xref: /llvm-project/lldb/test/API/commands/expression/persistent_variables/TestPersistentVariables.py (revision d33fa70dddcb29d5fd85188e119f034e585ccccf) 
1"""
2Test that lldb persistent variables works correctly.
3"""
4
5
6import lldb
7from lldbsuite.test.lldbtest import *
8
9
10class 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")
75