[PATCH] D75768: Add a warning for builtin_return_address/frame_address with > 0 argument

[Erich Keane via Phabricator via cfe-commits]

This revision was automatically updated to reflect the committed changes.
Closed by commit rG843a9778fcd5: Add a warning for builtin_return_address/frame_address with > 0 argument (authored by jstenglein, committed by erichkeane).

Changed prior to commit:
  https://reviews.llvm.org/D75768?vs=248809&id=249161#toc

Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D75768/new/

https://reviews.llvm.org/D75768

Files:
  clang/include/clang/Basic/DiagnosticGroups.td
  clang/include/clang/Basic/DiagnosticSemaKinds.td
  clang/lib/Sema/SemaChecking.cpp
  clang/test/Misc/warning-wall.c


Index: clang/test/Misc/warning-wall.c
===================================================================
--- clang/test/Misc/warning-wall.c
+++ clang/test/Misc/warning-wall.c
@@ -16,6 +16,7 @@
 CHECK-NEXT:      -Wformat-y2k
 CHECK-NEXT:      -Wformat-invalid-specifier
 CHECK-NEXT:    -Wfor-loop-analysis
+CHECK-NEXT:    -Wframe-address
 CHECK-NEXT:    -Wimplicit
 CHECK-NEXT:      -Wimplicit-function-declaration
 CHECK-NEXT:      -Wimplicit-int
Index: clang/lib/Sema/SemaChecking.cpp
===================================================================
--- clang/lib/Sema/SemaChecking.cpp
+++ clang/lib/Sema/SemaChecking.cpp
@@ -1853,6 +1853,17 @@
   case Builtin::BI__builtin_return_address:
     if (SemaBuiltinConstantArgRange(TheCall, 0, 0, 0xFFFF))
       return ExprError();
+
+    // -Wframe-address warning if non-zero passed to builtin
+    // return/frame address.
+    Expr::EvalResult Result;
+    if (TheCall->getArg(0)->EvaluateAsInt(Result, getASTContext()) &&
+        Result.Val.getInt() != 0)
+      Diag(TheCall->getBeginLoc(), diag::warn_frame_address)
+          << ((BuiltinID == Builtin::BI__builtin_return_address)
+                  ? "__builtin_return_address"
+                  : "__builtin_frame_address")
+          << TheCall->getSourceRange();
     break;
   }
 
Index: clang/include/clang/Basic/DiagnosticSemaKinds.td
===================================================================
--- clang/include/clang/Basic/DiagnosticSemaKinds.td
+++ clang/include/clang/Basic/DiagnosticSemaKinds.td
@@ -1780,6 +1780,11 @@
 def err_illegal_union_or_anon_struct_member : Error<
   "%select{anonymous struct|union}0 member %1 has a non-trivial "
   "%sub{select_special_member_kind}2">;
+
+def warn_frame_address : Warning<
+  "calling '%0' with a nonzero argument is unsafe">,
+  InGroup<FrameAddress>, DefaultIgnore;
+
 def warn_cxx98_compat_nontrivial_union_or_anon_struct_member : Warning<
   "%select{anonymous struct|union}0 member %1 with a non-trivial "
   "%sub{select_special_member_kind}2 is incompatible with C++98">,
Index: clang/include/clang/Basic/DiagnosticGroups.td
===================================================================
--- clang/include/clang/Basic/DiagnosticGroups.td
+++ clang/include/clang/Basic/DiagnosticGroups.td
@@ -99,6 +99,7 @@
   DiagGroup<"float-conversion", [FloatOverflowConversion,
                                  FloatZeroConversion]>;
 
+def FrameAddress : DiagGroup<"frame-address">;
 def DoublePromotion : DiagGroup<"double-promotion">;
 def EnumTooLarge : DiagGroup<"enum-too-large">;
 def UnsupportedNan : DiagGroup<"unsupported-nan">;
@@ -872,6 +873,7 @@
     DeleteNonVirtualDtor,
     Format,
     ForLoopAnalysis,
+    FrameAddress,
     Implicit,
     InfiniteRecursion,
     IntInBoolContext,


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