This chapter describes the machine-independent syntax allowed in a source file. `as' syntax is similar to what many other assemblers use; it is inspired by the BSD 4.2 assembler, except that `as' does not assemble Vax bit-fields.
| Preprocessing | Preprocessing |
| Whitespace | Whitespace |
| Comments | Comments |
| Symbol Intro | Symbols |
| Statements | Statements |
| Constants | Constants |