question archive Explain all your steps and explain how do you determine the answer! The table on the back page shows the addresses and contents of some selection of blocks on a heap on a big-endian machine

Explain all your steps and explain how do you determine the answer! The table on the back page shows the addresses and contents of some selection of blocks on a heap on a big-endian machine

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Explain all your steps and explain how do you determine the answer!

The table on the back page shows the addresses and contents of some selection of blocks on a heap on
a big-endian machine. The header/footer struct is exactly as, i.e.

struct header {
unsigned int length :29,
unsigned int NOT_USED :2,
unsigned int allocated :1         /* 1 means ALLOCATED */
};                                                /* 0 means FREE */

any additional pointers, if they exist, would be stored in the order: PREVIOUS, NEXT.

1. What is the address of the header of the first allocated block?
2. What is its length?
3. How much user-data can be stored in this block?
4. What was the address returned by malloc( ) when this header was set?
5. What is the address of the header of the first free block?
6. What is its length (including header and footers)?
7. How much data could potentially be stored in this block?
8. If this heap uses a simple explicit free list, what is the address of the next free block?

 

Address Value
0x1770  0x00000011
0x1774 0x000000ad
0x1778 0x000000e4
0x177c 0x00000011
0x1780 0x00000010
0x1784 0x00000000
0x1788 0x000017a8
0x178c 0x00000010
0x1790 0x00000019
0x1794 0x0000001b
0x1798 0x000000db
0x179c 0x000000b4
0x17a0 0x0000004a
0x17a4 0x00000019
0x17a8 0x00000010
0x17ac 0x00001780
0x17b0 0x00000000
0x17b4 0x00000010
0x17b8 0x00000019
0x17bc 0x0000000e
0x17c0 0x0000005b
0x17c4 0x0000004b
0x17c8 0x0000007f
0x17cc 0x00000019
0x17d0 0x00000011
0x17d4 0x000000bf
0x17d8 0x0000005e
0x17dc 0x00000011

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