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wasm_instructions_visitor.py
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wasm_instructions_visitor.py
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import sys
import os
import re
HEAD = r"""#ifndef LFORTRAN_%(MOD)s_H
#define LFORTRAN_%(MOD)s_H
// Generated by grammar/wasm_instructions_visitor.py
#include <libasr/alloc.h>
#include <libasr/location.h>
#include <libasr/colors.h>
#include <libasr/containers.h>
#include <libasr/exception.h>
#include <libasr/asr_scopes.h>
#include <libasr/codegen/wasm_utils.h>
namespace LFortran {
namespace %(MOD)s {
"""
FOOT = r"""
} // namespace %(MOD)s
} // namespace LFortran
#endif // LFORTRAN_%(MOD)s_H
"""
class WASMInstructionsVisitor():
def __init__(self, stream, data):
self.stream = stream
self.data = data
def visitWASMInstructions(self, mod, *args):
self.emit("template <class Struct>", 0)
self.emit("class BaseWASMVisitor {", 0)
self.emit("private:", 0)
self.emit( "Struct& self() { return static_cast<Struct&>(*this); }", 1)
self.emit("public:", 0)
self.emit( "Vec<uint8_t> &code;", 1)
self.emit( "uint32_t offset;\n", 1)
self.emit( "BaseWASMVisitor(Vec<uint8_t> &code, uint32_t offset): code(code), offset(offset) {}", 1)
for inst in mod["instructions"]:
self.emit("void visit_%s(%s) {throw LFortran::LCompilersException(\"visit_%s() not implemented\");}\n" % (inst["func"], make_param_list(inst["params"]), inst["func"]), 1)
self.emit( "void decode_instructions() {", 1)
self.emit( "uint8_t cur_byte = wasm::read_b8(code, offset);", 2)
self.emit( "while (cur_byte != 0x0B) {", 2)
self.emit( "switch (cur_byte) {", 3)
for inst in filter(lambda i: i["opcode"] not in ["0xFC", "0xFD"], mod["instructions"]):
self.emit( "case %s: {" % (inst["opcode"]), 4)
for param in inst["params"]:
self.emit( "%s %s = %s(code, offset);" % (param["type"], param["name"], param["read_func"]), 5)
self.emit( "self().visit_%s(%s);" % (inst["func"], make_param_list(inst["params"], call=True)), 5)
self.emit( "break;", 5)
self.emit( "}", 4)
self.emit( "case 0xFC: {", 4)
self.emit( "uint32_t num = wasm::read_u32(code, offset);", 5)
self.emit( "switch(num) {", 5)
for inst in filter(lambda i: i["opcode"] == "0xFC", mod["instructions"]):
self.emit( "case %sU: {" % (inst["params"][0]["val"]), 6)
for param in inst["params"][1:]: # first param is already read right at the start of case 0xFC
self.emit( "%s %s = %s(code, offset);" % (param["type"], param["name"], param["read_func"]), 7)
self.emit( "self().visit_%s(%s);" % (inst["func"], make_param_list(inst["params"], call=True)), 7)
self.emit( "break;", 7)
self.emit( "}", 6)
self.emit( "default: {", 6)
self.emit( "throw LFortran::LCompilersException(\"Unknown num for opcode 0xFC\");", 7)
self.emit( "}", 6)
self.emit( "}", 5)
self.emit( "break;", 5)
self.emit( "}", 4)
self.emit( "case 0xFD: {", 4)
self.emit( "uint32_t num = wasm::read_u32(code, offset);", 5)
self.emit( "switch(num) {", 5)
for inst in filter(lambda i: i["opcode"] == "0xFD", mod["instructions"]):
self.emit( "case %sU: {" % (inst["params"][0]["val"]), 6)
for param in inst["params"][1:]: # first param is already read right at the start of case 0xFD
self.emit( "%s %s = %s(code, offset);" % (param["type"], param["name"], param["read_func"]), 7)
self.emit( "self().visit_%s(%s);" % (inst["func"], make_param_list(inst["params"], call=True)), 7)
self.emit( "break;", 7)
