werat created this revision.
werat added a reviewer: teemperor.
werat requested review of this revision.
Herald added a project: LLDB.
Herald added a subscriber: lldb-commits.
Right now `SBValue::Persist()` works properly only for values that refere to
variables (refer to unit-tests for an example). Constant values (e.g. values
created by `EvaluateExpression` or `CreateValueFromData`) can be persisted, but
using them in the expressions leads to an error:
>>> v = lldb.frame.EvaluateExpression("1+2")
>>> vp = v.Persist()
>>> vp.GetName()
'$1'
>>> v = lldb.frame.EvaluateExpression("$1")
>>> v.GetValue()
'3'
>>> v = lldb.frame.EvaluateExpression("$1+1")
>>> v.GetError().GetCString()
"error: supposed to interpret, but failed: Interpreter couldn't read from
memory\n"
In this patch we mark constant values as "required materialization" and fix up
the dematerialization logic to apply side-effects.
Also move Windows-failing use cases to a separate test, so that other tests can
be executed on Windows too.
Repository:
rG LLVM Github Monorepo
https://reviews.llvm.org/D98370
Files:
lldb/source/Core/ValueObject.cpp
lldb/source/Expression/Materializer.cpp
lldb/test/API/python_api/sbvalue_persist/TestSBValuePersist.py
lldb/test/API/python_api/sbvalue_persist/main.cpp
Index: lldb/test/API/python_api/sbvalue_persist/main.cpp
===================================================================
--- lldb/test/API/python_api/sbvalue_persist/main.cpp
+++ lldb/test/API/python_api/sbvalue_persist/main.cpp
@@ -1,14 +1,21 @@
-#include <vector>
#include <string>
+#include <vector>
void f() {}
+struct P {
+ int x;
+ float y;
+} _p;
+
int main() {
- int foo = 10;
- int *bar = new int(4);
- std::string baz = "85";
-
- f(); // break here
- f(); // break here
- return 0;
+ int foo = 10;
+ int *bar = new int(4);
+ std::string baz = "85";
+
+ int mem[] = {1, 0x3fc00000}; // P { x = 1, y = 1.5 }
+
+ f(); // break here
+ f(); // break here
+ return 0;
}
Index: lldb/test/API/python_api/sbvalue_persist/TestSBValuePersist.py
===================================================================
--- lldb/test/API/python_api/sbvalue_persist/TestSBValuePersist.py
+++ lldb/test/API/python_api/sbvalue_persist/TestSBValuePersist.py
@@ -1,7 +1,5 @@
"""Test SBValue::Persist"""
-
-
import lldb
from lldbsuite.test.decorators import *
from lldbsuite.test.lldbtest import *
@@ -13,9 +11,7 @@
mydir = TestBase.compute_mydir(__file__)
NO_DEBUG_INFO_TESTCASE = True
- @expectedFailureAll(oslist=["windows"], bugnumber="llvm.org/pr24772")
- def test(self):
- """Test SBValue::Persist"""
+ def _setup(self):
self.build()
self.setTearDownCleanup()
self.runCmd("file " + self.getBuildArtifact("a.out"), CURRENT_EXECUTABLE_SET)
@@ -40,42 +36,103 @@
# Execute the cleanup function during test case tear down.
self.addTearDownHook(cleanup)
+ @add_test_categories(['pyapi'])
+ @expectedFailureAll(oslist=["windows"], bugnumber="llvm.org/pr24772")
+ def test_std_string(self):
+ """Test SBValue::Persist for a variable of type std::string"""
+ self._setup()
+
+ baz = self.frame().FindVariable("baz")
+ self.assertTrue(baz.IsValid(), "baz is not valid")
+
+ bazPersist = baz.Persist()
+ self.assertTrue(bazPersist.IsValid(), "bazPersist is not valid")
+ self.assertEqual(bazPersist.GetSummary(), '"85"')
+
+ self.runCmd("continue")
+
+ self.assertTrue(bazPersist.IsValid(), "bazPersist is not valid")
+ self.assertEqual(bazPersist.GetSummary(), '"85"')
+
+ @add_test_categories(['pyapi'])
+ def test(self):
+ """Test SBValue::Persist"""
+ self._setup()
+
foo = self.frame().FindVariable("foo")
bar = self.frame().FindVariable("bar")
- baz = self.frame().FindVariable("baz")
self.assertTrue(foo.IsValid(), "foo is not valid")
self.assertTrue(bar.IsValid(), "bar is not valid")
- self.assertTrue(baz.IsValid(), "baz is not valid")
fooPersist = foo.Persist()
barPersist = bar.Persist()
- bazPersist = baz.Persist()
self.assertTrue(fooPersist.IsValid(), "fooPersist is not valid")
self.assertTrue(barPersist.IsValid(), "barPersist is not valid")
- self.assertTrue(bazPersist.IsValid(), "bazPersist is not valid")
- self.assertEqual(
- fooPersist.GetValueAsUnsigned(0), 10,
- "fooPersist != 10")
- self.assertEqual(
- barPersist.GetPointeeData().sint32[0], 4,
- "barPersist != 4")
- self.assertEquals(bazPersist.GetSummary(), '"85"', "bazPersist != 85")
+ self.assertEqual(fooPersist.GetValueAsUnsigned(0), 10)
+ self.assertEqual(barPersist.GetPointeeData().sint32[0], 4)
self.runCmd("continue")
self.assertTrue(fooPersist.IsValid(), "fooPersist is not valid")
self.assertTrue(barPersist.IsValid(), "barPersist is not valid")
- self.assertTrue(bazPersist.IsValid(), "bazPersist is not valid")
- self.assertEqual(
- fooPersist.GetValueAsUnsigned(0), 10,
- "fooPersist != 10")
- self.assertEqual(
- barPersist.GetPointeeData().sint32[0], 4,
- "barPersist != 4")
- self.assertEquals(bazPersist.GetSummary(), '"85"', "bazPersist != 85")
+ self.assertEqual(fooPersist.GetValueAsUnsigned(0), 10)
+ self.assertEqual(barPersist.GetPointeeData().sint32[0], 4)
self.expect("expr *(%s)" % (barPersist.GetName()), substrs=['= 4'])
+
+ @add_test_categories(['pyapi'])
+ def test_ephemeral(self):
+ self._setup()
+
+ # Test persisting values created from data, i.e. not pointing to any
+ # location in the process memory.
