Attachment 340466 Details for Bug 185670 – patch

[patch] patch

c-backup.diff (text/plain), 30.04 KB, created by Saam Barati on 2018-05-15 20:09:26 PDT

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Creator: Saam Barati

Created: 2018-05-15 20:09:26 PDT

Size: 30.04 KB

patch

obsolete

>Index: JSTests/ChangeLog
>===================================================================
>--- JSTests/ChangeLog	(revision 231834)
>+++ JSTests/ChangeLog	(working copy)
>@@ -1,3 +1,39 @@
>+2018-05-15  Saam Barati  <sbarati@apple.com>
>+
>+        Constant fold CheckTypeInfoFlags on ImplementsDefaultHasInstance
>+        https://bugs.webkit.org/show_bug.cgi?id=185670
>+
>+        Reviewed by NOBODY (OOPS!).
>+
>+        * microbenchmarks/constant-fold-check-type-info-flags.js: Added.
>+        (clobber):
>+        (C):
>+        (D):
>+        (foo):
>+        (access):
>+        (theClass):
>+        * stress/dont-constant-fold-check-type-info-on-bound-function.js: Added.
>+        (C):
>+        (foo):
>+
>+2018-05-15  Saam Barati  <sbarati@apple.com>
>+
>+        OverridesHasInstance should not rely on OSR exit information and should be in ConstantFoldingPhase
>+        https://bugs.webkit.org/show_bug.cgi?id=154832
>+
>+        Reviewed by NOBODY (OOPS!).
>+
>+        * microbenchmarks/constant-fold-check-type-info-flags.js: Added.
>+        (clobber):
>+        (C):
>+        (D):
>+        (foo):
>+        (access):
>+        (theClass):
>+        * stress/dont-constant-fold-check-type-info-on-bound-function.js: Added.
>+        (C):
>+        (foo):
>+
> 2018-05-14  Leo Balter  <leonardo.balter@gmail.com>
> 
>         Fix a legacy CRLF eol from Test262
>Index: JSTests/microbenchmarks/constant-fold-check-type-info-flags.js
>===================================================================
>--- JSTests/microbenchmarks/constant-fold-check-type-info-flags.js	(nonexistent)
>+++ JSTests/microbenchmarks/constant-fold-check-type-info-flags.js	(working copy)
>@@ -0,0 +1,41 @@
>+"use strict";
>+
>+function clobber() { }
>+noInline(clobber);
>+
>+class C { }
>+class D { }
>+
>+function foo(x, C) {
>+    clobber();
>+    return x instanceof C;
>+}
>+noInline(foo);
>+
>+function access(o) {
>+    return o.foo0;
>+}
>+noInline(access);
>+
>+function theClass(i) {
>+    if (i & 1)
>+        return C;
>+    return D;
>+}
>+noInline(theClass);
>+
>+let x = new C;
>+for (let i = 0; i < 1000; ++i) {
>+    let k = theClass(i);
>+    if (i < 20)
>+        k["foo" + i] = i;
>+    if (i >= 20)
>+        access(k);
>+    if (i === 100)
>+        k["foo" + i] = i;
>+    let result = foo(x, k);
>+    if (k === C && result !== true)
>+        throw new Error("Bad")
>+    if (k !== C && result !== false)
>+        throw new Error("Bad")
>+}
>Index: JSTests/stress/dont-constant-fold-check-type-info-on-bound-function.js
>===================================================================
>--- JSTests/stress/dont-constant-fold-check-type-info-on-bound-function.js	(nonexistent)
>+++ JSTests/stress/dont-constant-fold-check-type-info-on-bound-function.js	(working copy)
>@@ -0,0 +1,17 @@
>+"use strict";
>+
>+class C { }
>+let x = new C;
>+C = C.bind(this);
>+
>+function foo(x) {
>+    x.foo;
>+    return x instanceof C;
>+}
>+noInline(foo);
>+
>+for (let i = 0; i < 1000; ++i) {
>+    let r = foo(x);
>+    if (r !== true)
>+        throw new Error("Bad")
>+}
>Index: Source/JavaScriptCore/ChangeLog
>===================================================================
>--- Source/JavaScriptCore/ChangeLog	(revision 231819)
>+++ Source/JavaScriptCore/ChangeLog	(working copy)
>@@ -1,3 +1,41 @@
>+2018-05-15  Saam Barati  <sbarati@apple.com>
>+
>+        Constant fold CheckTypeInfoFlags on ImplementsDefaultHasInstance
>+        https://bugs.webkit.org/show_bug.cgi?id=185670
>+
>+        Reviewed by NOBODY (OOPS!).
