[Lldb-commits] [PATCH] D65498: Fix completion for functions in anonymous namespaces

Jonas Devlieghere via Phabricator via lldb-commits lldb-commits at lists.llvm.org
Tue Jul 30 23:01:11 PDT 2019

JDevlieghere created this revision.
JDevlieghere added reviewers: labath, teemperor, jingham.
JDevlieghere added a project: LLDB.
Herald added subscribers: abidh, aprantl.

I was going through some of the old bugs and came across PR21069 which I was able to reproduce. The issue is that we match the regex `^foo` against the `DW_AT_name` in the DWARF, which for our anonymous function is indeed `foo`. However, when we get the function name from the symbol context, the result is `(anonymous namespace)::foo()`. This throws off completions, which assumes that it's appending to whatever is already present on the input, resulting in a bogus `b fooonymous\ namespace)::foo()`.

I'm not super familiar with the completion framework, so please let me know if there's a better way to solve this issue.





Index: lldb/source/Commands/CommandCompletions.cpp
--- lldb/source/Commands/CommandCompletions.cpp
+++ lldb/source/Commands/CommandCompletions.cpp
@@ -471,7 +471,11 @@
     for (uint32_t i = 0; i < sc_list.GetSize(); i++) {
       if (sc_list.GetContextAtIndex(i, sc)) {
         ConstString func_name = sc.GetFunctionName(Mangled::ePreferDemangled);
-        if (!func_name.IsEmpty())
+        // Ensure that the function name matches the regex. This is more than a
+        // sanity check. It is possible that the demangled function name does
+        // not start with the prefix, for example when it's in an anonymous
+        // namespace.
+        if (!func_name.IsEmpty() && m_regex.Execute(func_name.GetStringRef()))
Index: lldb/packages/Python/lldbsuite/test/functionalities/completion/main.cpp
--- lldb/packages/Python/lldbsuite/test/functionalities/completion/main.cpp
+++ lldb/packages/Python/lldbsuite/test/functionalities/completion/main.cpp
@@ -7,6 +7,8 @@
+namespace { int Quux (void) { return 0; } }
 struct Container { int MemberVar; };
 int main()
@@ -17,5 +19,6 @@
     Container container;
     Container *ptr_container = &container;
+    int q = Quux();
     return container.MemberVar = 3; // Break here
Index: lldb/packages/Python/lldbsuite/test/functionalities/completion/TestCompletion.py
--- lldb/packages/Python/lldbsuite/test/functionalities/completion/TestCompletion.py
+++ lldb/packages/Python/lldbsuite/test/functionalities/completion/TestCompletion.py
@@ -297,3 +297,6 @@
         self.complete_from_to('breakpoint set -n Fo',
                               'breakpoint set -n Foo::Bar(int,\\ int)',
+        # No completion for Qu because the candidate is
+        # (anonymous namespace)::Quux().
+        self.complete_from_to('breakpoint set -n Qu', '')

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