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https://github.com/Gericom/teak-llvm.git
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40624a085c
Summary:
This patch adds support of expression evaluation in a context of some object.
Consider the following example:
```
struct S {
int a = 11;
int b = 12;
};
int main() {
S s;
int a = 1;
int b = 2;
// We have stopped here
return 0;
}
```
This patch allows to do something like that:
```
lldb.frame.FindVariable("s").EvaluateExpression("a + b")
```
and the result will be `33` (not `3`) because fields `a` and `b` of `s` will be
used (not locals `a` and `b`).
This is achieved by replacing of `this` type and object for the expression. This
has some limitations: an expression can be evaluated only for values located in
the debuggee process memory (they must have an address of `eAddressTypeLoad`
type).
Reviewers: teemperor, clayborg, jingham, zturner, labath, davide, spyffe, serge-sans-paille
Reviewed By: jingham
Subscribers: abidh, lldb-commits, leonid.mashinskiy
Tags: #lldb
Differential Revision: https://reviews.llvm.org/D55318
llvm-svn: 353149
146 lines
4.7 KiB
Python
146 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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mydir = TestBase.compute_mydir(__file__)
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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
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#
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obj_val = frame.FindVariable("cpp_struct")
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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.assertTrue(value.GetError().Success())
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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.assertTrue(value.GetError().Success())
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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.assertTrue(value.GetError().Success())
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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.assertTrue(value.GetError().Success())
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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.assertFalse(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.assertFalse(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.assertTrue(value.GetError().Success())
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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.assertFalse(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.assertTrue(value.GetError().Success())
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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.assertFalse(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.assertTrue(value.GetError().Success())
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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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