xref: /llvm-project/lldb/test/API/commands/expression/persistent_variables/TestPersistentVariables.py (revision 4cc8f2a017c76af25234afc7c380550e9c93135c) 
1"""
2Test that lldb persistent variables works correctly.
3"""
4
5
6
7import lldb
8from lldbsuite.test.lldbtest import *
9
10
11class PersistentVariablesTestCase(TestBase):
12
13    def test_persistent_variables(self):
14        """Test that lldb persistent variables works correctly."""
15        self.build()
16        lldbutil.run_to_source_breakpoint(self, "// break here", lldb.SBFileSpec("main.c"))
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("expr int $2 = 1234", error=True,
32            substrs=["Error [IRForTarget]: Names starting with $0, $1, ... are reserved for use as result names"])
33        # $2 should still have its original value.
34        self.expect_expr("$2", result_type="int", result_value="8")
35
36        # Try assigning an non-existing persistent veriable with a numeric name.
37        self.expect("expr int $200 = 3", error=True,
38            substrs=["Error [IRForTarget]: Names starting with $0, $1, ... are reserved for use as result names"])
39        # Test that $200 wasn't created by the previous expression.
40        self.expect("expr $200", error=True,
41            substrs=["use of undeclared identifier '$200'"])
42
43        # Try redeclaring the persistent variable with the same type.
44        # This should be rejected as we treat them as if they are globals.
45        self.expect("expr int $i = 123", error=True,
46                    substrs=["error: redefinition of persistent variable '$i'"])
47        self.expect_expr("$i", result_type="int", result_value="5")
48
49        # Try redeclaring the persistent variable with another type. Should
50        # also be rejected.
51        self.expect("expr long $i = 123", error=True,
52                    substrs=["error: redefinition of persistent variable '$i'"])
53        self.expect_expr("$i", result_type="int", result_value="5")
54
55        # Try assigning the persistent variable a new value.
56        self.expect("expr $i = 55")
57        self.expect_expr("$i", result_type="int", result_value="55")
58