Ruby » Ruby master

fix SEGV touching uninitialized local variable

This imemo_name is used uninitialized because the switch
above does not cover all possible imemo types.

(lldb) run
Process 26068 launched: './miniruby' (x86_64)
Process 26068 stopped

• thread #1: tid = 0x14ba96, 0x00007fff8a402132 libsystem_c.dylibstrlen + 18, queue = 'com.apple.main-thread', stop reason = EXC_BAD_ACCESS (code=1, address=0xfffffffffffffff0) frame #0: 0x00007fff8a402132 libsystem_c.dylibstrlen + 18
  libsystem_c.dylib`strlen:
  -> 0x7fff8a402132 <+18>: pcmpeqb (%rdi), %xmm0
  0x7fff8a402136 <+22>: pmovmskb %xmm0, %esi
  0x7fff8a40213a <+26>: andq $0xf, %rcx
  0x7fff8a40213e <+30>: orq $-0x1, %rax
  (lldb) bt
• thread #1: tid = 0x14ba96, 0x00007fff8a402132 libsystem_c.dylib`strlen + 18, queue = 'com.apple.main-thread', stop reason = EXC_BAD_ACCESS (code=1, address=0xfffffffffffffff0)
  • frame #0: 0x00007fff8a402132 libsystem_c.dylibstrlen + 18 frame #1: 0x00000001001f1531 minirubyBSD_vfprintf(fp=0x00007fff5fbfc9e0, fmt0="%s %s", ap=0x00007fff5fbfcbf0) + 5873 at vsnprintf.c:1026
    frame #2: 0x00000001001ef213 minirubyruby_do_vsnprintf(str="0x0000000100f46450 [0 ] T_IMEMO", n=256, fmt="%s %s", ap=0x00007fff5fbfcbf0) + 131 at sprintf.c:1285 frame #3: 0x00000001001ef3ea minirubyruby_snprintf(str="0x0000000100f46450 [0 ] T_IMEMO", n=256, fmt="%s %s") + 426 at sprintf.c:1300
    frame #4: 0x00000001000bdc61 minirubyrb_raw_obj_info(buff="0x0000000100f46450 [0 ] T_IMEMO", buff_size=256, obj=4310983760) + 2353 at gc.c:9376 frame #5: 0x00000001000b7bff minirubyobj_info(obj=4310983760) + 95 at gc.c:9428
    frame #6: 0x00000001000c1658 minirubynewobj_init(klass=0, flags=36890, v1=0, v2=4303040512, v3=4310983800, wb_protected=1, objspace=0x00000001007ee280, obj=4310983760) + 424 at gc.c:1887 frame #7: 0x00000001000b4469 minirubynewobj_of(klass=0, flags=36890, v1=0, v2=4303040512, v3=4310983800, wb_protected=1) + 217 at gc.c:1970
    frame #8: 0x00000001000b45eb minirubyrb_imemo_new(type=imemo_ast, v1=0, v2=4303040512, v3=4310983800, v0=0) + 75 at gc.c:2017 frame #9: 0x000000010011daed minirubyrb_ast_new + 61 at node.c:1146
    frame #10: 0x0000000100160e15 minirubyrb_parser_compile_file_path(vparser=4310984400, fname=4310984960, file=4310984080, start=1) + 53 at parse.y:5776 frame #11: 0x00000001001e18ea minirubyload_file_internal(argp_v=140734799795024) + 1834 at ruby.c:1907
    frame #12: 0x00000001000a1bb5 minirubyrb_ensure(b_proc=(minirubyload_file_internal at ruby.c:1795), data1=140734799795024, e_proc=(minirubyrestore_load_file at ruby.c:2007), data2=140734799795024) + 245 at eval.c:1037 frame #13: 0x00000001001df4a4 minirubyload_file(parser=4310984400, fname=4310984960, f=4310984080, script=1, opt=0x00007fff5fbfda28) + 100 at ruby.c:2026
    frame #14: 0x00000001001e084e minirubyprocess_options(argc=0, argv=0x00007fff5fbfdc00, opt=0x00007fff5fbfda28) + 3454 at ruby.c:1682 frame #15: 0x00000001001dfaae minirubyruby_process_options(argc=2, argv=0x00007fff5fbfdbf0) + 238 at ruby.c:2257
    frame #16: 0x000000010009ff43 minirubyruby_options(argc=2, argv=0x00007fff5fbfdbf0) + 211 at eval.c:105 frame #17: 0x0000000100000989 minirubymain(argc=2, argv=0x00007fff5fbfdbf0) + 105 at main.c:42
    frame #18: 0x00007fff88eda5ad libdyld.dylibstart + 1 (lldb) up 4 frame #4: 0x00000001000bdc61 minirubyrb_raw_obj_info(buff="0x0000000100f46450 [0 ] T_IMEMO", buff_size=256, obj=4310983760) + 2353 at gc.c:9376
    9373 #undef IMEMO_NAME
    9374 default: UNREACHABLE;
    9375 }
    -> 9376 snprintf(buff, buff_size, "%s %s", buff, imemo_name);
    9377
    9378 switch (imemo_type(obj)) {
    9379 case imemo_ment: {
    (lldb) p imemo_name
    (const char *) $0 = 0xffffffffffffffff
    (lldb) p imemo_type(obj)
    (imemo_type) $1 = imemo_ast
    (lldb)

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@61566 b2dd03c8-39d4-4d8f-98ff-823fe69b080e