The program debug output shows the indexes of dictionary entries, but this is insufficient for showing if the dictionary entries were removed correctly and are placed on the free stack of the dictionary for reused. Code was added to output the contents of each dictionary.
The debug text routine was added to the dictionary class that takes a header string as an argument. After appending the header string to the output string, it loops through the dictionary entries and appends the index, use count and string of every entry with a non-zero use count. After the entries, the indexes in the free stack are appended. If any free stack item contains a non-zero use count, the use count is appended after the index. Also, if the item has a non-empty string, the string is also append. The strings of deleted entries should be cleared.
The debug text dictionaries routine was added to the program model class, which calls the debug text routine of each dictionary and appends each to the output string. A call to this routine was added to the tester class run routine after the program model debug text function is called to output the program code. The expected results for encoder test #1 and #2 were updated for the additional dictionary debug output.
[commit 11337cb673]
Friday, October 25, 2013
Program – Dereference Removed Lines
When a line of code is replaced or removed, the use counts of any dictionary entries referenced on the line need to be decremented. If the use counts becomes zero, the entry is no longer being used and needs to be deleted from the dictionary (the entry becomes available for use by another item upon the next add).
The dereference routine was added to the program model to scan a line that is about to be replaced or removed. This routine loops through each program word of the line and removes the reference for any code that has an operand, which is determined by whether the code has a remove function. In the update line routine, this routine is called before the line is replaced or removed.
Table entry remove functions were added for the various REM, constant and variable codes. Each remove function calls the remove routine of appropriate dictionary (just like the encode function calls the add routine of appropriate dictionary to add a reference).
Encoder test #2 contains replace and remove operations, but previously the use counts of dictionary entries were not being decremented. Now that they are, several dictionary entries are now removed since their uses counts become zero and are removed from the dictionary. This allowed new items to be added in the unused entries, which affected the index of several dictionary entries on some of the program lines, therefore the expected results were updated.
[commit a310dc458e]
The dereference routine was added to the program model to scan a line that is about to be replaced or removed. This routine loops through each program word of the line and removes the reference for any code that has an operand, which is determined by whether the code has a remove function. In the update line routine, this routine is called before the line is replaced or removed.
Table entry remove functions were added for the various REM, constant and variable codes. Each remove function calls the remove routine of appropriate dictionary (just like the encode function calls the add routine of appropriate dictionary to add a reference).
Encoder test #2 contains replace and remove operations, but previously the use counts of dictionary entries were not being decremented. Now that they are, several dictionary entries are now removed since their uses counts become zero and are removed from the dictionary. This allowed new items to be added in the unused entries, which affected the index of several dictionary entries on some of the program lines, therefore the expected results were updated.
[commit a310dc458e]
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