194007 2019-01-29 23:03:49 -0800 [JSC][BigEndians] Several JSC stress tests failing 2020-03-19 10:45:23 -0700 1 1 1 Unclassified WebKit JavaScriptCore WebKit Nightly Build Unspecified Unspecified RESOLVED FIXED InRadar P2 Normal --- 1 tpopela tpopela dominik.infuehr mark.lam mcatanzaro saam webkit-bug-importer ysuzuki oldest_to_newest 1499915 0 tpopela 2019-01-29 23:03:49 -0800 After bug 132333 has been fixed by Mark (thanks again!) I can run the stress suite again on big endian machines. Nearly everything passes, but these fails: + '[' -f ./results/failed ']' + cat ./results/failed stress/dataview-jit-get.js.default stress/dataview-jit-neuter.js.default stress/dataview-jit-set.js.default stress/dataview-get-cse.js.default stress/dataview-jit-set-nan.js.default Running stress/dataview-jit-get.js.default stress/dataview-jit-get.js.default: Exception: Error: Bad! stress/dataview-jit-get.js.default: assert@dataview-jit-get.js:5:24 stress/dataview-jit-get.js.default: test1@dataview-jit-get.js:28:15 stress/dataview-jit-get.js.default: global code@dataview-jit-get.js:67:6 stress/dataview-jit-get.js.default: ERROR: Unexpected exit code: 3 FAIL: stress/dataview-jit-get.js.default Running stress/dataview-jit-neuter.js.default stress/dataview-jit-neuter.js.default: Exception: Error: Bad! stress/dataview-jit-neuter.js.default: assert@dataview-jit-neuter.js:5:24 stress/dataview-jit-neuter.js.default: test@dataview-jit-neuter.js:20:15 stress/dataview-jit-neuter.js.default: global code@dataview-jit-neuter.js:32:5 FAIL: stress/dataview-jit-neuter.js.default Running stress/dataview-jit-set.js.default stress/dataview-jit-set.js.default: Exception: Error stress/dataview-jit-set.js.default: assert@dataview-jit-set.js:5:24 stress/dataview-jit-set.js.default: test@dataview-jit-set.js:64:15 stress/dataview-jit-set.js.default: global code@dataview-jit-set.js:112:5 stress/dataview-jit-set.js.default: ERROR: Unexpected exit code: 3 FAIL: stress/dataview-jit-set.js.default stress/dataview-get-cse.js.default: Exception: Error stress/dataview-get-cse.js.default: assert@dataview-get-cse.js:5:24 stress/dataview-get-cse.js.default: test3@dataview-get-cse.js:57:15 stress/dataview-get-cse.js.default: global code@dataview-get-cse.js:60:6 stress/dataview-get-cse.js.default: ERROR: Unexpected exit code: 3 FAIL: stress/dataview-get-cse.js.default Running stress/dataview-jit-set-nan.js.default stress/dataview-jit-set-nan.js.default: Exception: Error stress/dataview-jit-set-nan.js.default: assert@dataview-jit-set-nan.js:7:24 stress/dataview-jit-set-nan.js.default: test@dataview-jit-set-nan.js:33:15 stress/dataview-jit-set-nan.js.default: global code@dataview-jit-set-nan.js:52:5 stress/dataview-jit-set-nan.js.default: ERROR: Unexpected exit code: 3 FAIL: stress/dataview-jit-set-nan.js.default I see that some of these tests do have something to do with endianess (as stated in them). But I'm not sure whether it's broken, or these tests should be skipped when running on CLoop (on x86_64, ppc64le and others they passes - so probably the big endian part is buggy). What makes me thing about skipping them is that when Tools/Scripts/run-jsc-stress-tests --no-jit --memory-limited is involved then all the failing tests are printed prefixed with "Skipped", but they are run in the end. Can you please Saam (as an author of these tests) clarify what's wrong? 1499945 1 mark.lam 2019-01-30 01:46:51 -0800 All of these are JIT tests. They say so in their names (note: CSE refers to a JIT optimization). Hence, they are not relevant to the CLoop. 