[Lldb-commits] [PATCH] D31368: Add support for sythetic operator dereference

[Tamas Berghammer via Phabricator via lldb-commits]

tberghammer created this revision.

After this change a sythetic child provider can generate a special child
named "$$dereference$$" what if present is used when "operator*" or
"operator->" used on a ValueObject. The goal of the change is to make
expressions like "up->foo" work inside the "frame variable" command.


https://reviews.llvm.org/D31368

Files:
  
packages/Python/lldbsuite/test/functionalities/data-formatter/data-formatter-stl/libstdcpp/unique_ptr/TestDataFormatterStdUniquePtr.py
  source/Core/ValueObject.cpp
  source/Plugins/Language/CPlusPlus/LibStdcppUniquePointer.cpp
  source/Target/StackFrame.cpp


Index: source/Target/StackFrame.cpp
===================================================================
--- source/Target/StackFrame.cpp
+++ source/Target/StackFrame.cpp
@@ -606,8 +606,10 @@
     // Calculate the next separator index ahead of time
     ValueObjectSP child_valobj_sp;
     const char separator_type = var_expr[0];
+    bool expr_is_ptr = false;
     switch (separator_type) {
     case '-':
+      expr_is_ptr = true;
       if (var_expr.size() >= 2 && var_expr[1] != '>')
         return ValueObjectSP();
 
@@ -624,11 +626,24 @@
           return ValueObjectSP();
         }
       }
+
+      // If we have a non pointer type with a sythetic value then lets check if
+      // we have an sythetic dereference specified.
+      if (!valobj_sp->IsPointerType() && valobj_sp->HasSyntheticValue()) {
+        valobj_sp = valobj_sp->GetSyntheticValue()->GetChildMemberWithName(
+            ConstString("$$dereference$$"), true);
+        if (valobj_sp) {
+          expr_is_ptr = false;
+        } else {
+          error.SetErrorString(
+              "Failed to access synthetic dereference member.");
+          return ValueObjectSP();
+        }
+      }
+
       var_expr = var_expr.drop_front(); // Remove the '-'
       LLVM_FALLTHROUGH;
     case '.': {
-      const bool expr_is_ptr = var_expr[0] == '>';
-
       var_expr = var_expr.drop_front(); // Remove the '.' or '>'
       separator_idx = var_expr.find_first_of(".-[");
       ConstString child_name(var_expr.substr(0, var_expr.find_first_of(".-[")));
Index: source/Plugins/Language/CPlusPlus/LibStdcppUniquePointer.cpp
===================================================================
--- source/Plugins/Language/CPlusPlus/LibStdcppUniquePointer.cpp
+++ source/Plugins/Language/CPlusPlus/LibStdcppUniquePointer.cpp
@@ -114,7 +114,8 @@
     return 0;
   if (name == ConstString("del") || name == ConstString("deleter"))
     return 1;
-  if (name == ConstString("obj") || name == ConstString("object"))
+  if (name == ConstString("obj") || name == ConstString("object") ||
+      name == ConstString("$$dereference$$"))
     return 2;
   return UINT32_MAX;
 }
Index: source/Core/ValueObject.cpp
===================================================================
--- source/Core/ValueObject.cpp
+++ source/Core/ValueObject.cpp
@@ -2889,6 +2889,11 @@
           child_is_base_class, child_is_deref_of_parent, eAddressTypeInvalid,
           language_flags);
     }
+  } else if (HasSyntheticValue()) {
+    m_deref_valobj =
+        GetSyntheticValue()
+            ->GetChildMemberWithName(ConstString("$$dereference$$"), true)
+            .get();
   }
 
   if (m_deref_valobj) {
Index: packages/Python/lldbsuite/test/functionalities/data-formatter/data-formatter-stl/libstdcpp/unique_ptr/TestDataFormatterStdUniquePtr.py
===================================================================
--- packages/Python/lldbsuite/test/functionalities/data-formatter/data-formatter-stl/libstdcpp/unique_ptr/TestDataFormatterStdUniquePtr.py
+++ packages/Python/lldbsuite/test/functionalities/data-formatter/data-formatter-stl/libstdcpp/unique_ptr/TestDataFormatterStdUniquePtr.py
@@ -42,13 +42,17 @@
         self.expect("frame variable sdp", substrs=['sdp = 0x', 'deleter = ', 'a = 3', 'b = 4'])
 
         self.assertEqual(123, frame.GetValueForVariablePath("iup.object").GetValueAsUnsigned())
+        self.assertEqual(123, frame.GetValueForVariablePath("*iup").GetValueAsUnsigned())
         self.assertFalse(frame.GetValueForVariablePath("iup.deleter").IsValid())
 
         self.assertEqual('"foobar"', frame.GetValueForVariablePath("sup.object").GetSummary())
+        self.assertEqual('"foobar"', frame.GetValueForVariablePath("*sup").GetSummary())
         self.assertFalse(frame.GetValueForVariablePath("sup.deleter").IsValid())
 
         self.assertEqual(456, frame.GetValueForVariablePath("idp.object").GetValueAsUnsigned())
+        self.assertEqual(456, frame.GetValueForVariablePath("*idp").GetValueAsUnsigned())
         self.assertEqual('"baz"', frame.GetValueForVariablePath("sdp.object").GetSummary())
+        self.assertEqual('"baz"', frame.GetValueForVariablePath("*sdp").GetSummary())
 
         idp_deleter = frame.GetValueForVariablePath("idp.deleter")
         self.assertTrue(idp_deleter.IsValid())
@@ -86,5 +90,7 @@
         frame = self.frame()
         self.assertTrue(frame.IsValid())
         self.assertEqual(2, frame.GetValueForVariablePath("f1->fp.object.data").GetValueAsUnsigned())
+        self.assertEqual(2, frame.GetValueForVariablePath("f1->fp->data").GetValueAsUnsigned())
         self.assertEqual(1, frame.GetValueForVariablePath("f1->fp.object.fp.object.data").GetValueAsUnsigned())
+        self.assertEqual(1, frame.GetValueForVariablePath("f1->fp->fp->data").GetValueAsUnsigned())
 

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