>+
>+        This patch makes it so that we constant fold CheckTypeInfoFlags for
>+        ImplementsDefaultHasInstance inside of AI/constant folding. We constant
>+        fold in three ways:
>+        - When the incoming value is a constant, we just look at its inline type
>+        flags. Since those flags never change after an object is created, this
>+        is sound.
>+        - Based on the incoming value having a finite structure set. We just iterate
>+        all structures and ensure they have the bit set.
>+        - Based on speculated type. To do this, I split up SpecFunction into two
>+        subheaps where one is for functions that have the bit set, and one for
>+        functions that don't have the bit set. The latter is currently only comprised
>+        of JSBoundFunctions. To constant fold, we check that the incoming
>+        value only has the SpecFunction type with ImplementsDefaultHasInstance set.
>+
>+        * bytecode/SpeculatedType.cpp:
>+        (JSC::speculationFromClassInfo):
>+        * bytecode/SpeculatedType.h:
>+        * dfg/DFGAbstractInterpreterInlines.h:
>+        (JSC::DFG::AbstractInterpreter<AbstractStateType>::executeEffects):
>+        * dfg/DFGConstantFoldingPhase.cpp:
>+        (JSC::DFG::ConstantFoldingPhase::foldConstants):
>+        * dfg/DFGStrengthReductionPhase.cpp:
>+        (JSC::DFG::StrengthReductionPhase::handleNode):
>+        * runtime/JSFunction.cpp:
>+        (JSC::JSFunction::JSFunction):
>+        (JSC::JSFunction::assertTypeInfoFlagInvariants):
>+        * runtime/JSFunction.h:
>+        (JSC::JSFunction::assertTypeInfoFlagInvariants):
>+        * runtime/JSFunctionInlines.h:
>+        (JSC::JSFunction::JSFunction):
>+
> 2018-05-15  Devin Rousso  <webkit@devinrousso.com>
> 
>         Web Inspector: Add rulers and guides
>Index: Source/JavaScriptCore/bytecode/SpeculatedType.cpp
>===================================================================
>--- Source/JavaScriptCore/bytecode/SpeculatedType.cpp	(revision 231813)
>+++ Source/JavaScriptCore/bytecode/SpeculatedType.cpp	(working copy)
>@@ -34,6 +34,7 @@
> #include "JSBigInt.h"
> #include "JSCInlines.h"
> #include "JSFunction.h"
>+#include "JSBoundFunction.h"
> #include "JSMap.h"
> #include "JSSet.h"
> #include "JSWeakMap.h"
>@@ -432,8 +433,11 @@ SpeculatedType speculationFromClassInfo(
>     if (classInfo == ProxyObject::info())
>         return SpecProxyObject;
>     
>-    if (classInfo->isSubClassOf(JSFunction::info()))
>-        return SpecFunction;
>+    if (classInfo->isSubClassOf(JSFunction::info())) {
>+        if (classInfo == JSBoundFunction::info())
>+            return SpecFunctionWithNonDefaultHasInstance;
>+        return SpecFunctionWithDefaultHasInstance;
>+    }
>     
>     if (isTypedView(classInfo->typedArrayStorageType))
>         return speculationFromTypedArrayType(classInfo->typedArrayStorageType);
>Index: Source/JavaScriptCore/bytecode/SpeculatedType.h
>===================================================================
>--- Source/JavaScriptCore/bytecode/SpeculatedType.h	(revision 231813)
>+++ Source/JavaScriptCore/bytecode/SpeculatedType.h	(working copy)
>@@ -38,64 +38,66 @@ namespace JSC {
> class Structure;
> 
> typedef uint64_t SpeculatedType;
>-static const SpeculatedType SpecNone               = 0; // We don't know anything yet.
>-static const SpeculatedType SpecFinalObject        = 1ull << 0; // It's definitely a JSFinalObject.
