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pywebassembly.py
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pywebassembly.py
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"""
PyWebAssembly - Implmentation of WebAssembly, and some tools.
Copyright (C) 2018-2019 Paul Dworzanski
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
"""
import spec_binary_format as binary_format
import spec_validation as validation
import spec_execution as execution
###############
# 7.1 EMBEDDING
###############
# THE FOLLOWING IS THE OFFICIAL API TO WEBASSEMBLY
# 7.1.1 STORE
def init_store():
return {"funcs":[], "mems":[], "tables":[], "globals":[]}
# 7.1.2 MODULES
def decode_module(bytestar):
try:
mod = binary_format.spec_binary_module(bytestar)
except:
return "malformed"
return mod
# this function is not in the spec. It is the inverse of the above function, useful in the examples.
def encode_module(mod):
return binary_format.spec_binary_module_inv(mod)
def parse_module(codepointstar):
# text parser not implemented yet
return -1
def validate_module(module):
#print("validate_module()")
try:
validation.spec_validate_module(module)
except Exception as e:
return "error: invalid"
return None
def instantiate_module(store,module,externvalstar):
# we deviate from the spec by also returning the return value
try:
ret = execution.spec_instantiate(store,module,externvalstar)
except Exception as e:
return store,"error",e.args[0]
store,F,startret = ret
modinst = F["module"]
return store, modinst, startret
def module_imports(module):
try: validation.spec_validate_module(mod)
except: return "error: invalid"
externtypestar, extertypeprimestar = ret
importstar = module["imports"]
if len(importstar) != len(externtypestar): return "error: wrong import length"
result = []
for i in range(len(importstar)):
importi = importstar[i]
externtypei = externtypestar[i]
resutli = [immporti["module"],importi["name"],externtypei]
result += resulti
return result
def module_exports(module):
try: ret = validation.spec_validate_module(mod)
except: return "error: invalid"
externtypestar, extertypeprimestar = ret
exportstar = module["exports"]
assert len(exportstar) == len(externtypeprimestar)
result = []
for i in range(len(importstar)):
exporti = exportstar[i]
externtypeprimei = externtypeprimestar[i]
resutli = [exporti["name"],externtypeprimei]
result += resulti
return result
# 7.1.3 EXPORTS
def get_export(moduleinst, name):
# assume valid so all export names are unique
for exportinsti in moduleinst["exports"]:
if name == exportinsti["name"]:
return exportinsti["value"]
return "error"
# 7.1.4 FUNCTIONS
def alloc_func(store, functype, hostfunc):
store, funcaddr = execution.spec_allochostfunc(store,functype,hostfunc)
return store, funcaddr
def type_func(store,funcaddr):
if len(store["funcs"]) <= funcaddr: return "error"
functype = store["funcs"][funcaddr]
return functype
def invoke_func(store,funcaddr,valstar):
try:
ret = execution.spec_invoke(store,funcaddr,valstar)
except Exception as e:
return store,e.args[0]
return store,ret
# 7.1.4 TABLES
def alloc_table(store, tabletype):
store,tableaddr = execution.spec_alloctable(store,tabletype)
return store,tableaddr
def type_table(store,tableaddr):
if len(store["tables"]) <= tableaddr: return "error"
tableinst = store["tables"][tableaddr]
max_ = tableinst["max"]
min_ = len(tableinst["elem"]) #TODO: is this min OK?
tabletype = [{"min":min_, "max":max_}, "anyfunc"]
return tabletype
def read_table(store,tableaddr,i):
if len(store["tables"]) < tableaddr: return "error"
if type(i)!=int or i < 0: return "error"
ti = store["tables"][tableaddr]
if i >= len(ti["elem"]): return "error"
return ti["elem"][i]
def write_table(store,tableaddr,i,funcaddr):
if len(store["tables"]) <= tableaddr: return "error"
if type(i)!=int or i < 0: return "error"
ti = store["tables"][tableaddr]
if i >= len(ti["elem"]): return "error"
ti["elem"][i] = funcaddr
return store
def size_table(store, tableaddr):
if len(store["tables"]) <= tableaddr: return "error"
return len(store["tables"][tableaddr]["elem"])
def grow_table(store, tableaddr, n):
if len(store["tables"]) <= tableaddr: return "error"
if type(n)!=int or n < 0: return "error"
try: execution.spec_growtable(store["tabless"][tableaddr],n)
except: return "error"
#store["tables"][tableaddr]["elem"] += [{"elem":[], "max":None} for i in range(n)] # see spec \S 4.2.7 Table Instances for discussion on uninitialized table elements.
return store
# 7.1.6 MEMORIES
def alloc_mem(store, memtype):
store, memaddr = execution.spec_allocmem(store,memtype)
return store, memaddr
def type_mem(store, memaddr):
if len(store["mems"]) <= memaddr: return "error"
meminst = store["mems"][memaddr]
max_ = meminst["max"]
min_ = len(meminst["data"])//65536 #page size = 64 Ki = 65536 #TODO: is this min OK?
return {"min":min_, "max":max_}
def read_mem(store, memaddr, i):
if len(store["mems"]) <= memaddr: return "error"
if type(i)!=int or i < 0: return "error"
mi = store["mems"][memaddr]
if i >= len(mi["data"]): return "error"
return mi["data"][i]
def write_mem(store,memaddr,i,byte):
if len(store["mems"]) <= memaddr: return "error"
if type(i)!=int or i < 0: return "error"
mi = store["mems"][memaddr]
if i >= len(mi["data"]): return "error"
mi["data"][i] = byte
return store
def size_mem(store,memaddr):
if len(store["mems"]) <= memaddr: return "error"
return len(store["mems"][memaddr])//65536 #page size = 64 Ki = 65536
def grow_mem(store,memaddr,n):
if len(store["mems"]) <= memaddr: return "error"
if type(n)!=int or n < 0: return "error"
try: execution.spec_growmem(store["mems"][memaddr],n)
except: return "error"
return store
# 7.1.7 GLOBALS
def alloc_global(store,globaltype,val):
try:
store,globaladdr = execution.spec_allocglobal(store,globaltype,val)
except:
return store,"error"
return store,globaladdr
def type_global(store, globaladdr):
if len(store["globals"]) <= globaladdr: return "error"
globalinst = store["globals"][globaladdr]
mut = globalinst["mut"]
valtype = globalinst["value"][0]
return [mut, valtype]
def read_global(store, globaladdr):
if len(store["globals"]) <= globaladdr: return "error"
gi = store["globals"][globaladdr]
return gi["value"]
# arg must look like ["i32.const",5]
def write_global(store,globaladdr,val):
if len(store["globals"]) <= globaladdr: return "error"
#TODO: type check; handle val without type
gi = store["globals"][globaladdr]
if gi["mut"] != "var": return "error"
gi["value"] = val
return store