static void
UpdateTraceHintSingle(Repatcher &repatcher, JSC::CodeLocationJump jump, JSC::CodeLocationLabel target)
{
/*
* Hack: The value that will be patched is before the executable address,
* so to get protection right, just unprotect the general region around
* the jump.
*/
repatcher.relink(jump, target);
JaegerSpew(JSpew_PICs, "relinking trace hint %p to %p\n",
jump.executableAddress(), target.executableAddress());
}
static LookupStatus
AttachSetGlobalNameStub(VMFrame &f, ic::SetGlobalNameIC *ic, JSObject *obj, const Shape *shape)
{
Assembler masm;
Label start = masm.label();
DataLabel32 shapeLabel;
Jump guard = masm.branch32WithPatch(Assembler::NotEqual, ic->shapeReg, Imm32(obj->shape()),
shapeLabel);
/* A constant object needs rematerialization. */
if (ic->objConst)
masm.move(ImmPtr(obj), ic->objReg);
JS_ASSERT(obj->branded());
/*
* Load obj->slots. If ic->objConst, then this clobbers objReg, because
* ic->objReg == ic->shapeReg.
*/
JS_ASSERT(!obj->isFixedSlot(shape->slot));
masm.loadPtr(Address(ic->objReg, JSObject::offsetOfSlots()), ic->shapeReg);
/* Test if overwriting a function-tagged slot. */
Address slot(ic->shapeReg, sizeof(Value) * obj->dynamicSlotIndex(shape->slot));
Jump isNotObject = masm.testObject(Assembler::NotEqual, slot);
/* Now, test if the object is a function object. */
masm.loadPayload(slot, ic->shapeReg);
Jump isFun = masm.testFunction(Assembler::Equal, ic->shapeReg);
/* Restore shapeReg to obj->slots, since we clobbered it. */
if (ic->objConst)
masm.move(ImmPtr(obj), ic->objReg);
masm.loadPtr(Address(ic->objReg, JSObject::offsetOfSlots()), ic->shapeReg);
/* If the object test fails, shapeReg is still obj->slots. */
isNotObject.linkTo(masm.label(), &masm);
DataLabel32 store = masm.storeValueWithAddressOffsetPatch(ic->vr, slot);
Jump done = masm.jump();
JITScript *jit = f.jit();
LinkerHelper linker(masm, JSC::METHOD_CODE);
JSC::ExecutablePool *ep = linker.init(f.cx);
if (!ep)
return Lookup_Error;
if (!jit->execPools.append(ep)) {
ep->release();
js_ReportOutOfMemory(f.cx);
return Lookup_Error;
}
if (!linker.verifyRange(jit))
return Lookup_Uncacheable;
linker.link(done, ic->fastPathStart.labelAtOffset(ic->fastRejoinOffset));
linker.link(guard, ic->slowPathStart);
linker.link(isFun, ic->slowPathStart);
JSC::CodeLocationLabel cs = linker.finalize(f);
JaegerSpew(JSpew_PICs, "generated setgname stub at %p\n", cs.executableAddress());
Repatcher repatcher(f.jit());
repatcher.relink(ic->fastPathStart.jumpAtOffset(ic->inlineShapeJump), cs);
int offset = linker.locationOf(shapeLabel) - linker.locationOf(start);
ic->extraShapeGuard = offset;
JS_ASSERT(ic->extraShapeGuard == offset);
ic->extraStub = JSC::JITCode(cs.executableAddress(), linker.size());
offset = linker.locationOf(store) - linker.locationOf(start);
ic->extraStoreOffset = offset;
JS_ASSERT(ic->extraStoreOffset == offset);
ic->hasExtraStub = true;
return Lookup_Cacheable;
}