diff --git a/clang/CodeGen/CGExpr.cpp b/clang/CodeGen/CGExpr.cpp index 4cb897fe5d12..84879bb28e9d 100644 --- a/clang/CodeGen/CGExpr.cpp +++ b/clang/CodeGen/CGExpr.cpp @@ -87,6 +87,7 @@ LValue CodeGenFunction::EmitLValue(const Expr *E) { return LValue::MakeAddr(llvm::UndefValue::get(Ty)); } + case Expr::CallExprClass: return EmitCallExprLValue(cast(E)); case Expr::DeclRefExprClass: return EmitDeclRefLValue(cast(E)); case Expr::ParenExprClass:return EmitLValue(cast(E)->getSubExpr()); case Expr::PreDefinedExprClass: @@ -455,6 +456,12 @@ RValue CodeGenFunction::EmitCallExpr(const CallExpr *E) { return EmitCallExpr(Callee, E); } +LValue CodeGenFunction::EmitCallExprLValue(const CallExpr *E) { + // Can only get l-value for call expression returning aggregate type + RValue RV = EmitCallExpr(E); + return LValue::MakeAddr(RV.getAggregateAddr()); +} + RValue CodeGenFunction::EmitCallExpr(llvm::Value *Callee, const CallExpr *E) { // The callee type will always be a pointer to function type, get the function // type. diff --git a/clang/CodeGen/CodeGenFunction.h b/clang/CodeGen/CodeGenFunction.h index 3b51d43de985..40c7414b9823 100644 --- a/clang/CodeGen/CodeGenFunction.h +++ b/clang/CodeGen/CodeGenFunction.h @@ -371,6 +371,9 @@ public: /// is 'Ty'. void EmitStoreThroughLValue(RValue Src, LValue Dst, QualType Ty); void EmitStoreThroughOCUComponentLValue(RValue Src, LValue Dst, QualType Ty); + + // Note: only availabe for agg return types + LValue EmitCallExprLValue(const CallExpr *E); LValue EmitDeclRefLValue(const DeclRefExpr *E); LValue EmitStringLiteralLValue(const StringLiteral *E); diff --git a/clang/test/CodeGen/func-return-member.c b/clang/test/CodeGen/func-return-member.c new file mode 100644 index 000000000000..f31a53afceeb --- /dev/null +++ b/clang/test/CodeGen/func-return-member.c @@ -0,0 +1,23 @@ +// RUN: clang -emit-llvm < %s 2>&1 | not grep 'cannot codegen this l-value expression yet' + +struct frk { float _Complex c; int x; }; +struct faz { struct frk f; }; +struct fuz { struct faz f; }; + +extern struct fuz foo(void); + +int X; +struct frk F; +float _Complex C; + +void bar(void) { + X = foo().f.f.x; +} + +void bun(void) { + F = foo().f.f; +} + +void ban(void) { + C = foo().f.f.c; +}