1499955 2 360569 tpopela 2019-01-30 04:19:57 -0800 Created attachment 360569 Patch 1499956 3 tpopela 2019-01-30 04:20:20 -0800 (In reply to Mark Lam from comment #1) > All of these are JIT tests. They say so in their names (note: CSE refers to > a JIT optimization). Hence, they are not relevant to the CLoop. Thank you for the clarification Mark! 1499979 4 dominik.infuehr 2019-01-30 06:31:13 -0800 Not sure these tests should be skipped if `$jitTests` is false, since we do run these tests successfully on little endian both with C_LOOP and disabled DFG. Couldn't you just disable them just for big endian instead? 1499980 5 mark.lam 2019-01-30 06:31:57 -0800 Hmmm, I know I said that these tests are for the JIT. However, they do seem to pass on x86_64. So I wonder if your errors aren’t real. Can you investigate first why they fail? 1499981 6 mark.lam 2019-01-30 06:32:39 -0800 (In reply to Mark Lam from comment #5) > Hmmm, I know I said that these tests are for the JIT. However, they do seem > to pass on x86_64. So I wonder if your errors aren’t real. Can you > investigate first why they fail? I mean they pass for CLoop on x86_64. 1500417 7 tpopela 2019-01-30 21:46:52 -0800 (In reply to Mark Lam from comment #6) > (In reply to Mark Lam from comment #5) > > Hmmm, I know I said that these tests are for the JIT. However, they do seem > > to pass on x86_64. So I wonder if your errors aren’t real. Can you > > investigate first why they fail? > > I mean they pass for CLoop on x86_64. Yes, that's what I wrote in the first comment - they do pass on x86_64, ppc64le on other little endian arches. That's why I wanted some clarification. I will look for the reason why they are failing. 1500420 8 mark.lam 2019-01-30 21:59:45 -0800 (In reply to Tomas Popela from comment #7) > (In reply to Mark Lam from comment #6) > > (In reply to Mark Lam from comment #5) > > > Hmmm, I know I said that these tests are for the JIT. However, they do seem > > > to pass on x86_64. So I wonder if your errors aren’t real. Can you > > > investigate first why they fail? > > > > I mean they pass for CLoop on x86_64. > > Yes, that's what I wrote in the first comment - they do pass on x86_64, > ppc64le on other little endian arches. That's why I wanted some > clarification. I will look for the reason why they are failing. Sorry about that. 1500537 9 tpopela 2019-01-31 04:33:58 -0800 Just a quick check - if I reverse all the expected results in stress/dataview-jit-get.js (the little ones with big) then the test passes on big endians, but fails on little :).. 1500589 10 saam 2019-01-31 08:40:21 -0800 (In reply to Tomas Popela from comment #9) > Just a quick check - if I reverse all the expected results in > stress/dataview-jit-get.js (the little ones with big) then the test passes > on big endians, but fails on little :).. This isn’t at all surprising. With typed arrays, JS can observe endianness. So it’s also not surprising that we have tests that are dependent on endianness. 1501062 11 tpopela 2019-02-01 02:00:21 -0800 (In reply to Saam Barati from comment #10) > (In reply to Tomas Popela from comment #9) > > Just a quick check - if I reverse all the expected results in > > stress/dataview-jit-get.js (the little ones with big) then the test passes > > on big endians, but fails on little :).. > > This isn’t at all surprising. With typed arrays, JS can observe endianness. > So it’s also not surprising that we have tests that are dependent on > endianness. Ok, it's not surprising, but then there is something wrong with the test. If we will look at parts of dataview-jit-set.js function storeLittleEndian(dv, index, value) { dv.setInt16(index, value, true); } let buffer = new ArrayBuffer(2); let arr = new Uint16Array(buffer); let dv = new DataView(buffer); for (let i = 0; i < 10000; ++i) { storeLittleEndian(dv, 0, 0xfaba); throw new Error("Value: " + arr[0]); assert(arr[0] === 0xfaba); Then on x86_64 it will print: Exception: Error: Value: 0xfaba And that's expected. But on real big endian hardware it will print: Exception: Error: Value: 0xbafa So it stored 0xfaba not as a little indian value, but as a big endian value (as it's running on big endian arch). Then the assert will fail on the hardcoded value. 