>-static const SpeculatedType SpecArray              = 1ull << 1; // It's definitely a JSArray.
>-static const SpeculatedType SpecFunction           = 1ull << 2; // It's definitely a JSFunction.
>-static const SpeculatedType SpecInt8Array          = 1ull << 3; // It's definitely an Int8Array or one of its subclasses.
>-static const SpeculatedType SpecInt16Array         = 1ull << 4; // It's definitely an Int16Array or one of its subclasses.
>-static const SpeculatedType SpecInt32Array         = 1ull << 5; // It's definitely an Int32Array or one of its subclasses.
>-static const SpeculatedType SpecUint8Array         = 1ull << 6; // It's definitely an Uint8Array or one of its subclasses.
>-static const SpeculatedType SpecUint8ClampedArray  = 1ull << 7; // It's definitely an Uint8ClampedArray or one of its subclasses.
>-static const SpeculatedType SpecUint16Array        = 1ull << 8; // It's definitely an Uint16Array or one of its subclasses.
>-static const SpeculatedType SpecUint32Array        = 1ull << 9; // It's definitely an Uint32Array or one of its subclasses.
>-static const SpeculatedType SpecFloat32Array       = 1ull << 10; // It's definitely an Uint16Array or one of its subclasses.
>-static const SpeculatedType SpecFloat64Array       = 1ull << 11; // It's definitely an Uint16Array or one of its subclasses.
>-static const SpeculatedType SpecTypedArrayView     = SpecInt8Array | SpecInt16Array | SpecInt32Array | SpecUint8Array | SpecUint8ClampedArray | SpecUint16Array | SpecUint32Array | SpecFloat32Array | SpecFloat64Array;
>-static const SpeculatedType SpecDirectArguments    = 1ull << 12; // It's definitely a DirectArguments object.
>-static const SpeculatedType SpecScopedArguments    = 1ull << 13; // It's definitely a ScopedArguments object.
>-static const SpeculatedType SpecStringObject       = 1ull << 14; // It's definitely a StringObject.
>-static const SpeculatedType SpecRegExpObject       = 1ull << 15; // It's definitely a RegExpObject (and not any subclass of RegExpObject).
>-static const SpeculatedType SpecMapObject          = 1ull << 16; // It's definitely a Map object or one of its subclasses.
>-static const SpeculatedType SpecSetObject          = 1ull << 17; // It's definitely a Set object or one of its subclasses.
>-static const SpeculatedType SpecWeakMapObject      = 1ull << 18; // It's definitely a WeakMap object or one of its subclasses.
>-static const SpeculatedType SpecWeakSetObject      = 1ull << 19; // It's definitely a WeakSet object or one of its subclasses.
>-static const SpeculatedType SpecProxyObject        = 1ull << 20; // It's definitely a Proxy object or one of its subclasses.
>-static const SpeculatedType SpecDerivedArray       = 1ull << 21; // It's definitely a DerivedArray object.
>-static const SpeculatedType SpecObjectOther        = 1ull << 22; // It's definitely an object but not JSFinalObject, JSArray, or JSFunction.
>-static const SpeculatedType SpecObject             = SpecFinalObject | SpecArray | SpecFunction | SpecTypedArrayView | SpecDirectArguments | SpecScopedArguments | SpecStringObject | SpecRegExpObject | SpecMapObject | SpecSetObject | SpecWeakMapObject | SpecWeakSetObject | SpecProxyObject | SpecDerivedArray | SpecObjectOther; // Bitmask used for testing for any kind of object prediction.
>-static const SpeculatedType SpecStringIdent        = 1ull << 23; // It's definitely a JSString, and it's an identifier.
>-static const SpeculatedType SpecStringVar          = 1ull << 24; // It's definitely a JSString, and it's not an identifier.
>-static const SpeculatedType SpecString             = SpecStringIdent | SpecStringVar; // It's definitely a JSString.
>-static const SpeculatedType SpecSymbol             = 1ull << 25; // It's definitely a Symbol.
>-static const SpeculatedType SpecCellOther          = 1ull << 26; // It's definitely a JSCell but not a subclass of JSObject and definitely not a JSString, BigInt, or Symbol.
