Debug non-terminal symbol for parser error handling
A device has an input port to allow the device to receive data. The device also has a parser to parse the data in response to symbols in a parser stack, determine when a symbol is a debug non-terminal symbol, and notify the device via an interrupt. The interrupt causes the device to gather information about the state of the parser at the time of encountering the non-terminal symbol.
1 . A device, comprising:
at least one input port to allow the processor to receive data;
a parser to:
parse the data in response to symbols in a parser stack;
determine when a symbol is a debug non-terminal symbol; and
notify the device of an interrupt.
2 . The device of claim 1 , the device further comprising an array of semantic processing units.
3 . The device of claim 2 , the device further comprising a dispatcher to receive the notification of the interrupt and to dispatch the interrupt to one of the array of semantic processing units to handle the interrupt.
4 . The device of claim 3 , the semantic processing unit further to gather data related to the interrupt and store it.
5 . The device of claim 4 , the semantic processing unit to gather data further comprising a semantic processing unit to determine at least one of the group consisting of: the last data, a packet identifier from which the data was accessed, a last state in the parser finite state machine, and last contents of the parser stack.
6 . The device of claim 1 , the device further comprising an output port to allow the device to communicate the interrupt externally.
7 . The device of claim 6 , the output port further comprising an output port to a controller.
8 . The device of claim 6 , the output further comprising an output port to a network.
9 . A method of processing data, comprising:
accessing a predetermined amount of data by a device having a parser;
determine if there is a match for the predetermined amount of data in a parser stack;
if there is no match, placing the device in a debug state; and
gathering information as to the status of the device at the time the predetermined amount of data was accessed.
10 . The method of claim 9 , the method further comprising triggering a message having the information as to the status of the device to a controller.
11 . The method of claim 10 , triggering a message further comprising triggering an error message to a user.
12 . The method of claim 10 , triggering a message further comprising triggering an error message to be written and stored.
13 . The method of claim 10 , triggering a message further comprising triggering a message to be sent externally from a customer site.
14 . The method of claim 9 , determining if there is a match for the predetermined amount of data further comprising determining that the symbol is a non-terminal symbol.
15 . The method of claim 9 , determining if there is a match for the predetermined amount of data further comprising looking up the predetermined amount of data in a table.
16 . The method of claim 9 , placing the device in a debug state further comprising:
generating an interrupt;
transmitting the interrupt to a dispatcher; and
assigning a semantic processing unit to handle the interrupt.
17 . The method of claim 9 , gathering information as to the status of the device at the time the predetermined data was accessed further comprising recording at least one of the group consisting of: last data, a last state of the parser finite state machine, a packet identifier from which the data was accessed, and last contents of the parser stack.