Add test and fix for long log line #219

cocotb_test/simulator.py

@@ -292,7 +292,12 @@ def get_abs_paths(self, paths):
 
     async def _log_pipe(self, level, stream):
         while not stream.at_eof():
-            line = await stream.readline()
+            try:
+                line = await stream.readline()
+            except ValueError:
+                warnings.warn("Logging limit is reached. Log file will be truncated.", RuntimeWarning, stacklevel=2)
+                continue
+
             if line:
                 self.logger.log(level, line.decode("utf-8").rstrip())
 

tests/test_long_log.py

@@ -0,0 +1,23 @@
+import cocotb
+from cocotb.triggers import Timer
+
+import pytest
+from cocotb_test.simulator import run
+import os
+
+hdl_dir = os.path.dirname(__file__)
+
+
+@cocotb.test()
+def run_test_long_log(dut):
+
+    yield Timer(1)
+
+    dut._log.info("BEFORE")
+    dut._log.info("LONGLOG" * 100000)
+    dut._log.info("AFTER")
+
+
+@pytest.mark.skipif(os.getenv("SIM") == "ghdl", reason="VHDL not suported")
+def test_long_log():
+    run(verilog_sources=[os.path.join(hdl_dir, "dff.sv")], module="test_long_log", toplevel="dff_test")