>-static const SpeculatedType SpecBoolInt32          = 1ull << 27; // It's definitely an Int32 with value 0 or 1.
>-static const SpeculatedType SpecNonBoolInt32       = 1ull << 28; // It's definitely an Int32 with value other than 0 or 1.
>-static const SpeculatedType SpecInt32Only          = SpecBoolInt32 | SpecNonBoolInt32; // It's definitely an Int32.
>-static const SpeculatedType SpecInt52Only          = 1ull << 29; // It's definitely an Int52 and we intend it to unbox it. It's also definitely not an Int32.
>-static const SpeculatedType SpecAnyInt             = SpecInt32Only | SpecInt52Only; // It's something that we can do machine int arithmetic on.
>-static const SpeculatedType SpecAnyIntAsDouble     = 1ull << 30; // It's definitely an Int52 and it's inside a double.
>-static const SpeculatedType SpecNonIntAsDouble     = 1ull << 31; // It's definitely not an Int52 but it's a real number and it's a double.
>-static const SpeculatedType SpecDoubleReal         = SpecNonIntAsDouble | SpecAnyIntAsDouble; // It's definitely a non-NaN double.
>-static const SpeculatedType SpecDoublePureNaN      = 1ull << 32; // It's definitely a NaN that is safe to tag (i.e. pure).
>-static const SpeculatedType SpecDoubleImpureNaN    = 1ull << 33; // It's definitely a NaN that is unsafe to tag (i.e. impure).
>-static const SpeculatedType SpecDoubleNaN          = SpecDoublePureNaN | SpecDoubleImpureNaN; // It's definitely some kind of NaN.
>-static const SpeculatedType SpecBytecodeDouble     = SpecDoubleReal | SpecDoublePureNaN; // It's either a non-NaN or a NaN double, but it's definitely not impure NaN.
>-static const SpeculatedType SpecFullDouble         = SpecDoubleReal | SpecDoubleNaN; // It's either a non-NaN or a NaN double.
>-static const SpeculatedType SpecBytecodeRealNumber = SpecInt32Only | SpecDoubleReal; // It's either an Int32 or a DoubleReal.
>-static const SpeculatedType SpecFullRealNumber     = SpecAnyInt | SpecDoubleReal; // It's either an Int32 or a DoubleReal, or a Int52.
>-static const SpeculatedType SpecBytecodeNumber     = SpecInt32Only | SpecBytecodeDouble; // It's either an Int32 or a Double, and the Double cannot be an impure NaN.
>-static const SpeculatedType SpecFullNumber         = SpecAnyInt | SpecFullDouble; // It's either an Int32, Int52, or a Double, and the Double can be impure NaN.
>-static const SpeculatedType SpecBoolean            = 1ull << 34; // It's definitely a Boolean.
>-static const SpeculatedType SpecOther              = 1ull << 35; // It's definitely either Null or Undefined.
>-static const SpeculatedType SpecMisc               = SpecBoolean | SpecOther; // It's definitely either a boolean, Null, or Undefined.
>-static const SpeculatedType SpecEmpty              = 1ull << 36; // It's definitely an empty value marker.
>-static const SpeculatedType SpecBigInt             = 1ull << 37; // It's definitely a BigInt.
>-static const SpeculatedType SpecPrimitive          = SpecString | SpecSymbol | SpecBytecodeNumber | SpecMisc | SpecBigInt; // It's any non-Object JSValue.
>-static const SpeculatedType SpecCell               = SpecObject | SpecString | SpecSymbol | SpecCellOther | SpecBigInt; // It's definitely a JSCell.
>-static const SpeculatedType SpecHeapTop            = SpecCell | SpecBytecodeNumber | SpecMisc; // It can be any of the above, except for SpecInt52Only and SpecDoubleImpureNaN.
>-static const SpeculatedType SpecBytecodeTop        = SpecHeapTop | SpecEmpty; // It can be any of the above, except for SpecInt52Only and SpecDoubleImpureNaN. Corresponds to what could be found in a bytecode local.
>-static const SpeculatedType SpecFullTop            = SpecBytecodeTop | SpecFullNumber; // It can be anything that bytecode could see plus exotic encodings of numbers.
>+static const SpeculatedType SpecNone                              = 0; // We don't know anything yet.
