118482 2013-07-08 13:45:24 -0700 fourthTier: Change JSStack to use macro to determine stack growth direction 2013-11-05 09:02:10 -0800 1 1 1 Unclassified WebKit JavaScriptCore 528+ (Nightly build) Unspecified Unspecified RESOLVED WONTFIX P2 Normal --- 116888 1 msaboff msaboff benjamin cmarcelo commit-queue ggaren oldest_to_newest 906898 0 msaboff 2013-07-08 13:45:24 -0700 Part of changing JSC to use the C Stack <https://bugs.webkit.org/show_bug.cgi?id=116888>. This patch is to change the direction of the stack direction in JSStack class to be controlled by #ifdef. Changes to some related classes need to be made as well. 906910 1 206266 msaboff 2013-07-08 14:17:45 -0700 Created attachment 206266 Patch 906925 2 206266 fpizlo 2013-07-08 15:06:08 -0700 Comment on attachment 206266 Patch Is it clear that this should be done under #if checks? This means that we will have a *ton* of code behind such checks. Seems like it might be better to do this as a giant patch. 906926 3 msaboff 2013-07-08 15:09:04 -0700 (In reply to comment #2) > (From update of attachment 206266 [details]) > Is it clear that this should be done under #if checks? This means that we will have a *ton* of code behind such checks. Seems like it might be better to do this as a giant patch. Geoff and I talked about this some and agreed that we'd do a lot of smaller patches. I actually don't think there will be lots of #ifdef code. This code abstracts much of the placement of slots relative to the frame pointer. Therefore I suspect that other code will require both "grows up" and "grows down" code paths. 906964 4 206266 ggaren 2013-07-08 17:27:17 -0700 Comment on attachment 206266 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=206266&action=review Let's not #ifdef like this. I believe we can use math to avoid a mega-patch. I'll try to give some examples. This has the advantage of being able to test code incrementally / continuously. But if we can't use math, let's use a mega-patch. > Source/JavaScriptCore/interpreter/CallFrame.h:230 > + static int argumentOffset(int argument) { return s_firstArgumentOffset + argument; } Should be something like "return (JSStack::callFrameHeaderSize + 1 + argument) * s_argumentDirection;". > Source/JavaScriptCore/interpreter/CallFrame.h:231 > + static int argumentOffsetIncludingThis(int argument) { return s_thisArgumentOffset + argument; } Should be something like "return (JSStack::callFrameHeaderSize + argument) * s_argumentDirection;". > Source/JavaScriptCore/interpreter/JSStack.cpp:145 > void JSStack::gatherConservativeRoots(ConservativeRoots& conservativeRoots) > { > - conservativeRoots.add(begin(), getTopOfStack()); > +#if ENABLE(JSC_STACK_GROWS_DOWN) > + conservativeRoots.add(getTopOfStack(), highAddress()); > +#else > + conservativeRoots.add(lowAddress(), getTopOfStack()); > +#endif > } > > void JSStack::gatherConservativeRoots(ConservativeRoots& conservativeRoots, JITStubRoutineSet& jitStubRoutines, DFGCodeBlocks& dfgCodeBlocks) > { > - conservativeRoots.add(begin(), getTopOfStack(), jitStubRoutines, dfgCodeBlocks); > +#if ENABLE(JSC_STACK_GROWS_DOWN) > + conservativeRoots.add(getTopOfStack(), highAddress(), jitStubRoutines, dfgCodeBlocks); > +#else > + conservativeRoots.add(lowAddress(), getTopOfStack(), jitStubRoutines, dfgCodeBlocks); > +#endif > } These should use a helper function that swaps begin and end if they're out of order. We already need this for the C stack (see MachineThreads::gatherFromCurrentThread), so perhaps it should be built into ConservativeRoots::add. > Source/JavaScriptCore/interpreter/JSStack.h:70 > +#if ENABLE(JSC_STACK_GROWS_DOWN) > + ArgumentCount = 6, > + CallerFrame = 5, > + Callee = 4, > + ScopeChain = 3, > + ReturnPC = 2, // This is either an Instruction* or a pointer into JIT generated code stored as an Instruction*. > + CodeBlock = 1, > +#else > ArgumentCount = -6, > CallerFrame = -5, > Callee = -4, > ScopeChain = -3, > ReturnPC = -2, // This is either an Instruction* or a pointer into JIT generated code stored as an Instruction*. > CodeBlock = -1, > +#endif These should multiply by a constant like argumentDirection or callFrameDirection. 906968 5 msaboff 2013-07-08 17:43:31 -0700 (In reply to comment #4) > (From update of attachment 206266 [details]) > View in context: https://bugs.webkit.org/attachment.cgi?id=206266&action=review > > Let's not #ifdef like this. > > I believe we can use math to avoid a mega-patch. I'll try to give some examples. This has the advantage of being able to test code incrementally / continuously. > > But if we can't use math, let's use a mega-patch. > > > Source/JavaScriptCore/interpreter/CallFrame.h:230 > > + static int argumentOffset(int argument) { return s_firstArgumentOffset + argument; } > > Should be something like "return (JSStack::callFrameHeaderSize + 1 + argument) * s_argumentDirection;". > > > Source/JavaScriptCore/interpreter/CallFrame.h:231 > > + static int argumentOffsetIncludingThis(int argument) { return s_thisArgumentOffset + argument; } > > Should be something like "return (JSStack::callFrameHeaderSize + argument) * s_argumentDirection;". > > > Source/JavaScriptCore/interpreter/JSStack.cpp:145 > > void JSStack::gatherConservativeRoots(ConservativeRoots& conservativeRoots) > > { > > - conservativeRoots.add(begin(), getTopOfStack()); > > +#if ENABLE(JSC_STACK_GROWS_DOWN) > > + conservativeRoots.add(getTopOfStack(), highAddress()); > > +#else > > + conservativeRoots.add(lowAddress(), getTopOfStack()); > > +#endif > > } > > > > void JSStack::gatherConservativeRoots(ConservativeRoots& conservativeRoots, JITStubRoutineSet& jitStubRoutines, DFGCodeBlocks& dfgCodeBlocks) > > { > > - conservativeRoots.add(begin(), getTopOfStack(), jitStubRoutines, dfgCodeBlocks); > > +#if ENABLE(JSC_STACK_GROWS_DOWN) > > + conservativeRoots.add(getTopOfStack(), highAddress(), jitStubRoutines, dfgCodeBlocks); > > +#else > > + conservativeRoots.add(lowAddress(), getTopOfStack(), jitStubRoutines, dfgCodeBlocks); > > +#endif > > } > > These should use a helper function that swaps begin and end if they're out of order. We already need this for the C stack (see MachineThreads::gatherFromCurrentThread), so perhaps it should be built into ConservativeRoots::add. > > > Source/JavaScriptCore/interpreter/JSStack.h:70 > > +#if ENABLE(JSC_STACK_GROWS_DOWN) > > + ArgumentCount = 6, > > + CallerFrame = 5, > > + Callee = 4, > > + ScopeChain = 3, > > + ReturnPC = 2, // This is either an Instruction* or a pointer into JIT generated code stored as an Instruction*. > > + CodeBlock = 1, > > +#else > > ArgumentCount = -6, > > CallerFrame = -5, > > Callee = -4, > > ScopeChain = -3, > > ReturnPC = -2, // This is either an Instruction* or a pointer into JIT generated code stored as an Instruction*. > > CodeBlock = -1, > > +#endif > > These should multiply by a constant like argumentDirection or callFrameDirection. I thought about using a sign constant. That eliminate much of the #ifdef's, but the stack committing and recommitting still needs separate paths. The reason I went down the #ifdef path is that I wanted the final code, that is after we change the direction to be at least as clean as the current code. I don't think we'll want to change the direction again. The difference in the two approaches is what the clean up patch looks like. With the #ifdef's, we know what code gets eliminated. The arithmetic approach requires either placing FIXME comments or remembering OOB. Been discussing this with Phil and he thinks that this is the least of our worries. The llint will have to add a negate instruction for register offsets when it reads them from the byte codes. Negation also has to happen for the JITs, but that is done in the generating code. I'll post a patch based on arithmetic for comparison. 906983 6 ggaren 2013-07-08 19:49:00 -0700 > Been discussing this with Phil and he thinks that this is the least of our worries. The llint will have to add a negate instruction for register offsets when it reads them from the byte codes. Negation also has to happen for the JITs, but that is done in the generating code. Or we could change the encoded operands. 907245 7 206359 msaboff 2013-07-09 17:23:13 -0700 Created attachment 206359 Updated patch Limited the #ifdef's to JSStack files. The ifdef's are needed due to doing arithmetic or comparisons with pointers or size_t type values. In both cases, we can't use the multiply by -1 or 1 trick. In some cases, we could create an #ifdef'ed help function to do <= comparisons or pointer arithmetic, but I felt that would obfuscate the reading of the code. If this patch isn't acceptable, then I think it is mega patch time. 909091 8 msaboff 2013-07-16 18:20:30 -0700 Given what was discussed and the difficulty of making several small patches, we will work on one large patch to change the stack growth direction. That patch will be tracked in https://bugs.webkit.org/show_bug.cgi?id=118758 - "fourthTier: Change JSStack to grow from high to low addresses" 947202 9 206359 ossy 2013-11-05 09:02:10 -0800 Comment on attachment 206359 Updated patch Cleared review? from attachment 206359 so that this bug does not appear in http://webkit.org/pending-review. If you would like this patch reviewed, please attach it to a new bug (or re-open this bug before marking it for review again). 206266 2013-07-08 14:17:45 -0700 2013-07-09 17:23:13 -0700 Patch 118482.patch text/plain 19801 msaboff SW5kZXg6IFNvdXJjZS9KYXZhU2NyaXB0Q29yZS9DaGFuZ2VMb2cKPT09PT09PT09PT09PT09PT09 PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PQotLS0gU291 cmNlL0phdmFTY3JpcHRDb3JlL0NoYW5nZUxvZwkocmV2aXNpb24gMTUyNDYzKQorKysgU291cmNl L0phdmFTY3JpcHRDb3JlL0NoYW5nZUxvZwkod29ya2luZyBjb3B5KQpAQCAtMSwzICsxLDQ4IEBA CisyMDEzLTA3LTA4ICBNaWNoYWVsIFNhYm9mZiAgPG1zYWJvZmZAYXBwbGUuY29tPgorCisgICAg ICAgIGZvdXJ0aFRpZXI6IENoYW5nZSBKU1N0YWNrIHRvIHVzZSBtYWNybyB0byBkZXRlcm1pbmUg c3RhY2sgZ3Jvd3RoIGRpcmVjdGlvbgorICAgICAgICBodHRwczovL2J1Z3Mud2Via2l0Lm9yZy9z aG93X2J1Zy5jZ2k/aWQ9MTE4NDgyCisKKyAgICAgICAgUmV2aWV3ZWQgYnkgTk9CT0RZIChPT1BT ISkuCisKKyAgICAgICAgQWRkZWQgI2lmZGVmIHBhdGhzIHRvIEpTU3RhY2sgZm9yIGdyb3dpbmcg dGhlIHN0YWNrIGZyb20gaGlnaGVyIHRvIGxvd2VyIGFkZHJlc3Nlcy4KKyAgICAgICAgSWZkZWYn 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