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executable file 87 lines (64 sloc) 1.99 KB
#!/usr/bin/env ruby
# Mipsgen is a command line tool that generates code for MIPS bytecode
# disassemblers.
#
# The current code generation flavours are c, javascript and ruby.
#
# usage:
# mipsgen.rb c
# mipsgen.rb rb
# mipsgen.rb js
require 'pp'
$:.unshift(File.expand_path("../../codegen", __FILE__))
require 'parse.rb'
require 'ancillary.rb'
def path_of(table_filename)
$script_dir + '/../tables/' + table_filename
end
# Load all the code generator modules.
def load_code_generators(flavours)
flavours.each{|f|
require "#{f}gen.rb"
gen_fn = "#{f}_generate".to_sym
if (!Object.respond_to?(gen_fn, true))
raise "code generator #{f} does not have #{f}_generate method"
end
}
end
# Load and process the metadata needed for the code generators.
def load_metadata()
codegen_info = {}
dt = parse_dispatch_tables(path_of('dispatch_tables.txt'))
ob = parse_opcode_bits(path_of('opcode_bits.txt'))
af = parse_asm_format(path_of('asm_format.txt'))
ff = parse_field_format(path_of('field_format.txt'))
check_integrity(dt, ob, af, ff)
bm = build_masks(ob)
sg = build_switch_groups(dt)
codegen_info = {'dispatch_tables' => dt, 'asm_format' => af,
'opcode_bits' => ob, 'field_format' => ff,
'bitmasks' => bm}
sg.each{|k,v|
codegen_info['dispatch_tables'][k]['groups'] = v
}
return codegen_info
end
# This is the mipsgen entry point.
#
# Initialize the code generators and metadata, then call the correct
# generator for the requested flavour in ARGV[0].
def main()
Signal.trap("PIPE", "EXIT")
$script_dir = File.dirname(__FILE__)
flavours = %w[c js rb]
load_code_generators(flavours)
flavour = ARGV[0]
if (!flavours.include?(flavour))
STDERR.puts "usage: generator.rb #{flavours.join('|')}"
exit 1
end
codegen_info = load_metadata()
gen_fn = "#{flavour}_generate".to_sym
Object.send(gen_fn, codegen_info)
end
main()