118 lines
4.3 KiB
Ruby
118 lines
4.3 KiB
Ruby
module Risc
|
|
|
|
# MethodCompiler (old name) is used to generate risc instructions for methods
|
|
# and to instantiate the methods correctly. Most of the init is typed layer stuff,
|
|
# but there is some logic too.
|
|
|
|
class MethodCompiler
|
|
|
|
def initialize( method )
|
|
@regs = []
|
|
if method == :main
|
|
@type = Parfait.object_space.get_type()
|
|
@method = @type.get_method( :main )
|
|
@method = @type.create_method( :main ,{}) unless @method
|
|
else
|
|
@method = method
|
|
@type = method.for_type
|
|
end
|
|
@current = @method.risc_instructions
|
|
end
|
|
attr_reader :type , :method
|
|
|
|
# create the method, do some checks and set it as the current method to be added to
|
|
# class_name and method_name are pretty clear, args are given as a ruby array
|
|
def self.create_method( class_name , method_name , args , frame )
|
|
raise "create_method #{class_name}.#{class_name.class}" unless class_name.is_a? Symbol
|
|
clazz = Parfait.object_space.get_class_by_name! class_name
|
|
create_method_for( clazz.instance_type , method_name , args , frame)
|
|
end
|
|
|
|
# create a method for the given type ( Parfait type object)
|
|
# method_name is a Symbol
|
|
# args a hash that will be converted to a type
|
|
# the created method is set as the current and the given type too
|
|
# return the compiler (for chaining)
|
|
def self.create_method_for( type , method_name , args , frame)
|
|
raise "create_method #{type.inspect} is not a Type" unless type.is_a? Parfait::Type
|
|
raise "Args must be Type #{args}" unless args.is_a?(Parfait::Type)
|
|
raise "create_method #{method_name}.#{method_name.class}" unless method_name.is_a? Symbol
|
|
method = type.create_method( method_name , args , frame)
|
|
self.new(method)
|
|
end
|
|
|
|
# convert the given mom instruction to_risc and then add it (see add_code)
|
|
# continue down the instruction chain unti depleted
|
|
# (adding moves the insertion point so the whole mom chain is added as a risc chain)
|
|
def add_mom( instruction )
|
|
while( instruction )
|
|
raise "whats this a #{instruction}" unless instruction.is_a?(Mom::Instruction)
|
|
#puts "adding mom #{instruction.to_s}:#{instruction.next.to_s}"
|
|
risc = instruction.to_risc( self )
|
|
add_code(risc)
|
|
reset_regs
|
|
#puts "adding risc #{risc.to_s}:#{risc.next.to_s}"
|
|
instruction = instruction.next
|
|
end
|
|
end
|
|
|
|
def add_constant(const)
|
|
Risc.machine.add_constant(const)
|
|
end
|
|
|
|
# add a risc instruction after the current (insertion point)
|
|
# the added instruction will become the new insertion point
|
|
def add_code( instruction )
|
|
raise "Not an instruction:#{instruction.to_s}" unless instruction.is_a?(Risc::Instruction)
|
|
raise instruction.to_s if( instruction.class.name.split("::").first == "Arm")
|
|
new_current = instruction.last #after insertion this point is lost
|
|
@current.insert(instruction) #insert after current
|
|
@current = new_current
|
|
self
|
|
end
|
|
|
|
# require a (temporary) register. code must give this back with release_reg
|
|
def use_reg( type , value = nil )
|
|
raise "Not type #{type.inspect}" unless type.is_a?(Symbol) or type.is_a?(Parfait::Type)
|
|
if @regs.empty?
|
|
reg = Risc.tmp_reg(type , value)
|
|
else
|
|
reg = @regs.last.next_reg_use(type , value)
|
|
end
|
|
@regs << reg
|
|
return reg
|
|
end
|
|
|
|
def copy( reg , source )
|
|
copied = use_reg reg.type
|
|
add_code Register.transfer( source , reg , copied )
|
|
copied
|
|
end
|
|
|
|
# releasing a register (accuired by use_reg) makes it available for use again
|
|
# thus avoiding possibly using too many registers
|
|
def release_reg( reg )
|
|
last = @regs.pop
|
|
raise "released register in wrong order, expect #{last} but was #{reg}" if reg != last
|
|
end
|
|
|
|
# reset the registers to be used. Start at r4 for next usage.
|
|
# Every statement starts with this, meaning each statement may use all registers, but none
|
|
# get saved. Statements have affect on objects.
|
|
def reset_regs
|
|
@regs.clear
|
|
end
|
|
|
|
# Build with builder (see there), adding the created instructions
|
|
def build(&block)
|
|
builder.build(&block)
|
|
end
|
|
|
|
# return a new builder that uses this compiler
|
|
# must specify weather to add code automatically to compiler
|
|
def builder( auto_add )
|
|
Builder.new(self , auto_add)
|
|
end
|
|
end
|
|
end
|