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cparser.py
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cparser.py
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import rply.token
from pycparser import c_parser, c_ast, parse_file
from typesys import types, FuncType, Func, StructType, Value
from ast import LValue, StringLiteral
from llvmlite import ir
from package import Package, Visibility
import sys
sys.path.extend(['.', '..'])
def parse_c_file(builder, module, package, path):
ast = parse_file(filename=path,
use_cpp=True,
cpp_path='clang',
cpp_args=['-nobuiltininc',
'-D__cdecl=',
'-D__fastcall=',
'-D__inline=inline',
'-D__restrict=',
'-D__declspec(x)=',
'-D__attribute__(x)=',
'-D__asm__(x)=',
'-D__extension__=',
'-D__int64=long',
'-E', r'-Iutils/fake_libc_include']
)
# ast.show()
c_package = package.get_or_create_c_package()
for ext in ast.ext:
if isinstance(ext, c_ast.Decl):
# ext.show()
if isinstance(ext.type, c_ast.FuncDecl):
# ext.type.show()
create_c_funcdecl(builder, module, c_package, ext.name, ext.type)
continue
if isinstance(ext.type, c_ast.TypeDecl):
# ext.type.show()
# print(*ext.storage, ext.type.declname, ':', str(get_type(ext.type.type, module, c_package)))
if 'static' in ext.storage:
continue
create_c_global_var(builder, module, c_package, ext.type.declname, ext.type)
continue
if isinstance(ext.type, c_ast.PtrDecl):
if isinstance(ext.type.type, c_ast.FuncDecl):
funcdecl = ext.type.type
# print(funcdecl.type.declname, ':', str(get_type(ext.type, module, c_package)))
create_c_global_var(builder, module, c_package, funcdecl.type.declname, ext)
continue
# print(*ext.storage, ext.type.declname, ':', str(get_type(ext.type.type)))
if 'static' in ext.storage:
continue
create_c_global_var(builder, module, c_package, ext.type.declname, ext.type)
continue
if isinstance(ext.type, c_ast.Struct):
cstruct = ext.type
create_c_struct(builder, module, c_package, cstruct)
if isinstance(ext, c_ast.Typedef):
if isinstance(ext.type.type, c_ast.Struct) and ext.type.type.decls is not None:
cstruct = ext.type.type
create_typedef_c_struct(builder, module, c_package, cstruct, ext.type.declname)
else:
dtype = get_type(ext.type, module, c_package)
tname = "C::" + ext.name
types[tname] = dtype
# print(f"type {tname}: {dtype};")
if isinstance(ext, c_ast.FuncDef):
create_c_funcdecl_from_def(builder, module, c_package, ext)
continue
package.import_all_symbols_from_package(c_package)
def get_type(node, module: ir.Module, package: Package):
if isinstance(node, c_ast.IdentifierType):
pname = ""
for name in node.names:
pname += name + "."
base = types["C::" + pname[:-1]]
return base
if isinstance(node, c_ast.PtrDecl):
ty = get_type(node.type, module, package)
if isinstance(ty.get_ir_type(), ir.VoidType):
return types["C::char"].get_pointer_to()
else:
return ty.get_pointer_to()
if isinstance(node, c_ast.Struct):
if node.name is None:
sname = module.get_unique_name("C::_unnamed_struct")
else:
sname = "C::" + node.name
stype = StructType(node.name, module.context.get_identified_type(node.name), [])
types[sname] = stype
package.add_symbol(node.name, stype)
return types[sname]
if isinstance(node, c_ast.Union):
if node.name is None:
name = module.get_unique_name("_unnamed_union")
else:
name = node.name
sname = "C::" + name
stype = StructType(name, module.context.get_identified_type(name), [])
types[sname] = stype
package.add_symbol(name, stype)
return types[sname]
if isinstance(node, c_ast.FuncDecl):
rtype = get_type(node.type, module, package)
args = []
for param_decl in node.args.params:
args.append((param_decl.name, get_type(param_decl.type, module, package)))
sargtypes = [arg[1] for arg in args]
argtypes = [arg.get_ir_type() for arg in sargtypes]
fnty = ir.FunctionType(rtype.get_ir_type(), argtypes)
sfnty = FuncType("", fnty, rtype, sargtypes)
return sfnty
return get_type(node.type, module, package)
def create_typedef_c_struct(builder, module, package, node, name):
fields = [(decl.name, get_type(decl.type, module, package)) for decl in node.decls]
