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This commit is contained in:
Torsten Ruger
2014-07-25 11:48:06 +03:00
parent 8d7b353f33
commit 7df1490da8
4 changed files with 71 additions and 8 deletions
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12
lib/virtual/machine.rb
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@ -11,7 +11,7 @@ module Virtual
# - low level means it's basic instructions are realively easily implemented in a register machine. ie send is not
# a an instruction but a function.
#
# So the memory model of the machine allows for indexed access into and "object" . A fixed number of objects exist
# So the memory model of the machine allows for indexed access into an "object" . A fixed number of objects exist
# (ie garbage collection is reclaming, not destroying and recreating) although there may be a way to increase that number.
#
# The ast is transformed to virtaul-machine objects, some of which represent code, some data.
@ -19,12 +19,12 @@ module Virtual
# The next step transforms to the register machine layer, which is what actually executes.
#
# More concretely, an virtual machine is a sort of oo turing machine, it has a current instruction, executes the
# More concretely, a virtual machine is a sort of oo turing machine, it has a current instruction, executes the
# instructions, fetches the next one and so on.
# Off course the instructions are not soo simple, but in oo terms quite so.
#
# The machine is virtual in the sense that it is completely
# modeled in software, it's complete state explicitly available (not implicitly by walking stacks or something)
# The machine is virtual in the sense that it is completely modeled in software,
# it's complete state explicitly available (not implicitly by walking stacks or something)
# The machine has a no register, but local variables, a scope at each point in time.
# Scope changes with calls and blocks, but is saved at each level. In terms of lower level implementation this means
@ -34,9 +34,9 @@ module Virtual
def initialize
the_end = Halt.new
@frame = Message.new(the_end , the_end , :Object)
@message = Message.new(the_end , the_end , :Object)
end
attr_reader :frame
attr_reader :message
# run the instruction stream given. Instructions are a graph and executing means traversing it.
# If there is no next instruction the machine stops