Mercurial > lcfOS
annotate python/ppci/target/basetarget.py @ 364:c49459768aaa
Work on globals
| author | Windel Bouwman |
|---|---|
| date | Wed, 19 Mar 2014 20:24:03 +0100 |
| parents | 396e5cefba13 |
| children | 39bf68bf1891 |
| rev | line source |
|---|---|
| 362 | 1 import types |
| 200 | 2 from ppci import CompilerError |
| 199 | 3 |
| 4 """ | |
| 5 Base classes for defining a target | |
| 6 """ | |
| 7 | |
| 234 | 8 class Instruction: |
| 292 | 9 """ Base instruction class """ |
| 234 | 10 def encode(self): |
| 335 | 11 return bytes() |
| 292 | 12 |
| 335 | 13 def relocations(self): |
| 14 return [] | |
| 15 | |
| 16 def symbols(self): | |
| 17 return [] | |
| 234 | 18 |
| 19 | |
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20 class Nop(Instruction): |
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21 """ Instruction that does nothing and has zero size """ |
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22 def encode(self): |
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23 return bytes() |
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24 |
| 354 | 25 def __repr__(self): |
| 26 return 'NOP' | |
| 27 | |
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28 |
| 234 | 29 class PseudoInstruction(Instruction): |
| 30 pass | |
| 31 | |
| 32 | |
| 33 class Label(PseudoInstruction): | |
| 206 | 34 def __init__(self, name): |
| 35 self.name = name | |
| 36 | |
| 235 | 37 def __repr__(self): |
| 38 return '{}:'.format(self.name) | |
| 39 | |
| 335 | 40 def symbols(self): |
| 41 return [self.name] | |
| 235 | 42 |
| 43 | |
| 234 | 44 class Comment(PseudoInstruction): |
| 45 def __init__(self, txt): | |
| 46 self.txt = txt | |
| 249 | 47 |
| 235 | 48 def encode(self): |
| 49 return bytes() | |
| 249 | 50 |
| 234 | 51 def __repr__(self): |
| 52 return '; {}'.format(self.txt) | |
| 53 | |
| 235 | 54 |
| 234 | 55 class Alignment(PseudoInstruction): |
| 56 def __init__(self, a): | |
| 57 self.align = a | |
| 235 | 58 |
| 59 def __repr__(self): | |
| 60 return 'ALIGN({})'.format(self.align) | |
| 61 | |
| 234 | 62 def encode(self): |
| 63 pad = [] | |
| 335 | 64 # TODO |
| 65 address = 0 | |
| 235 | 66 while (address % self.align) != 0: |
| 234 | 67 address += 1 |
| 68 pad.append(0) | |
| 69 return bytes(pad) | |
| 70 | |
| 292 | 71 |
| 346 | 72 class Register: |
| 199 | 73 def __init__(self, name): |
| 74 self.name = name | |
| 75 | |
| 76 | |
| 364 | 77 class LabelAddress: |
| 78 def __init__(self, name): | |
| 79 self.name = name | |
| 80 | |
| 81 | |
| 199 | 82 class Target: |
| 201 | 83 def __init__(self, name, desc=''): |
| 84 self.name = name | |
| 85 self.desc = desc | |
| 200 | 86 self.registers = [] |
| 341 | 87 self.byte_sizes = {'int' : 4} # For front end! |
| 354 | 88 self.byte_sizes['byte'] = 1 |
| 341 | 89 |
| 346 | 90 # For lowering: |
| 91 self.lower_functions = {} | |
| 92 | |
| 341 | 93 # For assembler: |
| 94 self.assembler_rules = [] | |
| 95 self.asm_keywords = [] | |
| 96 | |
| 346 | 97 self.generate_base_rules() |
| 98 | |
| 99 def generate_base_rules(self): | |
| 345 | 100 # Base rules for constants: |
| 101 self.add_rule('imm32', ['val32'], lambda x: x[0].val) | |
| 102 self.add_rule('imm32', ['imm16'], lambda x: x[0]) | |
| 103 | |
| 104 self.add_rule('imm16', ['val16'], lambda x: x[0].val) | |
| 105 self.add_rule('imm16', ['imm12'], lambda x: x[0]) | |
| 106 | |
| 107 self.add_rule('imm12', ['val12'], lambda x: x[0].val) | |
| 108 self.add_rule('imm12', ['imm8'], lambda x: x[0]) | |
| 109 | |
| 110 self.add_rule('imm8', ['val8'], lambda x: x[0].val) | |
| 111 self.add_rule('imm8', ['imm5'], lambda x: x[0]) | |
| 112 | |
| 113 self.add_rule('imm5', ['val5'], lambda x: x[0].val) | |
| 114 self.add_rule('imm5', ['imm3'], lambda x: x[0]) | |
| 115 | |
| 116 self.add_rule('imm3', ['val3'], lambda x: x[0].val) | |
| 117 | |
| 341 | 118 def add_keyword(self, kw): |
| 119 self.asm_keywords.append(kw) | |
| 120 | |
| 121 def add_instruction(self, rhs, f): | |
| 122 self.add_rule('instruction', rhs, f) | |
| 123 | |
| 124 def add_rule(self, lhs, rhs, f): | |
| 362 | 125 if type(f) is int: |
| 126 f2 = lambda x: f | |
| 127 else: | |
| 128 f2 = f | |
| 129 assert type(f2) is types.FunctionType | |
| 130 self.assembler_rules.append((lhs, rhs, f2)) | |
| 200 | 131 |
| 346 | 132 def lower_frame_to_stream(self, frame, outs): |
| 133 """ Lower instructions from frame to output stream """ | |
| 134 for im in frame.instructions: | |
| 135 if isinstance(im.assem, Instruction): | |
| 136 outs.emit(im.assem) | |
| 137 else: | |
| 138 ins = self.lower_functions[im.assem](im) | |
| 139 outs.emit(ins) | |
| 201 | 140 |
| 346 | 141 def add_lowering(self, cls, f): |
| 142 """ Add a function to the table of lowering options for this target """ | |
| 143 self.lower_functions[cls] = f |