>+static const SpeculatedType SpecFinalObject                       = 1ull << 0; // It's definitely a JSFinalObject.
>+static const SpeculatedType SpecArray                             = 1ull << 1; // It's definitely a JSArray.
>+static const SpeculatedType SpecFunctionWithDefaultHasInstance    = 1ull << 2; // It's definitely a JSFunction that has its ImplementsDefaultHasInstance type info flags bit set.
>+static const SpeculatedType SpecFunctionWithNonDefaultHasInstance = 1ull << 3; // It's definitely a JSFunction that has does not have its ImplementsDefaultHasInstance bit set.
>+static const SpeculatedType SpecFunction                          = SpecFunctionWithDefaultHasInstance | SpecFunctionWithNonDefaultHasInstance; // It's definitely a JSFunction.
>+static const SpeculatedType SpecInt8Array                         = 1ull << 4; // It's definitely an Int8Array or one of its subclasses.
>+static const SpeculatedType SpecInt16Array                        = 1ull << 5; // It's definitely an Int16Array or one of its subclasses.
>+static const SpeculatedType SpecInt32Array                        = 1ull << 6; // It's definitely an Int32Array or one of its subclasses.
>+static const SpeculatedType SpecUint8Array                        = 1ull << 7; // It's definitely an Uint8Array or one of its subclasses.
>+static const SpeculatedType SpecUint8ClampedArray                 = 1ull << 8; // It's definitely an Uint8ClampedArray or one of its subclasses.
>+static const SpeculatedType SpecUint16Array                       = 1ull << 9; // It's definitely an Uint16Array or one of its subclasses.
>+static const SpeculatedType SpecUint32Array                       = 1ull << 10; // It's definitely an Uint32Array or one of its subclasses.
>+static const SpeculatedType SpecFloat32Array                      = 1ull << 11; // It's definitely an Uint16Array or one of its subclasses.
>+static const SpeculatedType SpecFloat64Array                      = 1ull << 12; // It's definitely an Uint16Array or one of its subclasses.
>+static const SpeculatedType SpecTypedArrayView                    = SpecInt8Array | SpecInt16Array | SpecInt32Array | SpecUint8Array | SpecUint8ClampedArray | SpecUint16Array | SpecUint32Array | SpecFloat32Array | SpecFloat64Array;
>+static const SpeculatedType SpecDirectArguments                   = 1ull << 13; // It's definitely a DirectArguments object.
>+static const SpeculatedType SpecScopedArguments                   = 1ull << 14; // It's definitely a ScopedArguments object.
>+static const SpeculatedType SpecStringObject                      = 1ull << 15; // It's definitely a StringObject.
>+static const SpeculatedType SpecRegExpObject                      = 1ull << 16; // It's definitely a RegExpObject (and not any subclass of RegExpObject).
>+static const SpeculatedType SpecMapObject                         = 1ull << 17; // It's definitely a Map object or one of its subclasses.
>+static const SpeculatedType SpecSetObject                         = 1ull << 18; // It's definitely a Set object or one of its subclasses.
>+static const SpeculatedType SpecWeakMapObject                     = 1ull << 19; // It's definitely a WeakMap object or one of its subclasses.
>+static const SpeculatedType SpecWeakSetObject                     = 1ull << 20; // It's definitely a WeakSet object or one of its subclasses.
>+static const SpeculatedType SpecProxyObject                       = 1ull << 21; // It's definitely a Proxy object or one of its subclasses.
>+static const SpeculatedType SpecDerivedArray                      = 1ull << 22; // It's definitely a DerivedArray object.
>+static const SpeculatedType SpecObjectOther                       = 1ull << 23; // It's definitely an object but not JSFinalObject, JSArray, or JSFunction.
>+static const SpeculatedType SpecObject                            = SpecFinalObject | SpecArray | SpecFunction | SpecTypedArrayView | SpecDirectArguments | SpecScopedArguments | SpecStringObject | SpecRegExpObject | SpecMapObject | SpecSetObject | SpecWeakMapObject | SpecWeakSetObject | SpecProxyObject | SpecDerivedArray | SpecObjectOther; // Bitmask used for testing for any kind of object prediction.
>+static const SpeculatedType SpecStringIdent                       = 1ull << 24; // It's definitely a JSString, and it's an identifier.
