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Always generate new shapes when setting uncacheable flags after prototype changes, don't cache native iterators for objects with uncacheable prototypes, bug 705895.

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This commit is contained in:
Brian Hackett 2011-11-28 17:27:00 -08:00
parent e970326d58
commit 031d257786
5 changed files with 31 additions and 6 deletions
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11
js/src/jit-test/tests/basic/bug705895-1.js Normal file
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@ -0,0 +1,11 @@
c = (0).__proto__
function f(o) {
o.__proto__ = null
for (x in o) {}
}
for (i = 0; i < 9; i++) {
f(c)
Function.prototype.__proto__.__proto__ = c
for (x in Function.prototype.__proto__) {}
f(Math.__proto__)
}

13
js/src/jit-test/tests/basic/bug705895-2.js Normal file
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@ -0,0 +1,13 @@
// |jit-test| error: TypeError
function f(o) {
for (j = 0; j < 9; j++) {
if (j) {
o.__proto__ = null
}
for (v in o) {}
}
}
for (i = 0; i < 9; i++) {
(new Boolean).__proto__.__defineGetter__("toString", function() {})
f(Boolean.prototype)
}

1
js/src/jsiter.cpp
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@ -622,6 +622,7 @@ GetIterator(JSContext *cx, JSObject *obj, uintN flags, Value *vp)
JSObject *pobj = obj;
do {
if (!pobj->isNative() ||
pobj->hasUncacheableProto() ||
obj->getOps()->enumerate ||
pobj->getClass()->enumerate != JS_EnumerateStub) {
shapes.clear();

4
js/src/jsscope.cpp
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@ -1193,9 +1193,9 @@ JSObject::protoShapeChange(JSContext *cx)
* See ResolvePrototype in dom/base/nsDOMClassInfo.cpp.
*/
if (!lastProperty()->hasObjectFlag(BaseShape::CHANGED_PROTO))
return setFlag(cx, BaseShape::CHANGED_PROTO);
return setFlag(cx, BaseShape::CHANGED_PROTO, GENERATE_SHAPE);
return setFlag(cx, js::BaseShape::UNCACHEABLE_PROTO);
return setFlag(cx, BaseShape::UNCACHEABLE_PROTO, GENERATE_SHAPE);
}
bool

8
js/src/methodjit/Compiler.cpp
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@ -6055,8 +6055,8 @@ mjit::Compiler::iter(uintN flags)
/* Compare shape of object with iterator. */
masm.loadShape(reg, T1);
masm.loadPtr(Address(nireg, offsetof(NativeIterator, shapes_array)), T2);
masm.load32(Address(T2, 0), T2);
Jump mismatchedObject = masm.branch32(Assembler::NotEqual, T1, T2);
masm.loadPtr(Address(T2, 0), T2);
Jump mismatchedObject = masm.branchPtr(Assembler::NotEqual, T1, T2);
stubcc.linkExit(mismatchedObject, Uses(1));
/* Compare shape of object's prototype with iterator. */
@ -6064,8 +6064,8 @@ mjit::Compiler::iter(uintN flags)
masm.loadPtr(Address(T1, offsetof(types::TypeObject, proto)), T1);
masm.loadShape(T1, T1);
masm.loadPtr(Address(nireg, offsetof(NativeIterator, shapes_array)), T2);
masm.load32(Address(T2, sizeof(uint32)), T2);
Jump mismatchedProto = masm.branch32(Assembler::NotEqual, T1, T2);
masm.loadPtr(Address(T2, sizeof(Shape *)), T2);
Jump mismatchedProto = masm.branchPtr(Assembler::NotEqual, T1, T2);
stubcc.linkExit(mismatchedProto, Uses(1));
/*