Mercurial > lcfOS
annotate python/target/basetarget.py @ 290:7b38782ed496
File moves
| author | Windel Bouwman |
|---|---|
| date | Sun, 24 Nov 2013 11:24:15 +0100 |
| parents | python/target.py@02385f62f250 |
| children | 534b94b40aa8 |
| rev | line source |
|---|---|
| 235 | 1 from asmnodes import ASymbol, AInstruction, ANumber |
| 200 | 2 from ppci import CompilerError |
| 199 | 3 |
| 4 """ | |
| 5 Base classes for defining a target | |
| 6 """ | |
| 7 | |
| 8 # Machine code interface: | |
| 9 class Operand: | |
| 10 """ Single machine operand """ | |
| 11 pass | |
| 12 | |
| 206 | 13 # standard immediates: |
| 14 | |
| 15 class Imm8: | |
| 16 def __init__(self, imm): | |
| 17 assert imm < 256 | |
| 18 self.imm = imm | |
| 19 | |
| 20 @classmethod | |
| 21 def Create(cls, vop): | |
| 22 if type(vop) is ANumber and vop.number < 256: | |
| 23 return cls(vop.number) | |
| 234 | 24 |
| 275 | 25 class Imm7: |
| 26 def __init__(self, imm): | |
| 27 assert imm < 128 | |
| 28 self.imm = imm | |
| 29 | |
| 30 @classmethod | |
| 31 def Create(cls, vop): | |
| 32 if type(vop) is ANumber and vop.number < 128: | |
| 33 return cls(vop.number) | |
| 34 | |
| 206 | 35 class Imm3: |
| 36 def __init__(self, imm): | |
| 37 assert imm < 8 | |
| 38 assert type(imm) is int | |
| 39 self.imm = imm | |
| 40 | |
| 41 @classmethod | |
| 42 def Create(cls, vop): | |
| 43 if type(vop) is ANumber and vop.number < 8: | |
| 44 return cls(vop.number) | |
| 45 | |
| 235 | 46 class Imm32: |
| 47 def __init__(self, imm): | |
| 48 assert imm < 2**32 | |
| 49 assert type(imm) is int | |
| 50 self.imm = imm | |
| 51 | |
| 52 @classmethod | |
| 53 def Create(cls, vop): | |
| 54 if type(vop) is ANumber and vop.number < 2**32: | |
| 55 return cls(vop.number) | |
| 56 | |
| 57 | |
| 58 class LabelRef: | |
| 59 def __init__(self, name): | |
|
280
02385f62f250
Rework from str interface to Instruction interface
Windel Bouwman
parents:
277
diff
changeset
|
60 assert type(name) is str |
| 235 | 61 self.name = name |
| 62 | |
| 63 @classmethod | |
| 64 def Create(cls, vop): | |
| 65 if type(vop) is ASymbol: | |
| 66 return cls(vop.name) | |
| 67 | |
| 234 | 68 class Instruction: |
| 69 def encode(self): | |
| 70 raise NotImplementedError('Instruction {0} has no encode yet, TODO'.format(type(self))) | |
| 71 def resolve(self, f): | |
| 72 pass | |
| 73 | |
| 74 | |
|
280
02385f62f250
Rework from str interface to Instruction interface
Windel Bouwman
parents:
277
diff
changeset
|
75 class Nop(Instruction): |
|
02385f62f250
Rework from str interface to Instruction interface
Windel Bouwman
parents:
277
diff
changeset
|
76 """ Instruction that does nothing and has zero size """ |
|
02385f62f250
Rework from str interface to Instruction interface
Windel Bouwman
parents:
277
diff
changeset
|
77 def encode(self): |
|
02385f62f250
Rework from str interface to Instruction interface
Windel Bouwman
parents:
277
diff
changeset
|
78 return bytes() |
|
02385f62f250
Rework from str interface to Instruction interface
Windel Bouwman
parents:
277
diff
changeset
|
79 |
|
02385f62f250
Rework from str interface to Instruction interface
Windel Bouwman
parents:
277
diff
changeset
|
80 |
|
02385f62f250
Rework from str interface to Instruction interface
Windel Bouwman
parents:
277
diff
changeset
|
81 |
| 234 | 82 class PseudoInstruction(Instruction): |
| 83 pass | |
| 84 | |
| 85 | |
| 86 class Label(PseudoInstruction): | |
| 206 | 87 def __init__(self, name): |
| 88 self.name = name | |
| 234 | 89 self.address = 0 |
| 206 | 90 |
| 235 | 91 def __repr__(self): |
| 92 return '{}:'.format(self.name) | |
