TALLOC
compile_stack.stack = TALLOC (INIT_COMPILE_STACK_SIZE, compile_stack_elt_t);
bufp->buffer = TALLOC (INIT_BUF_SIZE, unsigned char);
regs->start = TALLOC (regs->num_regs, regoff_t);
regs->end = TALLOC (regs->num_regs, regoff_t);
regs.start = TALLOC (nmatch, regoff_t);
regs.end = TALLOC (nmatch, regoff_t);