Basic code generation support for std::initializer_list.

We now generate temporary arrays to back std::initializer_list objects
initialized with braces. The initializer_list is then made to point at
the array. We support both ptr+size and start+end forms, although
the latter is untested.

Array lifetime is correct for temporary std::initializer_lists (e.g.
call arguments) and local variables. It is untested for new expressions
and member initializers.

Things left to do:
Massively increase the amount of testing. I need to write tests for
start+end init lists, temporary objects created as a side effect of
initializing init list objects, new expressions, member initialization,
creation of temporary objects (e.g. std::vector) for initializer lists,
and probably more.
Get lifetime "right" for member initializers and new expressions. Not
that either are very useful.
Implement list-initialization of array new expressions.

llvm-svn: 150803

1 files changed, 4 insertions, 3 deletions

diff --git a/clang/lib/AST/Expr.cpp b/clang/lib/AST/Expr.cpp
index d5eab77816c..b3077cbaa4c 100644
--- a/clang/lib/AST/Expr.cpp
+++ b/clang/lib/AST/Expr.cpp
@@ -1433,9 +1433,10 @@ InitListExpr::InitListExpr(ASTContext &C, SourceLocation lbraceloc,
   : Expr(InitListExprClass, QualType(), VK_RValue, OK_Ordinary, false, false,
          false, false),
     InitExprs(C, numInits),
-    LBraceLoc(lbraceloc), RBraceLoc(rbraceloc), SyntacticForm(0),
-    HadArrayRangeDesignator(false) 
-{      
+    LBraceLoc(lbraceloc), RBraceLoc(rbraceloc), SyntacticForm(0)
+{
+  sawArrayRangeDesignator(false);
+  setInitializesStdInitializerList(false);
   for (unsigned I = 0; I != numInits; ++I) {
     if (initExprs[I]->isTypeDependent())
       ExprBits.TypeDependent = true;