>+static const SpeculatedType SpecStringVar                         = 1ull << 25; // It's definitely a JSString, and it's not an identifier.
>+static const SpeculatedType SpecString                            = SpecStringIdent | SpecStringVar; // It's definitely a JSString.
>+static const SpeculatedType SpecSymbol                            = 1ull << 26; // It's definitely a Symbol.
>+static const SpeculatedType SpecCellOther                         = 1ull << 27; // It's definitely a JSCell but not a subclass of JSObject and definitely not a JSString, BigInt, or Symbol.
>+static const SpeculatedType SpecBoolInt32                         = 1ull << 28; // It's definitely an Int32 with value 0 or 1.
>+static const SpeculatedType SpecNonBoolInt32                      = 1ull << 29; // It's definitely an Int32 with value other than 0 or 1.
>+static const SpeculatedType SpecInt32Only                         = SpecBoolInt32 | SpecNonBoolInt32; // It's definitely an Int32.
>+static const SpeculatedType SpecInt52Only                         = 1ull << 30; // It's definitely an Int52 and we intend it to unbox it. It's also definitely not an Int32.
>+static const SpeculatedType SpecAnyInt                            = SpecInt32Only | SpecInt52Only; // It's something that we can do machine int arithmetic on.
>+static const SpeculatedType SpecAnyIntAsDouble                    = 1ull << 31; // It's definitely an Int52 and it's inside a double.
>+static const SpeculatedType SpecNonIntAsDouble                    = 1ull << 32; // It's definitely not an Int52 but it's a real number and it's a double.
>+static const SpeculatedType SpecDoubleReal                        = SpecNonIntAsDouble | SpecAnyIntAsDouble; // It's definitely a non-NaN double.
>+static const SpeculatedType SpecDoublePureNaN                     = 1ull << 33; // It's definitely a NaN that is safe to tag (i.e. pure).
>+static const SpeculatedType SpecDoubleImpureNaN                   = 1ull << 34; // It's definitely a NaN that is unsafe to tag (i.e. impure).
>+static const SpeculatedType SpecDoubleNaN                         = SpecDoublePureNaN | SpecDoubleImpureNaN; // It's definitely some kind of NaN.
>+static const SpeculatedType SpecBytecodeDouble                    = SpecDoubleReal | SpecDoublePureNaN; // It's either a non-NaN or a NaN double, but it's definitely not impure NaN.
>+static const SpeculatedType SpecFullDouble                        = SpecDoubleReal | SpecDoubleNaN; // It's either a non-NaN or a NaN double.
>+static const SpeculatedType SpecBytecodeRealNumber                = SpecInt32Only | SpecDoubleReal; // It's either an Int32 or a DoubleReal.
>+static const SpeculatedType SpecFullRealNumber                    = SpecAnyInt | SpecDoubleReal; // It's either an Int32 or a DoubleReal, or a Int52.
>+static const SpeculatedType SpecBytecodeNumber                    = SpecInt32Only | SpecBytecodeDouble; // It's either an Int32 or a Double, and the Double cannot be an impure NaN.
>+static const SpeculatedType SpecFullNumber                        = SpecAnyInt | SpecFullDouble; // It's either an Int32, Int52, or a Double, and the Double can be impure NaN.
>+static const SpeculatedType SpecBoolean                           = 1ull << 35; // It's definitely a Boolean.
>+static const SpeculatedType SpecOther                             = 1ull << 36; // It's definitely either Null or Undefined.
>+static const SpeculatedType SpecMisc                              = SpecBoolean | SpecOther; // It's definitely either a boolean, Null, or Undefined.
>+static const SpeculatedType SpecEmpty                             = 1ull << 37; // It's definitely an empty value marker.
>+static const SpeculatedType SpecBigInt                            = 1ull << 38; // It's definitely a BigInt.
>+static const SpeculatedType SpecPrimitive                         = SpecString | SpecSymbol | SpecBytecodeNumber | SpecMisc | SpecBigInt; // It's any non-Object JSValue.
>+static const SpeculatedType SpecCell                              = SpecObject | SpecString | SpecSymbol | SpecCellOther | SpecBigInt; // It's definitely a JSCell.
