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[Parser] Start to parse instructions #4789

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Merged
merged 1 commit into from
Jul 11, 2022
Merged

[Parser] Start to parse instructions #4789

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28 changes: 22 additions & 6 deletions scripts/gen-s-parser.py
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Original file line number Diff line number Diff line change
Expand Up @@ -693,7 +693,7 @@ def insert(self, inst, expr):
self.do_insert(inst, inst, expr)


def instruction_parser():
def instruction_parser(new_parser=False):
"""Build a trie out of all the instructions, then emit it as C++ code."""
trie = Node()
inst_length = 0
Expand All @@ -703,12 +703,23 @@ def instruction_parser():

printer = CodePrinter()

printer.print_line("char op[{}] = {{'\\0'}};".format(inst_length + 1))
printer.print_line("strncpy(op, s[0]->c_str(), {});".format(inst_length))
if not new_parser:
printer.print_line("char op[{}] = {{'\\0'}};".format(inst_length + 1))
printer.print_line("strncpy(op, s[0]->c_str(), {});".format(inst_length))

def print_leaf(expr, inst):
printer.print_line("if (strcmp(op, \"{inst}\") == 0) {{ return {expr}; }}"
.format(inst=inst, expr=expr))
if new_parser:
expr = expr.replace("()", "(ctx)")
expr = expr.replace("(s", "(ctx, in")
printer.print_line("if (op == \"{inst}\"sv) {{".format(inst=inst))
with printer.indent():
printer.print_line("auto ret = {expr};".format(expr=expr))
printer.print_line("CHECK_ERR(ret);")
printer.print_line("return *ret;")
printer.print_line("}")
else:
printer.print_line("if (strcmp(op, \"{inst}\") == 0) {{ return {expr}; }}"
.format(inst=inst, expr=expr))
printer.print_line("goto parse_error;")

def emit(node, idx=0):
Expand Down Expand Up @@ -737,7 +748,10 @@ def emit(node, idx=0):
emit(trie)
printer.print_line("parse_error:")
with printer.indent():
printer.print_line("throw ParseException(std::string(op), s.line, s.col);")
if new_parser:
printer.print_line("return in.err(\"unrecognized instruction\");")
else:
printer.print_line("throw ParseException(std::string(op), s.line, s.col);")


def print_header():
Expand All @@ -763,6 +777,8 @@ def main():
sys.exit(1)
print_header()
generate_with_guard(instruction_parser, "INSTRUCTION_PARSER")
print()
generate_with_guard(lambda: instruction_parser(True), "NEW_INSTRUCTION_PARSER")
print_footer()


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