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codegen_c.py
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import attrs
import ir
ir.generate_asdl_file()
import _asdl.loma as loma_ir
import irvisitor
import compiler
def type_to_string(node : loma_ir.type | loma_ir.arg) -> str:
""" Given a loma type, return a string that represents
the type in C.
"""
match node:
case loma_ir.Arg():
if isinstance(node.t, loma_ir.Array):
return type_to_string(node.t)
else:
return type_to_string(node.t) + ('*' if node.i == loma_ir.Out() else '')
case loma_ir.Int():
return 'int'
case loma_ir.Float():
return 'float'
case loma_ir.Array():
return type_to_string(node.t) + '*'
case loma_ir.Struct():
return node.id
case None:
return 'void'
case _:
assert False
@attrs.define()
class CCodegenVisitor(irvisitor.IRVisitor):
""" Generates C code from loma IR.
"""
code = ''
tab_count = 0
funcs_defs = None
def __init__(self, func_defs):
self.func_defs = func_defs
def emit_tabs(self):
self.code += '\t' * self.tab_count
def visit_function_def(self, node):
self.code += f'{type_to_string(node.ret_type)} {node.id}('
for i, arg in enumerate(node.args):
if i > 0:
self.code += ', '
self.code += f'{type_to_string(arg)} {arg.id}'
if node.is_simd:
if len(node.args) > 0:
self.code += ', '
self.code += 'int __total_work'
self.code += ') {\n'
self.byref_args = set([arg.id for arg in node.args if \
arg.i == loma_ir.Out() and (not isinstance(arg.t, loma_ir.Array))])
self.tab_count += 1
if node.is_simd:
self.emit_tabs()
self.code += 'for (int __work_id = 0; __work_id < __total_work; __work_id++) {\n'
self.tab_count += 1
for stmt in node.body:
self.visit_stmt(stmt)
if node.is_simd:
self.tab_count -= 1
self.emit_tabs()
self.code += '}\n'
self.tab_count -= 1
self.code += '}\n'
def visit_return(self, node):
self.emit_tabs()
self.code += f'return {self.visit_expr(node.val)};\n'
def init_zero(self, id, t, depth = 0):
# Initiailize the declared variable to zero
if isinstance(t, loma_ir.Int) or isinstance(t, loma_ir.Float):
self.emit_tabs()
self.code += f'{id} = 0;\n'
elif isinstance(t, loma_ir.Struct):
for m in t.members:
self.init_zero(id + '.' + m.id, m.t, depth)
elif isinstance(t, loma_ir.Array):
self.emit_tabs()
iter_var_name = 'i'
self.code += f'for (int _{iter_var_name * (depth + 1)} = 0;' + \
f' _{iter_var_name * (depth + 1)} < {t.static_size};' + \
f'_{iter_var_name * (depth + 1)}++) {{\n'
self.tab_count += 1
self.init_zero(id + f'[_{iter_var_name * (depth + 1)}]', t.t, depth + 1)
self.tab_count -= 1
self.emit_tabs()
self.code += '}\n'
def visit_declare(self, node):
self.emit_tabs()
if not isinstance(node.t, loma_ir.Array):
self.code += f'{type_to_string(node.t)} {node.target}'
else:
# Special rule for arrays
assert node.t.static_size != None
self.code += f'{type_to_string(node.t.t)} {node.target}[{node.t.static_size}]'
if node.val is not None:
self.code += f' = {self.visit_expr(node.val)};\n'
else:
self.code += ';\n'
self.init_zero(node.target, node.t)
def visit_assign(self, node):
self.emit_tabs()
self.code += self.visit_expr(node.target)
expr_str = self.visit_expr(node.val)
if expr_str != '':
self.code += f' = {expr_str}'
self.code += ';\n'
def visit_ifelse(self, node):
self.emit_tabs()
self.code += f'if ({self.visit_expr(node.cond)}) {{\n'
self.tab_count += 1
for stmt in node.then_stmts:
self.visit_stmt(stmt)
self.tab_count -= 1
self.emit_tabs()
self.code += f'}} else {{\n'
self.tab_count += 1
for stmt in node.else_stmts:
self.visit_stmt(stmt)
self.tab_count -= 1
self.emit_tabs()
self.code += '}\n'
def visit_while(self, node):
self.emit_tabs()
self.code += f'while ({self.visit_expr(node.cond)}) {{\n'
self.tab_count += 1
for stmt in node.body:
self.visit_stmt(stmt)
self.tab_count -= 1
self.emit_tabs()
self.code += '}\n'
def visit_call_stmt(self, node):
self.emit_tabs()
self.code += self.visit_expr(node.call) + ';\n'
def visit_expr(self, node):
