From 2663f527c2717295fbaed4715945b879ad68f4cf Mon Sep 17 00:00:00 2001
From: Fariborz Jahanian <fjahanian@apple.com>
Date: Thu, 4 Feb 2010 00:07:58 +0000
Subject: [PATCH] Fix rewriting of 'const' __block variables in the rewriter.
 (Fixes radar 7607781).

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@95267 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Frontend/RewriteObjC.cpp | 18 ++++++++++++++++--
 test/Rewriter/blockcast3.mm  | 23 +++++++++++++++++++++++
 2 files changed, 39 insertions(+), 2 deletions(-)
 create mode 100644 test/Rewriter/blockcast3.mm

diff --git a/lib/Frontend/RewriteObjC.cpp b/lib/Frontend/RewriteObjC.cpp
index 9ec28bb6d4..32cc7472ae 100644
--- a/lib/Frontend/RewriteObjC.cpp
+++ b/lib/Frontend/RewriteObjC.cpp
@@ -4604,10 +4604,12 @@ void RewriteObjC::RewriteByRefVar(VarDecl *ND) {
   Name = ND->getNameAsString();
   ByrefType.clear();
   RewriteByRefString(ByrefType, Name, ND);
+  std::string ForwardingCastType("(");
+  ForwardingCastType += ByrefType + " *)";
   if (!hasInit) {
     ByrefType += " " + Name + " = {(void*)";
     ByrefType += utostr(isa);
-    ByrefType += ", &" + Name + ", ";
+    ByrefType += "," +  ForwardingCastType + "&" + Name + ", ";
     ByrefType += utostr(flags);
     ByrefType += ", ";
     ByrefType += "sizeof(";
@@ -4636,7 +4638,7 @@ void RewriteObjC::RewriteByRefVar(VarDecl *ND) {
     ByrefType += " " + Name;
     ByrefType += " = {(void*)";
     ByrefType += utostr(isa);
-    ByrefType += ", &" + Name + ", ";
+    ByrefType += "," +  ForwardingCastType + "&" + Name + ", ";
     ByrefType += utostr(flags);
     ByrefType += ", ";
     ByrefType += "sizeof(";
@@ -4784,11 +4786,23 @@ Stmt *RewriteObjC::SynthBlockInitExpr(BlockExpr *Exp) {
     // Output all "by ref" declarations.
     for (llvm::SmallPtrSet<ValueDecl*,8>::iterator I = BlockByRefDecls.begin(),
          E = BlockByRefDecls.end(); I != E; ++I) {
+      ValueDecl *ND = (*I);
+      std::string Name(ND->getNameAsString());
+      std::string RecName;
+      RewriteByRefString(RecName, Name, ND);
+      IdentifierInfo *II = &Context->Idents.get(RecName.c_str() 
+                                                + sizeof("struct"));
+      RecordDecl *RD = RecordDecl::Create(*Context, TagDecl::TK_struct, TUDecl,
+                                          SourceLocation(), II);
+      assert(RD && "SynthBlockInitExpr(): Can't find RecordDecl");
+      QualType castT = Context->getPointerType(Context->getTagDeclType(RD));
+      
       FD = SynthBlockInitFunctionDecl((*I)->getNameAsCString());
       Exp = new (Context) DeclRefExpr(FD, FD->getType(), SourceLocation());
       Exp = new (Context) UnaryOperator(Exp, UnaryOperator::AddrOf,
                               Context->getPointerType(Exp->getType()),
                               SourceLocation());
+      Exp = NoTypeInfoCStyleCastExpr(Context, castT, CastExpr::CK_Unknown, Exp);
       InitExprs.push_back(Exp);
     }
   }
diff --git a/test/Rewriter/blockcast3.mm b/test/Rewriter/blockcast3.mm
new file mode 100644
index 0000000000..97f417cec9
--- /dev/null
+++ b/test/Rewriter/blockcast3.mm
@@ -0,0 +1,23 @@
+// RUN: %clang_cc1 -x objective-c++ -fblocks -fms-extensions -rewrite-objc %s -o %t-rw.cpp
+// RUN: FileCheck -check-prefix LP --input-file=%t-rw.cpp %s
+// radar 7607781
+
+typedef struct {
+	int a;
+	int b;
+} mystruct;
+	
+void g(int (^block)(mystruct s)) {
+	mystruct x;
+	int v = block(x);
+}
+
+void f(const void **arg) {
+	__block const void **q = arg;
+	g(^(mystruct s){
+		*q++ = (void*)s.a;
+		return 314;
+		});
+}
+
+// CHECK-LP: (struct __Block_byref_q_0 *)&q
-- 
2.40.0