and formats sys files.
package ast
// Pos represents source info for AST nodes.
type Pos struct {
File string
Off int // byte offset, starting at 0
Line int // line number, starting at 1
Col int // column number, starting at 1 (byte count)
}
// Description contains top-level nodes of a parsed sys description.
type Description struct {
Nodes []Node
}
// Node is AST node interface.
type Node interface {
Info() (pos Pos, typ string, name string)
// Clone makes a deep copy of the node.
Clone() Node
// walk calls callback cb for all child nodes of this node.
// Note: it's not recursive. Use Recursive helper for recursive walk.
walk(cb func(Node))
}
// Top-level AST nodes.
type NewLine struct {
Pos Pos
}
func (n *NewLine) Info() (Pos, string, string) {
return n.Pos, tok2str[tokNewLine], ""
}
type Comment struct {
Pos Pos
Text string
}
func (n *Comment) Info() (Pos, string, string) {
return n.Pos, tok2str[tokComment], ""
}
type Include struct {
Pos Pos
File *String
}
func (n *Include) Info() (Pos, string, string) {
return n.Pos, tok2str[tokInclude], ""
}
type Incdir struct {
Pos Pos
Dir *String
}
func (n *Incdir) Info() (Pos, string, string) {
return n.Pos, tok2str[tokInclude], ""
}
type Define struct {
Pos Pos
Name *Ident
Value *Int
}
func (n *Define) Info() (Pos, string, string) {
return n.Pos, tok2str[tokDefine], n.Name.Name
}
type Resource struct {
Pos Pos
Name *Ident
Base *Type
Values []*Int
}
func (n *Resource) Info() (Pos, string, string) {
return n.Pos, tok2str[tokResource], n.Name.Name
}
type Call struct {
Pos Pos
Name *Ident
CallName string
NR uint64
Args []*Field
Ret *Type
Attrs []*Type
}
func (n *Call) Info() (Pos, string, string) {
return n.Pos, "syscall", n.Name.Name
}
type Struct struct {
Pos Pos
Name *Ident
Fields []*Field
Attrs []*Type
Comments []*Comment
IsUnion bool
}
func (n *Struct) Info() (Pos, string, string) {
typ := "struct"
if n.IsUnion {
typ = "union"
}
return n.Pos, typ, n.Name.Name
}
type IntFlags struct {
Pos Pos
Name *Ident
Values []*Int
}
func (n *IntFlags) Info() (Pos, string, string) {
return n.Pos, "flags", n.Name.Name
}
type StrFlags struct {
Pos Pos
Name *Ident
Values []*String
}
func (n *StrFlags) Info() (Pos, string, string) {
return n.Pos, "string flags", n.Name.Name
}
type TypeDef struct {
Pos Pos
Name *Ident
// Non-template type aliases have only Type filled.
// Templates have Args and either Type or Struct filled.
Args []*Ident
Type *Type
Struct *Struct
}
func (n *TypeDef) Info() (Pos, string, string) {
return n.Pos, "type", n.Name.Name
}
// Not top-level AST nodes.
type Ident struct {
Pos Pos
Name string
}
func (n *Ident) Info() (Pos, string, string) {
return n.Pos, tok2str[tokIdent], n.Name
}
type String struct {
Pos Pos
Value string
Fmt StrFmt
}
func (n *String) Info() (Pos, string, string) {
return n.Pos, tok2str[tokString], ""
}
type IntFmt int
const (
IntFmtDec IntFmt = iota
IntFmtNeg
IntFmtHex
IntFmtChar
)
type StrFmt int
const (
StrFmtRaw StrFmt = iota
StrFmtHex
)
type Int struct {
Pos Pos
// Only one of Value, Ident, CExpr is filled.
Value uint64
ValueFmt IntFmt
Ident string
CExpr string
}
func (n *Int) Info() (Pos, string, string) {
return n.Pos, tok2str[tokInt], ""
}
type Type struct {
Pos Pos
// Only one of Value, Ident, String is filled.
Value uint64
ValueFmt IntFmt
Ident string
String string
StringFmt StrFmt
HasString bool
// Parts after COLON (for ranges and bitfields).
Colon []*Type
// Sub-types in [].
Args []*Type
}
func (n *Type) Info() (Pos, string, string) {
return n.Pos, "type", n.Ident
}
type Field struct {
Pos Pos
Name *Ident
Type *Type
NewBlock bool // separated from previous fields by a new line
Comments []*Comment
}
func (n *Field) Info() (Pos, string, string) {
return n.Pos, "arg/field", n.Name.Name
}
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