Computer Systems: A Programmer's Perspective340/ 1078231%+3.67Consider the following union declaration:union ele {struct {int *p;int y;} e1;struct {int x;union ele *next;} e2;};This declaration illustrates that structures can be embedded within unions.The following procedure (with some expressions omitted) operates on alinked list having these unions as list elements:void proc (union ele *up){= *(up->up->}up->II Computer Systems: A Programmer's Perspective341/ 1078239%+A. What would be the offsets (in bytes) of the following fields:e1.p:e1.y:e2.x:e2.next:B. How many total bytes would the structure require?C. The compiler generates the following assembly code for the body of proc:up at %ebp+88(%ebp), %edx4(%edx), %ecx(%ecx), %eax(%eax), %eax1movlmovl3movl4movl(%edx), %eax%eax, 4(%ecx)sublmovlOn the basis of this information, fill in the missing expressions in the codeHint: Some union references can have ambiguous interpretations.These ambiguities get resolved as you see where the references lead. Thereis only one answer that does not perform any casting and does not violateforproc.any type constraints.II

Computer Systems: A Programmer's Perspective 340 / 1078 231% 3.67 Consider the following union declaration: union ele { struct { int *p; int y; } e1; struct { int x; union ele *next; } e2; }; This declaration illustrates that structures can be em dded wi in unions The following procedure (with some expressions omitted) operates on a linked list having these unions as list elements: void proc (union ele *up) { up-> } * (up->. - up->. %3D

Computer Systems: A Programmer's Perspective 340 / 1078 231% 3.67 Consider the following union declaration: union ele { struct { int p; int y; } e1; struct { int x; union ele next; } e2; }; This declaration illustrates that structures can be em dded wi in unions The following procedure (with some expressions omitted) operates on a linked list having these unions as list elements: void proc (union ele up) { up-> } (up->. - up->. %3D

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Concept explainers

Types of Linked List

A sequence of data elements connected through links is called a linked list (LL). The elements of a linked list are nodes containing data and a reference to the next node in the list. In a linked list, the elements are stored in a non-contiguous manner and the linear order in maintained by means of a pointer associated with each node in the list which is used to point to the subsequent node in the list.

Linked List

When a set of items is organized sequentially, it is termed as list. Linked list is a list whose order is given by links from one item to the next. It contains a link to the structure containing the next item so we can say that it is a completely different way to represent a list. In linked list, each structure of the list is known as node and it consists of two fields (one for containing the item and other one is for containing the next item address).

Question

Computer Systems: A Programmer's Perspective
340
/ 1078
231%
+
3.67
Consider the following union declaration:
union ele {
struct {
int *p;
int y;
} e1;
struct {
int x;
union ele *next;
} e2;
};
This declaration illustrates that structures can be embedded within unions.
The following procedure (with some expressions omitted) operates on a
linked list having these unions as list elements:
void proc (union ele *up)
{
= *(up->
up->
}
up->
II

Computer Systems: A Programmer's Perspective
341
/ 1078
239%
+
A. What would be the offsets (in bytes) of the following fields:
e1.p:
e1.y:
e2.x:
e2.next:
B. How many total bytes would the structure require?
C. The compiler generates the following assembly code for the body of proc:
up at %ebp+8
8(%ebp), %edx
4(%edx), %ecx
(%ecx), %eax
(%eax), %eax
1
movl
movl
3
movl
4
movl
(%edx), %eax
%eax, 4(%ecx)
subl
movl
On the basis of this information, fill in the missing expressions in the code
Hint: Some union references can have ambiguous interpretations.
These ambiguities get resolved as you see where the references lead. There
is only one answer that does not perform any casting and does not violate
for
proc.
any type constraints.
II

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