From 06e863f2902b8ba55b056308875c19f7ba3dab25 Mon Sep 17 00:00:00 2001
From: Eli Friedman <eli.friedman@gmail.com>
Date: Tue, 13 May 2008 23:18:27 +0000
Subject: [PATCH] Add codegen support for block-level compound literals.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@51081 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/CodeGen/CGExpr.cpp          | 20 ++++++++++++++++++++
 lib/CodeGen/CGExprScalar.cpp    |  5 +----
 lib/CodeGen/CodeGenFunction.h   |  2 ++
 test/CodeGen/compound-literal.c | 13 +++++++++++++
 4 files changed, 36 insertions(+), 4 deletions(-)
 create mode 100644 test/CodeGen/compound-literal.c

diff --git a/lib/CodeGen/CGExpr.cpp b/lib/CodeGen/CGExpr.cpp
index addd939348..d6791074c7 100644
--- a/lib/CodeGen/CGExpr.cpp
+++ b/lib/CodeGen/CGExpr.cpp
@@ -106,6 +106,8 @@ LValue CodeGenFunction::EmitLValue(const Expr *E) {
   case Expr::ExtVectorElementExprClass:
     return EmitExtVectorElementExpr(cast<ExtVectorElementExpr>(E));
   case Expr::MemberExprClass: return EmitMemberExpr(cast<MemberExpr>(E));
+  case Expr::CompoundLiteralExprClass:
+    return EmitCompoundLiteralLValue(cast<CompoundLiteralExpr>(E));
   }
 }
 
@@ -563,6 +565,24 @@ LValue CodeGenFunction::EmitLValueForField(llvm::Value* BaseValue,
                               Field->getType()->isSignedIntegerType());
 }
 
+LValue CodeGenFunction::EmitCompoundLiteralLValue(const CompoundLiteralExpr* E) {
+  const llvm::Type *LTy = ConvertType(E->getType());
+  llvm::Value *DeclPtr = CreateTempAlloca(LTy, ".compoundliteral");
+
+  const Expr* InitExpr = E->getInitializer();
+  LValue Result = LValue::MakeAddr(DeclPtr);
+
+  if (E->getType()->isComplexType()) {
+    EmitComplexExprIntoAddr(InitExpr, DeclPtr, false);
+  } else if (hasAggregateLLVMType(E->getType())) {
+    EmitAnyExpr(InitExpr, DeclPtr, false);
+  } else {
+    EmitStoreThroughLValue(EmitAnyExpr(InitExpr), Result, E->getType());
+  }
+
+  return Result;
+}
+
 //===--------------------------------------------------------------------===//
 //                             Expression Emission
 //===--------------------------------------------------------------------===//
diff --git a/lib/CodeGen/CGExprScalar.cpp b/lib/CodeGen/CGExprScalar.cpp
index a501145a49..4fb69d045e 100644
--- a/lib/CodeGen/CGExprScalar.cpp
+++ b/lib/CodeGen/CGExprScalar.cpp
@@ -129,6 +129,7 @@ public:
   Value *VisitArraySubscriptExpr(ArraySubscriptExpr *E);
   Value *VisitMemberExpr(Expr *E)           { return EmitLoadOfLValue(E); }
   Value *VisitExtVectorElementExpr(Expr *E) { return EmitLoadOfLValue(E); }
+  Value *VisitCompoundLiteralExpr(CompoundLiteralExpr *E) { return EmitLoadOfLValue(E); }
   Value *VisitStringLiteral(Expr *E)  { return EmitLValue(E).getAddress(); }
   Value *VisitPreDefinedExpr(Expr *E) { return EmitLValue(E).getAddress(); }
 
@@ -165,10 +166,6 @@ public:
     
     return V;
   }
-
-  Value *VisitCompoundLiteralExpr(CompoundLiteralExpr *E) {
-    return Visit(E->getInitializer());
-  }
   
   Value *VisitImplicitCastExpr(const ImplicitCastExpr *E);
   Value *VisitCastExpr(const CastExpr *E) { 
diff --git a/lib/CodeGen/CodeGenFunction.h b/lib/CodeGen/CodeGenFunction.h
index f067a0e225..0693781bce 100644
--- a/lib/CodeGen/CodeGenFunction.h
+++ b/lib/CodeGen/CodeGenFunction.h
@@ -69,6 +69,7 @@ namespace clang {
   class ObjCStringLiteral;
   class ObjCIvarRefExpr;
   class MemberExpr;
+  class CompoundLiteralExpr;
 
   class VarDecl;
   class EnumConstantDecl;
@@ -431,6 +432,7 @@ public:
   LValue EmitArraySubscriptExpr(const ArraySubscriptExpr *E);
   LValue EmitExtVectorElementExpr(const ExtVectorElementExpr *E);
   LValue EmitMemberExpr(const MemberExpr *E);
+  LValue EmitCompoundLiteralLValue(const CompoundLiteralExpr *E);
 
   LValue EmitLValueForField(llvm::Value* Base, FieldDecl* Field,
                             bool isUnion);
diff --git a/test/CodeGen/compound-literal.c b/test/CodeGen/compound-literal.c
new file mode 100644
index 0000000000..bc185b24dc
--- /dev/null
+++ b/test/CodeGen/compound-literal.c
@@ -0,0 +1,13 @@
+// RUN: clang < %s -emit-llvm
+
+int* a = &(int){1};
+struct s {int a, b, c;} * b = &(struct s) {1, 2, 3};
+// Not working; complex constants are broken
+// _Complex double * x = &(_Complex double){1.0f};
+
+int xxx() {
+int* a = &(int){1};
+struct s {int a, b, c;} * b = &(struct s) {1, 2, 3};
+_Complex double * x = &(_Complex double){1.0f};
+_Complex double * y = &(_Complex double){};
+}
-- 
2.50.1