212561 2020-05-29 21:08:00 -0700 AssemblyHelpers::callExceptionFuzz() is passing a wrong argument to operationExceptionFuzz(). 2020-05-30 14:10:17 -0700 1 1 1 Unclassified WebKit JavaScriptCore WebKit Nightly Build Unspecified Unspecified RESOLVED FIXED InRadar P2 Normal --- 212556 1 mark.lam mark.lam ews-watchlist keith_miller msaboff saam tzagallo webkit-bug-importer ysuzuki oldest_to_newest 1657567 0 mark.lam 2020-05-29 21:08:00 -0700 operationExceptionFuzz() expects a JSGlobalObject*. AssemblyHelpers::callExceptionFuzz() is passing an ExecState* to it. The FTL implementation is passing a globalObject as expected. 1657582 1 400652 mark.lam 2020-05-29 23:54:10 -0700 Created attachment 400652 proposed patch. 1657583 2 400652 mark.lam 2020-05-29 23:56:06 -0700 Comment on attachment 400652 proposed patch. Patch attached to wrong bug. 1657598 3 400659 mark.lam 2020-05-30 00:57:32 -0700 Created attachment 400659 proposed patch. 1657599 4 400659 ysuzuki 2020-05-30 01:06:32 -0700 Comment on attachment 400659 proposed patch. View in context: https://bugs.webkit.org/attachment.cgi?id=400659&action=review r=me with comments. > Source/JavaScriptCore/jit/AssemblyHelpers.cpp:255 > + move(GPRInfo::callFrameRegister, GPRInfo::argumentGPR1); This is not necessary if prepareCallOperation is called. Let's just pass VM pointer. > Source/JavaScriptCore/jit/AssemblyHelpers.cpp:257 > prepareCallOperation(vm); Since we are using prepareCallOperation, you can get CallFrame* via `CallFrame* callFrame = DECLARE_CALL_FRAME(vm);` as it is done in operationExceptionFuzz. Let's define operationExceptionFuzzWithVM(VM* vmPointer), and implement it as, operationExceptionFuzzWith(VM* vmPointer) { VM& vm = *vmPointer; CallFrame* callFrame = DECLARE_CALL_FRAME(vm); JITOperationPrologueCallFrameTracer tracer(vm, callFrame); /* Note that this frame tracer must be in the direct caller function from JIT code. */ ... } > Source/JavaScriptCore/jit/JITOperations.cpp:2644 > + operationExceptionFuzz(callFrame->lexicalGlobalObject(*vm)); Can you factor out the code of operationExceptionFuzz and share it with operationExceptionFuzz and operationExceptionFuzzWithCallFrame? JIT_OPERATION functions cannot be called from non JIT code (in particular if JITOperationPrologueCallFrameTracer is used). 1657622 5 mark.lam 2020-05-30 08:55:37 -0700 Thanks for the review. (In reply to Yusuke Suzuki from comment #4) > > Source/JavaScriptCore/jit/AssemblyHelpers.cpp:255 > > + move(GPRInfo::callFrameRegister, GPRInfo::argumentGPR1); > > This is not necessary if prepareCallOperation is called. Let's just pass VM > pointer. Fixed. > > Source/JavaScriptCore/jit/AssemblyHelpers.cpp:257 > > prepareCallOperation(vm); > > Since we are using prepareCallOperation, you can get CallFrame* via > `CallFrame* callFrame = DECLARE_CALL_FRAME(vm);` as it is done in > operationExceptionFuzz. > Let's define operationExceptionFuzzWithVM(VM* vmPointer), and implement it > as, > > operationExceptionFuzzWith(VM* vmPointer) > { > VM& vm = *vmPointer; > CallFrame* callFrame = DECLARE_CALL_FRAME(vm); > JITOperationPrologueCallFrameTracer tracer(vm, callFrame); /* Note that > this frame tracer must be in the direct caller function from JIT code. */ > ... > } Fixed. > > Source/JavaScriptCore/jit/JITOperations.cpp:2644 > > + operationExceptionFuzz(callFrame->lexicalGlobalObject(*vm)); > > Can you factor out the code of operationExceptionFuzz and share it with > operationExceptionFuzz and operationExceptionFuzzWithCallFrame? > JIT_OPERATION functions cannot be called from non JIT code (in particular if > JITOperationPrologueCallFrameTracer is used). Since the common part is just a few lines, and the interesting line in there involves calling __builtin_return_address(0), the common part needs to be completely inlined. I'm not sure what the behavior of __builtin_return_address() is from an inlined function. Also, on debug builds, inlining is turned off, which breaks this code. The alternative is to macroize the common part or just copy-paste. Since the lines are really short, and the effective part that matters is just 2 lines, there isn't a lot of benefit to macroizing this. I'm going with copy-paste since it makes the code more readable and easier to step through with a debugger. 1657623 6 400669 mark.lam 2020-05-30 09:01:12 -0700 Created attachment 400669 patch for landing. 1657666 7 ews-feeder 2020-05-30 14:09:37 -0700 Committed r262351: <https://trac.webkit.org/changeset/262351> All reviewed patches have been landed. Closing bug and clearing flags on attachment 400669. 1657667 8 webkit-bug-importer 2020-05-30 14:10:17 -0700 <rdar://problem/63794162> 400652 2020-05-29 23:54:10 -0700 2020-05-29 23:56:06 -0700 proposed patch. bug-212556.patch text/plain 17651 mark.lam SW5kZXg6IFNvdXJjZS9KYXZhU2NyaXB0Q29yZS9DaGFuZ2VMb2cKPT09PT09PT09PT09PT09PT09 PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PQotLS0gU291 cmNlL0phdmFTY3JpcHRDb3JlL0NoYW5nZUxvZwkocmV2aXNpb24gMjYyMzM5KQorKysgU291cmNl L0phdmFTY3JpcHRDb3JlL0NoYW5nZUxvZwkod29ya2luZyBjb3B5KQpAQCAtMSwzICsxLDYxIEBA CisyMDIwLTA1LTI5ICBNYXJrIExhbSAgPG1hcmsubGFtQGFwcGxlLmNvbT4KKworICAgICAgICBN YWtlIE9wdGlvbnM6OnVzZUpJVCgpIGJlIHRoZSBjYW5vbmljYWwgc291cmNlIG9mIHRydXRoIG9u IHdoZXRoZXIgd2Ugc2hvdWxkIHVzZSB0aGUgSklUcy4KKyAgICAgICAgaHR0cHM6Ly9idWdzLndl YmtpdC5vcmcvc2hvd19idWcuY2dpP2lkPTIxMjU1NgorCisgICAgICAgIFJldmlld2VkIGJ5IE5P Qk9EWSAoT09QUyEpLgorCisgICAgICAgIFdlIHNob3VsZCBtYWtlIE9wdGlvbnM6OnVzZUpJVCgp 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