dd5c5f72e0
When UserExpression::Evaluate() fails and doesn't return a ValueObject there is no vehicle for returning the error in the return value.
This behavior can be observed by applying the following patch:
diff --git a/lldb/source/Target/Target.cpp b/lldb/source/Target/Target.cpp
index f1a311b7252c..58c03ccdb068 100644
--- a/lldb/source/Target/Target.cpp
+++ b/lldb/source/Target/Target.cpp
@@ -2370,6 +2370,7 @@ UserExpression *Target::GetUserExpressionForLanguage(
Expression::ResultType desired_type,
const EvaluateExpressionOptions &options, ValueObject *ctx_obj,
Status &error) {
+ error.SetErrorStringWithFormat("Ha ha!"); return nullptr;
auto type_system_or_err = GetScratchTypeSystemForLanguage(language);
if (auto err = type_system_or_err.takeError()) {
error.SetErrorStringWithFormat(
and then running
$ lldb -o "p 1"
(lldb) p 1
(lldb)
This patch fixes this by creating an empty result ValueObject that wraps the error.
Differential Revision: https://reviews.llvm.org/D135998
144 lines
4.7 KiB
Python
144 lines
4.7 KiB
Python
"""
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Tests expression evaluation in context of an object.
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"""
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import lldb
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import lldbsuite.test.lldbutil as lldbutil
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from lldbsuite.test.lldbtest import *
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class ContextObjectTestCase(TestBase):
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def test_context_object(self):
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"""Tests expression evaluation in context of an object."""
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self.build()
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(target, process, thread, bkpt) = lldbutil.run_to_source_breakpoint(self, '// Break here', self.main_source_spec)
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frame = thread.GetFrameAtIndex(0)
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#
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# Test C++ struct variable and reference-to-struct variable
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#
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for obj in "cpp_struct", "cpp_struct_ref":
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obj_val = frame.FindVariable(obj)
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self.assertTrue(obj_val.IsValid())
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# Test an empty expression evaluation
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value = obj_val.EvaluateExpression("")
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self.assertFalse(value.IsValid())
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self.assertFalse(value.GetError().Success())
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# Test retrieveing of a field (not a local with the same name)
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value = obj_val.EvaluateExpression("field")
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self.assertTrue(value.IsValid())
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self.assertSuccess(value.GetError())
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self.assertEqual(value.GetValueAsSigned(), 1111)
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# Test functions evaluation
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value = obj_val.EvaluateExpression("function()")
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self.assertTrue(value.IsValid())
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self.assertSuccess(value.GetError())
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self.assertEqual(value.GetValueAsSigned(), 2222)
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# Test that we retrieve the right global
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value = obj_val.EvaluateExpression("global.field")
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self.assertTrue(value.IsValid())
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self.assertSuccess(value.GetError())
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self.assertEqual(value.GetValueAsSigned(), 1111)
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#
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# Test C++ union variable
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#
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obj_val = frame.FindVariable("cpp_union")
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self.assertTrue(obj_val.IsValid())
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# Test retrieveing of a field
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value = obj_val.EvaluateExpression("field_int")
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self.assertTrue(value.IsValid())
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self.assertSuccess(value.GetError())
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self.assertEqual(value.GetValueAsSigned(), 5555)
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#
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# Test C++ scalar
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#
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obj_val = frame.FindVariable("cpp_scalar")
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self.assertTrue(obj_val.IsValid())
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# Test an expression evaluation
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value = obj_val.EvaluateExpression("1")
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self.assertTrue(value.IsValid())
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self.assertFalse(value.GetError().Success())
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#
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# Test C++ array
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#
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obj_val = frame.FindVariable("cpp_array")
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self.assertTrue(obj_val.IsValid())
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# Test an expression evaluation
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value = obj_val.EvaluateExpression("1")
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self.assertTrue(value.IsValid())
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self.assertFalse(value.GetError().Success())
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# Test retrieveing of an element's field
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value = obj_val.GetValueForExpressionPath("[7]").EvaluateExpression("field")
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self.assertTrue(value.IsValid())
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self.assertSuccess(value.GetError())
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self.assertEqual(value.GetValueAsSigned(), 1111)
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#
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# Test C++ pointer
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#
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obj_val = frame.FindVariable("cpp_pointer")
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self.assertTrue(obj_val.IsValid())
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# Test an expression evaluation
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value = obj_val.EvaluateExpression("1")
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self.assertTrue(value.IsValid())
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self.assertFalse(value.GetError().Success())
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# Test retrieveing of a dereferenced object's field
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value = obj_val.Dereference().EvaluateExpression("field")
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self.assertTrue(value.IsValid())
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self.assertSuccess(value.GetError())
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self.assertEqual(value.GetValueAsSigned(), 1111)
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#
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# Test C++ computation result
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#
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obj_val = frame.EvaluateExpression("cpp_namespace::GetCppStruct()")
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self.assertTrue(obj_val.IsValid())
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# Test an expression evaluation
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value = obj_val.EvaluateExpression("1")
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self.assertTrue(value.IsValid())
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self.assertFalse(value.GetError().Success())
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#
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# Test C++ computation result located in debuggee memory
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#
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obj_val = frame.EvaluateExpression("cpp_namespace::GetCppStructPtr()")
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self.assertTrue(obj_val.IsValid())
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# Test an expression evaluation
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value = obj_val.EvaluateExpression("1")
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self.assertTrue(value.IsValid())
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self.assertFalse(value.GetError().Success())
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# Test retrieveing of a dereferenced object's field
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value = obj_val.Dereference().EvaluateExpression("field")
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self.assertTrue(value.IsValid())
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self.assertSuccess(value.GetError())
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self.assertEqual(value.GetValueAsSigned(), 1111)
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def setUp(self):
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TestBase.setUp(self)
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self.main_source = "main.cpp"
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self.main_source_spec = lldb.SBFileSpec(self.main_source)
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