From: Richard Smith <richard-llvm@metafoo.co.uk>
Date: Tue, 22 Nov 2011 22:48:32 +0000 (+0000)
Subject: Use static storage duration for file-scope compound literals, even when they
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=7401cf524cdb7aad4951d8727d280f8b271af5a2;p=clang

Use static storage duration for file-scope compound literals, even when they
appear in non-constant initializers in C++.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@145087 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/CodeGen/CGExpr.cpp b/lib/CodeGen/CGExpr.cpp
index a35bb5f711..e4f81b7a3f 100644
--- a/lib/CodeGen/CGExpr.cpp
+++ b/lib/CodeGen/CGExpr.cpp
@@ -1947,6 +1947,11 @@ CodeGenFunction::EmitLValueForFieldInitialization(llvm::Value *BaseValue,
 }
 
 LValue CodeGenFunction::EmitCompoundLiteralLValue(const CompoundLiteralExpr *E){
+  if (E->isFileScope()) {
+    llvm::Value *GlobalPtr = CGM.GetAddrOfConstantCompoundLiteral(E);
+    return MakeAddrLValue(GlobalPtr, E->getType());
+  }
+
   llvm::Value *DeclPtr = CreateMemTemp(E->getType(), ".compoundliteral");
   const Expr *InitExpr = E->getInitializer();
   LValue Result = MakeAddrLValue(DeclPtr, E->getType());
diff --git a/lib/CodeGen/CGExprConstant.cpp b/lib/CodeGen/CGExprConstant.cpp
index 7485c71d7d..5d436619d7 100644
--- a/lib/CodeGen/CGExprConstant.cpp
+++ b/lib/CodeGen/CGExprConstant.cpp
@@ -1087,6 +1087,12 @@ llvm::Constant *CodeGenModule::EmitConstantExpr(const Expr *E,
   return C;
 }
 
+llvm::Constant *
+CodeGenModule::GetAddrOfConstantCompoundLiteral(const CompoundLiteralExpr *E) {
+  assert(E->isFileScope() && "not a file-scope compound literal expr");
+  return ConstExprEmitter(*this, 0).EmitLValue(E);
+}
+
 static uint64_t getFieldOffset(ASTContext &C, const FieldDecl *field) {
   const ASTRecordLayout &layout = C.getASTRecordLayout(field->getParent());
   return layout.getFieldOffset(field->getFieldIndex());
diff --git a/lib/CodeGen/CodeGenModule.h b/lib/CodeGen/CodeGenModule.h
index 7b82819af3..4c31737b29 100644
--- a/lib/CodeGen/CodeGenModule.h
+++ b/lib/CodeGen/CodeGenModule.h
@@ -599,6 +599,10 @@ public:
   llvm::Constant *GetAddrOfConstantCString(const std::string &str,
                                            const char *GlobalName=0,
                                            unsigned Alignment=1);
+
+  /// GetAddrOfConstantCompoundLiteral - Returns a pointer to a constant global
+  /// variable for the given file-scope compound literal expression.
+  llvm::Constant *GetAddrOfConstantCompoundLiteral(const CompoundLiteralExpr*E);
   
   /// \brief Retrieve the record type that describes the state of an
   /// Objective-C fast enumeration loop (for..in).
diff --git a/test/CodeGenCXX/compound-literals.cpp b/test/CodeGenCXX/compound-literals.cpp
index f520ff9951..aa9ae3cacf 100644
--- a/test/CodeGenCXX/compound-literals.cpp
+++ b/test/CodeGenCXX/compound-literals.cpp
@@ -37,3 +37,8 @@ int g() {
   // CHECK-NEXT: ret i32 [[A0]]
   return v[0];
 }
+
+struct Z { int i[3]; };
+int *p = (Z){ {1, 2, 3} }.i;
+// CHECK: define {{.*}}__cxx_global_var_init()
+// CHECK: store i32* getelementptr inbounds (%struct.Z* @.compoundliteral, i32 0, i32 0, i32 0), i32** @p, align 8