Issue #20270 has been updated by nobu (Nobuyoshi Nakada). Description updated JFYI: It just so happens that the second issue is not a segmentation fault. In `pm_parse_string` call just after the warning: ``` (lldb) rp source bits: [ U] (struct RFile) $1 = { basic = (flags = 11, klass = 4301593320) fptr = 0x0000000128628c10 } (lldb) p *(struct RString*)source (struct RString) { basic = (flags = 11, klass = 4301593320) len = 4972514320 as = { heap = { ptr = 0x0000000000000000 aux = (capa = 0, shared = 0) } embed = (ary = "") } } ``` `source` is actually a `RFile`, but is interpreted as a huge embedded `RString` that starts with a NUL char. Its `as.embed` is beyond the boundary since VWA, it is unpredictable what can be there. ---------------------------------------- Bug #20270: Options with `--parser=prism` https://bugs.ruby-lang.org/issues/20270#change-106815 * Author: nobu (Nobuyoshi Nakada) * Status: Open * Priority: Normal * Backport: 3.0: DONTNEED, 3.1: DONTNEED, 3.2: DONTNEED, 3.3: REQUIRED ---------------------------------------- ### `--dump` option Currently `parsetree` and `prism_parsetree` bits are separated, but it seems meaningless as far as `--parser` option selects only one parser. Why doesn't simply `--dump=parsetree` dump AST by parse.y, or PRISM AST if `--parser=prism` is given? Actually, `ruby --dump=parsetree --parser=prism` just segfaults, because these bits and `--parser` option are separately handled. ### streaming code from stdin ```sh-session $ echo end | ruby --parser=prism - ruby: warning: The compiler based on the Prism parser is currently experimental and compatibility with the compiler based on parse.y is not yet complete. Please report any issues you find on the `ruby/prism` issue tracker. -: warning: Prism support for streaming code from stdin is not currently supported ``` Nothing reported is fine, since it is not currently supported. I was a bit curious that it looks like trying something after the warning. ```C if (strcmp(opt->script, "-") == 0) { int xflag = opt->xflag; VALUE rb_source = open_load_file(opt->script_name, &xflag); opt->xflag = xflag != 0; rb_warn("Prism support for streaming code from stdin is not currently supported"); error = pm_parse_string(&result, rb_source, opt->script_name); } ``` Note that `open_load_file` returns `rb_stdin` when `-` is given. This object is a `RFile`, not a `RString`, and `RSTRING_PTR(rb_source)` accesses after the object boundary. It should just bail out, not try obviously wrong thing. ### Fix https://github.com/nobu/ruby/tree/options-refactor https://github.com/ruby/ruby/pull/9991 -- https://bugs.ruby-lang.org/