Add -fno-sanitize-address-use-after-scope flag

Reviewers: eugenis

Differential Revision: https://reviews.llvm.org/D25453

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@283801 91177308-0d34-0410-b5e6-96231b3b80d8

include/clang/Driver/Options.td

@@ -687,6 +687,9 @@ def fsanitize_address_field_padding : Joined<["-"], "fsanitize-address-field-pad
 def fsanitize_address_use_after_scope : Flag<["-"], "fsanitize-address-use-after-scope">,
                                         Group<f_clang_Group>, Flags<[CC1Option]>,
                                         HelpText<"Enable use-after-scope detection in AddressSanitizer">;
+def fno_sanitize_address_use_after_scope : Flag<["-"], "fno-sanitize-address-use-after-scope">,
+                                           Group<f_clang_Group>, Flags<[CC1Option]>,
+                                           HelpText<"Disable use-after-scope detection in AddressSanitizer">;
 def fsanitize_recover : Flag<["-"], "fsanitize-recover">, Group<f_clang_Group>,
                         Flags<[CoreOption]>;
 def fno_sanitize_recover : Flag<["-"], "fno-sanitize-recover">,

lib/Driver/SanitizerArgs.cpp

@@ -559,14 +559,13 @@ SanitizerArgs::SanitizerArgs(const ToolChain &TC,
         D.Diag(clang::diag::note_drv_address_sanitizer_debug_runtime);
       }
     }
-  }
 
-  AsanUseAfterScope =
-      Args.hasArg(options::OPT_fsanitize_address_use_after_scope);
-  if (AsanUseAfterScope && !(AllAddedKinds & Address)) {
-    D.Diag(clang::diag::err_drv_argument_only_allowed_with)
-        << "-fsanitize-address-use-after-scope"
-        << "-fsanitize=address";
+    if (Arg *A = Args.getLastArg(
+            options::OPT_fsanitize_address_use_after_scope,
+            options::OPT_fno_sanitize_address_use_after_scope)) {
+      AsanUseAfterScope = A->getOption().getID() ==
+                          options::OPT_fsanitize_address_use_after_scope;
+    }
   }
 
   // Parse -link-cxx-sanitizer flag.

lib/Frontend/CompilerInvocation.cpp

@@ -732,8 +732,11 @@ static bool ParseCodeGenArgs(CodeGenOptions &Opts, ArgList &Args, InputKind IK,
       Args.hasArg(OPT_fsanitize_memory_use_after_dtor);
   Opts.SanitizeCfiCrossDso = Args.hasArg(OPT_fsanitize_cfi_cross_dso);
   Opts.SanitizeStats = Args.hasArg(OPT_fsanitize_stats);
-  Opts.SanitizeAddressUseAfterScope =
-      Args.hasArg(OPT_fsanitize_address_use_after_scope);
+  if (Arg *A = Args.getLastArg(OPT_fsanitize_address_use_after_scope,
+                               OPT_fno_sanitize_address_use_after_scope)) {
+    Opts.SanitizeAddressUseAfterScope =
+        A->getOption().getID() == OPT_fsanitize_address_use_after_scope;
+  }
   Opts.SSPBufferSize =
       getLastArgIntValue(Args, OPT_stack_protector_buffer_size, 8, Diags);
   Opts.StackRealignment = Args.hasArg(OPT_mstackrealign);

test/Driver/fsanitize.c

@@ -108,14 +108,20 @@
 // RUN: %clang -target x86_64-linux-gnu -fsanitize=efficiency-working-set,kernel-address -pie -fno-rtti %s -### 2>&1 | FileCheck %s --check-prefix=CHECK-SANE-SANKA
 // CHECK-SANE-SANKA: '-fsanitize=efficiency-{{.*}}' not allowed with '-fsanitize=kernel-address'
 
-// RUN: %clang -target x86_64-linux-gnu -fsanitize-address-use-after-scope %s -### 2>&1 | FileCheck %s --check-prefix=CHECK-ONLY-USE-AFTER-SCOPE
-// CHECK-ONLY-USE-AFTER-SCOPE: '-fsanitize-address-use-after-scope' only allowed with '-fsanitize=address'
-
 // RUN: %clang -target x86_64-linux-gnu -fsanitize=address -fsanitize-address-use-after-scope %s -### 2>&1 | FileCheck %s --check-prefix=CHECK-USE-AFTER-SCOPE
 // CHECK-USE-AFTER-SCOPE: -cc1{{.*}}-fsanitize-address-use-after-scope
 
-// RUN: %clang -target x86_64-linux-gnu -fsanitize=address %s -### 2>&1 | FileCheck %s --check-prefix=CHECK-ASAN-NO-USE-AFTER-SCOPE
-// CHECK-ASAN-NO-USE-AFTER-SCOPE-NOT: -cc1{{.*}}-fsanitize-address-use-after-scope
+// RUN: %clang -target x86_64-linux-gnu -fsanitize=address -fno-sanitize-address-use-after-scope %s -### 2>&1 | FileCheck %s --check-prefix=CHECK-USE-AFTER-SCOPE-OFF
+// CHECK-USE-AFTER-SCOPE-OFF-NOT: -cc1{{.*}}address-use-after-scope
+
+// RUN: %clang -target x86_64-linux-gnu -fsanitize=address -fno-sanitize-address-use-after-scope -fsanitize-address-use-after-scope %s -### 2>&1 | FileCheck %s --check-prefix=CHECK-USE-AFTER-SCOPE-BOTH
+// CHECK-USE-AFTER-SCOPE-BOTH: -cc1{{.*}}-fsanitize-address-use-after-scope
+
+// RUN: %clang -target x86_64-linux-gnu -fsanitize=address -fsanitize-address-use-after-scope -fno-sanitize-address-use-after-scope %s -### 2>&1 | FileCheck %s --check-prefix=CHECK-USE-AFTER-SCOPE-BOTH-OFF
+// CHECK-USE-AFTER-SCOPE-BOTH-OFF-NOT: -cc1{{.*}}address-use-after-scope
+
+// RUN: %clang -target x86_64-linux-gnu -fsanitize=address %s -### 2>&1 | FileCheck %s --check-prefix=CHECK-ASAN-WITHOUT-USE-AFTER-SCOPE
+// CHECK-ASAN-WITHOUT-USE-AFTER-SCOPE-NOT: -cc1{{.*}}address-use-after-scope
 
 // RUN: %clang -target x86_64-linux-gnu -fsanitize-memory-track-origins -pie %s -### 2>&1 | FileCheck %s --check-prefix=CHECK-ONLY-TRACK-ORIGINS
 // CHECK-ONLY-TRACK-ORIGINS: warning: argument unused during compilation: '-fsanitize-memory-track-origins'