Added initial code completion support for the `expr` command

Summary:
This patch adds initial code completion support for the `expr` command.

We now have a completion handler in the expression CommandObject that
essentially just attempts to parse the given user expression with Clang with
an attached code completion consumer. We filter and prepare the
code completions provided by Clang and send them back to the completion
API.

The current completion is limited to variables that are in the current scope.
This includes local variables and all types used by local variables. We however
don't do any completion of symbols that are not used in the local scope (or
in some other way already in the ASTContext).

This is partly because there is not yet any code that manually searches for additiona
information in the debug information. Another cause is that for some reason the existing
code for loading these additional symbols when requested by Clang doesn't seem to work.
This will be fixed in a future patch.

Reviewers: jingham, teemperor

Reviewed By: teemperor

Subscribers: labath, aprantl, JDevlieghere, friss, lldb-commits

Differential Revision: https://reviews.llvm.org/D48465

llvm-svn: 341086

1 files changed, 35 insertions, 0 deletions

diff --git a/lldb/packages/Python/lldbsuite/test/expression_command/completion/main.cpp b/lldb/packages/Python/lldbsuite/test/expression_command/completion/main.cpp
new file mode 100644
index 00000000000..908bebbebff
--- /dev/null
+++ b/lldb/packages/Python/lldbsuite/test/expression_command/completion/main.cpp
@@ -0,0 +1,35 @@
+namespace LongNamespaceName { class NestedClass { long m; }; }
+
+// Defined in other.cpp, we only have a forward declaration here.
+struct ForwardDecl;
+extern ForwardDecl fwd_decl;
+
+class LongClassName { long i ; };
+
+class Expr {
+public:
+    int FooNoArgsBar() { return 1; }
+    int FooWithArgsBar(int i) { return i; }
+    int FooWithMultipleArgsBar(int i, int j) { return i + j; }
+    int FooUnderscoreBar_() { return 4; }
+    int FooNumbersBar1() { return 8; }
+    int MemberVariableBar = 0;
+    Expr &Self() { return *this; }
+    static int StaticMemberMethodBar() { return 82; }
+};
+
+int main()
+{
+    LongClassName a;
+    LongNamespaceName::NestedClass NestedFoo;
+    long SomeLongVarNameWithCapitals = 44;
+    int SomeIntVar = 33;
+    Expr some_expr;
+    some_expr.FooNoArgsBar();
+    some_expr.FooWithArgsBar(1);
+    some_expr.FooUnderscoreBar_();
+    some_expr.FooNumbersBar1();
+    Expr::StaticMemberMethodBar();
+    ForwardDecl *fwd_decl_ptr = &fwd_decl;
+    return 0; // Break here
+}