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comparison python/target/x86.py @ 290:7b38782ed496

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author Windel Bouwman
date Sun, 24 Nov 2013 11:24:15 +0100
parents python/x86.py@6b2bec5653f1
children
comparison
equal deleted inserted replaced
289:bd2593de3ff8 290:7b38782ed496
1 import ppci
2 import ir
3
4 class X86CodeGenSimple:
5 """
6 Inefficient code generation, assume stack machine
7 backend
8 """
9 def __init__(self, diag):
10 self.diag = diag
11
12 def emit(self, i):
13 self.asm.append(i)
14
15 def genBin(self, ir):
16 self.asm = []
17 self.genModule(ir)
18 return self.asm
19
20 def genModule(self, ir):
21 for f in ir.Functions:
22 self.genFunction(f)
23 def genFunction(self, f):
24 self.emit('global {0}'.format(f.name))
25 self.emit('{0}:'.format(f.name))
26 self.emit('jmp {0}'.format(f.entry.name))
27 for bb in f.BasicBlocks:
28 self.genBB(bb)
29 def genBB(self, bb):
30 self.emit('{0}:'.format(bb.name))
31 for i in bb.Instructions:
32 self.genIns(i)
33 def genIns(self, i):
34 if type(i) is ir.BinaryOperator:
35 ops = {'+':'add', '-':'sub', '*':'mul'}
36 if i.operation in ops:
37 i.result.reg = 'rax'
38 i.value1.reg = 'rbx'
39 i.value2.reg = 'rbx'
40 self.emit('mov {0}, {1}'.format(i.result.reg, i.value1.reg))
41 self.emit('{0} {1}, {2}'.format(ops[i.operation], i.result.reg, i.value2.reg))
42 else:
43 raise NotImplementedError('op {0}'.format(i.operation))
44 elif type(i) is ir.Load:
45 self.emit('mov {0}, [{1}]'.format(i.value, i.location))
46 elif type(i) is ir.Return:
47 self.emit('ret')
48 elif type(i) is ir.Call:
49 self.emit('call')
50 elif type(i) is ir.ImmLoad:
51 self.emit('mov {0}, {1}'.format(i.target, i.value))
52 elif type(i) is ir.Store:
53 self.emit('mov [{0}], {1}'.format(i.location, i.value))
54 elif type(i) is ir.ConditionalBranch:
55 self.emit('cmp {0}, {1}'.format(i.a, i.b))
56 jmps = {'>':'jg', '<':'jl', '==':'je'}
57 if i.cond in jmps:
58 j = jmps[i.cond]
59 self.emit('{0} {1}'.format(j, i.lab1.name))
60 else:
61 raise NotImplementedError('condition {0}'.format(i.cond))
62 self.emit('jmp {0}'.format(i.lab2.name))
63 elif type(i) is ir.Branch:
64 self.emit('jmp {0}'.format(i.target.name))
65 elif type(i) is ir.Alloc:
66 pass
67 else:
68 raise NotImplementedError('{0}'.format(i))
69