Merge pull request #411 from dcci/cherry-meee

Ignore generated @import statements in the expression evaluator

Author: dcci

lldb/source/Plugins/ExpressionParser/Clang/ClangExpressionParser.cpp

@@ -105,16 +105,26 @@ using namespace lldb_private;
 class ClangExpressionParser::LLDBPreprocessorCallbacks : public PPCallbacks {
   ClangModulesDeclVendor &m_decl_vendor;
   ClangPersistentVariables &m_persistent_vars;
+  clang::SourceManager &m_source_mgr;
   StreamString m_error_stream;
   bool m_has_errors = false;
 
 public:
   LLDBPreprocessorCallbacks(ClangModulesDeclVendor &decl_vendor,
-                            ClangPersistentVariables &persistent_vars)
-      : m_decl_vendor(decl_vendor), m_persistent_vars(persistent_vars) {}
+                            ClangPersistentVariables &persistent_vars,
+                            clang::SourceManager &source_mgr)
+      : m_decl_vendor(decl_vendor), m_persistent_vars(persistent_vars),
+        m_source_mgr(source_mgr) {}
 
   void moduleImport(SourceLocation import_location, clang::ModuleIdPath path,
                     const clang::Module * /*null*/) override {
+    // Ignore modules that are imported in the wrapper code as these are not
+    // loaded by the user.
+    llvm::StringRef filename =
+        m_source_mgr.getPresumedLoc(import_location).getFilename();
+    if (filename == ClangExpressionSourceCode::g_prefix_file_name)
+      return;
+
     SourceModule module;
 
     for (const std::pair<IdentifierInfo *, SourceLocation> &component : path)
@@ -557,8 +567,8 @@ ClangExpressionParser::ClangExpressionParser(
         llvm::cast<ClangPersistentVariables>(
             target_sp->GetPersistentExpressionStateForLanguage(
                 lldb::eLanguageTypeC));
-    std::unique_ptr<PPCallbacks> pp_callbacks(
-        new LLDBPreprocessorCallbacks(*decl_vendor, *clang_persistent_vars));
+    std::unique_ptr<PPCallbacks> pp_callbacks(new LLDBPreprocessorCallbacks(
+        *decl_vendor, *clang_persistent_vars, m_compiler->getSourceManager()));
     m_pp_callbacks =
         static_cast<LLDBPreprocessorCallbacks *>(pp_callbacks.get());
     m_compiler->getPreprocessor().addPPCallbacks(std::move(pp_callbacks));

lldb/source/Plugins/ExpressionParser/Clang/ClangExpressionSourceCode.cpp

@@ -29,9 +29,12 @@
 
 using namespace lldb_private;
 
+#define PREFIX_NAME "<lldb wrapper prefix>"
+
+const llvm::StringRef ClangExpressionSourceCode::g_prefix_file_name = PREFIX_NAME;
+
 const char *ClangExpressionSourceCode::g_expression_prefix =
-    R"(
-#line 1 "<lldb wrapper prefix>"
+"#line 1 \"" PREFIX_NAME R"("
 #ifndef offsetof
 #define offsetof(t, d) __builtin_offsetof(t, d)
 #endif

lldb/source/Plugins/ExpressionParser/Clang/ClangExpressionSourceCode.h

@@ -23,6 +23,9 @@ class ExecutionContext;
 
 class ClangExpressionSourceCode : public ExpressionSourceCode {
 public:
+  /// The file name we use for the wrapper code that we inject before
+  /// the user expression.
+  static const llvm::StringRef g_prefix_file_name;
   static const char *g_expression_prefix;
 
   static ClangExpressionSourceCode *CreateWrapped(llvm::StringRef filename,