[lldb] Fix crash when looking up type coming from the ClangModuleDeclVendor

Summary:
We assume in LLDB that every type comes from an ASTContext with an associated ClangASTContext.
However the types inside the ClangModuleDeclVendor don't have a ClangASTContext so we end up
crashing whenever we create a CompilerType for one of these types.

Simplest way to trigger this bug is to just look up NSObject from a module:
   (lldb) expr @import Foundation
   (lldb) type lookup NSObject
   Assertion failed: (m_type_system != nullptr), function CompilerType, file /Users/teemperor/llvm1/llvm-project/lldb/source/Symbol/CompilerType.cpp, line 39.

This patch just creates a ClangASTContext for the ASTContext used by ClangModuleDeclVendor.

Reviewers: davide, shafik

Reviewed By: davide

Subscribers: lldb-commits

Tags: #lldb

Differential Revision: https://reviews.llvm.org/D64989

llvm-svn: 366653

1 files changed, 4 insertions, 0 deletions

diff --git a/lldb/packages/Python/lldbsuite/test/lang/objc/modules/TestObjCModules.py b/lldb/packages/Python/lldbsuite/test/lang/objc/modules/TestObjCModules.py
index 8f5c407000c..4e40c58effa 100644
--- a/lldb/packages/Python/lldbsuite/test/lang/objc/modules/TestObjCModules.py
+++ b/lldb/packages/Python/lldbsuite/test/lang/objc/modules/TestObjCModules.py
@@ -60,6 +60,10 @@ class ObjCModulesTestCase(TestBase):
                 "int",
                 "4"])
 
+        # Type lookup should still work and print something reasonable
+        # for types from the module.
+        self.expect("type lookup NSObject", substrs=["instanceMethod"])
+
         self.expect("expr string.length", VARIABLES_DISPLAYED_CORRECTLY,
                     substrs=["NSUInteger", "5"])