lexer into its own TGSourceMgr class.

llvm-svn: 66873

-Bring in int64_t for TableGen/Record.h and TableGen/TGLexer.h
-Define strtoull

llvm-svn: 57970

use a SUB instruction instead of an ADD, because -128 can be
encoded in an 8-bit signed immediate field, while +128 can't be.
This avoids the need for a 32-bit immediate field in this case.

A similar optimization applies to 64-bit adds with 0x80000000,
with the 32-bit signed immediate field.

To support this, teach tablegen how to handle 64-bit constants.

llvm-svn: 57663

llvm-svn: 45419

llvm-svn: 44282

This makes the parser much easier to understand, eliminates a ton of global variables,
and gives tblgen nice caret diagnostics.  It is also faster, but tblgen probably doesn't
care about performance.

There are a couple of FIXMEs which I will take care of next.

llvm-svn: 44274

llvm-svn: 44227

llvm-svn: 44226

one dependency on flex and gets rid of two ".cvs" files.

llvm-svn: 44210