Comment #8 on issue 884 by emit.sorrels: shell sample Infinite loop in
JSObject::LookupCallbackSetterInPrototypes
http://code.google.com/p/v8/issues/detail?id=884
ok I'm attaching the disassembly for the method: "working.txt"
and "notworking.txt"
, the root of the problem may be elsewhere
notworking.txt was compiled with -O1 -fstrict-aliasing
with -O1 -fstrict-aliasing/debug mode, an assertion error is raised and the
shell example quits with:
#
# Fatal error in src/contexts.h, line 167
# CHECK(context->IsContext()) failed
#
Aborted
-----------------------------------------
if I compile with -O3 debug mode (=> -Werror -W<...> etc) the project
doesn't even compile:
g++ -o obj/debug/builtins.o -c -Wall -Werror -W -Wno-unused-parameter
-Wnon-virtual-dtor -pedantic -m64 -g -O3 -fstrict-aliasing -ansi -fno-rtti
-fno-exceptions -fvisibility=hidden -Wall -Werror -W -Wno-unused-parameter
-Wnon-virtual-dtor -pedantic -m64 -g -O3 -fstrict-aliasing -ansi
-DV8_TARGET_ARCH_X64 -DENABLE_DISASSEMBLER -DDEBUG
-DENABLE_VMSTATE_TRACKING -DENABLE_LOGGING_AND_PROFILING -DV8_ENABLE_CHECKS
-DENABLE_DEBUGGER_SUPPORT -Isrc src/builtins.cc
cc1plus: warnings being treated as errors
src/checks.h: In function 'v8::internal::Object*
v8::internal::Builtin_FastHandleApiCall(v8::internal::<unnamed>::FastHandleApiCallArgumentsType)':
src/checks.h:61:3: error: assuming signed overflow does not occur when
assuming that (X - c) > X is always false
src/arguments.h:52:5: error: assuming signed overflow does not occur when
assuming that (X - c) <= X is always true
scons: *** [obj/debug/builtins.o] Error 1
scons: building terminated because of errors
so in summary for g++ 4.5.1:
Release mode flags +:
-O0 or -O1 : works fine
-O2 -fno-strict-aliasing : works fine
-O3 -fno-strict-aliasing : works fine
-O2 or -O3 : infinite loop
Debug mode flags +:
-O0 or -O1 : works fine
-O1 -fstrict-aliasing : compiles but runtime assertion failure
-O3 : does not compile
Attachments:
working.txt 4.0 KB
notworking.txt 3.8 KB
--
v8-dev mailing list
[email protected]
http://groups.google.com/group/v8-dev
