For stars up to 8 times that of the Sun, they will pass through a Planetary Nebula stage, just like our Sun. Stars that begin their lives as A stars (mass range from 1.5 to just about 3 times our Sun mass) will have enough mass in their central cores to collapse and fuse Carbon into Neon or possibly Magnesium
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B stars (having mass range from 3 to 15 times our Sun) will fuse Neon or possibly Oxygen, into Magnesium, Sulfur and Silicon. All of this occurs at various stages in the ever shrinking, hot core.
Now, O stars.. They have the highest initial masses of all. O stars will fuse elements all the way to Iron at their cores! For the high mass B and all O stars, they can not become white dwarfs. Their central cores are entirely too massive. As we will soon see, an entirely different fate awaits them.