>+static const SpeculatedType SpecHeapTop                           = SpecCell | SpecBytecodeNumber | SpecMisc; // It can be any of the above, except for SpecInt52Only and SpecDoubleImpureNaN.
>+static const SpeculatedType SpecBytecodeTop                       = SpecHeapTop | SpecEmpty; // It can be any of the above, except for SpecInt52Only and SpecDoubleImpureNaN. Corresponds to what could be found in a bytecode local.
>+static const SpeculatedType SpecFullTop                           = SpecBytecodeTop | SpecFullNumber; // It can be anything that bytecode could see plus exotic encodings of numbers.
> 
> // SpecCellCheck is the type set representing the values that can flow through a cell check.
> // On 64-bit platforms, the empty value passes a cell check. Also, ~SpecCellCheck is the type
>Index: Source/JavaScriptCore/dfg/DFGAbstractInterpreterInlines.h
>===================================================================
>--- Source/JavaScriptCore/dfg/DFGAbstractInterpreterInlines.h	(revision 231813)
>+++ Source/JavaScriptCore/dfg/DFGAbstractInterpreterInlines.h	(working copy)
>@@ -3437,7 +3437,6 @@ bool AbstractInterpreter<AbstractStateTy
>     case CountExecution:
>     case CheckTierUpInLoop:
>     case CheckTierUpAtReturn:
>-    case CheckTypeInfoFlags:
>     case SuperSamplerBegin:
>     case SuperSamplerEnd:
>     case CheckTierUpAndOSREnter:
>@@ -3446,6 +3445,40 @@ bool AbstractInterpreter<AbstractStateTy
>     case ExitOK:
>         break;
> 
>+    case CheckTypeInfoFlags: {
>+        if (node->typeInfoOperand() != ImplementsDefaultHasInstance)
>+            break;
>+
>+        const AbstractValue& abstractValue = forNode(node->child1());
>+
>+        if (abstractValue.m_type == SpecFunctionWithDefaultHasInstance) {
>+            m_state.setFoundConstants(true);
>+            break;
>+        }
>+
>+        if (JSValue value = abstractValue.value()) {
>+            if (value.isCell()) {
>+                // This works because if we see a cell here, we know it's fully constructed
>+                // and we can read its inline type info flags. These flags don't change over the
>+                // object's lifetime.
>+                if (value.asCell()->inlineTypeFlags() & ImplementsDefaultHasInstance) {
>+                    m_state.setFoundConstants(true);
>+                    break;
>+                }
>+            }
>+        }
>+
>+        if (abstractValue.m_structure.isFinite()) {
>+            bool ok = true;
>+            abstractValue.m_structure.forEach([&] (RegisteredStructure structure) {
>+                ok &= structure->typeInfo().implementsDefaultHasInstance();
>+            });
>+            if (ok)
>+                m_state.setFoundConstants(true);
>+        }
>+        break;
>+    }
>+
>     case ParseInt: {
>         AbstractValue value = forNode(node->child1());
>         if (value.m_type && !(value.m_type & ~SpecInt32Only)) {
>Index: Source/JavaScriptCore/dfg/DFGConstantFoldingPhase.cpp
>===================================================================
>--- Source/JavaScriptCore/dfg/DFGConstantFoldingPhase.cpp	(revision 231813)
>+++ Source/JavaScriptCore/dfg/DFGConstantFoldingPhase.cpp	(working copy)
>@@ -806,6 +806,46 @@ private:
>                 }
>                 break;
>             }
>+
>+            case CheckTypeInfoFlags: {
>+                if (node->typeInfoOperand() != ImplementsDefaultHasInstance)
>+                    break;
>+
>+                const AbstractValue& abstractValue = m_state.forNode(node->child1());
>+
>+                if (abstractValue.m_type == SpecFunctionWithDefaultHasInstance) {
>+                    node->remove(m_graph);
>+                    changed = true;
>+                    break;
>+                }
>+
>+                if (JSValue value = abstractValue.value()) {
>+                    if (value.isCell()) {
>+                        // This works because if we see a cell here, we know it's fully constructed
>+                        // and we can read its inline type info flags. These flags don't change over the
>+                        // object's lifetime.
