func IsRegisterShift(r ScanToken) bool
IsRegisterShift reports whether the token is one of the ARM register shift operators.
Input is the main input: a stack of readers and some macro definitions. It also handles #include processing (by pushing onto the input stack) and parses and instantiates macro definitions.
type Input struct {
Stack
// contains filtered or unexported fields
}
func NewInput(name string) *Input
NewInput returns an Input from the given path.
func (in *Input) Close()
func (in *Input) Error(args ...interface{})
func (in *Input) Next() ScanToken
func (in *Input) Push(r TokenReader)
func (in *Input) Text() string
A Macro represents the definition of a #defined macro.
type Macro struct {
// contains filtered or unexported fields
}
A ScanToken represents an input item. It is a simple wrapping of rune, as returned by text/scanner.Scanner, plus a couple of extra values.
type ScanToken rune
const (
// Asm defines some two-character lexemes. We make up
// a rune/ScanToken value for them - ugly but simple.
LSH ScanToken = -1000 - iota // << Left shift.
RSH // >> Logical right shift.
ARR // -> Used on ARM for shift type 3, arithmetic right shift.
ROT // @> Used on ARM for shift type 4, rotate right.
Include // included file started here
BuildComment // //go:build or +build comment
)
func (t ScanToken) String() string
A Slice reads from a slice of Tokens.
type Slice struct {
// contains filtered or unexported fields
}
func NewSlice(base *src.PosBase, line int, tokens []Token) *Slice
func (s *Slice) Base() *src.PosBase
func (s *Slice) Close()
func (s *Slice) Col() int
func (s *Slice) File() string
func (s *Slice) Line() int
func (s *Slice) Next() ScanToken
func (s *Slice) SetBase(base *src.PosBase)
func (s *Slice) Text() string
A Stack is a stack of TokenReaders. As the top TokenReader hits EOF, it resumes reading the next one down.
type Stack struct {
// contains filtered or unexported fields
}
func (s *Stack) Base() *src.PosBase
func (s *Stack) Close()
func (s *Stack) Col() int
func (s *Stack) File() string
func (s *Stack) Line() int
func (s *Stack) Next() ScanToken
func (s *Stack) Push(tr TokenReader)
Push adds tr to the top (end) of the input stack. (Popping happens automatically.)
func (s *Stack) SetBase(base *src.PosBase)
func (s *Stack) Text() string
A Token is a scan token plus its string value. A macro is stored as a sequence of Tokens with spaces stripped.
type Token struct {
ScanToken
// contains filtered or unexported fields
}
func Make(token ScanToken, text string) Token
Make returns a Token with the given rune (ScanToken) and text representation.
func Tokenize(str string) []Token
Tokenize turns a string into a list of Tokens; used to parse the -D flag and in tests.
func (l Token) String() string
A TokenReader is like a reader, but returns lex tokens of type Token. It also can tell you what the text of the most recently returned token is, and where it was found. The underlying scanner elides all spaces except newline, so the input looks like a stream of Tokens; original spacing is lost but we don't need it.
type TokenReader interface {
// Next returns the next token.
Next() ScanToken
// The following methods all refer to the most recent token returned by Next.
// Text returns the original string representation of the token.
Text() string
// File reports the source file name of the token.
File() string
// Base reports the position base of the token.
Base() *src.PosBase
// SetBase sets the position base.
SetBase(*src.PosBase)
// Line reports the source line number of the token.
Line() int
// Col reports the source column number of the token.
Col() int
// Close does any teardown required.
Close()
}
func NewLexer(name string) TokenReader
NewLexer returns a lexer for the named file and the given link context.
A Tokenizer is a simple wrapping of text/scanner.Scanner, configured for our purposes and made a TokenReader. It forms the lowest level, turning text from readers into tokens.
type Tokenizer struct {
// contains filtered or unexported fields
}
func NewTokenizer(name string, r io.Reader, file *os.File) *Tokenizer
func (t *Tokenizer) Base() *src.PosBase
func (t *Tokenizer) Close()
func (t *Tokenizer) Col() int
func (t *Tokenizer) File() string
func (t *Tokenizer) Line() int
func (t *Tokenizer) Next() ScanToken
func (t *Tokenizer) SetBase(base *src.PosBase)
func (t *Tokenizer) Text() string