Bug 4795 – druntime demangler unittests fail

One of the tests in the dmd test suite is having an issue with the new demangle code in druntime. To reproduce, from the dmd test directory: make test_results/runnable/eh.d.out The stack trace via gdb: #0 rt.dmain2._d_setunhandled (o=0x806b898) at src/rt/arrayshort.d:64 #1 0x0805d14b in rt.deh2._d_throw (h=0x806b898) at src/rt/deh2.d:103 #2 0x0806611e in core.demangle.demangle.error (msg=578358990409302030) at src/core/cpuid.d:569 #3 0x08068c01 in core.demangle.demangle.parseSymbolName (this=0xbffff038) at src/core/demangle.d:1188 #4 0x08068c3e in core.demangle.demangle.parseQualifiedName (this=0x806311a) at src/core/demangle.d:1208 #5 0x0806600b in core.demangle.demangle (dst=0, buf=578671844417077272) at src/core/demangle.d:1226 #6 0x080638a5 in core.runtime.defaultTraceHandler.DefaultTraceInfo.opApply (this=0x2e0fc0, dg=578088651209044196) at src/core/cpuid.d:428 #7 0x0805c851 in object.Throwable.toString (this=0x2e1fc0) at src/object_.d:1170 #8 0x0805a8ec in eh.test4 () at runnable/eh.d:164 #9 0x0805ae63 in D main () at runnable/eh.d:351 #10 0x0805d5b6 in rt.dmain2.main.runMain (this=0xbffff258) at src/rt/arrayint.d:198 #11 0x0805d510 in rt.dmain2.main.tryExec (this=0xbffff258, dg=578102996399813208) at src/rt/arrayfloat.d:240 #12 0x0805d5fa in rt.dmain2.main.runAll (this=0x0) at src/core/thread.d:411 #13 0x0805d510 in rt.dmain2.main.tryExec (this=0xbffff258, dg=578103185378374232) at src/rt/arrayfloat.d:240 #14 0x0805d4b6 in rt.dmain2.main (argc=1, argv=0x1f6770) at src/rt/arrayint.d:111 (gdb) up The string in question, if gdb isn't lying to me: "_Dmain+0x27) [0x805ae63]"

Rather than debugging via the dmd test suite.. the demangler fails the druntime unittests too. I just checked out a clean druntime trunk (I forgot mine has changes to call the demangler during stack trace dumping right now, so the original report might not be reproducable there. druntime$ make -f posix.mak unittest druntime$ ./unittest ./unittest(_D4core7runtime18runModuleUnitTestsUZb19unittestSegvHandlerUiPS4core3sys5posix6signal9siginfo_tPvZv+0x2c)[0x807cc08] [0xad7410] ./unittest(_d_throw+0x1b)[0x809803f] ./unittest(_D4core8demangle8demangleFAyaAaZAa5errorFAyaZv+0xe)[0x807a4da] ./unittest(_D4core8demangle8demangleFAyaAaZAa4testMFaZv+0x21)[0x807a925] ./unittest(_D4core8demangle8demangleFAyaAaZAa5matchMFaZv+0x11)[0x807a96d] ./unittest(_D4core8demangle8demangleFAyaAaZAa16parseMangledNameMFZv+0x19)[0x807c419] ./unittest(_D4core8demangle8demangleFAyaAaZAa+0x18)[0x807a404] ./unittest(_D4core8demangle11__unittest9FZv+0x50)[0x807c49c] ./unittest(_D4core8demangle9__modtestFZv+0x8)[0x807c4b8] ./unittest(_D4core7runtime18runModuleUnitTestsUZb16__foreachbody149MFKPS6object10ModuleInfoZi+0x24)[0x807cc68] ./unittest(_D6object10ModuleInfo7opApplyFMDFKPS6object10ModuleInfoZiZi+0x41)[0x807789d] ./unittest(runModuleUnitTests+0x87)[0x807cb83] ./unittest(_D2rt6dmain24mainUiPPaZi6runAllMFZv+0x20)[0x80986b4] ./unittest(_D2rt6dmain24mainUiPPaZi7tryExecMFMDFZvZv+0x24)[0x80985dc] ./unittest(main+0x96)[0x8098582] /lib/tls/i686/cmov/libc.so.6(__libc_start_main+0xe6)[0x126bd6] ./unittest[0x8074e01] Segmentation fault

Fixed by Sean in druntime commits r384 and r385