| 93 | |
| 94 def encode(self): | |
| 95 return bytes() | |
| 96 | |
| 206 | 97 @classmethod |
| 98 def Create(cls, vop): | |
| 99 if type(vop) is ASymbol: | |
| 100 name = vop.name | |
| 101 return cls(name) | |
| 102 | |
| 235 | 103 |
| 234 | 104 class Comment(PseudoInstruction): |
| 105 def __init__(self, txt): | |
| 106 self.txt = txt | |
| 249 | 107 |
| 235 | 108 def encode(self): |
| 109 return bytes() | |
| 249 | 110 |
| 234 | 111 def __repr__(self): |
| 112 return '; {}'.format(self.txt) | |
| 113 | |
| 235 | 114 |
| 234 | 115 class Alignment(PseudoInstruction): |
| 116 def __init__(self, a): | |
| 117 self.align = a | |
| 235 | 118 |
| 119 def __repr__(self): | |
| 120 return 'ALIGN({})'.format(self.align) | |
| 121 | |
| 234 | 122 def encode(self): |
| 123 pad = [] | |
| 124 address = self.address | |
| 235 | 125 while (address % self.align) != 0: |
| 234 | 126 address += 1 |
| 127 pad.append(0) | |
| 128 return bytes(pad) | |
| 129 | |
| 249 | 130 class DebugInfo(PseudoInstruction): |
| 131 def __init__(self, i): | |
| 132 self.info = i | |
| 133 | |
| 134 def __repr__(self): | |
| 135 return 'DebugInfo: {}'.format(self.info) | |
| 136 | |
| 137 def encode(self): | |
| 138 return bytes() | |
| 234 | 139 |
| 199 | 140 class Register(Operand): |
| 141 def __init__(self, name): | |
| 142 self.name = name | |
| 143 | |
| 144 | |
| 145 class Target: | |
| 201 | 146 def __init__(self, name, desc=''): |
| 147 self.name = name | |
| 148 self.desc = desc | |
| 200 | 149 self.registers = [] |
| 199 | 150 self.instructions = [] |
| 200 | 151 |
| 201 | 152 def instruction(self, cls): |
| 153 """ Decorator function that registers an instruction to this target """ | |
| 202 | 154 self.addInstruction(cls) |
| 201 | 155 return cls |
| 156 | |
| 206 | 157 def check(self): |
| 158 """ Check target """ | |
| 159 for i in self.instructions: | |
| 160 assert hasattr(i, 'mnemonic') | |
| 161 assert hasattr(i, 'operands'), str(i) | |
| 162 assert type(i.mnemonic) is str | |
| 163 assert type(i.operands) is tuple, str(i) | |
| 164 | |
| 202 | 165 def addInstruction(self, ins_class): |
| 166 self.instructions.append(ins_class) | |
| 167 | |
| 200 | 168 def mapOperand(self, operand): |
| 169 """ Try to map an operand to a target type """ | |
| 170 if type(operand) is ASymbol: | |
| 171 # Try to map to register: | |
| 172 regs = {} | |
| 173 for r in self.registers: | |
| 174 regs[r.name] = r | |
| 175 if operand.name in regs: | |
| 176 return regs[operand.name] | |
| 201 | 177 raise CompilerError('Cannot map {0}'.format(operand)) |
| 199 | 178 |
| 200 | 179 def mapInstruction(self, vi): |
| 203 | 180 assert type(vi) is AInstruction |
| 200 | 181 """ Map ast tree to real instruction for this target """ |
| 199 | 182 |
| 200 | 183 # map to real operands: |
| 236 | 184 if vi.mnemonic.upper() == 'ALIGN' and len(vi.operands) == 1: |
| 185 if type(vi.operands[0]) == ANumber: | |
| 186 return Alignment(vi.operands[0].number) | |
| 200 | 187 |
| 188 # look for a suitable instruction | |
| 189 for ic in self.instructions: | |
| 219 | 190 if ic.mnemonic.upper() == vi.mnemonic.upper() and len(ic.operands) == len(vi.operands): |
| 203 | 191 # Try to map operands to the correct operand types: |
| 192 rops = [roptype.Create(vop) for roptype, vop in zip(ic.operands, vi.operands)] | |
| 193 | |
| 194 # Check if we succeeded: | |
| 277 | 195 if all(isinstance(rop, optype) for rop, optype in zip(rops, ic.operands)): |
| 203 | 196 return ic(*rops) |
| 201 | 197 raise CompilerError('No suitable instruction found for "{0}"'.format(vi)) |
| 200 | 198 |