TOPS-20 PASCAL Language Manual - Bitsavers

PASDDT: THE PASCAL-20 DEBUGGER
The following rules apply to the use of BREAK:
If you specify a break identifier, but not a line number, the
following happens:
• If there is already a breakpoint with this identifier, this
breakpoin~ is used.
• If there is no breakpoint with this identifier, an error
occurs.
If you specify a line number, but not a break identifier, the
following happens:
• If a breakpoint is assigned for this
breakpoint is used.
location,
that
• If a breakpoint has not been assigned, a new breakpoint is
established with the identifier NO NAME.
If the command specifies both a line number and a break identifier,
the following happens:
• If a breakpoint has already been assigned for this location
with this identifier, the previously defined breakpoint is
used.
• If a breakpoint has already been assigned for this location
with a different identifier, an error occurs.
• If a breakpoint has already been assigned at another location
with this identifier, and no breakpoint has been set at this
location, PASDDT prints a warning message. PASDDT then asks
if you want to override the address associated with that
breakpoint. If so, the previous breakpoint is discarded, and
a new breakpoint is declared with the given identifier and
location.
Note that you must use the PROCEED command after each break for the
program to continue. PROCEED is described in Section 9.4.7.
Note the following example:
PASDDT)break 10 first
PASDDT)displa~ break
BREAK POINT(S):
Name = FIRST
Break Address 000000400044
Line Number
10
Status
BREAK
PASDDT)proceed
»BREAK:FIRST
PC AT VIRTUAL ADDRESS 00000040044
PASCAL LINE NUMBER 10
LINE 9:
LINE 10:
Count:= O~
WRITELN ('Enter ~our scores. When done, t~pe CTRL/Z.');
LINE 11:
PASDDT)
WHILE NOT EOF DO
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