46         SkASSERT(fStack[3] == nullptr);  // if we assert here, the stack has overflowed  in push()
47         fStack[3] = fStack[2];  in push()
48         fStack[2] = fStack[1];  in push()
49         fStack[1] = fStack[0];  in push()
50         fStack[0] = j;  in push()
54         SkASSERT(fStack[0] == j);  // if we assert here, the pushes and pops were unbalanced  in pop()
55         fStack[0] = fStack[1];  in pop()
56         fStack[1] = fStack[2];  in pop()
57         fStack[2] = fStack[3];  in pop()
58         fStack[3] = nullptr;  in pop()
61     jmp_buf* fStack[4] = {};  member