NEW PERSP.ON COMP.CONCEPTS-PACKAGE
NEW PERSP.ON COMP.CONCEPTS-PACKAGE
17th Edition
ISBN: 9781337761116
Author: Carey
Publisher: CENGAGE L
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Chapter 3.3, Problem 1QC
Program Plan Intro

To differentiate between Relative positioning and absolute positioning used in the CSS style.

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Given the variables and code in the text below, identify where in memory they will live once the code is compiled. 1 char big_array [1L<<24]; /* 16 MB */ 2 GB * :/ 2 char huge_array [1L<<31]; /* 3 4 int global = 0; 5 6 int useless () { return 0; } 7 8 int main() 9 { 10 void *p1, p2, *p3, *p4; int local = 0; malloc (1L << 28); /* 256 MB *, 11 12 p1 13 p2 = malloc (1L << 8); /* 256 B * 14 p3 15 p4 = malloc (1L << 32); malloc (1L << 8); /* 4 GB * */ /* 256 B */ 16 } Note: *pN is the thing at which pN points. 1. big_array 2. huge_array 3. global 4. useless 5. void* p1 6. *p1 7. void* p2 8. *p2 9. void* p3 10. *p3 11. void* p4 12. *p4
The next problem concerns the following C code: /copy input string x to buf */ void foo (char *x) { char buf [8]; strcpy((char *) buf, x); } void callfoo() { } foo("ZYXWVUTSRQPONMLKJIHGFEDCBA"); Here is the corresponding machine code on a Linux/x86 machine: 0000000000400530 : 400530: 48 83 ec 18 sub $0x18,%rsp 400534: 48 89 fe mov %rdi, %rsi 400537: 48 89 e7 mov %rsp,%rdi 40053a: e8 di fe ff ff callq 400410 40053f: 48 83 c4 18 add $0x18,%rsp 400543: c3 retq 400544: 0000000000400544 : 48 83 ec 08 sub $0x8,%rsp 400548: bf 00 06 40 00 mov $0x400600,%edi 40054d: e8 de ff ff ff callq 400530 400552: 48 83 c4 08 add $0x8,%rsp 400556: c3 This problem tests your understanding of the program stack. Here are some notes to help you work the problem: ⚫ strcpy(char *dst, char *src) copies the string at address src (including the terminating '\0' character) to address dst. It does not check the size of the destination buffer. • You will need to know the hex values of the following characters:
Consider the following assembly code for a C for loop: movl $0, %eax jmp .L2 .L3: addq $1, %rdi addq %rsi, %rax subq $1, %rsi .L2: cmpq %rsi, %rdi jl .L3 addq ret %rdi, %rax Based on the assembly code above, fill in the blanks below in its corresponding C source code. Recall that registers %rdi and %rsi contain the first and second, respectively, argument of a function. (Note: you may only use the symbolic variables x, y, and result in your expressions below do not use register names.) long loop (long x, long y) { long result; } for ( } return result; __; y--) {

Chapter 3 Solutions

NEW PERSP.ON COMP.CONCEPTS-PACKAGE

Ch. 3.2 - Prob. 2QCCh. 3.2 - Prob. 3QCCh. 3.2 - Prob. 4QCCh. 3.2 - Prob. 5QCCh. 3.2 - Prob. 6QCCh. 3.2 - Prob. 7QCCh. 3.2 - Prob. 8QCCh. 3.2 - Prob. 9QCCh. 3.3 - Prob. 1QCCh. 3.3 - Prob. 2QCCh. 3.3 - Prob. 3QCCh. 3.3 - Prob. 4QCCh. 3.3 - Prob. 5QCCh. 3.3 - Prob. 6QCCh. 3.3 - Prob. 7QCCh. 3 - Prob. 1RACh. 3 - Prob. 2RACh. 3 - Prob. 3RACh. 3 - Prob. 4RACh. 3 - Prob. 5RACh. 3 - Prob. 6RACh. 3 - Prob. 7RACh. 3 - Prob. 8RACh. 3 - Prob. 9RACh. 3 - Prob. 10RACh. 3 - Prob. 11RACh. 3 - Prob. 12RACh. 3 - Prob. 13RACh. 3 - Prob. 14RACh. 3 - Prob. 15RACh. 3 - Prob. 16RACh. 3 - Prob. 1CP1Ch. 3 - Prob. 2CP1Ch. 3 - Prob. 3CP1Ch. 3 - Prob. 4CP1Ch. 3 - Prob. 5CP1Ch. 3 - Prob. 6CP1Ch. 3 - Prob. 7CP1Ch. 3 - Prob. 8CP1Ch. 3 - Prob. 9CP1Ch. 3 - Prob. 10CP1Ch. 3 - Prob. 11CP1Ch. 3 - Prob. 12CP1Ch. 3 - Prob. 13CP1Ch. 3 - Prob. 14CP1Ch. 3 - Prob. 15CP1Ch. 3 - Prob. 16CP1Ch. 3 - Prob. 17CP1Ch. 3 - Prob. 18CP1Ch. 3 - Prob. 19CP1Ch. 3 - Prob. 20CP1Ch. 3 - Prob. 1CP2Ch. 3 - Prob. 2CP2Ch. 3 - Prob. 3CP2Ch. 3 - Prob. 4CP2Ch. 3 - Prob. 5CP2Ch. 3 - Prob. 6CP2Ch. 3 - Prob. 7CP2Ch. 3 - Prob. 8CP2Ch. 3 - Prob. 9CP2Ch. 3 - Prob. 10CP2Ch. 3 - Prob. 11CP2Ch. 3 - Prob. 12CP2Ch. 3 - Prob. 13CP2Ch. 3 - Prob. 14CP2Ch. 3 - Prob. 15CP2Ch. 3 - Prob. 16CP2Ch. 3 - Prob. 17CP2Ch. 3 - Prob. 18CP2Ch. 3 - Prob. 19CP2Ch. 3 - Prob. 20CP2Ch. 3 - Prob. 1CP3Ch. 3 - Prob. 2CP3Ch. 3 - Prob. 3CP3Ch. 3 - Prob. 4CP3Ch. 3 - Prob. 5CP3Ch. 3 - Prob. 6CP3Ch. 3 - Prob. 7CP3Ch. 3 - Prob. 8CP3Ch. 3 - Prob. 9CP3Ch. 3 - Prob. 10CP3Ch. 3 - Prob. 11CP3Ch. 3 - Prob. 12CP3Ch. 3 - Prob. 13CP3Ch. 3 - Prob. 14CP3Ch. 3 - Prob. 1CP4Ch. 3 - Prob. 2CP4Ch. 3 - Prob. 3CP4Ch. 3 - Prob. 4CP4Ch. 3 - Prob. 5CP4Ch. 3 - Prob. 6CP4
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