1501841 12 saam 2019-02-04 08:58:13 -0800 (In reply to Tomas Popela from comment #11) > (In reply to Saam Barati from comment #10) > > (In reply to Tomas Popela from comment #9) > > > Just a quick check - if I reverse all the expected results in > > > stress/dataview-jit-get.js (the little ones with big) then the test passes > > > on big endians, but fails on little :).. > > > > This isn’t at all surprising. With typed arrays, JS can observe endianness. > > So it’s also not surprising that we have tests that are dependent on > > endianness. > > Ok, it's not surprising, but then there is something wrong with the test. > > If we will look at parts of dataview-jit-set.js > > function storeLittleEndian(dv, index, value) { > dv.setInt16(index, value, true); > } > > let buffer = new ArrayBuffer(2); > let arr = new Uint16Array(buffer); > let dv = new DataView(buffer); > > for (let i = 0; i < 10000; ++i) { > storeLittleEndian(dv, 0, 0xfaba); > throw new Error("Value: " + arr[0]); > assert(arr[0] === 0xfaba); > > Then on x86_64 it will print: > > Exception: Error: Value: 0xfaba > > And that's expected. But on real big endian hardware it will print: > > Exception: Error: Value: 0xbafa > > So it stored 0xfaba not as a little indian value, but as a big endian value > (as it's running on big endian arch). > > Then the assert will fail on the hardcoded value. Again, this isn’t surprising since it’s doing a single load of the value. It should instead read byte-by-byte. 1501843 13 360569 saam 2019-02-04 08:59:44 -0800 Comment on attachment 360569 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=360569&action=review > JSTests/ChangeLog:8 > + Skip these tests when JIT is not enabled, as they require it. This is definitely not right. DataView exists with the JIT off. Why not just fix the test to be endian agnostic? Alternatively, I’m ok with you skipping if it’s not a little endian architecture 1501871 14 mark.lam 2019-02-04 10:03:47 -0800 (In reply to Saam Barati from comment #12) > Again, this isn’t surprising since it’s doing a single load of the value. It > should instead read byte-by-byte. Tomas, this is how you can fix the test to work for big endian platforms as well: 1. Add a isBigEndian() function to the JSDollarVM object. See the "getpid" function as examples. 2. In the tests, add a adjustForEndianess(x) function that adjusts swizzle the bytes if $vm.isBigEndian(). 3. Modify the tests to swizzle value to set e.g. ta[0] = adjustForEndianess(0x01020304); Note: all JSC tests will automatically be run with the --useDollarVM=true option specified. Hence, you can use the $vm object in the test. If you're testing with the jsc manually, you'll need to specify the --useDollarVM=true option yourself at the jsc command line. 1501920 15 saam 2019-02-04 11:26:01 -0800 You can also write an isBegEndian function solely in JS. You don’t need the help of C++ 1501922 16 mark.lam 2019-02-04 11:26:46 -0800 (In reply to Saam Barati from comment #15) > You can also write an isBegEndian function solely in JS. You don’t need the > help of C++ Oh, good point! 1507248 17 tpopela 2019-02-18 04:22:09 -0800 While working on patch I found one case where the suggested solution doesn't work: "use strict"; function assert(b) { if (!b) throw new Error; } function getIsLittleEndian() { let ab = new ArrayBuffer(2); let ta = new Int16Array(ab); ta[0] = 0x0102; let dv = new DataView(ab); return dv.getInt16(0, true) === 0x0102; } let isLittleEndian = getIsLittleEndian(); function adjustForEndianessFloat32(value) { if (isLittleEndian) return value; let ab = new ArrayBuffer(4); let ta = new Float32Array(ab); ta[0] = value; let dv = new DataView(ab); return dv.getFloat32(0, true); } function test() { function