[BUG]: Avoid nullptr access and subsequent deref

[haochengxia]

In Analyzer, we will output op str, the nullptr will cause an error when deref

15 valid str + 242 invalid str

[Copilot]

Pull Request Overview

This PR addresses a bug related to null pointer access when dereferencing operation strings in the Analyzer. The fix expands the req_op_str array to properly handle all possible values of the req_op_e enum, preventing potential segmentation faults when accessing invalid operation indices.

Key changes:

• Expands the req_op_str array from 16 elements to 257 elements to match the full range of req_op_e enum values
• Introduces macro definitions to efficiently populate the array with "invalid" strings for undefined operations

[haochengxia]

For this issue, we can either change the value of OP_INVALID or fill the middle value. If we do not want to change enum.h, then we may need to change op.h (

libCacheSim/libCacheSim/traceAnalyzer/op.h

Line 39 in 9ba8009

for (int i = 0; i < OP_INVALID + 1; i++) {

).

[1a1a11a]

LGTM