DWARFExpression: Convert file addresses to load addresses early on.

This is a change that only affects Swift and is NFC for the language
plugins on llvm.org. In Swift, we can have global variables with a
location such as DW_OP_addr <addr> DW_OP_deref. The DWARF expression
evaluator doesn't know how to apply a DW_OP_deref to a file address,
but at the very end we convert the file address into a load address.

This patch moves the file->load address conversion to right after the
result of the DW_OP_addr is pushed onto the stack so that a subsequent
DW_OP_deref (and potentially other operations) can be interpreted.

rdar://problem/39767528

Differential revision: https://reviews.llvm.org/D46362

llvm-svn: 331462

1 files changed, 3 insertions, 19 deletions

diff --git a/lldb/source/Core/ValueObjectVariable.cpp b/lldb/source/Core/ValueObjectVariable.cpp
index e08963210ec..e446e2eae07 100644
--- a/lldb/source/Core/ValueObjectVariable.cpp
+++ b/lldb/source/Core/ValueObjectVariable.cpp
@@ -234,26 +234,10 @@ bool ValueObjectVariable::UpdateValue() {
         // If this variable is a simple type, we read all data for it into
         // m_data. Make sure this type has a value before we try and read it
 
+        SymbolContext var_sc;
+        variable->CalculateSymbolContext(&var_sc);
         // If we have a file address, convert it to a load address if we can.
-        if (value_type == Value::eValueTypeFileAddress && process_is_alive) {
-          lldb::addr_t file_addr =
-              m_value.GetScalar().ULongLong(LLDB_INVALID_ADDRESS);
-          if (file_addr != LLDB_INVALID_ADDRESS) {
-            SymbolContext var_sc;
-            variable->CalculateSymbolContext(&var_sc);
-            if (var_sc.module_sp) {
-              ObjectFile *objfile = var_sc.module_sp->GetObjectFile();
-              if (objfile) {
-                Address so_addr(file_addr, objfile->GetSectionList());
-                lldb::addr_t load_addr = so_addr.GetLoadAddress(target);
-                if (load_addr != LLDB_INVALID_ADDRESS) {
-                  m_value.SetValueType(Value::eValueTypeLoadAddress);
-                  m_value.GetScalar() = load_addr;
-                }
-              }
-            }
-          }
-        }
+        m_value.ConvertToLoadAddress(var_sc);
 
         if (!CanProvideValue()) {
           // this value object represents an aggregate type whose children have