storeLittleEndian(dv, index, value) { dv.setFloat32(index, value, true); } noInline(storeLittleEndian); function store(dv, index, value, littleEndian) { dv.setFloat32(index, value, littleEndian); } noInline(store); let buffer = new ArrayBuffer(4); let arr = new Float32Array(buffer); let bits = new Uint32Array(buffer); let dv = new DataView(buffer); for (let i = 0; i < 10000; ++i) { storeLittleEndian(dv, 0, adjustForEndianessFloat32(12912.124123215122)); assert(arr[0] === 12912.1240234375); assert(bits[0] === 0x4649c07f); } } test(); On big endian machine the arr[0] contains 6.905458702346266e-41 and bits[0] 0xc07f. If I replace the storeLittleEndian() call with: store(dv, 0, 12912.124123215122, isLittleEndian); then it does work, but it's strange that the storeLittleEndian() doesn't. Is the 12912.124123215122 number somehow special? If I observe what's in arr[0], when I change that number then it's: input to adjustForEndianessFloat32() : arr[0] value 12912 : 12912 12912.1 : 12912.099609375 12912.12 : 12912.1201171875 12912.124 : 6.905458702346266e-41 Does anyone have an idea? 1516493 18 tpopela 2019-03-14 06:41:44 -0700 I'm gonna upload the patch that I've been using in downstream JSC CI for some time. It still has the problem described in comment 17. 1516494 19 364657 tpopela 2019-03-14 06:43:02 -0700 Created attachment 364657 Patch 1631695 20 364657 mcatanzaro 2020-03-19 09:50:12 -0700 Comment on attachment 364657 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=364657&action=review Skimming over this patch, it looks good to me. Hope it still applies more or less cleanly. > JSTests/stress/dataview-jit-set-nan.js:57 > - storeLittleEndian(dv, 0, 12912.124123215122); > + store(dv, 0, 12912.124123215122, isLittleEndian); > + //storeLittleEndian(dv, 0, adjustForEndianessFloat32(12912.124123215122)); Please report a new bug for this, and add a FIXME comment pointing to the bug. 1631705 21 tpopela 2020-03-19 10:08:13 -0700 (In reply to Michael Catanzaro from comment #20) > Comment on attachment 364657 [details] > Patch > > View in context: > https://bugs.webkit.org/attachment.cgi?id=364657&action=review > > Skimming over this patch, it looks good to me. Hope it still applies more or > less cleanly. > > > JSTests/stress/dataview-jit-set-nan.js:57 > > - storeLittleEndian(dv, 0, 12912.124123215122); > > + store(dv, 0, 12912.124123215122, isLittleEndian); > > + //storeLittleEndian(dv, 0, adjustForEndianessFloat32(12912.124123215122)); > > Please report a new bug for this, and add a FIXME comment pointing to the > bug. Opened https://bugs.webkit.org/show_bug.cgi?id=209289 1631718 22 393992 tpopela 2020-03-19 10:22:16 -0700 Created attachment 393992 Patch for landing 1631725 23 ews-feeder 2020-03-19 10:44:28 -0700 Committed r258710: <https://trac.webkit.org/changeset/258710> All reviewed patches have been landed. Closing bug and clearing flags on attachment 393992. 1631726 24 webkit-bug-importer 2020-03-19 10:45:23 -0700 <rdar://problem/60640238> 360569 2019-01-30 04:19:57 -0800 2019-03-14 06:42:58 -0700 Patch bug-194007-20190130131956.patch text/plain 2743 tpopela U3VidmVyc2lvbiBSZXZpc2lvbjogMjQwNzA3CmRpZmYgLS1naXQgYS9KU1Rlc3RzL0NoYW5nZUxv ZyBiL0pTVGVzdHMvQ2hhbmdlTG9nCmluZGV4IDRjZmNkNTA2NjYyNDU2MDM5NmYxOGE5NzgyYTky ZmU2MmZmNTc0MjIuLjg2ODFmMDU0NTM5ZTU4YjI2NjY0OWJmYjk0NjY0N2MxN2FhODZjMmEgMTAw NjQ0Ci0tLSBhL0pTVGVzdHMvQ2hhbmdlTG9nCisrKyBiL0pTVGVzdHMvQ2hhbmdlTG9nCkBAIC0x LDMgKzEsMTggQEAKKzIwMTktMDEtMzAgIFRvbWFzIFBvcGVsYSAgPHRwb3BlbGFAcmVkaGF0LmNv bT4KKworICAgICAgICBbSlNDXVtCaWdFbmRpYW5zXSBTZXZlcmFsIEpTQyBzdHJlc3MgdGVzdHMg ZmFpbGluZworICAgICAgICBodHRwczovL2J1Z3Mud2Via2l0Lm9yZy9zaG93X2J1Zy5jZ2k/aWQ9 MTk0MDA3CisKKyAgICAgICAgUmV2aWV3ZWQgYnkgTk9CT0RZIChPT1BTISkuCisKKyAgICAgICAg U2tpcCB0aGVzZSB0ZXN0cyB3aGVuIEpJVCBpcyBub3QgZW5hYmxlZCwgYXMgdGhleSByZXF1aXJl 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