[Lldb-commits] [PATCH] D155198: [lldb] Consider OP_addrx in DWARFExpression::Update_DW_OP_addr

[Felipe de Azevedo Piovezan via Phabricator via lldb-commits]

fdeazeve updated this revision to Diff 540001.
fdeazeve added a comment.

Minor comment improvements


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D155198/new/

https://reviews.llvm.org/D155198

Files:
  lldb/source/Expression/DWARFExpression.cpp
  lldb/unittests/Expression/DWARFExpressionTest.cpp


Index: lldb/unittests/Expression/DWARFExpressionTest.cpp
===================================================================
--- lldb/unittests/Expression/DWARFExpressionTest.cpp
+++ lldb/unittests/Expression/DWARFExpressionTest.cpp
@@ -522,6 +522,11 @@
   ASSERT_TRUE(evaluate(expr, status, result)) << status.ToError();
   ASSERT_EQ(result.GetValueType(), Value::ValueType::LoadAddress);
   ASSERT_EQ(result.GetScalar().UInt(), 0x5678u);
+
+  ASSERT_TRUE(expr.Update_DW_OP_addr(dwarf_cu, 0xdeadbeef));
+  ASSERT_TRUE(evaluate(expr, status, result)) << status.ToError();
+  ASSERT_EQ(result.GetValueType(), Value::ValueType::LoadAddress);
+  ASSERT_EQ(result.GetScalar().UInt(), 0xdeadbeefu);
 }
 
 class CustomSymbolFileDWARF : public SymbolFileDWARF {
Index: lldb/source/Expression/DWARFExpression.cpp
===================================================================
--- lldb/source/Expression/DWARFExpression.cpp
+++ lldb/source/Expression/DWARFExpression.cpp
@@ -408,13 +408,33 @@
       // the heap data so "m_data" will now correctly manage the heap data.
       m_data.SetData(encoder.GetDataBuffer());
       return true;
-    } else {
-      const offset_t op_arg_size =
-          GetOpcodeDataSize(m_data, offset, op, dwarf_cu);
-      if (op_arg_size == LLDB_INVALID_OFFSET)
-        break;
-      offset += op_arg_size;
     }
+    if (op == DW_OP_addrx) {
+      // Replace DW_OP_addrx with DW_OP_addr, since we can't modify the
+      // read-only debug_addr table.
+      // Subtract one to account for the opcode.
+      llvm::ArrayRef data_before_op = m_data.GetData().take_front(offset - 1);
+
+      // Read the addrx index to determine how many bytes it needs.
+      const lldb::offset_t old_offset = offset;
+      m_data.GetULEB128(&offset);
+      if (old_offset == offset)
+        return false;
+      llvm::ArrayRef data_after_op = m_data.GetData().drop_front(offset);
+
+      DataEncoder encoder(m_data.GetByteOrder(), m_data.GetAddressByteSize());
+      encoder.AppendData(data_before_op);
+      encoder.AppendU8(DW_OP_addr);
+      encoder.AppendAddress(file_addr);
+      encoder.AppendData(data_after_op);
+      m_data.SetData(encoder.GetDataBuffer());
+      return true;
+    }
+    const offset_t op_arg_size =
+        GetOpcodeDataSize(m_data, offset, op, dwarf_cu);
+    if (op_arg_size == LLDB_INVALID_OFFSET)
+      break;
+    offset += op_arg_size;
   }
   return false;
 }


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