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#!/usr/bin/ruby -w
$insts = {}
$next_opcode = 0
def inst(pattern, vector=false, &code)
return if vector
throw "instruction with this pattern already defined" if $insts.member?(pattern)
$insts[pattern] = $next_opcode
$next_opcode += 1
end
load "insts.rb"
$labels = {}
$pc = 0
ARGF.each_line do | line |
line.chomp!
line.gsub!(/^\s+/, "")
line.gsub!(/#.*/, "")
line.gsub!(/\s+$/, "")
next if line == ""
if line =~ /^([a-zA-Z_][a-zA-Z0-9_]*):$/
$labels[$1] = $pc
$stdout.write("\t// #{line}\n")
next
elsif line =~ /^\.origin\s+((?:0x[0-9a-fA-F]+)?(?:\d+))$/
$pc = $1.to_i(0)
$stdout.write("@#{$pc.to_s(16)}\t// #{line}\n")
next
elsif line =~ /^\.bytes?\s+(.*)$/
data = $1.split(/\s+/)
data.map { | x | throw "invalid byte #{x}" unless x =~ /^-?(?:(?:0x[0-9a-fA-F]+)|(?:\d+))$/ }
data = data.map { | x | x.to_i(0) }
data = data.map { | x | x < 0 ? x + 0x100 : x }
data.map { | x | throw "invalid byte 0x#{x.to_s(16)}" unless x >= 0 && x <= 0xff }
data = data.map { | x | x.to_s(16).rjust(2, "0") }
$pc += data.size
$stdout.write("#{data.join(" ")}\t// #{line}\n")
next
elsif line =~ /^\.shorts?\s+(.*)$/
data = $1.split(/\s+/)
data.map { | x | throw "invalid short #{x}" unless x =~ /^-?(?:(?:0x[0-9a-fA-F]+)|(?:\d+))$/ }
data = data.map { | x | x.to_i(0) }
data = data.map { | x | x < 0 ? x + 0x10000 : x }
data.map { | x | throw "invalid short 0x#{x.to_s(16)}" unless x >= 0 && x <= 0xffff }
data = data.flat_map { | x | [x & 0xff, x >> 8] }
data = data.map { | x | x.to_s(16).rjust(2, "0") }
$pc += data.size
$stdout.write("#{data.join(" ")}\t// #{line}\n")
next
elsif line =~ /^\.longs?\s+(.*)$/
data = $1.split(/\s+/)
data.map { | x | throw "invalid long #{x}" unless x =~ /^-?(?:(?:0x[0-9a-fA-F]+)|(?:\d+))$/ }
data = data.map { | x | x.to_i(0) }
data = data.map { | x | x < 0 ? x + 0x100000000 : x }
data.map { | x | throw "invalid long 0x#{x.to_s(16)}" unless x >= 0 && x <= 0xffffffff }
data = data.flat_map { | x | [x & 0xff, (x >> 8) & 0xff, (x >> 16) & 0xff, x >> 24] }
data = data.map { | x | x.to_s(16).rjust(2, "0") }
$pc += data.size
$stdout.write("#{data.join(" ")}\t// #{line}\n")
next
elsif line =~ /^\.quads?\s+(.*)$/
data = $1.split(/\s+/)
data.map { | x | throw "invalid quad #{x}" unless x =~ /^-?(?:(?:0x[0-9a-fA-F]+)|(?:\d+))$/ }
data = data.map { | x | x.to_i(0) }
data = data.map { | x | x < 0 ? x + 0x10000000000000000 : x }
data.map { | x | throw "invalid quad 0x#{x.to_s(16)}" unless x >= 0 && x <= 0xffffffffffffffff }
data = data.flat_map { | x | [x & 0xff, (x >> 8) & 0xff, (x >> 16) & 0xff, (x >> 24) & 0xff, (x >> 32) & 0xff, (x >> 40) & 0xff, (x >> 48) & 0xff, x >> 56] }
data = data.map { | x | x.to_s(16).rjust(2, "0") }
$pc += data.size
$stdout.write("#{data.join(" ")}\t// #{line}\n")
next
end
parts = line.split(/\s+/)
patterns = [parts.shift]
values = []
parts.each do | part |
case part
when /^(-?(?:(?:0x[0-9a-fA-F]+)|(?:\d+)))$/
patterns << "#"
values << $1.to_i(0)
when /^([a-zA-Z_][a-zA-Z0-9_]+)$/
throw "unknown label #{$1}" unless $labels.member?($1)
patterns << "#"
values << $labels[$1]
when /^\$(-?(?:(?:0x[0-9a-fA-F]+)|(?:\d+)))$/
patterns << "$"
values << $1.to_i(0)
when /^\[(-?(?:(?:0x[0-9a-fA-F]+)|(?:\d+)))\]$/
patterns << "[#]"
values << $1.to_i(0)
when /^\[([a-zA-Z_][a-zA-Z0-9_]+)\]$/
throw "unknown label #{$1}" unless $labels.member?($1)
patterns << "[#]"
values << $labels[$1]
when /^\[\$(-?(?:(?:0x[0-9a-fA-F]+)|(?:\d+)))\]$/
patterns << "[$]"
values << $1.to_i(0)
else
throw "invalid part #{part}"
end
end
pattern = patterns.join(" ")
throw "unknown instruction pattern #{pattern}" unless $insts.member?(pattern)
opcode = $insts[pattern]
# Encoding format:
# +-+-+-+-+-+-+-+-+
# |M|I|SEL| SHIFT |
# +-+-+-+-+-+-+-+-+
# M = More data after this
# I = Invert this field before shifting
# SEL = Field selector (0=opcode, 2=A, 3=B)
# SHIFT = Data to shift in
# This gives us these common first nibbles:
# 0 last opcode byte
# 8 extended opcode byte
# A operand A byte
# B operand B byte
# E operand A byte (with inversion)
# F operand B byte (with inversion)
space = false
values.each_with_index do | value, idx |
inverted = value < 0
if inverted
value *= -1
value -= 1
end
nibbles = []
while value != 0
nibbles << (value & 0xf).to_s(16)
value = value >> 4
end
if inverted and nibbles.empty?
nibbles << "f"
end
nibbles.reverse!
if idx == 0
if inverted
$stdout.write(" ") if space
$stdout.write("e#{nibbles.shift}")
$pc += 1
space = true
end
nibbles.each do | nibble |
$stdout.write(" ") if space
$stdout.write("a#{nibble}")
$pc += 1
space = true
end
elsif idx == 1
if inverted
$stdout.write(" ") if space
$stdout.write("f#{nibbles.shift}")
$pc += 1
space = true
end
nibbles.each do | nibble |
$stdout.write(" ") if space
$stdout.write("b#{nibble}")
$pc += 1
space = true
end
else
throw "don't know how to encode this many fields"
end
end
nibbles = []
while opcode != 0
nibbles << (opcode & 0xf).to_s(16)
opcode = opcode >> 4
end
nibbles << "0" if nibbles.empty?
last = nibbles.shift
nibbles.reverse!
nibbles.each do | nibble |
$stdout.write(" ") if space
$stdout.write("8#{nibble}")
$pc += 1
space = true
end
$stdout.write(" ") if space
$stdout.write("0#{last}\t// #{line}\n")
$pc += 1
end
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