+ var = self.frame().EvaluateExpression("1+1")
+ varPersist = var.Persist()
+ self.assertTrue(varPersist.IsValid(), "varPersist is not valid")
+ self.assertEqual(varPersist.value, "2")
+ # Shortcut for variable name.
+ p = varPersist.name
+
+ val = self.frame().EvaluateExpression("{}".format(p))
+ self.assertEqual(val.value, "2")
+
+ val = self.frame().EvaluateExpression("++{}".format(p))
+ self.assertEqual(val.value, "3")
+
+ val = self.frame().EvaluateExpression("{}++ + {}".format(p, p))
+ self.assertEqual(val.value, "7")
+
+ val = self.frame().EvaluateExpression("{}".format(p))
+ self.assertEqual(val.value, "4")
+
+ val = self.frame().EvaluateExpression("{} + 1".format(p))
+ self.assertEqual(val.value, "5")
+
+ @add_test_categories(['pyapi'])
+ def test_cast_struct(self):
+ self._setup()
+
+ var = self.frame().EvaluateExpression("(P&)mem")
+ varPersist = var.Persist()
+ self.assertTrue(varPersist.IsValid(), "varPersist is not valid")
+ # Shortcut for variable name.
+ p = varPersist.name
+
+ val = self.frame().EvaluateExpression("{}.x".format(p))
+ self.assertEqual(val.value, "1")
+
+ val = self.frame().EvaluateExpression("{}.y".format(p))
+ self.assertEqual(val.value, "1.5")
+
+ val = self.frame().EvaluateExpression("++{}.y".format(p))
+ self.assertEqual(val.value, "2.5")
+
+ val = self.frame().EvaluateExpression("{}.y".format(p))
+ self.assertEqual(val.value, "2.5")
+
+ val = self.frame().EvaluateExpression("mem[1]".format(p))
+ self.assertEqual(val.value, "1069547520") # 0x3fc00000
Index: lldb/source/Expression/Materializer.cpp
===================================================================
--- lldb/source/Expression/Materializer.cpp
+++ lldb/source/Expression/Materializer.cpp
@@ -284,13 +284,11 @@
.getValueOr(0));
// Read the contents of the spare memory area
-
- m_persistent_variable_sp->ValueUpdated();
+ auto byte_size = m_persistent_variable_sp->GetByteSize().getValueOr(0);
+ auto buffer = std::make_shared<DataBufferHeap>(byte_size, 0);
Status read_error;
-
- map.ReadMemory(m_persistent_variable_sp->GetValueBytes(), mem,
- m_persistent_variable_sp->GetByteSize().getValueOr(0), read_error);
+ map.ReadMemory(buffer->GetBytes(), mem, byte_size, read_error);
if (!read_error.Success()) {
err.SetErrorStringWithFormat(
@@ -300,8 +298,12 @@
return;
}
- m_persistent_variable_sp->m_flags &=
- ~ExpressionVariable::EVNeedsFreezeDry;
+ m_persistent_variable_sp->m_frozen_sp = ValueObjectConstResult::Create(
+ map.GetBestExecutionContextScope(),
+ m_persistent_variable_sp->GetCompilerType(),
+ m_persistent_variable_sp->GetName(),
+ DataExtractor(buffer, map.GetByteOrder(), map.GetAddressByteSize()),
+ LLDB_INVALID_ADDRESS);
}
} else {
err.SetErrorStringWithFormat(
Index: lldb/source/Core/ValueObject.cpp
===================================================================
--- lldb/source/Core/ValueObject.cpp
+++ lldb/source/Core/ValueObject.cpp
@@ -3131,7 +3131,15 @@
ExpressionVariableSP persistent_var_sp =
persistent_state->CreatePersistentVariable(const_result_sp);
persistent_var_sp->m_live_sp = persistent_var_sp->m_frozen_sp;
- persistent_var_sp->m_flags |= ExpressionVariable::EVIsProgramReference;
+
+ // ConstResult values don't refer to a location in memory of the target
+ // process, so they need to be allocated explicitly.
+ if (GetValueType() == lldb::eValueTypeConstResult) {
+ persistent_var_sp->m_flags |= ExpressionVariable::EVNeedsAllocation;
+ persistent_var_sp->m_flags |= ExpressionVariable::EVNeedsFreezeDry;
+ } else {
+ persistent_var_sp->m_flags |= ExpressionVariable::EVIsProgramReference;
+ }
return persistent_var_sp->GetValueObject();
}
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