[clang] 843a977 - Add a warning for builtin_return_address/frame_address with > 0 argument
Erich Keane via cfe-commits
cfe-commits at lists.llvm.org
Mon Mar 9 10:43:26 PDT 2020
Author: Jeremy Stenglein
Date: 2020-03-09T10:43:09-07:00
New Revision: 843a9778fcd5ef93804fc22de04af9ab8c8b20a9
URL: https://github.com/llvm/llvm-project/commit/843a9778fcd5ef93804fc22de04af9ab8c8b20a9
DIFF: https://github.com/llvm/llvm-project/commit/843a9778fcd5ef93804fc22de04af9ab8c8b20a9.diff
LOG: Add a warning for builtin_return_address/frame_address with > 0 argument
Clang is missing a warning for
builtin_return_address/builtin_frame_address called with > 0 argument.
Gcc provides a warning for this via -Wframe-address:
https://gcc.gnu.org/onlinedocs/gcc/Return-Address.html
As calling these functions with argument > 0 has caused several crashes
for us, we would like to have the same warning as gcc here. This diff
adds the warning and makes it part of -Wmost.
Differential Revision: https://reviews.llvm.org/D75768
Added:
Modified:
clang/include/clang/Basic/DiagnosticGroups.td
clang/include/clang/Basic/DiagnosticSemaKinds.td
clang/lib/Sema/SemaChecking.cpp
clang/test/Misc/warning-wall.c
Removed:
################################################################################
diff --git a/clang/include/clang/Basic/DiagnosticGroups.td b/clang/include/clang/Basic/DiagnosticGroups.td
index ae3f882dd910..2b11298bfcfa 100644
--- a/clang/include/clang/Basic/DiagnosticGroups.td
+++ b/clang/include/clang/Basic/DiagnosticGroups.td
@@ -99,6 +99,7 @@ def FloatConversion :
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 @@ def Most : DiagGroup<"most", [
DeleteNonVirtualDtor,
Format,
ForLoopAnalysis,
+ FrameAddress,
Implicit,
InfiniteRecursion,
IntInBoolContext,
diff --git a/clang/include/clang/Basic/DiagnosticSemaKinds.td b/clang/include/clang/Basic/DiagnosticSemaKinds.td
index b0338c44cca9..6c73917e2eac 100644
--- a/clang/include/clang/Basic/DiagnosticSemaKinds.td
+++ b/clang/include/clang/Basic/DiagnosticSemaKinds.td
@@ -1780,6 +1780,11 @@ def note_due_to_dllexported_class : Note<
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">,
diff --git a/clang/lib/Sema/SemaChecking.cpp b/clang/lib/Sema/SemaChecking.cpp
index 106e90f4c44c..2e73fcac93e1 100644
--- a/clang/lib/Sema/SemaChecking.cpp
+++ b/clang/lib/Sema/SemaChecking.cpp
@@ -1853,6 +1853,17 @@ Sema::CheckBuiltinFunctionCall(FunctionDecl *FDecl, unsigned BuiltinID,
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;
}
diff --git a/clang/test/Misc/warning-wall.c b/clang/test/Misc/warning-wall.c
index 737ed76859c4..d0a0172dff5f 100644
--- a/clang/test/Misc/warning-wall.c
+++ b/clang/test/Misc/warning-wall.c
@@ -16,6 +16,7 @@ CHECK-NEXT: -Wformat-security
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
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