Implementing C99 partial re-initialization behavior (DR-253)

Based on previous discussion on the mailing list, clang currently lacks support
for C99 partial re-initialization behavior:
Reference: http://lists.cs.uiuc.edu/pipermail/cfe-dev/2013-April/029188.html
Reference: http://www.open-std.org/jtc1/sc22/wg14/www/docs/dr_253.htm

This patch attempts to fix this problem.

Given the following code snippet,

struct P1 { char x[6]; };
struct LP1 { struct P1 p1; };

struct LP1 l = { .p1 = { "foo" }, .p1.x[2] = 'x' };
// this example is adapted from the example for "struct fred x[]" in DR-253;
// currently clang produces in l: { "\0\0x" },
//   whereas gcc 4.8 produces { "fox" };
// with this fix, clang will also produce: { "fox" };


Differential Review: http://reviews.llvm.org/D5789



git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@239446 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 2 insertions, 0 deletions

diff --git a/include/clang/Basic/StmtNodes.td b/include/clang/Basic/StmtNodes.td
index 750108f39f..790250db8d 100644
--- a/include/clang/Basic/StmtNodes.td
+++ b/include/clang/Basic/StmtNodes.td
@@ -77,7 +77,9 @@ def CompoundLiteralExpr : DStmt<Expr>;
 def ExtVectorElementExpr : DStmt<Expr>;
 def InitListExpr : DStmt<Expr>;
 def DesignatedInitExpr : DStmt<Expr>;
+def DesignatedInitUpdateExpr : DStmt<Expr>;
 def ImplicitValueInitExpr : DStmt<Expr>;
+def NoInitExpr : DStmt<Expr>;
 def ParenListExpr : DStmt<Expr>;
 def VAArgExpr : DStmt<Expr>;
 def GenericSelectionExpr : DStmt<Expr>;