131 lines
4.9 KiB
Ruby
131 lines
4.9 KiB
Ruby
module Risc
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# MethodCompiler (old name) is used to generate risc instructions for methods
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# and to instantiate the methods correctly. Most of the init is typed layer stuff,
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# but there is some logic too.
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# - risc_instructions: The sequence of risc level instructions that mom was compiled to
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# - cpu_instructions: The sequence of cpu specific instructions that the
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# risc_instructions was compiled to
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# Instructions derive from class Instruction and form a linked list
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class MethodCompiler
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def initialize( method )
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@regs = []
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@method = method
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name = "#{method.self_type.name}.#{method.name}"
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@risc_instructions = Risc.label(name, name)
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@risc_instructions << Risc.label( name, "unreachable")
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@current = @risc_instructions
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@constants = []
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end
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attr_reader :method , :risc_instructions , :constants
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# helper method for builtin mainly
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# the class_name is a symbol, which is resolved to the instance_type of that class
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#
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# return compiler_self_type with the resolved type
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#
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def self.compiler_for_class( class_name , method_name , args , frame )
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raise "create_method #{class_name}.#{class_name.class}" unless class_name.is_a? Symbol
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clazz = Parfait.object_space.get_class_by_name! class_name
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compiler_self_type( clazz.instance_type , method_name , args , frame)
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end
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# create a method for the given type ( Parfait type object)
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# method_name is a Symbol
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# args a hash that will be converted to a type
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# the created method is set as the current and the given type too
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# return the compiler
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def self.compiler_self_type( type , method_name , args , frame)
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raise "create_method #{type.inspect} is not a Type" unless type.is_a? Parfait::Type
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raise "Args must be Type #{args}" unless args.is_a?(Parfait::Type)
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raise "create_method #{method_name}.#{method_name.class}" unless method_name.is_a? Symbol
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method = type.create_method( method_name , args , frame)
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self.new(method)
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end
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# convert the given mom instruction to_risc and then add it (see add_code)
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# continue down the instruction chain unti depleted
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# (adding moves the insertion point so the whole mom chain is added as a risc chain)
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def add_mom( instruction )
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while( instruction )
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raise "whats this a #{instruction}" unless instruction.is_a?(Mom::Instruction)
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#puts "adding mom #{instruction.to_s}:#{instruction.next.to_s}"
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risc = instruction.to_risc( self )
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add_code(risc)
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reset_regs
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#puts "adding risc #{risc.to_s}:#{risc.next.to_s}"
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instruction = instruction.next
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end
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end
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# add a constant (which get created during compilation and need to be linked)
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def add_constant(const)
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raise "Must be Parfait #{const}" unless const.is_a?(Parfait::Object)
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@constants << const
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end
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# add a risc instruction after the current (insertion point)
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# the added instruction will become the new insertion point
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def add_code( instruction )
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raise "Not an instruction:#{instruction.to_s}" unless instruction.is_a?(Risc::Instruction)
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raise instruction.to_s if( instruction.class.name.split("::").first == "Arm")
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new_current = instruction.last #after insertion this point is lost
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@current.insert(instruction) #insert after current
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@current = new_current
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self
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end
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# require a (temporary) register. code must give this back with release_reg
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def use_reg( type , value = nil )
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raise "Not type #{type.inspect}" unless type.is_a?(Symbol) or type.is_a?(Parfait::Type)
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if @regs.empty?
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reg = Risc.tmp_reg(type , value)
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else
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reg = @regs.last.next_reg_use(type , value)
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end
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@regs << reg
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return reg
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end
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def copy( reg , source )
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copied = use_reg reg.type
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add_code Register.transfer( source , reg , copied )
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copied
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end
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# releasing a register (accuired by use_reg) makes it available for use again
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# thus avoiding possibly using too many registers
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def release_reg( reg )
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last = @regs.pop
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raise "released register in wrong order, expect #{last} but was #{reg}" if reg != last
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end
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# reset the registers to be used. Start at r4 for next usage.
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# Every statement starts with this, meaning each statement may use all registers, but none
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# get saved. Statements have affect on objects.
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def reset_regs
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@regs.clear
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end
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# Build with builder (see there), adding the created instructions
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def build(&block)
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builder.build(&block)
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end
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# return a new code builder that uses this compiler
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# CodeBuilder returns code after building
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def code_builder( source)
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CodeBuilder.new(self , source)
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end
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# return a CompilerBuilder
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# CompilerBuilder adds the generated code to the compiler
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def compiler_builder( source)
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CompilerBuilder.new(self , source)
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end
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end
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end
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