def __init__(self, module: structure.Module, imps: typing.Dict):
self.module = module
self.module_instance = execution.ModuleInstance()
self.store = execution.Store()
externvals = []
for e in self.module.imports:
if e.module not in imps or e.name not in imps[e.module]:
raise Exception(
f'pywasm: global import {e.module}.{e.name} not found')
if e.kind == convention.extern_func:
a = execution.HostFunc(self.module.types[e.desc],
imps[e.module][e.name])
self.store.funcs.append(a)
externvals.append(
execution.ExternValue(e.kind,
len(self.store.funcs) - 1))
continue
if e.kind == convention.extern_table:
raise NotImplementedError
if e.kind == convention.extern_mem:
raise NotImplementedError
if e.kind == convention.extern_global:
a = execution.GlobalInstance(
execution.Value(e.desc.valtype, imps[e.module][e.name]),
e.desc.mut)
self.store.globals.append(a)
externvals.append(
execution.ExternValue(e.kind,
len(self.store.globals) - 1))
continue
self.module_instance.instantiate(self.module, self.store, externvals)
def exec(self, name: str, args: typing.List):
# Invoke a function denoted by the function address with the provided arguments.
func_addr = self.func_addr(name)
func = self.store.funcs[self.module_instance.funcaddrs[func_addr]]
# Mapping check for Python valtype to WebAssembly valtype
for i, e in enumerate(func.functype.args):
if e in [convention.i32, convention.i64]:
assert isinstance(args[i], int)
if e in [convention.f32, convention.f64]:
assert isinstance(args[i], float)
args[i] = execution.Value(e, args[i])
stack = execution.Stack()
stack.ext(args)
log.debugln(f'Running function {name}({", ".join([str(e) for e in args])}):')
r = execution.call(self.module_instance, func_addr, self.store, stack)
if r:
return r[0].n
return None
def exec(self, name: str, args: typing.List):
func_addr = self.func_addr(name)
func = self.store.funcs[self.module_instance.funcaddrs[func_addr]]
for i, e in enumerate(func.functype.args):
if e in [convention.i32, convention.i64]:
assert isinstance(args[i], int)
if e in [convention.f32, convention.f64]:
assert isinstance(args[i], float)
args[i] = execution.Value(e, args[i])
stack = execution.Stack()
stack.ext(args)
frame = execution.Frame(self.module_instance, args,
len(func.functype.rets), -1)
log.debugln(
f'Running function {name}({", ".join([str(e) for e in args])}):')
r = execution.call(self.module_instance, func_addr, self.store, stack)
if r:
return r[0].n
return None