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[lldb] Fix updating persistent variables without JIT #149642

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Merged
merged 1 commit into from
Jul 30, 2025
Merged

[lldb] Fix updating persistent variables without JIT #149642

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21 changes: 11 additions & 10 deletions lldb/source/Expression/Materializer.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -102,22 +102,23 @@ class EntityPersistentVariable : public Materializer::Entity {
m_persistent_variable_sp->GetName(), mem, eAddressTypeLoad,
map.GetAddressByteSize());

if (m_persistent_variable_sp->m_flags &
ExpressionVariable::EVKeepInTarget) {
if (used_policy == IRMemoryMap::eAllocationPolicyMirror) {
if (used_policy == IRMemoryMap::eAllocationPolicyMirror) {
if (m_persistent_variable_sp->m_flags &
ExpressionVariable::EVKeepInTarget) {
// Clear the flag if the variable will never be deallocated.
Status leak_error;
map.Leak(mem, leak_error);
m_persistent_variable_sp->m_flags &=
~ExpressionVariable::EVNeedsAllocation;
} else {
// If the variable cannot be kept in target, clear this flag...
m_persistent_variable_sp->m_flags &=
~ExpressionVariable::EVKeepInTarget;
// ...and set the flag to copy the value during dematerialization.
m_persistent_variable_sp->m_flags |=
ExpressionVariable::EVNeedsFreezeDry;
}
} else {
// If we cannot allocate memory in the process,
// - clear the 'EVKeepInTarget' flag to ensure that 'm_live_sp' is reset
// during dematerialization,
m_persistent_variable_sp->m_flags &= ~ExpressionVariable::EVKeepInTarget;
// - set the 'EVNeedsFreezeDry' flag so that the value is copied to
// 'm_frozen_sp' during dematerialization.
m_persistent_variable_sp->m_flags |= ExpressionVariable::EVNeedsFreezeDry;
}

// Write the contents of the variable to the area.
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4 changes: 4 additions & 0 deletions lldb/test/API/functionalities/postmortem/elf-core/expr/TestExpr.py
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Expand Up @@ -37,6 +37,10 @@ def test_persist_var(self):
self.target.EvaluateExpression("int $my_int = 5")
self.expect_expr("$my_int * 2", result_type="int", result_value="10")

# Try assigning the persistent variable a new value.
self.target.EvaluateExpression("$my_int = 55")
self.expect_expr("$my_int", result_type="int", result_value="55")

def test_context_object(self):
"""Test expression evaluation in context of an object."""

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