lldb/test/API/commands/expression/persistent_variables/TestPersistentVariables.py

   1 """
   2 Test that lldb persistent variables works correctly.
   3 """
   4
   5
   6 import lldb
   7 from lldbsuite.test.lldbtest import *
   8
   9
  10 class PersistentVariablesTestCase(TestBase):
  11     def test_persistent_variables(self):
  12         """Test that lldb persistent variables works correctly."""
  13         self.build()
  14         lldbutil.run_to_source_breakpoint(
  15             self, "// break here", lldb.SBFileSpec("main.c")
  16         )
  17
  18         self.runCmd("expr int $i = i")
  19         self.expect_expr("$i == i", result_type="bool", result_value="true")
  20         self.expect_expr("$i + 1", result_type="int", result_value="6")
  21         self.expect_expr("$i + 3", result_type="int", result_value="8")
  22         self.expect_expr("$1 + $2", result_type="int", result_value="14")
  23         self.expect_expr("$3", result_type="int", result_value="14")
  24         self.expect_expr("$2", result_type="int", result_value="8")
  25         self.expect_expr("(int)-2", result_type="int", result_value="-2")
  26         self.expect_expr("$4", result_type="int", result_value="-2")
  27         self.expect_expr("$4 > (int)31", result_type="bool", result_value="false")
  28         self.expect_expr("(long)$4", result_type="long", result_value="-2")
  29
  30         # Try assigning an existing persistent veriable with a numeric name.
  31         self.expect(
  32             "expr int $2 = 1234",
  33             error=True,
  34             substrs=[
  35                 "Error [IRForTarget]: Names starting with $0, $1, ... are reserved for use as result names"
  36             ],
  37         )
  38         # $2 should still have its original value.
  39         self.expect_expr("$2", result_type="int", result_value="8")
  40
  41         # Try assigning an non-existing persistent veriable with a numeric name.
  42         self.expect(
  43             "expr int $200 = 3",
  44             error=True,
  45             substrs=[
  46                 "Error [IRForTarget]: Names starting with $0, $1, ... are reserved for use as result names"
  47             ],
  48         )
  49         # Test that $200 wasn't created by the previous expression.
  50         self.expect(
  51             "expr $200", error=True, substrs=["use of undeclared identifier '$200'"]
  52         )
  53
  54         # Try redeclaring the persistent variable with the same type.
  55         # This should be rejected as we treat them as if they are globals.
  56         self.expect(
  57             "expr int $i = 123",
  58             error=True,
  59             substrs=["redefinition of persistent variable '$i'"],
  60         )
  61         self.expect_expr("$i", result_type="int", result_value="5")
  62
  63         # Try redeclaring the persistent variable with another type. Should
  64         # also be rejected.
  65         self.expect(
  66             "expr long $i = 123",
  67             error=True,
  68             substrs=["redefinition of persistent variable '$i'"],
  69         )
  70         self.expect_expr("$i", result_type="int", result_value="5")
  71
  72         # Try assigning the persistent variable a new value.
  73         self.expect("expr $i = 55")
  74         self.expect_expr("$i", result_type="int", result_value="55")