rubyx/lib/risc/risc_compiler.rb
Torsten Ruger 6bd01fd55f rename method_compiler
in line with other compiler XX_Compiler being the compiler for that layer
remove type from compiler as it is in method available
2018-06-29 14:48:52 +03:00

120 lines
4.3 KiB
Ruby

module Risc
# RiscCompiler (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 RiscCompiler
def initialize( method )
@regs = []
@method = method
@current = @method.risc_instructions
end
attr_reader :method
# helper method for builtin mainly
# the class_name is a symbol, which is resolved to the instance_type of that class
#
# return compiler_for_type with the resolved type
#
def self.compiler_for_class( 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
compiler_for_type( 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
def self.compiler_for_type( 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 code builder that uses this compiler
# CodeBuilder returns code after building
def code_builder( source)
CodeBuilder.new(self , source)
end
# return a CompilerBuilder
# CompilerBuilder adds the generated code to the compiler
def compiler_builder( source)
CompilerBuilder.new(self , source)
end
end
end