bool
BaselineInspector::maybeInfoForPropertyOp(jsbytecode *pc,
ShapeVector &nativeShapes,
ObjectGroupVector &unboxedGroups,
ObjectGroupVector &convertUnboxedGroups)
{
// Return lists of native shapes and unboxed objects seen by the baseline
// IC for the current op. Empty lists indicate no shapes/types are known,
// or there was an uncacheable access. convertUnboxedGroups is used for
// unboxed object groups which have been seen, but have had instances
// converted to native objects and should be eagerly converted by Ion.
MOZ_ASSERT(nativeShapes.empty());
MOZ_ASSERT(unboxedGroups.empty());
MOZ_ASSERT(convertUnboxedGroups.empty());
if (!hasBaselineScript())
return true;
MOZ_ASSERT(isValidPC(pc));
const ICEntry &entry = icEntryFromPC(pc);
ICStub *stub = entry.firstStub();
while (stub->next()) {
Shape *shape = nullptr;
ObjectGroup *group = nullptr;
if (stub->isGetProp_Native()) {
shape = stub->toGetProp_Native()->shape();
} else if (stub->isSetProp_Native()) {
shape = stub->toSetProp_Native()->shape();
} else if (stub->isGetProp_Unboxed()) {
group = stub->toGetProp_Unboxed()->group();
} else if (stub->isSetProp_Unboxed()) {
group = stub->toSetProp_Unboxed()->group();
} else {
nativeShapes.clear();
unboxedGroups.clear();
return true;
}
if (group && group->unboxedLayout().nativeGroup()) {
if (!VectorAppendNoDuplicate(convertUnboxedGroups, group))
return false;
shape = group->unboxedLayout().nativeShape();
group = nullptr;
}
if (shape) {
if (!VectorAppendNoDuplicate(nativeShapes, shape))
return false;
} else {
if (!VectorAppendNoDuplicate(unboxedGroups, group))
return false;
}
stub = stub->next();
}
if (stub->isGetProp_Fallback()) {
if (stub->toGetProp_Fallback()->hadUnoptimizableAccess()) {
nativeShapes.clear();
unboxedGroups.clear();
}
} else {
if (stub->toSetProp_Fallback()->hadUnoptimizableAccess()) {
nativeShapes.clear();
unboxedGroups.clear();
}
}
// Don't inline if there are more than 5 shapes/groups.
if (nativeShapes.length() + unboxedGroups.length() > 5) {
nativeShapes.clear();
unboxedGroups.clear();
}
return true;
}
