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10.21 Consider the Java program shown in Figure 10.8. Assume that this is to be compiled to native code on a machine with 4-byte addresses. (a) Draw a picture of the layout in memory of the object created at line 15. Show all virtual function tables. (b) Give assembly-level pseudocode for the call to c.val at line 18. You may assume that the address of c is in register r1 immediately before the call, and that this same register should be used to pass the hidden this parameter. You may ignore the need to save and restore registers, and don't worry about where to put the return value. 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. interface Pingable { } public void ping(); class Counter implements Pingable { int count = 0; public void ping() { ++count; } } public int val() { return count; public class Ping { public static void main(String args[]) { Counter c= new Counter(); 13. 14. 15. 16. 17. 18. 19. 20. 21. } Figure 10.8 A simple program in Java. } c.ping(); c.ping(); int v= c.val(); System.out.println (v);

10.21 Consider the Java program shown in Figure 10.8. Assume that this is to be compiled to native code on a machine with 4-byte addresses. (a) Draw a picture of the layout in memory of the object created at line 15. Show all virtual function tables. (b) Give assembly-level pseudocode for the call to c.val at line 18. You may assume that the address of c is in register r1 immediately before the call, and that this same register should be used to pass the hidden this parameter. You may ignore the need to save and restore registers, and don't worry about where to put the return value. 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. interface Pingable { } public void ping(); class Counter implements Pingable { int count = 0; public void ping() { ++count; } } public int val() { return count; public class Ping { public static void main(String args[]) { Counter c= new Counter(); 13. 14. 15. 16. 17. 18. 19. 20. 21. } Figure 10.8 A simple program in Java. } c.ping(); c.ping(); int v= c.val(); System.out.println (v);

Database System Concepts
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
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Please help me with this Principles of programming language homework question
10.21 Consider the Java program shown in Figure 10.8. Assume that this is to be compiled to native code on a machine with 4-byte addresses. (a) Draw a picture of the layout in memory of the object created at line 15. Show all virtual function tables. register (b) Give assembly-level pseudocode for the call to c.val at line 18. You may assume that the address of c is in register r1 immediately before the call, and that this same should be used to pass the hidden this parameter. You may ignore the need to save and restore registers, and don't worry about where to put the return value. 1. 2. 3. 4. 5. 6. Ó NOIN MISCH 9. 10. 11. 12. interface Pingable { 14. 15. public void ping(); } class Counter implements Pingable { int count = 0; public void ping() { ++count; } } public int val() { return count; } 13. public class Ping { public static void main(String args[]) { Counter c= new Counter(); 16. 17. 18. 19. 20. 21. } Figure 10.8 A simple program in Java. c.ping(); c.ping(); int v= c.val(); System.out.println(v); } ID No.
Transcribed Image Text:10.21 Consider the Java program shown in Figure 10.8. Assume that this is to be compiled to native code on a machine with 4-byte addresses. (a) Draw a picture of the layout in memory of the object created at line 15. Show all virtual function tables. register (b) Give assembly-level pseudocode for the call to c.val at line 18. You may assume that the address of c is in register r1 immediately before the call, and that this same should be used to pass the hidden this parameter. You may ignore the need to save and restore registers, and don't worry about where to put the return value. 1. 2. 3. 4. 5. 6. Ó NOIN MISCH 9. 10. 11. 12. interface Pingable { 14. 15. public void ping(); } class Counter implements Pingable { int count = 0; public void ping() { ++count; } } public int val() { return count; } 13. public class Ping { public static void main(String args[]) { Counter c= new Counter(); 16. 17. 18. 19. 20. 21. } Figure 10.8 A simple program in Java. c.ping(); c.ping(); int v= c.val(); System.out.println(v); } ID No.
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