Mercurial > lcfOS
annotate python/ppci/target/basetarget.py @ 360:42343d189e14
Bugfix in for loop
| author | Windel Bouwman |
|---|---|
| date | Fri, 14 Mar 2014 16:11:32 +0100 |
| parents | 5477e499b039 |
| children | c05ab629976a |
| rev | line source |
|---|---|
| 200 | 1 from ppci import CompilerError |
| 199 | 2 |
| 3 """ | |
| 4 Base classes for defining a target | |
| 5 """ | |
| 6 | |
| 234 | 7 class Instruction: |
| 292 | 8 """ Base instruction class """ |
| 234 | 9 def encode(self): |
| 335 | 10 return bytes() |
| 292 | 11 |
| 335 | 12 def relocations(self): |
| 13 return [] | |
| 14 | |
| 15 def symbols(self): | |
| 16 return [] | |
| 234 | 17 |
| 18 | |
|
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19 class Nop(Instruction): |
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20 """ Instruction that does nothing and has zero size """ |
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21 def encode(self): |
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22 return bytes() |
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23 |
| 354 | 24 def __repr__(self): |
| 25 return 'NOP' | |
| 26 | |
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27 |
| 234 | 28 class PseudoInstruction(Instruction): |
| 29 pass | |
| 30 | |
| 31 | |
| 32 class Label(PseudoInstruction): | |
| 206 | 33 def __init__(self, name): |
| 34 self.name = name | |
| 35 | |
| 235 | 36 def __repr__(self): |
| 37 return '{}:'.format(self.name) | |
| 38 | |
| 335 | 39 def symbols(self): |
| 40 return [self.name] | |
| 235 | 41 |
| 42 | |
| 234 | 43 class Comment(PseudoInstruction): |
| 44 def __init__(self, txt): | |
| 45 self.txt = txt | |
| 249 | 46 |
| 235 | 47 def encode(self): |
| 48 return bytes() | |
| 249 | 49 |
| 234 | 50 def __repr__(self): |
| 51 return '; {}'.format(self.txt) | |
| 52 | |
| 235 | 53 |
| 234 | 54 class Alignment(PseudoInstruction): |
| 55 def __init__(self, a): | |
| 56 self.align = a | |
| 235 | 57 |
| 58 def __repr__(self): | |
| 59 return 'ALIGN({})'.format(self.align) | |
| 60 | |
| 234 | 61 def encode(self): |
| 62 pad = [] | |
| 335 | 63 # TODO |
| 64 address = 0 | |
| 235 | 65 while (address % self.align) != 0: |
| 234 | 66 address += 1 |
| 67 pad.append(0) | |
| 68 return bytes(pad) | |
| 69 | |
| 292 | 70 |
| 249 | 71 class DebugInfo(PseudoInstruction): |
| 72 def __init__(self, i): | |
| 73 self.info = i | |
| 74 | |
| 75 def __repr__(self): | |
| 76 return 'DebugInfo: {}'.format(self.info) | |
| 77 | |
| 292 | 78 |
| 346 | 79 class Register: |
| 199 | 80 def __init__(self, name): |
| 81 self.name = name | |
| 82 | |
| 83 | |
| 84 class Target: | |
| 201 | 85 def __init__(self, name, desc=''): |
| 86 self.name = name | |
| 87 self.desc = desc | |
| 200 | 88 self.registers = [] |
| 341 | 89 self.byte_sizes = {'int' : 4} # For front end! |
| 354 | 90 self.byte_sizes['byte'] = 1 |
| 341 | 91 |
| 346 | 92 # For lowering: |
| 93 self.lower_functions = {} | |
| 94 | |
| 341 | 95 # For assembler: |
| 96 self.assembler_rules = [] | |
| 97 self.asm_keywords = [] | |
| 98 | |
| 346 | 99 self.generate_base_rules() |
| 100 | |
| 101 def generate_base_rules(self): | |
| 345 | 102 # Base rules for constants: |
| 103 self.add_rule('imm32', ['val32'], lambda x: x[0].val) | |
| 104 self.add_rule('imm32', ['imm16'], lambda x: x[0]) | |
| 105 | |
| 106 self.add_rule('imm16', ['val16'], lambda x: x[0].val) | |
| 107 self.add_rule('imm16', ['imm12'], lambda x: x[0]) | |
| 108 | |
| 109 self.add_rule('imm12', ['val12'], lambda x: x[0].val) | |
| 110 self.add_rule('imm12', ['imm8'], lambda x: x[0]) | |
| 111 | |
| 112 self.add_rule('imm8', ['val8'], lambda x: x[0].val) | |
| 113 self.add_rule('imm8', ['imm5'], lambda x: x[0]) | |
| 114 | |
| 115 self.add_rule('imm5', ['val5'], lambda x: x[0].val) | |
| 116 self.add_rule('imm5', ['imm3'], lambda x: x[0]) | |
| 117 | |
| 118 self.add_rule('imm3', ['val3'], lambda x: x[0].val) | |
| 119 | |
| 341 | 120 def add_keyword(self, kw): |
| 121 self.asm_keywords.append(kw) | |
| 122 | |
| 123 def add_instruction(self, rhs, f): | |
| 124 self.add_rule('instruction', rhs, f) | |
| 125 | |
| 126 def add_rule(self, lhs, rhs, f): | |
| 127 self.assembler_rules.append((lhs, rhs, f)) | |
| 200 | 128 |
| 346 | 129 def lower_frame_to_stream(self, frame, outs): |
| 130 """ Lower instructions from frame to output stream """ | |
| 131 for im in frame.instructions: | |
| 132 if isinstance(im.assem, Instruction): | |
| 133 outs.emit(im.assem) | |
| 134 else: | |
| 135 ins = self.lower_functions[im.assem](im) | |
| 136 outs.emit(ins) | |
| 201 | 137 |
| 346 | 138 def add_lowering(self, cls, f): |
| 139 """ Add a function to the table of lowering options for this target """ | |
| 140 self.lower_functions[cls] = f |