123717 2013-11-03 18:24:27 -0800 Lacking support on a arm-traditional disassembler. 2016-12-10 00:04:45 -0800 1 1 1 Unclassified WebKit JavaScriptCore 528+ (Nightly build) All Linux RESOLVED FIXED P2 Normal --- 108645 159408 1 sloanyang ossy annulen benjamin commit-queue fpizlo ggaren koivisto mark.lam msaboff ossy saam yangqi3 oldest_to_newest 946523 0 sloanyang 2013-11-03 18:24:27 -0800 The arm-traditional assembler generate codes, but it is hard to debug without a dissassembler. 946525 1 yangqi3 2013-11-03 18:48:23 -0800 This might be a problem. We could try to use the arm objdump code to generate dissambler. 1067787 2 ossy 2015-02-09 03:16:53 -0800 It would be great to have a working disassembler for ARM traditional too to be able debug bug141193 easily. I'm trying to make the LLVM based disassembler work on ARM. 1165998 3 ossy 2016-02-18 04:32:52 -0800 LLVM dependency was removed from the trunk, now it is a bigger task and won't have time for it in the near future. 1210962 4 ossy 2016-07-14 05:50:50 -0700 It would be great to have ARM traditional disassembler to debug bug159408 easily. I managed to implement an LLVM based disassembler, but it is a little bit hacky now. I'm going upstream it when I finished cleanups. 1215538 5 284859 ossy 2016-07-29 05:28:57 -0700 Created attachment 284859 Patch 1215568 6 284859 ossy 2016-07-29 09:43:04 -0700 Comment on attachment 284859 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=284859&action=review > Source/JavaScriptCore/disassembler/ARMLLVMDisassembler.cpp:66 > + out.printf("%s%16s: [0x%08lx] %s\n", prefix, pcString, *(static_cast<unsigned long*>(pc)), instructionString); I meant reinterpret_cast here, will update. 1215614 7 284876 ossy 2016-07-29 11:13:25 -0700 Created attachment 284876 Patch 1216085 8 ossy 2016-08-01 04:32:13 -0700 ping? 1216122 9 saam 2016-08-01 09:05:42 -0700 I'm the wrong person to review, but it seems OK. I'll let others comment. 1216137 10 284876 mark.lam 2016-08-01 10:08:47 -0700 Comment on attachment 284876 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=284876&action=review I'm also not the best person to review this, but have a few comments and questions below. Another question: why can't ARM traditional use the ARMv7 disassembler (which we do have implemented)? Are the differences that great? > Source/JavaScriptCore/CMakeLists.txt:897 > + ${LLVM_LIBRARIES} If it's not too much trouble, is it possible to make this be conditional on the port? If we want to move towards using the CMake build system for all ports eventually, this seems like a burden on all ports that don't use LLVM. > Source/JavaScriptCore/disassembler/ARMLLVMDisassembler.cpp:2 > + * Copyright (C) 2013 Apple Inc. All rights reserved. I think this should be 2016, not 2013. > Source/cmake/FindLLVM.cmake:21 > +foreach (_program_name llvm-config llvm-config-3.7 llvm-config-3.6 llvm-config-3.5) > + find_program(LLVM_CONFIG_EXE NAMES ${_program_name}) > + if (LLVM_CONFIG_EXE) > + execute_process(COMMAND ${LLVM_CONFIG_EXE} --version OUTPUT_VARIABLE LLVM_VERSION OUTPUT_STRIP_TRAILING_WHITESPACE) > + if ("${LLVM_VERSION}" VERSION_LESS "${LLVM_FIND_VERSION}") > + unset(LLVM_CONFIG_EXE CACHE) > + else () > + break () > + endif () > + endif () > +endforeach () Naive question: would this work for a cross disassembler? The llvm library that we want to link to for the disassembler needs to be the one that is for the target arm device. Presumably, we would be running this makefile on an x86/x86_64 host. How does find_program knows to find that version here? It also seem strange to me that we would run the found LLVM_CONFIG_EXE to get its --version info. What am I not seeing here? 1216444 11 284876 ossy 2016-08-02 03:18:26 -0700 Comment on attachment 284876 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=284876&action=review >> Source/JavaScriptCore/CMakeLists.txt:897 >> + ${LLVM_LIBRARIES} > > If it's not too much trouble, is it possible to make this be conditional on the port? If we want to move towards using the CMake build system for all ports eventually, this seems like a burden on all ports that don't use LLVM. There is no need to add conditional here. LLVMDisassembler is optional and disabled by default an can be enabled with setting USE_ARM_LLVM_DISASSEMBLER in the cmake buildsystem (eg. build-jsc --cmakears=-DUSE_ARM_LLVM_DISASSEMBLER=ON) If we don't set