rubyx/lib/risc
Torsten Ruger 1dabe0fda1 finish the idea behind #8, conditionally creating variables
by using space? , the ? makes for conditional creation of the variable
This is especially useful for constants (ie space)
2018-08-15 19:59:17 +03:00
..
builtin remove the last use of an add_xx function, closing #9 2018-08-15 19:37:03 +03:00
instructions bring the blocks down to mom level 2018-07-24 11:35:49 +03:00
position fix more of the changed names 2018-08-12 13:10:44 +03:00
assembler.rb generalize assemblers to use callables 2018-07-30 10:23:42 +03:00
binary_writer.rb jump was written off the end of binary code, fixed 2018-05-28 11:45:04 +03:00
block_compiler.rb fix scoping of blockcompiler 2018-07-31 18:00:42 +03:00
builder.rb finish the idea behind #8, conditionally creating variables 2018-08-15 19:59:17 +03:00
builtin.rb new get_type_by_class_name helper for space 2018-07-13 21:50:40 +03:00
callable_compiler.rb use the return jump to jump to the return sequence 2018-08-02 17:36:39 +03:00
collector.rb rename typed_method to callable_method 2018-07-07 09:11:09 +03:00
fake_memory.rb cache index resolution 2018-08-12 13:09:34 +03:00
instruction.rb block test 2018-07-30 14:10:24 +03:00
interpreter_platform.rb fix platform derivation and some tests 2018-07-01 21:27:27 +03:00
interpreter.rb misc 2018-07-30 10:26:47 +03:00
linker.rb generalize assemblers to use callables 2018-07-30 10:23:42 +03:00
method_compiler.rb propagate constants from block_compiler up 2018-08-01 16:27:34 +03:00
padding.rb fix opal error 2018-05-20 15:51:36 +03:00
parfait_adapter.rb cache index resolution 2018-08-12 13:09:34 +03:00
parfait_boot.rb fix more of the changed names 2018-08-12 13:10:44 +03:00
platform.rb platform helper 2018-07-02 09:36:29 +03:00
README.md polish docs 2018-03-11 16:11:15 +05:30
register_value.rb remove some more add_xx functions 2018-08-14 20:24:48 +03:00
text_writer.rb still some names that needed changing 2018-08-12 14:48:20 +03:00

Risc Machine

The RiscMachine, is an abstract machine with registers. Think of it as an arm machine with normal instruction names. It is not however an abstraction of existing hardware, but only of that subset that we need.

Our primary objective is to compile typed code to this level, so the register machine has:

  • object access instructions
  • object load
  • object oriented call semantics
  • extended (and extensible) branching
  • normal integer operators (but no sub word instructions)

All data is in objects.

The register machine is aware of Parfait objects, and specifically uses Message and Frame to express call semantics.

Calls and syscalls

The RiscMachine only uses 1 fixed register, the currently worked on Message. (and assumes a program counter and flags, neither of which are directly manipulated)

There is no stack, rather messages form a linked list, and preparing to call, the data is pre-filled into the next message. Calling then means moving the new message to the current one and jumping to the address of the method. Returning is the somewhat reverse process.

Syscalls are implemented by one Syscall instruction. The Risc machine does not specify/limit the meaning or number of syscalls. This is implemented by the level below, eg the arm/interpreter.

Interpreter

There is an interpreter that can interpret compiled register machine programs. This is very handy for debugging (and nothing else).

Even more handy is the graphical interface for the interpreter, which is in it's own repository: rubyx-debugger.

Arm / Elf

There is also a (very straightforward) transformation to arm instructions. Together with the also quite minimal elf module, arm binaries can be produced.

These binaries have no external dependencies and in fact can not even call c at the moment (only syscalls :-)).