stype = StructType(name, module.context.get_identified_type(name), [])
sname = "C::" + name
types[sname] = stype
package.add_symbol(name, stype)
s_str = f"type {str(types[sname])}: struct"
if len(fields) > 0:
s_str += ' {'
for fld in fields:
s_str += f" {fld[0]}: {fld[1]},"
types[sname].add_field(fld[0], fld[1], None)
s_str = s_str.rstrip(",") + " }"
else:
s_str += ';'
# print(s_str)
if module.context.get_identified_type(name).is_opaque and len(fields) > 0:
idstruct = module.context.get_identified_type(name)
idstruct.set_body(*[field[1].get_ir_type() for field in fields])
def create_c_struct(builder, module, package, node):
name = "C::" + node.name
if node.decls is not None:
fields = [(decl.name, get_type(decl.type, module, package)) for decl in node.decls]
else:
fields = []
stype = StructType(node.name, module.context.get_identified_type(node.name), [])
types[name] = stype
package.add_symbol(node.name, stype)
if len(fields) > 0:
for fld in fields:
types[name].add_field(fld[0], fld[1], None)
if module.context.get_identified_type(node.name).is_opaque and len(fields) > 0:
idstruct = module.context.get_identified_type(node.name)
idstruct.set_body(*[field[1].irtype for field in fields])
def create_c_funcdecl_from_def(builder, module, package, node):
decl = node.decl
name = decl.name
typedecl: c_ast.FuncDecl = decl.type
rtype = get_type(typedecl.type, module, package)
args = []
for param_decl in decl.type.args.params:
args.append((param_decl.name, get_type(param_decl.type, module, package)))
# print(f"fn {name}({[str(arg[1]) for arg in args]}): {rtype};")
sargtypes = [arg[1] for arg in args]
argtypes = [arg.get_ir_type() for arg in sargtypes]
fnty = ir.FunctionType(rtype.get_ir_type(), argtypes)
# print("%s (%s)" % (self.name.value, fnty))
sfnty = FuncType("", fnty, rtype, sargtypes)
fname = "C::" + name
fn = ir.Function(module, fnty, name)
fn.args = tuple([ir.Argument(fn, arg[1].get_ir_type(), arg[0]) for arg in args])
arg_str = ""
for sarg in sargtypes:
arg_str += f"{str(sarg)}, "
arg_str = arg_str.rstrip(", ")
# print(f"fn {fname}({arg_str}): {str(rtype)}")
# self.module.sfunctys[self.name.value] = sfnty
if fname not in module.sfuncs:
module.sfuncs[fname] = Func(fname, sfnty.rtype, c_decl=True, visibility=Visibility.PRIVATE)
package.add_symbol(name, module.sfuncs[fname])
module.sfuncs[fname].add_overload(sfnty.atypes, fn)
else:
module.sfuncs[fname].add_overload(sfnty.atypes, fn)
def create_c_funcdecl(builder, module: ir.Module, package, name, decl):
rtype = get_type(decl.type, module, package)
args = []
for param_decl in decl.args.params:
args.append((param_decl.name, get_type(param_decl.type, module, package)))
# print(f"fn {name}({[str(arg[1]) for arg in args]}): {rtype};")
sargtypes = [arg[1] for arg in args]
argtypes = [arg.get_ir_type() for arg in sargtypes]
fnty = ir.FunctionType(rtype.get_ir_type(), argtypes)
# print("%s (%s)" % (self.name.value, fnty))
sfnty = FuncType("", fnty, rtype, sargtypes)
fname = "C::" + name
try:
fn = module.get_global(name)
except KeyError:
fn = ir.Function(module, fnty, name)
if len(args) > 0 and not isinstance(args[0][1].get_ir_type(), ir.VoidType):
fn.args = tuple([ir.Argument(fn, arg[1].get_ir_type(), arg[0]) if arg[0] is not None
else ir.Argument(fn, arg[1].get_ir_type()) for arg in args])
else:
fn.args = tuple()
arg_str = ""
for sarg in sargtypes:
arg_str += f"{str(sarg)}, "
arg_str = arg_str.rstrip(", ")
# print(f"fn {fname}({arg_str}): {str(rtype)}")
# self.module.sfunctys[self.name.value] = sfnty
if fname not in module.sfuncs:
module.sfuncs[fname] = Func(name, sfnty.rtype, c_decl=True, visibility=Visibility.PRIVATE)
package.add_symbol(name, module.sfuncs[fname])
module.sfuncs[fname].add_overload(sfnty.atypes, fn)
else:
module.sfuncs[fname].add_overload(sfnty.atypes, fn)
def create_c_global_var(builder, module, package, name, node):
ty = get_type(node.type, module, package)
try:
var = module.get_global(name)
except KeyError:
var = ir.GlobalVariable(module, ty.get_ir_type(), name)
val = Value(name, ty, var, objtype='global')
package.add_symbol(name, val)