Add main.go, the simple driver for the assembler, and the
subdirectory internal/asm, which contains the parser and
instruction generator.
It's likely that much of the implementation is superstition,
or at best experimental phenomenology, but it does generate
working binaries.
Change-Id: I322a9ae8a20174b6693153f30e39217ba68f8032
Reviewed-on: https://go-review.googlesource.com/3196
Reviewed-by: Russ Cox <rsc@golang.org>
Add the lexing code for the new portable assembler.
It is internal to the assembler, so lives in a subdirectory of cmd/asm/internal.
Its only new dependency is the flags package for the assembler, so
add that too; it's trivial. That package manages the command-line
flags in a central place.
The lexer builds on text/scanner to lex the input, including doing a
Plan 9-level implementation of the C preprocessor.
Change-Id: I262e8717b8c797010afaa5051920839906c0dd19
Reviewed-on: https://go-review.googlesource.com/3195
Reviewed-by: Russ Cox <rsc@golang.org>
This simple package holds the definition of the Addr (address) type
that represents addresses inside the assembler.
It has no dependencies.
Change-Id: I7573fd70f1847ef68e3d6b663dc4c39eb2ebf8b3
Reviewed-on: https://go-review.googlesource.com/3193
Reviewed-by: Russ Cox <rsc@golang.org>
This package builds the representation of the machine architecture
for the new assembler.
Almost nothing in it is likely to last but this will get things running.
Change-Id: I8edd891f927a81f76d2dbdcd7484b9c87ac0fb2e
Reviewed-on: https://go-review.googlesource.com/3194
Reviewed-by: Russ Cox <rsc@golang.org>