match node:
case loma_ir.Var():
if node.id in self.byref_args:
return '(*' + node.id + ')'
else:
return node.id
case loma_ir.ArrayAccess():
return f'({self.visit_expr(node.array)})[{self.visit_expr(node.index)}]'
case loma_ir.StructAccess():
return f'({self.visit_expr(node.struct)}).{node.member_id}'
case loma_ir.ConstFloat():
return f'(float)({node.val})'
case loma_ir.ConstInt():
return f'(int)({node.val})'
case loma_ir.BinaryOp():
match node.op:
case loma_ir.Add():
return f'({self.visit_expr(node.left)}) + ({self.visit_expr(node.right)})'
case loma_ir.Sub():
return f'({self.visit_expr(node.left)}) - ({self.visit_expr(node.right)})'
case loma_ir.Mul():
return f'({self.visit_expr(node.left)}) * ({self.visit_expr(node.right)})'
case loma_ir.Div():
return f'({self.visit_expr(node.left)}) / ({self.visit_expr(node.right)})'
case loma_ir.Less():
return f'({self.visit_expr(node.left)}) < ({self.visit_expr(node.right)})'
case loma_ir.LessEqual():
return f'({self.visit_expr(node.left)}) <= ({self.visit_expr(node.right)})'
case loma_ir.Greater():
return f'({self.visit_expr(node.left)}) > ({self.visit_expr(node.right)})'
case loma_ir.GreaterEqual():
return f'({self.visit_expr(node.left)}) >= ({self.visit_expr(node.right)})'
case loma_ir.Equal():
return f'({self.visit_expr(node.left)}) == ({self.visit_expr(node.right)})'
case loma_ir.And():
return f'({self.visit_expr(node.left)}) && ({self.visit_expr(node.right)})'
case loma_ir.Or():
return f'({self.visit_expr(node.left)}) || ({self.visit_expr(node.right)})'
case _:
assert False
case loma_ir.Call():
if node.id == 'thread_id':
return '__work_id'
elif node.id == 'atomic_add':
arg0_str = self.visit_expr(node.args[0])
arg1_str = self.visit_expr(node.args[1])
return f'{arg0_str} += {arg1_str}'
func_id = node.id
# call the single precision versions of the intrinsic functions
if func_id == 'sin':
func_id = 'sinf'
elif func_id == 'cos':
func_id = 'cosf'
elif func_id == 'sqrt':
func_id = 'sqrtf'
elif func_id == 'pow':
func_id = 'powf'
elif func_id == 'exp':
func_id = 'expf'
elif func_id == 'log':
func_id = 'logf'
elif func_id == 'int2float':
func_id = '(float)'
elif func_id == 'float2int':
func_id = '(int)'
ret = f'{func_id}('
if func_id in self.func_defs:
func_def = self.func_defs[func_id]
arg_strs = [self.visit_expr(arg) for arg in node.args]
for i, arg in enumerate(arg_strs):
if func_def.args[i].i == loma_ir.Out() and \
(not isinstance(func_def.args[i].t, loma_ir.Array)):
arg_strs[i] = '&(' + arg + ')'
ret += ','.join(arg_strs)
else:
ret += ','.join([self.visit_expr(arg) for arg in node.args])
ret += ')'
return ret
case None:
return ''
case _:
assert False, f'Visitor error: unhandled expression {expr}'
def codegen_c(structs : dict[str, loma_ir.Struct],
funcs : dict[str, loma_ir.func]) -> str:
""" Given loma Structs (structs) and loma functions (funcs),
return a string that represents the equivalent C code.
Parameters:
structs - a dictionary that maps the ID of a Struct to
the corresponding Struct
funcs - a dictionary that maps the ID of a function to
the corresponding func
"""
sorted_structs_list = compiler.topo_sort_structs(structs)
# Definition of structs
code = ''
for s in sorted_structs_list:
code += f'typedef struct {{\n'
for m in s.members:
# Special rule for arrays
if isinstance(m.t, loma_ir.Array) and m.t.static_size is not None:
code += f'\t{type_to_string(m.t.t)} {m.id}[{m.t.static_size}];\n'
else:
code += f'\t{type_to_string(m.t)} {m.id};\n'
code += f'}} {s.id};\n'
# Forward declaration of functions
for f in funcs.values():
code += f'{type_to_string(f.ret_type)} {f.id}('
for i, arg in enumerate(f.args):
if i > 0:
code += ', '
code += f'{type_to_string(arg)} {arg.id}'
if f.is_simd:
if len(f.args) > 0:
code += ', '
code += 'int __total_work'
code += ');\n'
for f in funcs.values():
cg = CCodegenVisitor(funcs)
cg.visit_function(f)
code += cg.code
return code