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#! /your/favourite/path/to/ruby
# -*- mode: ruby; coding: utf-8; indent-tabs-mode: nil; ruby-indent-level: 2 -*-
# -*- frozen_string_literal: true; -*-
# -*- warn_indent: true; -*-
#
# Copyright (c) 2017 Urabe, Shyouhei. All rights reserved.
#
# This file is a part of the programming language Ruby. Permission is hereby
# granted, to either redistribute and/or modify this file, provided that the
# conditions mentioned in the file COPYING are met. Consult the file for
# details.
require_relative '../helpers/c_escape'
require_relative '../loaders/opt_operand_def'
require_relative 'bare_instructions'
class RubyVM::OperandsUnifications < RubyVM::BareInstructions
include RubyVM::CEscape
attr_reader :preamble, :original, :spec
def initialize location:, signature:
name = signature[0]
@original = RubyVM::BareInstructions.fetch name
template = @original.template
parts = compose location, signature, template[:signature]
json = template.dup
json[:location] = location
json[:signature] = parts[:signature]
json[:name] = parts[:name]
@preamble = parts[:preamble]
@spec = parts[:spec]
super template: template, **json
parts[:vars].each do |v|
@variables[v[:name]] ||= v
end
end
def operand_shift_of var
before = @original.opes.find_index var
after = @opes.find_index var
raise "no #{var} for #{@name}" unless before and after
return before - after
end
def condition ptr
# :FIXME: I'm not sure if this method should be in model?
exprs = @spec.each_with_index.map do |(var, val), i|
case val when '*' then
next nil
else
type = @original.opes[i][:type]
expr = RubyVM::Typemap.typecast_to_VALUE type, val
next "#{ptr}[#{i}] == #{expr}"
end
end
exprs.compact!
if exprs.size == 1 then
return exprs[0]
else
exprs.map! {|i| "(#{i})" }
return exprs.join ' && '
end
end
private
def namegen signature
insn, argv = *signature
wcary = argv.map do |i|
case i when '*' then
'WC'
else
i
end
end
as_tr_cpp [insn, *wcary].join(', ')
end
def compose location, spec, template
name = namegen spec
*, argv = *spec
opes = @original.opes
if opes.size != argv.size
raise sprintf("operand size mismatch for %s (%s's: %d, given: %d)",
name, template[:name], opes.size, argv.size)
else
src = []
mod = []
spec = []
vars = []
argv.each_index do |i|
j = argv[i]
k = opes[i]
spec[i] = [k, j]
case j when '*' then
# operand is from iseq
mod << k[:decl]
else
# operand is inside C
vars << k
src << {
location: location,
expr: " #{k[:name]} = #{j};"
}
end
end
src.map! {|i| RubyVM::CExpr.new i }
return {
name: name,
signature: {
name: name,
ope: mod,
pop: template[:pop],
ret: template[:ret],
},
preamble: src,
vars: vars,
spec: spec
}
end
end
@instances = RubyVM::OptOperandDef.map do |h|
new(**h)
end
def self.to_a
@instances
end
def self.each_group
to_a.group_by(&:original).each_pair do |k, v|
yield k, v
end
end
end
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