1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
|
from dataclasses import dataclass
from functools import singledispatch
from typing import List
from .ast import ImplementationFile, FunctionDefinition, ExpressionStatement, FunctionCallExpression, \
VariableExpression, ConstantExpression, ReturnStatement, BasicType, IfStatement, ComparisonExpression, AddExpression
@dataclass
class SsaResult:
data: List[str]
code: List[str]
def __add__(self, other: 'SsaResult') -> 'SsaResult':
if not isinstance(other, SsaResult):
return NotImplemented
return SsaResult(self.data + other.data, self.code + other.code)
def __radd__(self, other: 'SsaResult'):
if not isinstance(other, SsaResult):
return NotImplemented
self.data += other.data
self.code += other.code
@dataclass
class CompileContext:
next_data: int = 0
next_temp: int = 0
next_label: int = 0
def build_ssa(file: ImplementationFile) -> str:
result = compile_to_ssa(file, CompileContext())
data = '\n'.join(result.data)
code = '\n'.join(result.code)
return data + '\n\n' + code
@singledispatch
def compile_to_ssa(target, context: CompileContext) -> SsaResult:
raise NotImplementedError('unannotated compile on ' + str(type(target)))
@compile_to_ssa.register
def _(target: ImplementationFile, context: CompileContext):
result = SsaResult([], [])
for target in target.contents:
result += compile_to_ssa(target, context)
return result
@compile_to_ssa.register
def _(target: FunctionDefinition, context: CompileContext) -> SsaResult:
result = SsaResult([], [])
for statement in target.body:
result += compile_to_ssa(statement, context)
code = [' ' + instr for instr in result.code]
assert len(target.args) == 0
assert target.return_type == BasicType('int32')
code = [f"export function w ${target.name}() {{", "@start", *code, "}"]
return SsaResult(result.data, code)
@compile_to_ssa.register
def _(target: ExpressionStatement, context: CompileContext) -> SsaResult:
return compile_to_ssa(target.body, context)
@compile_to_ssa.register
def _(target: FunctionCallExpression, context: CompileContext) -> SsaResult:
assert isinstance(target.function, VariableExpression)
result = SsaResult([], [])
args = []
for i, expr in enumerate(target.arguments):
result += compile_to_ssa(expr, context)
arg_dest = context.next_temp - 1
args += [f"l %t{arg_dest}"]
result.code.append(f"call ${target.function.name}({','.join(args)}, ...)")
return result
@compile_to_ssa.register
def _(target: ConstantExpression, context: CompileContext) -> SsaResult:
if target.value.startswith('"'):
data_dest = context.next_data
context.next_data += 1
data = [f"data $data{data_dest} = {{ b {target.value}, b 0 }}"]
temp = context.next_temp
context.next_temp += 1
code = [f"%t{temp} =l copy $data{data_dest}"]
else:
assert not target.value.startswith('0b')
assert not target.value.startswith('0B')
assert not target.value.startswith('0o')
assert not target.value.startswith('0x')
assert not target.value.startswith('0X')
assert not target.value.startswith('0f')
assert not target.value.startswith('0F')
assert '.' not in target.value
assert not target.value.startswith("'")
data = []
temp = context.next_temp
context.next_temp += 1
code = [f"%t{temp} =w copy {target.value}"]
return SsaResult(data, code)
@compile_to_ssa.register
def _(target: ReturnStatement, context: CompileContext) -> SsaResult:
if target.body is None:
return SsaResult([], ['ret'])
result = compile_to_ssa(target.body, context)
ret_val_dest = context.next_temp - 1
result.code.append(f"ret %t{ret_val_dest}")
return result
@compile_to_ssa.register
def _(target: IfStatement, context: CompileContext) -> SsaResult:
result = compile_to_ssa(target.condition, context)
condition_dest = context.next_temp - 1
true_label = context.next_label
context.next_label += 1
false_label = context.next_label
context.next_label += 1
after_label = context.next_label
context.next_label += 1
result.code.append(f"jnz %t{condition_dest}, @l{true_label}, @l{false_label}")
result.code.append(f"@l{true_label}")
for statement in target.then:
result += compile_to_ssa(statement, context)
result.code.append(f"jmp @l{after_label}")
result.code.append(f"@l{false_label}")
for statement in target.els:
result += compile_to_ssa(statement, context)
result.code.append(f"jmp @l{after_label}")
result.code.append(f"@l{after_label}")
return result
@compile_to_ssa.register
def _(target: ComparisonExpression, context: CompileContext) -> SsaResult:
result = compile_to_ssa(target.value1, context)
value1_dest = context.next_temp - 1
result += compile_to_ssa(target.value2, context)
value2_dest = context.next_temp - 1
result_dest = context.next_temp
context.next_temp += 1
if target.op == '==':
result.code.append(f"%t{result_dest} =w ceq %t{value1_dest}, %t{value2_dest}")
else:
raise NotImplementedError('comparison ' + target.op)
return result
@compile_to_ssa.register
def _(target: AddExpression, context: CompileContext) -> SsaResult:
result = compile_to_ssa(target.term1, context)
value1_dest = context.next_temp - 1
result += compile_to_ssa(target.term2, context)
value2_dest = context.next_temp - 1
result_reg = context.next_temp
context.next_temp += 1
# TODO make sure the types are correct
result.code.append(f"%t{result_reg} =w add %t{value1_dest}, %t{value2_dest}")
return result
@compile_to_ssa.register
def _(target: VariableExpression, context: CompileContext) -> SsaResult:
# TODO make sure any of this is reasonable
result = context.next_temp
context.next_temp += 1
return SsaResult([], [f"%t{result} =w copy %{target.name}"])
|
