diff options
Diffstat (limited to 'projects/12/Memory.jack')
| -rw-r--r-- | projects/12/Memory.jack | 32 |
1 files changed, 12 insertions, 20 deletions
diff --git a/projects/12/Memory.jack b/projects/12/Memory.jack index b1e67ef..54e04aa 100644 --- a/projects/12/Memory.jack +++ b/projects/12/Memory.jack @@ -11,7 +11,7 @@ class Memory {
static Array memory;
static Array heap;
- static int first;
+ static int last;
/** Initializes the class. */
function void init() {
@@ -19,6 +19,8 @@ class Memory { let heap = 2048;
let heap[0] = -1;
let heap[1] = 14334;
+ let last = 0;
+ return;
}
/** Returns the RAM value at the given address. */
@@ -29,6 +31,7 @@ class Memory { /** Sets the RAM value at the given address to the given value. */
function void poke(int address, int value) {
let memory[address] = value;
+ return;
}
/** Finds an available RAM block of the given size and returns
@@ -43,8 +46,9 @@ class Memory { let current = heap[current];
}
if (current = -1) {
- String.println("Insufficient space for allocation!");
- Sys.error(1);
+ do String.println("Insufficient space for allocation!");
+ do Sys.error(1);
+ return -1;
} else {
let heap[current + 1] = heap[current + 1] - size2;
let newLast = current + heap[current + 1] + 2;
@@ -58,23 +62,11 @@ class Memory { /** De-allocates the given object (cast as an array) by making
* it available for future allocations. */
function void deAlloc(Array o) {
- var int base;
- var int current;
- var int prev;
- let prev = 0;
- let current = heap[prev];
+ var int oBase;
let oBase = o - heap - 2;
- while ((current > -1) & (~(current = oBase))){
- let prev = current;
- let current = heap[current];
- }
- if (current = -1) {
- String.println("The impossible happened");
- Sys.error(1);
- } else {
- let heap[prev] = heap[current]
- let heap[prev + 1] = heap[prev] - prev - 2;
- return;
- }
+ let heap[oBase] = -1;
+ let heap[last] = oBase;
+ let last = oBase;
+ return;
}
}
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