wdscxsj / antlrperfcomp

Performance comparison between Go and Java runtimes of ANTLR v4.7

This repo contains files related to my reply in antlr/antlr4#1540. (Search for "It seems that the Go runtime is still 1~2x slower than Java.") All of them are kept untouched despite poor naming and other issues.

File listing:

• C.g4 is identical to https://github.com/antlr/grammars-v4/blob/master/c/C.g4.

• cpu.prof and mem.prof were generated by cg.go.

• CJ.java were used for comparison.

• input.c was generated from lstrlib.c shipped with Lua v5.3.4.

  1. Visual C++ was used to do macro expansion: cl /EP lstrlib.c > input.c.
  2. Duplicate newlines were removed (and some surplus #pragma once).
  3. enum KOption was commented out. (A bug in the Go runtime, maybe?)

Auxiliary files:

• antlr.jar v4.7.
• java/* were generated by java -jar antlr.jar -o java C.g4.

My environment:

• ANTLR 4.7 with Java 1.8 64-bit.
• Go 1.8 64-bit.
• Windows 7 64-bit.