>+                        if (value.asCell()->inlineTypeFlags() & ImplementsDefaultHasInstance) {
>+                            node->remove(m_graph);
>+                            changed = true;
>+                            break;
>+                        }
>+                    }
>+                }
>+
>+                if (abstractValue.m_structure.isFinite()) {
>+                    bool ok = true;
>+                    abstractValue.m_structure.forEach([&] (RegisteredStructure structure) {
>+                        ok &= structure->typeInfo().implementsDefaultHasInstance();
>+                    });
>+                    if (ok) {
>+                        node->remove(m_graph);
>+                        changed = true;
>+                        break;
>+                    }
>+                }
>+
>+                break;
>+            }
>                 
>             case PhantomNewObject:
>             case PhantomNewFunction:
>Index: Source/JavaScriptCore/dfg/DFGStrengthReductionPhase.cpp
>===================================================================
>--- Source/JavaScriptCore/dfg/DFGStrengthReductionPhase.cpp	(revision 231813)
>+++ Source/JavaScriptCore/dfg/DFGStrengthReductionPhase.cpp	(working copy)
>@@ -303,7 +303,7 @@ private:
>             break;
>         }
> 
>-        // FIXME: we should probably do this in constant folding but this currently relies on an OSR exit rule.
>+        // FIXME: we should probably do this in constant folding but this currently relies on OSR exit history:
>         // https://bugs.webkit.org/show_bug.cgi?id=154832
>         case OverridesHasInstance: {
>             if (!m_node->child2().node()->isCellConstant())
>Index: Source/JavaScriptCore/runtime/JSFunction.cpp
>===================================================================
>--- Source/JavaScriptCore/runtime/JSFunction.cpp	(revision 231813)
>+++ Source/JavaScriptCore/runtime/JSFunction.cpp	(working copy)
>@@ -100,6 +100,7 @@ JSFunction::JSFunction(VM& vm, JSGlobalO
>     : Base(vm, globalObject, structure)
>     , m_executable()
> {
>+    assertTypeInfoFlagInvariants();
> }
> 
> 
>@@ -789,4 +790,16 @@ JSFunction::PropertyStatus JSFunction::r
>     return PropertyStatus::Reified;
> }
> 
>+#if !ASSERT_DISABLED
>+void JSFunction::assertTypeInfoFlagInvariants()
>+{
>+    // If you change this, you'll need to update speculationFromClassInfo.
>+    const ClassInfo* info = classInfo(*vm());
>+    if (!(inlineTypeFlags() & ImplementsDefaultHasInstance))
>+        RELEASE_ASSERT(info == JSBoundFunction::info());
>+    else
>+        RELEASE_ASSERT(info != JSBoundFunction::info());
>+}
>+#endif
>+
> } // namespace JSC
>Index: Source/JavaScriptCore/runtime/JSFunction.h
>===================================================================
>--- Source/JavaScriptCore/runtime/JSFunction.h	(revision 231813)
>+++ Source/JavaScriptCore/runtime/JSFunction.h	(working copy)
>@@ -208,6 +208,12 @@ private:
>     PropertyStatus reifyLazyNameIfNeeded(VM&, ExecState*, PropertyName);
>     PropertyStatus reifyLazyBoundNameIfNeeded(VM&, ExecState*, PropertyName);
> 
>+#if ASSERT_DISABLED
>+    void assertTypeInfoFlagInvariants() { }
>+#else
>+    void assertTypeInfoFlagInvariants();
>+#endif
>+
>     friend class LLIntOffsetsExtractor;
> 
>     static EncodedJSValue argumentsGetter(ExecState*, EncodedJSValue, PropertyName);
>Index: Source/JavaScriptCore/runtime/JSFunctionInlines.h
>===================================================================
>--- Source/JavaScriptCore/runtime/JSFunctionInlines.h	(revision 231813)
>+++ Source/JavaScriptCore/runtime/JSFunctionInlines.h	(working copy)
>@@ -43,6 +43,7 @@ inline JSFunction::JSFunction(VM& vm, Fu
>     , m_executable(vm, this, executable)
>     , m_rareData()
> {
>+    assertTypeInfoFlagInvariants();
> }
> 
> inline FunctionExecutable* JSFunction::jsExecutable() const

Flags:

ysuzuki: review+

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Attachments on bug 185670: 340466 | 340543