[PATCH] Diagnose CXX "this" reference in functions with naked attr

[Weiming Zhao]

REPOSITORY
  rL LLVM

http://reviews.llvm.org/D7329

Files:
  cfe/trunk/include/clang/Basic/DiagnosticSemaKinds.td
  cfe/trunk/lib/Sema/SemaStmtAsm.cpp
  cfe/trunk/test/Sema/attr-naked.cpp

Index: cfe/trunk/lib/Sema/SemaStmtAsm.cpp
===================================================================
--- cfe/trunk/lib/Sema/SemaStmtAsm.cpp
+++ cfe/trunk/lib/Sema/SemaStmtAsm.cpp
@@ -12,6 +12,7 @@
 //===----------------------------------------------------------------------===//
 
 #include "clang/Sema/SemaInternal.h"
+#include "clang/AST/ExprCXX.h"
 #include "clang/AST/RecordLayout.h"
 #include "clang/AST/TypeLoc.h"
 #include "clang/Basic/TargetInfo.h"
@@ -86,6 +87,11 @@
   WorkList.push_back(E);
   while (WorkList.size()) {
     Expr *E = WorkList.pop_back_val();
+    if (isa<CXXThisExpr>(E)) {
+      S.Diag(E->getLocStart(), diag::err_asm_naked_this_ref);
+      S.Diag(Func->getAttr<NakedAttr>()->getLocation(), diag::note_attribute);
+      return true;
+    }
     if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E)) {
       if (isa<ParmVarDecl>(DRE->getDecl())) {
         S.Diag(DRE->getLocStart(), diag::err_asm_naked_parm_ref);
Index: cfe/trunk/test/Sema/attr-naked.cpp
===================================================================
--- cfe/trunk/test/Sema/attr-naked.cpp
+++ cfe/trunk/test/Sema/attr-naked.cpp
@@ -0,0 +1,15 @@
+// RUN: %clang_cc1 %s -verify -fsyntax-only -triple arm-none-linux
+class Foo {
+  void bar();
+  static void bar2();
+  unsigned v;
+  static unsigned s;
+};
+
+void __attribute__((naked)) Foo::bar() { // expected-note{{attribute is here}}
+  asm("mov r2, %0" : : "r"(v)); // expected-error{{'this' pointer references not allowed in naked functions}}
+}
+
+void __attribute__((naked)) Foo::bar2() {
+  asm("mov r2, %0" : : "r"(s)); // static member reference is OK
+}
Index: cfe/trunk/include/clang/Basic/DiagnosticSemaKinds.td
===================================================================
--- cfe/trunk/include/clang/Basic/DiagnosticSemaKinds.td
+++ cfe/trunk/include/clang/Basic/DiagnosticSemaKinds.td
@@ -7211,6 +7211,8 @@
 
 def err_non_asm_stmt_in_naked_function : Error<
   "non-ASM statement in naked function is not supported">;
+def err_asm_naked_this_ref : Error<
+  "'this' pointer references not allowed in naked functions">;
 def err_asm_naked_parm_ref : Error<
   "parameter references not allowed in naked functions">;

EMAIL PREFERENCES
  http://reviews.llvm.org/settings/panel/emailpreferences/
-------------- next part --------------
A non-text attachment was scrubbed...
Name: D7329.19272.patch
Type: text/x-patch
Size: 2201 bytes
Desc: not available
URL: <http://lists.llvm.org/pipermail/cfe-commits/attachments/20150203/fb9dbc80/attachment.bin>