SubX in SubX: Transforming uses of string literals

This branch is work in progress on implementing SubX in SubX. The big-picture plan is to divide up the work into the following phases:

$ cat file1.subx file2.subx ... |dquotes |assort |pack |survey |hex > a.elf

Each phase is an ELF binary constructed out of a corresponding .subx file.

hex.subx converts a sequence of bytes in hex into a binary. (done)
survey.subx will turn labels into addresses, and also slap on ELF headers. It's called 'survey' because the act of imposing a coordinate system on a program feels somewhat like surveying terrain and determining various distances and heights. (not started)
pack.subx converts bitfields in instructions into whole bytes in the right order. For example, 0/mod 1/rm32 1/r32 is turned into the single byte 08. (done)
assort.subx just reads in many segments starting with == and containing lines of code or data, and concatenates all segments with the same name. (done)
dquotes.subx moves string literals in the code segment to the data segment. (in progress here)

This branch is where the final phase is being built.

To run its tests (and so see how far along things are):

$ ./subx translate 0*.subx apps/subx-common.subx apps/dquotes.subx -o apps/dquotes  &&  \
      ./subx run apps/dquotes test

Contact me if you'd like to contribute. Commit access freely given.

akkartik / mu