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
79 lines
2.7 KiB
Python
79 lines
2.7 KiB
Python
"""
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Tests expression evaluation in context of an objc class.
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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.decorators import *
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from lldbsuite.test.lldbtest import *
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class ContextObjectObjcTestCase(TestBase):
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mydir = TestBase.compute_mydir(__file__)
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@skipUnlessDarwin
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def test_context_object_objc(self):
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"""Tests expression evaluation in context of an objc class."""
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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 objc class variable
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#
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obj_val = frame.FindVariable("objcClass")
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self.assertTrue(obj_val.IsValid())
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obj_val = obj_val.Dereference()
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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 retrieving 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 if the self pointer is properly evaluated
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# Test retrieving of an objcClass's property through the self pointer
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value = obj_val.EvaluateExpression("self.property")
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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 objcClass's methods evaluation through the self pointer
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value = obj_val.EvaluateExpression("[self method]")
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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(), 3333)
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# Test if we can use a computation result reference object correctly
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obj_val = frame.EvaluateExpression("[ObjcClass createNew]")
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self.assertTrue(obj_val.IsValid())
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obj_val = obj_val.Dereference()
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self.assertTrue(obj_val.IsValid())
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# Test an expression evaluation on it
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value = obj_val.EvaluateExpression("1")
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self.assertTrue(value.IsValid())
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self.assertTrue(value.GetError().Success())
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# Test retrieving of a field on it
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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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def setUp(self):
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TestBase.setUp(self)
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self.main_source = "main.m"
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self.main_source_spec = lldb.SBFileSpec(self.main_source)
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