Added support for persistent types to the

expression parser.  You can use a persistent
type like this:

(lldb) expr struct $foo { int a; int b; };
(lldb) struct $foo i; i.a = 2; i.b = 3; i
($foo) $0 = {
  (int) a = 2
  (int) b = 3
}

typedefs work similarly.

This patch affects the following files:

test/expression_command/persistent_types/*
  A test case for persistent types,
  in particular structs and typedefs.

ClangForward.h
  Added TypeDecl, needed to declare some
  functions in ASTResultSynthesizer.h

ClangPersistentVariables.[h,cpp]
  Added a list of persistent types to the
  persistent variable store.

ASTResultSynthesizer.[h,cpp]
  Made the AST result synthesizer iterate
  across TypeDecls in the expression, and
  record any persistent types found.  Also
  made a minor documentation fix.

ClangUserExpression.[h,cpp]
  Extended the user expression class to
  keep the state needed to report the
  persistent variable store for the target
  to the AST result synthesizers. 

  Also introduced a new error code for
  expressions that executed normally but
  did not return a result.

CommandObjectExpression.cpp
  Improved output for expressions (like 
  declarations of new persistent types) that
  don't return a result.  This is no longer
  treated as an error.

llvm-svn: 138383

1 files changed, 36 insertions, 0 deletions

diff --git a/lldb/source/Expression/ClangExpressionDeclMap.cpp b/lldb/source/Expression/ClangExpressionDeclMap.cpp
index 08e7724d0fc..75387a9d33c 100644
--- a/lldb/source/Expression/ClangExpressionDeclMap.cpp
+++ b/lldb/source/Expression/ClangExpressionDeclMap.cpp
@@ -1945,6 +1945,42 @@ ClangExpressionDeclMap::GetDecls (NameSearchContext &context, const ConstString
             return;
         }
 
+        do
+        {
+            if (!m_parser_vars->m_exe_ctx->target)
+                break;
+            
+            ClangASTContext *scratch_clang_ast_context = m_parser_vars->m_exe_ctx->target->GetScratchClangASTContext();
+            
+            if (!scratch_clang_ast_context)
+                break;
+            
+            ASTContext *scratch_ast_context = scratch_clang_ast_context->getASTContext();
+            
+            if (!scratch_ast_context)
+                break;
+            
+            TypeDecl *ptype_type_decl = m_parser_vars->m_persistent_vars->GetPersistentType(name);
+
+            if (!ptype_type_decl)
+                break;
+            
+            Decl *parser_ptype_decl = ClangASTContext::CopyDecl(context.GetASTContext(), scratch_ast_context, ptype_type_decl);
+            
+            if (!parser_ptype_decl)
+                break;
+            
+            TypeDecl *parser_ptype_type_decl = dyn_cast<TypeDecl>(parser_ptype_decl);
+            
+            if (!parser_ptype_type_decl)
+                break;
+            
+            if (log)
+                log->Printf("Found persistent type %s", name.GetCString());
+            
+            context.AddNamedDecl(parser_ptype_type_decl);
+        } while (0);
+        
         ClangExpressionVariableSP pvar_sp(m_parser_vars->m_persistent_vars->GetVariable(name));
     
         if (pvar_sp)