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comparison python/asm.py @ 218:494828a7adf1

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added some sort of cache to assembler
author Windel Bouwman
date Fri, 05 Jul 2013 15:30:22 +0200
parents 003c8a976fff
children 1fa3e0050b49
comparison
equal deleted inserted replaced
217:8b2e5f3cd579 218:494828a7adf1
64 return t 64 return t
65 @property 65 @property
66 def Peak(self): 66 def Peak(self):
67 return self.curTok 67 return self.curTok
68 68
69 69 class Parser:
70 class Assembler: 70 def __init__(self):
71 def __init__(self, target=None):
72 self.target = target
73 self.restart()
74 # Construct a parser given a grammar: 71 # Construct a parser given a grammar:
75 ident = lambda x: x # Identity helper function 72 ident = lambda x: x # Identity helper function
76 g = pyyacc.Grammar(['ID', 'NUMBER', ',', '[', ']', ':', '+', '-', '*', pyyacc.EPS, 'COMMENT', '{', '}']) 73 g = pyyacc.Grammar(['ID', 'NUMBER', ',', '[', ']', ':', '+', '-', '*', pyyacc.EPS, 'COMMENT', '{', '}'])
77 g.add_production('asmline', ['asmline2']) 74 g.add_production('asmline', ['asmline2'])
78 g.add_production('asmline', ['asmline2', 'COMMENT']) 75 g.add_production('asmline', ['asmline2', 'COMMENT'])
134 lab = ALabel(lname) 131 lab = ALabel(lname)
135 self.emit(lab) 132 self.emit(lab)
136 def p_binop(self, exp1, op, exp2): 133 def p_binop(self, exp1, op, exp2):
137 return ABinop(op, exp1, exp2) 134 return ABinop(op, exp1, exp2)
138 135
136 def parse(self, tokens, emitter):
137 self.emit = emitter
138 self.p.parse(tokens)
139
140 asmParser = Parser()
141 class Assembler:
142 def __init__(self, target=None):
143 self.target = target
144 self.restart()
145 self.p = asmParser
146
139 # Top level interface: 147 # Top level interface:
140 def restart(self): 148 def restart(self):
141 self.output = [] 149 self.output = []
142 self.binout = bytearray() 150 self.binout = bytearray()
143 self.current_section = '.text' 151 self.current_section = '.text'
149 # TODO 157 # TODO
150 158
151 def parse_line(self, line): 159 def parse_line(self, line):
152 """ Parse line into asm AST """ 160 """ Parse line into asm AST """
153 tokens = tokenize(line) 161 tokens = tokenize(line)
154 self.p.parse(tokens) 162 self.p.parse(tokens, self.emit)
155 163
156 def assemble(self, asmsrc): 164 def assemble(self, asmsrc):
157 """ Assemble this source snippet """ 165 """ Assemble this source snippet """
158 for line in asmsrc.split('\n'): 166 for line in asmsrc.split('\n'):
159 self.assemble_line(line) 167 self.assemble_line(line)