jshdl
Convert a Antlr4 vhdl.g4 grammar to javascript via antl4 cpp target and emscripten instead of the slow antl4 javascript target. vhdl.g4 from https://github.com/Nic30/hdlConvertor.
antlr4 cpp target (t/simple.cpp):
Scan 131kb t/iu3.vhd with antlr4 *cpp* target parser:
time ./vhdl.out t/iu3.vhd
real 0m3.666s
user 0m3.612s
sys 0m0.048s
antlr4 javascript target:
Scan 131kb t/iu3.vhd with antlr4 *javascript* target parser (t/simple.js):
time node t/simple.js
real 2m26.034s
user 2m27.348s
sys 0m1.180s
=> very slow
antlr4 cpp target parser converted with emscripten (t/simple_node.cpp):
emcc -O3 compiled: 13976859 bytes. Scan 131kb t/iu3.vhd:
$time node vhdlparser.js
real 0m15.864s
user 0m15.732s
sys 0m0.144s
emcc -Oz compiled: 8817131 bytes. Scan 131kb t/iu3.vhd:
$time node vhdlparser.js
real 0m20.709s
user 0m20.608s
sys 0m0.128s