Removed useless generator file.

src/generate_grammar.py

-#!/usr/bin/python
-argmap ={'REG': 'WORD'}
-
-def command(name, args):
-    """Generate grammar code to be pasted in grammar.y for a sinle MIPS
-    command."""
-    argc = len(args)
-    mapped_args = [argmap[arg] if arg in argmap else arg for arg in args]
-    code = '"%s" %s {\n' % (name, ' COMMA '.join(mapped_args))
-    code += '\t\tchar **argv = (char **)malloc(%d * sizeof(char *));\n' % argc
-    code += '\t\tint *argt = (int *)malloc(%d * sizeof(int));\n' % argc
-
-    for i, argtype in enumerate(args):
-        code += '\t\targv[%d] = $%d;\n' % (i, i * 2 + 2)
-        code += '\t\targt[%d] = ARG_%s;\n' % (i, argtype)
-
-    code += '\t\tadd_line(TYPE_CMD, %s, %d, argv, argt);\n' % (name, argc)
-    code += '\t}\n'
-
-    return code
-
-# Define commands
-commands = [ \
-            (['add', 'sub'], ['REG'] * 3), \
-            (['addi', 'subi'], ['REG', 'REG', 'INT']), \
-        ]
-
-# Generate 'command' grammar
-cmd = []
-
-for names, args in commands:
-    for name in names:
-        cmd.append(command(name, args))
-
-code = 'commands:\n\t%s\t;\n' % '\t| '.join(cmd)
-
-print code