it, cmake won't call find_package(LLVM REQUIRED) and this variable is an empty string. >> Source/JavaScriptCore/disassembler/ARMLLVMDisassembler.cpp:2 >> + * Copyright (C) 2013 Apple Inc. All rights reserved. > > I think this should be 2016, not 2013. I added back the pre-r196729 LLVMDisassembler.cpp which has 2013 copyright. I removed many lines and changed some lines to make it ARM traditional only and dump all instructions in hexadecimal format too. If we update the copyright, I think we should keep the original one and add 2016 with our company, not Apple. >> Source/cmake/FindLLVM.cmake:21 >> +endforeach () > > Naive question: would this work for a cross disassembler? The llvm library that we want to link to for the disassembler needs to be the one that is for the target arm device. Presumably, we would be running this makefile on an x86/x86_64 host. How does find_program knows to find that version here? It also seem strange to me that we would run the found LLVM_CONFIG_EXE to get its --version info. What am I not seeing here? No, it won't work because of what you noticed. But cross building of JSC/WebKit on Linux wasn't officially supported ever. Now we can build for ARM target on an ARM hardware or on an X86(_64) hardware inside a complete ARM rootFS emulating almost everything (perl, python, ruby, llvm-config, ...). As I mentioned in the changelog, I added back exactly the r196749 state of this file without a bit modification. It worked fine for years for LLVM-based FTL JIT, I don't plan to refactor it in the near futere. 1216464 12 ossy 2016-08-02 05:38:17 -0700 Based on comments https://bugs.webkit.org/show_bug.cgi?id=154323#c20 and https://bugs.webkit.org/show_bug.cgi?id=154323#c26 , could you guys r+ this patch to add the ARM traditional disassembler? 1216875 13 ossy 2016-08-03 04:01:25 -0700 (In reply to comment #10) > Another question: why can't ARM traditional use the ARMv7 disassembler > (which we do have implemented)? Are the differences that great? I missed this question, sorry. ARMv7Disassembler is to disassemble Thumb2 instructions generated by ARMv7Assembler. But ARMAssembler (traditional) generates ARM instructions (fixed 32-bit sized), not Thumb2 instructions. They are two different instruction set. 1216961 14 284876 mark.lam 2016-08-03 09:53:25 -0700 Comment on attachment 284876 Patch r=me 1216979 15 284876 commit-queue 2016-08-03 10:14:16 -0700 Comment on attachment 284876 Patch Clearing flags on attachment: 284876 Committed r204084: <http://trac.webkit.org/changeset/204084> 1216980 16 commit-queue 2016-08-03 10:14:20 -0700 All reviewed patches have been landed. Closing bug. 1258343 17 annulen 2016-12-09 14:33:48 -0800 >But cross building of JSC/WebKit on Linux wasn't officially supported ever. Now we can build for ARM target on an ARM hardware or on an X86(_64) hardware inside a complete ARM rootFS emulating almost everything (perl, python, ruby, llvm-config, ...). FWIW, I'm routinely cross-compile Qt port for MIPS and never thought about going through such insanity as you described :) 1258617 18 ossy 2016-12-09 23:54:44 -0800 (In reply to comment #17) > >But cross building of JSC/WebKit on Linux wasn't officially supported ever. Now we can build for ARM target on an ARM hardware or on an X86(_64) hardware inside a complete ARM rootFS emulating almost everything (perl, python, ruby, llvm-config, ...). > > FWIW, I'm routinely cross-compile Qt port for MIPS and never thought about > going through such insanity as you described :) I don't understand why do think building in a rootfs (emulating with qemu) is an insanity. I would be very curios how do you would like to run update-webkit<efl|gtk>libs, build-webkit, run-javascriptcore-tests (perl and ruby) in the _same_ X86_64 environment to build for a non X86_64 target. It's not as simple as you need a cross compiler, not at all. 1258620 19 annulen 2016-12-09 23:59:51 -0800 Ah, if you do not run tests on real hardware it makes sense indeed. 1258621 20 ossy 2016-12-10 00:04:45 -0800 (In reply to comment #19) > Ah, if you do not run tests on real hardware it makes sense indeed. We don run tests on real hardware with --remote-config-file option of run-javascriptcore-tests. But it calls ldd to collect the dependecies of the jsc binary. x86-ldd can't do anything with an ARM binary JSC. 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