[Lldb-commits] [lldb] [lldb] Support "dereferencing" std::optional in `frame var` (PR #107077)

[Pavel Labath via lldb-commits]

https://github.com/labath created 
https://github.com/llvm/llvm-project/pull/107077

None

>From 86b1e913b0756974b82b69f803238974f249b876 Mon Sep 17 00:00:00 2001
From: Pavel Labath <pa...@labath.sk>
Date: Tue, 3 Sep 2024 12:15:17 +0200
Subject: [PATCH] [lldb] Support "dereferencing" std::optional

---
 .../Plugins/Language/CPlusPlus/GenericOptional.cpp   |  2 ++
 .../optional/TestDataFormatterGenericOptional.py     | 12 ++++++++++++
 .../data-formatter-stl/generic/optional/main.cpp     |  5 +++++
 3 files changed, 19 insertions(+)

diff --git a/lldb/source/Plugins/Language/CPlusPlus/GenericOptional.cpp 
b/lldb/source/Plugins/Language/CPlusPlus/GenericOptional.cpp
index 23756de7f1e66e..a8a7c16de5e867 100644
--- a/lldb/source/Plugins/Language/CPlusPlus/GenericOptional.cpp
+++ b/lldb/source/Plugins/Language/CPlusPlus/GenericOptional.cpp
@@ -37,6 +37,8 @@ class GenericOptionalFrontend : public 
SyntheticChildrenFrontEnd {
   GenericOptionalFrontend(ValueObject &valobj, StdLib stdlib);
 
   size_t GetIndexOfChildWithName(ConstString name) override {
+    if (name == "$$dereference$$")
+      return 0;
     return formatters::ExtractIndexFromString(name.GetCString());
   }
 
diff --git 
a/lldb/test/API/functionalities/data-formatter/data-formatter-stl/generic/optional/TestDataFormatterGenericOptional.py
 
b/lldb/test/API/functionalities/data-formatter/data-formatter-stl/generic/optional/TestDataFormatterGenericOptional.py
index f6507294bfb2ac..7dc656a7ae225c 100644
--- 
a/lldb/test/API/functionalities/data-formatter/data-formatter-stl/generic/optional/TestDataFormatterGenericOptional.py
+++ 
b/lldb/test/API/functionalities/data-formatter/data-formatter-stl/generic/optional/TestDataFormatterGenericOptional.py
@@ -79,6 +79,18 @@ def cleanup():
             ],
         )
 
+        self.expect_var_path("*number_engaged", value="42")
+        self.expect_var_path("*x", children=[ValueCheck(name="x", value="42")])
+        self.expect_var_path("x->x", value="42")
+
+        # The error message could use some improvement, but at least we can
+        # check we don't crash.
+        self.expect(
+            "frame variable *number_not_engaged",
+            error=True,
+            substrs=["not a pointer or reference type"],
+        )
+
     @add_test_categories(["libc++"])
     ## Clang 7.0 is the oldest Clang that can reliably parse newer libc++ 
versions
     ## with -std=c++17.
diff --git 
a/lldb/test/API/functionalities/data-formatter/data-formatter-stl/generic/optional/main.cpp
 
b/lldb/test/API/functionalities/data-formatter/data-formatter-stl/generic/optional/main.cpp
index 8f30df4626636c..18a95b9cc246c6 100644
--- 
a/lldb/test/API/functionalities/data-formatter/data-formatter-stl/generic/optional/main.cpp
+++ 
b/lldb/test/API/functionalities/data-formatter/data-formatter-stl/generic/optional/main.cpp
@@ -12,6 +12,10 @@
 #define HAVE_OPTIONAL 0
 #endif
 
+struct X {
+  int x;
+};
+
 int main() {
   bool has_optional = HAVE_OPTIONAL;
 
@@ -25,6 +29,7 @@ int main() {
 
   optional_int number_not_engaged;
   optional_int number_engaged = 42;
+  std::optional<X> x = X{42};
 
   printf("%d\n", *number_engaged);
 

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