self.emit( "}", 6)
self.emit( "default: {", 6)
self.emit( "throw LFortran::LCompilersException(\"Unknown num for opcode 0xFD\");", 7)
self.emit( "}", 6)
self.emit( "}", 5)
self.emit( "break;", 5)
self.emit( "}", 4)
self.emit( "default: {", 4)
self.emit( "throw LFortran::LCompilersException(\"Unknown opcode\");", 5)
self.emit( "}", 4)
self.emit( "}", 3)
self.emit( "cur_byte = wasm::read_b8(code, offset);", 3)
self.emit( "}", 2)
self.emit( "}", 1)
self.emit("};", 0)
def emit(self, line, level=0):
indent = " "*level
self.stream.write(indent + line + "\n")
def make_param_list(params, call = False):
params = list(filter(lambda param: param["val"] != "0x00" and param["name"] != "num", params))
if call:
return ", ".join(map(lambda param: param["name"], params))
return ", ".join(map(lambda param: param["type"] + " /*" + param["name"] + "*/", params))
def read_file(path):
with open(path, encoding="utf-8") as fp:
return fp.read()
def process_raw_instructions(instructions_raw):
instructions = []
for line in instructions_raw.splitlines():
if line.startswith("--"):
continue
if len(instructions) > 0 and line.startswith(" "):
instructions[-1].append(line.strip())
else:
instructions.append(line.strip())
return instructions
def get_func_name(func):
splitted_name = re.split("[\._]", func)
return "".join(map(lambda name_sub_part: name_sub_part.capitalize(), splitted_name))
param_read_function = {
"uint8_t": "wasm::read_b8",
"uint32_t": "wasm::read_u32",
"int32_t": "wasm::read_i32",
"int64_t": "wasm::read_i64",
"float": "wasm::read_f32",
"double": "wasm::read_f64"
}
param_type = {
"u8": "uint8_t",
"u32": "uint32_t",
"i32": "int32_t",
"i64": "int64_t",
"f32": "float",
"f64": "double",
}
def parse_param_info(param_info):
type_info, name, val = param_info.split(":")
type = param_type[type_info]
read_func = param_read_function[type]
return {"type": type, "read_func": read_func, "name": name, "val": val}
def parse_instructions(instructions):
instructions_info = []
for inst in instructions:
binary_info, text_info = inst.split(" ⇒ ")
binary_info = binary_info.strip().split(" ")
opcode = binary_info[0]
params_info = binary_info[1:]
text_info = text_info.strip().split(" ")
func = get_func_name(text_info[0]) # first parameter is the function name
text_params = text_info[1:] # text_params are currently not needed and hence not used further
params = list(map(lambda param_info: parse_param_info(param_info), params_info))
instructions_info.append({"opcode": opcode, "func": func, "params": params})
return instructions_info
def main(argv):
if len(argv) == 3:
def_file, out_file = argv[1:]
elif len(argv) == 1:
print("Assuming default values of wasm_instructions.txt and wasm_visitor.h")
here = os.path.dirname(__file__)
def_file = os.path.join(here, "wasm_instructions.txt")
out_file = os.path.join(here, "wasm_visitor.h")
else:
print("invalid arguments")
return 2
instructions_raw = read_file(def_file)
instructions = process_raw_instructions(instructions_raw)
instructions_info = parse_instructions(instructions)
subs = {"MOD": "WASM_INSTS_VISITOR"}
fp = open(out_file, "w", encoding="utf-8")
try:
fp.write(HEAD % subs)
wasm_instructions_visitor = WASMInstructionsVisitor(fp, None)
wasm_instructions_visitor.visitWASMInstructions({"instructions": instructions_info})
fp.write(FOOT % subs)
finally:
fp.close()
if __name__ == "__main__":
sys.exit(main(sys.argv))