lldb/test/API/commands/expression/persistent_result/TestPersistentResult.py

   1 """
   2 Test controlling `expression` result variables are persistent.
   3 """
   4
   5 import lldb
   6 from lldbsuite.test.lldbtest import *
   7 from lldbsuite.test.decorators import *
   8 from lldbsuite.test import lldbutil
   9
  10
  11 class TestCase(TestBase):
  12     def setUp(self):
  13         TestBase.setUp(self)
  14         self.build()
  15         lldbutil.run_to_source_breakpoint(self, "break here", lldb.SBFileSpec("main.c"))
  16
  17     def test_enable_persistent_result(self):
  18         """Test explicitly enabling result variables persistence."""
  19         self.expect("expression --persistent-result on -- i", substrs=["(int) $0 = 30"])
  20         # Verify the lifetime of $0 extends beyond the `expression` it was created in.
  21         self.expect("expression $0", substrs=["(int) $0 = 30"])
  22
  23     def test_disable_persistent_result(self):
  24         """Test explicitly disabling persistent result variables."""
  25         self.expect("expression --persistent-result off -- i", substrs=["(int) 30"])
  26         # Verify a persistent result was not silently created.
  27         self.expect("expression $0", error=True)
  28
  29     def test_expression_persists_result(self):
  30         """Test `expression`'s default behavior is to persist a result variable."""
  31         self.expect("expression i", substrs=["(int) $0 = 30"])
  32         self.expect("expression $0", substrs=["(int) $0 = 30"])
  33
  34     def test_p_does_not_persist_results(self):
  35         """Test `p` does not persist a result variable."""
  36         self.expect("p i", startstr="(int) 30")
  37         self.expect("p $0", error=True)